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   2383篇
  免费   218篇
  国内免费   125篇
  2024年   12篇
  2023年   64篇
  2022年   36篇
  2021年   80篇
  2020年   137篇
  2019年   140篇
  2018年   128篇
  2017年   129篇
  2016年   120篇
  2015年   85篇
  2014年   125篇
  2013年   297篇
  2012年   56篇
  2011年   77篇
  2010年   71篇
  2009年   81篇
  2008年   90篇
  2007年   118篇
  2006年   104篇
  2005年   98篇
  2004年   81篇
  2003年   99篇
  2002年   82篇
  2001年   82篇
  2000年   46篇
  1999年   45篇
  1998年   27篇
  1997年   41篇
  1996年   21篇
  1995年   31篇
  1994年   16篇
  1993年   27篇
  1992年   10篇
  1991年   8篇
  1990年   6篇
  1989年   4篇
  1988年   2篇
  1987年   5篇
  1986年   1篇
  1985年   3篇
  1984年   5篇
  1983年   1篇
  1982年   3篇
  1981年   5篇
  1980年   6篇
  1979年   5篇
  1978年   4篇
  1977年   6篇
  1975年   4篇
  1974年   2篇
排序方式: 共有2726条查询结果,搜索用时 15 毫秒
21.
This paper addresses some critical issues in the applicability of quantitative performance measures (including bibliometric, economic, and co-occurrence measures) to the assessment of basic research. The strengths and weaknesses of metrics applied as research performance measures are examined. It is concluded that metrics have a useful role to play in the evaluation of research. Each metric employed, whether bibliometric, economic, co-occurrence, or others, brings a new dimension of potential insight to the complex problem of research assessment. However, when used in a stand-alone mode, metrics can be easily misinterpreted and result in misleading conclusions. Metrics should be an integral part of a more comprehensive approach to research evaluation, in which the leading role is assumed by expert peer review. Under this structure, the reviewers must be broadly constituted, so that the technical correctness of the research approaches being taken (doing the job right) can be evaluated by technical experts and the correctness of the research target (doing the right job) can be evaluated as well. This comprehensive approach insures quality in the implementation of existing research paradigms and allows the introduction of revolutionary new research paradigms as well. The views contained in this paper are solely those of the author and do not represent the views of the Department of the Navy. Ronald Kostoff received a Ph.D. from Princeton University, performed technical and economic research at Bell Laboratories, managed energy programs at U.S. Department of Energy, was Director of Technical Assessment at the Office of Naval Research for many years and presently manages the Navy’s In-House Laboratory Independent Research Program.  相似文献   
22.
This issue, redesigned in a new format, marks the beginning of Volume 25, the beginning of the silver anniversary year of the Journal of Abnormal Child Psychology. Data were compiled from the first 24 volumes to study changes over time, and Pearson correlations were calculated to determine linear trends in the journal's development The number of articles per volume has doubled, from about 25 to 50. In recent years the first authors of articles were more likely to be located outside the U.S. (up from about 5% to about 25%). Also, in recent years the first authors of articles were less likely to be affiliated with nonmedical school university departments and more likely to be affiliated with medical schools or research institutes. An introduction to this special 25th anniversary issue is provided.  相似文献   
23.
In this paper I discuss the ways in which experimental and objective research from cognitive science and developmental psychology can help analysts evaluate the theoretical models of mental objects which we use; I indicate the ways in which such evidence tends to support models of internal objects as mental representations or developmental capacities rather than as wish-fulfilling expressions of instinctual drives. This land of empirical evidence is not just of academic interest but also has direct clinical relevance, particularly with borderline patients; such patients' sense of identity is totally dependent on the analyst's understanding of their internal world and for this to be misunderstood by the analyst can be catastrophic. An accurate theoretical model of mental objects can therefore help analysts to contain their patients more effectively.  相似文献   
24.
We examined self- and cross-citation practices in JABA and JEAB from 1983 through 1992. Mean levels of self-citation for JABA and for JEAB were 22.6% and 36.1%, respectively. Overall, 2.4% of JABA citations were JEAB articles, and 0.6% of JEAB citations were JABA articles, which suggests limited integration of basic and applied research.  相似文献   
25.
Impressive reaffirmation of Jung's archetypal hypothesis has come from developments in behavioural biology (Tinbergen 1951; Cosmides 1985), psycholinguistics (Chomsky 1965), structural anthropology (Lévi-Strauss 1967), developmental psychology (Bowlby 1969), dream research (Jouvet 1975). neuroscience (MacLean 1976), sociobiology (Wilson 1978), and evolutionary psychiatry (Gardner 1988; Gilbert 1989). A close correspondence exists between Jungian theories of dreaming in human beings and modern biological theories of dreaming in animals. A paradigm shift is under way in the direction of a growing cross-disciplinary awareness that all human sciences are about archetypal manifestations and that these apply as much to the body as to the mind. Jungian psychology must keep abreast of these developments if it is not to be sidelined and superseded by less humane therapeutic philosophies.  相似文献   
26.
When the process of publication favors studies with smallp-values, and hence large effect estimates, combined estimates from many studies may be biased. This paper describes a model for estimation of effect size when there is selection based on one-tailedp-values. The model employs the method of maximum likelihood in the context of a mixed (fixed and random) effects general linear model for effect sizes. It offers a test for the presence of publication bias, and corrected estimates of the parameters of the linear model for effect magnitude. The model is illustrated using a well-known data set on the benefits of psychotherapy.Authors' note: The contributions of the authors are considered equal, and the order of authorship was chosen to be reverse-alphabetical.  相似文献   
27.
Positive and negative implications of two types of college-age narcissism on psychosocial functioning at midlife were studied in a longitudinal sample of women. Both types were scored with self-report measures when the women were, on the average, age 21. Throughout the first half of their adult life, high scorers on covert narcissism presented themselves as lacking in confidence and having low morale; high scorers on overt narcissism described themselves as wanting admiration, being independent, and being forceful. Positive outcomes associated with covert narcissism included the development of insight and of a differentiated sense of the self and, in the case of overt narcissism, entailed an involvement in high-status and creative work careers. At midlife, high scorers on covert narcissism experienced negative affect and feelings of being neglected, whereas high scorers on overt narcissism experienced family conflict and problems with impulse control. The personality characteristics associated with both types of narcissism remained stable from the early 20s to early 50s.  相似文献   
28.
29.
Conclusion The past one hundred fifty years of debate over the use of animals in research and testing has been characterized mainly byad hominem attacks and on uncritical rejection of the other sides’ arguments. In the classroom, it is important to avoid repeating exercises in public relations and to demand sound scholarship. This paper is a modification of material originally included in the handbook which accompanied the American Association for the Advancement of Science (AAAS) Seminar “Teaching Ethics in Science and Engineering”, 10–11 February 1993.  相似文献   
30.
A well-known result is that the usual correlation coefficient,, is highly nonrobust: very slight changes in only one of the marginal distributions can alter by a substantial amount. There are a variety of methods for correcting this problem. This paper identifies one particular method which is useful in psychometrics and provides a simple test for independence. It is not recommended that the new test replace the usual test ofH 0: = 0, but the new test has important advantages over the usual test in terms of both Type I errors and power.  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