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   1478篇
  免费   79篇
各国政治   94篇
工人农民   68篇
世界政治   114篇
外交国际关系   114篇
法律   814篇
中国政治   12篇
政治理论   331篇
综合类   10篇
  2023年   22篇
  2022年   21篇
  2021年   17篇
  2020年   41篇
  2019年   60篇
  2018年   51篇
  2017年   78篇
  2016年   81篇
  2015年   50篇
  2014年   71篇
  2013年   217篇
  2012年   68篇
  2011年   48篇
  2010年   49篇
  2009年   46篇
  2008年   56篇
  2007年   74篇
  2006年   58篇
  2005年   61篇
  2004年   43篇
  2003年   41篇
  2002年   49篇
  2001年   24篇
  2000年   22篇
  1999年   26篇
  1998年   14篇
  1997年   14篇
  1996年   9篇
  1995年   15篇
  1994年   10篇
  1993年   3篇
  1992年   22篇
  1991年   7篇
  1990年   6篇
  1989年   11篇
  1988年   8篇
  1987年   6篇
  1986年   7篇
  1985年   7篇
  1984年   3篇
  1983年   7篇
  1982年   4篇
  1981年   2篇
  1980年   4篇
  1975年   3篇
  1973年   3篇
  1969年   4篇
  1966年   3篇
  1962年   1篇
  1955年   1篇
排序方式: 共有1557条查询结果,搜索用时 15 毫秒
861.
862.
863.
Pulmonary embolism can be observed at any age, but it occurs very rarely in the infant. The authors report the case of a 12-month-old boy who suddenly died during clinical improvement of gastroenteritis associated with otitis. Autopsy showed signs of dehydration and acute left pulmonary embolism, which was the cause of death. Thrombosis of the inferior vena cava extending into renal veins was seen. In this case, plasma hyperosmolality caused by dehydration might have favored the formation of venous thromboses. The various risk factors of pulmonary embolism in the child are discussed, including genetic factors.  相似文献   
864.
Jakob de Haan 《Public Choice》1997,93(3-4):395-426
This paper reviews research on central banking and monetary policy, with special emphasis on the position of the future European Central Bank. Nowadays, it is often thought that an independent central bank with an explicit mandate to aim for price stability constitutes an important institutional device to assure price stability. Indeed, the ECB will be one of the most independent central banks as follows from the codings of various indicators measuring legal independence. Still, it does not follow straightforwardly from the literature that the Statute of the ECB is optimal. It is also argued that the accountability of the ECB is poorly arranged for in comparison with that of several national central banks. Finally, the discussion about the monetary strategy of the ECB is reviewed.  相似文献   
865.
在西部大开发的战略性基点上 ,具有核心意义的问题不是区域经济问题而是民族发展问题。西部少数民族问题与农民问题的交织 ,使城乡结构调整与城市化发展成为实现西部大开发战略意义的最基本和最迫切的问题。应突破以往的城市化思路和模式 ,以制度创新作为整个战略选择的基点并把中等城市的发展作为主攻方向 ,才能真正实现西部大开发的战略性意义  相似文献   
866.
A 9-locus microsatellite framework (minimal haplotype), previously developed for forensic purposes so as to facilitate stain analysis, personal identification and kinship testing, has been adopted for the establishment of a large reference database of male European Y-chromosomal haplotypes. The extent of population stratification pertaining to this database, an issue crucial for its practical forensic application, was assessed through analysis of molecular variance (AMOVA) of the 20 regional samples included. Despite the notion of some significant haplotype frequency differences, which were found to correlate with known demographic and historic features of Europeans, AMOVA generally revealed a high level of genetic homogeneity among the populations analyzed. Owing to their high diversity, however, accurate frequency estimation is difficult for Y-STR haplotypes when realistic (i.e. moderately sized) datasets are being used. As expected, strong pair-wise and higher order allelic associations were found to exist between all markers studied, implying that haplotype frequencies cannot be estimated as products of allele frequencies. A new extrapolation method was therefore developed which treats haplotype frequencies as random variables and generates estimates of the underlying distribution functions on the basis of closely related haplotypes. This approach, termed frequency 'surveying', is based upon standard population genetics theory and can in principle be applied to any combination of markers located on the Y-chromosome or in the mitochondrial genome. Application of the method to the quality assured reference Y-STR haplotype database described herein will prove very useful for the evaluation of positive trace-donor matches in forensic casework.  相似文献   
867.
An analysis is given of Kantorovich's method of resolving multipliers. It is shown that the method is equivalent to a parametric method but that it is also equivalent with the simplex method with a special rule for the choice of the new basic variable.  相似文献   
868.
Child neglect, the failure to adequately meet a youngster's care needs, is the most frequent form of child maltreatment reported to welfare authorities. However, there have been few empirical reports of treatment outcomes for adjudicated, child neglectful parents. In the current study, an initial assessment of three neglectful parents revealed substantial deficits in cognitive problem-solving skills related to child care judgment. Treatment, consisting of modeling, shaping, practice, and feedback was used to improve each parent's child care problem-solving skills in a multiple baseline design. Skill enhancement was also found for untrained (generalization) problem situations, and independent caseworker ratings of each family's functioning provided external validation of the intervention's clinical impact.  相似文献   
869.
A substantial minority (35%) of the Dutch population is in favor of capital punishment. In this paper, it is argued that in a staunchly abolitionist country such as The Netherlands, the existence and perseverance of such support can be better understood and explained by conceiving of capital punishment support in attitudinal terms as part of a law and order syndrome. Death penalty attitudes are analyzed by means of hierarchic logistic regression analysis. It is shown that support can be modeled quite well, partly in terms of general attitudes to criminal justice, partly in terms of political and sociodemographic parameters. Within the criminal justice attitudes complex, more support is found among those endorsing harsh treatment of offenders, those willing to grant far-reaching powers to justice authorities, those believing that the government is not delivering on the topic of crime fighting, and those who are concerned about the level of crime. Within the political context, more support is enlisted among people who abstain from voting and those who vote at either extreme of the political spectrum as opposed to central parties' supporters. In sociodemographic segments it is the younger and poorly educated who are the strongest supporters of capital punishment. It is suggested that endorsing capital punishment can be better understood as an expressive act, displaying dissatisfaction with judicial and political elites in the country.  相似文献   
870.
We report the results of Spanish and Portuguese working group (GEP) of International Society of Forensic Genetics (ISFG) Collaborative Exercise 2001-2002 on mitochondrial DNA (mtDNA) analysis. 64 laboratories from Spain, Portugal and several Latin-American countries participated in this quality control exercise. Five samples were sent to the participating laboratories, four blood stains (M1-M4) and a sample (M5) consisting of two hair shaft fragments. M4 was non-human (Felis catus) in origin; therefore, the capacity of the labs to identify the biological source of this sample was an integral part of the exercise. Some labs detected the non-human origin of M4 by carrying out immuno-diffussion techniques using antihuman serum, whereas others identified the specific animal origin by testing the sample against a set of animal antibodies or by means of the analysis of mtDNA regions (Cyt-b, 12S, and 16S genes). The results of the other three human blood stains (M1-M3) improved in relation to the last Collaborative Exercises but those related to hairs yielded a low rate of success which clearly contrasts with previous results. As a consequence of this, some labs performed additional analysis showing that the origin of this low efficiency was not the presence of inhibitors, but the low quantity of DNA present in these specific hair samples and the degradation.As a general conclusion the results emphasize the need of external proficiency testing as part of the accreditation procedure for the labs performing mtDNA analysis in forensic casework.  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