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   224篇
  免费   2篇
各国政治   17篇
工人农民   1篇
世界政治   31篇
外交国际关系   10篇
法律   135篇
政治理论   28篇
综合类   4篇
  2024年   10篇
  2023年   37篇
  2022年   1篇
  2021年   13篇
  2020年   5篇
  2019年   9篇
  2018年   14篇
  2017年   5篇
  2016年   5篇
  2015年   3篇
  2014年   6篇
  2013年   29篇
  2012年   4篇
  2011年   6篇
  2010年   4篇
  2009年   6篇
  2008年   6篇
  2007年   4篇
  2006年   5篇
  2005年   3篇
  2004年   5篇
  2003年   6篇
  2002年   5篇
  2001年   2篇
  2000年   4篇
  1999年   1篇
  1998年   1篇
  1997年   2篇
  1996年   2篇
  1995年   2篇
  1993年   3篇
  1991年   1篇
  1989年   1篇
  1988年   1篇
  1987年   1篇
  1985年   1篇
  1983年   1篇
  1981年   1篇
  1980年   1篇
  1977年   2篇
  1973年   4篇
  1968年   2篇
  1967年   1篇
  1965年   1篇
排序方式: 共有226条查询结果,搜索用时 15 毫秒
211.
The Uncovered Set and the Limits of Legislative Action   总被引:1,自引:0,他引:1  
Ivan Jeliazkov Department of Economics, University of California, Irvine,Irvine, CA Itai Sened Department of Political Science, Washington University in St. Louis, St. Louis, MO We present a simulation technique for sorting out the size,shape, and location of the uncovered set to estimate the setof enactable outcomes in "real-world" social choice situations,such as the contemporary Congress. The uncovered set is a well-knownbut underexploited solution concept in the literature on spatialvoting games and collective choice mechanisms. We explain thissolution concept in nontechnical terms, submit some theoreticalobservations to improve our theoretical grasp of it, and providea simulation technique that makes it possible to estimate thisset and thus enable a series of tests of its empirical relevance.  相似文献   
212.
The present paper investigates the risk of lifetime suicide ideation associated with problem-solving ability and attitudes toward suicidal behavior in a sample of 328 university students (41% male, 59% female). The response rate was 77% based on the total number of students registered for the relevant courses. A series of questions assessed lifetime suicide ideation, while problem solving and attitudes toward suicide were measured using the Self-Rating Problem Solving scale and four subscales of the Suicide Opinion Questionnaire, respectively (McLeavey, 1986; Domino et al., 1989). Almost one-third of the students surveyed had lifetime suicide ideation. Both genders were similar in terms of their suicide ideation history, problem solving, and attitudes toward suicidal behavior with the exception that male students were more in agreement with the attitude that suicidal behavior lacks real intent. Compared with 2% of nonideators and ideators, one in four planners reported that they would more than likely attempt suicide at some point in their life. Greater agreement with the attitude that suicidal behavior is normal was associated with significantly increased risk of being an ideator, as was poor problem solving and less agreement with the attitude that suicidal behavior is associated with mental illness.  相似文献   
213.
214.
215.
216.
Fatal intoxications with opioids are known to be associated with an increased lung weight, as well as with brain and pulmonary edema and urinary retention. However, there is evidence to suggest that fatal intoxications with non-opioid substances are also associated with increased lung weight; however, the latter aspect has not been comprehensively analyzed. To determine to what extent opioid and non-opioid substances are associated with increased lung and brain weight, we studied these organs in cases where the cause of death was attributed to intoxication with a single agent. Using data from cases autopsied at the National Board of Forensic Medicine (NBFM) in Sweden from 2009 through 2019 where the cause of death was attributed to a single substance, we created models of combined lung weight and brain weight. The models used age and sex as predictors as well as nested varying effects for the specific intoxicant and category of intoxicant. Suicidal hanging with negative toxicology cases served as controls. The population majority was male among both intoxications (68%) and controls (83%). The most common single substance group was opioids. All tested substances were associated with heavier lungs than controls, with the largest effect in the opioid group. Our findings show that several substances are associated with increased lung weight and that among intoxication deaths there is no difference in expected brain weight between substances. Hence, heavy lungs, without a reasonable explanation, should prompt a broad toxicological screening.  相似文献   
217.
Nitrites are commonly used in the chemical, pharmaceutical, and food industries. Recently, they have been identified in cases of voluntary intoxication. We report the case of a 13-year-old girl who was found lifeless on her bed next to a glass containing a white powder and a bottle containing a white powder with a moistened appearance. External examination and autopsy revealed a nonspecific asphyxia syndrome, which was confirmed by the pathological analysis. Analysis of the samples revealed metoclopramide in the peripheral blood at a concentration of 0.402 mg/L (LC–HRMS). An analysis of the gastric contents was carried out after sodium nitrite was detected in the powders found near the body (Raman spectrometry). Nitrites were found in the gastric fluid at a concentration of 30.9 mg/L. Death occurred secondary to anoxia, following ingestion of nitrites; suicide kits are available on the web and nitrites are relatively easy to source and inexpensive. Nitrites are delivered in powder form to be dissolved in liquid, which may then be consumed with metoclopramide (or an alternative anti-emetic drug) to maximize absorption and reduce emesis. The toxic effect of nitrites lies in their oxidizing power, causing the transformation of hemoglobin into methemoglobin, which, when it accumulates, induces tissue anoxia resulting in death. There has been an alarming increase in the number of cases linked to suicide using nitrites or a nitrite suicide kit. The fact that nitrites are readily available online underscores the importance of establishing effective preventive measures such as limiting the access and use of this chemical.  相似文献   
218.
Subnuclear vacuoles in the proximal renal tubules have been reported as a histologic sign of ketoacidosis. Originally described in diabetic ketoacidosis, renal vacuoles can be found in other ketogenic states such as alcoholic ketoacidosis (AKA), starvation, and hypothermia, underpinned by deranged fatty acid metabolism. A retrospective analysis of 133 deaths associated with alcohol use disorder (AUD) examined at autopsy between 2017 and 2020 was undertaken. This study aimed to determine the prevalence of subnuclear vacuoles in deaths of those with AUD and their specificity for deaths from AKA, and to elucidate what demographic, biochemical, and pathologic findings are associated with subnuclear vacuoles. In each case, vitreous humor biochemistry including electrolytes, glucose, and beta-hydroxybutyrate (BHB) was analyzed alongside postmortem hemoglobin A1c and renal and liver histology. Renal histology was graded for the presence of vacuoles as absent (0), scanty (1), or easily identifiable (2). Liver histology was graded for steatosis and for fibrosis if Masson trichrome staining was available. Vacuoles were commonly seen in the deaths of those with AUD. They were seen in deaths due to AKA but were not specific to that cause of death. With vacuoles present, lower vitreous sodium (139 vs. 142 mmol/L; p = 0.005), higher vitreous BHB (1.50 vs. 1.39 mmol/L; p = 0.04), severe hepatic steatosis, and severe hepatic fibrosis were seen, compared with those without renal vacuoles.  相似文献   
219.
This study aims to identify the macroscopic and microscopic changes that occur in the heart in different causes of cardiovascular death and sudden cardiac death in autopsy cases and evaluate the difficulties that a forensic practitioner may encounter during autopsies. All forensic autopsy cases in the Morgue Department of the Council of Forensic Medicine, Antalya Group Administration between January 1, 2015, and December 31, 2019, were examined, retrospectively. The cases were chosen according to inclusion and exclusion criteria, and their autopsy reports were examined in detail. It was determined that 1045 cases met the study criteria, 735 of which were also met the sudden cardiac death criteria. The top three common causes of death were ischemic heart disease (n = 719, 68.8%), left ventricular hypertrophy (n = 105, 10%), and aortic dissection (n = 58, 5.5%). The frequency of myocardial interstitial fibrosis was significantly higher in deaths due to left ventricular hypertrophy than in deaths due to ischemic heart disease and other causes (χ2(2) = 33.365, p < 0.001). Despite detailed autopsy and histopathological examinations, some heart diseases that cause sudden death may still not be detected.  相似文献   
220.
The service sector increasingly has become the cornerstone of a great number of economies in both the developed and developing world. The main barrier to trade in services is the imposition of domestic regulations which are aimed at ensuring the affordability, availability and efficiency of services. Such domestic regulations are important for services and the General Agreement on Trade in Services (GATS) consequently recognises the right of countries to regulate in order to achieve these goals. The GATS, however, also seeks to discipline such regulations to ensure that they do not hinder trade in services. This article seeks to assess these seemingly competing interests in the context of South Africa's history and its burgeoning telecommunications sector.  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