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   616篇
  免费   16篇
各国政治   30篇
工人农民   85篇
世界政治   49篇
外交国际关系   30篇
法律   256篇
中国政治   11篇
政治理论   167篇
综合类   4篇
  2021年   7篇
  2020年   5篇
  2019年   13篇
  2018年   15篇
  2017年   20篇
  2016年   28篇
  2015年   16篇
  2014年   12篇
  2013年   81篇
  2012年   12篇
  2011年   25篇
  2010年   17篇
  2009年   17篇
  2008年   18篇
  2007年   21篇
  2006年   15篇
  2005年   21篇
  2004年   29篇
  2003年   23篇
  2002年   27篇
  2001年   17篇
  2000年   13篇
  1999年   5篇
  1998年   16篇
  1997年   20篇
  1996年   3篇
  1995年   11篇
  1994年   4篇
  1992年   9篇
  1991年   6篇
  1990年   7篇
  1989年   8篇
  1988年   4篇
  1987年   9篇
  1986年   9篇
  1985年   6篇
  1984年   6篇
  1983年   3篇
  1982年   4篇
  1981年   8篇
  1980年   5篇
  1979年   2篇
  1978年   3篇
  1974年   2篇
  1973年   5篇
  1971年   2篇
  1970年   2篇
  1969年   5篇
  1968年   4篇
  1967年   2篇
排序方式: 共有632条查询结果,搜索用时 15 毫秒
31.
32.
33.
34.
35.
36.
37.
Wagner WE 《Duke law journal》2004,53(6):1619-1745
One of the most significant problems facing environmental law is the dearth of scientific information available to assess the impact of industrial activities on public health and the environment. After documenting the significant gaps in existing information, this Article argues that existing laws both exacerbate and perpetuate this problem. By failing to require actors to assess the potential harm from their activities, and by penalizing them with additional regulation when they do, existing laws fail to counteract actors' natural inclination to remain silent about the harms that they might be causing. Both theory and practice confirm that when the stakes are high, actors not only will resist producing potentially incriminating information but will invest in discrediting public research that suggests their activities are harmful. The Article concludes with specific recommendations about how these perverse incentives for ignorance can be reversed.  相似文献   
38.
The utility of pulmonary interstitial emphysema (PIE) in live birth determination is not well established. Because the distinction between live birth and stillbirth may be important in criminal proceedings, we undertook this study to investigate the relationship between the histologic finding of PIE and live birth. Sixty-six cases of infant death were retrieved and compared with 21 stillborn infants. Histologic sections of the lungs were characterized as "florid PIE," "equivocal PIE," or "absent PIE." Sixteen cases of florid PIE were identified, all in live born infants. Forty-seven cases of equivocal PIE were found in 36 live born and 11 stillborn infants. In 24 cases (14 live born infants and 10 stillborns), no PIE was identified. We examined the relationship between florid PIE in infants with sudden infant death syndrome (SIDS) or "sudden unexpected death in infancy, manner undetermined" (SUDI), and also its relationship to other variables. No association was found. The presence of equivocal PIE may be an artifact of tissue processing. Florid PIE is found only in live born infants. No correlation between the presence of florid PIE and cause of death could be determined.  相似文献   
39.
The neurologic manifestations of thallium poisoning include a severely painful ascending peripheral neuropathy, autonomic dysfunction, cranial nerve abnormalities, and a toxic encephalopathy. Although thallium has a short half-life, these neurologic manifestations commonly progress, even as the blood concentration of thallium decreases. This suggests either that thallium persists in neuronal tissues or that it initiates an injury cascade that takes time to fully manifest. As the latter mechanism is consistent with many toxin exposures, the concept of a central nervous system reservoir for thallium is often discounted. A recent case provided a unique opportunity to evaluate this possibility. A 48-year-old man was acutely and chronically thallium poisoned by his common-law wife. During his initial exposures, only gastrointestinal symptoms manifested. Following an acute ingestion, hospitalization was required. Over 3 days, his symptoms rapidly progressed from a severely painful neuropathy to slurred speech, ptosis, confusion, coma, respiratory insufficiency, and death. Because of considerations of alternative diagnoses, 2 lumbar punctures were performed, one on admission and another on the day of his death. Serum thallium concentrations obtained from stored blood samples were paired with spinal fluid concentrations from the same days. On day 1, serum and spinal fluid concentrations were 8700 mu/L and 1200 mu/L, respectively. On day 3, although the serum concentration had fallen to 7200 mu/L, the spinal fluid concentration had increased to 2100 mu/L. This case provides evidence to support the hypothesis that thallium distributes into the central nervous system more slowly than the blood compartment, and this may in part account for the progression of neurologic findings in the setting of decreasing serum concentrations.  相似文献   
40.
Investigating why people use the hospital emergency department (ED) for visits considered medically nonurgent can enhance our understanding of people's expectations of health care services, of their conceptions of prudent lay judgment, and of difficulties in negotiating the logistics of primary care services. This study identified reasons for such ED use from users' perspectives in both pediatric and adult visits. Respondents were asked to explain what brought them to the ED and to define an emergency. The study was conducted in two northeastern U.S. hospital EDs. The analysis drew on a convenience sample of 408 (331 pediatric, 77 adult users) face-to-face interviews that employed both open- and closed-ended questions. Findings indicate most patients had medical insurance and a regular place of care and most arrived by car or taxi. Twelve main themes emerged under three main categories: conceptions of needs, appropriateness, and preference for the ED. The findings indicate that various reasons for ED use may be construed as access issues. These include beliefs regarding limited availability of after-hour consultation services and of timely appointments at one's primary care site. Drawing on the findings, a typology that distinguishes between groups of users according to their preference for the ED, a level of congruence between their own reason and their definition of an emergency was developed. The typology suggests that people's concerns that influence their decision to come to the ED cannot be solved simply by expanding primary care services or by educational interventions. Its application yields recommendations for services and interventions.  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