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This paper examines the reliability of Structure from Motion (SfM) photogrammetry as a tool in the capture of forensic footwear marks. This is applicable to photogrammetry freeware DigTrace but is equally relevant to other SfM solutions. SfM simply requires a digital camera, a scale bar, and a selection of oblique photographs of the trace in question taken at the scene. The output is a digital three-dimensional point cloud of the surface and any plastic trace thereon. The first section of this paper examines the reliability of photogrammetry to capture the same data when repeatedly used on one impression, while the second part assesses the impact of varying cameras. Using cloud to cloud comparisons that measure the distance between two-point clouds, we assess the variability between models. The results highlight how little variability is evident and therefore speak to the accuracy and consistency of such techniques in the capture of three-dimensional traces. Using this method, 3D footwear impressions can, in many substrates, be collected with a repeatability of 97% with any variation between models less than ~0.5 mm.  相似文献   
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Environmental markets have several institutional features that provide a new context for the use of auctions and that have not been studied previously. This paper reports on laboratory experiments testing three auction forms—uniform and discriminatory price sealed‐bid auctions and an ascending clock auction. We test the ability of subjects to tacitly or explicitly collude in order to maximize profits. Our main result is that the discriminatory and uniform price auctions produce greater revenues than the clock auction, both with and without explicit communication. The clock appears to facilitate successful collusion, both because of its sequential structure and because it allows bidders to focus on one dimension of cooperation (quantity) rather than two (price and quantity).© 2009 by the Association for Public Policy Analysis and Management.  相似文献   
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This article examines the accuracy of the Gallup poll in a situation involving multiple political parties of different sizes Using data collected by the Danish Gallup Institute 1957–1980. the article demonstrates that polling results, except those of small parties, are well within the sampling error. An explorative analysis of the data, showing that there is a normal distribution of the differences between election results and polling values, provides the possibility of a simple method of interpreting Gallup poll data at a desirable level of confidence.  相似文献   
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A limited number of recent empirical studies suggest that inmates suffer from high rates of serious mental illness. Different explanations are offered depending on the type of institution: jail or prison. The literature is based largely on urban samples and does not offer comparisons of rates across types of institution within a single study. The present study examined a random sample of 213 jail and prison inmates in a rural state using the Diagnostic Interview Schedule (III-R). Among jail inmates there was little evidence of high rates of serious mental illness, suggesting the criminalization of mental illness may not be as evident in rural settings as urban areas. Among prison inmates, however, high rates of mental disorders were found, supporting previous findings in urban and rural jurisdictions. Implications of the findings are discussed in the context of a consolidated correctional system.  相似文献   
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Although demographic diversity has been of paramount concern to researchers and practitioners in public management, studies exploring managerial strategies to capitalize on and respond to the needs of diverse client populations are scarce. This article examines strategies for managing diversity as a way to buffer environmental challenges in service delivery and performance resulting from heterogeneous client demands. Findings suggest that administrators prioritize diversity efforts when faced with higher levels of regulatory violations (a performance measure). A higher percentage of black residents is associated with lower service quality. However, the effect of managerial strategies for diversity on performance is conditioned by the racial composition of the clients: as the percentage of black nursing home residents increases, diversity management efforts are associated with a lower number of regulatory violations. Similarly, at higher levels of racial heterogeneity, diversity management efforts are associated with fewer regulatory violations.  相似文献   
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ABSTRACT

This article attempts to bridge the gap between social and religious explanations for Islamist radicalisation in the West by understanding the role of religion through the under-utilised perspective of sociology of religious emotions and Wiktorowicz’s concept of cognitive openness. The article draws on interviews with 23 different actors with first-hand knowledge of Islamist radicalisation, and analyses five in-depth interviews with former so-called radicals, four of whom were converts to Islam. The analysis thus has a special focus on the narratives and experiences of converts to radical Islamist worldviews. The radicalisation process of the formers was characterised by an interplay between context specific experiences and individual religiosity. There are social causes for seeking religion as it can provide an emotional meaningfulness in a state of cognitive openness connected to personal family social background, which can stretch over a long period. However, the interviews also show that religiosity affects the social: the religious emotions within radical Islamist groups create a tight-knit community of self-perceived righteous believers, tied to an emotional experience of empowerment that amplifies their radicalisation. The article concludes that the primary role of religion is to structure and direct the emotions from which so-called radical Islamists think and act within religious frameworks.  相似文献   
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