Journal of research of the National Bureau of Standards最新文献_第2页

SURFACE METROLOGY A Report on the Fourth International Conference on the Metrology and Properties of Engineering Surfaces, National Bureau of Standards, Gaithersburg, MD, April 13–15, 1988 《第四届工程表面计量与特性国际会议报告》，国家标准局，马里兰州盖瑟斯堡，1988年4月13-15日

Journal of research of the National Bureau of Standards Pub Date : 1988-09-01 DOI: 10.6028/jres.093.154

T. Vorburger

引用次数: 0

The NBS Vision System in the AMRF AMRF中的NBS视觉系统

Journal of research of the National Bureau of Standards Pub Date : 1988-08-01 DOI: 10.6028/jres.093.145

M. Nashman, K. Chaconas

引用次数: 1

The National Bureau of Standards becomes the National Institute of Standards and Technology 国家标准局更名为国家标准与技术研究院

Journal of research of the National Bureau of Standards Pub Date : 1988-08-01 DOI: 10.6028/JRES.093.155

K. G. Kessler

{"title":"The National Bureau of Standards becomes the National Institute of Standards and Technology","authors":"K. G. Kessler","doi":"10.6028/JRES.093.155","DOIUrl":"https://doi.org/10.6028/JRES.093.155","url":null,"abstract":"On August 23, 1988 President Reagan signed the Omnibus Trade and Competitiveness Act and changed the name of the National Bureau of Standards to the National Institute of Standards and Technology (NIST). Under a section of this new law known as the \"Technology Competitiveness Act,\" several new assignments designed to boost U.S. industry in the world marketplace are added to the traditional functions of NIST. NIST will continue to serve as the Nation's central laboratory for developing and disseminating measurement standards and scientific data for science, engineering, manufacturing, commerce, industry, and education. NIST will continue to provide a variety of services to the scientific and technical communities, including calibration services, standard reference data, and standard reference materials. These activities and the continuing research programs will continue to form the technical core of NIST. New activities NIST has been assigned to develop are: 1. Create a series of Regional Centers for the Transfer of Manufacturing Technology that will be affiliated with non-profit institutions and organizations; 2. Develop a program to provide assistance and make Federal technology available to State and local technology programs and technology extension services; 3. Establish an Advanced Technology Program to encourage the commercialization of new high-technology products; and 4. Support a Department of Commerce Clearinghouse for State and Local Initiatives on Productivity, Technology, and Innovation to provide technical and analytical help to State and local officials making decisions on technology policy. In keeping with the new name of our laboratories, we have changed the name of this journal to:","PeriodicalId":17082,"journal":{"name":"Journal of research of the National Bureau of Standards","volume":"93 1","pages":"635"},"PeriodicalIF":0.0,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71363032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An Improvement in the Reliability of Standard Cell Enclosures 标准电池外壳可靠性的改进

Journal of research of the National Bureau of Standards Pub Date : 1988-07-01 DOI: 10.6028/jres.093.144

B. Field, L. Ruimin

引用次数: 0

Condensation Method for Humidity Measurement in the UMR Cloud Simulation Chamber UMR云模拟室湿度测量的冷凝法

Journal of research of the National Bureau of Standards Pub Date : 1988-07-01 DOI: 10.6028/jres.093.147

D. Hagen, D. R. White, D. J. Alofs

引用次数: 1

International Comparisons of Pressure Standards: A Status Report 压力标准的国际比较:现状报告

Journal of research of the National Bureau of Standards Pub Date : 1988-07-01 DOI: 10.6028/jres.093.146

C. Tilford

引用次数: 1

Practical Uncertainty Limits to the Mass Determination of a Piston-Gage Weight 活塞计重量质量测定的实际不确定度限值

Journal of research of the National Bureau of Standards Pub Date : 1988-07-01 DOI: 10.6028/jres.093.149

R. Davis, B. E. Welch

引用次数: 5

Precipitation of NH4UO2PO4·3H2O—Solubility and Structural Comparison with Alkali Uranyl(2 +) Phosphates NH4UO2PO4·3h2o的沉淀——与碱性磷酸铀酰(2 +)的溶解度及结构比较

Journal of research of the National Bureau of Standards Pub Date : 1988-07-01 DOI: 10.6028/jres.093.148

M. Marković, N. Pavković, N. Pavković

{"title":"Precipitation of NH4UO2PO4·3H2O—Solubility and Structural Comparison with Alkali Uranyl(2 +) Phosphates","authors":"M. Marković, N. Pavković, N. Pavković","doi":"10.6028/jres.093.148","DOIUrl":"https://doi.org/10.6028/jres.093.148","url":null,"abstract":"Precipitates formed in the system UO2(NO3)2-NH4OH-H3PO4-H2O, aged for 30 days at 298 K, were studied. The precipitates were characterized by chemical and thermogravimetric analyses, x-ray powder diffraction, infrared spectroscopy, polarized light microscopy, and by their fluorescent properties. The precipitation boundary was established tindallometrically and microscopically. On the basis of these measurements, the stability conditions, structural parameters, and solubility of the tetragonal polymorph of NH4[UO2PO4]·3H2O were determined. This compound shows a close structural relationship with H3O[UO2PO4]·3H2O (space group P4/ncc) and alkali uranyl(2+)phosphates polyhydrates M[UO2PO4]·nH2O (n =4 for M=Li; n =3 for M=Na, K, Rb and n =2.5 for M=Cs). The unit-cell dimensions determined for NH4UO2PO4·3H2O are: a=b=7.02 Å, c=18.08 Å (P4/ncc). The thermodynamic solubility product constant, Ks=a(NH4+)×a(UO22+)×a(PO43−), for NH4UO2PO4·3H2O was determined: log Ks= −26.50±0.09. The Ks values of M[UO2PO4]·n H2O (at ionic strength, I=0.23 mol dm−3) calculated from previously published experimental data by using correct stability constants of uranyl(2+)phosphate complexes are: log Ks=−22.61±0.08 for M=Na; log Ks= −23.92±0.12 for M=K; log Ks= −24.13±0.19 for M=Rb; log Ks= −23.80±0.20 for M=Cs; and log Ks= −24.74±0.10 for M=NH4,showing that NH4UO2PO4·3H2O is less soluble than corresponding alkali uranyl(2+)phosphates.","PeriodicalId":17082,"journal":{"name":"Journal of research of the National Bureau of Standards","volume":"93 1","pages":"557 - 563"},"PeriodicalIF":0.0,"publicationDate":"1988-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71362927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Applications of the Reaction Interface/Mass Spectrometer Technique to the Analysis of Selected Elements and Nuclides from Submicrogram Quantities of Biological Macromolecules and Xenobiotics 反应界面/质谱仪技术在亚微克级生物大分子和异种生物中选定元素和核素分析中的应用

Journal of research of the National Bureau of Standards Pub Date : 1988-06-01 DOI: 10.6028/jres.093.102

D. Chace, F. Abramson

{"title":"Applications of the Reaction Interface/Mass Spectrometer Technique to the Analysis of Selected Elements and Nuclides from Submicrogram Quantities of Biological Macromolecules and Xenobiotics","authors":"D. Chace, F. Abramson","doi":"10.6028/jres.093.102","DOIUrl":"https://doi.org/10.6028/jres.093.102","url":null,"abstract":"Markey and Abramson [1] developed a microwave-powered chemical reaction interface, a device which converts a complex organic molecule in the presence of a reactant gas into small stable molecules which are detected by mass spectrometry. For a given reactant gas the molecules formed are a representation of the elemental composition of the original anlayte. The combination of the reaction interface and a mass spectrometer produces an isotopeor element-selective detector for samples either introduced directly into the reaction interface or flowing from a capillary gas chromatograph column. Microgram and submicrogram samples of a variety of proteins were analyzed for their sulfur content relative to their carbon content by introducing the samples directly into the reaction interface. With CO, as the reactant gas, S02 at m/z 64 is produced. This quantifies the amount of sulfur which was introduced into the reaction interface. In the presence of N2, HCN at m/z 27 is produced and is used to quantify the carbon content of the sample. The observed ratio of S/C for various proteins correlated well with the elemental formulas [2]. In the presence of S02, 4NO at m Iz 30 and 5NO at m/z 31 are produced. Following administration of 50 mg of triple-labeled 5,5-diphenylhydantoin (1, 3(\"N); 2('C)] to a male beagle dog, a urine sample was selectively analyzed for its 15N content by capillary gas chromatography-reaction interface/ mass spectrometry. The corrected ratio of m/z 31 to m/z 30 produced a highly selective chromatogram showing only peaks of '5N enrichment. Mass spectra of these peaks were obtained which Alkylation of DNA In Vivo: Development of Analytical Methodology for Trace Quantitative Analysis","PeriodicalId":17082,"journal":{"name":"Journal of research of the National Bureau of Standards","volume":"93 1","pages":"419 - 419"},"PeriodicalIF":0.0,"publicationDate":"1988-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71362772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Design of Cost-Effective QC Procedures for Clinical Chemistry Assays 设计具有成本效益的临床化学检测质量控制程序

Journal of research of the National Bureau of Standards Pub Date : 1988-06-01 DOI: 10.6028/jres.093.022

J. Westgard

引用次数: 0