Bureau of Standards Journal of Research最新文献_第8页

The optical properties, densities, and solubilities of the normal formates of some metals of group II of the periodic system 某些周期体系中II族金属的正甲酸盐的光学性质、密度和溶解度

Bureau of Standards Journal of Research Pub Date : 1933-08-01 DOI: 10.6028/JRES.011.017

F. Ashton, D. F. Houston, C. Saylor

引用次数: 5

Aerodynamic characteristics of automobile models 汽车模型的空气动力学特性

Bureau of Standards Journal of Research Pub Date : 1933-08-01 DOI: 10.6028/JRES.011.021

R. H. Heald

引用次数: 6

A basis for the comparison of x-rays generated by voltages of different wave form 比较由不同波形电压产生的x射线的基础

Bureau of Standards Journal of Research Pub Date : 1933-08-01 DOI: 10.6028/jres.011.022

L. Taylor, G. Singer, C. Stoneburner

引用次数: 0

Thermal expansion of columbium 钶的热膨胀

Bureau of Standards Journal of Research Pub Date : 1933-08-01 DOI: 10.6028/JRES.011.020

P. Hidnert, H. S. Krider

引用次数: 5

Preliminary list of terms for the arc spectrum of tantalum 钽的弧谱术语初步表

Bureau of Standards Journal of Research Pub Date : 1933-08-01 DOI: 10.6028/JRES.011.019

C. C. Kiess, H. K. Kiess

{"title":"Preliminary list of terms for the arc spectrum of tantalum","authors":"C. C. Kiess, H. K. Kiess","doi":"10.6028/JRES.011.019","DOIUrl":"https://doi.org/10.6028/JRES.011.019","url":null,"abstract":"A preliminary list of Ta i terms, accounting for most of the strong arc lines, is presented. The low 4F and 4P terms and the metastable 6D and 4D terms are identified with those to be expected theoretically from the electron configurations 5d*>Qs 2 and 5d 4 -6s. CONTENTS Page I. Introductory note 277 II. Term table for Ta i 278 I. INTRODUCTORY NOTE The arc and spark spectra of tantalum have been observed at the Bureau of Standards from 2,000 A in the ultraviolet to 10,300 A in the infrared. These spectra are exceedingly rich in lines and the work of compiling the wave lengths and separating them according to the degree of ionization of the emitting atoms is still incomplete. Many of the arc lines are clearly complex, but are not sufficiently resolved on our plates to give their exact structure. Zeeman effects for many of the tantalum lines have been observed also, but only a few of them, apparently, are based on the gr-values of simple (LS) coupling. With the aid of these new data, we have been able to classify most of the strong Ta i lines, including those that are complex. The terms upon which this classification is based are given in the table below and are offered at this time in response to several requests that have been made of the Bureau of Standards for them. Theoretically the terms result from the interaction of five valence electrons which occupy the O and P shells. In the unexcited state of the atom the electrons form the configuration 5d 3 • 6s from which arise the even terms F, P, H, G, etc. The configuration 5c/ 4 . 6s gives the metastable terms D, D, H, G, I, etc. The more prominent terms of these groups have now been found and it is their combinations with higher odd terms that account for most of the strong Ta i lines. At this stage of the analysis, it is not possible to arrange with certainty these odd terms into multiplet groups and to assign specifically to each its electronic origin. Accordingly, in this preliminary note, the odd terms are designated only by their inner quantum numbers, affixed to the letters Z, Y, X, etc., except in a few instances where the term character is clearly indicated by the Zeeman effect. The numerical values of the terms are arbitrarily based on the assumption that the lowest term is F^ = 0.00. 277 278 Bureau of Standards Journal of Research II. TERM TABLE FOR Ta I Term type V Term type V FW 0.0 Vfe 26, 960. 4 F2^ 2, 010. Uk 28, 133. 9 F3^ T2^ 28, 188. 4 4F^ 5, 621. 4D^ 28, 862. 1 Poh 6, 049. 4 ~&ht 30, 894. 7 Pih 6, 068. 9 Q2H 31, 600. 9 ^2H Pfo 31, 961. 4 0& 32, 486. 8 4V y2 4D^ 9, 975. 8 Ni* 34, 792. 2 4D 2^ 9, 253. 5 M§^ 35, 707. 3 D3^ 10, 690. 3 Ll^ 35, 876. 5 K§h 36, 069. 2 Doh 9, 759. 6D1H 10, 950. 2 Z§h 23, 926. 7 6D2H 11,243. 6 Y334 24, 981. 8 6I^ 12, 234. 7 x§^ 26, 585. 9 E>4K 13, 351. 5 W$* 27, 780. 6 Vfe 28, 182. 6 z§^ 23, 355. 4 Ufca 29, 723. Yo3^ 24, 516. 7 T334 30, 015. 6 4D§^ 25, 512. 6 R§^ 33, 197. 7 2Qta 26, 866. Q§^ 35, 858. 8 W§H 38, 994. 3 P314 37, 143. 3 Zf^ 24, 243. 4 o§^ 3","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"17 1","pages":"277"},"PeriodicalIF":0.0,"publicationDate":"1933-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341728","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: 5

The activity coefficients of hydroxyl ion in solutions of calcium hydroxide at 30 degrees C 30℃氢氧化钙溶液中羟基离子的活度系数

Bureau of Standards Journal of Research Pub Date : 1933-08-01 DOI: 10.6028/JRES.011.014

E. Flint, L. S. Wells

引用次数: 2

An international comparison of temperature scales between 660 degrees and 1,063 degrees C 660度到1063度的国际温度比较

Bureau of Standards Journal of Research Pub Date : 1933-07-01 DOI: 10.6028/JRES.011.003

W. F. Roeser, F. H. Schofield, H. Moser

引用次数: 2

The present status of the standards of thermal radiation maintained by the Bureau of Standards 国家标准局维护的热辐射标准的现状

Bureau of Standards Journal of Research Pub Date : 1933-07-01 DOI: 10.6028/JRES.011.008

W. Coblentz, R. Stair

{"title":"The present status of the standards of thermal radiation maintained by the Bureau of Standards","authors":"W. Coblentz, R. Stair","doi":"10.6028/JRES.011.008","DOIUrl":"https://doi.org/10.6028/JRES.011.008","url":null,"abstract":"The basis of the lamp standards of radiation, established and maintained by the Bureau of Standards since 1913, is the black body using the Stefan-Boltzmann constant of total radiation <7= 5.70X10 watt/cm/deg. 4 In this paper the present status of the value of the constant of total radiation is reviewed, and it is concluded that, for the present, the basis of the lamp calibration remains unchanged. These carbon-filament lamp standards of thermal radiation maintained by the Bureau of Standards (S227) were intercompared after a lapse of 12 years and found in good agreement with the original standards which were established in 1913 by direct comparison with a black body. Two reproductions of these standards which, according to published reports, showed rapid deterioration in radiant flux, were recalibrated. No deterioration, to 2 parts in 840, could be measured in the radiation emitted by one of these lamps which had been in use 8 years. In the other lamp an increase in radiant flux, amounting to about 1 percent, was found. This was caused by a hot spot in the filament, probably resulting from usage or perhaps by injury in shipment. In a life test, a standard of radiation was operated for 245 hours before an increase in radiant flux became appreciable, and at the expiration of 300 hours this increase amounted to only 0.8 percent. One section is devoted to the technique of operation, and specific directions are given to insure high precision.","PeriodicalId":56324,"journal":{"name":"Bureau of Standards Journal of Research","volume":"11 1","pages":"79"},"PeriodicalIF":0.0,"publicationDate":"1933-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71341704","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: 12

Note on an improved chain-packed distilling column 关于改进的链式填充蒸馏塔的说明

Bureau of Standards Journal of Research Pub Date : 1933-07-01 DOI: 10.6028/JRES.011.009

S. Schicktanz

引用次数: 6

Equuipment for testing current transformers 电流互感器试验设备

Bureau of Standards Journal of Research Pub Date : 1933-07-01 DOI: 10.6028/JRES.011.010

F. B. Silsbee, R. Smith, N. L. Forman, J. H. Park

引用次数: 3