منابع مشابه
A comparison with stirred beaker methods
The earliest dissolution apparata included Pernarowski’s basket dissolution assembly2 and Poole’s paddle design.3 Until recently, official dissolution testing methods were based entirely on modifications of these static models. However, these methods suffer from a number of disadvantages4 and the need for a new official dissolution test was recognised, resulting in the introduction of the flow-...
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Résumé. Cet article montre comment on peut utiliser la construction de Chu afin de simplifier la construction assez complexe de la catégorie ∗-autonome des boules qui sont réflexives et ζ-ζ∗-complètes donnée par le premier auteur dans les articles [Barr, 1976, 1979]. Abstract. This paper shows how the use of the “Chu construction” can simplify the rather complicated construction of the ∗-autono...
متن کاملCritical Balls
This paper introduces the concept of critical ball. Critical balls are maximal balls which are necessary and sufficient to describe and rebuild sets, contrary to maximal balls where some redundancy exists. A general definition of a critical ball is given in continuous spaces and some of its main properties are depicted. Thanks to a slight modification of their definition, critical balls can als...
متن کاملThe Beaker phenomenon and the genomic transformation of northwest Europe
During the third millennium bc, two new archaeological pottery styles expanded across Europe and replaced many of the more localized styles that had preceded them1. The expansion of the ‘Corded Ware complex’ in north-central and northeastern Europe was associated with people who derived most of their ancestry from populations related to Early Bronze Age Yamnaya pastoralists from the Eurasian st...
متن کاملThe Beaker phenomenon and the genomic transformation of northwest Europe
During the third millennium bc, two new archaeological pottery styles expanded across Europe and replaced many of the more localized styles that had preceded them1. The expansion of the ‘Corded Ware complex’ in north-central and northeastern Europe was associated with people who derived most of their ancestry from populations related to Early Bronze Age Yamnaya pastoralists from the Eurasian st...
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ژورنال
عنوان ژورنال: The Physics Teacher
سال: 2016
ISSN: 0031-921X
DOI: 10.1119/1.4937962