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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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The near-zone magnetic field of a small circular-loop antenna 小型环形天线的近区磁场
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-10-01 DOI: 10.6028/JRES.071C.026
F. M. Greene
{"title":"The near-zone magnetic field of a small circular-loop antenna","authors":"F. M. Greene","doi":"10.6028/JRES.071C.026","DOIUrl":"https://doi.org/10.6028/JRES.071C.026","url":null,"abstract":"An improved formula is derived for accurately computing the near-zone magnetic field of a s mall c irc ular transmitting loop an tenna. Such a field can serve as a reference standard for calibrating fi eld-strength meters e mploying small receiving loop anten nas in the frequency range 30 Hz to 30 MHz. This formula inc ludes correction terms for fr equency (d ue to the finite time of propagation), as well as corrections for the finite radii of both the transmitting and receiving loops. Other formulas appearing in the literature often fail to include such correc tions whic h can result in errors of up to 20 pe rcent and more in computing standard-fie ld values. The NBS formula is de rived by ex panding the integrand of the re tarded vector potentia l into an infinite se ri es of sphe rica l Ha nkel fun c tions of in creasing o rde r. The resulting series express ion is in e rror by less than 0.2 pe rcent , is rap idl y co nverging and si mple to use without recourse to a table of fun c tions or a compute r.","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":"1967-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126381270","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: 68
Radiation-induced acoustic cavitation; apparatus and some results 辐射声空化;仪器和一些结果
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-10-01 DOI: 10.6028/JRES.071C.024
M. Greenspan, C. E. Tschiegg
{"title":"Radiation-induced acoustic cavitation; apparatus and some results","authors":"M. Greenspan, C. E. Tschiegg","doi":"10.6028/JRES.071C.024","DOIUrl":"https://doi.org/10.6028/JRES.071C.024","url":null,"abstract":"","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":"1967-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129588740","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: 78
Torsion creep of circular and noncircular tubes. 圆管和非圆管的扭转蠕变。
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-09-01 DOI: 10.6028/JRES.071C.019
L. Mordfin
{"title":"Torsion creep of circular and noncircular tubes.","authors":"L. Mordfin","doi":"10.6028/JRES.071C.019","DOIUrl":"https://doi.org/10.6028/JRES.071C.019","url":null,"abstract":"Torsion creep theory for circular and noncircular tubes using Bredt equation, measuring anisotropy in tubes, calculating torsion stresses","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"245 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124657531","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
Digitized low-frequency phasemeter assembled from logic modules 由逻辑模块组装的数字化低频相位计
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-07-01 DOI: 10.6028/JRES.071C.020
J. McKinney
{"title":"Digitized low-frequency phasemeter assembled from logic modules","authors":"J. McKinney","doi":"10.6028/JRES.071C.020","DOIUrl":"https://doi.org/10.6028/JRES.071C.020","url":null,"abstract":"A digital phase meter is described which is capable of operating from arbitrarily low freque ncies to 10 kHz, for which the lowe r limit de pends essentially upon the time avail abl e to the ope rator to make th e measu re me nt. The phasemeter involves a logic circuit whi ch can be assembled eas ily from co mm e rcially avail able logic modules without the necess ity of a proficiency in electronics. The output of the logic circ uit is read into a conventional digital preset frequency· ratio meter. The determination is absolute and utili zes a time base. Accordingly , no calibration against a phase standard is necessary. Th e agreement between this phasemeter and a quality phase shifter was found to be within ± O.Olo at 400 Hz, which is the accuracy s pecified by the manufacturer of the phase shifter. Considerable abil it y to ignore signal imperfections is inhere nt in thi s device.","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":"1967-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131857650","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
Procedure for high precision density determinations by hydrostatic weighing 流体静力称重高精度密度测定方法
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-07-01 DOI: 10.6028/JRES.071C.017
H. A. Bowman, R. Schoonover
{"title":"Procedure for high precision density determinations by hydrostatic weighing","authors":"H. A. Bowman, R. Schoonover","doi":"10.6028/JRES.071C.017","DOIUrl":"https://doi.org/10.6028/JRES.071C.017","url":null,"abstract":"There are seve ral s implifica tions which can be made in the performance of the hydrostatic experiment wh ich lead to more reproducible results. The operation of s ingle-pan two-knife balances is di sc ussed , and s imple mod ificat ions suggested to adapt it to hydros tati c work _ A data philosophy is Ilresented wh ich will be particularly applicable to a generation of now-developing force measuring mstruments when used in hydros tati c work. A s im pli fi ed form ul a for a ir density is presented and a formu la for es timat ing day-to-day variabi lit y in the dens ity of wate r. A simple ba la nce ca lib ration procedure is presented in an appendi x, and simpl ifi ed methods of fabri cating s us pension wires and degass ing sa mple s urfaces are described. T he use of these techniqu es is ill us trated by measure ments on s ilico n c rysla ls wh ich indicate process reproducibilil y of a standard deviatio'ri to a bo ut one part per mill ion.","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"76 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129919183","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: 77
Study of the storage stability of the barium fluoride film electric hygrometer element 氟化钡薄膜电湿度计元件贮存稳定性的研究
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-07-01 DOI: 10.6028/JRES.071C.018
F. Jones
{"title":"Study of the storage stability of the barium fluoride film electric hygrometer element","authors":"F. Jones","doi":"10.6028/JRES.071C.018","DOIUrl":"https://doi.org/10.6028/JRES.071C.018","url":null,"abstract":"A study of the aging properti es of the barium fluoride fi lm electri c h ygromete r e le me nt and of possible causes of the drift of ca libration with time in storage has been made. It was found th at exposure of aged e le me nts to glow discharge bomba rdment resulted in near recovery of the prestorage calibration , indi ca ting that the ca libration d ri ft was not ir reversibl e and providing in sight into the mechanis m of ag ing. Based on the li ke lihood tha t aging was du e, at leas t in part, to contamination of the barium flu or ide film , product ion procedures were formu lated which resulted in e le me nts with significantly red uced dr ift. If an adjustm e nt is mad e similar to the \" loc k-in\" procedure in the operational use of rad iosonde hu midit y e lements, the n th e posts torage res is tance va lu es ca n be adjusted to correspond closely to the pres torage ca librat ion c urves. Experime nt al e vide nce supports the hypothesis that conta min ation of the element s by diffu sion pump ing fluid in the produc tion process was a source of the calib rat ion dr ift. Applica tions of the e lement as a resea rc h tool in c loud ph ys ics, atmospheric turbulence a nd radio refrac tive index s tru c tu re s tudies, e vapora tion and e vaporation red uction s tudies , water vapor flu x de te rminations, and tropospheri c humidity di s tribu ion studies a re me ntioned .","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127427215","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
Polymeric materials for dielectric reference specimens 介质参考试样用高分子材料
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-04-01 DOI: 10.6028/JRES.071C.014
A. Scott, J. Kinard
{"title":"Polymeric materials for dielectric reference specimens","authors":"A. Scott, J. Kinard","doi":"10.6028/JRES.071C.014","DOIUrl":"https://doi.org/10.6028/JRES.071C.014","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130399701","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
The sensitivity of the Dicke radiometer 迪克辐射计的灵敏度
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-04-01 DOI: 10.6028/JRES.071C.015
D. Wait
{"title":"The sensitivity of the Dicke radiometer","authors":"D. Wait","doi":"10.6028/JRES.071C.015","DOIUrl":"https://doi.org/10.6028/JRES.071C.015","url":null,"abstract":"Th e lit e rature is re vi e wed conce rning the se nsitivit y of th e Di c ke rad iometer, exc luding ga in Ru e· tuatio ns. Disc re panc ies are point e d out and a ne w de ri vat ion of sens itivity us ing a Fouri e r tra ns form me thod is used to reso lve th ese disc re panc ies a nd to ex te nd th e res ult s to radiom e te rs with loss y s wit c hes . Exper ime nt a ll y it is s how n th at ra diom ete rs us ing a ha lf-wave squarelaw , linea r-l aw, int e rmedia telaw, o r e nve lope de tcc tors a ll have a se ns iti vit y eq ua l to th c th eo re ti ca l full -wave s quarelaw de tector (w ithin th e ±20 perce nt uncert a int y of th c cxpe rimcnt ).","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114579311","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: 38
An apparatus for measuring thermal expansion at elevated temperatures 在高温下测量热膨胀的仪器
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-04-01 DOI: 10.6028/JRES.071C.010
B. Rothrock, R. K. Kirby
{"title":"An apparatus for measuring thermal expansion at elevated temperatures","authors":"B. Rothrock, R. K. Kirby","doi":"10.6028/JRES.071C.010","DOIUrl":"https://doi.org/10.6028/JRES.071C.010","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"276 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127811214","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 dual-load flow calorimeter for rf power measurement to 4 GHz 一个双负载流量量热计用于射频功率测量到4 GHz
Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation Pub Date : 1967-04-01 DOI: 10.6028/JRES.071C.013
M. Crawford, P. A. Hudson
{"title":"A dual-load flow calorimeter for rf power measurement to 4 GHz","authors":"M. Crawford, P. A. Hudson","doi":"10.6028/JRES.071C.013","DOIUrl":"https://doi.org/10.6028/JRES.071C.013","url":null,"abstract":"","PeriodicalId":367668,"journal":{"name":"Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1967-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122297439","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
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