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   17643篇
  免费   1471篇
  国内免费   296篇
  19410篇
  2024年   152篇
  2023年   264篇
  2022年   240篇
  2021年   283篇
  2020年   557篇
  2019年   595篇
  2018年   553篇
  2017年   669篇
  2016年   676篇
  2015年   428篇
  2014年   568篇
  2013年   1794篇
  2012年   438篇
  2011年   439篇
  2010年   370篇
  2009年   567篇
  2008年   738篇
  2007年   778篇
  2006年   741篇
  2005年   630篇
  2004年   545篇
  2003年   447篇
  2002年   422篇
  2001年   262篇
  2000年   249篇
  1999年   214篇
  1998年   171篇
  1997年   142篇
  1996年   121篇
  1995年   108篇
  1994年   98篇
  1993年   81篇
  1992年   62篇
  1991年   45篇
  1990年   49篇
  1988年   39篇
  1987年   26篇
  1985年   368篇
  1984年   416篇
  1983年   344篇
  1982年   449篇
  1981年   441篇
  1980年   442篇
  1979年   394篇
  1978年   444篇
  1977年   350篇
  1976年   354篇
  1975年   272篇
  1974年   278篇
  1973年   236篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
Some aspect of psychosocial criteria is commonly utilized by most transplant programs in assessing candidates' acceptability for transplantation. However, regardless of the assessment methodology, information obtained in pretransplant assessments may be limited given the evaluative nature of the assessment as well as the sensitive nature of the contents. Indeed, transplant candidates may present themselves in a favorable fashion, minimizing any negative traits or psychological dysfunction which they perceive might prevent transplantation. Unfortunately, there are limited data addressing the extent to which transplant candidates may present themselves in an overly positive light. This investigation surveys the prevalence of social desirability in lung transplant candidates as well as its association with self-reports of perceived stress. Further, the relationship between social desirability and interviewer ratings of transplant candidacy is examined. Subjects included 24 patients in end-stage organ failure being evaluated for lung transplant candidacy. Subjects completed the Perceived Stress Scale and a brief version of the Marlowe-Crowne Social Desirability Scale. Additionally, subjects were interviewer-rated on the Psychosocial Assessment of Candidates for Transplantation. Results indicate social desirability is a prevalent phenomenon in lung transplant candidates, with more than half of the sample scoring at or above the 84th percentile on the social desirability measure. Further, self-reports of perceived stress are moderately and inversely associated with social desirability (r=–.55,p .01). Social desirability was unrelated to interviewer-ratings of transplant candidates acceptability (r=.13,p .56). Future research might include larger samples of subjects, other organ transplant candidates, and more detailed assessments of symptom distress.  相似文献   
112.
This paper examines Freud's evolving network of enterprise from 1876 to 1900 and the ensemble of metaphors which he used in the development of his theory (1888–1900). It will be shown that, in spite of Freud's obligatory change of career at age 26, there is no sharp break between Freud's early scientific work and his psychological research. Many signs of continuity between the two periods can be found. Freud's journey of scientific self-discovery only progressively led him to the frontiers of the unknown and his ultimate challenge: exploring the secrets of sexuality. Freud's avowed commitment to the study of the unconscious may have happened as late as 1899 as his metaphors celebrate an intimate fusion between the creator and his creation.  相似文献   
113.
We tested the notion that better foster care adjustment would be observed when the temperaments of mothers and fathers were matched with those of adolescent foster children. We hypothesized that families in which foster parents and foster children had high (easy) scores on subscales of the Revised Dimensions of Temperament Scale (DOTS-R) would also report higher family functioning and higher foster care adjustment than parents and children from families in which one or both family members had low (difficult) scores on these scales. The hypotheses were supported when the mothers and fathers family assessments were used but rejected when the observations of the case managers and adolescents were tested. Methodological and substantive explanations for the findings are discussed and recommendation for foster care practice and continuing research are provided.  相似文献   
114.
In this paper I formulate an approach for evaluating probabilistic forecasts in terms of signal detection theory. Signal detection theory provides a powerful perspective for this type of problem, and a rich empirical background including methodological tools as well as an extensive body of research in many domains. I propose procedures which emphasize the maximization of expected utility for the decision maker who uses the forecasts. Further, I suggest approaches to obtaining indices of calibration and resolution within this framework. I also present arguments that the proposed indices will exhibit the same basic properties as do decompositions of Brier's (1950, Monthly Weather Review, 78, 1–3) mean probability score. However, the properties may be reflected in different ways, and hence, the present methods may lead to different conclusions about forecasting ability. Finally, I argue that the use of an expected utility loss function makes this approach more appropriate for practical applications as well as for theoretical research than other procedures with more arbitrary loss functions.  相似文献   
115.
The present study, employing a 2 × 2 true-experimental design and regression analyses assessed the main and interactive effects of feedback consistency (consistent vs inconsistent), and feedback favorability (acceptable vs superior), for feedback given at two time periods on measures of perceived feedback accuracy and self-perceived task competence. Among the study's findings were that (a) the perceived accuracy of feedback at the second period was a function of the favorability of feedback received at the first time period, (b) the self-perceived task competence levels of subjects were jointly determined by the favorability of feedback received at both time periods, and (c) the perceived accuracy of feedback was a function of its consistency. Organizational implications of the study's results are offered.  相似文献   
116.
117.
Expectancy theory concepts were used to predict (a) the attractiveness of, (b) the amount of effort directed toward entering, and (c) the eventual choice of a job in relatively big and small work organizations. It was found, among a group of graduating seniors from a technical college, that antecedent perceptions regarding organizational size (expectancy, valence, instrumentality) were significantly related to the relative attractiveness of different-sized organizations and the number of job interviews taken with relatively big and small companies. In addition, economically tied extrinsic outcomes were seen as more readily attainable in big organizations, whereas certain intrinsic outcomes were perceived to be more easily obtained in small organizations.  相似文献   
118.
A report on the process and procedures of determining generic occupational skills and clusters of occupations for optimal occupational training needs is presented. Four hundred and ninety workers and their supervisors representing 37 different occupations were interviewed using a structured questionnaire consisting of items on mathematics, communication, reasoning, and interpersonal and manipulative skills. Respondents were asked to indicate whether a specific skill was a prerequisite to enter a job and also whether that specific skill was required on the job. Six, three, and two hierarchical skill factors and nine occupational clusters were identified. Training and curricular implications were explored.  相似文献   
119.
This study sought (1) to compare the relative predictive powers of job attachment and job satisfaction with respect to turnover among a sample of public employees; and (2) to examine individual and job-related influences on both attitudes. It was found that attachment was a more effective predictor of turnover than overall satisfaction (or any facet of satisfaction), even when the alternative attitude was partialled out. In addition, it was found that individual employee characteristics were more strongly related to attachment than were job characteristics, while the opposite was found for satisfaction. The findings are discussed in the light of previous evidence, and implications are drawn for research in vocational behavior.  相似文献   
120.
A causal model for career choice was outlined, encompassing psychological cost-benefit-profit as a central intervening construct. The model was applied to the career choice (education vs work) after high school graduation and tested on longitudinal data from 173 students. The main problem concerned the relationship among the components in the causal career choice model, using multiple correlation and path analysis as tools. The results showed clear sex differences. For boys, the model was a rather powerful predictor of career choice (R = 0.70), and Psychological profit with regard to continued education had a clear direct effect as well as an indirect effect on career choice. For girls, the predictive validity was low (R = 0.35) and Psychological profit affected career choice only indirectly via Educational aspiration.  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