Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry最新文献

Vapor Pressure Formulation for Water in Range 0 to 100 °C. A Revision. 0 至 100 °C 范围内水的蒸汽压公式。A 修订版。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-09-01 Epub Date: 1976-10-01 DOI: 10.6028/jres.080A.071

Arnold Wexler

引用次数: 0

Deviation of International Practical Temperatures from Thermodynamic Temperatures in the Temperature Range from 273.16 K to 730 K. 国际实用温度与 273.16 K 至 730 K 温度范围内热力学温度的偏差。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-09-01 Epub Date: 1976-10-01 DOI: 10.6028/jres.080A.068

L A Guildner, R E Edsinger

{"title":"Deviation of International Practical Temperatures from Thermodynamic Temperatures in the Temperature Range from 273.16 K to 730 K.","authors":"L A Guildner, R E Edsinger","doi":"10.6028/jres.080A.068","DOIUrl":"10.6028/jres.080A.068","url":null,"abstract":"The range over which thermodynamic temperatures have been realized by gas thermometry at the NBS has been extended to 730 K. The results are preserved by measuring the corresponding international practical temperatures. The difference between them is expressed as the following polynomial: <dispformula> <math><mrow><mi>T</mi> <mo>/</mo> <mi>K</mi> <mo>-</mo> <msub><mi>T</mi> <mrow><mn>68</mn></mrow> </msub> <mo>/</mo> <msub><mi>K</mi> <mrow><mn>68</mn></mrow> </msub> <mo>=</mo> <mo>-</mo> <mn>120</mn> <mo>,</mo> <mn>887.784</mn> <mo>/</mo> <msubsup><mi>T</mi> <mrow><mn>68</mn></mrow> <mn>2</mn></msubsup> <mo>+</mo> <mn>1213.53295</mn> <mo>/</mo> <msub><mi>T</mi> <mrow><mn>68</mn></mrow> </msub> <mo>-</mo> <mn>4.3159552</mn> <mo>+</mo> <mn>6.44075647</mn> <mo>×</mo> <msup><mrow><mn>10</mn></mrow> <mrow><mo>-</mo> <mn>3</mn></mrow> </msup> <msub><mi>T</mi> <mrow><mn>68</mn></mrow> </msub> <mo>-</mo> <mn>3.56638846</mn> <mo>×</mo> <msup><mrow><mn>10</mn></mrow> <mrow><mo>-</mo> <mn>6</mn></mrow> </msup> <msubsup><mi>T</mi> <mrow><mn>68</mn></mrow> <mn>2</mn></msubsup> </mrow> </math> </dispformula> which is valid in the range 273 to 730 K. The difference found and the estimated uncertainties at the three defining fixed points in the range covered are [Table: see text].","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"80A 5-6","pages":"703-738"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5312757/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37757426","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

Phase Equilibria and Crystal Growth in the Alkali Antimonate Systems Sb₂O₄-NaSbO_3/ Sb₂O₄-KSbO_3/, and Sb₂O₄-NaSbO₃-NaF. 碱锑酸盐体系Sb2O4-NaSbO3/ Sb2O4-KSbO3/和Sb2O4-NaSbO3- naf的相平衡和晶体生长

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-09-01 Epub Date: 1976-10-01 DOI: 10.6028/jres.080A.070

J L Waring, R S Roth, H S Parker, W S Brower

{"title":"Phase Equilibria and Crystal Growth in the Alkali Antimonate Systems Sb2O4-NaSbO3/ Sb2O4-KSbO3/, and Sb2O4-NaSbO3-NaF.","authors":"J L Waring, R S Roth, H S Parker, W S Brower","doi":"10.6028/jres.080A.070","DOIUrl":"https://doi.org/10.6028/jres.080A.070","url":null,"abstract":"Phase equilibrium diagrams have been constructed from experimental data for the systems Sb2O4-NaSbO3, Sb2O4-KSbO3, and Sb2O4-NaSbO3-NaF. The system Sb2O4-NaSbO3 contains only an intermediate pyrochlore type solid solution with a maximum melting point of 1490 °C at a Na:Sb atom ratio of 3:5. The Sb2O4-KSbO3 system contains in addition to the pyrochlore phase a compound 3K2O • 5Sb2O5 which melts congruently at about 1450 °C and two polymorphs of K2O • 2Sb2O5. The low temperature form of K2O • 2Sb2O5 was found to be monoclinic P21/c with a = 7.178, b = 13.378, c = 11.985 A, β = 124°10'. The melting point of Sb2O4 was found to be 1350 ± 5 °C and NaSbO3 and KSbO3 both melt congruently at 1555 ± 5 °C and 1410 ± 5 °C respectively. The previously reported cubic form of KSbO3 was found to be a K+ deficient phase stabilized by reaction with atmospheric moisture. A similar cubic phase which appears to be a good Na+ ion conductor can be synthesized in the ternary system NaSbO3-Sb2O4-NaF.","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"80A 5-6","pages":"761-774"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5312759/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37757428","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

Revised Lifetimes of Energy Levels in Neutral Iron. 中性铁中能级的修订寿命。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-09-01 Epub Date: 1976-10-01 DOI: 10.6028/jres.080A.072

C H Corliss, J L Tech

引用次数: 0

Measurements of the Specific Heats, C_σ , and C_v of Dense Gaseous and Liquid Ethane^. 测量浓稠气态和液态乙烷的比热、Cσ 和 Cv。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-09-01 Epub Date: 1976-10-01 DOI: 10.6028/jres.080A.069

Hans M Roder

引用次数: 0

Understanding Bidirectional Reflectance and Transmission for Space Applications. 了解空间应用的双向反射和传输。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-07-01 Epub Date: 1976-08-01 DOI: 10.6028/jres.080A.058

John B Schutt

引用次数: 0

Standardization in Transmission Spectrophotometry in the Visible and Ultraviolet Spectral Regions. 可见光和紫外光谱透射分光光度法的标准化。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-07-01 Epub Date: 1976-08-01 DOI: 10.6028/jres.080A.061

A R Robertson

{"title":"Standardization in Transmission Spectrophotometry in the Visible and Ultraviolet Spectral Regions.","authors":"A R Robertson","doi":"10.6028/jres.080A.061","DOIUrl":"10.6028/jres.080A.061","url":null,"abstract":"In an instrument as complex as a spectrophotometer there are many potential sources of error. Because of this it is useful to have available standard materials whose spectral transmittances are known accurately. Periodic measurement of such standards provides a useful indication of whether a spectrophotometer is producing accurate results. If the spectral transmittance functions of these standards are chosen suitably, the measurements can provide diagnostic information to indicate what type of error is occurring. Among the factors that most often lead to errors in spectrophotometry are the slit-width, the wavelength scale, the photometric scale, and stray radiation. Suitable material standards can provide indications of the occurrence of these errors. However it is sometimes difficult to identify a particular error since often several errors will occur at the same time. Several sets of standards for testing spectrophotometers are available or can be constructed easily. Most of these are glass filters, but interference filters, perforated screens, and rotating sectors are also used. Liquid filters have some advantages, especially in the ultraviolet where glass filters absorb too strongly to be useful. However difficulties in preparing and handling liquid filters can introduce uncertainties. It is important that standard materials are insensitive to environmental conditions (such as temperature) and that they are stable over a long period of time. Unfortunately, many of the materials with the most suitable spectral characteristics are least suitable in these respects, and it would be very useful if new and better materials could be developed.","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"80A 4","pages":"625-630"},"PeriodicalIF":0.0,"publicationDate":"1976-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5293528/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37757475","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

A Self-Balancing Nanovolt Potentiometric System for Thermometry and Calorimetry. 一种用于测温量热的自平衡纳伏电位计系统。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-07-01 Epub Date: 1976-08-01 DOI: 10.6028/jres.080A.067

Shu-Sing Chang

引用次数: 3

Standardization of Light Scattering Measurement in Conjunction With Immunochemical Analysis. 结合免疫化学分析的光散射测量标准化。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-07-01 Epub Date: 1976-08-01 DOI: 10.6028/jres.080A.059

Gregory J Buffone

{"title":"Standardization of Light Scattering Measurement in Conjunction With Immunochemical Analysis.","authors":"Gregory J Buffone","doi":"10.6028/jres.080A.059","DOIUrl":"10.6028/jres.080A.059","url":null,"abstract":"Light scattering methods for the physical analysis of synthetic and biological polymers necessitates the use of scattering standards and absolute light scattering measurements. Standardization has not been employed when light scattering has been used to monitor immunochemical reactions using a kinetic or thermodynamic mode. The concentration of a specific protein present in a complex matrix such as urine, serum or cerebrospinal fluid, is measured by reacting the protein of interest with its specific antibody and then measuring the excess light scattering of the solution produced by the formation of antigen antibody complexes. The lack of established light scattering standards in the area of immunochemical measurements makes instrumental quality control difficult and has hindered direct comparison of data among investigators. Both solid and liquid light scattering standards would be necessary to encompass the wide range of instrumentation currently in use. Several solid standards which have been used in the past include reflecting diffusers such as vitrolite, magnesium carbonate crystals with a ground surface, magnesium oxide coatings on magnesium carbonate crystal, casein paint on vitrolite, and solid opal glass transmitting diffusers such as flashed opal glass and solid opal glass. These standards, while applicable to manual light scattering photometers, are not suitable for recently developed automated instrumentation. Liquid standards in the form of Ludox®, solutions of polystyrene, suspensions of small diameter latex spheres and even pure organic solvents could be used more easily with the continuous flow and discrete automated analyzers. The introduction of instrumental standards at this level of analysis would result in improved overall quality control and facilitate data and method comparison between laboratories.","PeriodicalId":17018,"journal":{"name":"Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry","volume":"80A 4","pages":"605-608"},"PeriodicalIF":0.0,"publicationDate":"1976-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5293526/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"37758487","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

Considerations for the Use of Semi-Transparent Metallic Thin Films as Potential Transmittance Standards in Spectrophotometry. 在分光光度法中使用半透明金属薄膜作为潜在透射率标准的考虑因素。

Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry Pub Date : 1976-07-01 Epub Date: 1976-08-01 DOI: 10.6028/jres.080A.063

R Mavrodineanu

引用次数: 0