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A Correlation for the Second Interaction Virial Coefficients and Enhancement Factors for Moist Air. 潮湿空气的二次相互作用Virial系数与增强因子的相关性。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-07-01 DOI: 10.6028/jres.079A.017
R W Hyland
{"title":"A Correlation for the Second Interaction Virial Coefficients and Enhancement Factors for Moist Air.","authors":"R W Hyland","doi":"10.6028/jres.079A.017","DOIUrl":"10.6028/jres.079A.017","url":null,"abstract":"<p><p>Experimental measurements of the enhancement factors for mixtures of water vapor and CO<sub>2</sub>-free air have been made at -20, -10, and +70 °C. The results, coupled with previous experimental enhancement data, have been used to calculate the second interaction virial coefficients, <i>B</i> <sub><i>aw</i></sub> , for water vapor air mixtures from -50 to +90 °C. Within this temperature range, an error analysis shows that the uncertainties in <i>B</i> <sub><i>aw</i></sub> are between 6 and 10 percent. The calculated <i>B</i> <sub><i>aw</i></sub> <i>·</i> values are used in deriving enhancement factors at 10 °C intervals for -50<<i>t</i><90 °C, at varying pressure intervals from 0.25 to 100 bar. The associated uncertainties are shown as a function of pressure and temperature. The enhancement factors are extrapolated to -80 °C.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 4","pages":"551-560"},"PeriodicalIF":0.0,"publicationDate":"1975-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6565410/pdf/jres-79A-551.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37747701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 76
Precision Measurements of the Dimensional Stability of Four Mirror Materials. 四种镜面材料尺寸稳定性的精密测量。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-07-01 DOI: 10.6028/jres.079A.016
B Justice
{"title":"Precision Measurements of the Dimensional Stability of Four Mirror Materials.","authors":"B Justice","doi":"10.6028/jres.079A.016","DOIUrl":"https://doi.org/10.6028/jres.079A.016","url":null,"abstract":"<p><p>There are several glasses and glass-ceramics available today which have low coefficients of thermal expansion - some near zero. For this reason they often serve as substrates for massive mirrors in orbit. In order for such a mirror to enjoy a lifetime of 5 years or more of diffraction-limited service, the substrate must be dimensionally stable and thereby preserve the original figure. Early in l967, it was decided that the National Bureau of Standards and Corning Glass Works would undertake a joint effort to measure the lengths of small samples of such materials over a period of years. These measurements were completed in 1971. The average length changes in parts per million of the four materials selected are as follows: Corning Code 9623 a glass ceramic- 0.30Corning Code 7971 a titanium silicate- 0.37Corning Code 7940 a vitreous silica- 0.47Corning Code 9622 a glass-ceramic- 1.03.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 4","pages":"545-550"},"PeriodicalIF":0.0,"publicationDate":"1975-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6565407/pdf/jres-79A-545.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37747702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
The Third Spectrum of Copper (Cu iii). 铜的第三光谱（Cuiii）。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-05-01 DOI: 10.6028/jres.079A.014
A G Shenstone
{"title":"The Third Spectrum of Copper (Cu iii).","authors":"A G Shenstone","doi":"10.6028/jres.079A.014","DOIUrl":"10.6028/jres.079A.014","url":null,"abstract":"<p><p>An analysis of Cu iii based on observations from 500 to 6900 Å is presented. The low structures 3<i>d</i> <sup>9</sup> and 3<i>d</i> <sup>8</sup>4<i>s</i> are complete, including the rarely, if ever before, found 3<i>d</i> <sup>8</sup>(<sup>1</sup>S)4<i>s</i> <sup>2</sup>S. The 3<i>d</i> <sup>7</sup>4<i>s</i> <sup>2</sup> includes <sup>4</sup>F, <sup>2</sup>F, <sup>2</sup>G, and <sup>2</sup>H but the <sup>4</sup>P, <sup>2</sup>P, <i>a</i> <sup>2</sup>D, <i>b</i> <sup>2</sup>D have eluded all attempts to find them. The ionization potential calculated from 4<i>s</i>, 5<i>s</i>, 6<i>s</i> <sup>4</sup> <math> <mrow><msup><mrow></mrow> <mn>4</mn></msup> <msub><mtext>F</mtext> <mrow><msup><mn>4</mn> <mrow><mn>1</mn> <mo>/</mo> <mn>2</mn></mrow> </msup> </mrow> </msub> </mrow> </math> is 296 980 cm<sub>-1</sub> but by a comparison with Ni II which has a longer series an approximate value of 297 140 can be estimated. The 3<i>d</i> <sup>8</sup>4<i>d</i> group is complete, except for one level, as is 5<i>d</i>based on <sup>3</sup>F and <sup>1</sup>G, the other 5<i>d</i> groups being incomplete. 3<i>d</i> <sup>8</sup>(<sup>3</sup>F)4<i>f</i> is complete and 26 levels based on <sup>1</sup>D, <sup>3</sup>P, <sup>1</sup>G are known. 3<i>d</i> <sup>8</sup>(<sup>3</sup>F)5<i>g</i> is incomplete and a few levels based on <sup>1</sup>D and <sup>1</sup>G have been found. A discussion of the validity of the analysis of Cu iv by J. F. Schröder and Th. A. M. Van Kleef is given.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 3","pages":"497-521"},"PeriodicalIF":0.0,"publicationDate":"1975-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6589410/pdf/jres-79A-497.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37747698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 24
The Enthalpies of Combustion and Formation of Ortho- and Parafluorobenzoic Acid. 邻氟苯甲酸和对氟苯甲酸的燃烧焓和生成焓。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-05-01 DOI: 10.6028/jres.079A.011
Walter H Johnson, Edward J Prosen
{"title":"The Enthalpies of Combustion and Formation of Ortho- and Parafluorobenzoic Acid.","authors":"Walter H Johnson,&nbsp;Edward J Prosen","doi":"10.6028/jres.079A.011","DOIUrl":"https://doi.org/10.6028/jres.079A.011","url":null,"abstract":"<p><p>The enthalpies of combustion and formation of one sample of ortho- and two samples of parafluorobenzoic acids have been determined by combustion in an oxygen-bomb calorimeter. The data obtained by other investigators are discussed briefly. The values obtained and their estimated uncertainties are as follows: [Table: see text] where Δ<i>Hc</i>° corresponds to the reaction: <dispformula> <math> <mrow><msub><mtext>C</mtext> <mn>7</mn></msub> <msub><mtext>H</mtext> <mn>5</mn></msub> <msub><mtext>O</mtext> <mn>2</mn></msub> <mtext>F</mtext> <mo>(</mo> <mtext>c</mtext> <mo>)</mo> <mo>+</mo> <mn>7</mn> <msub><mtext>O</mtext> <mn>2</mn></msub> <mo>(</mo> <mtext>g</mtext> <mo>)</mo> <mo>+</mo> <mn>48</mn> <msub><mtext>H</mtext> <mn>2</mn></msub> <mtext>O</mtext> <mo>(</mo> <mtext>liq</mtext> <mo>)</mo> <mo>→</mo> <mn>7</mn> <msub><mrow><mtext>CO</mtext></mrow> <mn>2</mn></msub> <mo>(</mo> <mtext>g</mtext> <mo>)</mo> <mo>+</mo> <mrow><mo>[</mo> <mrow><mtext>HF</mtext> <mo>+</mo> <mn>50</mn> <msub><mtext>H</mtext> <mn>2</mn></msub> <mtext>O</mtext></mrow> <mo>]</mo></mrow> <mo>(</mo> <mtext>liq</mtext> <mo>)</mo> <mo>.</mo></mrow> </math></dispformula>.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 3","pages":"481-486"},"PeriodicalIF":0.0,"publicationDate":"1975-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6589408/pdf/jres-79A-481.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37746775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
The Enthalpies of Combustion and Formation of Cholesterol [cholest-5-en-3-ol (3 β )]. 胆固醇的燃烧和生成焓[胆固醇-5-烯-3-醇(3 β)]。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-05-01 DOI: 10.6028/jres.079A.013
Walter H Johnson
{"title":"The Enthalpies of Combustion and Formation of Cholesterol [cholest-5-en-3-ol (3 <sub><i>β</i></sub> )].","authors":"Walter H Johnson","doi":"10.6028/jres.079A.013","DOIUrl":"https://doi.org/10.6028/jres.079A.013","url":null,"abstract":"<p><p>The enthalpy of combustion of cholesterol was measured in an adiabatic, rotating-bomb calorimeter capable of high precision with relatively small samples. The random error for the experimental measurements was 0.006 percent which may be compared with approximately 0.3 percent for prior investigations on this substance. The results obtained for the enthalpy of combustion and the derived enthalpy of formation together with the estimated overall uncertainties are: <dispformula> <math><mrow><mi>Δ</mi> <mi>H</mi> <msup><mi>c</mi> <mo>°</mo></msup> <mrow><mo>(</mo> <mrow> <msup><mrow><mn>25</mn></mrow> <mo>°</mo></msup> <mtext>C</mtext></mrow> <mo>)</mo></mrow> <mo>=</mo> <mo>-</mo> <mn>16524.0</mn> <mo>±</mo> <mn>3.9</mn> <mspace></mspace> <mtext>kJ/mol</mtext></mrow> </math> </dispformula> <dispformula> <math><mrow><mi>Δ</mi> <mi>H</mi> <msup><mi>f</mi> <mo>°</mo></msup> <mrow><mo>(</mo> <mrow> <msup><mrow><mn>25</mn></mrow> <mo>°</mo></msup> <mtext>C</mtext></mrow> <mo>)</mo></mrow> <mo>=</mo> <mo>-</mo> <mn>674.8</mn> <mo>±</mo> <mn>4.1</mn> <mspace></mspace> <mtext>kJ/mol</mtext></mrow> </math> </dispformula> The results of prior investigations are discussed briefly.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 3","pages":"493-496"},"PeriodicalIF":0.0,"publicationDate":"1975-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6589411/pdf/jres-79A-493.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37746777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
The Enthalpies of Combustion and Formation of Acetanilide and Urea. 乙酰苯胺和尿素的燃烧焓和生成焓。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-05-01 DOI: 10.6028/jres.079A.012
Walter H Johnson
{"title":"The Enthalpies of Combustion and Formation of Acetanilide and Urea.","authors":"Walter H Johnson","doi":"10.6028/jres.079A.012","DOIUrl":"10.6028/jres.079A.012","url":null,"abstract":"<p><p>The enthalpies of combustion of acetanilide and urea have been determined in an oxygen-bomb calorimeter. The following values and their estimated uncertainties were obtained. [Table: see text].</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 3","pages":"487-491"},"PeriodicalIF":0.0,"publicationDate":"1975-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6589409/pdf/jres-79A-487.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37747699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal Conductivity of Gases. III. Some Values of the Thermal Conductivities of Argon, Helium, and Nitrogen from 0 °C to 75 °C at Pressures of 1 × 105 to 2.5 × 107 Pascals. 气体的导热性。3在1 × 105 ~ 2.5 × 107帕斯卡压力下，0 ~ 75℃范围内氩、氦、氮的热导率的一些数值。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-03-01 DOI: 10.6028/jres.079A.005
Leslie A Guildner
{"title":"Thermal Conductivity of Gases. III. Some Values of the Thermal Conductivities of Argon, Helium, and Nitrogen from 0 °C to 75 °C at Pressures of 1 × 10<sup>5</sup> to 2.5 × 10<sup>7</sup> Pascals.","authors":"Leslie A Guildner","doi":"10.6028/jres.079A.005","DOIUrl":"https://doi.org/10.6028/jres.079A.005","url":null,"abstract":"<p><p>Accurate measurements of the thermal conductivities of Ar and He agree with the theoretical value of 2.5 <i>ϕηc</i> <sub><i>v</i></sub> (<i>η</i> = viscosity, <i>c</i> <sub><i>v</i></sub> = specific heat capacity at constant volume <i>ϕ</i> is a number slightly greater than 1 depending upon the intermolecular potential). Measurements of the thermal conductivities of N<sub>2</sub> at 9.6 and 75 °C as a function of pressure up to 2.53 × 10<sup>7</sup> Pa help to appraise the validity of other measurements of the thermal conductivities of dense gases. The excess conductivity of nitrogen (the additional conductivity resulting from pressure) is shown to be a function of only the density of the nitrogen from 0 to 700 °C and pressures up to 1.3 × 10<sup>8</sup> Pa.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 2","pages":"407-413"},"PeriodicalIF":0.0,"publicationDate":"1975-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6565413/pdf/jres-79A-407.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37746768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Heat Capacities of Polyethylene III. One Linear and One Branched Sample from 5 to 350 K. 聚乙烯的热容量III.从5到350K的一个线性和一个分支样品。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-03-01 DOI: 10.6028/jres.079A.010
Shu-Sing Chang, Edgar F Westrum, H Gary Carlson
{"title":"Heat Capacities of Polyethylene III. One Linear and One Branched Sample from 5 to 350 K.","authors":"Shu-Sing Chang,&nbsp;Edgar F Westrum,&nbsp;H Gary Carlson","doi":"10.6028/jres.079A.010","DOIUrl":"10.6028/jres.079A.010","url":null,"abstract":"<p><p>Heat capacities of two polyethylene samples, one linear with a density of 0.973 g cm<sup>-3</sup> and one branched with a density of 0.91 g cm<sup>-3</sup>, have been determined by adiabatic calorimetry from 5 to 360 K in a different experimental arrangement then employed for studies of other polyethylene samples in this series. The heat capacity behavior of these two samples confirms expectations for samples with corresponding densities.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 2","pages":"437-441"},"PeriodicalIF":0.0,"publicationDate":"1975-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6565414/pdf/jres-79A-437.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37746774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
On the Differential Cross Section for X-Ray Inelastic Scattering. 关于x射线非弹性散射的微分截面。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-03-01 DOI: 10.6028/jres.079A.006
Masao Kuriyama
{"title":"On the Differential Cross Section for X-Ray Inelastic Scattering.","authors":"Masao Kuriyama","doi":"10.6028/jres.079A.006","DOIUrl":"https://doi.org/10.6028/jres.079A.006","url":null,"abstract":"<p><p>A formal formulation of the differential cross section for x-ray inelastic scattering is given for a real solid, in particular, in terms of the polarization propagator and the inverse dielectric function. The differential cross section is related to the causal functions of electron properties rather than those retarded functions.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 2","pages":"415-417"},"PeriodicalIF":0.0,"publicationDate":"1975-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6565416/pdf/jres-79A-415.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37746770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simplification of van der Poel's Formula for the Shear Modulus of a Particulate Composite. 颗粒复合材料剪切模量van der Poel公式的简化。
Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1975-03-01 DOI: 10.6028/jres.079A.007
Jack C Smith
{"title":"Simplification of van der Poel's Formula for the Shear Modulus of a Particulate Composite.","authors":"Jack C Smith","doi":"10.6028/jres.079A.007","DOIUrl":"10.6028/jres.079A.007","url":null,"abstract":"<p><p>The coefficients in van der Poel's equation for calculating the shear modulus of a particulate composite have been greatly simplified, making the calculation much less unwieldy. Approximate solutions of van der Poel's equation are also derived, and it is shown that one of the low order approximations is Kernels equation, or Mashin and Shtrikman's equation for the highest lower hound. The Kerner approximation is often too low in value when the volume fraction of filler exceeds 0.2, but it can he used to provide further simplification in van der Poel's equation, or it can be used as a first approximation in a Newton's method of solution.</p>","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"79A 2","pages":"419-423"},"PeriodicalIF":0.0,"publicationDate":"1975-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6565412/pdf/jres-79A-419.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37746776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 96
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