of Research of the National Bureau of Standards Grid Plate Calibration at the National Bureau of Standards January - February 1988
نویسنده
چکیده
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 absolute accuracy of the calibrations are presented.
منابع مشابه
pH standards at various temperatures; aqueous solutions of acid potassium phthalate.
pH values of aqueous solutions of acid potassium phthalate, National Bureau of Standards Standard Sample 84a, are given for concentrations from 0.001 to 0.2 m and for temperatures between 0° and 60° C. They were calculated from the values of the two dissociation constants of o-phthalic acid and the activity coefficients of the acid phthalate and phthalate ions. The pH values range from 3.88 to ...
متن کاملAnalysis of Genetic Diversity in Berari Goat Population of Maharashtra State
Berari goats are medium sized animals reared mainly for meat purpose. They are predominantly brown and blackish brown in colour with glossy hair and found in Vidarbha region of Maharashtra state. Berari is not a recognized breed but a well established local population of goat which is yet to be fully explored for its phenotypic and genetic aspects. Within population genetic variation was examin...
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تاریخ انتشار 2010