1035 lines
84 KiB
Text
1035 lines
84 KiB
Text
<!DOCTYPE html>
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<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# ">
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<head>
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<img alt="an opalescent close up of Roman glass. There is a clear semi-circular fracture in the center of the piece. " height="300" loading="lazy" src="/sites/default/files/styles/480_x_480_limit/public/images/2020/05/21/Fractured%20Roman%20glass.png?itok=y94EXDKx" title="Fractured Roman glass" typeof="foaf:Image" width="480">
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<figcaption class="nist-image__caption">NIST guest researcher George Quinn is applying his expertise in fractography to ancient Roman glass.<div class="nist-image__credit">
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<span class="nist-image__credit-label">Credit:</span>
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G. Quinn/NIST
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<p>Cracking the code for artifacts of antiquity — NIST guest researcher George Quinn is applying his expertise in fractography to ancient Roman glass. </p>
|
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<p>Our world is built on ceramics and glass, from colorful windows decorating our finest architecture to parts for engines and bullet-resistant windshields. This is George’s realm, where he uses precise measurement techniques to interpret what makes these materials fracture. </p>
|
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<p>But what about glass from the days of old? Centuries ago, ancient Romans discovered an incredibly stable form of glass (soda lime silica) and traded it throughout their empire. Some remnants now rest in the Corning Museum of Glass, which maintains finished and raw fragments unearthed in Israel at an archaeological dig in the 1960s. </p>
|
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<p>Since the pieces’ chemical compositions are nearly identical to modern glass, museum researchers connected with George to investigate some raw samples. He and colleague Jeffrey Swab from the U.S. Army Aberdeen Proving Ground cut bars from the glass chunks, then introduced a controlled crack about one-third to one-half of the way through them and finally bent them until they broke into two pieces. </p>
|
||
|
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<p>As it turns out, Roman glass is pretty close to modern glass, just 6% less resistant to fracture.</p>
|
||
|
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<p>In an archaeologist’s toolbox, modern fracture analyses like this can help us learn how ancient glass was made or how it broke. In this case, the lower resistance could be from degradation while buried for centuries or a hasty process that Romans may have used to make the raw stock quality glass.</p>
|
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<p>Our NISTers are incorporating the findings into the next edition of <em><a data-entity-substitution="canonical" data-entity-type="node" data-entity-uuid="a7d5c300-2804-40f2-8bbc-8ae85f6c0bd0" href="/publications/nist-recommended-practice-guide-fractography-ceramics-and-glasses-2nd-edition" title="NIST Recommended Practice Guide: Fractography of Ceramics and Glasses, 2nd edition">Fractography of Ceramics and Glasses</a>,</em> a widely used practice guide for the ceramic and glass industry. In the meantime, you can find more details about <a href="https://www.jstor.org/stable/26862839?seq=1">this research</a> in the <em>Journal of Glass Studies.</em></p>
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<div class="text-with-summary"> Tissue Engineering Measurands: Tissue engineering measurands are confusing to discuss and a charting method to improve communication is demonstrated. Measurement Assurance Strategies for Regenerative Medicine: Reliable methods for assessing product consistency and quality. Regenerative Medicine
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<div class="text-with-summary"> Project activities include: Electronic structure of semiconductor-oxide interfaces. Thermodynamics of flexible microporous materials for gas storage Gas adsorption in microporous materials Analysis of topological materials, including magnetic topological insulators High-throughput screening of
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<div class="text-with-summary"> Every deliberate effort to develop a new material or to improve processing begins with chemical composition and the conditions (temperature, pressure) under which pure compounds and their mixtures are stable ( an equilibrium phase diagram ). In the absence of such information, materials scientists
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<h3><span property="schema:name">MMSD Staff Release Version 5.2 of SRD31, Phase Equilibria Diagrams (PED)</span>
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