منابع مشابه
Intensity statistics of Friedel opposites.
A previous analysis of the average intensity and mean-square intensity difference of Friedel opposites, confined to the space group P1 [Flack & Shmueli (2007). Acta Cryst. A63, 257-265], is here extended to all the non-centrosymmetric space groups. The present analysis presumes purely non-centrosymmetric content of the unit cell. An important result of this study is that the average intensity a...
متن کاملComment on Probability density functions of the average and difference intensities of Friedel opposites by Shmueli & Flack (2010).
An interesting article by Shmueli & Flack (2010) (referred to as S&F in the following) was published recently [Acta Cryst. A66, 669–675]. Part of this article is devoted to probability density functions (p.d.f.s) and simulations of Friedel intensity differences, upon which I would like to share some remarks: (1) Simulations presented in S&F are based on the assumption that h Rjk (Rjk 1⁄4 rj rk,...
متن کاملA cognitive approach to opposites:
In the present paper, opposites are examined and discussed, and a way of describing them from a cognitive perspective is suggested. Related research disagrees upon whether opposites are symmetrical, and whether concepts should be integrated in the relation of opposites. The Swedish opposites levande 'alive' and död 'dead' have been studied thoroughly in order to provide empirical data. Argument...
متن کاملasymptotic property of order statistics and sample quntile
چکیده: فرض کنید که تابعی از اپسیلون یک مجموع نامتناهی از احتمالات موزون مربوط به مجموع های جزئی براساس یک دنباله از متغیرهای تصادفی مستقل و همتوزیع باشد، و همچنین فرض کنید توابعی مانند g و h وجود دارند که هرگاه امید ریاضی توان دوم x متناهی و امیدریاضی x صفر باشد، در این صورت می توان حد حاصلضرب این توابع را بصورت تابعی از امید ریاضی توان دوم x نوشت. حالت عکس نیز برقرار است. همچنین ما با استفاده...
15 صفحه اولVariations in Intensity Statistics for Representational and
Two recent studies suggest that natural scenes and paintings show similar statistical properties. But does the content or region of origin of an artwork affect its statistical properties? We addressed this question by having judges place paintings from a large, diverse collection of paintings into one of three subject matter categories using a forced-choice paradigm. Basic statistics for images...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 2008
ISSN: 0108-7673
DOI: 10.1107/s0108767308013421