منابع مشابه
The Life-Spans of Empires
The collapse of empires is exceedingly difficult to understand. The author examined the distribution of imperial lifetimes using a data set that spans more than three millennia and found that it conforms to a memoryless exponential distribution in which the rate of collapse of an empire is independent of its age. Comparing this distribution to similar lifetime distributions of other complex sys...
متن کاملSafe in the Sun
سرطانهای جلدی را می توان به انواع پیش بدخیم و بدخیم تقسیم نمود. شایعترین ضایعه جلدی پیش بدخیم، کراتوز آفتابی نام دارد که بصورت ضایعات خشک و دلمه دار جلدی بروز می کنند - لنتیگو آفتابی یک ضایعه پیش بدخیم دیگرن است که بصورت لکه های قهوه ای و صاف (غیر برجسته روی پوست مشاهده می شوند) ضایعات پیش بدخیم در صورت عدم درمان می توانند بدخیم شوند.
متن کاملTwo empires or three?
In the last 100 years, several spectacular discoveries were made in the world of biodiversity, discoveries such as the Okapi in the Congo forest, the only living relative of the giraffes, or Latimeria in the Indian Ocean, a living coelacanth fish, believed to have been extinct for 60 million years. But these were merely small white spots on the world map of biodiversity. By contrast, Carl Woese...
متن کاملBulletin comment: Ever-expanding empires†
the highest level ought to be based on sound information, research or expert advice. Further, once change has been implemented and new practices set up there needs to be ongoing assessment, monitoring and reflection on the relative merits of the situation. Depending on the findings it might be necessary to make further changes: sometimes these alterations may even result in a complete reversal ...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Cosmopolitan Civil Societies: An Interdisciplinary Journal
سال: 2011
ISSN: 1837-5391
DOI: 10.5130/ccs.v3i1.1850