نتایج جستجو برای: through its evolution
تعداد نتایج: 3267072 فیلتر نتایج به سال:
We investigate the generation of large scale magnetic fields in the universe from quantum fluctuations that are produced in the inflationary stage. By coupling these quantum fluctuations to the dilaton field and Ricci scalar, we show that the magnetic fields with the strength observed today can be produced. We consider two situations. First, the evolution of dilaton ends by starting the reheat...
Observations of the stellar initial mass function are reviewed. The IMF is flat, or possibly declining, below several tenths of a Solar mass, and declining above this mass in a power law with a slope of about −1.35 on a log-log plot. The flattening at low mass is evidence for a characteristic mass in star formation, which, according to recent theory, may be either the minimum stellar mass for t...
In this paper, we first study the conditions for the existence of the solitonic solutions in ion-electron-positron plasma. Then we investigate the effect of increasing positron on the solitonic wave properties, We also consider the time evolution of these waves in passing through the boundaries of two plasma with different positron densities and different positron-electron temperature ratios.
Human language, over its evolutionary history, has emerged as one of the fundamental defining characteristic of the modern man. However, this milestone evolutionary process through natural selection has not left any ’linguistic fossils’ that may enable us to trace back the actual course of development of language and its establishment in human societies. Lacking analytical tools to fathom the cr...
The paper highlights events of manufacturing’s evolution and metamorphosis over a period of 60 years (as noted by the first author) and offers some observations on key developments and activities. It includes, principally, the reflections of professional activities of the first author and discussions of how manufacturing is evolving to accommodate the current and expected trends in manufacturin...
the goal of the study was analyzing the conceptual relationship between utopianism and education evolution. the study was conducted analytically relying on reviewing and deriving relevant targeted information. they were derived and categorized from reliable sources. to conduct this, at first it was conceptualized the utopia and then was reviewed the thoughts of the most famous utopians: plato, ...
Formation and historical course of Islamic Mysticism and Sufism from beginning to seventh century AH
Mysticism and Sufism have a long precedent during the history and have been appeared in the form of different manners throughout divine religions. Islamic mysticism has been experienced many changes from the beginning to the seventh century AH. This research employs Descriptive-Analytic approach for explaining the origin of Islamic Mysticism, studies its evolutions in intended periods and inves...
discussion about islamic culture and civilization and elements of its evolution and development is complex and needs comprehensive review. why and how islam emerged among arabs who in comparison with other nations had not enjoyed considerable background and civilization and could develop and unite them, is a basic issue and deserves a separate review. but the issue that development and evolutio...
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