首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   520篇
  免费   68篇
  2024年   6篇
  2023年   48篇
  2021年   5篇
  2020年   31篇
  2019年   48篇
  2018年   44篇
  2017年   38篇
  2016年   33篇
  2015年   28篇
  2014年   43篇
  2013年   112篇
  2012年   35篇
  2011年   19篇
  2010年   18篇
  2009年   14篇
  2008年   13篇
  2007年   9篇
  2006年   6篇
  2005年   6篇
  2004年   2篇
  2003年   1篇
  2002年   8篇
  2001年   2篇
  2000年   1篇
  1999年   7篇
  1998年   4篇
  1997年   6篇
  1995年   1篇
排序方式: 共有588条查询结果,搜索用时 15 毫秒
121.
Drawing together insights from neo‐Innisian geography and environmental history, this paper explores the landscape and environmental changes engendered by ‘cyclonic’ patterns of development associated with uranium production at Uranium City, Saskatchewan. Strong postwar demand for uranium led to the establishment and rapid expansion of Uranium City on the north shore of Lake Athabasca as a ‘yellowcake town’, dedicated to producing uranium oxide concentrate to supply federal government contracts with the US military. In spite of optimistic assessments for the region's industrial future, the new settlement remained inherently unstable, tied to shifting institutional arrangements and external markets, and haunted by the spectre of resource depletion. The planning and development of the townsite at Uranium City reflected both neocolonial desires to open the north to Euro‐Canadian settlement and efforts by the state to buffer the stormy effects of resource dependency. Ultimately, however, quixotic government efforts to implant an outpost of industrial modernity in the Athabasca Region failed to forestall the inevitable winds of change, which left in their wake destructive legacies of social dislocation and environmental degradation, already evident with the near‐collapse of the uranium export market by the early 1960s.  相似文献   
122.
This essay sheds new light on the meaning and measurement of compactness—one of the most intriguing and least‐understood properties of geographic shapes. We articulate a unified theoretical foundation for the study of shape compactness that rests on two simple observations: First, that the circle is the most compact of shapes. And second, that there are 10—and possibly more—distinct geometrical properties of the circle that make it the most compact of shapes. We introduce these 10 properties, illustrate them with real‐world examples and define indices associated with these properties that can be calculated using a geographic information system.  相似文献   
123.
This article uses thirteenth-century hospital sermons as a window into the moral and religious environment of these charitable institutions, large numbers of which were founded during the twelfth and thirteenth centuries. What emerges from the reportationes of sermons preached in the hôtel-dieu of Paris and ad status sermons directed at hospitals' personnel and inmates by Jacques de Vitry, Humbert of Romans and Guibert de Tournai is a spirituality that stressed the penitential (and potentially salvific) power of doing works of mercy (in the case of hospital workers) and bodily suffering (in the case of hospital inmates). The particular social context of hospital preaching is also evident in preachers' anxieties about the quality of hospital administration. The sermons that were preached in thirteenth-century hospitals reflect the heightened value placed on caring for the sick and poor, a historical development more often associated with the later middle ages.  相似文献   
124.
Bulk samples of mortars from the Santa Eulalia de Bóveda temple (NW Spain) have been characterized from a chemical and mineralogical point of view, with the aims of contributing technological and provenance inferences, and evaluating possible correlations with the various identified stages along historical periods of construction.  相似文献   
125.
The market constitutes the crucial point in the debate which prevailed since the xviiith century in the history of antique economy. Became particularly complex for the Greek world because many historians and anthropologists (like Karl Polanyi) place there the liberty of the market economy as a break with the previous period. History must abandon too dogmatic a position on this emergence of the market and consider first the levels of the constitution of a market place, the agora, beginning with the end of the archaic period. The Greek city intervenes in the way in the exchanges. In this article, we study these interventions on the conditions of the sale and purchase, the practices, the values and the prices, the supplies, so as to understand the real innovation which that represents.  相似文献   
126.
Indigenous families are overrepresented among those within Canada who experience food insecurity. Studies have largely focused on northern populations, with less attention paid to southern and urban communities, including the social, cultural, and geographic processes that challenge food security. In this study, we present findings from a decade‐long community‐based study with the Southwest Ontario Aboriginal Health Access Centre (London, Ontario) to examine family perspectives related to the social determinants of food security. These topics were explored through qualitative interviews (n = 25) and focus groups (n = 2) with First Nation mothers with young children from the city of London, and a nearby reserve community. Interviewees from both geographies identified a number of socio‐economic challenges including household income and transportation. However, some interviewees also shed light on barriers to healthy eating unique to these Indigenous contexts including access issues such as a lack of grocery stores on‐reserve; loss of knowledge related to the utilization of traditional foods; and the erosion of community, familial, and social supports. Resolving these unique determinants of food security for urban and reserve‐based First Nation families will require a range of economic and culturally specific interventions, particularly those that support development and uptake of Indigenous foodways.  相似文献   
127.
How do policymakers respond to crises? The Narrative Policy Framework (NPF) answers this question by focusing on the contest over policy narratives. This paper focuses on the individuals constructing those policy narratives, conceptualizing them as policy narrators. Using a case study approach, we analyze seven counties located in a major oil and gas formation in Texas, which in early 2020 faced both an oil bust and the onset of COVID-19. We explore four sets of propositions about how policy narrators source, synthesize, and share their policy narratives. We find that while their narratives vary, the structure of those narratives is similar; their backgrounds shape how they source narratives, and they tailor their levels of narrative breach to the action (or inaction) they hope for. They avoid casting other local actors as villains, place their audience as the hero, and situate themselves as either supporting or a member of that audience, stressing their common ties. From these findings, we put forward a working definition of policy narrators, identify how they fit into the NPF, and discuss how they relate to other types of policy actors, including policy entrepreneurs.  相似文献   
128.
Human trafficking is a compelling and persistent problem that has attracted a great amount of attention among political leaders, government institutions, NGOs, and nonprofit organizations. While there is consensus that trafficking necessitates a multipronged policy response commonly known as the “3Ps” (prosecution, protection, and prevention), anti-trafficking policies diffused across U.S. states in a piecemeal fashion. In this paper, we explore the fragmented diffusion of the different types of anti-trafficking laws. Drawing from social constructivist approaches, we posit that the differential diffusion rates depend on the social construction of the target population and policy intention of the law. Using event history analysis, we examine the diffusion of 14 types of human trafficking laws throughout the U.S. during 2003–2013. We find strong support for our hypotheses and show substantial differences in the rates at which prosecution, protection, and prevention-related laws diffuse.  相似文献   
129.
This paper expands the Narrative Policy Framework (NPF) by employing an exploratory case study approach to examine the construction of narratives temporally. A large-N Twitter dataset concerning the Bears Ears and Grand Staircase-Escalante monuments controversy is utilized to examine the question: how does the use of narrative strategies change over time? Through the application of change-point analysis, we determine time points of significant shifts towards use of the devil-angel shift, scope of the conflict, and causal mechanism strategies. Overall, we find that organizations do not vary their use of narrative strategies over the course of a policy conflict but instead demonstrate discrete changes in response to certain policy events. Based on our findings, we conclude with suggestions for refining and expanding NPF hypotheses. Specifically, we recommend a more contextual analysis of shifts in narrative strategy use in response to specific events over time.  相似文献   
130.
Policy scholars have increasingly focused on collaborative and competitive relationships between stakeholder coalitions. The Advocacy Coalition Framework (ACF) in particular has directed scholarly attention toward such relationships. The ACF defines advocacy coalitions as groups of actors who share beliefs and coordinate their action. However, previous research has been inconsistent in defining and measuring coalitions, which has hampered comparative research and theory building. We present a method called the Advocacy Coalition Index, which measures belief similarity and the coordination of action in a manner that makes it possible to assess the extent to which advocacy coalitions are found in policy subsystems, whether subgroups resemble coalitions, and how individual actors contribute to coalition formation. The index provides a standardized method for identifying coalitions that can be applied to comparative research. To illustrate the effectiveness of the index, we analyze two climate change policy subsystems, namely Finland and Sweden, which have been shown to differ in terms of the association of belief similarity with coordination. We demonstrate that the index performs well in identifying the different types of subsystems, coalitions, and actors that contribute the most to coalition formation, as well as those involved in cross-coalition brokerage.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号