全文获取类型
收费全文 | 9984篇 |
免费 | 302篇 |
专业分类
各国政治 | 649篇 |
工人农民 | 434篇 |
世界政治 | 810篇 |
外交国际关系 | 440篇 |
法律 | 5658篇 |
中国共产党 | 2篇 |
中国政治 | 145篇 |
政治理论 | 2052篇 |
综合类 | 96篇 |
出版年
2020年 | 157篇 |
2019年 | 164篇 |
2018年 | 239篇 |
2017年 | 249篇 |
2016年 | 247篇 |
2015年 | 231篇 |
2014年 | 226篇 |
2013年 | 1235篇 |
2012年 | 254篇 |
2011年 | 340篇 |
2010年 | 260篇 |
2009年 | 278篇 |
2008年 | 280篇 |
2007年 | 252篇 |
2006年 | 255篇 |
2005年 | 230篇 |
2004年 | 249篇 |
2003年 | 262篇 |
2002年 | 186篇 |
2001年 | 380篇 |
2000年 | 363篇 |
1999年 | 309篇 |
1998年 | 162篇 |
1997年 | 117篇 |
1996年 | 118篇 |
1995年 | 108篇 |
1994年 | 117篇 |
1993年 | 111篇 |
1992年 | 168篇 |
1991年 | 164篇 |
1990年 | 154篇 |
1989年 | 151篇 |
1988年 | 170篇 |
1987年 | 165篇 |
1986年 | 165篇 |
1985年 | 151篇 |
1984年 | 152篇 |
1983年 | 158篇 |
1982年 | 97篇 |
1981年 | 69篇 |
1980年 | 82篇 |
1979年 | 101篇 |
1978年 | 81篇 |
1977年 | 69篇 |
1976年 | 68篇 |
1975年 | 60篇 |
1974年 | 50篇 |
1972年 | 53篇 |
1971年 | 55篇 |
1969年 | 56篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
912.
Corinna Jenkins Tucker Genevieve Cox Erin Hiley Sharp Karen T. Van Gundy Cesar Rebellon Nena F. Stracuzzi 《Journal of family violence》2013,28(3):299-310
We describe sibling proactive and reactive aggression in middle and late adolescence. Participants were 8th (n?=?303, M age?=?13.74 years, SD?=?.59) and 12th (n?=?300, M age?=?17.73 years, SD?=?.56) grade adolescents who completed an in-school survey. Findings revealed that these adolescents were significantly more likely to engage in reactive than proactive aggression with their closest-aged sibling. However, 8th grade adolescents reported greater aggression toward their closest-aged sibling than did 12th grade adolescents. In addition, sex composition of the sibling dyad moderated the association between sibling relationship quality (i.e., warmth and rivalry) and both proactive and reactive aggression indicating unique links for brother-brother and older sister-younger brother pairs. 相似文献
913.
J. Mitchell Miller J. C. Barnes Holly Ventura Miller Layla McKinnon 《American Journal of Criminal Justice》2013,38(3):439-456
Though mentoring has emerged as a promising and low-cost intervention for at-risk youth in recent years, the scientific knowledge base on the topic remains under-developed. The current study augments the knowledge base on youth mentoring by analyzing programmatic elements of mentoring programs situated in or adjacent to the juvenile justice system that are predictive of participant success. Poisson regression was utilized to analyze data collected through a national mentoring community saturation survey. Findings indicated that mentoring programs that require more frequent interaction and sustain relationships for longer timeframes realize higher success rates. Similarly, the use of formal mentor training was also observed as indicative of the use of evidence based practices and higher success rates, though likely beyond the logistical and fiscal reach of some local mentoring initiatives. The implications for further research and the mentoring community are discussed. 相似文献
914.
L. C. Miccio-Fonseca 《Journal of family violence》2013,28(6):623-634
Prognostic utility of MEGA ? was evaluated on a sample of 969 male and female youth without history of sexually-related probation or parole violation. Six month follow-up of 334 (34 %) found a new sexually-related probation or parole violation occurred in 28 (8.4 %). ROC findings showed Risk Scale significantly (p?<?.001) predictive of a new violation (AUC?=?.71 [95 % CI?=?.62 to .80]). MEGA ? Risk Scale scores added incremental prognostic utility over demographic variables (p?<?0.001) and resulted in a net reclassification improvement of 31.5 %. Contravention for youth ages 4 to 12 was defined as new reports of sexually abusive behaviors in three or more different locations, or sexual behaviors that included oral, anal, vaginal, direct skin to skin contact, and/or penetration. Post-hoc analysis found 8 youth (21 %) experienced these outcomes. Risk Scale was significantly predictive (AUC?=?.77 [95 % C.I. = .60 to .96; p?=?0.016]). 相似文献
915.
Livia C. Navone 《European Journal of Law and Economics》2013,35(3):409-426
The law and economics literature commonly justifies the state’s taking power on the grounds that it is necessary to overcome holdouts and, thus, allow efficient development projects to move forward (A development project is efficient when the benefit it generates exceeds its cost.). By permitting the government to take private property rights non-consensually, the taking power limits the ability of private property owners to engage in strategic bargaining with the government and puts a cap on their ability to extract payments from the government in exchange for agreeing to transfer their rights. In this paper, I will argue that the standard story is highly incomplete and, therefore, inaccurate. It conveniently ignores the ability of politically powerful groups to block development projects by exercising their de facto veto power over proposed projects. Such groups do not necessarily have rights in any properties directly affected by the project. Once these groups, whom I call “political holdouts”, are added to the analysis, it becomes clear that the payment of just compensation—or any other aspect of eminent domain law and regulatory takings jurissprudence—will not help to remove their opposition and, a fortiori, cannot guarantee efficient development. I will explore the phenomenon of “political holdouts” and analyze its causes. As I will show, political holdouts are ubiquitous. Political holdouts may arise with respect to most of what passes for public policy projects, under either the aegis of eminent domain or the government’s police power, and also with respect to non-NIMBY projects. This observation may seem counterintuitive at first. However, one should consider that efficient development projects create a surplus over which powerful interest groups compete. As should be clear, what is of interest to localities and political groups is not the overall utility of a particular development project, but rather their payoff from it. Municipalities may oppose projects that benefit them simply to increase their share of the overall surplus generated by the project. Hence, the problem I point out is significant and acute. In the remainder of this paper, I will discuss in depth how the problem of political holdouts affected the construction of a fast train line (the Lyon–Torino–Milano–Trieste–Khoper–Ljubljana–Budapest TGV line) in northern Italy. 相似文献
916.
Denis Wegge Heidi Vandebosch Steven Eggermont Ronan Van Rossem Michel Walrave 《European Journal on Criminal Policy and Research》2016,22(2):235-251
The present research adopts a multiple informant approach to identify victims and perpetrators of cyberbullying. Similar approaches have been successfully applied in the field of traditional bullying, and they are highly relevant for studying cyberbullying as well. Three informants can provide key perspectives on cyberbullying incidents: victims, perpetrators, and bystanders. To collect data on these actors, all eighth-grade students in 11 secondary schools were invited to participate in a survey. In total 1458 respondents completed peer-nomination questions on cyberbullying involvement. The results indicated that the prevalence of cyberbullying varied depending on the type of informants that was consulted. In addition, limited overlap was observed between the reports of different informants, resulting in different profiles of victims and perpetrators, depending on the informants that identified them. In sum, different informants tended to have divergent views on cyberbullying, which has important implications. It warrants accurate reporting and critical reflection on the sources of data in cyberbullying research. Moreover, it demonstrates the need to study a more diverse set of informants to advance the understanding of cyberbullying and to enhance prevention efforts. 相似文献
917.
918.
Katrien Symons Sabine Hellemans Mieke Van Houtte Hans Vermeersch 《Journal of family violence》2016,31(6):759-769
Young people who grow up in a violent family context are more vulnerable to become victims of sexual aggression outside the family context. The present study contributes to the understanding of the mechanisms that explain this link among young women by looking at the mediating role of sexual exposure behavior and target vulnerability. Data were used from an online survey among 237 young women aged 16 to 26 (M?=?21.0 years, SD?=?2.75). Experiencing violence from (one of) the parents and to a lesser extent witnessing interparental violence were related to an elevated risk for sexual victimization. Witnessing interparental violence was related to increased target vulnerability but this factor did not mediate the link with sexual victimization. Experiencing parental violence was related to both increased sexual exposure behavior and increased target vulnerability and these factors did mediate the link with sexual victimization. 相似文献
919.
In Why Tolerate Religion?, Brian Leiter argues against the special legal status of religion, claiming that religion should not be the only ground for exemptions to the law and that this form of protection should be, in principle, available for the claims of secular conscience as well. However, in the last chapter of his book, he objects to a universal regime of exemptions for both religious and secular claims of conscience, highlighting the practical and moral flaws associated with it. We believe that Leiter identifies a genuine and important contemporary legal and philosophical problem. We find much to admire in his reasoning. However, we raise questions about two claims that are crucial for his argument. The first claim is that it is not religion as such, but conscience that deserves toleration and respect. The second claim is that respect for religion and conscience demands ‘principled toleration’ but does not entail stronger policies of legal exemptions. Against the first claim, we argue that Leiter does not successfully distinguish religious belief from secular conscience and morality; and he does not explain why secular conscience (which shares many of religious conscience’s epistemic features) deserves respect. Against the second claim, we argue that the most promising theories of legal exemptions are not classical theories of liberal toleration. 相似文献
920.
Blow Flies from Forest Fragments Embedded in Different Land Uses: Implications for Selecting Indicators in Forensic Entomology 下载免费PDF全文
Mirian S. de Souza M.Sc. Mateus Pepinelli Ph.D. Eduardo C. de Almeida M.Sc. Jose M. Ochoa‐Quintero Ph.D. Fabio O. Roque Ph.D. 《Journal of forensic sciences》2016,61(1):93-98
Given the general expectation that forest loss can alter biodiversity patterns, we hypothesize that blow fly species abundances differ in a gradient of native vegetation cover. This study was conducted in 17 fragments across different landscapes in central Brazil. Different land cover type proportions were used to represent landscape structure. In total, 2334 specimens of nine species of Calliphoridae were collected. We used principal component analysis (PCA) to reduce dimensionality and multicollinearity of the landscape data. The first component explained 70%, and it represented a gradient of forest‐pasture land uses. Alien species showed a wide distribution in different fragments with no clear relationship between the abundance values and the scores of PCA axes, whereas native species occurred only in areas with a predominance of forest cover. Our study revealed that certain native species may be sensitive to forest loss at the landscape scale, and they represent a bioindicator in forensic entomology. 相似文献