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   667篇
  免费   27篇
各国政治   38篇
工人农民   43篇
世界政治   76篇
外交国际关系   30篇
法律   410篇
中国政治   1篇
政治理论   96篇
  2023年   6篇
  2022年   5篇
  2021年   15篇
  2020年   18篇
  2019年   15篇
  2018年   31篇
  2017年   47篇
  2016年   42篇
  2015年   25篇
  2014年   29篇
  2013年   83篇
  2012年   31篇
  2011年   17篇
  2010年   14篇
  2009年   15篇
  2008年   25篇
  2007年   32篇
  2006年   25篇
  2005年   21篇
  2004年   29篇
  2003年   18篇
  2002年   27篇
  2001年   23篇
  2000年   10篇
  1999年   9篇
  1997年   3篇
  1996年   4篇
  1994年   1篇
  1993年   2篇
  1992年   4篇
  1991年   5篇
  1990年   6篇
  1989年   7篇
  1988年   4篇
  1987年   4篇
  1985年   1篇
  1984年   3篇
  1983年   3篇
  1981年   1篇
  1979年   3篇
  1978年   1篇
  1977年   1篇
  1975年   1篇
  1974年   1篇
  1973年   7篇
  1972年   5篇
  1971年   9篇
  1970年   1篇
  1966年   1篇
  1965年   1篇
排序方式: 共有694条查询结果,搜索用时 0 毫秒
41.
The use of the LightCycler for the detection of Y chromosome SNPs   总被引:3,自引:0,他引:3  
A novel methodology based on PCR monitoring on-line with fluorescent formats using the LightCycler for Y chromosome SNP typing is proposed. The main advantages of the system are the time necessary for the analysis (which is around 20 min), the robustness and the accuracy of the method and especially its sensitivity, which permits the detection of the male component in male-female mixtures up to 1:300 for some of the SNPs.Singleplexes of four different SNPs (M9, sY81, SRY-1532 and SRY-2627) as well as two duplexes (M9 and sY81 on the one hand and SRY-1532 and SRY-2627 on the other) were efficiently implemented. A simultaneous amplification and analysis of the four SNPs is also possible. It seems difficult with the current methodology to implement more than a quadruplex.  相似文献   
42.
The societal transformation underway in Poland createda fundamental challenge to the occupational health and safety system, as the ideological and administrative principles on which it was founded vanished along with the communist-dominated regime. This paper examines the regulatory reform in Poland during the 1990s: its structural elements, implementation record and future prospects. Drawing on five case studies of privatized firms, a mailed questionnaire, and policy and institutional analysis, we find that Poland had considerable success in developing an effective regulatory system for managing occupational health hazards in privatized sector while also achieving considerable socioeconomic progress. The fundamental legitimacy of the regulators and regulatory process, the availability of information about firms and regulatory intents, and the capacity for case-specific decision making, are among the key explanatory factors. The case-specific implementation in Poland is consistent with models advocated by several authors in relation to other industrialized European economies (termed variously as negotiated compliance, tit-for-tat, cooperation-deterrence), despite a uniquely Polish context related to the continuing legacy of the communist era. The study also shows how in Poland a good fit between regulatory institutions and policies on the one hand, and their social context on the other hand, contributes to the effectiveness of the regulatory system.  相似文献   
43.
Calculation of age from fetal and newborn remains may be problematic, and when these remains are altered by maceration, decomposition or burning, age may be more difficult to discern. When soft tissue indicators are transformed, then two techniques exist for accurate age determination; dental development, which may prove difficult given the degree of tissue alteration; and appearance, size and fusion of ossification centers, including diaphyseal length, which may yield inaccurate ages if shrinkage is not accounted for. This study is undertaken to facilitate age calculation by systematically re-evaluating diaphyseal shrinkage and determine shrinkage rates from wet to carbonized states and wet to calcined states using Petersohn and K?hler's data, originally published in German and then published in Fazekas and Kósa (1978:362-369). Average shrinkage, standard deviation, minimum and maximum values are calculated for each diaphysis and then for all diaphyses between 4-10 lunar months (LM) and for newborns. Associated values for carbonized diaphyses are: 4 LM--32.50% +/- 12.12%; 5 LM--14.04% +/- 4.44%; 6 LM--6.78% +/- 1.06%; 7 LM--4.18% +/- 0.31%; 8 LM--3.47% +/- 0.42%; 9 LM--3.05% +/- 0.18%; 10 LM--2.46% +/- 0.67%; and in newborns 2.16% +/- 0.29%. Similar values for calcined diaphyses are: 4 LM--40.11% +/- 17.51%; 5 LM--18.29% +/- 4.42%; 6 LM--9.84% +/- 1.27%; 7 LM--9.82% +/- 0.51%; 8 LM--9.42% +/- 0.72%; 9 LM--9.45% +/- 0.33%; 10 LM--8.94% +/- 0.37%; and in newborns 8.96% +/- 0.49%. These findings suggest that percent shrinkage due to carbonization and calcination is greatest in the earliest age groups, decreasing substantially with advancing age. The rates of shrinkage, however, vary by the burning process utilized and age group studied. These general findings are similar to those of Petersohn and K?hler, yet specific values for percent shrinkage vary greatly from values cited in this analysis. These data provide a means to assess the degree of shrinkage that occurs for each diaphysis for each given age group.  相似文献   
44.
Abstract

The aim of the study was to assess the relationship of compliance with anxiety, self-esteem, paranoid thinking, and anger. The Gudjonsson Compliance Scale (GCS), the State-Trait Anxiety Inventory (STAI), the Rosenberg Self-Esteem Scale, the Paranoia/Suspiciousness Questionnaire (PSQ), and the Novaco Anger Scale (NAS) were administered to 167 University students Compliance correlated positively with state and trait anxiety, low self-esteem, paranoia and suspiciousness, and negatively with acting out feelings of anger (the Behavioural Domain of the NAS). Multiple regression of the test scores showed that paranoid thinking was the single best predictor of compliance. The implications are discussed. It is important to replicate the study on special populations, such as offenders and psychiatric patients, who have problems with low self-esteem, paranoid thinking, and anger.  相似文献   
45.
46.
47.
48.
Journal of Youth and Adolescence - Previous research analyzing the differences in physical fitness and body composition between active and sedentary adolescents aged 12–16 has not provided...  相似文献   
49.
We analysed the Chilean university student selection processes, comparing ‘First Generation’ and ‘Continuist’ students, using the Chilean Higher Education population databases (2000–2015). Findings confirm that 60 percent of participants in the selection process are First Generation students. The data registers an increasing self-exclusion phenomenon. Of the students who did not take the selection test after enrolling, 80 percent are First Generation and 18 are enrolled in a selective university, compared to 44 in the Continuist conglomerate. These differences may be explained by cultural capital in the Bourdieu sense, in conjunction with a diversified, massified and marketalised higher education system.  相似文献   
50.
This article analyses how a gendered perspective on community-based tourism (CBT) contributes to the realisation of identity and sovereignty of quilombos. It examines the potential sustainability of CBT coupled with agro-ecological practices within the context of gendered identity politics. Drawing from in-depth ethnographic and archival research conducted between February and July 2015 at Campinho da Independência (Rio de Janeiro, Brazil), the article discusses how female leaders integrate sustainable agro-ecological practices and CBT with environmental education in what they call ‘ethno-ecological tourism’. This approach to CBT strengthens a proudly defiant version of Afro-Brazilian ethnic identity vis-à-vis the 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