全文获取类型
收费全文 | 1596篇 |
免费 | 121篇 |
专业分类
1717篇 |
出版年
2021年 | 20篇 |
2020年 | 25篇 |
2019年 | 125篇 |
2018年 | 68篇 |
2017年 | 73篇 |
2016年 | 129篇 |
2015年 | 98篇 |
2014年 | 92篇 |
2013年 | 264篇 |
2012年 | 92篇 |
2011年 | 103篇 |
2010年 | 82篇 |
2009年 | 57篇 |
2008年 | 77篇 |
2007年 | 79篇 |
2006年 | 48篇 |
2005年 | 21篇 |
2004年 | 41篇 |
2003年 | 34篇 |
2002年 | 20篇 |
2001年 | 22篇 |
2000年 | 29篇 |
1999年 | 3篇 |
1998年 | 14篇 |
1997年 | 17篇 |
1996年 | 12篇 |
1995年 | 14篇 |
1994年 | 11篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 6篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1951年 | 1篇 |
排序方式: 共有1717条查询结果,搜索用时 0 毫秒
1.
Heather A. Larsen‐Price 《政策研究杂志》2012,40(1):147-168
This article investigates how presidential policy attention is allocated across policy tools and whether there is a channeling of tool use by policy area. I also examine whether there is evidence of disproportionate information processing within presidential policy attention allocation and whether it is common across presidential policy tools. Presidential messages, hearings on administrations' legislative proposals, amicus briefs, and executive orders are employed to capture presidential policy tools. The allocation of attention via these four instruments is examined from 1957–2007 in the policy areas of defense and foreign affairs, macroeconomics, banking and commerce, civil rights, law and crime, and labor and immigration. I find that there is a canalization of presidential policy attention by instrument, and that the opportunity structure of policy tools shapes attention allocation. Additionally, I find evidence for punctuated equilibrium theory in the allocation of presidential policy attention via these four tools. When presidents do shift their attention to an issue area, they often attack the issue with some coordination of their policy instruments. 相似文献
2.
Kelley A. Hays‐Gilpin 《Reviews in Anthropology》2013,42(3):233-251
Leppert, Richard. Art and the Committed Eye: The Cultural Functions of Imagery. Boulder CO: Westview Press, 1996. xvii + 348 pp. including notes, references, and index. $63.00 cloth, $24.00 paper. Carr, Christopher and Jill E. Neitzel, eds. Style, Society, and Person: Archaeological and Ethnological Perspectives. New York: Plenum Press, 1995. xx + 477 pp. including index. $69.50 cloth. 相似文献
3.
This paper explains, with the example of a Roman object (the ‘Mars from Oberweningen’, Switzerland), why neutrons can be used preferentially for the non‐destructive analysis of metallic objects of relatively large size. This method is superior to the conventional X‐ray tomography method due to the higher penetration ability in metals such as copper, tin and even lead. With this method, differing materials can also easily be differentiated. In this way, the inner and outer structures of objects can be observed with the help of tools based on mathematical algorithms. Slices at arbitrary positions and segmentation of different material clusters aid the understanding of manufacturing processes and can describe the present preservation status. This helps in selecting optimal and additional conservation measures in museums for further preservation. Beside the qualitative overview on structure and inner properties of the objects, quantitative information can be derived about material content and composition. This method and the subsequently needed facilities for this method are available at PSI for similar studies on demand. 相似文献
4.
5.
A. CRISTINA DE LA VEGA‐LEINERT SUSANNE STOLL‐KLEEMANN TIM O'RIORDAN 《Geographical Research》2009,47(4):351-361
This paper makes the case for advancing sustainability science partnerships (SSPs) both within universities and through innovative means of integrating universities with external public‐private and civil sectors. It links the basic principles of sustainable development with an emerging science of cooperative learning that connects researchers to a wide range of partners. SSPs are specifically designed to be transformational through becoming active agents for societal change. Universities play a special role here because they can act both as communication networks and as laboratories for developing the capability to design and manage SSPs in the creative transition to sustainability. It is gratifying to note that these ideas are beginning to emerge in a number of universities, with European examples being highlighted in this paper. Further steps towards introducing full‐blooded SSPs across the university spectrum are suggested. 相似文献
6.
A lack of clear political commitment together with confusing rules and enforcement often characterize the institutional context of policy implementation and regulatory compliance in developing countries. By connecting such contextual features to existing models of policy implementation and regulatory compliance, we examine how regulatory factors are related to basic and proactive corporate environmental management practices in the Pearl River Delta region in China. Drawing on data derived from both a survey and in‐depth interviews, we show that a perception of clear political commitment to environmental protection across multiple government levels and units is positively associated with business efforts in basic environmental practices, regardless of the specific enforcement intensity. Nevertheless, a perception of clear political commitment is not related to proactive environmental practices. Conversely, a perception of policy ambiguity, in the form of confusing regulatory standards and enforcement, is negatively associated with corporate efforts in both basic and proactive environmental practices; yet, intensive inspections mitigate these negative associations with policy ambiguity. 相似文献
7.
Strategic planning, as developed in the military and business sectors, offers a procedural model with important differences from the earlier comprehensive approach. Economic and physical development strategies, often called for by national planning legislation in European countries, frequently have little in common with the model proposed by Steiner for private firms, or espoused for the public sector by Bryson and others: there appears to be confusion resulting from use of similar terms. This paper investigates efforts to employ at least the major features of strategic planning in two institutionally and culturally different contexts, nearly half a world apart. In Bergen, Norway, these principles have informed economic development planning and planning for a major district of the city. In the case of Seattle, Washington, USA, the new comprehensive plan is based on framework policies developed during a 2‐year public process, and now that the city‐wide plan is adopted, Seattle is turning to developing neighbourhood plans which will provide more operational detail for guiding public and private investments. Comparison of these two cases both provides contrasts and similarities stemming from the two different contexts, and help to evaluate the transférability of strategic planning from the private to the public sector. 相似文献
8.
This paper explores attempts to establish a network of firms and organizations to develop the multimedia industry at a regional level. The paper sets out its review in the context of the regional economy, and then details the nature of the networking process under investigation. An evaluation of networking in this context is provided, based on detailed empirical research. Lessons are drawn from the experiences of seeking economic modernization through organizational networks. 相似文献
9.
10.