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   953篇
  免费   57篇
各国政治   86篇
工人农民   71篇
世界政治   100篇
外交国际关系   65篇
法律   442篇
中国共产党   2篇
中国政治   12篇
政治理论   226篇
综合类   6篇
  2023年   15篇
  2022年   11篇
  2021年   11篇
  2020年   31篇
  2019年   39篇
  2018年   59篇
  2017年   53篇
  2016年   51篇
  2015年   34篇
  2014年   33篇
  2013年   148篇
  2012年   47篇
  2011年   36篇
  2010年   44篇
  2009年   37篇
  2008年   22篇
  2007年   38篇
  2006年   37篇
  2005年   42篇
  2004年   23篇
  2003年   31篇
  2002年   21篇
  2001年   15篇
  2000年   10篇
  1999年   4篇
  1998年   4篇
  1997年   8篇
  1996年   11篇
  1995年   4篇
  1994年   7篇
  1993年   11篇
  1992年   5篇
  1991年   2篇
  1990年   9篇
  1989年   3篇
  1988年   4篇
  1987年   8篇
  1986年   3篇
  1985年   4篇
  1984年   6篇
  1983年   7篇
  1982年   5篇
  1981年   4篇
  1980年   2篇
  1979年   3篇
  1978年   1篇
  1977年   1篇
  1976年   2篇
  1975年   2篇
  1965年   2篇
排序方式: 共有1010条查询结果,搜索用时 31 毫秒
41.
The new institutionalist approach is heavily committed to the idea that institutions matter. This article explores this commitment by examining the institutions of corporatism using comparative data in order to relate these to those of Konkordanzdemokratie. A neo-institutionalist perspective may be employed to illustrate how the institutions of Konkordanzdemokratie and macrocorporatism are related, both in terms of their origins as well as their policy outputs and outcomes. This article shows that both the conditions and the configuration of outputs and outcomes of Konkordanzdemokratie and corporatism are different. Therefore, one should clearly distinguish between these two sets of institutions. In a cross-sectional approach the configuration of socio-economic outcomes connected with these institutions are not as impressive as often claimed.  相似文献   
42.
43.
The purpose of the present investigation was to test the accuracy of a new scoring system in recording tooth wear for age estimation. The material consisted of dental stone casts of 383 volunteers who had sound premolars and molars with normal occlusion. The degree of occlusal wear for all premolar and molar teeth was scored with the new system. The high intra- and inter-examiner concordances showed that the new score system was very reliable. The degree of tooth wear showed a significant positive correlation with age in each and every examined tooth of both males and females. Tooth wear scores of males were higher than those of females. Calculating tables for age estimation were designed and the accuracy of age estimation was obtained with the General Linear Models procedures. Our system could provide estimation of an individual's age within +/-3 years in 42.4% of males and 49.4% of females, within +/-5 years in 61.8% of males and 63.3% of females. When the subjects were divided into two age groups and data were re-treated, the accuracy of age estimation was increased. Collectively, it was shown that our new system for scoring tooth wear is a reliable and accurate method for age estimation.  相似文献   
44.
An accurate and simple method was developed to determine the level of toluene in urine and blood quantitatively by using the gas chromatography/mass spectrometry (GC/MS) with headspace--solid phase microextraction (HS-SPME) technique. An assembly of SPME with a replaceable extraction fiber, coated with 100 microm polydimethylsiloxane, was used. The detection limit of toluene in blood and urine with HS-SPME technique was 10 times higher than that with headspace (HS) technique. To compare the HS-SPME with HS technique for the determination of toluene in biological fluids, blood and urine samples from glue sniffers were analyzed by both methods. The level of toluene by the two techniques was highly correlated: the correlation coefficient (r2) between the two sets of values were 0.98 and 0.96 in urine and blood, respectively.  相似文献   
45.
46.
47.
Asphyxia, not an uncommon cause of sudden death, may result from numerous etiologies. Foreign-body aspiration and strangulation are 2 extrinsic causes. Airway obstruction may also be caused by laryngeal edema, asthma, infection, or anaphylaxis. Chronic causes of asphyxia include musculoskeletal diseases (eg, muscular dystrophy, amyotrophic lateral sclerosis), neurologic disorders (eg, myasthenia gravis, multiple sclerosis), respiratory disease (eg, emphysema, chronic bronchitis), or tumors. The manner of death in cases of asphyxiation may be natural, accidental, homicide, or suicide. For the death investigator, determining the cause and manner of death can often be quite challenging.We report here 2 cases of an esophageal fibrovascular polyp causing sudden asphyxial death, review of the literature, and discussion of other differential diagnoses in the case of asphyxial death.  相似文献   
48.
Hypertrophic cardiomyopathy (HCM) is a disease process which results in a large, heavy heart, with hypertrophy of the interventricular septum (IVS) and left ventricle. HCM accounts for a significant number of cases of sudden cardiac death each year, most infamously in young athletes. The prevalence of the disease has increased over the past several years due to advances in clinical diagnosis and molecular genetic studies. Over this same period, new forms of treatment also have emerged. One such treatment is alcohol septal ablation (ASA). ASA is a procedure performed by a cardiologist, via cardiac catheterization, by injecting pure ethanol into selected arteries which supply the IVS, resulting in a targeted myocardial infarction. This infarct then retracts and forms a scar, decreasing the outflow obstruction and improving the patient's clinical symptoms.The authors report 2 cases of death following ASA treatment of HCM. The first, a 56-year-old male, had his ASA procedure 10 days prior to death. The second decedent, a 76-year-old female, had her procedure only 30 hours before death. These case reports are followed by a discussion about HCM, including pathology, treatments, and treatment-related pathology, before closing with a discussion about death certification in the cases presented and therapy-related deaths in general.  相似文献   
49.
This study was designed to compare the qualitative results and concentrations of methamphetamine (MA) and its metabolite amphetamine (AP) in head hair and hair collected from different parts of the body (axillae and pubis). Hair from subjects (N = 14) suspected MA users was simultaneously collected. Hair preparation involved washing step, fine cutting, overnight extraction, derivatization by the trifluoroacetic anhydride, and gas chromatography/mass spectrometry (GC/MS) using selective ion monitoring. In this study, we found a good correlation of the qualitative results for MA between head hair and hair on other parts of the body, but there were some differences in concentrations of MA and AP. Namely, the concentrations of MA and AP were higher in axillary and pubic hair than in head hair.  相似文献   
50.
In this study, 12 Y-specific STR loci--DYS391, DYS389 I, DYS439, DYS389 II, DYS438, DYS437, DYS19, DYS392, DYS393, DYS390, DYS385a/b--were analyzed in 259 unrelated males from the southern populations in Korea using the PowerPlex Y PCR system.  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