: Prehistoire de l'art occidental . Andre Leroi-Gourhan.
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Armand Leroi
widespread decisions, such as how a group of primates decide where to travel after a rest period or how a flock of birds decides when to leave a foraging patch. “Unless all members decide on the same action, some will be left behind and will forfeit, at least temporarily, the advantages of group living,” they write. “Thus, in order to maintain group cohesion, social animals — like humans — have...
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In 1943 Quick (1) reported on the multiple nature of plasma prothrombin. On the basis of his data, which have been repeatedly confirmed (24), he concluded that prothrombin consists of two essential factors combined with calcium. The two components, "prothrombin A" and "prothrombin B," had different properties. The former was labile in oxalated or citrated plasma stored at refrigerator temperatu...
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Stochastic delay differential equations allow the stochastic differential equations to incorporate past data segments. They are widely used to solve systems having delay feedbacks. In the linear Gaussian case, the differential equations can be solved by computing the covariance functions through the double Laplace transform. It turns out that the solution can be decomposed into the sum of indep...
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Interaction of intense ultrashort (few-cycle) laser pulses with atoms and molecules leads to a highly nonlinear nonperturbative regime of electron dynamics and response. Ionized electrons are shown to be controlled by such pulses and the response is described by simple classical models of under and above barrier ionization followed by recollision with the parent ion or collision with neighborin...
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In his massive multi-volume work Technics and Time Bernard Stiegler explores a history of technics as epiphylogenesis—the preservation in technical objects of epigenetic experience. Epiphylogenesis for Stiegler marks a break with genetic evolution (which cannot preserve the lessons of experience), a break which also constitutes the “invention” of the human. As Stiegler puts it in the general in...
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ژورنال
عنوان ژورنال: American Anthropologist
سال: 1966
ISSN: 0002-7294,1548-1433
DOI: 10.1525/aa.1966.68.6.02a00670