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of 147
pro vyhledávání: '"Pratt, J. R."'
Measuring gravitational interactions on sub-100-$\mu$m length scales offers a window into physics beyond the Standard Model. However, short-range gravity experiments are limited by the ability to position sufficiently massive objects to within small
Externí odkaz:
http://arxiv.org/abs/2406.13020
Autor:
Haddad, D., Seifert, F., Chao, L. S., Possolo, A., Newell, D. B., Pratt, J. R., Williams, C. J., Schlamminger, S.
Publikováno v:
Metrologia 54 (2017) 633-641; http://iopscience.iop.org/article/10.1088/1681-7575/aa7bf2
Researchers at the National Institute of Standards and Technology(NIST) have measured the value of the Planck constant to be $h =6.626\,069\,934(89)\times 10^{-34}\,$J$\,$s (relative standard uncertainty $13\times 10^{-9}$). The result is based on ov
Externí odkaz:
http://arxiv.org/abs/1708.02473
Autor:
Haddad, D., Seifert, F., Chao, L. S., Cao, A., Sineriz, G., Pratt, J. R., Newell, D. B., Schlamminger, S.
In early 2014, construction of a new watt balance, named NIST-4, has started at the National Institute of Standards and Technology (NIST). In a watt balance, the gravitational force of an unknown mass is compensated by an electromagnetic force produc
Externí odkaz:
http://arxiv.org/abs/1503.04656
Autor:
Schlamminger, S., Steiner, R. L., Haddad, D., Newell, D. B., Seifert, F., Chao, L. S., Liu, R., Williams, E. R., Pratt, J. R.
Researchers at the National Institute of Standards and Technology have been using a watt balance, NIST-3, to measure the Planck constant $h$ for over ten years. Two recently published values disagree by more than one standard uncertainty. The motivat
Externí odkaz:
http://arxiv.org/abs/1501.06796
Autor:
Leaman, E. J., Haddad, D., Seifert, F., Chao, L. S., Cao, A., Pratt, J. R., Schlamminger, S., Newell, D. B.
A new watt balance is being constructed at the National Institute of Standards and Technology (NIST) in preparation for the redefinition of the International System of Units and the realization of mass through an exact value of the Planck constant. T
Externí odkaz:
http://arxiv.org/abs/1412.4143
Autor:
Chao, L. S., Schlamminger, S., Newell, D. B., Pratt, J. R., Seifert, F., Zhang, X., Sineriz, G., Liu, M., Haddad, D.
A global effort to redefine our International System of Units (SI) is underway and the change to the new system is expected to occur in 2018. Within the newly redefined SI, the present base units will still exist but be derived from fixed numerical v
Externí odkaz:
http://arxiv.org/abs/1412.1699
Publikováno v:
Ecological Applications, 1997 Nov 01. 7(4), 1117-1124.
Externí odkaz:
https://www.jstor.org/stable/2641200
Akademický článek
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Publikováno v:
The American Midland Naturalist, 1985 Jan 01. 113(1), 92-101.
Externí odkaz:
https://www.jstor.org/stable/2425351
Publikováno v:
Transactions of the American Microscopical Society, 1988 Jul 01. 107(3), 259-268.
Externí odkaz:
https://www.jstor.org/stable/3226502