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   83327篇
  免费   2058篇
  国内免费   1512篇
财政金融   5787篇
工业经济   3643篇
计划管理   15119篇
经济学   13973篇
综合类   15189篇
运输经济   1275篇
旅游经济   4218篇
贸易经济   10672篇
农业经济   5767篇
经济概况   11252篇
信息产业经济   2篇
  2024年   271篇
  2023年   828篇
  2022年   1097篇
  2021年   1651篇
  2020年   2093篇
  2019年   1509篇
  2018年   1423篇
  2017年   1748篇
  2016年   1785篇
  2015年   1981篇
  2014年   4860篇
  2013年   6536篇
  2012年   6767篇
  2011年   8421篇
  2010年   6206篇
  2009年   5642篇
  2008年   6432篇
  2007年   5908篇
  2006年   5640篇
  2005年   4063篇
  2004年   2939篇
  2003年   2416篇
  2002年   1574篇
  2001年   1411篇
  2000年   947篇
  1999年   517篇
  1998年   239篇
  1997年   234篇
  1996年   173篇
  1995年   170篇
  1994年   81篇
  1993年   85篇
  1992年   64篇
  1991年   46篇
  1990年   44篇
  1989年   32篇
  1988年   23篇
  1987年   21篇
  1986年   16篇
  1985年   201篇
  1984年   228篇
  1983年   168篇
  1982年   137篇
  1981年   66篇
  1980年   82篇
  1979年   56篇
  1978年   40篇
  1977年   23篇
  1975年   1篇
  1973年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Abstract

Through a case study of conservation voluntourism this article brings together critical political ecology, multispecies ethnography, and studies of humanitarian tourism to advance a political ecology of multispecies conservation voluntourism. The article presents multispecies conservation voluntourism as a field that produces and is produced by an “affect economy”, or an economy based on the exchange or trade in the relational. Since the mid-1990s, life on Utila, Honduras, a popular discount backpacker scuba destination located along the Mesoamerican Barrier Reef, has been deeply transformed by the growth of dive tourism, the ecological destruction it has produced, and now the conservation voluntourism industry emerging in its wake. Seventy percent of Utila is comprised of mangroves and associated wetlands, home to several endangered and endemic species. Using examples of whale shark tourism, lionfish hunts, and iguana tracking, this article shows how conservation organizations operate as affect generators, enabling the privilege of engaging in multispecies encounters. Engaging in multispecies conservation voluntourism produces value in the form of cultural capital which is then exchanged for material outcomes by volunteers in the global economy; at the same time, this form of voluntourism obscures local relationships to nature and alters multispecies assemblages from past configurations.  相似文献   
2.
ABSTRACT

This article recounts three stories from TEFI’s walking workshop in Nepal: the construction of a road through what was once a trekking path; a dance-floor encounter at a Himalayan party; and the arrival of one participant, fatigued by jet lag and disoriented by the new surroundings. These stories of confusion, discomfort and fear are linked by one common theme: the potential of uncertainty to foster deep reflection and nuanced conclusions. The premise that uncertainty is to be valued and even cultivated has been explored in educational theory, spiritual traditions, and research on transformative learning. These sources affirm the role of uncertainty in the process of knowledge creation. However, accepting this role can be challenging for educators because it requires they assume a new identity, one which they may perceive as being at odds with their status as “teacher” the identity of learner. One way for the educator to address this challenge may be through recounting their own stories of uncertainty. Stories of being immersed in unfamiliar situations that challenge, confuse and even frighten – stories, in other words of being a tourist – can foster reflection on an intellectual, emotional and spiritual level, engaging the “whole” person, and thus initiating the educator/learner’s transformative journey.  相似文献   
3.
ABSTRACT

We present a group dynamics model that shows knowledge integration as a process occurring over time. As each individual in the group contact others, his own knowledge changes, and over time the collective knowledge is obtained. This allows modeling knowledge diffusion in a social network and while the models presented in this paper are not competitive in that area, they approach the problem from previously unconsidered direction. We test the behavior of the model in a multi-agent simulation and we test a simple advertisement campaign in a social network. We provide discussion of elements needed for making model more competitive.  相似文献   
4.
This paper addresses a simple question: why do people vote? Though simple, this question remains unanswered despite the considerable attention it has received. In this paper, I show that purely rational–instrumental factors explain a large fraction of turnout variations, provided that the effect of the margin of victory on implemented policy is considered. I extend Myerson's models of elections based on Poisson games, and show that, when platforms are responsive to vote shares, the predictions of the model become consistent with several stylized facts, including the secular fall in turnout rates in the US.  相似文献   
5.
In this article the impact of technology education, as a new learning area (subject) in the curriculum, on in-service teacher education in South Africa is described in order to ascertain the extent of the impact. The research on which this article is based draws on a variety of experiences and observations in the field at grassroots level (in particular an outreach project in rural communities). The envisaged impact of technology education on South African schools, communities, teacher educators and teachers, the range of in-service teacher education that is required, and the impacts in urban and rural areas are discussed. Finally a number of concluding remarks are made about the extent of the impact of the inclusion of technology education in the new National Curriculum Statement and whether the situation has changed since the implementation of a pilot technology education project in 1998. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
6.
This paper compares the approximation capabilities of the minflex-Laurents translog and minflex generalized Leontief cost functions with their translog and generalized Leontief counterparts in Monte Carlo experiments. The minflex Laurent specifications generally provided closer approximations to underlying technical and economic parameters. Imposition of nonlinear restrictions on some of the parameters of the minflex Laurent models yielded measurable improvement in estimated elasticities of substitutions, returns to scale, and rates of technical change.The refereeing process of this paper was handled through E. Appelbaum.  相似文献   
7.
We give an example of a subspace K of     such that     , where     denotes the closure with respect to convergence in probablity. On the other hand, the cone   C ≔ K − L +  is dense in   L   with respect to the weak-star topology  σ( L , L 1)  . This example answers a question raised by I. Evstigneev. The topic is motivated by the relation of the notion of no arbitrage and the existence of martingale measures in Mathematical Finance.  相似文献   
8.
Lead markets, innovation differentials and growth   总被引:1,自引:0,他引:1  
This article suggests that the specialization of countries in international trade is determined by the lead-lag market pattern of national markets. Many internationally successful innovations have been adopted first in one country while other countries initially either preferred other designs or an established product. A model for the international diffusion of innovations is presented in which nationally preferred innovation designs compete to become a globally dominant design. In this model, there are country-specific market attributes that increase the likelihood that the choice a country makes among alternative technologies is followed around the world. It is argued that technological knowledge gaps are not the origin of an international competitive advantage. Instead, a country gains a competitive advantage because a specific innovation design was adopted earlier than in any other country. This gives local firms a head start in producing, gathering marketing intelligence and securing the property rights of a globally successful innovation. In countries with lag market characteristics, domestic innovations are less likely to get adopted worldwide. Lag markets often switch from a domestic innovation design to a foreign innovation design, which increases imports. The lead-lag market explanation of trade specialization has implications for national policies. In this model domestic innovations do not always foster exports; idiosyncratic innovations induced by lag market contexts can hamper the export chances of local firms and in the end lead to an increase in imports. It is suggested that in order to increase exports, national policies have to distinguish between a domestic lead and lag market context in each industry. While in a lead market context, traditional policy instruments that enhance the rate of innovations are effective, in a lag market situation national follower strategies are more appropriate.  相似文献   
9.
The enterprise management informatization construction is complex system engineering. The paper begins with the information management integration idea, and adopts the method of enterprise management system integration. The integration of SCM, ERP and CRM can solve the defects of "information flooding" and "information separate island". Firstly, the paper explains the concept of integration. Secondly, it analyses the three levels of the enterprise management system integration. Thirdly, the composition of the enterprise management system integration is discussed. Finally, it puts forward the integration mode of SCM, ERP and CRM under the E-commerce environment.  相似文献   
10.
通过对公共服务的属性分析,结合新政治经济学理论和政府失败的现实因素,探索公益物品的有效供给模式,提出了公共服务的签约转包机制,并分析了这一机制的不足和政府的作用。  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