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   1501篇
  免费   66篇
  国内免费   7篇
  2023年   19篇
  2022年   16篇
  2021年   25篇
  2020年   29篇
  2019年   24篇
  2018年   63篇
  2017年   47篇
  2016年   61篇
  2015年   31篇
  2014年   38篇
  2013年   134篇
  2012年   54篇
  2011年   43篇
  2010年   39篇
  2009年   27篇
  2008年   52篇
  2007年   57篇
  2006年   37篇
  2005年   33篇
  2004年   36篇
  2003年   25篇
  2002年   31篇
  2001年   38篇
  2000年   61篇
  1999年   25篇
  1998年   16篇
  1997年   13篇
  1996年   9篇
  1992年   21篇
  1991年   15篇
  1990年   35篇
  1989年   26篇
  1988年   15篇
  1987年   25篇
  1986年   33篇
  1985年   21篇
  1984年   25篇
  1983年   17篇
  1981年   12篇
  1980年   9篇
  1979年   15篇
  1978年   11篇
  1975年   15篇
  1974年   15篇
  1973年   22篇
  1972年   15篇
  1971年   17篇
  1970年   15篇
  1968年   9篇
  1967年   10篇
排序方式: 共有1574条查询结果,搜索用时 15 毫秒
61.
The etiology, pathogenesis, and clinical treatment of stenoses of the isthmus aortae are outlined. Following this, the particular case of a 41-year-old patient with typical stenosis of the isthmus of the aorta is reported. The course of disease required the need for a surgical operation, which had not initially been taken into consideration, to be reexamined. The patient, after performance on him of vascular restoration, is now on a part-time job. Using age as the sole circumstance indicating the inadvisability of performing a surgical operation in the case of stenosis of the isthmus aortae cannot any longer be considered justifiable.  相似文献   
62.
63.
64.
Why do we adopt new rules, such as social distancing? Although human sciences research stresses the key role of social influence in behaviour change, most COVID-19 campaigns emphasize the disease’s medical threat. In a global data set (n = 6,675), we investigated how social influences predict people’s adherence to distancing rules during the pandemic. Bayesian regression analyses controlling for stringency of local measures showed that people distanced most when they thought their close social circle did. Such social influence mattered more than people thinking distancing was the right thing to do. People’s adherence also aligned with their fellow citizens, but only if they felt deeply bonded with their country. Self-vulnerability to the disease predicted distancing more for people with larger social circles. Collective efficacy and collectivism also significantly predicted distancing. To achieve behavioural change during crises, policymakers must emphasize shared values and harness the social influence of close friends and family.  相似文献   
65.
66.
Research on Child and Adolescent Psychopathology - This study examined bidirectional links between teachers’ disciplinary practices (punitive and educational), students’ peer status in...  相似文献   
67.
Cognitive Processing - The issue of tool adoption has been the subject of many investigations, which focus either on acceptability (evaluating intention to use, a priori) or acceptance (evaluating...  相似文献   
68.
69.

In 1950s, the concept of brain death, which began to be discussed primarily in terms of medicine and then in terms of religion, law, and ethics, became a central topic in all world countries as it was an early diagnosis of death. Despite the fact that brain death (BD) diagnosis is of importance for benefitting from organ and tissue transplantation of patients in the world, the literature still involves no bibliometric studies that made a holistic evaluation of the publications about this issue. The present study aims to investigate the top-cited articles about BD published between 1980 and 2018, identify the citation collaboration of the journals, demonstrate the collaboration between the countries, define the relationship between organ transplantation and BD, and reveal the latest developments and trend topics about this issue. In addition, this study aims to investigate the relationship between religions of countries and brain death publication productivity. Documents for bibliometric analysis were downloaded from Web of Science. The literature search was performed using the keywords “brain death/dead” during 1980–2018. The correlations between gross domestic product (GDP), Human Development Index (HDI) and publication productivity of the countries on BD were investigated with Spearman’s correlation coefficient. There was a high-level, statistically significant correlation between the number of publications and GDP, and HDI and the number of publications about BD (r = 0.761, p < 0.001; r = 0.703, p < 0.001). The USA was the top country in terms of publication productivity, which was followed by developed countries such as Germany, Japan, France, and Spain. However, the contribution of the undeveloped or developing countries such as China, Brazil, Turkey, Iran, and South Africa was found to be considerably important. While many people in the world die with undamaged organs, many other people die needing those organs. Therefore, it is considered that the collaborations and thus multidisciplinary studies about BD should be increased in the world countries, and the countries should be involved in bigger collaborations instead of little clusters. Especially, Muslim countries should be encouraged to do research and publish studies about the issues of brain death and organ transplantation.

  相似文献   
70.
In the present study, we examined the impact of the interaction of environmental and task-induced attentional focus on time perception, specifically awareness of the time flow. We tested 48 participants in either a natural or urban setting over three 25- to 35-min sessions. We manipulated the within-subjects factor task by means of two tasks—one requiring directed attention on the task itself, the other undirected attention on the environment—alongside a control condition with no specific task. We measured time awareness, passage of time judgments, felt time judgments, and estimated time as dependent variables. For time awareness, we found an interaction between environment and task: in the natural environment, only a task requiring directed attention reduced time awareness; whereas, in the urban environment, both tasks reduced time awareness compared to the control condition. The results suggest that natural environments increase time awareness unless we focus our attention on a task.  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