1455 lines
115 KiB
Text
1455 lines
115 KiB
Text
<!DOCTYPE html>
|
||
<html lang="en" dir="ltr" prefix="content: http://purl.org/rss/1.0/modules/content/ dc: http://purl.org/dc/terms/ foaf: http://xmlns.com/foaf/0.1/ og: http://ogp.me/ns# rdfs: http://www.w3.org/2000/01/rdf-schema# schema: http://schema.org/ sioc: http://rdfs.org/sioc/ns# sioct: http://rdfs.org/sioc/types# skos: http://www.w3.org/2004/02/skos/core# xsd: http://www.w3.org/2001/XMLSchema# ">
|
||
<head>
|
||
<meta charset="utf-8" /><script type="text/javascript">(window.NREUM||(NREUM={})).init={ajax:{deny_list:["bam.nr-data.net"]}};(window.NREUM||(NREUM={})).loader_config={licenseKey:"37b7ccb661",applicationID:"1089704227"};;/*! For license information please see nr-loader-rum-1.283.2.min.js.LICENSE.txt */
|
||
(()=>{var e,t,r={122:(e,t,r)=>{"use strict";r.d(t,{a:()=>i});var n=r(944);function i(e,t){try{if(!e||"object"!=typeof e)return(0,n.R)(3);if(!t||"object"!=typeof t)return(0,n.R)(4);const r=Object.create(Object.getPrototypeOf(t),Object.getOwnPropertyDescriptors(t)),o=0===Object.keys(r).length?e:r;for(let a in o)if(void 0!==e[a])try{if(null===e[a]){r[a]=null;continue}Array.isArray(e[a])&&Array.isArray(t[a])?r[a]=Array.from(new Set([...e[a],...t[a]])):"object"==typeof e[a]&&"object"==typeof t[a]?r[a]=i(e[a],t[a]):r[a]=e[a]}catch(e){(0,n.R)(1,e)}return r}catch(e){(0,n.R)(2,e)}}},555:(e,t,r)=>{"use strict";r.d(t,{Vp:()=>c,fn:()=>s,x1:()=>u});var n=r(384),i=r(122);const o={beacon:n.NT.beacon,errorBeacon:n.NT.errorBeacon,licenseKey:void 0,applicationID:void 0,sa:void 0,queueTime:void 0,applicationTime:void 0,ttGuid:void 0,user:void 0,account:void 0,product:void 0,extra:void 0,jsAttributes:{},userAttributes:void 0,atts:void 0,transactionName:void 0,tNamePlain:void 0},a={};function s(e){try{const t=c(e);return!!t.licenseKey&&!!t.errorBeacon&&!!t.applicationID}catch(e){return!1}}function c(e){if(!e)throw new Error("All info objects require an agent identifier!");if(!a[e])throw new Error("Info for ".concat(e," was never set"));return a[e]}function u(e,t){if(!e)throw new Error("All info objects require an agent identifier!");a[e]=(0,i.a)(t,o);const r=(0,n.nY)(e);r&&(r.info=a[e])}},217:(e,t,r)=>{"use strict";r.d(t,{D0:()=>m,gD:()=>v,xN:()=>h});r(860).K7.genericEvents;const n="experimental.marks",i="experimental.measures",o="experimental.resources",a=e=>{if(!e||"string"!=typeof e)return!1;try{document.createDocumentFragment().querySelector(e)}catch{return!1}return!0};var s=r(614),c=r(944),u=r(384),l=r(122);const d="[data-nr-mask]",f=()=>{const e={feature_flags:[],experimental:{marks:!1,measures:!1,resources:!1},mask_selector:"*",block_selector:"[data-nr-block]",mask_input_options:{color:!1,date:!1,"datetime-local":!1,email:!1,month:!1,number:!1,range:!1,search:!1,tel:!1,text:!1,time:!1,url:!1,week:!1,textarea:!1,select:!1,password:!0}};return{ajax:{deny_list:void 0,block_internal:!0,enabled:!0,autoStart:!0},distributed_tracing:{enabled:void 0,exclude_newrelic_header:void 0,cors_use_newrelic_header:void 0,cors_use_tracecontext_headers:void 0,allowed_origins:void 0},get feature_flags(){return e.feature_flags},set feature_flags(t){e.feature_flags=t},generic_events:{enabled:!0,autoStart:!0},harvest:{interval:30},jserrors:{enabled:!0,autoStart:!0},logging:{enabled:!0,autoStart:!0},metrics:{enabled:!0,autoStart:!0},obfuscate:void 0,page_action:{enabled:!0},page_view_event:{enabled:!0,autoStart:!0},page_view_timing:{enabled:!0,autoStart:!0},performance:{get capture_marks(){return e.feature_flags.includes(n)||e.experimental.marks},set capture_marks(t){e.experimental.marks=t},get capture_measures(){return e.feature_flags.includes(i)||e.experimental.measures},set capture_measures(t){e.experimental.measures=t},capture_detail:!0,resources:{get enabled(){return e.feature_flags.includes(o)||e.experimental.resources},set enabled(t){e.experimental.resources=t},asset_types:[],first_party_domains:[],ignore_newrelic:!0}},privacy:{cookies_enabled:!0},proxy:{assets:void 0,beacon:void 0},session:{expiresMs:s.wk,inactiveMs:s.BB},session_replay:{autoStart:!0,enabled:!1,preload:!1,sampling_rate:10,error_sampling_rate:100,collect_fonts:!1,inline_images:!1,fix_stylesheets:!0,mask_all_inputs:!0,get mask_text_selector(){return e.mask_selector},set mask_text_selector(t){a(t)?e.mask_selector="".concat(t,",").concat(d):""===t||null===t?e.mask_selector=d:(0,c.R)(5,t)},get block_class(){return"nr-block"},get ignore_class(){return"nr-ignore"},get mask_text_class(){return"nr-mask"},get block_selector(){return e.block_selector},set block_selector(t){a(t)?e.block_selector+=",".concat(t):""!==t&&(0,c.R)(6,t)},get mask_input_options(){return e.mask_input_options},set mask_input_options(t){t&&"object"==typeof t?e.mask_input_options={...t,password:!0}:(0,c.R)(7,t)}},session_trace:{enabled:!0,autoStart:!0},soft_navigations:{enabled:!0,autoStart:!0},spa:{enabled:!0,autoStart:!0},ssl:void 0,user_actions:{enabled:!0,elementAttributes:["id","className","tagName","type"]}}},g={},p="All configuration objects require an agent identifier!";function m(e){if(!e)throw new Error(p);if(!g[e])throw new Error("Configuration for ".concat(e," was never set"));return g[e]}function h(e,t){if(!e)throw new Error(p);g[e]=(0,l.a)(t,f());const r=(0,u.nY)(e);r&&(r.init=g[e])}function v(e,t){if(!e)throw new Error(p);var r=m(e);if(r){for(var n=t.split("."),i=0;i<n.length-1;i++)if("object"!=typeof(r=r[n[i]]))return;r=r[n[n.length-1]]}return r}},371:(e,t,r)=>{"use strict";r.d(t,{V:()=>f,f:()=>d});var n=r(122),i=r(384),o=r(154),a=r(324);let s=0;const c={buildEnv:a.F3,distMethod:a.Xs,version:a.xv,originTime:o.WN},u={customTransaction:void 0,disabled:!1,isolatedBacklog:!1,loaderType:void 0,maxBytes:3e4,onerror:void 0,ptid:void 0,releaseIds:{},appMetadata:{},session:void 0,denyList:void 0,timeKeeper:void 0,obfuscator:void 0,harvester:void 0},l={};function d(e){if(!e)throw new Error("All runtime objects require an agent identifier!");if(!l[e])throw new Error("Runtime for ".concat(e," was never set"));return l[e]}function f(e,t){if(!e)throw new Error("All runtime objects require an agent identifier!");l[e]={...(0,n.a)(t,u),...c},Object.hasOwnProperty.call(l[e],"harvestCount")||Object.defineProperty(l[e],"harvestCount",{get:()=>++s});const r=(0,i.nY)(e);r&&(r.runtime=l[e])}},324:(e,t,r)=>{"use strict";r.d(t,{F3:()=>i,Xs:()=>o,xv:()=>n});const n="1.283.2",i="PROD",o="CDN"},154:(e,t,r)=>{"use strict";r.d(t,{OF:()=>c,RI:()=>i,WN:()=>l,bv:()=>o,gm:()=>a,mw:()=>s,sb:()=>u});var n=r(863);const i="undefined"!=typeof window&&!!window.document,o="undefined"!=typeof WorkerGlobalScope&&("undefined"!=typeof self&&self instanceof WorkerGlobalScope&&self.navigator instanceof WorkerNavigator||"undefined"!=typeof globalThis&&globalThis instanceof WorkerGlobalScope&&globalThis.navigator instanceof WorkerNavigator),a=i?window:"undefined"!=typeof WorkerGlobalScope&&("undefined"!=typeof self&&self instanceof WorkerGlobalScope&&self||"undefined"!=typeof globalThis&&globalThis instanceof WorkerGlobalScope&&globalThis),s=Boolean("hidden"===a?.document?.visibilityState),c=/iPad|iPhone|iPod/.test(a.navigator?.userAgent),u=c&&"undefined"==typeof SharedWorker,l=((()=>{const e=a.navigator?.userAgent?.match(/Firefox[/\s](\d+\.\d+)/);Array.isArray(e)&&e.length>=2&&e[1]})(),Date.now()-(0,n.t)())},687:(e,t,r)=>{"use strict";r.d(t,{Ak:()=>c,Ze:()=>d,x3:()=>u});var n=r(836),i=r(606),o=r(860),a=r(646);const s={};function c(e,t){const r={staged:!1,priority:o.P3[t]||0};l(e),s[e].get(t)||s[e].set(t,r)}function u(e,t){e&&s[e]&&(s[e].get(t)&&s[e].delete(t),g(e,t,!1),s[e].size&&f(e))}function l(e){if(!e)throw new Error("agentIdentifier required");s[e]||(s[e]=new Map)}function d(e="",t="feature",r=!1){if(l(e),!e||!s[e].get(t)||r)return g(e,t);s[e].get(t).staged=!0,f(e)}function f(e){const t=Array.from(s[e]);t.every((([e,t])=>t.staged))&&(t.sort(((e,t)=>e[1].priority-t[1].priority)),t.forEach((([t])=>{s[e].delete(t),g(e,t)})))}function g(e,t,r=!0){const o=e?n.ee.get(e):n.ee,s=i.i.handlers;if(!o.aborted&&o.backlog&&s){if(r){const e=o.backlog[t],r=s[t];if(r){for(let t=0;e&&t<e.length;++t)p(e[t],r);Object.entries(r).forEach((([e,t])=>{Object.values(t||{}).forEach((t=>{t[0]?.on&&t[0]?.context()instanceof a.y&&t[0].on(e,t[1])}))}))}}o.isolatedBacklog||delete s[t],o.backlog[t]=null,o.emit("drain-"+t,[])}}function p(e,t){var r=e[1];Object.values(t[r]||{}).forEach((t=>{var r=e[0];if(t[0]===r){var n=t[1],i=e[3],o=e[2];n.apply(i,o)}}))}},836:(e,t,r)=>{"use strict";r.d(t,{P:()=>c,ee:()=>u});var n=r(384),i=r(990),o=r(371),a=r(646),s=r(607);const c="nr@context:".concat(s.W),u=function e(t,r){var n={},s={},l={},d=!1;try{d=16===r.length&&(0,o.f)(r).isolatedBacklog}catch(e){}var f={on:p,addEventListener:p,removeEventListener:function(e,t){var r=n[e];if(!r)return;for(var i=0;i<r.length;i++)r[i]===t&&r.splice(i,1)},emit:function(e,r,n,i,o){!1!==o&&(o=!0);if(u.aborted&&!i)return;t&&o&&t.emit(e,r,n);for(var a=g(n),c=m(e),l=c.length,d=0;d<l;d++)c[d].apply(a,r);var p=v()[s[e]];p&&p.push([f,e,r,a]);return a},get:h,listeners:m,context:g,buffer:function(e,t){const r=v();if(t=t||"feature",f.aborted)return;Object.entries(e||{}).forEach((([e,n])=>{s[n]=t,t in r||(r[t]=[])}))},abort:function(){f._aborted=!0,Object.keys(f.backlog).forEach((e=>{delete f.backlog[e]}))},isBuffering:function(e){return!!v()[s[e]]},debugId:r,backlog:d?{}:t&&"object"==typeof t.backlog?t.backlog:{},isolatedBacklog:d};return Object.defineProperty(f,"aborted",{get:()=>{let e=f._aborted||!1;return e||(t&&(e=t.aborted),e)}}),f;function g(e){return e&&e instanceof a.y?e:e?(0,i.I)(e,c,(()=>new a.y(c))):new a.y(c)}function p(e,t){n[e]=m(e).concat(t)}function m(e){return n[e]||[]}function h(t){return l[t]=l[t]||e(f,t)}function v(){return f.backlog}}(void 0,"globalEE"),l=(0,n.Zm)();l.ee||(l.ee=u)},646:(e,t,r)=>{"use strict";r.d(t,{y:()=>n});class n{constructor(e){this.contextId=e}}},908:(e,t,r)=>{"use strict";r.d(t,{d:()=>n,p:()=>i});var n=r(836).ee.get("handle");function i(e,t,r,i,o){o?(o.buffer([e],i),o.emit(e,t,r)):(n.buffer([e],i),n.emit(e,t,r))}},606:(e,t,r)=>{"use strict";r.d(t,{i:()=>o});var n=r(908);o.on=a;var i=o.handlers={};function o(e,t,r,o){a(o||n.d,i,e,t,r)}function a(e,t,r,i,o){o||(o="feature"),e||(e=n.d);var a=t[o]=t[o]||{};(a[r]=a[r]||[]).push([e,i])}},878:(e,t,r)=>{"use strict";function n(e,t){return{capture:e,passive:!1,signal:t}}function i(e,t,r=!1,i){window.addEventListener(e,t,n(r,i))}function o(e,t,r=!1,i){document.addEventListener(e,t,n(r,i))}r.d(t,{DD:()=>o,jT:()=>n,sp:()=>i})},607:(e,t,r)=>{"use strict";r.d(t,{W:()=>n});const n=(0,r(566).bz)()},566:(e,t,r)=>{"use strict";r.d(t,{LA:()=>s,bz:()=>a});var n=r(154);const i="xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx";function o(e,t){return e?15&e[t]:16*Math.random()|0}function a(){const e=n.gm?.crypto||n.gm?.msCrypto;let t,r=0;return e&&e.getRandomValues&&(t=e.getRandomValues(new Uint8Array(30))),i.split("").map((e=>"x"===e?o(t,r++).toString(16):"y"===e?(3&o()|8).toString(16):e)).join("")}function s(e){const t=n.gm?.crypto||n.gm?.msCrypto;let r,i=0;t&&t.getRandomValues&&(r=t.getRandomValues(new Uint8Array(e)));const a=[];for(var s=0;s<e;s++)a.push(o(r,i++).toString(16));return a.join("")}},614:(e,t,r)=>{"use strict";r.d(t,{BB:()=>a,H3:()=>n,g:()=>u,iL:()=>c,tS:()=>s,uh:()=>i,wk:()=>o});const n="NRBA",i="SESSION",o=144e5,a=18e5,s={STARTED:"session-started",PAUSE:"session-pause",RESET:"session-reset",RESUME:"session-resume",UPDATE:"session-update"},c={SAME_TAB:"same-tab",CROSS_TAB:"cross-tab"},u={OFF:0,FULL:1,ERROR:2}},863:(e,t,r)=>{"use strict";function n(){return Math.floor(performance.now())}r.d(t,{t:()=>n})},944:(e,t,r)=>{"use strict";function n(e,t){"function"==typeof console.debug&&console.debug("New Relic Warning: https://github.com/newrelic/newrelic-browser-agent/blob/main/docs/warning-codes.md#".concat(e),t)}r.d(t,{R:()=>n})},284:(e,t,r)=>{"use strict";r.d(t,{t:()=>c,B:()=>s});var n=r(836),i=r(154);const o="newrelic";const a=new Set,s={};function c(e,t){const r=n.ee.get(t);s[t]??={},e&&"object"==typeof e&&(a.has(t)||(r.emit("rumresp",[e]),s[t]=e,a.add(t),function(e={}){try{i.gm.dispatchEvent(new CustomEvent(o,{detail:e}))}catch(e){}}({loaded:!0})))}},990:(e,t,r)=>{"use strict";r.d(t,{I:()=>i});var n=Object.prototype.hasOwnProperty;function i(e,t,r){if(n.call(e,t))return e[t];var i=r();if(Object.defineProperty&&Object.keys)try{return Object.defineProperty(e,t,{value:i,writable:!0,enumerable:!1}),i}catch(e){}return e[t]=i,i}},389:(e,t,r)=>{"use strict";function n(e,t=500,r={}){const n=r?.leading||!1;let i;return(...r)=>{n&&void 0===i&&(e.apply(this,r),i=setTimeout((()=>{i=clearTimeout(i)}),t)),n||(clearTimeout(i),i=setTimeout((()=>{e.apply(this,r)}),t))}}function i(e){let t=!1;return(...r)=>{t||(t=!0,e.apply(this,r))}}r.d(t,{J:()=>i,s:()=>n})},289:(e,t,r)=>{"use strict";r.d(t,{GG:()=>o,sB:()=>a});var n=r(878);function i(){return"undefined"==typeof document||"complete"===document.readyState}function o(e,t){if(i())return e();(0,n.sp)("load",e,t)}function a(e){if(i())return e();(0,n.DD)("DOMContentLoaded",e)}},384:(e,t,r)=>{"use strict";r.d(t,{NT:()=>o,US:()=>l,Zm:()=>a,bQ:()=>c,dV:()=>s,nY:()=>u,pV:()=>d});var n=r(154),i=r(863);const o={beacon:"bam.nr-data.net",errorBeacon:"bam.nr-data.net"};function a(){return n.gm.NREUM||(n.gm.NREUM={}),void 0===n.gm.newrelic&&(n.gm.newrelic=n.gm.NREUM),n.gm.NREUM}function s(){let e=a();return e.o||(e.o={ST:n.gm.setTimeout,SI:n.gm.setImmediate,CT:n.gm.clearTimeout,XHR:n.gm.XMLHttpRequest,REQ:n.gm.Request,EV:n.gm.Event,PR:n.gm.Promise,MO:n.gm.MutationObserver,FETCH:n.gm.fetch,WS:n.gm.WebSocket}),e}function c(e,t){let r=a();r.initializedAgents??={},t.initializedAt={ms:(0,i.t)(),date:new Date},r.initializedAgents[e]=t}function u(e){let t=a();return t.initializedAgents?.[e]}function l(e,t){a()[e]=t}function d(){return function(){let e=a();const t=e.info||{};e.info={beacon:o.beacon,errorBeacon:o.errorBeacon,...t}}(),function(){let e=a();const t=e.init||{};e.init={...t}}(),s(),function(){let e=a();const t=e.loader_config||{};e.loader_config={...t}}(),a()}},843:(e,t,r)=>{"use strict";r.d(t,{u:()=>i});var n=r(878);function i(e,t=!1,r,i){(0,n.DD)("visibilitychange",(function(){if(t)return void("hidden"===document.visibilityState&&e());e(document.visibilityState)}),r,i)}},434:(e,t,r)=>{"use strict";r.d(t,{Jt:()=>o,YM:()=>c});var n=r(836),i=r(607);const o="nr@original:".concat(i.W);var a=Object.prototype.hasOwnProperty,s=!1;function c(e,t){return e||(e=n.ee),r.inPlace=function(e,t,n,i,o){n||(n="");const a="-"===n.charAt(0);for(let s=0;s<t.length;s++){const c=t[s],u=e[c];l(u)||(e[c]=r(u,a?c+n:n,i,c,o))}},r.flag=o,r;function r(t,r,n,s,c){return l(t)?t:(r||(r=""),nrWrapper[o]=t,function(e,t,r){if(Object.defineProperty&&Object.keys)try{return Object.keys(e).forEach((function(r){Object.defineProperty(t,r,{get:function(){return e[r]},set:function(t){return e[r]=t,t}})})),t}catch(e){u([e],r)}for(var n in e)a.call(e,n)&&(t[n]=e[n])}(t,nrWrapper,e),nrWrapper);function nrWrapper(){var o,a,l,d;try{a=this,o=[...arguments],l="function"==typeof n?n(o,a):n||{}}catch(t){u([t,"",[o,a,s],l],e)}i(r+"start",[o,a,s],l,c);try{return d=t.apply(a,o)}catch(e){throw i(r+"err",[o,a,e],l,c),e}finally{i(r+"end",[o,a,d],l,c)}}}function i(r,n,i,o){if(!s||t){var a=s;s=!0;try{e.emit(r,n,i,t,o)}catch(t){u([t,r,n,i],e)}s=a}}}function u(e,t){t||(t=n.ee);try{t.emit("internal-error",e)}catch(e){}}function l(e){return!(e&&"function"==typeof e&&e.apply&&!e[o])}},993:(e,t,r)=>{"use strict";r.d(t,{A$:()=>o,ET:()=>a,p_:()=>i});var n=r(860);const i={ERROR:"ERROR",WARN:"WARN",INFO:"INFO",DEBUG:"DEBUG",TRACE:"TRACE"},o={OFF:0,ERROR:1,WARN:2,INFO:3,DEBUG:4,TRACE:5},a="log";n.K7.logging},773:(e,t,r)=>{"use strict";r.d(t,{z_:()=>o,XG:()=>s,TZ:()=>n,rs:()=>i,xV:()=>a});r(154),r(566),r(384);const n=r(860).K7.metrics,i="sm",o="cm",a="storeSupportabilityMetrics",s="storeEventMetrics"},630:(e,t,r)=>{"use strict";r.d(t,{T:()=>n});const n=r(860).K7.pageViewEvent},782:(e,t,r)=>{"use strict";r.d(t,{T:()=>n});const n=r(860).K7.pageViewTiming},344:(e,t,r)=>{"use strict";r.d(t,{G4:()=>i});var n=r(614);r(860).K7.sessionReplay;const i={RECORD:"recordReplay",PAUSE:"pauseReplay",REPLAY_RUNNING:"replayRunning",ERROR_DURING_REPLAY:"errorDuringReplay"};n.g.ERROR,n.g.FULL,n.g.OFF},234:(e,t,r)=>{"use strict";r.d(t,{W:()=>o});var n=r(836),i=r(687);class o{constructor(e,t){this.agentIdentifier=e,this.ee=n.ee.get(e),this.featureName=t,this.blocked=!1}deregisterDrain(){(0,i.x3)(this.agentIdentifier,this.featureName)}}},603:(e,t,r)=>{"use strict";r.d(t,{j:()=>K});var n=r(860),i=r(555),o=r(371),a=r(908),s=r(836),c=r(687),u=r(289),l=r(154),d=r(944),f=r(773),g=r(384),p=r(344);const m=["setErrorHandler","finished","addToTrace","addRelease","recordCustomEvent","addPageAction","setCurrentRouteName","setPageViewName","setCustomAttribute","interaction","noticeError","setUserId","setApplicationVersion","start",p.G4.RECORD,p.G4.PAUSE,"log","wrapLogger"],h=["setErrorHandler","finished","addToTrace","addRelease"];var v=r(863),b=r(614),y=r(993);var w=r(646),R=r(434);const A=new Map;function E(e,t,r,n){if("object"!=typeof t||!t||"string"!=typeof r||!r||"function"!=typeof t[r])return(0,d.R)(29);const i=function(e){return(e||s.ee).get("logger")}(e),o=(0,R.YM)(i),a=new w.y(s.P);a.level=n.level,a.customAttributes=n.customAttributes;const c=t[r]?.[R.Jt]||t[r];return A.set(c,a),o.inPlace(t,[r],"wrap-logger-",(()=>A.get(c))),i}function _(){const e=(0,g.pV)();m.forEach((t=>{e[t]=(...r)=>function(t,...r){let n=[];return Object.values(e.initializedAgents).forEach((e=>{e&&e.api?e.exposed&&e.api[t]&&n.push(e.api[t](...r)):(0,d.R)(38,t)})),n.length>1?n:n[0]}(t,...r)}))}const x={};function N(e,t,g=!1){t||(0,c.Ak)(e,"api");const m={};var w=s.ee.get(e),R=w.get("tracer");x[e]=b.g.OFF,w.on(p.G4.REPLAY_RUNNING,(t=>{x[e]=t}));var A="api-",_=A+"ixn-";function N(t,r,n,o){const a=(0,i.Vp)(e);return null===r?delete a.jsAttributes[t]:(0,i.x1)(e,{...a,jsAttributes:{...a.jsAttributes,[t]:r}}),j(A,n,!0,o||null===r?"session":void 0)(t,r)}function k(){}m.log=function(e,{customAttributes:t={},level:r=y.p_.INFO}={}){(0,a.p)(f.xV,["API/log/called"],void 0,n.K7.metrics,w),function(e,t,r={},i=y.p_.INFO){(0,a.p)(f.xV,["API/logging/".concat(i.toLowerCase(),"/called")],void 0,n.K7.metrics,e),(0,a.p)(y.ET,[(0,v.t)(),t,r,i],void 0,n.K7.logging,e)}(w,e,t,r)},m.wrapLogger=(e,t,{customAttributes:r={},level:i=y.p_.INFO}={})=>{(0,a.p)(f.xV,["API/wrapLogger/called"],void 0,n.K7.metrics,w),E(w,e,t,{customAttributes:r,level:i})},h.forEach((e=>{m[e]=j(A,e,!0,"api")})),m.addPageAction=j(A,"addPageAction",!0,n.K7.genericEvents),m.recordCustomEvent=j(A,"recordCustomEvent",!0,n.K7.genericEvents),m.setPageViewName=function(t,r){if("string"==typeof t)return"/"!==t.charAt(0)&&(t="/"+t),(0,o.f)(e).customTransaction=(r||"http://custom.transaction")+t,j(A,"setPageViewName",!0)()},m.setCustomAttribute=function(e,t,r=!1){if("string"==typeof e){if(["string","number","boolean"].includes(typeof t)||null===t)return N(e,t,"setCustomAttribute",r);(0,d.R)(40,typeof t)}else(0,d.R)(39,typeof e)},m.setUserId=function(e){if("string"==typeof e||null===e)return N("enduser.id",e,"setUserId",!0);(0,d.R)(41,typeof e)},m.setApplicationVersion=function(e){if("string"==typeof e||null===e)return N("application.version",e,"setApplicationVersion",!1);(0,d.R)(42,typeof e)},m.start=()=>{try{(0,a.p)(f.xV,["API/start/called"],void 0,n.K7.metrics,w),w.emit("manual-start-all")}catch(e){(0,d.R)(23,e)}},m[p.G4.RECORD]=function(){(0,a.p)(f.xV,["API/recordReplay/called"],void 0,n.K7.metrics,w),(0,a.p)(p.G4.RECORD,[],void 0,n.K7.sessionReplay,w)},m[p.G4.PAUSE]=function(){(0,a.p)(f.xV,["API/pauseReplay/called"],void 0,n.K7.metrics,w),(0,a.p)(p.G4.PAUSE,[],void 0,n.K7.sessionReplay,w)},m.interaction=function(e){return(new k).get("object"==typeof e?e:{})};const T=k.prototype={createTracer:function(e,t){var r={},i=this,o="function"==typeof t;return(0,a.p)(f.xV,["API/createTracer/called"],void 0,n.K7.metrics,w),g||(0,a.p)(_+"tracer",[(0,v.t)(),e,r],i,n.K7.spa,w),function(){if(R.emit((o?"":"no-")+"fn-start",[(0,v.t)(),i,o],r),o)try{return t.apply(this,arguments)}catch(e){const t="string"==typeof e?new Error(e):e;throw R.emit("fn-err",[arguments,this,t],r),t}finally{R.emit("fn-end",[(0,v.t)()],r)}}}};function j(e,t,r,i){return function(){return(0,a.p)(f.xV,["API/"+t+"/called"],void 0,n.K7.metrics,w),i&&(0,a.p)(e+t,[r?(0,v.t)():performance.now(),...arguments],r?null:this,i,w),r?void 0:this}}function I(){r.e(296).then(r.bind(r,778)).then((({setAPI:t})=>{t(e),(0,c.Ze)(e,"api")})).catch((e=>{(0,d.R)(27,e),w.abort()}))}return["actionText","setName","setAttribute","save","ignore","onEnd","getContext","end","get"].forEach((e=>{T[e]=j(_,e,void 0,g?n.K7.softNav:n.K7.spa)})),m.setCurrentRouteName=g?j(_,"routeName",void 0,n.K7.softNav):j(A,"routeName",!0,n.K7.spa),m.noticeError=function(t,r){"string"==typeof t&&(t=new Error(t)),(0,a.p)(f.xV,["API/noticeError/called"],void 0,n.K7.metrics,w),(0,a.p)("err",[t,(0,v.t)(),!1,r,!!x[e]],void 0,n.K7.jserrors,w)},l.RI?(0,u.GG)((()=>I()),!0):I(),m}var k=r(217),T=r(122);const j={accountID:void 0,trustKey:void 0,agentID:void 0,licenseKey:void 0,applicationID:void 0,xpid:void 0},I={};var O=r(284);const S=e=>{const t=e.startsWith("http");e+="/",r.p=t?e:"https://"+e};let P=!1;function K(e,t={},r,n){let{init:a,info:c,loader_config:u,runtime:d={},exposed:f=!0}=t;d.loaderType=r;const p=(0,g.pV)();c||(a=p.init,c=p.info,u=p.loader_config),(0,k.xN)(e.agentIdentifier,a||{}),function(e,t){if(!e)throw new Error("All loader-config objects require an agent identifier!");I[e]=(0,T.a)(t,j);const r=(0,g.nY)(e);r&&(r.loader_config=I[e])}(e.agentIdentifier,u||{}),c.jsAttributes??={},l.bv&&(c.jsAttributes.isWorker=!0),(0,i.x1)(e.agentIdentifier,c);const m=(0,k.D0)(e.agentIdentifier),h=[c.beacon,c.errorBeacon];P||(m.proxy.assets&&(S(m.proxy.assets),h.push(m.proxy.assets)),m.proxy.beacon&&h.push(m.proxy.beacon),_(),(0,g.US)("activatedFeatures",O.B),e.runSoftNavOverSpa&&=!0===m.soft_navigations.enabled&&m.feature_flags.includes("soft_nav")),d.denyList=[...m.ajax.deny_list||[],...m.ajax.block_internal?h:[]],d.ptid=e.agentIdentifier,(0,o.V)(e.agentIdentifier,d),e.ee=s.ee.get(e.agentIdentifier),void 0===e.api&&(e.api=N(e.agentIdentifier,n,e.runSoftNavOverSpa)),void 0===e.exposed&&(e.exposed=f),P=!0}},374:(e,t,r)=>{r.nc=(()=>{try{return document?.currentScript?.nonce}catch(e){}return""})()},860:(e,t,r)=>{"use strict";r.d(t,{$J:()=>u,K7:()=>s,P3:()=>c,XX:()=>i,qY:()=>n,v4:()=>a});const n="events",i="jserrors",o="browser/blobs",a="rum",s={ajax:"ajax",genericEvents:"generic_events",jserrors:i,logging:"logging",metrics:"metrics",pageAction:"page_action",pageViewEvent:"page_view_event",pageViewTiming:"page_view_timing",sessionReplay:"session_replay",sessionTrace:"session_trace",softNav:"soft_navigations",spa:"spa"},c={[s.pageViewEvent]:1,[s.pageViewTiming]:2,[s.metrics]:3,[s.jserrors]:4,[s.spa]:5,[s.ajax]:6,[s.sessionTrace]:7,[s.softNav]:8,[s.sessionReplay]:9,[s.logging]:10,[s.genericEvents]:11},u={[s.pageViewEvent]:a,[s.pageViewTiming]:n,[s.ajax]:n,[s.spa]:n,[s.softNav]:n,[s.metrics]:i,[s.jserrors]:i,[s.sessionTrace]:o,[s.sessionReplay]:o,[s.logging]:"browser/logs",[s.genericEvents]:"ins"}}},n={};function i(e){var t=n[e];if(void 0!==t)return t.exports;var o=n[e]={exports:{}};return r[e](o,o.exports,i),o.exports}i.m=r,i.d=(e,t)=>{for(var r in t)i.o(t,r)&&!i.o(e,r)&&Object.defineProperty(e,r,{enumerable:!0,get:t[r]})},i.f={},i.e=e=>Promise.all(Object.keys(i.f).reduce(((t,r)=>(i.f[r](e,t),t)),[])),i.u=e=>"nr-rum-1.283.2.min.js",i.o=(e,t)=>Object.prototype.hasOwnProperty.call(e,t),e={},t="NRBA-1.283.2.PROD:",i.l=(r,n,o,a)=>{if(e[r])e[r].push(n);else{var s,c;if(void 0!==o)for(var u=document.getElementsByTagName("script"),l=0;l<u.length;l++){var d=u[l];if(d.getAttribute("src")==r||d.getAttribute("data-webpack")==t+o){s=d;break}}if(!s){c=!0;var f={296:"sha512-2Y8GMAOGF658KnXzOZ/v+DlLch8TBFvV0tTNnOy9wrpvtDa1t5CdZMyX+LubTymBlzPp6NUjllBghMCZqXBPmg=="};(s=document.createElement("script")).charset="utf-8",s.timeout=120,i.nc&&s.setAttribute("nonce",i.nc),s.setAttribute("data-webpack",t+o),s.src=r,0!==s.src.indexOf(window.location.origin+"/")&&(s.crossOrigin="anonymous"),f[a]&&(s.integrity=f[a])}e[r]=[n];var g=(t,n)=>{s.onerror=s.onload=null,clearTimeout(p);var i=e[r];if(delete e[r],s.parentNode&&s.parentNode.removeChild(s),i&&i.forEach((e=>e(n))),t)return t(n)},p=setTimeout(g.bind(null,void 0,{type:"timeout",target:s}),12e4);s.onerror=g.bind(null,s.onerror),s.onload=g.bind(null,s.onload),c&&document.head.appendChild(s)}},i.r=e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},i.p="https://js-agent.newrelic.com/",(()=>{var e={374:0,840:0};i.f.j=(t,r)=>{var n=i.o(e,t)?e[t]:void 0;if(0!==n)if(n)r.push(n[2]);else{var o=new Promise(((r,i)=>n=e[t]=[r,i]));r.push(n[2]=o);var a=i.p+i.u(t),s=new Error;i.l(a,(r=>{if(i.o(e,t)&&(0!==(n=e[t])&&(e[t]=void 0),n)){var o=r&&("load"===r.type?"missing":r.type),a=r&&r.target&&r.target.src;s.message="Loading chunk "+t+" failed.\n("+o+": "+a+")",s.name="ChunkLoadError",s.type=o,s.request=a,n[1](s)}}),"chunk-"+t,t)}};var t=(t,r)=>{var n,o,[a,s,c]=r,u=0;if(a.some((t=>0!==e[t]))){for(n in s)i.o(s,n)&&(i.m[n]=s[n]);if(c)c(i)}for(t&&t(r);u<a.length;u++)o=a[u],i.o(e,o)&&e[o]&&e[o][0](),e[o]=0},r=self["webpackChunk:NRBA-1.283.2.PROD"]=self["webpackChunk:NRBA-1.283.2.PROD"]||[];r.forEach(t.bind(null,0)),r.push=t.bind(null,r.push.bind(r))})(),(()=>{"use strict";i(374);var e=i(944),t=i(344),r=i(566);class n{agentIdentifier;constructor(){this.agentIdentifier=(0,r.LA)(16)}#e(t,...r){if("function"==typeof this.api?.[t])return this.api[t](...r);(0,e.R)(35,t)}addPageAction(e,t){return this.#e("addPageAction",e,t)}recordCustomEvent(e,t){return this.#e("recordCustomEvent",e,t)}setPageViewName(e,t){return this.#e("setPageViewName",e,t)}setCustomAttribute(e,t,r){return this.#e("setCustomAttribute",e,t,r)}noticeError(e,t){return this.#e("noticeError",e,t)}setUserId(e){return this.#e("setUserId",e)}setApplicationVersion(e){return this.#e("setApplicationVersion",e)}setErrorHandler(e){return this.#e("setErrorHandler",e)}addRelease(e,t){return this.#e("addRelease",e,t)}log(e,t){return this.#e("log",e,t)}}class o extends n{#e(t,...r){if("function"==typeof this.api?.[t])return this.api[t](...r);(0,e.R)(35,t)}start(){return this.#e("start")}finished(e){return this.#e("finished",e)}recordReplay(){return this.#e(t.G4.RECORD)}pauseReplay(){return this.#e(t.G4.PAUSE)}addToTrace(e){return this.#e("addToTrace",e)}setCurrentRouteName(e){return this.#e("setCurrentRouteName",e)}interaction(){return this.#e("interaction")}wrapLogger(e,t,r){return this.#e("wrapLogger",e,t,r)}}var a=i(860),s=i(217);const c=Object.values(a.K7);function u(e){const t={};return c.forEach((r=>{t[r]=function(e,t){return!0===(0,s.gD)(t,"".concat(e,".enabled"))}(r,e)})),t}var l=i(603);var d=i(687),f=i(234),g=i(289),p=i(154),m=i(384);const h=e=>p.RI&&!0===(0,s.gD)(e,"privacy.cookies_enabled");function v(e){return!!(0,m.dV)().o.MO&&h(e)&&!0===(0,s.gD)(e,"session_trace.enabled")}var b=i(389);class y extends f.W{constructor(e,t,r=!0){super(e.agentIdentifier,t),this.auto=r,this.abortHandler=void 0,this.featAggregate=void 0,this.onAggregateImported=void 0,!1===e.init[this.featureName].autoStart&&(this.auto=!1),this.auto?(0,d.Ak)(e.agentIdentifier,t):this.ee.on("manual-start-all",(0,b.J)((()=>{(0,d.Ak)(e.agentIdentifier,this.featureName),this.auto=!0,this.importAggregator(e)})))}importAggregator(t,r={}){if(this.featAggregate||!this.auto)return;let n;this.onAggregateImported=new Promise((e=>{n=e}));const o=async()=>{let o;try{if(h(this.agentIdentifier)){const{setupAgentSession:e}=await i.e(296).then(i.bind(i,861));o=e(t)}}catch(t){(0,e.R)(20,t),this.ee.emit("internal-error",[t]),this.featureName===a.K7.sessionReplay&&this.abortHandler?.()}try{if(!this.#t(this.featureName,o))return(0,d.Ze)(this.agentIdentifier,this.featureName),void n(!1);const{lazyFeatureLoader:e}=await i.e(296).then(i.bind(i,103)),{Aggregate:a}=await e(this.featureName,"aggregate");this.featAggregate=new a(t,r),t.runtime.harvester.initializedAggregates.push(this.featAggregate),n(!0)}catch(t){(0,e.R)(34,t),this.abortHandler?.(),(0,d.Ze)(this.agentIdentifier,this.featureName,!0),n(!1),this.ee&&this.ee.abort()}};p.RI?(0,g.GG)((()=>o()),!0):o()}#t(e,t){switch(e){case a.K7.sessionReplay:return v(this.agentIdentifier)&&!!t;case a.K7.sessionTrace:return!!t;default:return!0}}}var w=i(630);class R extends y{static featureName=w.T;constructor(e,t=!0){super(e,w.T,t),this.importAggregator(e)}}var A=i(908),E=i(843),_=i(878),x=i(782),N=i(863);class k extends y{static featureName=x.T;constructor(e,t=!0){super(e,x.T,t),p.RI&&((0,E.u)((()=>(0,A.p)("docHidden",[(0,N.t)()],void 0,x.T,this.ee)),!0),(0,_.sp)("pagehide",(()=>(0,A.p)("winPagehide",[(0,N.t)()],void 0,x.T,this.ee))),this.importAggregator(e))}}var T=i(773);class j extends y{static featureName=T.TZ;constructor(e,t=!0){super(e,T.TZ,t),this.importAggregator(e)}}new class extends o{constructor(t){super(),p.gm?(this.features={},(0,m.bQ)(this.agentIdentifier,this),this.desiredFeatures=new Set(t.features||[]),this.desiredFeatures.add(R),this.runSoftNavOverSpa=[...this.desiredFeatures].some((e=>e.featureName===a.K7.softNav)),(0,l.j)(this,t,t.loaderType||"agent"),this.run()):(0,e.R)(21)}get config(){return{info:this.info,init:this.init,loader_config:this.loader_config,runtime:this.runtime}}run(){try{const t=u(this.agentIdentifier),r=[...this.desiredFeatures];r.sort(((e,t)=>a.P3[e.featureName]-a.P3[t.featureName])),r.forEach((r=>{if(!t[r.featureName]&&r.featureName!==a.K7.pageViewEvent)return;if(this.runSoftNavOverSpa&&r.featureName===a.K7.spa)return;if(!this.runSoftNavOverSpa&&r.featureName===a.K7.softNav)return;const n=function(e){switch(e){case a.K7.ajax:return[a.K7.jserrors];case a.K7.sessionTrace:return[a.K7.ajax,a.K7.pageViewEvent];case a.K7.sessionReplay:return[a.K7.sessionTrace];case a.K7.pageViewTiming:return[a.K7.pageViewEvent];default:return[]}}(r.featureName).filter((e=>!(e in this.features)));n.length>0&&(0,e.R)(36,{targetFeature:r.featureName,missingDependencies:n}),this.features[r.featureName]=new r(this)}))}catch(t){(0,e.R)(22,t);for(const e in this.features)this.features[e].abortHandler?.();const r=(0,m.Zm)();delete r.initializedAgents[this.agentIdentifier]?.api,delete r.initializedAgents[this.agentIdentifier]?.features,delete this.sharedAggregator;return r.ee.get(this.agentIdentifier).abort(),!1}}}({features:[R,k,j],loaderType:"lite"})})()})();</script>
|
||
<noscript><style>form.antibot * :not(.antibot-message) { display: none !important; }</style>
|
||
</noscript><script async src="https://www.googletagmanager.com/gtag/js?id=G-HEQ0YF2VYL"></script>
|
||
<script>window.dataLayer = window.dataLayer || [];function gtag(){dataLayer.push(arguments)};gtag("js", new Date());gtag("set", "developer_id.dMDhkMT", true);gtag('set', {'cookie_flags': 'SameSite=None;Secure', 'cookie_domain': 'www.nist.gov'});gtag("config", "G-HEQ0YF2VYL", {"groups":"default","page_placeholder":"PLACEHOLDER_page_location","link_attribution":true,"allow_ad_personalization_signals":false});gtag("config", "G-CSLL4ZEK4L", {"groups":"default","page_placeholder":"PLACEHOLDER_page_location","link_attribution":true,"allow_ad_personalization_signals":false});gtag("event", "custom", {"node_title":"Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket ","node_id":"1841561","blog_author":"Adam Creuziger","content_type":"Blog entry"});</script>
|
||
<meta name="description" content="Like many people, I had dreams of flying into space as an astronaut when I was a child. That interest in aerospace and space exploration has continued throughout my life" />
|
||
<link rel="canonical" href="https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part" />
|
||
<link rel="shortlink" href="https://www.nist.gov/node/1841561" />
|
||
<meta name="citation_title" content="Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket | NIST" />
|
||
<meta property="og:site_name" content="NIST" />
|
||
<meta property="og:type" content="Article" />
|
||
<meta property="og:url" content="https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part" />
|
||
<meta property="og:title" content="Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket" />
|
||
<meta property="og:description" content="Like many people, I had dreams of flying into space as an astronaut when I was a child. That interest in aerospace and space exploration has continued throughout my life" />
|
||
<meta property="og:image" content="https://www.nist.gov/sites/default/files/styles/social/public/images/2024/03/05/restored_apollo_f1_engine_piece_012524.png?itok=I-epuNNt" />
|
||
<meta property="og:image" content="https://www.nist.gov/themes/custom/nist_www/img/homepage/nist_mark.png" />
|
||
<meta property="og:image:width" content="780" />
|
||
<meta property="og:image:height" content="618" />
|
||
<meta property="og:image:alt" content="Close-up shows shiny metal patches with areas of green corrosion and open holes." />
|
||
<meta property="article:author" content="Adam Creuziger" />
|
||
<meta property="article:tag" content="Apollo" />
|
||
<meta property="article:published_time" content="2024-03-13T08:00-04:00" />
|
||
<meta property="article:modified_time" content="2025-01-31T13:56-05:00" />
|
||
<meta name="dcterms.title" content="Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket" />
|
||
<meta name="dcterms.creator" content="Adam Creuziger" />
|
||
<meta name="dcterms.description" content="Like many people, I had dreams of flying into space as an astronaut when I was a child. That interest in aerospace and space exploration has continued throughout my life" />
|
||
<meta name="dcterms.publisher" content="Adam Creuziger" />
|
||
<meta name="dcterms.contributor" content="NIST" />
|
||
<meta name="dcterms.date" content="2024-03-13T08:00-04:00" />
|
||
<meta name="dcterms.type" content="text" />
|
||
<meta name="dcterms.format" content="text/html" />
|
||
<meta name="dcterms.identifier" content="https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part" />
|
||
<meta name="dcterms.source" content="NIST" />
|
||
<meta name="dcterms.created" content="2024-03-13T08:00-04:00" />
|
||
<meta name="dcterms.modified" content="2025-01-31T13:56-05:00" />
|
||
<meta name="twitter:card" content="summary_large_image" />
|
||
<meta name="twitter:description" content="Like many people, I had dreams of flying into space as an astronaut when I was a child. That interest in aerospace and space exploration has continued throughout my life" />
|
||
<meta name="twitter:site" content="NIST" />
|
||
<meta name="twitter:title" content="Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket" />
|
||
<meta name="google-site-verification" content="QMu0ODkER3rN5hLcMLqNVf7e3bkjYsNLTuhqfH48jCA" />
|
||
<meta name="Generator" content="Drupal 10 (https://www.drupal.org)" />
|
||
<meta name="MobileOptimized" content="width" />
|
||
<meta name="HandheldFriendly" content="true" />
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
|
||
<meta name="nist_search_modified" class="elastic" content="2025-01-31T13:56:00-05:00" />
|
||
<script type="application/ld+json">{
|
||
"@context": "https://schema.org",
|
||
"@graph": [
|
||
{
|
||
"@type": "Article",
|
||
"@id": "https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part",
|
||
"headline": "Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket",
|
||
"name": "Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket",
|
||
"description": "Like many people, I had dreams of flying into space as an astronaut when I was a child. That interest in aerospace and space exploration has continued throughout my life.",
|
||
"image": {
|
||
"@type": "ImageObject",
|
||
"url": "https://www.nist.gov/sites/default/files/styles/social/public/images/2024/03/05/restored_apollo_f1_engine_piece_012524.png?itok=I-epuNNt",
|
||
"width": "780",
|
||
"height": "618"
|
||
},
|
||
"datePublished": "2024-03-13T08:00-04:00",
|
||
"dateModified": "2025-01-31T13:56-05:00",
|
||
"author": {
|
||
"@type": "Person",
|
||
"@id": "https://www.nist.gov/blogs/taking-measure/authors/adam-creuziger",
|
||
"name": "Adam Creuziger",
|
||
"url": "https://www.nist.gov/blogs/taking-measure/authors/adam-creuziger"
|
||
},
|
||
"publisher": {
|
||
"@type": "GovernmentOrganization",
|
||
"@id": "https://www.nist.gov/",
|
||
"name": "National Institute of Standards and Technology",
|
||
"url": "https://www.nist.gov/"
|
||
}
|
||
}
|
||
]
|
||
}</script>
|
||
<meta name="nist_search_bundle" class="elastic" content="blog" />
|
||
<link rel="icon" href="/themes/custom/nist_www/favicon.ico" type="image/vnd.microsoft.icon" />
|
||
|
||
<title>Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket | NIST</title>
|
||
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_hKAD9a0878O1Pdb6alKtCmESLiUtQmrBX15rQUvSgOA.css?delta=0&language=en&theme=nist_www&include=eJxNTgsOwyAIvZCpRzKotCNFaYTW9fazW5ctIYRH3i9CWoPJmM3H3x0oSXWV1II9sOD4CUdooUj2mRQiY2Cqq9NTDcvQKr75fmGJwB9t7_2L8WkX3-e2b8DTDd1B2NW_9zS8d75dCiyVZkpuJjZsPsFmNCqpJAIOBTPBFToYDKfsFkarJAe200vFJH8NCqUmSoYvWkVdRQ" />
|
||
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_kGS0ApDpFo-_3JI4Ijxg4RCWlTqsImK3lqH7bCv5v2U.css?delta=1&language=en&theme=nist_www&include=eJxNTgsOwyAIvZCpRzKotCNFaYTW9fazW5ctIYRH3i9CWoPJmM3H3x0oSXWV1II9sOD4CUdooUj2mRQiY2Cqq9NTDcvQKr75fmGJwB9t7_2L8WkX3-e2b8DTDd1B2NW_9zS8d75dCiyVZkpuJjZsPsFmNCqpJAIOBTPBFToYDKfsFkarJAe200vFJH8NCqUmSoYvWkVdRQ" />
|
||
<link rel="stylesheet" media="print" href="/sites/default/files/css/css_-IXwLuTUdm8IGHxib8GX8wWKw3LjKsNWSYYskZ5fEGg.css?delta=2&language=en&theme=nist_www&include=eJxNTgsOwyAIvZCpRzKotCNFaYTW9fazW5ctIYRH3i9CWoPJmM3H3x0oSXWV1II9sOD4CUdooUj2mRQiY2Cqq9NTDcvQKr75fmGJwB9t7_2L8WkX3-e2b8DTDd1B2NW_9zS8d75dCiyVZkpuJjZsPsFmNCqpJAIOBTPBFToYDKfsFkarJAe200vFJH8NCqUmSoYvWkVdRQ" />
|
||
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_RS8YGnRq2Xi5aD-GQC3GKwBe6bOWBBmEmXrb2xB5FMM.css?delta=3&language=en&theme=nist_www&include=eJxNTgsOwyAIvZCpRzKotCNFaYTW9fazW5ctIYRH3i9CWoPJmM3H3x0oSXWV1II9sOD4CUdooUj2mRQiY2Cqq9NTDcvQKr75fmGJwB9t7_2L8WkX3-e2b8DTDd1B2NW_9zS8d75dCiyVZkpuJjZsPsFmNCqpJAIOBTPBFToYDKfsFkarJAe200vFJH8NCqUmSoYvWkVdRQ" />
|
||
|
||
<script src="/sites/default/files/js/js_GM8kl6wk698qKTTwusj83bCoGHHtOZ1UinjY1sE_Qbk.js?scope=header&delta=0&language=en&theme=nist_www&include=eJxdjdEOwiAMRX9o2E9qyqhYBboAE_17YW7RLOGBc3p7a2l-YNX-FrC_P97L5FV9YKRE4V1lLnAWU5JS8SrdOW0pKDmsuZdI8uDpOy5SWeKS9clwFuPK5uqNI_e7GixljOrASSHbi4Okx5YBH9RSMPsK3Jgc5wOxtfaX4Fcdi-DyulC47DjNGiOneugdjX2bp3Dj_G2O5JNcZZ6GLHhf44I9t8LGZrAZ_AFBzXxL"></script>
|
||
|
||
</head>
|
||
<body class="node-1841561">
|
||
<a href="#main-content" class="visually-hidden focusable" data-elastic-exclude>
|
||
Skip to main content
|
||
</a>
|
||
|
||
<div class="dialog-off-canvas-main-canvas" data-off-canvas-main-canvas>
|
||
|
||
<!-- nist-index-ignore-start -->
|
||
<section data-elastic-exclude class="usa-banner" aria-label="Official government website">
|
||
<div class="usa-accordion">
|
||
<header class="usa-banner__header">
|
||
<div class="usa-banner__inner">
|
||
<div class="grid-col-auto">
|
||
<img class="usa-banner__header-flag" src="/libraries/nist-component-library/dist/img/us_flag_small.png" alt="U.S. flag">
|
||
</div>
|
||
<div class="grid-col-fill tablet:grid-col-auto">
|
||
<p class="usa-banner__header-text">An official website of the United States government</p>
|
||
<p class="usa-banner__header-action" aria-hidden="true">Here’s how you know</p>
|
||
</div>
|
||
<button class="usa-accordion__button usa-banner__button" aria-expanded="false" aria-controls="gov-banner-default">
|
||
<span class="usa-banner__button-text">Here’s how you know</span>
|
||
</button>
|
||
</div>
|
||
</header>
|
||
<div class="usa-banner__content usa-accordion__content" id="gov-banner-default">
|
||
<div class="grid-row grid-gap-lg">
|
||
<div class="usa-banner__guidance tablet:grid-col-6">
|
||
<img class="usa-banner__icon usa-media-block__img" src="/libraries/nist-component-library/dist/img/icon-dot-gov.svg" role="img" alt="" aria-hidden="true">
|
||
<div class="usa-media-block__body">
|
||
<p>
|
||
<strong>Official websites use .gov</strong>
|
||
<br/>
|
||
A <strong>.gov</strong> website belongs to an official government organization in the United States.
|
||
</p>
|
||
</div>
|
||
</div>
|
||
<div class="usa-banner__guidance tablet:grid-col-6">
|
||
<img class="usa-banner__icon usa-media-block__img" src="/libraries/nist-component-library/dist/img/icon-https.svg" role="img" alt="" aria-hidden="true">
|
||
<div class="usa-media-block__body">
|
||
<p>
|
||
<strong>Secure .gov websites use HTTPS</strong>
|
||
<br/>
|
||
A <strong>lock</strong> ( <span class="icon-lock">
|
||
<svg xmlns="http://www.w3.org/2000/svg" width="52" height="64" viewbox="0 0 52 64" class="usa-banner__lock-image" role="img" aria-labelledby="banner-lock-title banner-lock-description" focusable="false">
|
||
<title id="banner-lock-title">Lock</title>
|
||
<desc id="banner-lock-description">A locked padlock</desc><path fill="#000000" fill-rule="evenodd" d="M26 0c10.493 0 19 8.507 19 19v9h3a4 4 0 0 1 4 4v28a4 4 0 0 1-4 4H4a4 4 0 0 1-4-4V32a4 4 0 0 1 4-4h3v-9C7 8.507 15.507 0 26 0zm0 8c-5.979 0-10.843 4.77-10.996 10.712L15 19v9h22v-9c0-6.075-4.925-11-11-11z"/></svg>
|
||
</span>
|
||
) or <strong>https://</strong> means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
|
||
</p>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</section>
|
||
<!-- nist-index-ignore-end -->
|
||
|
||
|
||
<div data-elastic-exclude>
|
||
<!-- nist-index-ignore-start -->
|
||
<div class="nist-print-header" style="display:none;">
|
||
<p class="nist-print-header__url">https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part</p>
|
||
<img class="nist-print-header__logo" width="289" height="38" src="/libraries/nist-component-library/dist/img/logo/nist_logo_sidestack.svg" alt="National Institute of Standards and Technology" />
|
||
</div>
|
||
|
||
|
||
<div class="usa-overlay"></div>
|
||
<header class="usa-header nist-header--www nist-header--minimal" role="banner">
|
||
<div class="usa-navbar">
|
||
<div class="usa-logo flex-fill">
|
||
<a href="/" title="National Institute of Standards and Technology" aria-label="Home">
|
||
<img src="/libraries/nist-component-library/dist/img/logo/logo.svg" alt="National Institute of Standards and Technology" width="300px" height="80px" />
|
||
</a>
|
||
</div>
|
||
<div class="usa-header__right grid-row flex-auto">
|
||
<div class="grid-col-fill nist-header__search-group">
|
||
|
||
<form class="usa-search usa-search--small"
|
||
accept-charset="UTF-8"
|
||
action="/search"
|
||
id="search_form"
|
||
method="get">
|
||
<div role="search">
|
||
<label class="usa-sr-only" for="search-form">Search NIST</label>
|
||
<input class="usa-input" id="search-form" type="search" name="s" placeholder="Search NIST" required="" maxlength="128">
|
||
<button class="usa-button" type="submit"><img src="/libraries/nist-component-library/dist/img/usa-icons-bg/search--white.svg" class="usa-search__submit-icon" alt="Search"></button>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
<div class="grid-col-auto padding-left-1">
|
||
<button class="usa-menu-btn">Menu</button>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<nav aria-label="Primary navigation" class="usa-nav">
|
||
<div class="usa-nav__inner">
|
||
<button class="usa-nav__close">Close</button>
|
||
<ul class="usa-nav__primary usa-accordion">
|
||
<li class="usa-nav__primary-item">
|
||
<a class="usa-nav__link" href="/publications">Publications</a>
|
||
</li>
|
||
<li class="usa-nav__primary-item">
|
||
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-2"><span>What We Do</span></button>
|
||
<div id="primary_menu-2" class="usa-nav__submenu usa-megamenu">
|
||
<div class="grid-row">
|
||
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/topics" class="usa-nav__link">All Topics</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/advanced-communications" class="usa-nav__link">Advanced communications</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/artificial-intelligence" class="usa-nav__link">Artificial intelligence</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/bioscience" class="usa-nav__link">Bioscience</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/buildings-construction" class="usa-nav__link">Buildings and construction</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/chemistry" class="usa-nav__link">Chemistry</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/cybersecurity" class="usa-nav__link">Cybersecurity</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/electronics" class="usa-nav__link">Electronics</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/energy" class="usa-nav__link">Energy</a>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/environment" class="usa-nav__link">Environment</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/fire" class="usa-nav__link">Fire</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/forensic-science" class="usa-nav__link">Forensic science</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/health" class="usa-nav__link">Health</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/information-technology" class="usa-nav__link">Information technology</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/infrastructure" class="usa-nav__link">Infrastructure</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/manufacturing" class="usa-nav__link">Manufacturing</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/materials" class="usa-nav__link">Materials</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/mathematics-statistics" class="usa-nav__link">Mathematics and statistics</a>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/metrology" class="usa-nav__link">Metrology</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/nanotechnology" class="usa-nav__link">Nanotechnology</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/neutron-research" class="usa-nav__link">Neutron research</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/performance-excellence" class="usa-nav__link">Performance excellence</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/physics" class="usa-nav__link">Physics</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/public-safety" class="usa-nav__link">Public safety</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/quantum-information-science" class="usa-nav__link">Quantum information science</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/resilience" class="usa-nav__link">Resilience</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/standards" class="usa-nav__link">Standards</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/transportation" class="usa-nav__link">Transportation</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
<li class="usa-nav__primary-item">
|
||
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-3"><span>Labs & Major Programs</span></button>
|
||
<div id="primary_menu-3" class="usa-nav__submenu usa-megamenu">
|
||
<div class="grid-row">
|
||
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/adlp" class="usa-nav__link">Assoc Director of Laboratory Programs</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/laboratories" class="usa-nav__link">Laboratories</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="/ctl" class="usa-nav__link">Communications Technology Laboratory</a>
|
||
</li>
|
||
<li>
|
||
<a href="/el" class="usa-nav__link">Engineering Laboratory</a>
|
||
</li>
|
||
<li>
|
||
<a href="/itl" class="usa-nav__link">Information Technology Laboratory</a>
|
||
</li>
|
||
<li>
|
||
<a href="/mml" class="usa-nav__link">Material Measurement Laboratory</a>
|
||
</li>
|
||
<li>
|
||
<a href="/pml" class="usa-nav__link">Physical Measurement Laboratory</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/user-facilities" class="usa-nav__link">User Facilities</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="/ncnr" class="usa-nav__link">NIST Center for Neutron Research</a>
|
||
</li>
|
||
<li>
|
||
<a href="/cnst" class="usa-nav__link">CNST NanoFab</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/labs-major-programs/research-test-beds" class="usa-nav__link">Research Test Beds</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/laboratories/projects-programs" class="usa-nav__link">Research Projects</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/laboratories/tools-instruments" class="usa-nav__link">Tools & Instruments</a>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/major-programs" class="usa-nav__link">Major Programs</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="/baldrige" class="usa-nav__link">Baldrige Performance Excellence Program</a>
|
||
</li>
|
||
<li>
|
||
<a href="/chips" class="usa-nav__link">CHIPS for America Initiative</a>
|
||
</li>
|
||
<li>
|
||
<a href="/mep" class="usa-nav__link">Manufacturing Extension Partnership (MEP)</a>
|
||
</li>
|
||
<li>
|
||
<a href="/oam" class="usa-nav__link">Office of Advanced Manufacturing</a>
|
||
</li>
|
||
<li>
|
||
<a href="/spo" class="usa-nav__link">Special Programs Office</a>
|
||
</li>
|
||
<li>
|
||
<a href="/tpo" class="usa-nav__link">Technology Partnerships Office</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
<li class="usa-nav__primary-item">
|
||
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-4"><span>Services & Resources</span></button>
|
||
<div id="primary_menu-4" class="usa-nav__submenu usa-megamenu">
|
||
<div class="grid-row">
|
||
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/content/standards-measurements" class="usa-nav__link">Standards and Measurements</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="/calibrations" class="usa-nav__link">Calibration Services</a>
|
||
</li>
|
||
<li>
|
||
<a href="/nvlap" class="usa-nav__link">Laboratory Accreditation (NVLAP)</a>
|
||
</li>
|
||
<li>
|
||
<a href="/nist-quality-system" class="usa-nav__link">Quality System</a>
|
||
</li>
|
||
<li>
|
||
<a href="/srm" class="usa-nav__link">Standard Reference Materials (SRMs)</a>
|
||
</li>
|
||
<li>
|
||
<a href="/sri" class="usa-nav__link">Standard Reference Instruments (SRIs)</a>
|
||
</li>
|
||
<li>
|
||
<a href="/standardsgov" class="usa-nav__link">Standards.gov</a>
|
||
</li>
|
||
<li>
|
||
<a href="/pml/time-and-frequency-division/time-services" class="usa-nav__link">Time Services</a>
|
||
</li>
|
||
<li>
|
||
<a href="/pml/owm" class="usa-nav__link">Office of Weights and Measures</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/services-resources/software" class="usa-nav__link">Software</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/data" class="usa-nav__link">Data</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="https://webbook.nist.gov/chemistry/" class="usa-nav__link">Chemistry WebBook</a>
|
||
</li>
|
||
<li>
|
||
<a href="https://nvd.nist.gov/" class="usa-nav__link">National Vulnerability Database</a>
|
||
</li>
|
||
<li>
|
||
<a href="/pml/productsservices/physical-reference-data" class="usa-nav__link">Physical Reference Data</a>
|
||
</li>
|
||
<li>
|
||
<a href="/srd" class="usa-nav__link">Standard Reference Data (SRD)</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="https://shop.nist.gov/" class="usa-nav__link">Storefront</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/tpo" class="usa-nav__link">License & Patents</a>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="https://csrc.nist.gov/" class="usa-nav__link">Computer Security Resource Center (CSRC)</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/nist-research-library" class="usa-nav__link">NIST Research Library</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
<li class="usa-nav__primary-item">
|
||
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-5"><span>News & Events</span></button>
|
||
<div id="primary_menu-5" class="usa-nav__submenu usa-megamenu">
|
||
<div class="grid-row">
|
||
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/news-events/news" class="usa-nav__link">News</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/news-events/events" class="usa-nav__link">Events</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/blogs" class="usa-nav__link">Blogs</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/feature-stories" class="usa-nav__link">Feature Stories</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/awards" class="usa-nav__link">Awards</a>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/video-gallery" class="usa-nav__link">Video Gallery</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/image-gallery" class="usa-nav__link">Image Gallery</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/pao/media-contacts" class="usa-nav__link">Media Contacts</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
<li class="usa-nav__primary-item">
|
||
<button class="usa-accordion__button usa-nav__link" aria-expanded="false" aria-controls="primary_menu-6"><span>About NIST</span></button>
|
||
<div id="primary_menu-6" class="usa-nav__submenu usa-megamenu">
|
||
<div class="grid-row">
|
||
<div class="tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/about-nist" class="usa-nav__link">About Us</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="/director/leadership" class="usa-nav__link">Leadership</a>
|
||
</li>
|
||
<li>
|
||
<a href="/director/nist-organization-structure" class="usa-nav__link">Organization Structure</a>
|
||
</li>
|
||
<li>
|
||
<a href="/about-nist/budget-planning" class="usa-nav__link">Budget & Planning</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/about-nist/contact-us" class="usa-nav__link">Contact Us</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/about-nist/visit" class="usa-nav__link">Visit</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/careers" class="usa-nav__link">Careers</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="/iaao/academic-affairs-office" class="usa-nav__link">Student programs</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
</ul></div><div class="column-break tablet:grid-col-fill"><ul class="usa-nav__submenu-list">
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/about-nist/work-nist" class="usa-nav__link">Work with NIST</a>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/history" class="usa-nav__link">History</a>
|
||
<ul class="usa-nav__submenu-list">
|
||
<li>
|
||
<a href="http://nistdigitalarchives.contentdm.oclc.org/" class="usa-nav__link">NIST Digital Archives</a>
|
||
</li>
|
||
<li>
|
||
<a href="/nist-museum" class="usa-nav__link">NIST Museum</a>
|
||
</li>
|
||
<li>
|
||
<a href="/nist-and-nobel" class="usa-nav__link">NIST and the Nobel</a>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
<li class="usa-nav__submenu-item">
|
||
<a href="/education" class="usa-nav__link">Educational Resources</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</nav>
|
||
|
||
|
||
|
||
|
||
</header>
|
||
<!-- nist-index-ignore-end -->
|
||
</div>
|
||
|
||
<div class="grid-container">
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
<div
|
||
id="block-nist-www-content" class="nist-block"
|
||
>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<section
|
||
class="nist-page__content usa-section clearfix"
|
||
>
|
||
|
||
<a id="main-content" tabindex="-1"></a>
|
||
|
||
<div
|
||
class="nist-page__region nist-page__region--content-top-full"
|
||
>
|
||
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
|
||
<div class="entity-reference">
|
||
|
||
<div class="nist-blog-header nist-blog-header--purple nist-blog-header--inner">
|
||
<div class="nist-blog-header__bkgrd">
|
||
<div class="nist-blog-header__main grid-container">
|
||
<div class="grid-row">
|
||
<h2 class="nist-blog-header__title">
|
||
<a href="/blogs/taking-measure"> Taking Measure
|
||
</a>
|
||
</h2>
|
||
<div class="nist-blog-header__tagline">
|
||
<p class="text">Just a Standard Blog</p>
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<div class="grid-container margin-top-4">
|
||
<div
|
||
class="nist-page__region nist-page__region--content-top"
|
||
>
|
||
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
|
||
<h1 class="nist-page__title">Houston, We Have the Engine Remnants: How My Lab Pieced Together a Forgotten Part of an Apollo Rocket</h1>
|
||
|
||
|
||
</div>
|
||
|
||
<div
|
||
class="font-body-md"
|
||
>
|
||
|
||
|
||
|
||
<div class="daterange"><time datetime="2024-03-13T12:00:00Z">March 13, 2024</time>
|
||
</div>
|
||
|
||
</div>
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
|
||
|
||
<span>By: </span>
|
||
<a href="/blogs/taking-measure/authors/adam-creuziger" hreflang="en">Adam Creuziger</a>
|
||
|
||
</div>
|
||
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
|
||
<!-- nist-index-ignore-start -->
|
||
<div data-elastic-exclude class="nist-block nist-social__wrapper">
|
||
<h2 class="nist-social__title">Share</h2>
|
||
<div class="social-media-sharing">
|
||
<div class="nist-social__wrapper--share">
|
||
<div>
|
||
<a target="_blank" rel="noopener" href="https://www.facebook.com/share.php?u=https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part"
|
||
title="Facebook" class="nist-social nist-social--facebook-gray">
|
||
<span>Facebook</span>
|
||
</a>
|
||
</div>
|
||
<div>
|
||
<a target="_blank" rel="noopener" href="https://www.linkedin.com/shareArticle?mini=true&url=https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part&source=https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part"
|
||
title="Linkedin" class="nist-social nist-social--linkedin-gray">
|
||
<span>Linkedin</span>
|
||
</a>
|
||
</div>
|
||
<div>
|
||
<a target="_blank" rel="noopener" href="https://x.com/intent/tweet?url=https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part&status=https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part"
|
||
title="X.com" class="nist-social nist-social--x-gray">
|
||
<span>X.com</span>
|
||
</a>
|
||
</div>
|
||
<div>
|
||
<a href="mailto:?subject=NIST.gov&body=Check out this site https://www.nist.gov/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part"
|
||
title="Email" class="nist-social nist-social--envelope-gray">
|
||
<span>Email</span>
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<!-- nist-index-ignore-end -->
|
||
|
||
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="grid-container margin-top-4">
|
||
<div class="grid-row grid-gap-6">
|
||
|
||
|
||
|
||
<div
|
||
class="nist-page__region nist-page__region--content tablet-lg:grid-col-8"
|
||
>
|
||
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
|
||
<div class="text-with-summary">
|
||
|
||
|
||
|
||
|
||
<figure class=" align-right nist-image--lightbox nist-image" role="group">
|
||
<div data-copyright="Stock Photo" data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2024/03/05/nist_f1_engine_012424_air_and_space_museum.jpg?itok=ABpURlRj" data-media-id="702291">
|
||
|
||
<img alt="Close-up vertical photo shows a complex rocket engine with the circular opening pointed down." height="480" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2024/03/05/nist_f1_engine_012424_air_and_space_museum.jpg?itok=iJyuzgOf" typeof="foaf:Image" width="320">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
<figcaption class="nist-image__caption">NIST experts helped identify materials of the F-1 rocket engine that was used in the Apollo program — and had been resting on the Atlantic Ocean floor ever since.<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
NASA/National Air and Space Museum
|
||
|
||
</div></figcaption>
|
||
</figure>
|
||
|
||
<p>Like many people, I had dreams of flying into space as an astronaut when I was a child. That interest in aerospace and space exploration has continued throughout my life. </p><p>So when my colleague Tim Foecke, who was working at NIST at the time, invited me to assist with a research project involving the Apollo space program, I jumped at the chance. Tim has a long history in marine forensics and conservation.</p><p>Ten massive Saturn V rockets launched astronauts into space during the Apollo missions to the Moon. To reach the Moon, individual rocket pieces, known as stages, were discarded as they ran out of fuel. The first stages of the Saturn V rocket fell into the Atlantic Ocean and have been there since the 1960s and 1970s. </p><p>A decade ago, Bezos Expeditions recovered some of these artifacts from the ocean floor. Conservators worked for years to preserve these objects for study.</p><p>Many of these pieces are now on display in museums for the public to view and remember the Apollo program. Some of the most intact items were the <a href="https://airandspace.si.edu/collection-objects/rocket-engine-liquid-fuel-f-1/nasm_A19700271000">massive F-1 engines</a>. The conservators determined the artifacts came from Apollo 11, Apollo 13, Apollo 14 and Apollo 16 missions, based on where they were found and serial numbers still visible on some parts.</p><p>Tim and I initially worked with some of the conservators to help identify some of the materials used in the rocket engines. However, the conservators had significant challenges with one type of piece — the turbine blades. They found many blades were much lighter than they should be and were fragile to touch.</p><p>After being retrieved from its longtime resting place on the Atlantic Ocean floor, a turbine blade from the Saturn V’s rocket engine recently made its way to our lab in Gaithersburg, Maryland, for analysis.</p><p>I was initially quite puzzled by the mention of turbine blades. I knew they are commonly used in jet engines, but I initially struggled to figure out how they fit into rocket engines. Reading up on it more, I was astounded to find the turbines were part of a jet engine attached to each rocket, with the sole purpose of driving the fuel and oxygen into the rocket engine! </p><h2>The Story of the Saturn V Rocket and F-1 Engines</h2><p>The design for the F-1 rocket engine used in the Saturn V started in the 1950s. The designers imagined the largest capacity engine that might be used in the next decade. </p><p><a href="/how-do-you-measure-it/how-do-you-measure-thrust-rocket-engine" data-entity-type="node" data-entity-uuid="3f637914-b62b-464a-a81c-130ddf3ce9b8" data-entity-substitution="canonical" title="How Do You Measure the Thrust of a Rocket Engine?">Rocket thrust</a> is the force that determines if the rocket moves at all, what cargo or instruments the rocket can launch and how quickly the rocket will accelerate as it moves through the air. The designers settled on the round number of 1 million pounds of thrust (4.4 meganewtons) for this engine. </p>
|
||
<figure class=" align-center nist-image--lightbox nist-image" role="group">
|
||
<div data-copyright="Stock Photo" data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2019/08/01/f-1_engine_on_ocean_floor.jpg?itok=4R5xp_CG" data-media-id="373601">
|
||
|
||
<img alt="The Saturn V F-1 engine sitting on the ocean floor" height="641" loading="lazy" src="/sites/default/files/styles/960_x_960_limit/public/images/2019/08/01/f-1_engine_on_ocean_floor.jpg?itok=XoWGDXty" typeof="foaf:Image" width="960">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
<figcaption class="nist-image__caption">The thrust chamber of a Saturn V F-1 engine on the ocean floor, as seen where it sat for more than 40 years.<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
Bezos Expeditions
|
||
|
||
</div></figcaption>
|
||
</figure>
|
||
|
||
<p>At the time, most rocket engines produced about 120,000 pounds of thrust (530 kilonewtons). So, creating an engine with 10 times that amount of thrust might have seemed a bit absurd. But with the creation of NASA in 1958 and the subsequent space race throughout the 1960s, the idea wasn’t so far-fetched anymore. NASA realized the need for high-thrust engines capable of propelling astronauts all the way to the Moon and back. </p><p>By the time the Saturn V designs were finalized, the F-1 engines had been upgraded to 1.5 million pounds of thrust (6.6 meganewtons). The Saturn V used five of these engines for a combined thrust of 7.5 million pounds (33 meganewtons). </p><p>All that thrust was needed, as the Saturn V itself was <a href="https://www.kennedyspacecenter.com/explore-attractions/race-to-the-moon/featured-attraction/saturn-v-rocket#:~:text=At%20363%20feet%2F111%20meters,remaining%20in%20the%20United%20States.">taller than the Statue of Liberty</a> and weighed over 6 million pounds (2.7 million kilograms). The vast majority of the weight was a combination of kerosene, liquid hydrogen and liquid oxygen to feed the engines. The structure was largely a lightweight hollow tube to hold everything together. </p><h2>Studying the F-1 Engine Turbine Blade </h2><p>Each intact turbine blade is about the size of a soda can and looks like a twisted wing of a plane. The shape isn’t too surprising since it has a similar job to an airplane wing. In the case of a turbine, instead of generating lift like a plane wing, the blades create rotation to move fuel and oxygen where it needs to be. </p><p>We were initially sent one intact blade, but our studies were limited to observation and testing that wouldn’t damage the sample. Our preliminary analysis indicated it was likely a metallic alloy that can be used at high temperatures, known as a nickel-based superalloy. But this conclusion didn’t match any widely known alloys at the time. Additionally, since we could only examine the surface of the blade, we weren’t sure the surface measurements were the same as inside the blade.</p><p>After discussion of our findings, the conservators gave us four blade fragments that we could cut open and analyze what they looked like inside. It was apparent just by handling the fragments that they were not the solid metal they used to be; they were much too light. We placed the part in a vacuum chamber to support the internal structure and poured an epoxy mix over it. Then, we allowed air into the vacuum chamber, which pushed epoxy into many of the open spaces inside the blade. </p><p>When we looked inside, it was shocking how porous the blades were because the inside had corroded away. The outer surfaces were mostly intact, but the inside was now filled with epoxy, where metal used to be 40-plus years ago. The transparent epoxy supported the fragile metal pores while holding the green corroded metal remnants in place, like the clear ice on a pond that I saw in many winters in the Midwest. </p>
|
||
<figure class=" align-center nist-image--lightbox nist-image" role="group">
|
||
<div data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2024/03/05/restored_apollo_f1_engine_piece_012524.png?itok=yWwBPIGG" data-media-id="702296">
|
||
|
||
<img alt="Close-up shows shiny metal patches with areas of green corrosion and open holes. " height="618" loading="lazy" src="/sites/default/files/styles/960_x_960_limit/public/images/2024/03/05/restored_apollo_f1_engine_piece_012524.png?itok=HSjYhVHw" typeof="foaf:Image" width="780">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
<figcaption class="nist-image__caption">An up-close look at a piece of the <a href="https://data.nist.gov/od/ds/ark:/88434/mds2-2851/Sectioned-Microscope/image14.tif">F-1 engine</a> analyzed at NIST. Transparent epoxy supported the fragile metal holes in the material, while holding the green, corroded metal remnants in place during analysis.<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
A. Creuziger/NIST
|
||
|
||
</div></figcaption>
|
||
</figure>
|
||
|
||
<p>We then used a specialized microscope and other advanced equipment to simultaneously see what was being corroded and how the various elements were distributed throughout the blade. This allowed us to confirm that it was likely an alloy developed specifically for this mission. </p><p>As researchers, we didn’t have any background information on what materials were used in the engine. I imagine the company that built the engine decades ago only had to meet NASA’s requirements, and they may not have had to disclose exactly what materials were in it. It’s also possible those records have just been lost over the years. </p><p>One of the other mysteries in this project was that in the four turbine assemblies that were found, two of the turbine assemblies were found with their protective covering attached. The other two were found without the cover. </p><p>Contrary to expectations, the turbine blades with the protective covering intact were more badly corroded. Reading through other literature on corrosion, I learned this can often occur, where a stagnant environment inside the covering can cause more corrosion than material just exposed to the elements. </p><h2>What Our Research Means for Conservation </h2><p>The research provided some additional context in a few areas, including: </p><ul><li>what materials were used in the Saturn V engines,</li><li>what was causing the corrosion (and how to prevent it),</li><li>which materials or environments might be more susceptible to this type of corrosion for future conservators, and </li><li>ideas on how to support fragile samples like this in other applications. </li></ul><p>Also unique is that these engines were immersed in an environment (sitting for decades on the ocean floor) quite different from the one they were intended for (spinning rapidly in a flow of hot gas in a rocket engine). </p><p>There haven’t been a lot of conservation opportunities for things created so recently, so the results of this work were published as a paper in <a href="https://www.tandfonline.com/eprint/4MG4XYMHVI34QYANJ3NY/full?target=10.1080/00393630.2024.2303891"><em>Studies in Conservation</em></a><em>.</em></p><p>Another area where we’re hoping to make an impact is by applying conservation ideas to the data and metadata from our work, as well as the artifacts themselves. In addition to writing the paper, we’ve also prepared a <a href="https://data.nist.gov/od/id/mds2-2851">data publication</a> that includes additional images, data, methods and information about our work for future researchers to build upon the work. This project allowed me to use my knowledge and build upon the significant work the NIST staff has done to make data publicly available over the past decade. We hope the publication helps demonstrate some of what we’ve learned to a broader community. </p>
|
||
<figure class=" align-center nist-image--lightbox nist-image" role="group">
|
||
<div data-copyright="Stock Photo" data-lightbox="https://www.nist.gov/sites/default/files/styles/2800_x_2800_limit/public/images/2019/08/01/recovered_f-1_engine_sections_at_museum_of_flight.jpg?itok=UdVasFqE" data-media-id="373671">
|
||
|
||
<img alt="Photo of the recovered F-1 engine components that are on display at the Museum of Flight" height="640" loading="lazy" src="/sites/default/files/styles/960_x_960_limit/public/images/2019/08/01/recovered_f-1_engine_sections_at_museum_of_flight.jpg?itok=CP_6Dhd2" typeof="foaf:Image" width="960">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
<figcaption class="nist-image__caption">Recovered F-1 engine components on display at the Museum of Flight in Seattle.<div class="nist-image__credit">
|
||
<span class="nist-image__credit-label">Credit:</span>
|
||
|
||
Museum of Flight, Seattle
|
||
|
||
</div></figcaption>
|
||
</figure>
|
||
|
||
<p>The conservation of Apollo rocket parts may not seem to overlap much with my primary area of research, which includes developing new tests and standards to incorporate <a href="/lightweighting" data-entity-type="node" data-entity-uuid="cb0b7ae4-978d-44e6-a69e-1dbee81e8e88" data-entity-substitution="canonical" title="NIST Center for Automotive Lightweighting ">advanced, lighter-weight materials</a> into vehicles for energy and fuel efficiency. But one of the things I love about NIST is that we often get asked to do some fascinating and unusual things. Working at NIST has encouraged me to help people with their technical problems. I get a lot of gratification from solving the problem and then being able to share what we learn freely with the research community and the public. </p><p>It was quite an exciting opportunity for me as an aerospace engineer to be a small part of the history of the Apollo space exploration program. It was also neat to go with my family to the Smithsonian Air and Space Museum in Washington, D.C., to see some of the objects. During the video loop introducing the artifacts, the narrator thanked “materials scientists” who worked on the restoration. That was gratifying to hear. </p><p>I was born too late to be part of the Apollo program when the rockets were being launched, but it’s nice to be able to still contribute to a part of space exploration in my own way.</p><p><em>Author’s note: Adam Creuziger would like to thank co-authors Claudia Chemello, Paul Mardikian and Jerrad Alexander for allowing him to fulfill a childhood aspiration of being involved in the space program by supplying the various rocket parts to investigate, and Megan King for editorial assistance in drafting this article. Adam also acknowledges the substantial contributions to this project and paper from Dr. Tim Foecke prior to his retirement from NIST. </em></p>
|
||
|
||
</div>
|
||
|
||
</div>
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
|
||
|
||
<div class="nist-tags">
|
||
|
||
<a href="/blogs/taking-measure/categories/248946">Materials</a>,
|
||
<a href="/blogs/taking-measure/categories/248956">Composites</a>,
|
||
<a href="/blogs/taking-measure/categories/248966">Materials characterization</a>,
|
||
<a href="/blogs/taking-measure/categories/248971">Composition and structure</a>,
|
||
<a href="/blogs/taking-measure/categories/249396">Transportation</a> and
|
||
<a href="/blogs/taking-measure/categories/249401">Aerospace</a></div>
|
||
|
||
|
||
</div>
|
||
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
<h2
|
||
class="nist-block__title"
|
||
>About the author</h2>
|
||
|
||
<div class="nist-field nist-field--label-hidden entity-reference">
|
||
<div class="nist-field__items">
|
||
<div class="nist-field__item">
|
||
|
||
<article
|
||
about="/blogs/taking-measure/authors/adam-creuziger" class="nist-teaser"
|
||
>
|
||
<div class="nist-teaser__image">
|
||
<div class="entity-reference"> <a href="/blogs/taking-measure/authors/adam-creuziger" hreflang="en"><img loading="lazy" src="/sites/default/files/styles/thumbnail/public/images/annual_award/pecase20-20creuziger20adam0_0.jpg?itok=GLItjYQ4" width="81" height="100" alt="Creuziger" typeof="foaf:Image" />
|
||
|
||
</a>
|
||
</div>
|
||
|
||
</div>
|
||
<div class="nist-teaser__content-wrapper">
|
||
<header>
|
||
<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/authors/adam-creuziger"><span>Adam Creuziger</span>
|
||
</a></h3>
|
||
|
||
</header>
|
||
<div class="nist-teaser__content">
|
||
<div class="text-with-summary"><p><span>Adam Creuziger is a materials research engineer in the Materials Science and Engineering Division at NIST. He joined NIST as a National Research Council (NRC) research associate starting in 2008 and has been a staff member at NIST since 2012. In 2013, Adam was honored as a Presidential Early Career Award for Scientists and Engineers awardee. Before coming to NIST, Adam graduated with a bachelor of aerospace engineering and mechanics degree from the University of Minnesota and a master of science and Ph.D. in engineering mechanics from the University of Wisconsin-Madison.</span></p></div>
|
||
|
||
</div>
|
||
</div>
|
||
</article>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</div>
|
||
<div
|
||
class="views-element-container nist-block no-print"
|
||
>
|
||
|
||
<h2
|
||
class="nist-block__title"
|
||
>Related posts</h2>
|
||
|
||
<div><div class="js-view-dom-id-df22a6c6dd795833c68acf76b169bdd460dabc89be1484d08bbebccfefb129f3">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div>
|
||
|
||
<article
|
||
about="/blogs/taking-measure/curiosity-career-encouraging-students-pursue-stem-education" class="nist-teaser"
|
||
>
|
||
<div class="nist-teaser__image">
|
||
<div class="entity-reference"> <a href="/blogs/taking-measure/curiosity-career-encouraging-students-pursue-stem-education" hreflang="en"><img loading="lazy" src="/sites/default/files/styles/thumbnail/public/images/2023/12/18/trey_diulus_in_lab_december_2023.jpg?itok=GeyxQ2SP" width="100" height="67" alt="Trey Diulus poses sitting in the lab with a large, complex scientific instrument in the foreground." typeof="foaf:Image" />
|
||
|
||
</a>
|
||
</div>
|
||
|
||
</div>
|
||
<div class="nist-teaser__content-wrapper">
|
||
<header>
|
||
<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/curiosity-career-encouraging-students-pursue-stem-education"><span>Curiosity to Career: Encouraging Students to Pursue STEM Education</span>
|
||
</a></h3>
|
||
<div class="nist-teaser__date">
|
||
<div class="daterange"><time datetime="2024-09-18T12:00:00Z">September 18, 2024</time>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
</header>
|
||
<div class="nist-teaser__content">
|
||
<div class="text-with-summary"> A NIST researcher is volunteering to educate young students about life as a scientist — and encourage kids to envision a career for themselves in STEM.
|
||
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
</article>
|
||
</div>
|
||
<div>
|
||
|
||
<article
|
||
about="/blogs/taking-measure/sinking-our-teeth-science-how-biomedical-engineering-can-help-make-us-healthier" class="nist-teaser"
|
||
>
|
||
<div class="nist-teaser__image">
|
||
<div class="entity-reference"> <a href="/blogs/taking-measure/sinking-our-teeth-science-how-biomedical-engineering-can-help-make-us-healthier" hreflang="en"><img loading="lazy" src="/sites/default/files/styles/thumbnail/public/images/2024/08/21/robert_gutierrez_lab_fridge.jpg?itok=kNPxj4Pl" width="100" height="67" alt="A researcher wearing safety gear kneels at the open door of a lab fridge, displaying a tray of samples. " typeof="foaf:Image" />
|
||
|
||
</a>
|
||
</div>
|
||
|
||
</div>
|
||
<div class="nist-teaser__content-wrapper">
|
||
<header>
|
||
<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/sinking-our-teeth-science-how-biomedical-engineering-can-help-make-us-healthier"><span>Sinking Our Teeth Into Science: How Biomedical Engineering Can Help Make Us Healthier</span>
|
||
</a></h3>
|
||
<div class="nist-teaser__date">
|
||
<div class="daterange"><time datetime="2024-09-04T12:00:00Z">September 4, 2024</time>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
</header>
|
||
<div class="nist-teaser__content">
|
||
<div class="text-with-summary"> From safer dental products to tracking the movement of tiny plastics through gut tissues, regenerative medicine can make us healthier.
|
||
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
</article>
|
||
</div>
|
||
<div>
|
||
|
||
<article
|
||
about="/blogs/taking-measure/nist-researchers-measure-greenhouse-gases-during-solar-eclipse" class="nist-teaser"
|
||
>
|
||
<div class="nist-teaser__image">
|
||
<div class="entity-reference"> <a href="/blogs/taking-measure/nist-researchers-measure-greenhouse-gases-during-solar-eclipse" hreflang="en"><img loading="lazy" src="/sites/default/files/styles/thumbnail/public/images/2024/05/09/NIST_researchers_solar_eclipse%20%281%29.jpg?itok=MUO1yqfR" width="100" height="75" alt="Four people sitting outside on a green tarp wear eclipse glasses as they peer up into the sky. " typeof="foaf:Image" />
|
||
|
||
</a>
|
||
</div>
|
||
|
||
</div>
|
||
<div class="nist-teaser__content-wrapper">
|
||
<header>
|
||
<h3 class="nist-teaser__title"><a href="/blogs/taking-measure/nist-researchers-measure-greenhouse-gases-during-solar-eclipse"><span>NIST Researchers Measure Greenhouse Gases During the Solar Eclipse</span>
|
||
</a></h3>
|
||
<div class="nist-teaser__date">
|
||
<div class="daterange"><time datetime="2024-06-05T12:00:00Z">June 5, 2024</time>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
</header>
|
||
<div class="nist-teaser__content">
|
||
<div class="text-with-summary"> Check out some of the things happening at NIST during the past few months through the lens of social media.
|
||
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
</article>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
|
||
<div
|
||
class="nist-block no-print"
|
||
>
|
||
|
||
<h2
|
||
class="nist-block__title"
|
||
>Comments</h2>
|
||
|
||
<section>
|
||
|
||
|
||
|
||
|
||
<article data-comment-user-id="0" id="comment-142006" class="nist-comment js-comment">
|
||
|
||
|
||
<footer class="nist-comment__info">
|
||
<p class="submitted">
|
||
<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Nathaniel</span></span>
|
||
on
|
||
<span class="nist-comment__date">March 13, 2024 10:57 AM</span>
|
||
<mark class="hidden nist-comment__new" data-comment-timestamp="1710341918"></mark>
|
||
</p>
|
||
|
||
<div class="nist-comment__permalink"><a href="#comment-142006">Permalink</a></div>
|
||
|
||
</footer>
|
||
|
||
<div class="nist-comment__content">
|
||
<div class="text-long"><p>Great article! Thanks for doing your part to preserve history for future generations.</p>
|
||
</div>
|
||
|
||
<ul class="links inline nist-comment__links">
|
||
<li class="comment-reply nist-comment__link">
|
||
<a href="/comment/reply/node/1841561/comment_node_blog/142006">Reply</a></li></ul>
|
||
</div>
|
||
|
||
|
||
|
||
</article>
|
||
|
||
|
||
|
||
<article data-comment-user-id="0" id="comment-142291" class="nist-comment js-comment">
|
||
|
||
|
||
<footer class="nist-comment__info">
|
||
<p class="submitted">
|
||
<span class="nist-comment__author"><span lang="" typeof="schema:Person" property="schema:name" datatype="">Tyler</span></span>
|
||
on
|
||
<span class="nist-comment__date">March 14, 2024 9:16 AM</span>
|
||
<mark class="hidden nist-comment__new" data-comment-timestamp="1710423358"></mark>
|
||
</p>
|
||
|
||
<div class="nist-comment__permalink"><a href="#comment-142291">Permalink</a></div>
|
||
|
||
</footer>
|
||
|
||
<div class="nist-comment__content">
|
||
<div class="text-long"><p>What a wonderful article. Thanks for all the links and info.</p>
|
||
</div>
|
||
|
||
<ul class="links inline nist-comment__links">
|
||
<li class="comment-reply nist-comment__link">
|
||
<a href="/comment/reply/node/1841561/comment_node_blog/142291">Reply</a></li></ul>
|
||
</div>
|
||
|
||
|
||
|
||
</article>
|
||
|
||
|
||
<h2>Add new comment</h2>
|
||
<link rel="stylesheet" media="all" href="/sites/default/files/css/css_Lx5yvw0vUi4TN7C0L-5Rdrp4Q049mXEKn-dXREWOtBs.css?delta=0&language=en&theme=nist_www&include=eJxLzCvJTMov0U-E0Hpp-UW5OsmJBSXJGYn6SYnFqTppmTklqUX6KUWlBYk5ehAeAD47FNs&exclude=eJx1UAGOwyAM-xAdT0IBsi5bIBXQ9nqvv9B2WjXpJISwE-zEHsLLNdEzWf95u2c1_p8SBclmFBkZHWTgrVGo9pswmWpzd1IuyppZILpWVIbyaEc4ypUaUpqKLGi_iT7CzrUHJlRnYQ_FJYk2UgWvwkz5ZepWGyadsOLeb0cWD3x9D6eUfSBELG_o1nW9dl9wb8Gf1g1sLPMEfDuhCZIS5vamTzj4bVgIVyyHU4Ix052CWSiiOEweo6aBHC3D7zb0PIym07DYAFMjzbRKIGCXMBL0ffQ3wyZzc7pw0EjKZiVjEDbdqtr9vmkiM-NBueecJlXI81EcOh46_myYKBTpQf8BO5rHtg" />
|
||
<form class="comment-comment-node-blog-form comment-form usa-form antibot" novalidate="novalidate" data-drupal-selector="comment-form" data-action="/comment/reply/node/1841561/comment_node_blog" action="/antibot" method="post" id="comment-form" accept-charset="UTF-8">
|
||
<noscript>
|
||
<div class="antibot-no-js antibot-message antibot-message-warning">You must have JavaScript enabled to use this form.</div>
|
||
</noscript>
|
||
<div class="form-item js-form-item form-type-textfield js-form-type-textfield form-item-name js-form-item-name">
|
||
<label for="edit-name" class="usa-label">
|
||
Your name
|
||
</label>
|
||
|
||
|
||
<input data-drupal-default-value="Anonymous" data-drupal-selector="edit-name" type="text" id="edit-name" name="name" value="" size="30" maxlength="60" class="form-text usa-input" />
|
||
|
||
|
||
|
||
</div>
|
||
<input data-drupal-selector="form-qurtexxyudyvqgejea3jkh7a4fmuae5zi24vspwcrfg" type="hidden" name="form_build_id" value="form-quRTExXYUdYvQgEJEa3jkH7A4fmUAe5Zi24vSPWCrFg" class="usa-input" /><input data-drupal-selector="edit-comment-comment-node-blog-form" type="hidden" name="form_id" value="comment_comment_node_blog_form" class="usa-input" /><input data-drupal-selector="edit-antibot-key" type="hidden" name="antibot_key" value="" class="usa-input" /><div class="field--type-text-long field--name-comment-body field--widget-text-textarea js-form-wrapper form-wrapper" data-drupal-selector="edit-comment-body-wrapper" id="edit-comment-body-wrapper"> <div class="js-text-format-wrapper js-form-item form-item">
|
||
<div class="form-item js-form-item form-type-textarea js-form-type-textarea form-item-comment-body-0-value js-form-item-comment-body-0-value">
|
||
<label for="edit-comment-body-0-value" class="usa-label form-required">
|
||
Comment
|
||
<span class="usa-label--required"> <span class="usa-sr-only">Required</span>*</span></label>
|
||
|
||
|
||
<div class="form-textarea-wrapper">
|
||
<textarea class="js-text-full text-full form-textarea required usa-textarea resize-vertical" data-entity_embed-host-entity-langcode="en" data-media-embed-host-entity-langcode="en" data-drupal-selector="edit-comment-body-0-value" id="edit-comment-body-0-value" name="comment_body[0][value]" rows="5" cols="60" placeholder="" required="required" aria-required="true"></textarea>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
</div>
|
||
<div class="js-filter-wrapper filter-wrapper hidden js-form-wrapper form-wrapper" data-drupal-selector="edit-comment-body-0-format" id="edit-comment-body-0-format"><div class="js-filter-guidelines filter-guidelines js-form-wrapper form-wrapper" data-drupal-selector="edit-comment-body-0-format-guidelines" id="edit-comment-body-0-format-guidelines"><div data-drupal-format-id="plain_text">
|
||
<h4>Plain text</h4>
|
||
|
||
|
||
|
||
<ul>
|
||
<li>No HTML tags allowed.</li>
|
||
<li>Web page addresses and email addresses turn into links automatically.</li>
|
||
<li>Lines and paragraphs break automatically.</li>
|
||
</ul>
|
||
|
||
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
</div>
|
||
|
||
|
||
<fieldset data-drupal-selector="edit-captcha" class="captcha captcha-type-challenge--image">
|
||
<legend class="captcha__title js-form-required form-required">
|
||
CAPTCHA
|
||
</legend>
|
||
<div class="captcha__element">
|
||
<input data-drupal-selector="edit-captcha-sid" type="hidden" name="captcha_sid" value="652316831" class="usa-input" /><input data-drupal-selector="edit-captcha-token" type="hidden" name="captcha_token" value="6E-RsyzXYyNtChsj0ft3PyIgoApdEgB-d5KWcAffvvg" class="usa-input" /><div class="captcha__image-wrapper js-form-wrapper form-wrapper" data-drupal-selector="edit-captcha-image-wrapper" id="edit-captcha-image-wrapper"><img data-drupal-selector="edit-captcha-image" src="/image-captcha-generate/652316831/1741102550" width="180" height="60" alt="Image CAPTCHA" title="Image CAPTCHA" loading="lazy" typeof="foaf:Image" />
|
||
</div>
|
||
<div class="form-item js-form-item form-type-textfield js-form-type-textfield form-item-captcha-response js-form-item-captcha-response">
|
||
<label for="edit-captcha-response" class="usa-label form-required">
|
||
What code is in the image?
|
||
<span class="usa-label--required"> <span class="usa-sr-only">Required</span>*</span></label>
|
||
|
||
|
||
<input autocomplete="off" data-drupal-selector="edit-captcha-response" aria-describedby="edit-captcha-response--description" type="text" id="edit-captcha-response" name="captcha_response" value="" size="15" maxlength="128" class="form-text required usa-input" required="required" aria-required="true" />
|
||
|
||
|
||
|
||
<div id="edit-captcha-response--description" class="description help-block">
|
||
Enter the characters shown in the image.
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
<div class="captcha__description description">This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.</div>
|
||
</fieldset>
|
||
<div data-drupal-selector="edit-actions" class="form-actions js-form-wrapper form-wrapper" id="edit-actions--2"><input data-drupal-selector="edit-submit" type="submit" id="edit-submit" name="op" value="Save" class="button button--primary js-form-submit form-submit usa-button" /></div>
|
||
|
||
<div class="comments__disclaimer padding-top-2">
|
||
<em>Please be respectful when posting comments. We will post all comments without editing as long as they are appropriate for a public, family friendly website, are on topic and do not contain profanity, personal attacks, misleading or false information/accusations or promote specific commercial products, services or organizations. Comments that violate our comment policy or include links to non-government organizations/web pages will not be posted.</em>
|
||
</div>
|
||
</form>
|
||
|
||
|
||
</section>
|
||
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
<aside class="nist-page__region nist-page__region--sidebar-second tablet-lg:grid-col-4">
|
||
|
||
<div>
|
||
|
||
<div
|
||
class="nist-block"
|
||
>
|
||
|
||
|
||
|
||
<div>
|
||
<div about="/blogs/taking-measure">
|
||
|
||
|
||
<div
|
||
class="nist-block no-print"
|
||
>
|
||
|
||
<h2
|
||
class="nist-block__title"
|
||
>Our Science in Your Inbox</h2>
|
||
|
||
<div class="text-long"><p>Subscribe to our weekly emails.</p>
|
||
<form action="https://public.govdelivery.com/accounts/USNIST/subscribers/qualify" accept-charset="UTF-8" method="post">
|
||
<input name="utf8" type="hidden" value="✓">
|
||
<input type="hidden" name="authenticity_token" value="GleKn0r3EFkuIRsIWsyLN6Mrqim4qc3U7eIUCWGqBFz2ziQ/qv0gnQTJUhVbKHMSlmrsC7UHIm6S8IfK6qk9EQ==">
|
||
<input type="hidden" name="topic_id" id="topic_id" value="USNIST_309">
|
||
<div class="grid-row grid-gap-1">
|
||
<div class="tablet:grid-col-8">
|
||
<label class="usa-sr-only" for="email">Enter Email Address</label>
|
||
<input class="usa-input" type="text" name="email" id="email" title="email" placeholder="Your Email Address">
|
||
</div>
|
||
<div class="tablet:grid-col-4">
|
||
<input type="submit" name="commit" value="Sign Up" class="usa-button margin-top-1">
|
||
</div>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
<div
|
||
class="views-exposed-form usa-form filters nist-block" novalidate="novalidate" data-drupal-selector="views-exposed-form-search-blog-taking-measure-search-page"
|
||
>
|
||
|
||
<h2
|
||
class="nist-block__title"
|
||
>Search</h2>
|
||
|
||
<form action="/blogs/taking-measure/search" method="get" id="views-exposed-form-search-blog-taking-measure-search-page" accept-charset="UTF-8" class="usa-form">
|
||
<div class="form-item js-form-item form-type-textfield js-form-type-textfield form-item-k js-form-item-k form-no-label">
|
||
|
||
|
||
<input placeholder="Search this blog" data-drupal-selector="edit-k" type="text" id="edit-k" name="k" value="" size="30" maxlength="128" class="form-text usa-input" />
|
||
|
||
|
||
|
||
<div id="edit-k--description" class="description help-block">
|
||
Put exact phrase in quotes (e.g., "artificial intelligence")
|
||
</div>
|
||
</div>
|
||
<div class="grid-col-12 form-actions js-form-wrapper form-wrapper" data-drupal-selector="edit-actions" id="edit-actions"><input data-drupal-selector="edit-submit-search-blog" type="submit" id="edit-submit-search-blog" value="Search" class="button js-form-submit form-submit usa-button" /></div>
|
||
|
||
|
||
</form>
|
||
|
||
|
||
</div>
|
||
<div
|
||
class="nist-block no-print"
|
||
>
|
||
|
||
<h2
|
||
class="nist-block__title"
|
||
>Stay connected</h2>
|
||
|
||
|
||
|
||
<div><a href="https://www.facebook.com/nist" class="nist-social nist-social--facebook" title="Facebook" ><span>Facebook</span></a><a href="https://www.linkedin.com/company/nist" class="nist-social nist-social--linkedin" title="LinkedIn" ><span>LinkedIn</span></a><a href="https://www.x.com/nist" class="nist-social nist-social--x" title="X (Twitter)" ><span>X (Twitter)</span></a><a href="https://www.youtube.com/nist" class="nist-social nist-social--youtube" title="Youtube" ><span>Youtube</span></a><a href="https://www.instagram.com/nist/" class="nist-social nist-social--instagram" title="Instagram" ><span>Instagram</span></a><a href="https://public.govdelivery.com/accounts/USNIST/subscriber/new?topic_id=USNIST_309" class="nist-social nist-social--envelope" title="GovDelivery" ><span>GovDelivery</span></a></div>
|
||
|
||
</div>
|
||
|
||
<div
|
||
class="views-element-container nist-block"
|
||
>
|
||
|
||
<h2
|
||
class="nist-block__title"
|
||
>Categories</h2>
|
||
|
||
<div><div class="js-view-dom-id-278c446d4e454ebb08b54fc0858522fdf80725f3a4beeae2704323cc27871798">
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div>
|
||
<select class="usa-select ViewsJumpMenu js-viewsJumpMenu" title="-- Choose --" id="blog-categories-takingm-jump-menu">
|
||
<option>-- Choose --</option>
|
||
<option data-url="/blogs/taking-measure/categories/249466">Advanced communications</option>
|
||
<option data-url="/blogs/taking-measure/categories/248321">Bioscience</option>
|
||
<option data-url="/blogs/taking-measure/categories/248371">Buildings and Construction</option>
|
||
<option data-url="/blogs/taking-measure/categories/248416">Chemistry</option>
|
||
<option data-url="/blogs/taking-measure/categories/248486">Electronics</option>
|
||
<option data-url="/blogs/taking-measure/categories/248531">Energy</option>
|
||
<option data-url="/blogs/taking-measure/categories/248561">Environment</option>
|
||
<option data-url="/blogs/taking-measure/categories/248586">Fire</option>
|
||
<option data-url="/blogs/taking-measure/categories/248616">Forensic Science</option>
|
||
<option data-url="/blogs/taking-measure/categories/248651">Health</option>
|
||
<option data-url="/blogs/taking-measure/categories/249421">Information technology</option>
|
||
<option data-url="/blogs/taking-measure/categories/2748236">Infrastructure</option>
|
||
<option data-url="/blogs/taking-measure/categories/248866">Manufacturing</option>
|
||
<option data-url="/blogs/taking-measure/categories/248946">Materials</option>
|
||
<option data-url="/blogs/taking-measure/categories/249011">Mathematics and statistics</option>
|
||
<option data-url="/blogs/taking-measure/categories/249051">Metrology</option>
|
||
<option data-url="/blogs/taking-measure/categories/249126">Nanotechnology</option>
|
||
<option data-url="/blogs/taking-measure/categories/249451">Neutron research</option>
|
||
<option data-url="/blogs/taking-measure/categories/249426">Performance excellence</option>
|
||
<option data-url="/blogs/taking-measure/categories/249241">Physics</option>
|
||
<option data-url="/blogs/taking-measure/categories/249461">Public safety</option>
|
||
<option data-url="/blogs/taking-measure/categories/249456">Resilience</option>
|
||
<option data-url="/blogs/taking-measure/categories/249341">Standards</option>
|
||
<option data-url="/blogs/taking-measure/categories/2813456">Technology transfer</option>
|
||
<option data-url="/blogs/taking-measure/categories/249396">Transportation</option>
|
||
</select>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
</div>
|
||
</aside>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
<div class="grid-container">
|
||
|
||
|
||
</div>
|
||
|
||
</section>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
|
||
|
||
<div data-elastic-exclude>
|
||
<!-- nist-index-ignore-start -->
|
||
|
||
<footer class="nist-footer padding-bottom-4">
|
||
|
||
|
||
<div class="grid-container nist-footer__info">
|
||
<div class="grid-row">
|
||
<div class="tablet:grid-col-6">
|
||
<div class="nist-footer__logo">
|
||
<a href="/" title="National Institute of Standards and Technology" rel="home">
|
||
<img class="nist-footer__logo-img" src="/libraries/nist-component-library/dist/img/logo/NIST-Logo-Brand-White.svg" alt="National Institute of Standards and Technology logo" width="300px" height="42px" />
|
||
</a>
|
||
</div>
|
||
<div class="nist-footer__contact">
|
||
<h3 class="nist-footer__contact-heading">HEADQUARTERS</h3>
|
||
<address>
|
||
100 Bureau Drive<br>
|
||
Gaithersburg, MD 20899<br>
|
||
<a href="tel:301-975-2000">301-975-2000</a>
|
||
</address>
|
||
<p>
|
||
<a href="mailto:do-webmaster@nist.gov">Webmaster</a> | <a href="https://www.nist.gov/about-nist/contact-us">Contact Us</a> | <a href="https://www.nist.gov/visit">Our Other Offices</a>
|
||
</p>
|
||
</div>
|
||
</div>
|
||
<div class="tablet:grid-col-6">
|
||
<div class="nist-footer__social-links">
|
||
|
||
<a class="nist-social nist-social--x-white" href=" https://x.com/NIST">
|
||
<span>X.com</span>
|
||
</a>
|
||
|
||
<a class="nist-social nist-social--facebook-white" href=" https://www.facebook.com/NIST">
|
||
<span>Facebook</span>
|
||
</a>
|
||
|
||
<a class="nist-social nist-social--linkedin-white" href=" https://www.linkedin.com/company/nist">
|
||
<span>LinkedIn</span>
|
||
</a>
|
||
|
||
<a class="nist-social nist-social--instagram-white" href=" https://www.instagram.com/nist/">
|
||
<span>Instagram</span>
|
||
</a>
|
||
|
||
<a class="nist-social nist-social--youtube-white" href=" https://www.youtube.com/NIST">
|
||
<span>YouTube</span>
|
||
</a>
|
||
|
||
<a class="nist-social nist-social--giphy-white" href=" https://giphy.com/nist">
|
||
<span>Giphy</span>
|
||
</a>
|
||
|
||
<a class="nist-social nist-social--rss-white" href=" https://www.nist.gov/news-events/nist-rss-feeds">
|
||
<span>RSS Feed</span>
|
||
</a>
|
||
|
||
<a class="nist-social nist-social--envelope-white" href=" https://public.govdelivery.com/accounts/USNIST/subscriber/new">
|
||
<span>Mailing List</span>
|
||
</a>
|
||
</div>
|
||
<div class="nist-footer__feedback">
|
||
How are we doing? <a class="usa-button" rel="nofollow" href="/form/nist-gov-feedback?destination=/blogs/taking-measure/houston-we-have-engine-remnants-how-my-lab-pieced-together-forgotten-part" title="Provide feedback">Feedback</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
<div class="grid-container">
|
||
<div class="nist-footer__nav" role="navigation">
|
||
<ul>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/privacy-policy">Site Privacy</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/oism/accessibility">Accessibility</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/privacy">Privacy Program</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/oism/copyrights">Copyrights</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.commerce.gov/vulnerability-disclosure-policy">Vulnerability Disclosure</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/no-fear-act-policy">No Fear Act Policy</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/office-director/freedom-information-act">FOIA</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/environmental-policy-statement">Environmental Policy</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/summary-report-scientific-integrity">Scientific Integrity</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.nist.gov/nist-information-quality-standards">Information Quality Standards</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://www.commerce.gov/">Commerce.gov</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="http://www.science.gov/">Science.gov</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="http://www.usa.gov/">USA.gov</a>
|
||
</li>
|
||
<li class="nist-footer__menu-item">
|
||
<a href="https://vote.gov/">Vote.gov</a>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
</footer>
|
||
<!-- nist-index-ignore-end -->
|
||
</div>
|
||
|
||
</div>
|
||
|
||
|
||
|
||
<script type="application/json" data-drupal-selector="drupal-settings-json">{"path":{"baseUrl":"\/","pathPrefix":"","currentPath":"node\/1841561","currentPathIsAdmin":false,"isFront":false,"currentLanguage":"en"},"pluralDelimiter":"\u0003","suppressDeprecationErrors":true,"back_to_top":{"back_to_top_button_trigger":100,"back_to_top_speed":1200,"back_to_top_prevent_on_mobile":false,"back_to_top_prevent_in_admin":true,"back_to_top_button_type":"image","back_to_top_button_text":"Back to top"},"google_analytics":{"account":"G-HEQ0YF2VYL","trackOutbound":true,"trackMailto":true,"trackTel":true,"trackDownload":true,"trackDownloadExtensions":"7z|aac|arc|arj|asf|asx|avi|bin|bsh|c|csv|doc(x|m)?|dot(x|m)?|dw(fx|g|gd)|dxf|eps|epub|exe|f(90)|flv|gif|gz|gzip|hqx|jar|jpe?g|js|m1v|mp(2|3|4|e?g)|mobi|mov(ie)?|msi|msp|pdf|phps|pl|png|ppt(x|m)?|pot(x|m)?|pps(x|m)?|ppam|sld(x|m)?|thmx|qtm?|ra(m|r)?|rfa|rtf|rvt|sch|sea|sit|swf|tar|tgz|tif|txt|txz|wav|wma|wmv|wpd|wrl|xls(x|m|b)?|xlt(x|m)|xlam|xml|xsd|z|zip"},"nist_search":{"clickTracking":"search-report-click","isDebug":false,"clickTrackEnabled":true,"message":"NIST Search in debug mode. Check the browsers network inspector for Click Track reporting results..."},"data":{"extlink":{"extTarget":false,"extTargetNoOverride":false,"extNofollow":false,"extNoreferrer":false,"extFollowNoOverride":false,"extClass":"ext","extLabel":"(link is external)","extImgClass":false,"extSubdomains":true,"extExclude":"\\.gov\\\/|\\.mil\\\/|\\manufacturingusa\\.com\\\/","extInclude":"","extCssExclude":".ck-editor, .nist-video-thumbnail__lightbox-trigger, a.nist-icon--mail-blue","extCssExplicit":"","extAlert":true,"extAlertText":"Thank you for visiting NIST. We hope your visit was informative. We have provided a link to this site because it has information that may be of interest to our users. NIST does not necessarily endorse the views expressed or the facts presented on this site. Further, NIST does not endorse any commercial products that may be advertised or available on this site. Click OK to be directed to your link.","mailtoClass":"0","mailtoLabel":"(link sends email)","extUseFontAwesome":false,"extIconPlacement":"after","extFaLinkClasses":"fa fa-external-link","extFaMailtoClasses":"fa fa-envelope-o","whitelistedDomains":[]}},"viewsJumpMenu":{"blog-categories-takingm-jump-menu":{"new_window":false}},"ajaxTrustedUrl":{"\/blogs\/taking-measure\/search":true,"\/comment\/reply\/node\/1841561\/comment_node_blog":true},"user":{"uid":0,"permissionsHash":"bd6a443844dbe99b4e6942f3b1397526e760137efd2b1ee6b2d588fc414dff20"},"antibot":{"forms":{"comment-form":{"id":"comment-form","key":"8s3HerPNUiBWAup-NU0eICdfN5XSJ1VRGAW7gyEytXD"}}}}</script>
|
||
<script src="/sites/default/files/js/js_jDaFaXhHm6gPUKstNYX9eIyoQXghVs3g7rbR0QoqpYY.js?scope=footer&delta=0&language=en&theme=nist_www&include=eJxdkAuOwyAMRC8E9ZGQCQ51CzgCp2lvX8hHu6qEBG8Yz0j2OD2dSj8L-L-3ezQTRWIihwXTR3lq8CuYwk3dzF0LspUkGJzWHsIlQsTju7ES56XKi-BXGC27pnfK1HsleawuS4DADX0PTlyeuwdiEo_JniNwJwxUL3Tbtv1z0FvHIIS6LphuJ5pJcqail3yi9R_7YtqoHskZY-GZJzPE5h5rXlz3rbCzHWwHGyzKXhTO-zZLzaavQ6leFQd9AQAFjIc"></script>
|
||
<script src="https://siteimproveanalytics.com/js/siteanalyze_6017546.js" async></script>
|
||
<script src="/sites/default/files/js/js_phYs2jDctfdGpas0b2o3STtb7Y4B0bPDz-8rro3OgSg.js?scope=footer&delta=2&language=en&theme=nist_www&include=eJxdkAuOwyAMRC8E9ZGQCQ51CzgCp2lvX8hHu6qEBG8Yz0j2OD2dSj8L-L-3ezQTRWIihwXTR3lq8CuYwk3dzF0LspUkGJzWHsIlQsTju7ES56XKi-BXGC27pnfK1HsleawuS4DADX0PTlyeuwdiEo_JniNwJwxUL3Tbtv1z0FvHIIS6LphuJ5pJcqail3yi9R_7YtqoHskZY-GZJzPE5h5rXlz3rbCzHWwHGyzKXhTO-zZLzaavQ6leFQd9AQAFjIc"></script>
|
||
<script type="text/javascript">window.NREUM||(NREUM={});NREUM.info={"beacon":"bam.nr-data.net","licenseKey":"37b7ccb661","applicationID":"1089704227","transactionName":"YFxUN0sADEdYVkBaClkWdwBNCA1aFnFGRhVWVWoNVgUHaHpaWkcXWFVaBks9LFtdUGJaAEB6WQ1NEw1YVVBGHltBUFMU","queueTime":4,"applicationTime":1083,"atts":"TBtXQQMaH0k=","errorBeacon":"bam.nr-data.net","agent":""}</script></body>
|
||
</html>
|