全文获取类型
收费全文 | 3305篇 |
免费 | 117篇 |
专业分类
各国政治 | 206篇 |
工人农民 | 149篇 |
世界政治 | 262篇 |
外交国际关系 | 250篇 |
法律 | 1431篇 |
中国政治 | 47篇 |
政治理论 | 1024篇 |
综合类 | 53篇 |
出版年
2023年 | 30篇 |
2022年 | 17篇 |
2021年 | 35篇 |
2020年 | 53篇 |
2019年 | 92篇 |
2018年 | 116篇 |
2017年 | 126篇 |
2016年 | 126篇 |
2015年 | 99篇 |
2014年 | 130篇 |
2013年 | 485篇 |
2012年 | 128篇 |
2011年 | 105篇 |
2010年 | 87篇 |
2009年 | 99篇 |
2008年 | 101篇 |
2007年 | 122篇 |
2006年 | 103篇 |
2005年 | 86篇 |
2004年 | 101篇 |
2003年 | 95篇 |
2002年 | 85篇 |
2001年 | 61篇 |
2000年 | 58篇 |
1999年 | 51篇 |
1998年 | 45篇 |
1997年 | 39篇 |
1996年 | 43篇 |
1995年 | 45篇 |
1994年 | 46篇 |
1993年 | 48篇 |
1992年 | 42篇 |
1991年 | 39篇 |
1990年 | 23篇 |
1989年 | 40篇 |
1988年 | 25篇 |
1987年 | 32篇 |
1986年 | 28篇 |
1985年 | 34篇 |
1984年 | 36篇 |
1983年 | 33篇 |
1982年 | 35篇 |
1981年 | 30篇 |
1980年 | 25篇 |
1979年 | 14篇 |
1978年 | 18篇 |
1977年 | 13篇 |
1975年 | 16篇 |
1974年 | 12篇 |
1973年 | 17篇 |
排序方式: 共有3422条查询结果,搜索用时 15 毫秒
151.
A simple technique is presented for the longitudinal sectioning of hair samples without the need for any embedding medium. The technique applies to single hair samples that are placed in a groove of a particular depth and can either be scraped or cut to the desired level. Planar sections are obtained that reveal the internal structure of the sample and are ideal for the application of surface analytical techniques for the study of internal transverse and longitudinal distributions of xenobiotics. 相似文献
152.
Murder-suicide in New Hampshire, 1995-2000 总被引:1,自引:0,他引:1
Combined murder-suicide is defined as homicide(s) followed by the perpetrator's suicide within 1 week of the homicide(s). This phenomenon is observed worldwide with generally similar incidence rates. The authors report data from New Hampshire, a population distinguished from those in previous United States studies by its location, racial homogeneity, nonurban character, and low homicide rate. Sixteen murder-suicide events occurred in New Hampshire between October 1995 and October 2000. This represents an incidence of 0.26 per 100000 person-years, a rate similar to previously reported values. Murder-suicide events accounted for 14.7% of all homicides in the state, higher than previous studies but not unexpected in view of the state's lower homicide rate. Most perpetrators were male (94%), and most victims were female (88%), often in a spousal or consortial relationship. Firearms accounted for the majority of deaths. Various cofactors are examined, and a comparison of two recently proposed classification systems is discussed. 相似文献
153.
Researchers are currently seeking antecedents of psychopathy among children and adolescents. Instruments developed for this purpose are likely to be used in the future in ways that may have serious implications for youths in delinquency and criminal cases. In this regard, and because the concept and measurement of psychopathy have been developed in reference to adults, there is reason to be concerned about potential developmental sources of false positives when measuring psychopathic traits in juvenile offenders. We provide the basis for our concern, as well as standards regarding the types of research evidence that should be provided before psychopathy measures are accepted for use in juvenile forensic assessments. 相似文献
154.
To investigate socioemotional influences on children's eyewitness accuracy, we examined children's reports for activities they were motivated to conceal. Forty-eight 3–6-year-old children participated in a standardized play session with their mothers. Half of the children were told by an experimenter not to play with certain toys, but did so at the urging of their mothers, who told their children to keep the play activities secret. The remaining children were not restricted from playing with the toys, nor told by their mothers to keep the play activities secret. Later, all children were interviewed about the activities with free narrative and detailed questions. Half were given an interview that consisted of highly suggestive questions; half were given an interview consisting of specific, less suggestive questions. Results indicated that older children who were instructed to keep events secret withheld more information than did older children not told to keep events secret. Younger children's reports were not significantly affected by the secret manipulation. There were no significant effects associated with interview type. We discuss implications for understanding the development of children's knowledge and use of secrecy, and applications of the research to issues that arise when child witnesses give reports in legal contexts. 相似文献
155.
156.
Two fatalities due to unusual impalement injuries are reported. (1) A large branch broken off during a storm had entered a passing car and perforated the chest of the driver and the back of the seat. The chest organs were grossly lacerated. The car was subsequently stopped by another tree and this second impact removed the wood from the body. (2) A man suffered anorectal impalement by the leg of a stool turned upside down. He had introduced one stool leg into his anus for sexual stimulation and fell onto it. This resulted in a wound channel 36 cm long including perforation of the rectum, urinary bladder, mesentery, transverse mesocolon and liver. Before autopsy, the mode of death was unclear because the man had removed the stool leg himself, his wife had hidden the stool from the scene, and there were no relevant external injuries. In both cases, a reliable reconstruction required investigation of the scene and consideration of extremely unlikely circumstances or of bizarre human activities. 相似文献
157.
What Do We Know and Need to Know about the Environmental Outcomes of Collaborative Management? 总被引:2,自引:0,他引:2
Many tout the benefits of collaborative environmental management as an alternative to centralized planning and command and control regulation, but the excitement over collaborative processes has not been matched by evidence that these processes actually improve the environment. The most crucial question in collaborative environmental management remains unanswered and often unasked: To what extent does collaboration lead to improved environmental outcomes? We know much about why collaboration is occurring and how collaborative processes and outputs vary. The primary goal of future research on collaborative environmental management should be to demonstrate whether collaboration improves environmental conditions more than traditional processes and newer market-based processes. Collaboration is not a panacea; it is a choice that policy makers and public managers should make based on evidence about expected outcomes. 相似文献
158.
Changing Sides or Changing Minds? Party Identification and Policy Preferences in the American Electorate 总被引:6,自引:0,他引:6
Scholars have long debated the individual-level relationship between partisanship and policy preferences. We argue that partisanship and issue attitudes cause changes in each other, but the pattern of influence varies systematically. Issue-based change in party identification should occur among individuals who are aware of party differences on an issue and find that issue to be salient. Individuals who are aware of party differences, but do not attach importance to the issue, should evidence party-based issue change. Those lacking awareness of party differences on an issue should show neither effect. We test our account by examining individuals' party identifications and their attitudes on abortion, government spending and provision of services, and government help for African Americans using the 1992-94-96 National Election Study panel study, finding strong support for our argument. We discuss the implications of our findings both for the microlevel study of party identification and the macrolevel analysis of partisan change. 相似文献
159.
Thomas C. Ratliff 《Public Choice》2006,126(3-4):343-355
In selecting a committee, voters are often concerned with the over all composition of the committee rather than simply selecting a single individual as their representative. We give two examples of elections at Wheaton College in Massachusetts that illustrate the complexity of preferences that voters may have for the relationships among the individual candidates. These preferences cannot be separated into preferences on the individual candidates and are not detectable from only a voter's top-ranked committee. We outline the questions this raises for the design of committee elections in general and propose directions for future work. 相似文献
160.
Ryan C. Walker 《Citizenship Studies》2006,10(4):391-411
State-society relations around low-cost housing in Canada changed from a period of strong federal leadership centred on social rights to a period of state retrenchment. A coalition of housing stakeholders from the public, private, and voluntary sectors self-organized in Winnipeg to create new low-cost housing following the 1993 discontinuation of federal social housing programs. This move toward urban citizenship was not received in the same way by Aboriginal peoples pursuing a distinctive set of rights centred on self-determination alongside common social (housing) goals. While Aboriginal rights are given regard at the federal level, they were not embedded in localized citizenship processes. Expanding the theorization of urban citizenship, the empirical results in this article reveal that discourses of democratic racism and cultural neutrality permeate mainstream views, running counter to Aboriginal citizenship pursuits. 相似文献