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تعداد نتایج: 5799519 فیلتر نتایج به سال:
In conventional solid-state photovoltaics, electron-hole pairs are created by light absorption in a semiconductor and separated by the electric field spaning a micrometre-thick depletion region. The maximum voltage these devices can produce is equal to the semiconductor electronic bandgap. Here, we report the discovery of a fundamentally different mechanism for photovoltaic charge separation, w...
In this article we present s1, a family of logics that is useful to disprove propositional formulas by means of an anytime approximation process. The systems follows the paradigm of a parameterized family of logics established by Schaerf’s and Cadoli’s system S1. We show that s1 inherits several of the nice properties of S1, while presenting several attractive new properties. The family s1 deal...
phatic communion is a cultural concept which differs across cultures. according to hofstede (2001), the u.s. tends to have individualistic culture; however, asian countries tend to have collectivistic cultures. these cultures view phatic communion differently. in individualistic cultures like u.s., phatic communion reflects speakers’ socio-cultural relationships in conversations. to see whether...
based on the epistemological theory of islamic reformism which is an important school of thought in the muslim world, in order to gain or construct an authentic knowledge, the interaction between reason and religion is a necessity. this theory faces with two main theoretical challenges. the first challenge is the position of modernists toward this theory. they argue that this theory is in contr...
turmeric from traditional medicine point of view jajvandian. r [1] abstract introduction: turmeric (curcuma longa) has been considered as a plant with special place in traditional medicine. this permanent plant has about 1.5 meters height with basal leaves of pedicle and specified sheat without petiole, and the flowers are hyacinthine covered with two yellowish green brackets. some tu...
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