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

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Absolute value of g at the National Bureau of Standards g在国家标准局的绝对值
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-04-01 DOI: 10.6028/JRES.070C.013
D. R. Tate
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引用次数: 2
Reference tables for the Pt-30 percent Rh versus Pt-6 percent Rh thermocouple pt - 30% Rh和pt - 6% Rh热电偶的参考表
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-04-01 DOI: 10.6028/JRES.070C.010
G. W. Burns, J. Gallagher
{"title":"Reference tables for the Pt-30 percent Rh versus Pt-6 percent Rh thermocouple","authors":"G. W. Burns, J. Gallagher","doi":"10.6028/JRES.070C.010","DOIUrl":"https://doi.org/10.6028/JRES.070C.010","url":null,"abstract":"Reference tab les for the platinum-30 pe rcen t rhodium ve rsus platinum-6 pe rcent rhod ium the rmoco uple have been es tab lished for the range 0 to 1820 °C based upon the ca librations of the rmocoup les furni shed by th ree manufact urers in th e Unit ed S tates and by o ne European manufac ture r. The th e rmocouples we re ca lib ra ted by co mparison with s ta nd a rd ins trume nts s uc h as p latinum res ista nce th e rmom ete rs, platinum -10 percent rhodium versus platinum th ermuco upl es and opti ca l pyro me te rs. Th e tes t procedures and fac iliti es used {or the calibrations are desc ri bed and the acc uracy of the measu re me nts is di scussed. The platinum-rhodium e le ments of the th e rmocouples we re examin ed by a gene ral qua lit ative s pectroche mical method and th e res ult s of the ana lyses are given. Tabl es of emf of the indi vidua l e lement s of the th e rmocouple vers us Pt -27 for the ra nge 0 to 1500 °C are a lso present ed . In add ition , the effec t of variations in th e a lluy in g pe rce ntages of platinum an d rhud ium on the te mperature-e mf re lat ions hips of the element s a re show n. The resu lt s of ca li brat ions fur oth er Pt -30 pe rcent Rh ve rsus Pt-6 pe rce nt Rh the rm ocouples, whi ch we re received for routin e calibratiun at NBS durin g the period from May 1963 to March 1965, a re a lso s hown.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131245157","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: 6
Design and statistical procedures for the evaluation of an automatic gamma-ray point-source calibrator 自动伽玛射线点源校准器评估的设计和统计程序
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1966-04-01 DOI: 10.6028/jres.070c.007
S. Garfinkel, W. B. Mann, W. Youden
{"title":"Design and statistical procedures for the evaluation of an automatic gamma-ray point-source calibrator","authors":"S. Garfinkel, W. B. Mann, W. Youden","doi":"10.6028/jres.070c.007","DOIUrl":"https://doi.org/10.6028/jres.070c.007","url":null,"abstract":"A description is given of the mechani'cal design and operation uf all autumatic gamma-ray ~uint­ Source calibrator. The use of statistical design in experiments for evaluating performance factors, such as inter changeability of stations and run differences using the same data obtained in comparisons of the sources, is described in detail.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1966-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126158943","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: 0
A transistor screening procedure using leakage current measurements 使用泄漏电流测量的晶体管筛选程序
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1965-10-01 DOI: 10.6028/jres.069c.037
G. Conrad, D. C. Shook
{"title":"A transistor screening procedure using leakage current measurements","authors":"G. Conrad, D. C. Shook","doi":"10.6028/jres.069c.037","DOIUrl":"https://doi.org/10.6028/jres.069c.037","url":null,"abstract":"A stud y of the aging behavior of low-power germa nium alloy switching trans is tors has revealed a rela tions hi p between s mall changes in junction leakage c urrent, induced by a brief aging stress, and later dete riora tion in pe rformance. This relations hip may provide the bas is for a nondes t ru ctive screening procedure whic h would se rve to identify ge rmanium alloy t~an s i s tors likely to deteriorate through excess ive growth of junction leakage current. The proposed screening procedure ir. volves the de termination of rela tively small changes in junction leakage current, increases of the order of IS percent or more, assoc iated with 1,000 hours of aging at a shelf (bake) s tress of 100 0c. Because the leakage curren t changes of interest are s mall, relatively high de mands are placed upon measurement re lJeatabilit y. There is evide nce that transis tors bearin g identical type nu mbers but of different ma nufac ture respond diffe ren tly to the same screenin g procedu res a nd would the refore require di f· ferent scree nin g li mits .","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128892511","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: 0
Voltage dependence of precision air capacitors 精密空气电容器的电压依赖性
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1965-10-01 DOI: 10.6028/JRES.069C.031
J. Q. Shields
{"title":"Voltage dependence of precision air capacitors","authors":"J. Q. Shields","doi":"10.6028/JRES.069C.031","DOIUrl":"https://doi.org/10.6028/JRES.069C.031","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123025134","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: 24
Electric currents and potentials resulting from the flow of charged liquid hydrocarbons through short pipes 带电液态碳氢化合物流过短管而产生的电流和电位
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1965-10-01 DOI: 10.6028/JRES.069C.036
M. R. Shafer, D. Baker, K. R. Benson
{"title":"Electric currents and potentials resulting from the flow of charged liquid hydrocarbons through short pipes","authors":"M. R. Shafer, D. Baker, K. R. Benson","doi":"10.6028/JRES.069C.036","DOIUrl":"https://doi.org/10.6028/JRES.069C.036","url":null,"abstract":"The elec trical c urre nts and pote ntials produced in pipes of intermediate and very hi gh resistiviti es, by the fl ow of a c harged liquid hydrocarbon have been investigated . The maximum pipe currents to the ground were in the range 1 to 6 microamperes. Depending upon the electrical resis tance of the p ipes, these c urrents produced pote ntials ranging from esse ntiall y zero to values in excess of 30,000 volts whic h were suffi cie ntly severe to cause electri cal breakdown and arcs within some of the pipes unde r investiga tion. It is concluded that haza rdous pipe pote ntials, resulting from s tati c elec· tnclty,can be eliminated in practi ca l applica tions if the elec trical res ,s tance from each and a ny portion of the IIlterlOr surface of the pipe to the ground does not exceed about 107 ohms.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114578770","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: 14
Comparators for voltage transformer calibrations at NBS 国家标准局电压互感器校准比较器
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1965-10-01 DOI: 10.6028/JRES.069C.030
W. Sze
{"title":"Comparators for voltage transformer calibrations at NBS","authors":"W. Sze","doi":"10.6028/JRES.069C.030","DOIUrl":"https://doi.org/10.6028/JRES.069C.030","url":null,"abstract":"An inductive comparator is desc ribed for measuring ra tio-co rrec tion·fac to r a nd phase·a ngle e rror of voltage transformers by com parison with refe rence tra nsformers. The s im ple c irc uit utili zes a res is tance-capacitance ne twork and a n induc ti ve vo ltage divide r. The re lative magnitude of the ratio· correction·factors is obtained from the dia l readings of the induc tive vo ltage divide r, and the phase angle between the voltage phasors is equal to ± wC R. The acc uracy of these meas urement s at 60 and 400 he rtz is within 2 parts-per-m illion for ra ti o and within 10 microradians for phase a ngle a t the limits of the phase·angl e range of ± 38 milliradians. O nl y a few ranges of refere nce transform e rs a re required s ince fractional ratios from 1/1 to 1/4 may be measured as readil y as ratios nea r unit y, without diminution in accuracy. A general discussion of a resis tive co mpa rator, which has bee n in con· tinuo us operation a t NBS s ince 1939, is included.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"185 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115801467","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: 4
Precision method for evaluating primary aberrations of lenses with a Twyman interferometer 用Twyman干涉仪测量透镜初级像差的精度方法
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1965-10-01 DOI: 10.6028/jres.069c.029
J. B. Saunders
{"title":"Precision method for evaluating primary aberrations of lenses with a Twyman interferometer","authors":"J. B. Saunders","doi":"10.6028/jres.069c.029","DOIUrl":"https://doi.org/10.6028/jres.069c.029","url":null,"abstract":"A simplified procedure for separat e evaluation of the three prim ary aberra tions of lenses wit h the Twyman le ns tes ting inte rfe romet e r is described. Eac h of the aberra tion coeffi cien ts is found to be a fun ction of observations at only four points on the lens . Equations a re give n for the optimum c hoice of refere nce points that give best res ult s. These equations are applied to dat a pre vi ously re ported in the lite ra ture. The results indicate that thi s procedure is suffi cie ntl y precise to reveal high orde r aberrations in a lens th at was assumed to be practically free from suc h a be rrations.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115129337","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: 0
The Sondheimer-Wilson-Kohler formula in platinum resistance thermometry 铂电阻测温中的Sondheimer-Wilson-Kohler公式
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1965-10-01 DOI: 10.6028/JRES.069C.033
R. J. Corruccini
{"title":"The Sondheimer-Wilson-Kohler formula in platinum resistance thermometry","authors":"R. J. Corruccini","doi":"10.6028/JRES.069C.033","DOIUrl":"https://doi.org/10.6028/JRES.069C.033","url":null,"abstract":"An attempt was made to determine the ideal resistivity versus temperature function for platinum by a parameter-variation method using the Sondheimer-Wilson-Kohler formula for the deviation from Matthiessen's rule. At the same time a test of the applicability of the SWK formula for practical thermometry was made by examining the accuracy with which it could fit the resistance-temperature functions of selected thermometers, the characteristics of which were restricted in a manner believed to favor their accurate representation. No ideal resistivity function could be found such that most of the thermometers could be accurately represented.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129383610","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
Stress analysis of tape-wound magnet coils 卷绕式磁线圈的应力分析
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1965-10-01 DOI: 10.6028/JRES.069C.034
J. Hord
{"title":"Stress analysis of tape-wound magnet coils","authors":"J. Hord","doi":"10.6028/JRES.069C.034","DOIUrl":"https://doi.org/10.6028/JRES.069C.034","url":null,"abstract":"A liquid hydrogen cooled, tape-wound, axially segmented, high-purity aluminum electromagnet has been built and tested to 95 kilogauss with a magnet power consumption of 22 kilowatts. Formulae for the axial, radial, and circumferential stress components in this type coil are derived under the assumptions of isotropy and homogeneity. Both plane strain and plane stress analyses are gIven. The hoop stress is also derived from the \"floating shell\" concept using thin shell theory. The for mulae from these analyses and thick-wall cylinder theory are used to calculate the hoop stresses in the experimental coil, and the results are presented for comparison. The theoretical burst field of a monolithic cylindrical coil disk is derived.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1965-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129098363","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
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