منابع مشابه
Anchor Modeling
Did you know that some of the earliest prerequisites for data warehousing were set over 2500 years ago. It is called an anchor model since the anchors tie down a number of attributes (see picture above). All EER-diagrams have been made with Graphviz. All cats are drawn by the author, Lars Rönnbäck. 2 2 You can never step into the same river twice. 2 The great greek philosopher Heraclitus said "...
متن کاملAnchor 2005
Flow tracking is an integral aspect of many network-related applications, including intrusion detection, network administration, per-flow billing, and network engineering. While some applications do not require precise tracking of every packet or flow and successfully employ statistical sampling or approximations to achieve an acceptable level of accuracy, many others, especially in the securit...
متن کاملCilia drop anchor
Cilia hoist dust out of the lungs, propel sperm toward the egg, and enable us to catch the scent of fresh coffee. The structures also help some cells attach to their surroundings, Schouteden et al. reveal (1). A cilium is built around the axoneme, an internal shaft of microtubules that sprouts from a structure known as the basal body. Between the axoneme and the basal body lies the transition z...
متن کاملLeukocytes drop anchor
B urkart et al. describe how a secreted protease helps egg cells avoid being fertilized by more than one sperm. Because polyspermy disrupts em-bryonic development, oocytes take several steps to ensure they only fuse with a single sperm. One key step is to prevent additional sperm from binding to the surface of an already-fertilized egg, a blockade that involves the release of secretory granules...
متن کاملSpring Frosts statistical - Synoptic Analysis (Case Study: Kermanshah Province)
Agricultural crops have damaged a lot due to the aftermath of late spring frost, and because low temperatures have damaging effects on agricultural production, it is essential to anticipate and prevent potential damages. Often, atmospheric temperature variations are very urgent due to the high temperature of the systems and the plants cannot adapt themselves with severe oscillations and, have b...
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ژورنال
عنوان ژورنال: Nature
سال: 1886
ISSN: 0028-0836,1476-4687
DOI: 10.1038/033269b0