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That potential pathogens transit to and through body parts and fluids of densely connected individuals belonging to highly mobile ethnic groups shows how relevant to health is the study of sexual networking. Five recent books show sexual networking has quickened owing to labor migration, poverty, religious double standards, militarism, tourism, and nation building. Gender conventions and sexual practice in Brazil, Thailand, Indonesia, and Papua New Guinea have hardened in some contexts and destabilized in others. HIV, HPV, AIDS, and cervical cancer are expressed in gendered and sexed bodies, behaviors, technologies, and ideas that are often situated in violent interpersonal and structural contexts.  相似文献   
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宫廷收藏对宫廷绘画的影响:宋徽宗的个案研究   总被引:1,自引:0,他引:1  
本文通过对《宣和画谱》进行细致的梳理以探求宋徽宗的收藏标准和审美趣味,排列出宋徽宗对不同时期、不同背景的画家的喜好以及对不同类型绘画作品的品评。指出宋徽宗利用丰富的宫廷收藏多方位地擢用、培养本朝宫廷画家,从而对宫廷绘画产生了深刻的影响。  相似文献   
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This article evaluates recent literatures within International Relations on so‐called ‘private force’. It suggests that the conceptual weaknesses of much of this literature can be accounted for, in part, by a misunderstanding of the historical and sociological importance of the way power is organized and legitimated through shifts in the public—private distinction. This distinction is one of the primary mechanisms, if not the primary mechanism, for organizing political, economic and, therefore, military power. For the sake of historical accuracy and conceptual integrity scholars should abandon the terminology of ‘public’ and ‘private’ force. Tracing how public‐private distinctions shift and change as an effect of political power is a joint task for historical sociology and international political theory  相似文献   
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This paper describes the design features and capabilities of a portable automated in‐situ closed chamber (ISCC) for the quantification of CO2 fluxes in dryland soils where both photosynthetic and respiratory components may be associated with a cyanobacterial crust. The processes of CO2 flux in dryland soils are briefly described in order to clarify the conditions that make quantification of these fluxes problematic. The instrumentation currently available for in‐situ soil CO2 flux measurements is then reviewed demonstrating their inadequacies for the dryland environment. The ISCC described here is a member of the closed or enrichment class of soil respiration chambers. The ISCC, however, features an optical window possessing high (>90%) transmission in the photosynthetic active region (PAR) of the solar irradiance spectrum, permitting observations of photosynthesis. The ISCC possesses automatic venting and purging so that gaseous concentrations inside the chamber do not change from ambient sufficiently to significantly affect diffusion. The ISCC features both active and passive cooling employing internal solid‐state Peltier coolers and external aluminised Mylar respectively. This avoids severe disturbance of the microclimate within the chamber due to admission of high fluxes of PAR and permits in‐situ operation under a wide range of ambient field temperatures (~ ?5 to 40°C). Sensors internal to the chamber monitor temperature, relative humidity, irradiance and pressure. In this implementation the ISCC is coupled to a portable gas chromatograph (Agilent GC‐3000) to sample the chamber atmosphere. Indicative data for Kalahari Sand soils of Botswana are presented as an illustration of the general performance characteristics.  相似文献   
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Although the megalithic phenomenon in southern Iberia has received attention since the mid‐nineteenth century, there has been very little attention paid to the role that megalithic structures played in the organization of prehistoric landscapes. Just as in other areas of Europe, however, southern Iberian megalithic structures must have played complex roles in the social organization of landscapes that go far beyond their use as funerary containers. Using examples from our work in southern Iberia, we employ GIS‐based spatial analysis to explore for the first time various aspects of the landscape dimension of these monuments. We discuss three case‐studies for which fresh field data have been recently made available. In the first (Almadén de la Plata) we find patterns of association between medieval transhumance routes and megaliths, and we use cost‐surface modelling to suggest that medieval routes may reflect earlier, prehistoric patterns of movement which in turn suggest that megalithic structures functioned in this area as waypoints within an emerging mobility system for people and livestock. In the second case (Aroche) we show correlations between the locations of megaliths and theoretical territories defined by isochrones and contrast this pattern with the distribution of non‐megalithic funerary sites of the Early Bronze Age, concluding that the spatial distribution of megaliths in this region may relate to their role as landmarks. Lastly we describe a far more specific relationship which we have encountered in the Antequera region, where we believe we have identified a relationship between the orientation of the megalithic structure of Menga, a prominent natural feature and several newly discovered prehistoric sites. Together, these three examples suggest that the current focus on typology, chronology and contents in the study of Iberian megaliths needs to be matched with efforts to identify and interpret the often highly complex structure of the prehistoric landscapes of which they form an integral part.  相似文献   
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All around the world, places of trade are typically conceived as places of deceit, if not outright danger: the plight of the carpet seller in Istanbul might be likened to that of the used car salesman in the West, for instance. But Istanbul’s Grand Bazaar is a particularly well-known centre of (perceived) deceit – the home of the trickster par excellence – and carpet sellers are the iconic bearers of this reputation. As a threshold of thresholds, the bazaar is a global crossroads, where a huge diversity of cultures and histories intersect, and carpets are objects that express this perhaps the most magnificently.  相似文献   
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