Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation最新文献

Ball and cylinder interferometer 球筒干涉仪

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1972-03-01 DOI: 10.6028/JRES.076C.002

J. B. Saunders

引用次数: 47

Thermal voltage converters and comparator for very accurate ac voltage measurements 热电压转换器和比较器非常精确的交流电压测量

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-07-01 DOI: 10.6028/jres.075c.015

E. S. Williams

引用次数: 30

An extension to the sliding short method of connector and adaptor evaluation 对连接器和适配器评估的滑动短法的扩展

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-07-01 DOI: 10.6028/JRES.075C.018

G. Engen

引用次数: 9

A Burnett apparatus for the accurate determination of gas compressibility factors and second virial coefficients, and an evaluation of its capability based on some results for argon and carbon dioxide 一种精确测定气体压缩系数和二次维里系数的伯内特装置，并根据氩气和二氧化碳的一些结果对其性能进行了评价

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-07-01 DOI: 10.6028/JRES.075C.017

M. Waxman, J. R. Hastings

{"title":"A Burnett apparatus for the accurate determination of gas compressibility factors and second virial coefficients, and an evaluation of its capability based on some results for argon and carbon dioxide","authors":"M. Waxman, J. R. Hastings","doi":"10.6028/JRES.075C.017","DOIUrl":"https://doi.org/10.6028/JRES.075C.017","url":null,"abstract":"A Burn e tt a ppa ratu s has been deve lu pe d for th e de te rmina ti un uf th e cumpress ibilit y fac tu r uf gases, includin g corrus ive ha loge ni c gases, to a n accurac y of 0.1 pe rce nt to 0.01 pe rcent at te mpera tures fro m 0 to 225 °C and for pressures up to 250 ba rs. T he a ppa l'a tus has bee n used throughout thi s te mpe ra ture and press ure range and a t te mpe ratures within 15 °C of the c riti ca l te mpe ra ture of the sa mpl e gas. T he a ppa ra tu s fea lures a rugged ye t highl y sens iti ve and re prod ucibl e null-Iype press ure transdu ce r to isula te the sa mple gas witho ut inlrud uc in g a pressure uncert a int y grea te r tha n th e prec ision of the press ure measureme nts, whic h is be tt e r th an 1 pa rt in 50 ,000. The press ure measure ment s a re acc ura te to at leas t I pa rt in 20 ,000. Th e reduction of the da ta is di scussed ex tens ive ly. Th e ca pa bility of th e a ppa ra tu s ha s been evalua ted in te rm s of the compress ibilit y fac tor represented by a finit e pressure or densit y vi rial expans ion a nd de rived from a rgo n da ta a t 25 °C a nd press ures up to 250 ba rs and in te r ms of the secund vi ri a l cue ffi cie nt of ca rbon diox ide based on data at 50 °C a nd pressures be low 35 ba rs. Th e va lu e ubt ain ed fur thi s secund viria l c~e fli c i e nl. 102 .2 ± O.2 cm\"/ mol. com pa res fa vora bl y with th e va lue uf 102.5 c m\"/ mol ob ta in ed fro m a rece nt correla ti on a nd is in s ubstanti a l di sagree ment with th e va lu e of 100.7 ± O.4 c m \"/ mol de te rmin ed by Dad so n a nd cu· wo rk e rs fro m th e Burn e ll me thod and the pie zo me te r me thod .","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133467477","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: 8

Formulation and experimental verification of an axisymmetric finite-element structural analysis 轴对称有限元结构分析的公式及实验验证

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-07-01 DOI: 10.6028/JRES.075C.016

R. A. Mitchell, R. M. Woolley, C. Fisher

引用次数: 5

Accurate microwave high power measurements using a cascaded coupler method 使用级联耦合器方法精确测量微波高功率

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-07-01 DOI: 10.6028/JRES.075C.019

Kenneth E. Bramall

{"title":"Accurate microwave high power measurements using a cascaded coupler method","authors":"Kenneth E. Bramall","doi":"10.6028/JRES.075C.019","DOIUrl":"https://doi.org/10.6028/JRES.075C.019","url":null,"abstract":"The use of directional couple rs 10 e xte nd the ra nge o f low-le ve l power mete rs is a we ll eS la bli shed technique. Calibration of bolome te r-couple r unil s up 1020 dB is routin e a l N BS a nd olh e r labora lories and allows powe r measure me n I 10 the I W le ve l. For hi g her couplin g ra lios , howeve r, Ihe proble ms in calibration us ing conve ntiona l lechniqu es becomes mo re diffi c ult. Thi s pape r describes a cascade method whi ch a llows ca libra lion of low powe r me ter-couple r co mbin a l ions for meas ure me nl up 10 th e mega wa lt ra nge. Th e technique is based upo n s ys le m lin ea ril Y a nd th e unce rt a inty limil s are s how n 10 be 1 pe rcenl to 1.5 pe rcenl us ing NBS low powe r sla nda rd s . By using the N BS ca libra li on se rvices and co mm e rc ia ll y ava il a bl e equipme nt , th e above power le ve ls ca n be me asured with un ce rtainty limil s less Ih a n 2.7 pe rce n!. The me thod ca n a lso be adapted to measure me nl of la rge couplin g ra lios (2080 dB). Res ult s are given for power (200 wa il S in WR90 waveguide) a nd co upling ra lio (40 dB coax ia l coupl e r) meas ure me nts.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1971-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132849551","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

A program in refractory metal thermocouple research. 难熔金属热电偶研究程序。

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-06-01 DOI: 10.6028/JRES.075C.013

G. W. Burns, W. Hurst

引用次数: 2

Rotating adjustable transmission optical step attenuator 旋转可调传输光阶跃衰减器

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-04-01 DOI: 10.6028/JRES.075C.010

A. Cezairliyan

引用次数: 0

Apparatus for impact-fatigue testing 冲击疲劳试验装置

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-04-01 DOI: 10.6028/JRES.075C.012

R. E. Schramm, R. Durcholz, R. Reed

引用次数: 2

POLARIZATION MEASUREMENTS AS RELATED TO CORROSION OF UNDERGROUND STEEL PILING 与地下钢桩腐蚀有关的极化测量

Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1971-04-01 DOI: 10.6028/JRES.075C.014

W. Schwerdtfeger

引用次数: 6