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81.
This paper presents the theoretical basis and first results of an agent-based model (ABM) computer simulation that is being developed to explore cooperation in hunter–gatherer societies. Specifically, we focus here on Yamana, a hunter-fisher-gatherer society that inhabited the islands of the southernmost part of Tierra del Fuego (Argentina–Chile). Ethnographical and archaeological evidence suggests the existence of sporadic aggregation events, triggered by a public call through smoke signals of an extraordinary confluence of resources under unforeseeable circumstances in time and space (a beached whale or an exceptional accumulation of fish after a low tide, for example). During these aggregation events, the different social units involved used to develop and improve production, distribution and consumption processes in a collective way. This paper attempts to analyse the social dynamics that explain cooperative behaviour and resource-sharing during aggregation events using an agent-based model of indirect reciprocity. In brief, agents make their decisions based on the success of the public strategies of other agents. Fitness depends on the resource captured and the social capital exchanged in aggregation events, modified by the agent’s reputation. Our computational results identify the relative importance of resources with respect to social benefits and the ease in detecting—and hence punishing—a defector as key factors to promote and sustain cooperative behaviour among population.  相似文献   
82.
This article studies the correct generic framing of an early work of Lope de Vega,Los comendadores de Córdoba, which has attracted recent criticism, in part because the structure of tragedy is undermined by numerous laughable and grotesque elements. It therefore seems to be a play characterized by failure to follow the path of a specific genre. This article tries to overcome this problem by studying the relationship between gender and violence.  相似文献   
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84.
Actors within an ecology of games in a polycentric governance system have to choose from a large number of forums they could participate in. This article analyzes why given types of forums are important to actors, as compared to other forums. It shows that functions of an ecology of games, such as cooperation, learning, and resource distribution, influence the importance that actors attribute to forums. The empirical analysis focuses on cross‐sectoral forums, a particular type of forum that is specialized in coordination among actors from different societal sectors, such as government, private interest, or science. Analysis of survey data from eight cross‐sectoral forums in Swiss habitat and land use governance and their 159 members shows that cross‐sectoral forums are comparatively important to actors that perceive their forum to contribute to learning and resource distribution.  相似文献   
85.
In this article, we construct new, simple, and nonparametric tests for spatial independence using symbolic analysis. An important aspect is that the tests are free of a priori assumptions about the functional form of dependence, making them especially suitable in situations where the dependence is nonlinear. We define the concept of a similarity relation, which is used to keep track of similarity between neighboring observations. This similarity count is used to construct new statistical tests based on both random permutation simulations and derived asymptotic distributions. We include a Monte Carlo study to better illustrate the properties and the behavior of the new tests under several synthetically generated processes. Apart from being competitive compared with other nonparametric and parametric tests, results underline the outstanding power of the new tests for nonlinear‐dependent spatial processes.  相似文献   
86.
In 1973, while recovering copper cargo from a 20th‐century ship wrecked off the Ponta do Leme Velho on the south‐east side of Sal Island, Cape Verde, explosives revealed an earlier ship cargo with dozens of Portuguese faience plates and bowls, glass beads and metal objects, including buckles, ammunition and copper manillas. The assemblage, including the ceramics and a marked silver tastevin, provide a site date between 1680 and 1700. The research presented here is a result of collaboration between CPAS and the authors in 2008 to analyse this assemblage in the context of late 17th‐century maritime trade.  相似文献   
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88.
There is not only one methodology for the study of mineralogical phases in archaeological samples. In this paper, we discuss a strategy applied to ancient iron nail samples completely based on non-destructive analyses. The archaeological samples come from the archaeological site of Valle delle Forme (province of Brescia–Italy) and date back to the 1300–1400 ad. Neutron-based techniques, like time-of-flight neutron diffraction and neutron tomography, have been used to determine the mineralogical composition and the structure of nails. An independent check for the assessment of the presence of different mineralogical phases was given by Raman spectroscopy. The combination of different non-destructive techniques has provided very useful information on their chemical composition, nature of the patina and corrosion features of the nails (also in the bulk of the samples).  相似文献   
89.
In this article, we present the results of the 2011 field season at the Iron Age burial site of Nandá, on the Island of Corisco, located between Equatorial Guinea and Gabon. The excavations followed a survey conducted in 2009, which evinced the extraordinary interest of the site and suggested its funerary nature. The excavations documented three levels of occupation belonging to two different phases, which are known in the region as Oveng (ad 1–600) and Group II (ad 600–1100). The first phase was characterized by secondary burials with rich metallic offerings, which were sealed by a settlement at the end of the period; the second phase witnessed the establishment of a large burial site with primary interments. Similar burials are known from Cameroon and Gabon, but the number of features identified at Nandá and the funerary sequence are quite unique in the region. Here, the evidence will be interpreted in light of Jan Vansina’s theories, where he postulates a common political tradition in Equatorial Africa from which later developments stem.  相似文献   
90.
Focusing on a philatelic oddity that erringly identifies a picture of Santiago Ramón y Cajal as that of Camillo Golgi, this brief article examines official and unofficial stamp issues honoring the two great neuroanatomists, one from Spain and the other from Italy, who were early Nobel Prize winners in Physiology or Medicine.  相似文献   
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