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   337篇
  免费   17篇
  2023年   2篇
  2022年   3篇
  2020年   5篇
  2019年   12篇
  2018年   7篇
  2017年   8篇
  2016年   16篇
  2015年   11篇
  2014年   13篇
  2013年   107篇
  2012年   18篇
  2011年   10篇
  2010年   11篇
  2009年   10篇
  2008年   4篇
  2007年   4篇
  2006年   9篇
  2005年   2篇
  2004年   7篇
  2003年   8篇
  2002年   3篇
  2000年   4篇
  1999年   3篇
  1998年   4篇
  1997年   4篇
  1996年   4篇
  1995年   2篇
  1992年   3篇
  1990年   4篇
  1989年   3篇
  1988年   2篇
  1987年   5篇
  1986年   3篇
  1985年   2篇
  1984年   4篇
  1982年   3篇
  1980年   2篇
  1979年   2篇
  1978年   4篇
  1977年   2篇
  1976年   3篇
  1975年   3篇
  1969年   2篇
  1964年   1篇
  1958年   2篇
  1957年   1篇
  1956年   1篇
  1955年   2篇
  1954年   1篇
  1951年   1篇
排序方式: 共有354条查询结果,搜索用时 15 毫秒
261.
This article investigates the role of power and ideology in the endogenous formation of policy networks. According to the Advocacy Coalition Framework (ACF), shared ideology (conceptualized as a system of policy‐relevant beliefs and values) is the primary driver of collaboration within policy subsystems. On the other hand, Resource Dependency Theory suggests that power‐seeking is an important rationale behind network structure, and that collaborative ties are formed primarily on the basis of perceived influence. Hypotheses are tested using a new method of egocentric network correlation, based on survey data of policy networks in five regional planning subsystems in California (N = 506). Results suggest that ideology is an important force behind network cohesion: Not only do policy elites systematically avoid networking with ideologically dissimilar actors but collaborative ties are also systematically formed among actors with shared beliefs. Power‐seeking does not operate on a network‐wide scale but may drive network formation among coalitions of ideologically similar agents.  相似文献   
262.
For both Aristotle and Hegel, the family is the foundation in which the universalized rule of law is validated according to the political structure of the 'Polis' or 'State' itself. This composite whole or structure of society (Ancient Polis/Modern State) is the political end of humanity for both philosophers, which in turn finds its primordial beginning in the family. For Aristotle, it is in the kingly rule of the household that the property-based distinction of citizenship is set for the rule of his ideal Polis. For Hegel, it is in the love affirmed through caring affection within the nuclear family that the dialectical framework for the freedom of civil society, and the rational unity of a congregational 'spirit' in the State, finds its foundation. For both thinkers, the family sets the base for a political theory that defines citizenship in a manner that transcends the particularities of kin bonds.  相似文献   
263.
In the late 1870s and 1880s, prior to the development of movie cameras or projectors, English-American photographer Eadweard Muybridge (1830–1904) photographed sequential images of people and animals in motion, using arrays of sequentially triggered single-image cameras. In 1885, Philadelphia neurologist Francis Dercum (1856–1931) collaborated with Muybridge at the University of Pennsylvania to photograph sequential images of patients with various neurological disorders involving abnormal movements, and particularly various gait disorders, including both the sensory ataxic gait of tabes dorsalis and various spastic gaits. Dercum used tracings of sequential photographic images to plot trajectories of limbs as a way to characterize and distinguish pathologic gaits. The Dercum-Muybridge collaboration produced the first motion-picture sequences of neurological gait disorders ever filmed. These sequences and the trajectory-based studies that derived from them were a milestone in studies of pathologic gaits.  相似文献   
264.
An archaeological survey of the Viking Age settlement pattern in the Langholt region of North Iceland suggests that being early in this sequence conferred tremendous advantages to the settlers of this previously uninhabited landscape. Many of the farms established during the settlement of Iceland (which began about a.d. 870) are in use today. However, accessing the Viking Age landscape is difficult. In Langholt the earliest layers of most farmsteads are buried under a thousand years of occupational debris, while the abandoned sites have been covered by extensive soil deposition. Here we report on our coring and test excavation results that outline Viking Age farmstead location, establishment date, and maximum size by the end of the Viking Age. There is a strong correlation between farmstead size and establishment date. This correlation suggests that during the rapid settlement of Iceland, the farmsteads established by earlier settlers were wealthier and that wealth endured.  相似文献   
265.
266.
267.
Southern Baffin Island has been occupied for several millennia, but its enormous size, coupled with scarcity of identified inland archaeological sites that can be confidently linked to coastal occupations, makes modeling ancient seasonal mobility across the region through traditional cost-surface least-cost pathway approaches impractical. We present a method that combines weighted multi-criteria cost surface analysis with a watershed function to create a “mobility-shed” of non-winter travel pathways covering the study area. We evaluate the predictive utility of the resulting pathways for future archaeological survey by assessing their spatial relationships to known archaeological sites. The results of this comparison suggest that elevation and land cover criteria should be augmented with ethnographic and resource availability data to model mobility in this region.  相似文献   
268.
Indigenous community‐based monitoring has been a central feature in many international attempts to improve monitoring of and local adaptation to environmental change. Despite offering much promise, Indigenous community‐based monitoring has been underutilised in natural resource management in Australia, particularly within the remote, semi‐arid rangelands. This paper discusses contextual social and environmental factors that may help to explain this apparent deficiency, before critically analysing key stakeholder perceptions of the roles for, and challenges of monitoring in the Alinytjara Wilur ara Natural Resources Management region in the north‐west of South Australia. The analysis guides a discussion of responses to better integrate monitoring in general, and Indigenous community‐based monitoring in particular, into regional environmental management approaches. We argue that community‐based monitoring offers a range of benefits, including: better coordination between stakeholders; a heightened ability to detect and respond to climatic trends and impacts; the effective utilisation of Indigenous knowledge; employment opportunities for managing and monitoring natural resources; and improved learning and understanding of rangeland socio‐ecological systems. Identified opportunities for spatial and temporal community monitoring designed for the Alinytjara Wilur ara region could be of value to other remote rangeland and Indigenous institutions charged with the difficult task of monitoring, learning from, and responding to environmental change.  相似文献   
269.
Whereas Ivan P. Pavlov (1849-1936) is well-known for his work on classical conditioning, his contribution to neuroscience, particularly his interest in the function of neural centers in the central nervous system, is not as widely known. During the last three decades of his life, Pavlov explored cortical processes by salivary reflex conditioning, a method he used to develop his theory of higher nervous activity. This theory outlined the function of the brain in higher organisms in their interaction with the changing environmental contingencies. As early as 1908, Pavlov outlined a neurophysiological theory as the physiological basis of his theory of higher nervous activity. He maintained that the neural processes of excitation and inhibition irradiate and concentrate among the cortical neural centers. Most of all, he emphasized the plasticity of the cortex in higher organisms’ in the Darwinian struggle for existence.  相似文献   
270.
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