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   2618篇
  免费   41篇
各国政治   157篇
工人农民   69篇
世界政治   229篇
外交国际关系   197篇
法律   1065篇
中国政治   18篇
政治理论   902篇
综合类   22篇
  2023年   15篇
  2020年   35篇
  2019年   38篇
  2018年   58篇
  2017年   67篇
  2016年   74篇
  2015年   53篇
  2014年   53篇
  2013年   397篇
  2012年   42篇
  2011年   59篇
  2010年   56篇
  2009年   65篇
  2008年   70篇
  2007年   61篇
  2006年   75篇
  2005年   68篇
  2004年   85篇
  2003年   75篇
  2002年   69篇
  2001年   50篇
  2000年   44篇
  1999年   41篇
  1998年   55篇
  1997年   40篇
  1996年   35篇
  1995年   55篇
  1994年   46篇
  1993年   48篇
  1992年   34篇
  1991年   37篇
  1990年   43篇
  1989年   44篇
  1988年   40篇
  1987年   41篇
  1986年   42篇
  1985年   35篇
  1984年   44篇
  1983年   33篇
  1982年   36篇
  1981年   24篇
  1980年   23篇
  1979年   15篇
  1978年   30篇
  1977年   24篇
  1976年   21篇
  1975年   16篇
  1974年   28篇
  1973年   20篇
  1969年   16篇
排序方式: 共有2659条查询结果,搜索用时 15 毫秒
981.
    
This paper tests the fidelity of a recent method that used the NHANES III dataset as a proxy to estimate total body mass from stature and bi‐iliac breadth in U.S. White males and females. The bi‐iliac breadths of 230 males and 152 females identified as non‐Hispanic U.S. White from the Bass Donated Skeletal Collection were measured, and along with stature from predonor paperwork, total body mass estimates were calculated and then compared to body masses recorded on predonor paperwork. Male and female samples were subdivided by body mass index (BMI [kg/m2]) categories established by the World Health Organization. Our results suggest that total body mass estimates can be accurately assessed provided that the individual is within 18.50 ≤ BMI ≤ 29.99 for White males and 18.50 ≤ BMI ≤ 24.99 for White females. Recommendations on how to report total body mass estimates are also presented.  相似文献   
982.
983.
    
Both clinicians and forensic practitioners should distinguish parental alienation (rejection of a parent without legitimate justification) from other reasons for contact refusal. Alienated children—who were not abused—often engage in splitting and lack ambivalence with respect to the rejected parent; children who were maltreated usually perceive the abusive parent in an ambivalent manner. The purpose of this study was to assess the usefulness of the Parental Acceptance–Rejection Questionnaire (PARQ) in identifying and quantifying the degree of splitting, which may assist in diagnosing parental alienation. Results showed that severely alienated children engaged in a high level of splitting, by perceiving the preferred parent in extremely positive terms and the rejected parent in extremely negative terms. Splitting was not manifested by the children in other family groups. The PARQ may be useful for both clinicians and forensic practitioners in evaluating children of divorced parents when there is a concern about the possible diagnosis of parental alienation.  相似文献   
984.
    
This case shows an unexpected midline glioma found at autopsy. Two siblings were riding on a single bicycle on the side of a road. The 13‐year‐old brother was seated and steering the bicycle, while the 14‐year‐old sister held onto the back. The bicycle veered left into traffic and was struck by a vehicle. The siblings were admitted to the local Level 1 trauma center, but both later succumbed to injuries. Autopsies were performed on the children, including brains for neuropathologic evaluation. The brother was found to have an infiltrating astrocytoma located in the left middle cerebellar peduncle, with extension to the pons and medulla. His hospital course included several imaging studies using CT and MRI modalities. However, this lesion was not identified until the postmortem neuropathologic examination. This rare case shows the continued need for postmortem autopsy and the current limitations of medical imaging.  相似文献   
985.
Since 1957, the Department of Justice of Canada has regularly altered the wording of some sections of the Constitution Act, 1867 in its consolidated versions of the Constitution of Canada, even though neither the Westminster Parliament nor the Parliament of Canada had ever amended these provisions themselves or delegated to the executive the authority to make changes on their behalf. The Department of Justice refers to its practice of altering the text of the Constitution of Canada as ‘indirect amendment’. However, since the Constitution Act, 1982 states categorically that the Constitution of Canada can only be validly amended through one of its five amending formulas, the Department of Justice’s technocratic approach to ‘indirect amendment’ is almost certainly unconstitutional.?Either the Department of Justice should restore the original wording of the text of these sections in its subsequent consolidations of the Constitution Acts and relegate the updated figures or other commentary to explanatory footnotes. Alternatively, the Parliament of Canada should update these sections itself, directly, as a Section 44 Constitutional Amendment. The rule of law depends upon following the Constitution of Canada's amendment procedures properly.  相似文献   
986.
987.
    
The Indo-Pacific region's security landscape is unfolding in highly uncertain and potentially explosive ways. The postwar American-led network of bilateral alliances – underpinned by concrete guarantees of extended deterrence and containment – is now yielding to a more diverse set of alignments and coalitions to manage an increasingly complex array of regional security issues. Multilateralism and minilateralism have emerged as two increasingly prominent forms of such cooperation. Minilateralism's informality and flexibility appeals to those who are sceptical about multilateralism's traditional focus on norm adherence and community-building even as great power competition in the Indo-Pacific is sharply intensifying. However, minilateralism's track record in the region is underdeveloped. The potential for this policy approach to be applied by the United States and its regional security partners as an enduring and credible means of diplomatic and security collaboration in the region will remain unfulfilled as long as the Trump administration's own geopolitical orientation remains uncertain.  相似文献   
988.
    
Trust is important to the institutions that make societies successful. Globally, Indigenous peoples are actively building institutions for self‐governance, but there remains little empirical work on trust in this context. To address this gap, we use a mixed methods approach to explore three levels of trust among individual members from three related, but politically distinct First Nations (Indigenous peoples) in British Columbia, Canada. British Columbia offers a unique and dynamic context to explore trust and its relationship with the diverse institutional choices among First Nations. Survey results show that trust is low among respondents and individual variables predictive of trust in mainstream contexts, like education and employment, are not determinative. However, interpersonal trust and political trust were highest in the First Nation most active in institution building, and who linked this with a cultural revitalization narrative. Interviews suggested a bidirectional relationship between individual and collective drivers of trust in this context.  相似文献   
989.
    
In laboratory studies of the pig Sus scrofa, hematocrit has consistently increased after conducted‐electrical‐weapon (CEW) exposures, possibly due to contraction of the spleen. Splenectomized animals and intact sham control animals were exposed, each for 30 sec, to a benchtop‐produced electrical waveform of net charge levels similar to those of some CEWs. Changes in the blood were compared statistically. Hematocrit increased significantly in both splenectomized and sham animals. There were no significant main‐effect differences between values of hematocrit from the two groups. There were, however, significant interactive effects of time and splenectomy for hematocrit, red blood cell count, and hemoglobin. After peak values were reached for these variables, values returned toward baseline levels more slowly in splenectomized animals. This may have been due to the lack of a spleen to sequester red blood cells (thereby resulting in more cells remaining in the general circulation), unlike sham animals with intact spleens.  相似文献   
990.

Purpose

Much of what is known regarding the transition away from crime is limited to young adulthood and specific life events and samples of non-serious offenders comprised mainly of white males.

Methods

The current study assesses the potential links between educational achievement, post-release schooling, and re-arrest for a cohort of 4,147 incarcerated youths drawn from 115 Florida juvenile institutions and followed for two years post-release.

Results

Incarcerated youths with higher levels of educational achievement are more likely to return to school after release, and those youths who returned to and attended school regularly were less likely to be rearrested within 12 and 24 months. Moreover, among youths who were rearrested, those youth who attended school regularly following release were arrested for significantly less serious offenses compared to youths who did not attend school or attended less regularly.

Conclusions

The study concludes with discussion of the importance of educational achievement as an important turning point for juvenile offenders as they transition into young adulthood.  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