Journal of Research of the National Institute of Standards and Technology最新文献_第7页

Influence of Machine Anvil Wear on Charpy Test Results 机械顶砧磨损对Charpy试验结果的影响

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-05-12 DOI: 10.6028/jres.125.015

E. Lucon, R. Santoyo

引用次数: 0

A Concept for Three-Dimensional Particle Metrology Based on Scanning Electron Microscopy and Structure-from-Motion Photogrammetry. 基于扫描电子显微镜和运动摄影测量结构的三维粒子计量概念

IF 1.3 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-04-29 eCollection Date: 2020-01-01 DOI: 10.6028/jres.125.014

Vipin N Tondare

{"title":"A Concept for Three-Dimensional Particle Metrology Based on Scanning Electron Microscopy and Structure-from-Motion Photogrammetry.","authors":"Vipin N Tondare","doi":"10.6028/jres.125.014","DOIUrl":"10.6028/jres.125.014","url":null,"abstract":"Scanning electron microscopy (SEM) has been frequently used for size and shape measurements of particles. SEM images offer two-dimensional (2D) information about a particle's lateral dimensions. Unfortunately, information about the particle's three-dimensional (3D) size and shape remains unavailable. To resolve this issue, I propose a new concept in SEM: 3D particle metrology obtained by applying structure-from-motion (SfM) algorithms to multiple rotational SEM images of particles deposited onto a cylindrical substrate to generate a 3D model from which size and shape information can be extracted. Particles can have any size that is suitable for SEM imaging. SEM images of the sample can be acquired from 0° to 360° using a rotational-tip SEM substage. Here, I will discuss the concept and, for clarity, illustrate it with aquarium gravel particles that are glued onto a craft roll and imaged optically before generating the 3D model of that handmade craft. Future work will include the experimental SEM realization, as well as further development of the SfM algorithms. In my view, this proposed concept may become an integral part of SEM-based particle metrology.","PeriodicalId":54766,"journal":{"name":"Journal of Research of the National Institute of Standards and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9017872/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47285671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advanced Temperature-Control Chamber for Resistance Standards 高级温控室电阻标准

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-04-10 DOI: 10.6028/jres.125.012

S. Payagala, A. Panna, A. Rigosi, D. Jarrett

引用次数: 1

Microscale Mapping of Structure and Stress in Barium Titanate 钛酸钡结构和应力的微尺度制图

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-04-04 DOI: 10.6028/jres.125.013

J. A. Howell, M. Vaudin, L. Friedman, R. Cook

引用次数: 0

The Statistics of Computer Clocks and the Design of Synchronization Algorithms 计算机时钟统计与同步算法设计

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-02-25 DOI: 10.6028/jres.125.008

J. Levine

{"title":"The Statistics of Computer Clocks and the Design of Synchronization Algorithms","authors":"J. Levine","doi":"10.6028/jres.125.008","DOIUrl":"https://doi.org/10.6028/jres.125.008","url":null,"abstract":"In this study, I used standard statistical tools (such as the various forms of the two-sample Allan variance) to characterize the clocks in computers, and I show how the results of this study are used to design algorithms to synchronize the computer clocks. These synchronization algorithms can be used to synchronize the time of a computer to a local reference clock or to a remote server. The algorithms by themselves are not intended to be a simple replacement for software that implements the Network Time Protocol (NTP) or any other similar application. Instead, they describe the statistical principles that should be used to design an algorithm to synchronize any computer clock by using data from any external reference received in any format. These algorithms have been used to synchronize the clocks of the computers that support the Internet Time Service operated by the National Institute of Standards and Technology (NIST), and I illustrate the performance of the algorithm with real-time data from these servers. In addition to presenting the design principles of the algorithm, I illustrate the principles with two specific examples: synchronizing a computer clock to a local reference signal, and the design of a synchronization process that is based on time-difference data received from a remote server over the public Internet. The message exchange between the local system and the remote server in this configuration is realized in NTP format, but that is not a fundamental requirement.","PeriodicalId":54766,"journal":{"name":"Journal of Research of the National Institute of Standards and Technology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46191885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

So, You Want to Have a Nanofab? Shared-Use Nanofabrication and Characterization Facilities: Cost-of-Ownership, Toolset, Utilization, and Lessons Learned 那么，你想拥有一个纳米fab?共享使用纳米制造和表征设施:拥有成本，工具集，利用和经验教训

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-02-21 DOI: 10.6028/jres.125.009

J. Liddle, Jerry Bowser, B. Ilic, V. Luciani

{"title":"So, You Want to Have a Nanofab? Shared-Use Nanofabrication and Characterization Facilities: Cost-of-Ownership, Toolset, Utilization, and Lessons Learned","authors":"J. Liddle, Jerry Bowser, B. Ilic, V. Luciani","doi":"10.6028/jres.125.009","DOIUrl":"https://doi.org/10.6028/jres.125.009","url":null,"abstract":"Nanofabrication/characterization facilities enable research and development activities across a host of science and engineering disciplines. The collection of tools and supporting infrastructure necessary to construct, image, and measure micro- and nanoscale materials, devices, and systems is complex and expensive to establish, and it is costly to maintain and optimize. As a result, these facilities are typically operated in a shared-use mode. We discuss the key factors that must be considered to successfully create and sustain such facilities. These include the need for long-term vision and institutional commitment, and the hands-on involvement of managers in facility operations. We consider startup, operating, and recapitalization costs, together with algorithms for cost recovery and tool-time allocation. The acquisition of detailed and comprehensive project and tool-utilization data is essential for understanding and optimizing facility operations. Only such a data-driven decision-making approach can maximize facility impact on institutional goals. We illustrate these concepts using the National Institute of Standards and Technology (NIST) NanoFab as our test case, but the methodologies and resources presented here should be useful to all those faced with this challenging task.","PeriodicalId":54766,"journal":{"name":"Journal of Research of the National Institute of Standards and Technology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46569098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Performance of Test Supermartingale Confidence Intervals for the Success Probability of Bernoulli Trials. 伯努利试验成功概率的检验上鞅置信区间的性能

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-02-05 eCollection Date: 2020-01-01 DOI: 10.6028/jres.125.003

Peter Wills, Emanuel Knill, Kevin Coakley, Yanbao Zhang

{"title":"Performance of Test Supermartingale Confidence Intervals for the Success Probability of Bernoulli Trials.","authors":"Peter Wills, Emanuel Knill, Kevin Coakley, Yanbao Zhang","doi":"10.6028/jres.125.003","DOIUrl":"10.6028/jres.125.003","url":null,"abstract":"Given a composite null hypothesis <math><msub><mi>ℋ</mi><mn>0</mn></msub></math>, test supermartingales are non-negative supermartingales with respect to <math><msub><mi>ℋ</mi><mn>0</mn></msub></math> with an initial value of <math><mn>1</mn></math>. Large values of test supermartingales provide evidence against <math><msub><mi>ℋ</mi><mn>0</mn></msub></math>. As a result, test supermartingales are an effective tool for rejecting <math><msub><mi>ℋ</mi><mn>0</mn></msub></math>, particularly when the <math><mi>p</mi></math>-values obtained are very small and serve as certificates against the null hypothesis. Examples include the rejection of local realism as an explanation of Bell test experiments in the foundations of physics and the certification of entanglement in quantum information science. Test supermartingales have the advantage of being adaptable during an experiment and allowing for arbitrary stopping rules. By inversion of acceptance regions, they can also be used to determine confidence sets. We used an example to compare the performance of test supermartingales for computing <math><mi>p</mi></math>-values and confidence intervals to Chernoff-Hoeffding bounds and the \"exact\" <math><mi>p</mi></math>-value. The example is the problem of inferring the probability of success in a sequence of Bernoulli trials. There is a cost in using a technique that has no restriction on stopping rules, and, for a particular test supermartingale, our study quantifies this cost.","PeriodicalId":54766,"journal":{"name":"Journal of Research of the National Institute of Standards and Technology","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10857825/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48652909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hylleraas-Configuration Interaction (Hy-CI) Non-Relativistic Energies for the 3 1 S , 4 1 S , 5 1 S , 6 1 S , and 7 1 S Excited States of the Beryllium Atom. 铍原子31s, 41s, 51s, 61s和71s激发态的hyleraas -组态相互作用(Hy-CI)非相对论能量

IF 1.3 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-02-05 eCollection Date: 2020-01-01 DOI: 10.6028/jres.125.006

James S Sims

{"title":"<ArticleTitle xmlns:ns0=\"http://www.w3.org/1998/Math/MathML\">Hylleraas-Configuration Interaction (Hy-CI) Non-Relativistic Energies for the 3 <ns0:math> <ns0:msup><ns0:mrow><ns0:mi></ns0:mi></ns0:mrow> <ns0:mrow><ns0:mn>1</ns0:mn></ns0:mrow> </ns0:msup> <ns0:mi>S</ns0:mi></ns0:math> , 4 <ns0:math> <ns0:msup><ns0:mrow><ns0:mi></ns0:mi></ns0:mrow> <ns0:mrow><ns0:mn>1</ns0:mn></ns0:mrow> </ns0:msup> <ns0:mi>S</ns0:mi></ns0:math> , 5 <ns0:math> <ns0:msup><ns0:mrow><ns0:mi></ns0:mi></ns0:mrow> <ns0:mrow><ns0:mn>1</ns0:mn></ns0:mrow> </ns0:msup> <ns0:mi>S</ns0:mi></ns0:math> , 6 <ns0:math> <ns0:msup><ns0:mrow><ns0:mi></ns0:mi></ns0:mrow> <ns0:mrow><ns0:mn>1</ns0:mn></ns0:mrow> </ns0:msup> <ns0:mi>S</ns0:mi></ns0:math> , and 7 <ns0:math> <ns0:msup><ns0:mrow><ns0:mi></ns0:mi></ns0:mrow> <ns0:mrow><ns0:mn>1</ns0:mn></ns0:mrow> </ns0:msup> <ns0:mi>S</ns0:mi></ns0:math> Excited States of the Beryllium Atom.","authors":"James S Sims","doi":"10.6028/jres.125.006","DOIUrl":"10.6028/jres.125.006","url":null,"abstract":"In a previous work Sims and Hagstrom [J Chem Phys 140,224312(2014)] reported Hylleraas-configuration interaction (Hy-CI) method variational calculations for the 1 S ground states of the beryllium isoelectronic sequence with an estimated accuracy of 10 to 20 nanohartrees (nHa). In this work the calculations have been extended to the five higher states of the neutral beryllium atom, 3 1 S, 4 1 S, 5 1 S, 6 1 S, and 7 1 S. The best non-relativistic energies obtained for these states are -14.4182 4034 6, -14.3700 8789 0, -14.3515 1167 6,-14.3424 0357 8, and -14.3372 6649 96 Ha, respectively. The 6 1 S result is superior to the known reference energy for that state, while for the 7 1 S state there is no other comparable calculation.","PeriodicalId":54766,"journal":{"name":"Journal of Research of the National Institute of Standards and Technology","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2020-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11302959/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47473752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Digitizing "The NBS Tables of Chemical Thermodynamic Properties: Selected Values for Inorganic and C1 and C2 Organic Substances in SI Units" 数字化“NBS化学热力学性质表：无机物质、C1和C2有机物质的国际单位选择值”

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-02-04 DOI: 10.6028/jres.125.007

J. J. Reed

引用次数: 20

In Situ Thermography of the Metal Bridge Structures Fabricated for the 2018 Additive Manufacturing Benchmark Test Series (AM-Bench 2018) 2018增材制造基准测试系列(AM-Bench 2018)金属桥梁结构的原位热成像

IF 1.5 4区工程技术

Journal of Research of the National Institute of Standards and Technology Pub Date : 2020-01-30 DOI: 10.6028/jres.125.005

J. Heigel, B. Lane, L. Levine, T. Phan, J. Whiting

引用次数: 10