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   11043篇
  免费   359篇
各国政治   327篇
工人农民   515篇
世界政治   682篇
外交国际关系   363篇
法律   7056篇
中国共产党   36篇
中国政治   138篇
政治理论   2109篇
综合类   176篇
  2021年   68篇
  2020年   173篇
  2019年   152篇
  2018年   234篇
  2017年   269篇
  2016年   315篇
  2015年   255篇
  2014年   258篇
  2013年   948篇
  2012年   279篇
  2011年   319篇
  2010年   249篇
  2009年   310篇
  2008年   372篇
  2007年   374篇
  2006年   368篇
  2005年   343篇
  2004年   331篇
  2003年   277篇
  2002年   269篇
  2001年   376篇
  2000年   351篇
  1999年   271篇
  1998年   172篇
  1997年   116篇
  1996年   146篇
  1995年   126篇
  1994年   135篇
  1993年   129篇
  1992年   200篇
  1991年   252篇
  1990年   216篇
  1989年   202篇
  1988年   226篇
  1987年   203篇
  1986年   229篇
  1985年   193篇
  1984年   164篇
  1983年   163篇
  1982年   105篇
  1981年   123篇
  1980年   101篇
  1979年   103篇
  1978年   91篇
  1977年   78篇
  1976年   66篇
  1975年   65篇
  1974年   68篇
  1973年   78篇
  1971年   51篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
This study examines public opinion in Costa Rica and El Salvador regarding regional integration in Central America. Recent efforts at regional integration as well as the response of the governments of the above countries to those efforts are reviewed. Public opinion toward regional integration is significantly more positive but less structured in El Salvador than in Costa Rica. Differences in the international and domestic contexts help to explain the differential responses in these two countries. Likewise, contextual factors help to account for differences between Central American and European publics in attitudes toward regional integration. Charles L. Davis is associate professor of political science at the University of Kentucky. His interests are Latin American politics and comparative political behavior. Matthew J. Gabel is assistant professor of political science at the University of Kentucky. His interests are European politics and the politics of regional integration. Kenneth M. Coleman is a former professor at the University of Kentucky, the University of North Carolina-Chapel Hill, and the University of New Mexico. His interests are Latin American politics and public opinion.  相似文献   
992.
Demographic and trend analysis of 881 consecutive suicides in blacks and whites is presented. For the years 1975 through 1984, the suicide rate was 15.1/100 000 and did not significantly change. White males were overrepresented in all age groups, had an overall suicide rate of 34.9, and showed a small but statistically significant increase in rate which was not accounted for by any specific age group. White females, in general, were represented in proportion to their prevalence in the population, and those ages 20 to 24 demonstrated an increasing suicide rate which was small. Black males were at highest risk in their twenties, showed no significant trends, and were also represented near their prevalence in the population. Black females of all ages were underrepresented, and had low suicide rates which decreased with time. No significant rate changes were noted for teenagers or the elderly. Firearms was the method of choice in all groups, although methods varied with age, race, and sex, and male children preferred hanging. Small but significant increases were noted for the prevalence of nondrug methods in females and carbon monoxide deaths in white males. Similarities and differences to larger scale studies are discussed. Suicide may have characteristics unique to given geographical areas and pervasive to all areas. The authors advocate study and publication of local data to clarify further the nature of suicide.  相似文献   
993.
The interpretation of bloodstain patterns at crime scenes has received increased attention in recent years. Important to an understanding of this is knowledge of the fundamentals of blood droplet formation and impact dynamics. A review of the literature reveals that a considerable amount of work has been done with aqueous drop dynamics. Workers in the forensic science area seem to have been unaware of this. In addition, some of the most important and comprehensive early work with blood droplet dynamics seems to have been forgotten. It is not cited in more recent publications dealing with bloodstain pattern interpretation. This literature is reviewed and discussed as well. The present study presents results of experiments with blood droplet dynamics and high-speed photographs of blood droplet impacts on stationary target surfaces. Some longstanding misconceptions of importance to forensic scientists engaged in crime scene reconstruction are discussed.  相似文献   
994.
995.
The armamentarium of the forensic thanatologist includes the examiner's subjective assessment of bodily changes together with comprehensive evaluation of environmental and associated factors to estimate the postmortem interval (PMI). Of the various objective means, postmortem accumulation of potassium in vitreous humor is a widely used gauge. In view of the considerable variability inherent in these techniques, an additional marker with greater accuracy would be a welcome supplement to these indices. We have developed a method of estimating PMI from the level of 3-methoxytyramine (3-MT) in the dorsal putamen of the brain. The supernatant of a sample of putamen, sonicated in 6 volumes (weight/volume) of 0.1 M perchloric acid and centrifuged at 51 000 times gravity for 10 min, was analyzed for 3-MT using high-pressure liquid chromatography with electrochemical detection. The change of 3-MT in the putamen is linearly related to the PMI (range: 5.5 to 60 h), irrespective of patient age (1 to 84 years). This observation is attributable to several factors, including high substrate (dopamine) concentration, preservation of catechol-O-methyl transferase activity, and an inactivation of monoamine oxidase activity, as a result of a decrease in tissue pO2.  相似文献   
996.
For the last several centuries, most jurisdictions using capital punishment have had formal or informal rules that prohibit the execution of the mentally ill. In this article, the procedures for such exclusions in Florida are examined. The article begins by attempting to answer the question of why legislators and judges, at least nominally, have prohibited the execution of the mentally ill. Next, Florida's criteria for defining and procedures for excluding mentally ill prisoners are examined and found to be vague. We then turn attention to the ethical problems created by the statute and its implementation that face the participating psychiatrists and the profession. These problems are compounded because the physician's findings are not acted upon by politically neutral authorities and the inmate has no opportunity to challenge the findings with his own panel of experts. Finally, since any exclusion of the mentally ill from execution is temporary and the patient will be executed if he recovers, the dilemmas facing the treatment staff if the death sentence is not commuted to life imprisonment before treatment are discussed.  相似文献   
997.
冯友兰是中国近现代史上著名的哲学家和哲学史家。他从中国文化和中国社会发展方向的前提出发,比较中西文化之间的差异,形成了关于文化问题和社会发展问题的一系列观点。他所提出的以“文化类型”说、“继往开来”说和“道统新续”说为内容的“文化三说”观,对于妥善处理中西文化冲突与融合过程中的时代性和民族性的关系,以及如何弘扬中国传统文化的精华与吸收外国文化的长处等问题,仍然具有积极的现实启迪意义。  相似文献   
998.
999.
In July 2005, the Little Rock, Arkansas, school district implemented a new policy to reorganize its management structure in order to create a more efficient bureaucracy. Using Richard Matland’s ambiguity‐conflict model of policy implementation, the authors examine the implementation of this school reorganization policy. Interviews and surveys were conducted with the superintendent and his executive assistants, school principals, teachers, and staff. In line with Matland’s model, the findings suggest that successful implementation is directly related to the policy characteristics of ambiguity and conflict. However, the authors point to the importance of recognizing particular characteristics for different groups of stakeholders within the policy implementation process. Discrepancies among groups of policy actors in the degree of policy ambiguity and policy conflict lead to strikingly different implementation strategies.  相似文献   
1000.
Chloroquine concentrations in blood and tissues were examined in overdose and non-overdose cases to determine appropriate ranges for interpretation. Twenty-nine literature overdose cases and 8 non-overdose literature cases were compared with this laboratory's findings. The results indicate significant postmortem redistribution of chloroquine. Combining this laboratory's results and the literature results indicates that using a liver concentration of 150 mg/kg as a cutoff between overdose and non-overdose concentrations properly identified 30 of the 34 published cases containing liver chloroquine and 19 of the 20 presented cases.  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