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   10482篇
  免费   262篇
各国政治   670篇
工人农民   434篇
世界政治   743篇
外交国际关系   458篇
法律   5797篇
中国共产党   1篇
中国政治   55篇
政治理论   2496篇
综合类   90篇
  2020年   118篇
  2019年   135篇
  2018年   182篇
  2017年   211篇
  2016年   242篇
  2015年   160篇
  2014年   207篇
  2013年   1334篇
  2012年   213篇
  2011年   244篇
  2010年   236篇
  2009年   233篇
  2008年   272篇
  2007年   297篇
  2006年   282篇
  2005年   245篇
  2004年   240篇
  2003年   266篇
  2002年   284篇
  2001年   354篇
  2000年   308篇
  1999年   306篇
  1998年   158篇
  1997年   151篇
  1996年   127篇
  1995年   108篇
  1994年   110篇
  1993年   112篇
  1992年   171篇
  1991年   216篇
  1990年   194篇
  1989年   189篇
  1988年   191篇
  1987年   208篇
  1986年   214篇
  1985年   192篇
  1984年   157篇
  1983年   172篇
  1982年   121篇
  1981年   123篇
  1980年   95篇
  1979年   148篇
  1978年   107篇
  1977年   93篇
  1976年   79篇
  1975年   98篇
  1974年   113篇
  1973年   93篇
  1972年   68篇
  1971年   71篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
241.
242.
Interpreting a myocardial inflammation as causal, contributory or as of no significance at all in the cause of death can be challenging, especially in cases where other pathologic and/or medico-legal findings are also present. To further evaluate the significance of myocardial inflammation as a cause of death we performed a retrospective cohort study of forensic and clinical autopsy cases. We revised the spectrum of histological inflammatory parameters in the myocardium of 79 adult autopsy cases and related these to the reported cause of death. Myocardial slides were reviewed for the distribution and intensity of inflammatory cell infiltrations, the predominant inflammatory cell type, and the presence of inflammation-associated myocyte injury, fibrosis, edema and hemorrhage. Next, the cases were divided over three groups, based on the reported cause of death. Group 1 (n = 27) consisted of all individuals with an obvious unnatural cause of death. Group 2 (n = 29) included all individuals in which myocarditis was interpreted to be one out of more possible causes of death. Group 3 (n = 23) consisted of all individuals in which myocarditis was reported to be the only significant finding at autopsy, and no other cause of death was found. Systematic application of our histological parameters showed that only a diffuse increase of inflammatory cells could discriminate between an incidental presence of inflammation (Group 1) or a potentially significant one (Groups 2 and 3). No other histological parameter showed significant differences between the groups. Our results suggest that generally used histological parameters are often insufficient to differentiate an incidental myocarditis from a (potentially) significant one.  相似文献   
243.
Dental development can be used to estimate age for forensic purposes. However, most of the currently available methods are less reliable for the Indonesian population due to population variability. This study presents a new method and evaluates other methods that utilize dental development to estimate the age of Indonesian people. Panoramic radiographs of 304 young Indonesian people aged 5–23 years old were analysed for deciduous tooth root resorption, permanent tooth calcification, and eruption. The extent of tooth root resorption was determined based on AlQahtani’s modified Moorrees et al. method. Tooth calcification was classified based on a modified Demirjian et al. method. Tooth eruption was evaluated based on AlQahtani’s modified Bengston system. The sequence of tooth root resorption, and permanent tooth calcification and eruption were grouped into 19 age categories (from 5–23 years old) in an atlas. The differences between males and females, between maxillary and mandibular teeth, and between right and left teeth were also analysed. There were minimal significant differences of tooth development between males and females, and between the right and left teeth (P > 0.05), while the maxillary and mandibular dental development was significantly different (P < 0.05). The newly developed atlas showed the development of the right side of maxillary and mandibular tooth of combined sex of Indonesian population. Another 34 panoramic radiographs of known-age and sex individuals from Indonesia were assessed using the newly developed Atlas of Dental Development in the Indonesian Population, Ubelaker’s Dental Development Chart, The London Atlas of Human Tooth Development and Eruption by AlQahtani, and the Age Estimation Guide-Modern Australia population by Blenkin-Taylor. Accuracy was assessed by comparing estimated age to actual chronological age using the Bland-Altmand test. Results show that the smallest range of error was found in the Atlas of Dental Development in the Indonesian Population (−0.969 to 1.210 years), followed by The London Atlas of Human Tooth Development and Eruption by AlQahtani (−2.013 to 1.990 years), the Age Estimation Guide-Modern Australia population by Blenkin-Taylor (−2.495 to 2.598 years), and the Dental Development Chart by Ubelaker (−2.960 to 3.289 years). These findings show that the Atlas of Dental Development constructed in this study performs better than the other three methods and presents greater accuracy of age estimation in the Indonesian population.

Key points

  • Dental development such as deciduous tooth root resorption, permanent tooth calcification, and tooth eruption can be used to estimate age for forensic purposes.
  • The development of the teeth are influenced by genetic, ethnicity, and sex, therefore an age estimation method must be constructed based on the same population.
  • There were minimal significant differences in tooth development between male and female, and between right and left teeth, but there was significant difference between maxillary and mandibular teeth.
  • The Atlas of Dental Development in the Indonesian Population constructed in this study allowed more accurate age estimation of the Indonesian sample than the other methods tested.
Supplemental data for this article are available online at https://doi.org/10.1080/20961790.2021.1886648.  相似文献   
244.
245.
What determines whether countries' institutions attract or deter investment? Although existing theories predict that multinational enterprises (MNEs) avoid locations where institutions cannot constrain public and private actors' opportunistic behavior, we argue host institutions' attractiveness depends on firms' home environment. Home country institutions shape firms' practices and capabilities, thus helping to determine the environments that firms are best prepared to face abroad. We test our predictions using multiple data sets at different levels of analysis: firm‐level data on MNEs' foreign subsidiaries, data on bilateral foreign direct investment (FDI) positions, and longitudinal data on bilateral FDI flows. We find that states with independent judiciaries are particularly attractive to investment from countries also possessing independent courts. Similarly, countries with low judicial independence disproportionately send FDI to countries lacking independent judiciaries. These findings' implications challenge conventional wisdom: “Good” institutions may not attract all investors, and “bad” institutions may not always deter, as current research suggests.  相似文献   
246.
247.
248.
This paper models the effect of firm-level profitability (earnings before interest and taxes and return on sales) against certification by former members of the U.S. Congress. Although some scholars have studied certification, none have studied certification in the public policy market as is done in the current work. Likewise, although scholars have studied the effects of lobbying and political connections on firms' outcomes, none have studied lobbying through former Congress members specifically. The findings confirm that, after controlling for numerous factors, firms can use former Congress members to effectively lobby and certify their intentions. Both firm-level earnings before interest and taxes and return on sales were significantly associated with prior lobbying efforts by these former elected federal officials in several different estimation techniques employed in the study.  相似文献   
249.
Two separate frameworks have existed for the analysis of social predicaments in which businesses play a role: issues management and stakeholder management. In this paper, we argue that the chasm dividing these two literatures is artificial, and potentially obstructive to the advancement of our knowledge of the position of business in contemporary societies. The position we take in the present paper is that all social predicaments have an issues side as well as a stakeholder side and that a dual focus on both issues and stakeholders is therefore essential to understanding the evolution of these predicaments and crucial to managerial dealings with these issues. We present an integrative co-evolutionary framework, explaining the dynamics between issues and stakeholders in all consecutive stages of a predicament's evolution. The framework proposes a new way of thinking about issues and stakeholders, as such facilitates a deeper understanding of how the social environment of business is constituted, and offers new insights for the practical management of issues and stakeholders.  相似文献   
250.
In May 1935, the British manufacturer Boots launched ‘Number Seven’, a premium range of skin-care products sold via its nationwide network of chain-store chemists. Using material from the Boots Archive, this paper traces the early history of Number Seven to explore the changing meanings of middle-class cosmetics across the mid-twentieth century. Number Seven offered provincial and suburban women an explicitly modern form of facial beauty that married the logics of mass production to traditional moral aesthetics. Through the discourse of ‘loveliness’ and the careful management of in-store experience, it negotiated the prerogative connotations of colour cosmetics and the problematic influence of cinematic glamour. Yet by the mid-1950s, this construction had been superseded by a more situational understanding of beauty that was dependent on context and the appreciation of others. This fundamental shift in the normative aesthetics of public femininity had important implications for women on both sides of Boots’ toilet counters.  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