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   1007篇
  免费   29篇
  1036篇
  2022年   8篇
  2021年   8篇
  2020年   12篇
  2019年   16篇
  2018年   17篇
  2017年   22篇
  2016年   25篇
  2015年   11篇
  2014年   24篇
  2013年   102篇
  2012年   41篇
  2011年   36篇
  2010年   19篇
  2009年   29篇
  2008年   40篇
  2007年   38篇
  2006年   39篇
  2005年   37篇
  2004年   25篇
  2003年   18篇
  2002年   33篇
  2001年   15篇
  2000年   8篇
  1999年   23篇
  1998年   17篇
  1997年   21篇
  1996年   12篇
  1995年   19篇
  1994年   19篇
  1993年   17篇
  1992年   14篇
  1991年   24篇
  1990年   17篇
  1989年   14篇
  1988年   10篇
  1987年   14篇
  1986年   16篇
  1985年   11篇
  1984年   14篇
  1983年   13篇
  1982年   16篇
  1981年   13篇
  1980年   11篇
  1979年   15篇
  1978年   10篇
  1977年   13篇
  1976年   11篇
  1975年   8篇
  1974年   7篇
  1973年   6篇
排序方式: 共有1036条查询结果,搜索用时 0 毫秒
941.
The federal regulations of human research were written to permit the use of discretion so that research can fit the circumstances under which it is conducted. For example, the researcher and institutional review board (IRB) could waive or alter some informed consent elements if they deem this the morally and scientifically best way to conduct the research. To do so, however, researchers and IRBs would first have to use mature moral and scientific judgment. They might also have to rely on empirical research to discover the most effective way to act on their moral sense (e.g., to discover how best to approach potential research participants and explain the nature and purpose of the research participation for which they are being recruited, to ensure comprehension and competent decision making). On discovering the most ethical way to proceed, they would then need to look to the federal regulations of human research to discover how to document their decision and justify it within that somewhat flexible regulatory structure. Unfortunately, many IRBs and researchers fail to take these sensible steps to solve ethical problems and proceed immediately to a default requirement of the regulations that places science at odds with the regulations and, ostensibly, with ethics. The following articles in this special issue are about the process of learning to engage in ethical problem solving and using the flexibility permitted by the federal regulations. These articles extricate researchers from the mindset that has gotten them into trouble, and, ideally, provoke them to use mature common sense and moral judgment.  相似文献   
942.
A Hybrid Abductive Inductive Proof Procedure   总被引:1,自引:0,他引:1  
  相似文献   
943.
Two small-sample tests (proposed by Tate and Clelland and by Chapanis respectively) of hypotheses about the parameters of the multinomial distribution, where
$$f(x|p) = n!\prod\limits_{i = 1}^k {\frac{{p_i^{x_i } }}{{x_i !}}} $$  相似文献   
944.
To investigate the relationships among the nursing home work environment, emotional strain, and depression in Nursing Assistants in Ohio and West Virginia, this cross-sectional study was conducted with 395 Nurse Assistants in 49 nursing homes in Ohio and West Virginia. Organizational attributes were measured independently at the individual and organizational levels. Multilevel modeling techniques were used to analyze the data. Our methods examined nursing home organizational structure (ownership type, managerial style), and work organization (emotional strain) was examined in relation to the prevalence of depression among nursing assistants. Our findings suggest workplace emotional strain and age are associated with increased odds of depression. Implications of our work include that work in nursing homes for the environment it fosters has a strong effect on emotional strain and depression among Nursing Assistants.  相似文献   
945.
This study was conducted to estimate the relationship between academic dishonesty and religiosity in a convenient sample of college students. Scores on the Santa Clara Strength of Religious Faith Questionnaire and the Academic Practices Survey were correlated for 70 undergraduate students. Overall, religiosity and academic dishonesty were not significantly related. However, follow-up analyses by sex indicated that this association was significant for women but not men. Research should be conducted to investigate whether this pattern is robust and indicates a differing role for religiosity as a standard for appropriate or inappropriate behavior.  相似文献   
946.
Most models of craving propose that when cravings are strong, diverse responses--thought to index an underlying craving state--covary. Previous studies provided weak support for this hypothesis. The authors tested whether nicotine deprivation affects degree of covariation across multiple measures related to craving. Heavy and light smokers (N = 127) were exposed to smoking cues while either nicotine deprived or nondeprived. Measures included urge ratings, affective valence, a behavioral choice task assessing perceived reinforcement value of smoking, and smoking-related judgment tasks. Results indicated higher correlations in the nicotine-deprived than in nondeprived group. The measures principally responsible for this effect loaded onto a single common Craving factor for nicotine-deprived but not nondeprived smokers. These findings suggest that, under certain conditions, measures of craving-related processes covary.  相似文献   
947.
90 Grade 4 children from upstate New York completed a "what I usually do" questionnaire, reporting on their after-school activities. Contrary to the concerns of some psychologists, there was no evidence that the children were being "hurried" out of childhood or "hot-housed" to develop academic or other excellence. The children's time was largely spent in enjoyable, self-chosen, and nonacademic activities, most often play or television viewing.  相似文献   
948.
Previous research has shown a tendency for people to imagine simple sentences as evolving from left to right, with the sentence subject being located to the left of the object. In two cross-cultural studies comparing Italian and Arab participants, we investigated whether this bias is a function of hemispheric specialization or of directionality of written language (left to right in Italian, right to left in Arabic). Both studies found a reversal of directional bias in Arabs. Italians tended to position the subject to the left of the object, and Arabs tended to position the subject to the right of the object (Experiment 1); both groups were facilitated in a sentence-picture matching task when the subject was drawn in the position that it would usually occupy in the written language (left for Italians, right for Arabs; Experiment 2). In Experiment 2, an additional, language-independent facilitation was observed when action evolved from left to right, suggesting that both hemispheric specialization and scanning habit affect visual imaging.  相似文献   
949.
Abstract - We examined whether a pictorial depth illusion influences the manual pursuit of a moving dot to the same extent that it influences the dot's apparent displacement. Fourteen subjects performed two tasks. In one case, they used their unseen hand to track a dot that moved on an elliptical path. In the other, they first watched the dot move on the same path, and then set an ellipse to match the shape of the dot's path. The illusion influenced the two tasks to the same extent, suggesting that the visual information processing is the same for the two tasks.  相似文献   
950.
This research aimed to chart the trajectories of functional status in old age in Japan and to assess how self-rated health and cognitive functioning differentiate these trajectories and account for interpersonal differences. Data came from a 5-wave panel study of a national sample of 2,200 Japanese older adults between 1987 and 1999. The sample as a whole showed an accelerated increase in functional limitations with age. approximated by a quadratic function. More important, 3 major trajectories of functional change were identified: (a) minimal functional decrement, (b) early onset of functional impairment. and (c) late onset of functional impairment. These findings may serve as useful benchmarks for observations derived from other developed nations.  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