منابع مشابه
Jolly SAD.
Examples of phasing macromolecular crystal structures based on single-wavelength anomalous dispersion (SAD) show that this approach is more powerful and may have more general application in structural biology than was anticipated. Better data-collection facilities and cryogenic techniques, coupled with powerful programs for data processing, phasing, density modification and automatic model buil...
متن کاملAIDS and Africa: still a sad story.
www.sciencemag.org SCIENCE VOL 300 16 MAY 2003 1053 T here was good news earlier this year about one of the world’s most threatening public health problems. In his State of the Union message to the U.S. Congress, President Bush announced a commitment of $15 billion to combat the AIDS epidemic in Africa. It was a surprise, and a source of hope, for those of us who have believed that this tragedy...
متن کاملSeasonal affective disorder (SAD)?
Every winter, especially when the days are short, I feel tired, depressed, and unproductive. Then the spring comes and I start feeling myself again. Is this just a normal seasonal cycle? I've heard about SAD, Seasonal Affective Disorder, but don't know much about it. Answer Dear Melancholy Baby, Somebody must've been feeling a bit clever when they christened the wintertime blues with the acrony...
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Abstract- Text classification is one of the main tasks of natural language processing (NLP). In this task, documents are classified into pre-defined categories. There is lots of news spreading on the web. A text classifier can categorize news automatically and this facilitates and accelerates access to the news. The first step in text classification is to represent documents in a suitable way t...
متن کاملStochastic Differential Equations: A SAD Primer
1 The Wiener Process The stochastic process W t is a Wiener Process if its increments are normally distributed: W t − W s ∼ N (0, t − s) (1) and are independent if non-overlapping: E{(W t 1 − W s 1)(W t 2 − W s 2)} = 0 if (s 1 , t 1) ∩ (s 2 , t 2) = ∅ (2) In particular, we have E{W t − W s } = 0 (3) E{(W t − W s) 2 } = t − s (4) Furthermore, if we fix the initial value of the process to be zero...
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ژورنال
عنوان ژورنال: BMJ
سال: 1979
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.2.6194.844