Balance 1998
نویسندگان
چکیده
منابع مشابه
Details of the 1998 Watt Balance Experiment Determining the Planck Constant
The National Institute of Standards and Technology (NIST) watt balance experiment completed a determination of Planck constant in 1998 with a relative standard uncertainty of 87 × 10(-9) (k = 1), concurrently with an upper limit on the drift rate of the SI kilogram mass standard. A number of other fundamental physical constants with uncertainties dominated by this result are also calculated. Th...
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In this paper we examine how the di erences in modelling between di erent data driven systems performing the same NLP task can be exploited to yield a higher accuracy than the best indi vidual system We do this by means of an ex periment involving the task of morpho syntactic wordclass tagging Four well known tagger gen erators Hidden Markov Model Memory Based Transformation Rules and Maximum E...
متن کاملNews - 11 april 1998
1111 BMJ VOLUME 316 11 APRIL 1998 www.bmj.com The largest study yet to be carried out on serum screening for Down’s syndrome has shown that it can be performed accurately during the first trimester of pregnancy, confirming previous findings and backing the opinion of many leading specialists that tests should be carried out earlier. The study, carried out in the United States, screened 4412 pre...
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ژورنال
عنوان ژورنال: Salud Pública de México
سال: 1999
ISSN: 0036-3634
DOI: 10.1590/s0036-36341999000100008