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   1819篇
  免费   59篇
各国政治   151篇
工人农民   59篇
世界政治   93篇
外交国际关系   64篇
法律   1244篇
中国政治   11篇
政治理论   245篇
综合类   11篇
  2022年   11篇
  2020年   35篇
  2019年   37篇
  2018年   51篇
  2017年   67篇
  2016年   62篇
  2015年   29篇
  2014年   38篇
  2013年   213篇
  2012年   44篇
  2011年   62篇
  2010年   39篇
  2009年   40篇
  2008年   50篇
  2007年   51篇
  2006年   48篇
  2005年   52篇
  2004年   49篇
  2003年   56篇
  2002年   44篇
  2001年   63篇
  2000年   50篇
  1999年   48篇
  1998年   16篇
  1997年   14篇
  1996年   19篇
  1995年   12篇
  1994年   13篇
  1993年   12篇
  1992年   29篇
  1991年   32篇
  1990年   36篇
  1989年   39篇
  1988年   35篇
  1987年   25篇
  1986年   35篇
  1985年   26篇
  1984年   20篇
  1983年   16篇
  1982年   12篇
  1981年   18篇
  1980年   11篇
  1979年   19篇
  1978年   21篇
  1977年   16篇
  1971年   18篇
  1970年   17篇
  1969年   11篇
  1968年   17篇
  1967年   12篇
排序方式: 共有1878条查询结果,搜索用时 15 毫秒
121.
No reliable data are available on cases of lethal child abuse (by active force) in the area of the former German Democratic Republic. In a multicenter study we therefore examined the police and court records for such cases occurring in the period 1 January 1985 to 2 October 1990 in the entire area of the former German Democratic Republic. RESULTS: The study center received information on 39 cases of lethal child abuse which correspond to approximately 7 cases per year. However, a low percentage of undetected crimes which cannot be determined more precisely has to be taken into consideration. Almost 40% of the victims were younger than 1 year, 73% of the victims showed indications of repeated ill-treatment. The effects caused by using direct blunt forces, against the head in particular, were by far the most frequent causes of death. The male contact person (the victim's father, brother or stepfather as well as the life companion of the child's mother in particular) killed the child in most of the cases. As far as it is known, 37% of the male/female offenders suffered from chronic alcoholism; 32% of the male/female offenders were under the influence of alcohol when the crime happened. 83% of the male/female offenders who were found guilty made a confession shortly after the crime had happened or during the interrogations. Almost all the male/female offenders were sentenced to prison (the duration of the imprisonment varied between one year and for life). Due to the considerably lower section rate compared to the one in the German Democratic Republic, it is to fear that each second fatal child abuse is not detected in the new federal states.  相似文献   
122.
Prostate specific antigen (PSA, also known as p30), a glycoprotein produced by the prostatic gland and secreted into seminal plasma, is a marker used for demonstrating the presence of seminal fluid. Methods for the detection of PSA include Ouchterlony double diffusion, crossover electrophoresis, rocket immuno-electrophoresis, radial immunodiffusion, and ELISA. The extremely sensitive ELISA technique can detect PSA in concentrations as low as approximately 4 ng/mL. However, all these techniques are cumbersome and time consuming to perform in forensic laboratories, especially when only a few samples per week are processed. Various membrane tests are currently used in clinical settings to screen a patient's serum for the presence of PSA at levels greater than 4 ng/mL. In this study we evaluated three immunochromatographic PSA membrane tests by analyzing semen stains stored at room temperature for up to 30 years, post-coital vaginal swabs taken at different time after intercourse, semen-free vaginal swabs, and various female and male body fluids, including urine. The data demonstrate that PSA membrane test assays offer the same sensitivity as ELISA-based tests and provide a rapid approach for the forensic identification of seminal fluid. Furthermore, when the supernatant from a DNA extraction is used for the assay, there is essentially no DNA consumption for determining the presence of PSA in a forensic sample.  相似文献   
123.
Histological analysis of the viscera in experimental poisoning with psilocybin-containing mushrooms showed nonspecific changes in all examined organs, presenting as expressed hemocirculatory disorders and intracellular dystrophy. Quantitative histochemical analysis showed appreciable shifts in the activities of enzymes involved in the cytoplasmic and mitochondrial redox processes and of specific enzymes involved in nerve tissue metabolism. This may reflect some features in the direct effects of narcotic alkaloids contained in psilocybin-producing mushrooms.  相似文献   
124.
125.
126.
127.
128.
129.
130.
The recent establishment of fourth-tier system as a distinct, but coordinating level of government in Imo State came with the expectation that it would facilitate community development. However, the underdevelopment situation of most communities dashed this expectation. Thus, this recent study adopted theory of postcolonial state as our analytical framework to interrogate the development utility of the fourth-tier system using mixed research methods for evidence gathering and analysis. The analysis revealed that the system grossly underperformed its development functions resulting from lack of stakeholders’ supports, which should be the basis for determination and implementation of fourth-tier system in Imo State.  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