全文获取类型
收费全文 | 6330篇 |
免费 | 369篇 |
专业分类
6699篇 |
出版年
2024年 | 15篇 |
2023年 | 85篇 |
2022年 | 103篇 |
2021年 | 141篇 |
2020年 | 204篇 |
2019年 | 188篇 |
2018年 | 372篇 |
2017年 | 370篇 |
2016年 | 314篇 |
2015年 | 185篇 |
2014年 | 216篇 |
2013年 | 805篇 |
2012年 | 440篇 |
2011年 | 448篇 |
2010年 | 266篇 |
2009年 | 152篇 |
2008年 | 373篇 |
2007年 | 292篇 |
2006年 | 278篇 |
2005年 | 193篇 |
2004年 | 167篇 |
2003年 | 157篇 |
2002年 | 123篇 |
2001年 | 62篇 |
2000年 | 73篇 |
1999年 | 57篇 |
1998年 | 43篇 |
1997年 | 42篇 |
1996年 | 26篇 |
1995年 | 19篇 |
1994年 | 35篇 |
1993年 | 27篇 |
1992年 | 20篇 |
1991年 | 35篇 |
1990年 | 26篇 |
1989年 | 24篇 |
1988年 | 18篇 |
1987年 | 20篇 |
1986年 | 15篇 |
1985年 | 29篇 |
1984年 | 19篇 |
1983年 | 14篇 |
1982年 | 20篇 |
1981年 | 23篇 |
1980年 | 13篇 |
1979年 | 20篇 |
1974年 | 14篇 |
1968年 | 11篇 |
1966年 | 11篇 |
1965年 | 11篇 |
排序方式: 共有6699条查询结果,搜索用时 15 毫秒
31.
32.
K. Lissák 《Integrative psychological & behavioral science》1969,4(3):145-154
Recent observations on the plasticity of brain and behavior relationships indicate that the temporary connections between environmental and neuroanatomical substrates have tremendous specificity but at the same time are very plastic. Establishment of a conditional reflex by stimulation of the hippocampal pyramidal layer and/or the mesencephalic reticular formation did not interfere with the differential stimulation of very near points in the same structures. These correlations between brain and behavior confirmed the earlier belief that the development of temporary connections between environment and brain is an elementary process of the central nervous system. Complex behavioral functions are organized through both neuronal and humoral afferentation. Data accumulated recently indicate that the descending forebrain influence is inhibitory in the brain stem and diencephalon and controls the sensory input in a somatomotor-specific and situation-specific manner. Humoral factors affecting thresholds can change the dynamic equilibrium existing between ascending excitatory and descending inhibitory systems; these alterations always follow the rule of situation and somatomotor specificity. 相似文献
33.
Ås, A. Non-hypnotic experiences related to hypnotizability in male and female college students. Scand. J. Psychol ., 1962, 3 , 112–131.—Some recent research on the relation between subjective experiences and hypnotic susceptibility is reviewed. In a male sample of 50 subjects significant correlations between scores on the Experience Inventory and hypnotizability were found. A cross-validation of composite experience scores on this sample and a female sample studied earlier gave positive results. Based on several sources of data a preliminary analysis is made of the similarities and differences between male and female students regarding experiences related to hypnotizability. 相似文献
34.
35.
G. A. Nesvetailov’s 《Knowledge, Technology, and Policy》1993,6(1):38-51
In this paper a method is outlined for measuring the diversity of the results of applied R&D with the use of IPC (International
Patent Classification). The method has been tested in the contexts of the academic physical, engineering, and chemical institutes.
The trend of applied research at a given institute increases both at the level of classes and subclasses, and at the IPC level.
Inventions developed within specializations at each institute have a greater efficiency than other forms of inventive activity.
The objective was to seek the optimal extent of diversification of applied R&D, which would simultaneously ensure the preservation
of the scientific specialization of an institute, the high level of scientific research associated with developing innovations,
and the high overall efficiency of each institute. 相似文献
36.
Marja Alestalo’s 《Knowledge, Technology, and Policy》1993,6(1):52-66
Finland has followed the Scandinavian model of the welfare state in which the level of state activism is high, the economic
pressures on the scientific activities are strong, and the left-wing parties and the Center Party have formulated the main
ideas. In the 1970s welfare ideology was adopted in science policy by emphasizing the promotion of socially relevant scientific
activities and the expansion of the university system as a means of effecting equal opportunity. Currently, the trend is toward
a mixed welfare economy. Programs have been prepared in spite of the radical cut in government expenditure, and without a
consideration of the long-term consequences. 相似文献
37.
When an observer views a moving scene binocularly, both motion parallax and binocular disparity provide depth information. In Experiments lA-1C, we measured sensitivity to surface curvature when these depth cues were available either individually or simultaneously. When the depth cues yielded comparable sensitivity to surface curvature, we found that curvature detection was easier with the cues present simultaneously, rather than individually. For 2 of the 6 subjects, this effect was stronger when the component of frontal translation of the surface was vertical, rather than horizontal. No such anisotropy was found for the 4 other subjects. If a moving object is observed binocularly, the patterns of optic flow are different on the left and right retinae. We have suggested elsewhere (Cornilleau-Pérès & Droulez, in press) that this motion disparity might be used as avisual cue for the perception of a 3-D structure. Our model consisted in deriving binocular disparity from the left and right distributions of vertical velocities, rather than from luminous intensities, as has been done in classical studies on stereoscopic vision. The model led to some predictions concerning the detection of surface curvature from motion disparity in the presence or absence of intensity-based disparity (classically termedbinocular disparity). In a second set of experiments, we attempted to test these predictions, and we failed to validate our theoretical scheme from a physiological point of view. 相似文献
38.
Manuel Ruiz Ruiz Ph.D. M.D. Patricia Fernández-Baca M.D. Gloria Busby M.A. 《Journal of Contemporary Psychotherapy》1993,23(1):61-67
Paradigmatic complexes in family psychotherapy have been indicating a revolutionary change and the creation of new paradigms for the past thirty years. Starting with the application of the general systems theory and the development of those concepts that have been emerging regarding psychosomatic illnesses we discuss the epistemological confusion created, the methodological problems and the dissociation between theory and practice. We suggest a double process of investigation of the family structure using a knowledge of the basic attitudes and the development of a psychotherapy programme within the family of the psychosomatic patient. 相似文献
39.
Anxiety 总被引:1,自引:0,他引:1
Hal Ritter Ph.D. 《Journal of religion and health》1990,29(1):49-53
The analysis is a study of the nature of anxiety in human experience. The author reviews the work of theologian Paul Tillich and psychologist Rollo May and clarifies the role of anxiety in life. The article reflects the need for a basic religious affirmation as one faces the anxiety of life which comes from the many threats to human existence. 相似文献
40.
The Priestley duality for Wajsberg algebras 总被引:1,自引:1,他引:0
N. G. Martínez 《Studia Logica》1990,49(1):31-46
The Priestley duality for Wajsberg algebras is developed. The Wajsberg space is a De Morgan space endowed with a family of functions that are obtained in rather natural way.As a first application of this duality, a theorem about unicity of the structure is given. 相似文献