全文获取类型
收费全文 | 1929篇 |
免费 | 68篇 |
专业分类
1997篇 |
出版年
2020年 | 32篇 |
2018年 | 28篇 |
2017年 | 36篇 |
2016年 | 39篇 |
2015年 | 35篇 |
2014年 | 40篇 |
2013年 | 204篇 |
2012年 | 80篇 |
2011年 | 60篇 |
2010年 | 34篇 |
2009年 | 29篇 |
2008年 | 62篇 |
2007年 | 60篇 |
2006年 | 55篇 |
2005年 | 54篇 |
2004年 | 51篇 |
2003年 | 49篇 |
2002年 | 59篇 |
2001年 | 35篇 |
2000年 | 27篇 |
1999年 | 25篇 |
1998年 | 29篇 |
1997年 | 31篇 |
1996年 | 35篇 |
1995年 | 36篇 |
1994年 | 32篇 |
1993年 | 24篇 |
1992年 | 27篇 |
1991年 | 26篇 |
1990年 | 26篇 |
1989年 | 29篇 |
1988年 | 21篇 |
1987年 | 25篇 |
1986年 | 21篇 |
1985年 | 30篇 |
1984年 | 36篇 |
1983年 | 33篇 |
1982年 | 39篇 |
1981年 | 27篇 |
1980年 | 37篇 |
1979年 | 30篇 |
1978年 | 28篇 |
1977年 | 39篇 |
1976年 | 44篇 |
1975年 | 22篇 |
1974年 | 41篇 |
1973年 | 26篇 |
1972年 | 12篇 |
1969年 | 16篇 |
1967年 | 13篇 |
排序方式: 共有1997条查询结果,搜索用时 15 毫秒
51.
This paper describes the basic elements of practice development and management within the academic medical setting. These include assessment of the market environment, both in the community and within the medical setting, product development, marketing, budget basics, quality, managed care negotiations, and finding time to do research in a financially-driven health care system. 相似文献
52.
Ronald J. Burke 《International journal of stress management》1997,4(1):13-27
This study examined a research model developed to understand psychological burnout among police officers. Data were collected
from 828 men and women in police work using questionnaires completed anonymously. Five groups of predictor variables identified
in previous research were considered: individual demographic and situational variables, work stressors, stressful events,
work-family conflict and coping responses. Sources of stress (chronic stressors, stressful events, work-family conflict) were
significantly related to levels of psychological burnout when individual demographic and situational variables were controlled. 相似文献
53.
Ronald N. Kostoff Ph.D. 《Science and engineering ethics》1997,3(2):109-120
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
54.
Ronald Hübner 《Attention, perception & psychophysics》1997,59(2):187-201
There are many conditions in which identification proceeds faster for the global form of a hierarchical pattern than for its local parts. Since the global form usually contains more lower spatial frequencies than do the local forms, it has frequently been suggested that the higher transmission rate of low spatial frequencies is responsible for the global advantage. There are also functional hemispheric differences. While the right hemisphere is better at processing global information, the left hemisphere has an advantage with respect to local information. In accordance with the spatial-frequency hypothesis, it has been speculated that this difference is due to a differential capacity of the hemispheres for processing low and high spatial frequencies. To test whether low spatial frequencies were responsible for the global advantage and/or for the observed hemispheric differences, two experiments were carried out with unfiltered and highpass-filtered compound-letter stimuli presented at the left, right, or center visual field. The first experiment, in which the target level was randomized in each trial block, revealed that low spatial frequencies were not necessary for either global advantage or for hemispheric differences. Highpass filtering merely increased the response times. In the second experiment, the target level was held constant in each block. This generally increased the speed of responding and produced interactions between filtering and global-local processing. It was concluded that both sensory and attentional or control mechanisms were responsible for global precedence and that the hemispheres differed with respect to the latter. 相似文献
55.
Ronald A. Kleinknecht 《Behaviour research and therapy》1994,32(8):817-823
The origins of fear and phobia of blood, injury, and injections were investigated in a sample of 128 fearful university students. Based on Mutilation Questionnaire scores, subjects were designated as common fear, high fear, or phobic. Ss reports of their onset experiences obtained from structured interviews were categorized into one or more acquisition pathways of conditioning, vicarious observation, and information. Of the 73% of Ss who recalled one or more onset experiences, 76% reported conditioning-like events as the primary pathway with the majority reporting fear-related UCSs. Vicarious experiences were reported as primary by 20% and 3% reported information as being primary in their fear onset. Severity of fear was unrelated to the pathway by which it was acquired, to whether the onset was recalled, and if recalled, whether it was due to a single or to multiple traumatic events. Results are discussed in terms of methodological problems of memory issues and means by which data are collected. 相似文献
56.
G rünbaum , A dolf . Validation in the Clinical Theory of Psychoanalysis: A Study in the Philosophy of Psychoanalysis
H ollis , J ames . The Middle Passage: From Misery to Meaning in Midlife
B ertoia , J udi . Drawings from a Dying Child: Insights into Death from a Jungian Perspective
H olt , D avid . The Psychology of Carl Jung: Essays in Application and Deconstruction 相似文献
H ollis , J ames . The Middle Passage: From Misery to Meaning in Midlife
B ertoia , J udi . Drawings from a Dying Child: Insights into Death from a Jungian Perspective
H olt , D avid . The Psychology of Carl Jung: Essays in Application and Deconstruction 相似文献
57.
A DEVELOPMENTAL DEFICIT IN LOCALIZING OBJECTS FROM VISION 总被引:3,自引:0,他引:3
Michael McCloskey Brenda Rapp Steven Yantis Gary Rubin William F. Bacon Gislin Dagnelie Barry Gordon Donna Aliminosa Dana F. Boatman William Badecker Douglas N. Johnson Ronald J. Tusa Erica Palmer 《Psychological science》1995,6(2):112-117
Abstract— We describe a college student, A. H., with a developmental deficit in determining the location of objects from vision. The deficit is selective in that (a) localization from auditory or tactile information is intact, (b) A H reports the identity of mislocalized objects accurately, (c) visual localization errors preserve certain parameters of the target location, and (d) visual localization is severely impaired under certain stimulus conditions, but nearly intact under other conditions. These results bear on the representation and processing of location information in the visual system, and also have implications for understanding developmental dyslexia. 相似文献
58.
59.
60.
Ronald Laymon 《Synthese》1994,99(1):23-58
Maxwell claimed that the electrostatic inverse square law could be deduced from Cavendish's spherical condenser experiment. This is true only if the accuracy claims made by Cavendish and Maxwell are ignored, for both used the inverse square law as a premise in their analyses of experimental accuracy. By so doing, they assumed the very law the accuracy of which the Cavendish experiment was supposed to test. This paper attempts to make rational sense of this apparently circular procedure and to relate it to some variants of traditional problems concerning old and new evidence.My interest in demonstrative induction developed as the result of being given the opportunity by Joseph Pitt to comment on an earlier version of John Norton's Science and Certainty (1994) at a conference held at the Virginia Polytechnic Institute and State University. I want to thank Joe and John for much stimulating discussion and John specifically for sharing his work on demonstrative induction with me. My gratitude also goes to the National Science Foundation (DIR-8920699) and Ohio State University for providing funding for a larger project of which this paper forms a part. 相似文献