全文获取类型
收费全文 | 8036篇 |
免费 | 187篇 |
专业分类
各国政治 | 476篇 |
工人农民 | 213篇 |
世界政治 | 524篇 |
外交国际关系 | 324篇 |
法律 | 4944篇 |
中国共产党 | 2篇 |
中国政治 | 26篇 |
政治理论 | 1618篇 |
综合类 | 96篇 |
出版年
2020年 | 77篇 |
2019年 | 101篇 |
2018年 | 141篇 |
2017年 | 156篇 |
2016年 | 176篇 |
2015年 | 136篇 |
2014年 | 152篇 |
2013年 | 910篇 |
2012年 | 221篇 |
2011年 | 212篇 |
2010年 | 178篇 |
2009年 | 176篇 |
2008年 | 217篇 |
2007年 | 192篇 |
2006年 | 215篇 |
2005年 | 172篇 |
2004年 | 177篇 |
2003年 | 186篇 |
2002年 | 195篇 |
2001年 | 312篇 |
2000年 | 288篇 |
1999年 | 232篇 |
1998年 | 99篇 |
1997年 | 120篇 |
1996年 | 88篇 |
1995年 | 85篇 |
1994年 | 102篇 |
1993年 | 93篇 |
1992年 | 165篇 |
1991年 | 182篇 |
1990年 | 161篇 |
1989年 | 179篇 |
1988年 | 165篇 |
1987年 | 145篇 |
1986年 | 167篇 |
1985年 | 129篇 |
1984年 | 130篇 |
1983年 | 132篇 |
1982年 | 82篇 |
1981年 | 80篇 |
1980年 | 59篇 |
1979年 | 117篇 |
1978年 | 68篇 |
1977年 | 63篇 |
1976年 | 58篇 |
1975年 | 69篇 |
1974年 | 82篇 |
1973年 | 79篇 |
1972年 | 69篇 |
1971年 | 62篇 |
排序方式: 共有8223条查询结果,搜索用时 15 毫秒
191.
Breana N. Peace M.S. James T. Pokines Ph.D. Peter M. Cummings M.Sc. M.D. Allen G. Harbaugh Ph.D. 《Journal of forensic sciences》2020,65(5):1416-1423
Hacking trauma is prevalent in forensic cases involving genocide and dismemberment, but research into the identification of this type of trauma is lacking. The present study examines characteristics of hacking and blunt force skeletal trauma in order to determine if there is a point at which blunt force trauma becomes distinguishable from hacking trauma. Ten implements with a range of blade angles (i.e., the striking surface of the implement) were used in conjunction with a controlled-force hacking device to impact 100 limb bones of white-tailed deer (Odocoileus virginianus). Observations of the trauma included the occurrence and degree of fragmentation, the entrance widths of the impacts, and composite scores of six hacking characteristics, especially the distinctive V-shaped kerf. ANOVA tests and regression analyses were used to assess the relationships between these characteristics and the blade angles. A significant relationship (p-value = 0.011) was found between the composite hacking scores and the blade angles, indicating that blunt force and hacking trauma can be distinguished. The entrance widths of the impacts exhibited a significant relationship with the blade angles (p-value = 0.037). There was also a significant relationship between the visibility of a V-shaped kerf in the bones (p-value = 0.003), with visibility decreasing around the 60° blade angle. These data should assist in establishing guidelines to differentiate hacking and blunt force skeletal trauma in cases where the implement is on a spectrum between sharp and blunt. 相似文献
192.
Alexandra Loukas Ken G. Ripperger-Suhler Karissa D. Horton 《Journal of youth and adolescence》2009,38(6):804-812
This study examined (a) the associations between school connectedness and early adolescent adjustment problems over a 1 year
period and (b) the equivalence of these associations across gender. Five hundred middle school students (53.4% female), initially
in the 6th and 7th grades, participated in the two-wave study. Results from two-group cross-lagged panel analyses were consistent
across boys’ and girls’ data. After controlling for baseline levels of adjustment problems, school connectedness predicted
lower levels of early adolescent conduct problems 1 year later. Regarding the opposite direction of associations, and even
after baseline levels of school connectedness were taken into account, conduct problems predicted lower levels of subsequent
school connectedness. There were no cross-lagged associations between depressive symptoms and school connectedness, although
elevated levels of baseline depressive symptoms predicted higher levels of subsequent conduct problems. Findings elaborate
previous research by demonstrating that early adolescents actively shape the middle school environment.
相似文献
Karissa D. HortonEmail: |
193.
This research analyzes the individual-level factors associated with public support for the private provision of public goods and services. Given that privatization requires the transfer of authority from public to private entities, we argue that beliefs about private companies are an important and overlooked source of heterogeneity in explaining public policy preferences toward privatization. We test this expectation using survey data from the 2014 Cooperative Congressional Election Study. We find that support for privatization is associated with positive beliefs about the motivation of private companies and with favorable views about corporate accountability relative to the accountability of government. Opposition to privatization is associated with beliefs about corporate influence in politics. Preferences for limited government are also associated with support for privatization. These results highlight the potential for beliefs about private companies to serve as a group heuristic in political reasoning and the ability of citizens to make reasoned choices on complex public policy issues. 相似文献
194.
Supreme Court confirmation hearings have been famously called a “vapid and hollow charade” by Elena Kagan. Indeed, perceptions of nominees’ refusal to answer questions about pending cases, prominent political issues, or give any hint of their ideological leanings have become a cornerstone of the modern confirmation process. We investigate the extent to which this reticence to speak of their ideological views, or candor, influences how individuals evaluate the nominee. To this end, we present the results of a survey experiment which examines how support for a hypothetical Supreme Court nominee is affected by information, especially when a nominee is presented to be very forthright or very reticent in answering ideological questions during the confirmation hearings. We find that while partisan compatibility with the president is the main determinant of support for a nominee, nominees who refuse to answer ideological questions can bolster support from respondents who would not support them on partisan grounds. We supplement these findings with observational state-level support data from real nominees over the last 40 years. 相似文献
195.
196.
Hanns Günther Hilpert 《Asia Europe Journal》2018,16(4):439-447
After more than 4 years of negotiations, Japan and the EU have reached an agreement for bilateral free trade. The intended liberalization of trade in goods, agriculture, and services would create the world’s largest free trade area. Japan and Europe are sending a strong signal against protectionism and in favor of free trade and modernizing global trade rules. While free trade in the transatlantic and the transpacific context will remain an illusion for some time to come, the Japan-EU Economic Partnership Agreement (JEEPA) is a realistic option for trade partners at the western and eastern side of the Eurasian continent. The expected overall positive effects of JEEPA should not obscure the limitations and risks of the intended trade integration. There will be economic losers of the agreement both in Europe and in Japan. There is plenty of fuel for political and social conflict. And in light of the many informal barriers, market access to Japan will remain extremely difficult for European companies. Beyond trade policy, JEEPA has a political dimension, too. It shows the political will to counteract economic disintegration and the loss of political substance in the bilateral relationship. The aim is to intensify cooperation, which would benefit both sides economically and politically. 相似文献
197.
Scraping by: Income and Program Participation After the Loss of Extended Unemployment Benefits 下载免费PDF全文
Many Unemployment Insurance (UI) recipients do not find new jobs before exhausting their benefits, even when benefits are extended during recessions. Using Survey of Income and Program Participation (SIPP) panel data covering the 2001 and 2007 to 2009 recessions and their aftermaths, we identify individuals whose jobless spells outlasted their UI benefits (exhaustees) and examine household income, program participation, and health‐related outcomes during the six months following UI exhaustion. For the average exhaustee, the loss of UI benefits is only slightly offset by increased participation in other safety net programs (e.g., food stamps), and family poverty rates rise substantially. Self‐reported disability also rises following UI exhaustion. These patterns do not vary dramatically across household demographic groups, broad income level prior to job loss, or the two business cycles. The results highlight the unique, important role of UI in the U.S. social safety net. 相似文献
198.
Jeffrey G. Karam 《Intelligence & National Security》2017,32(6):693-709
Why were American officials caught by surprise with the military coup and later revolution in Iraq on 14 July 1958? Drawing on American intelligence and diplomatic records as well as multilingual sources, this article argues that the US intelligence failure is the product of two factors: the collection of information from too few and too similar human sources of intelligence in Iraq’s ruling regime, and the unreceptivity of US officials to assessing new information and their unwillingness to update assessments of local Iraqi developments. It revisits America’s intelligence failure in Iraq and suggests important lessons for the study of intelligence. 相似文献
199.
Robin H. Lemaire Keith G. Provan Liesbeth Mercken Scott J. Leischow 《International Public Management Journal》2017,20(3):467-488
The research reported here is an analysis of the evolution of the relationships that comprise a single public health network, focusing especially on the position of the network administrative organization (Provan and Kenis 2008) in the flow of knowledge among a large number of organizations providing similar services. Our study examines the North American Quitline Consortium (NAQC), a multi-sector network that spans the US and Canada and whose members provide telephone-based tobacco cessation services to anyone interested in quitting smoking. Data were collected using web-based surveys at three different points of time. Implications are discussed for network organizing, for both theory and practice, focusing especially on the importance of the network administrative organization in shaping the evolution of the whole network information flow. 相似文献
200.
Cultural Penetration and Punctuated Policy Change: Explaining the Evolution of U.S. Energy Policy 下载免费PDF全文
Punctuated equilibrium theory (PET) suggests that the policy process is characterized by long periods of incremental change and short periods of punctuated change. The impetus for the latter is usually a focusing event that breaks open policy monopolies, allowing for major changes in legislative decision making. While a burgeoning body of literature, a shortcoming in the PET literature is that it has yet to explain why focusing events and subsequent breakdowns in policy monopolies sometimes fail to result in punctuated policy. We integrate theories on cultural change with punctuated equilibrium to explain why focusing events do not always result in the dramatic policy changes that we might expect. Specifically, we use the context of national energy policy and the lexical database, Google Ngram Viewer, to trace punctuating energy‐related events and the occurrence or lack thereof subsequent policy change from 1952 to 2000. 相似文献