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   26059篇
  免费   548篇
各国政治   989篇
工人农民   1703篇
世界政治   1729篇
外交国际关系   923篇
法律   15248篇
中国共产党   2篇
中国政治   83篇
政治理论   5741篇
综合类   189篇
  2020年   229篇
  2019年   292篇
  2018年   1577篇
  2017年   1547篇
  2016年   1424篇
  2015年   371篇
  2014年   391篇
  2013年   1889篇
  2012年   621篇
  2011年   1316篇
  2010年   1311篇
  2009年   956篇
  2008年   1171篇
  2007年   1149篇
  2006年   476篇
  2005年   487篇
  2004年   603篇
  2003年   588篇
  2002年   433篇
  2001年   722篇
  2000年   664篇
  1999年   529篇
  1998年   309篇
  1997年   270篇
  1996年   234篇
  1995年   236篇
  1994年   274篇
  1993年   232篇
  1992年   355篇
  1991年   390篇
  1990年   347篇
  1989年   358篇
  1988年   330篇
  1987年   347篇
  1986年   348篇
  1985年   345篇
  1984年   306篇
  1983年   335篇
  1982年   271篇
  1981年   241篇
  1980年   186篇
  1979年   261篇
  1978年   176篇
  1977年   156篇
  1976年   137篇
  1975年   126篇
  1974年   142篇
  1973年   125篇
  1972年   117篇
  1971年   96篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
181.
More than a decade after NAFTA (North American Free Trade Agreement) entered into force, the environmental effects of agricultural trade liberalization in Mexico are still controversial, emerging, and not fully understood. This paper contributes to the literature that aims to explore trends in input use in the agricultural sector in Mexico during the post-NAFTA period among both commercial/industrial and traditional/rainfed farmers, and examines the influence of the national and multilateral institutional framework on these outcomes. We decompose the post-NAFTA agricultural production data into scale, technique and composition effects to estimate the impact that trade liberalization has had on the use of fertilizer and land use, two key agricultural inputs for which reliable aggregate data is available. We conclude that among commercial farmers patterns of crop type specialization and significant technological improvements have led to some declines in fertilizer use but they have been offset by growth in fertilizer use associated with growing agricultural output. Among traditional farmers increased output and specialization in land-intensive grain crops are contributing to an increase in land under cultivation and technological improvements show the potential, but not yet not the strength, to counteract these effects. We analyse the environmental institutional framework and rural development plans, observing that institutional weaknesses have, in several instances, reduced the environmental benefit of technique and composition effects. We conclude with recommendations about how the Mexican agricultural sector might reap the environmental benefits of international agricultural trade.  相似文献   
182.
In two recent cases, Grutter v. Bollinger, 539 U.S. 306. (2003) and Gratz v. Bollinger, 539 U.S. 244. (2003), the Supreme Court held that the Equal Protection Clause permitted state schools to use race-sensitive admissions in order to obtain the educational benefits that flow from a diverse student body. The diversity-based argument for race-sensitive admissions, scholarships, awards, and other opportunities at universities should have been rejected because it does not consider the full range of costs and benefits and because the more narrow educational effects probably weigh against such programs. However, this does not suggest that applicants’ race, ethnicity, and gender should be ignored. Rather the same consideration that led to the defeat of the diversity argument, i.e., reasoning capacity, supports the consideration of demographic factors. However, attention to such factors further undermines the consequentialist case for affirmative action.  相似文献   
183.
184.
The end of the twentieth century was marked by a sea change in global governance in the realm of intellectual property rights (IPRs). Whereas countries historically retained substantial autonomy with regard to what they defined as intellectual "property" and the rights granted to the owners of intellectual property, the 1990s witnessed the establishment of new global obligations regarding national practices. This paper focuses on the case of software "piracy" to assess the mechanisms by which the new global obligations for the treatment of IPRs are transmitted from the international to the national levels. We first consider a set of national-level factors that many scholars have shown to be important determinants of IPR policy. We then supplement the standard emphasis on domestic factors with an analysis of new transnational factors: countries' multilateral obligations under the World Trade Organization's (WTO) Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS) and bilateral pressures from the United States to increase the protection of IPRs. Population-averaged panel data models are used to assess the effects of these national and transnational determinants on levels of software piracy in 80 countries from 1994 to 2002. Our results indicate that membership in the WTO and bilateral pressures from the United States—particularly pressures that offer reciprocal concessions—lead to substantial increases in levels of protection in rich and poor countries. There is, in short, a new international political economy of intellectual property.  相似文献   
185.
This article examines the impact of the Human Rights Act on the government's constitutional proposals for reform of the role of the Lord Chancellor and the appointment of the judiciary. It also looks at the uncertain acceptance of a 'human rights' culture by the department charged with lead responsibility for its implementation. It concludes that the government went further than was required in reforming the role of the Lord Chancellor. As a consequence, considerable - and possibly undue – weight now hangs on the enlarged role of the Lord Chief Justice. Meanwhile, the Department of Constitutional Affairs and its ministers have rejected the 'rule of law' brief of the Lord Chancellor without clarity as to where such responsibilities might now be adequately located within government.  相似文献   
186.
187.
Eight homicidal youths were assessed for language disorders and psychiatric diagnoses using a battery of standardized language tests and the Diagnostic Interview for Children and Adolescents. Both language disorders and Diagnostic and Statistical Manual III-R psychiatric diagnoses were present in all subjects.  相似文献   
188.
189.
Although physical punishment has been studied for decades, there are gaps in the literature regarding frequently used form, context, and cross cultural differences. A comparison was made using 227 college students in the United States and Japan, who were presented with four scenarios and surveyed regarding attitudes toward physical punishment, perceptions of appropriate discipline methods, and past experience with physical punishment. Japanese and U.S. respondents reported similar personal experience with physical punishment (Japanese 86%, U.S. 91%). However, U.S. respondents reported a higher likelihood of being hit with an object than did Japanese respondents. For U.S. respondents, the bottom and the hand were the top two sites on the body used for physical punishment, whereas the head and the face were the top two places for the Japanese sample. Unlike U.S. respondents, type of child misbehavior was found to have an impact on Japanese respondents’ views on the appropriate discipline method.  相似文献   
190.
Within the context of transboundary disputes, this paper seeks to determine which liability concept, negligence or strict liability, performs better when assets are secure against foreign claims for transboundary damages. Our results indicate that, if assets are hidden from foreign claims, strict liability will not implement the socially optimal outcome, but neither will negligence. However, even though the socially optimal outcome is not always achieved, strict liability weakly dominates negligence. These results suggest that the harmonization of statues that deal with transboundary pollution should be based on strict liability not negligence. JEL classification K32 · Q5 Smith and Eckert both thank SSHRC of Canada for financial assistance. We thank two referees for valuable comments that greatly improved the paper and Matt Smith for his research assistance. All remaining errors are our responsibility.  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