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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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Mechanical compliance measurements of single- edge-notch tension specimens 单刃缺口拉伸试样的机械顺应性测量
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1970-06-01 DOI: 10.6028/JRES.074C.016
M. Orloski
{"title":"Mechanical compliance measurements of single- edge-notch tension specimens","authors":"M. Orloski","doi":"10.6028/JRES.074C.016","DOIUrl":"https://doi.org/10.6028/JRES.074C.016","url":null,"abstract":"Single edge notch tension Al alloy specimens mechanical compliance measurement, solving stress functions for various gage length-sample width combinations","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1970-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128440719","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
Design features of a precision ac-dc converter 一种精密交直流变换器的设计特点
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1969-07-01 DOI: 10.6028/JRES.073C.006
L. Marzetta, D. R. Flach
{"title":"Design features of a precision ac-dc converter","authors":"L. Marzetta, D. R. Flach","doi":"10.6028/JRES.073C.006","DOIUrl":"https://doi.org/10.6028/JRES.073C.006","url":null,"abstract":"With the avai lability today of high performance operation al a mplifie rs and r elated co mpone nts, it is poss ible to co ns truct an ins trume nt for ac-dc transfer work that meets t.he requlre~e nt s of a s tandards labora tory. Transformation of meas ured average a-c values Into doc .volt.age IS possIble wIth a predI ctable accuracy of 20 parts per million up to 1 kHz. PrecIsIon of opera tIOn IS assured from dc to 100 kHz.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"9 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1969-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124087182","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
An improved high-precision calibration procedure for reference standard hydrometers 改进的参考标准比重计高精度校准程序
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1969-07-01 DOI: 10.6028/JRES.073C.007
H. A. Bowman, William H. Gallagher
{"title":"An improved high-precision calibration procedure for reference standard hydrometers","authors":"H. A. Bowman, William H. Gallagher","doi":"10.6028/JRES.073C.007","DOIUrl":"https://doi.org/10.6028/JRES.073C.007","url":null,"abstract":"This pape r describes a me thod of calibra ting hydromete rs whic h. a lthoug h no more accurate tha t the technique used he re tofore at the Na tiona l Burea u of S ta nd a rds, reduces calibration time from se ve ral days to a few hours. The p rocedure is based upon eas ily measured h yd rome ter we ight , s tem sca le geometry, and flotat ion leve l measurement s a t onl y one liquid density. The reliability of thi s s ingle leve l is improved by o bse rving the hydrome te r Rotation und er va ri ous we ight loads. The ca libra ti on ex pe riment is o ri en ted toward aut omati c data reduction so the fini shed ca libra ti o n report is of much wide r app li ca bility than the s imple co rrection ta ble de rived fro m t he old er experim e nt.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1969-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134065837","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
The nuclear quadrupole resonance magnetometer: A new method for the precision measurement of the magnitude and direction of magnetic fields 核四极共振磁强计:一种精确测量磁场大小和方向的新方法
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1969-07-01 DOI: 10.6028/JRES.073C.008
M. Linzer
{"title":"The nuclear quadrupole resonance magnetometer: A new method for the precision measurement of the magnitude and direction of magnetic fields","authors":"M. Linzer","doi":"10.6028/JRES.073C.008","DOIUrl":"https://doi.org/10.6028/JRES.073C.008","url":null,"abstract":"A theore ti ca l investigation of the feasibility of a magne tometer b ased on the observation of the Zeeman s plitting of a nu c lea r quadrupole resonance line is present ed. With a s ingle c rys tal of potas' s ium chlo rate as the se nsor, an nqr magnetome ter with ce nte r freque ncy of 28 MHz and bandwidth of 10 MHz could cover a ran ge of 10 nT to greate r than 1 T. Prec is ion a t s pec ifi c c rysta l o ri entations sho uld approach 10 nT in the magnitude of the field, at flux densities exceeding 100 \",,1' , and (65/8) microradians in the direction of the fi e ld where 8 is the flux density in mT. If circ ul a rl y po larized rf e xc itation is e mployed, a precis ion of 10 nT could be achieved at flux dens ities less than 100 \"\"T. Accuracy of the flu x density measure ments is limit ed b y the uncertaint.y in the gyromagnetic ratio of 3sC I, whi ch at the present tim e is approximately 1 X 10·. The effert of the s mall asymmetry parame ter whjch charac te rizes the \"\"C! resonance in KCIOa is analyzed. Various experimental arrangements are proposed to record the magn itude and d irection of the fi e ld , to obtain high re solution at low field s and good linearity at high fields, to overcome the difficulties due to the presence of a small asymmetry parameter, and to make an ins tantaneous measurement of the Zeeman splitting frequency.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"17 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1969-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115364015","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
Nonlinear constrained optimization by a nonrandom complex method 一种非随机复变方法的非线性约束优化
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1968-10-01 DOI: 10.6028/JRES.072C.019
R. A. Mitchell, J. Kaplan
{"title":"Nonlinear constrained optimization by a nonrandom complex method","authors":"R. A. Mitchell, J. Kaplan","doi":"10.6028/JRES.072C.019","DOIUrl":"https://doi.org/10.6028/JRES.072C.019","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131875395","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: 10
Analytical studies of probe conduction errors in ground temperature measurements 地温测量中探头传导误差的分析研究
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1968-10-01 DOI: 10.6028/jres.072c.018
B. Peavy
{"title":"Analytical studies of probe conduction errors in ground temperature measurements","authors":"B. Peavy","doi":"10.6028/jres.072c.018","DOIUrl":"https://doi.org/10.6028/jres.072c.018","url":null,"abstract":"Ve rti ca l probes with temperature sensing e lements placed at fixed positions along their length are commonl y used for measurin g earth te mperature variations with time. Mainly for structural reaso ns, the probes are co m prised of materia ls whose thermal properties a re not the sa me as those of th e surrounding earth, so that the te mpe ratures as meas ured at a given time by the probe are not the same as th at. for the und isturbed earth. A mathe matical analys is for s teady period ic, two-dimensional hea t Row in a two body composite has been made to determ ine the probe co nduction errors in ground te mperature measureme nts. Several examples a re given to show the relative magnitude of probe conduction errors.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130307427","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
Theoretical and experimental study on longitudinal impact of tapered rods 锥形杆纵向冲击的理论与实验研究
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1968-10-01 DOI: 10.6028/JRES.072C.017
L. Hettche
{"title":"Theoretical and experimental study on longitudinal impact of tapered rods","authors":"L. Hettche","doi":"10.6028/JRES.072C.017","DOIUrl":"https://doi.org/10.6028/JRES.072C.017","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115391052","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: 2
Gas density balance design considerations 气体密度平衡设计注意事项
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1968-07-01 DOI: 10.6028/JRES.072C.013
E. C. Creitz
{"title":"Gas density balance design considerations","authors":"E. C. Creitz","doi":"10.6028/JRES.072C.013","DOIUrl":"https://doi.org/10.6028/JRES.072C.013","url":null,"abstract":"The Nerheim gas density balance operates by measuring the flow produced by differences in density between a sample and a reference gas in the earth's gravitational field. It has been considered theoretically in order to outline the characteristics of the gas Aow system, those of the flow measuring anemometers, and the effects of detector volume on peak separation and sensitivity. It is shown that both design parameters and operating conditions affect the performance of the device, and that properly considered compromises can improve its characteristics.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115000083","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
Standard mismatch - the production of controlled small reflections in waveguides 标准失配-波导中产生可控的小反射
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1968-07-01 DOI: 10.6028/JRES.072C.014
L. Lewin
{"title":"Standard mismatch - the production of controlled small reflections in waveguides","authors":"L. Lewin","doi":"10.6028/JRES.072C.014","DOIUrl":"https://doi.org/10.6028/JRES.072C.014","url":null,"abstract":"The reflection prope rti es of poss ible suitable s tructures, for producing small accurately contro ll ed re fl ec tions in rectangular waveguide, a re examin ed and a choice made of cylindrical posts for a more detai led s tud y. A numbe r of sources of e rror du e to ohmic loss, positioning and s hape are inves tigated, and it is shown th at both the indu ctive a nd capac itive post can meet reaso nable specifica tions but that the latter is the more suitab le on almos t a ll count s. Attention to pos t s ize a nd tilt is nece~sary, but the accuracies needed li e well within th e ran ge ac hi evable by good engineering practice.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126001413","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: 3
Viscoelastic behavior of dental amalgam 牙用汞合金的粘弹性行为
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1968-07-01 DOI: 10.6028/JRES.072C.015
P. Oglesby, G. Dickson, M. L. Rodriguez, R. Davenport, W. Sweeney
{"title":"Viscoelastic behavior of dental amalgam","authors":"P. Oglesby, G. Dickson, M. L. Rodriguez, R. Davenport, W. Sweeney","doi":"10.6028/JRES.072C.015","DOIUrl":"https://doi.org/10.6028/JRES.072C.015","url":null,"abstract":"Measure ments made on dent a l a malgam in tens ion indica te th at a malga m exhib its three types of vi scoelasti c phe nome na: (1) inst antaneous e las ti c s tra in , (2) re ta rded e las ti c st ra in (transie nt c reep), and (3) viscous s train (s teady state c reep). T he co mbina tion of e lasti c plus re ta rded strain can be repre· sent ed by a n eq uation of the form f = A(T + 8 '(J' where A a nd 8 a re fun c ti ons of time but not of the stress, (J . T he viscous s train ra te ca n be represented b y a n equ a tion of the form €v = K(J'\" where K a nd m a re constants of the mate ri a l. By a pplying a nonlin ear genera li zation of th e Bolt zma nn s upe rposi ti on principl e to a ge neral eq ua tion descri bing the creep behav ior of a malgam, the results of c reep tests can be d irectl y re la ted to the resu lts of st ress-s train tes ts.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1968-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128508153","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: 9
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