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   10332篇
  免费   69篇
各国政治   388篇
工人农民   1134篇
世界政治   301篇
外交国际关系   373篇
法律   6014篇
中国政治   14篇
政治理论   2150篇
综合类   27篇
  2022年   15篇
  2021年   14篇
  2020年   41篇
  2019年   46篇
  2018年   1335篇
  2017年   1281篇
  2016年   1079篇
  2015年   104篇
  2014年   61篇
  2013年   264篇
  2012年   237篇
  2011年   974篇
  2010年   1049篇
  2009年   630篇
  2008年   790篇
  2007年   752篇
  2006年   59篇
  2005年   121篇
  2004年   229篇
  2003年   212篇
  2002年   77篇
  2001年   72篇
  2000年   56篇
  1999年   59篇
  1998年   29篇
  1997年   30篇
  1996年   44篇
  1995年   46篇
  1994年   40篇
  1993年   19篇
  1992年   31篇
  1991年   34篇
  1990年   38篇
  1989年   40篇
  1988年   37篇
  1987年   28篇
  1986年   38篇
  1985年   30篇
  1984年   35篇
  1983年   25篇
  1982年   18篇
  1981年   23篇
  1980年   14篇
  1979年   27篇
  1978年   28篇
  1977年   27篇
  1971年   19篇
  1970年   17篇
  1968年   17篇
  1967年   12篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
991.
Michelin II: A Per Se Rule Against Rebates by Dominant Companies?   总被引:1,自引:0,他引:1  
In its Michelin II judgment of September 2003, the CFI foundthat Michelin breached Article 82 EC by setting up a systemof rebates that could potentially induce loyalty and excludeits competitors. This paper comments extensively on MichelinII and other cases, with a focus on what sort of competitionpolicy is desirable as regards rebates by dominant companies.Contrary to Michelin II, pricing policies of dominant companieswhich are not linear and not strictly reflecting economies ofscale are not necessarily anticompetitive and may indeed havesignificant pro-competitive effects. Furthermore, a requirementthat a rebate scheme be "economically justified" is very difficultto apply in practice, and the Court should not have put theburden of proof for the justification of quantitative rebatesupon the dominant company. Most preoccupying is the Court'srejection of the effect criterion when deciding on the legalityof a rebate: Such an approach, which differs markedly from USand UK law as well as from the OECD report on fidelity discounts,will generally result in a disproportionate per se-prohibitionof any pricing behaviour and in economic inefficiencies. A fairerand clearer approach could therefore distinguish between rebatesthat are per se allowed and other rebates that ought to be prohibitedonly if they have effects on the market.  相似文献   
992.
993.
994.
In recent years, development agencies (DAs) have focused their activities on consulting projects rather than on financing turnkey projects when assisting emerging markets. The main reason is that the implementation of consulting projects is likely to be connected with an intensive knowledge transfer from developed to emerging markets. Training of local employees and cooperation with local firms are necessary elements to make the transfer effective. The empirical statistics shows training and cooperation to be more frequent in consulting projects financed by DAs as compared to commercial projects. According to theory and experience, training should be included in projects in the least developed host countries, whereas local cooperation should be more frequent, the higher is the development level of the host country. However, DAs do not follow these rules of thumb in a convincing way. A policy implication of the paper is therefore that DAs should better organize and plan the contents of their consulting projects.
Roger SvenssonEmail:
  相似文献   
995.
Several recent studies show European university scientists contributing far more frequently to company-owned patented inventions than they do to patents owned by universities or by the academic scientists themselves. Recognising the significance of this channel for direct commercialisation of European academic research makes it important to understand its response to current Bayh-Dole inspired reforms of university patenting rights. This paper studies the contribution from university scientists to inventions patented by dedicated biotech firms (DBFs) specialised in drug discovery in Denmark and Sweden, which in this respect share a number of structural and historic characteristics. It examines effects of the Danish Law on University Patenting (LUP) effective January 2000, which transferred to the employer university rights to patents on inventions made by Danish university scientists alone or as participants in collaborative research with industry. Sweden so far has left property rights with academic scientists, as they also were in Denmark prior to the reform. Consequently, comparison of Danish and Swedish research collaboration before and after LUP offers a quasi-controlled experiment, bringing out effects on joint research of university IPR reform. In original data on all 3,640 inventor contributions behind the 1,087 patents filed by Danish and Swedish DBFs 1990–2004, Difference-in-Difference regressions uncover notable LUP-induced effects in the form of significant reductions in contributions from Danish domestic academic inventors, combined with a simultaneous substitutive increase of non-Danish academic inventors. A moderate increase in academic inventions channelled into university owned-patents does appear after LUP. But the larger part of the inventive potential of academia, previously mobilised into company-owned patents, seems to have been rendered inactive as a result of the reform. As a likely explanation of these effects the paper suggests that exploratory research, the typical target of joint university-DBF projects in drug discovery, fits poorly into LUP’s requirement for ex ante allocation of IPR. The Pre-LUP convention of IPR allocated to the industrial partner in return for research funding and publication rights to the academic partner may have offered more effective contracting for this type of research. There are indications that LUP, outside the exploratory agenda of drug discovery, offers a more productive framework for inventions requiring less complicated and uncertain post-discovery R&D.
Finn ValentinEmail:
  相似文献   
996.
Life sciences are the best developed area of academic research throughout Latin America. Biomedical research has been particularly successful. However, generally speaking, excellence in research has not been accompanied by commercially successful innovations, a pattern that differs from what has happened in many highly industrialized countries, even small ones. The paper explores some causes of such disappointing outcome, stressing in particular the historical lack of political and social legitimacy exhibited by innovation policies in underdevelopment. From a developmental point of view it is of great importance the building of such legitimacy. One way of doing so is to link more tightly innovation policies to social concerns; bio-innovation is suggested as a productive path towards that aim.
Judith SutzEmail:
  相似文献   
997.
Substantial research has focused on the negative associations between coparenting conflict, parental psychological functioning, and parenting behavior in European American, middle-income, families. However, less attention has been given to ethnic minority families and to families that are nontraditionally structured. In an effort to address this gap, the current longitudinal study examines the relation between conflict with the mother-identified primary co-caregiver and parenting practices in single parent, economically disadvantaged African American families. Participants included 234 mother–child dyads. It was hypothesized that conflict would relate to less utilization of positive parenting practices and that this association would be mediated, at least in part, by maternal psychological distress. Hypotheses were examined using structural equation modeling (Lisrel 8.3): Conflict with a co-caregiver was significantly related to parenting both directly and indirectly through maternal psychological distress. Implications of the findings are discussed.
Shannon DorseyEmail:
  相似文献   
998.
Terrorism and relative justice   总被引:1,自引:0,他引:1  
Terrorist violence and violent justice responses have much in common. While contextually dependant, both forms of violence lay claim to contestred legitimacies. The relationships between terrorism and justice responses require both theoretical and empirical examination if the prospects for controlling the violence they perpetrate is to be sharpened.
Mark FindlayEmail:
  相似文献   
999.
Given growing concerns about the loss of farmland in the US, governmental and nonprofit groups are seeking innovative, cost-effective methods to preserve lands that will elicit additional landowner participation. This article describes four innovative farmland preservation techniques and derives implications for the policy process through interviews of key stakeholders: program administrators, lawmakers, and landowners. Experts on farmland preservation were also interviewed to ensure stakeholder perceptions substantively inform the policy process. Four techniques were selected for assessment from approximately 30 novel techniques. Reactions to these policy options reflect stakeholder perceptions of a baseline condition; the perceptions help evaluate which options are likely to survive the policy process and what attributes will lead to their acceptability because few of these techniques have yet become policy. Although the stakeholders may have more limited experience with the policy process, land preservation experts validated many of the results and the possibility of success in the “rough and tumble” of the policy process. Of the four investigated techniques rights of first refusal was the most favored, although respondents thought effective implementation would require careful targeting and a dedicated funding source. Experts agreed this technique was most likely to survive in the political arena. Agricultural conservation pension was also viewed favorably, though it was considered administratively difficult to implement. Several experts thought that, though inchoate, the pension plan could potentially be more cost effective than rights of first refusal. Land preservation tontines were perceived to be an interesting concept, but confusing, difficult to implement, and ill-defined. Term conservation easements were viewed unfavorably because they did not preserve land permanently.
Lori LynchEmail:
  相似文献   
1000.
Allele frequencies for 18 STR autosomal loci (D3S1358, VWA, FGA, D8S1179, D21S11, D18S51, D5S818, D13S317, D7S820, D16S539, TH01, TPOX, CSF1PO, Penta D, Penta E, D19S433, D2S1338 and SE33) were obtained from a sample of 191-500 unrelated individuals from Costa Rica, Central America.  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