Absolute value of g at the National Bureau of Standards
نویسندگان
چکیده
منابع مشابه
of Research of the National Bureau of Standards Grid Plate Calibration at the National Bureau of Standards January - February 1988
National Bureau of Standards Gaithersburg, MD 20899 Grid plates are calibrated by a completely automated high precision measuring machine which uses a computer vision system to detect and locate the grid marks. The system routinely calibrates plates of up to 600x600 millimeters with accuracies of 0.5 micrometers. Descriptions of the system components, level of performance and tests of the absol...
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ارزش در معرض ریسک یکی از مهمترین معیارهای اندازه گیری ریسک در بنگاه های اقتصادی می باشد. برآورد دقیق ارزش در معرض ریسک موضوع بسیارمهمی می باشد و انحراف از آن می تواند موجب ورشکستگی و یا عدم تخصیص بهینه منابع یک بنگاه گردد. هدف اصلی این مطالعه بررسی کارایی روش copula-garch شرطی در برآورد ارزش در معرض ریسک پرتفویی متشکل از دو سهام می باشد و ارزش در معرض ریسک بدست آمده با روشهای سنتی برآورد ارزش د...
Computer Development at the National Bureau of Standards
The first fully operational stored-program electronic computer in the United States was built at the National Bureau of Standards. The Standards Electronic Automatic Computer (SEAC) [1] (Fig. 1.) began useful computation in May 1950. The stored program was held in the machine’s internal memory where the machine itself could modify it for successive stages of a computation. This made a dramatic ...
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In 1980, the research program in pH was re-established at the National Bureau of Standards (NBS). This report describes the state of this research, as well as the state of the NBS pH standards. The thermodynamic definition and the determination of pH are elaborated. The problems of liquid junction potentials encountered in the practical determination of pH are discussed. The goal of the researc...
متن کاملAn Absolute Calibration of the National Bureau of Standards Thermal Neutron Flux
The NBS Standard Thermal Neutron Flux has been calibrated in terms of the B(n, a) cross section [De Juren and Rosenwasser, 1954] and of the gold thermal neutron capture cross section [Mosburg and Murphey, 1961]. The present calibration, based on absolute counting of Au activity by the 4:ir@-y coincidence method, represents part of a program of international comparisons of thermal neutron flux d...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards, Section C: Engineering and Instrumentation
سال: 1966
ISSN: 0022-4316
DOI: 10.6028/jres.070c.013