Journal of research of the National Bureau of Standards (1977)最新文献_第9页

WAYS TO STANDARDIZATION IN ELECTROPHORESIS ARE BROUGHT TO LIGHT. 提出了电泳标准化的途径。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-05-01 DOI: 10.6028/jres.090.014

Dennis J Reeder

引用次数: 0

Comparison of Solid Density Standards Between IMGC and NBS. IMGC和NBS固体密度标准的比较。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-05-01 DOI: 10.6028/jres.090.011

Anna Peuto, Richard S Davis

引用次数: 6

An Apparatus for Direct Fugacity Measurements on Mixtures Containing Hydrogen. 一种直接测量含氢混合物逸度的装置。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-03-01 DOI: 10.6028/jres.090.009

Thomas J Bruno

{"title":"An Apparatus for Direct Fugacity Measurements on Mixtures Containing Hydrogen.","authors":"Thomas J Bruno","doi":"10.6028/jres.090.009","DOIUrl":"https://doi.org/10.6028/jres.090.009","url":null,"abstract":"An apparatus has been designed and constructed to allow measurements of fugacities in gaseous mixtures containing hydrogen. The apparatus makes use of a semipermeable membrane to allow a direct measurement of the partial pressure of a permeating component (in this case, hydrogen) in a mixture with a nonpermeating component. In this study, measurements were made on mixtures of hydrogen/methane and hydrogen/propane. The apparatus is designed to operate at moderate and high temperatures (ambient to 250 °C) and moderate and high mixture pressures (3 to 50 MPa). The actual pressure range that is experimentally accessible is dependent on the fluid mixture under study, due to its influence on the pressure gradient across the semipermeable membrane. The pressure measurements are done isothermally on a series of concentrations of the binary. Each mixture is characterized using a developmental gas-chromatograph which has been built especially for this work. The gas-chromatograph was calibrated using standard mixtures of hydrogen/methane and hydrogen/propane, prepared gravimetrically in our laboratory. Using measured values of the mixture pressure, hydrogen partial pressure and mixture mole fraction at a given temperature, fugacity coefficients were determined using the virial equation. The measured values are compared with some previous data and general trends are discussed.","PeriodicalId":93321,"journal":{"name":"Journal of research of the National Bureau of Standards (1977)","volume":"90 2","pages":"127-138"},"PeriodicalIF":0.0,"publicationDate":"1985-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6644925/pdf/jres-90-127.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39473784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

PROGRAMS CONSIDERED IN RADIATION INSTRUMENTS AND LABORATORY SYSTEM. 在辐射仪器和实验室系统中考虑的程序。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-03-01 DOI: 10.6028/jres.090.010

Elmer H Eisenhower

引用次数: 0

Spectral Transmittance Characteristics of Holmium Oxide in Perchloric Acid Solution. 高氯酸溶液中氧化钬的光谱透射特性。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-03-01 DOI: 10.6028/jres.090.008

Victor R Weidner, Radu Mavrodineanu, Klaus D Mielenz, Rance A Velapoldi, Kenneth L Eckerle, Bradley Adams

引用次数: 16

Standards for Measurement of the Critical Fields of Superconductors. 超导体临界场测量标准。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-03-01 DOI: 10.6028/jres.090.007

F R Fickett

引用次数: 15

New Results From Previously Reported NBS Fundamental Constant Determinations. 之前报道的NBS基本常数测定的新结果。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-03-01 DOI: 10.6028/jres.090.006

B N Taylor

引用次数: 22

Conference Report: PROMISES OF LARGE-SCALE COMPUTATION. 会议报告:大规模计算的前景。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-01-01 DOI: 10.6028/jres.090.005

B L Buzbee, H J Raveche

引用次数: 0

Development of a One-Micrometer-Diameter Particle Size Standard Reference Material. 一种直径为一微米的粒度标准参考物质的研制。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-01-01 DOI: 10.6028/jres.090.001

G W Mulholland, A W Hartman, G G Hembree, Egon Marx, T R Lettieri

{"title":"Development of a One-Micrometer-Diameter Particle Size Standard Reference Material.","authors":"G W Mulholland, A W Hartman, G G Hembree, Egon Marx, T R Lettieri","doi":"10.6028/jres.090.001","DOIUrl":"10.6028/jres.090.001","url":null,"abstract":"The average diameter of the first micrometer particle size standard (Standard Reference Material 1690), an aqueous suspension of monosized polystyrene spheres with a nominal 1 μm diameter, was accurately determined by three independent techniques. In one technique the intensity of light scattered by a diluted suspension of polystyrene spheres was measured as a function of scattering angle, using a He-Ne laser polarized in the vertical direction. The second technique consisted of measuring as a function of angle the intensity of light scattered from individual polystyrene spheres suspended in air, using a He-Cd laser with light polarized parallel and perpendicular to the scattering plane. The measurement of row length by optical microscopy for polystyrene spheres arranged in close-packed, two-dimensional hexagonal arrays was the basis of the third technique. The measurement errors for each technique were quantitatively assessed. For the light scattering experiments, this required simulation with numerical experiments. The average diameter determined by each technique agreed within 0.5% with the most accurate value being 0.895±0.007 μm based on light scattering by an aqueous suspension. Transmission electron microscopy, flow through electrical sensing zone counter measurements, and optical microscopy were also used to obtain more detailed information on the size distribution including the standard deviation (0.0095 μm), fraction of off-size particles, and the fraction of agglomerated doublets (1.5%).","PeriodicalId":93321,"journal":{"name":"Journal of research of the National Bureau of Standards (1977)","volume":"90 1","pages":"3-26"},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6768151/pdf/jres-90-003.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"39450922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

An Automated Coupled-Column Liquid Chromatography System for Measuring Aqueous Solubilities of Hydrophobic Solutes. 用于测量疏水性溶质水溶解度的自动耦合柱液相色谱系统。

Journal of research of the National Bureau of Standards (1977) Pub Date : 1985-01-01 DOI: 10.6028/jres.090.003

John W Owens, Howard DeVoe, Thomas J Buckley, Stanley P Wasik

引用次数: 2