全文获取类型
收费全文 | 88033篇 |
免费 | 3423篇 |
国内免费 | 27篇 |
出版年
2019年 | 1056篇 |
2018年 | 1433篇 |
2017年 | 1441篇 |
2016年 | 1565篇 |
2015年 | 1129篇 |
2014年 | 1357篇 |
2013年 | 7327篇 |
2012年 | 2448篇 |
2011年 | 2628篇 |
2010年 | 1653篇 |
2009年 | 1628篇 |
2008年 | 2390篇 |
2007年 | 2320篇 |
2006年 | 2141篇 |
2005年 | 1861篇 |
2004年 | 1742篇 |
2003年 | 1695篇 |
2002年 | 1776篇 |
2001年 | 2776篇 |
2000年 | 2696篇 |
1999年 | 2075篇 |
1998年 | 978篇 |
1997年 | 896篇 |
1996年 | 1010篇 |
1995年 | 933篇 |
1994年 | 884篇 |
1993年 | 905篇 |
1992年 | 1888篇 |
1991年 | 1732篇 |
1990年 | 1722篇 |
1989年 | 1557篇 |
1988年 | 1519篇 |
1987年 | 1502篇 |
1986年 | 1533篇 |
1985年 | 1549篇 |
1984年 | 1344篇 |
1983年 | 1179篇 |
1981年 | 897篇 |
1979年 | 1352篇 |
1978年 | 995篇 |
1975年 | 1178篇 |
1974年 | 1219篇 |
1973年 | 1336篇 |
1972年 | 1203篇 |
1971年 | 1078篇 |
1970年 | 990篇 |
1969年 | 1000篇 |
1968年 | 1252篇 |
1967年 | 1103篇 |
1966年 | 1001篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
921.
Frontal lobe dysfunction and memory impairment in patients with chronic progressive multiple sclerosis 总被引:2,自引:0,他引:2
Deficits in semantic encoding have been described in patients with frontal lobe disease who also show memory impairments. As a group, patients with multiple sclerosis (MS) exhibit memory impairment, fail to make effective use of semantic encoding to aid memory, and perform poorly on verbal fluency and concept formation tests which are sensitive to frontal lobe damage. In the present study the semantic encoding capacity of MS patients was measured using a modification of Wicken's release from proactive interference (PI) paradigm. Individual patients varied considerably in the severity of their impairments on verbal fluency, verbal recognition memory and on Wisconsin Card Sorting Task, but even patients who evidenced both memory impairment and signs of frontal lobe dysfunction showed normal release from PI after a categorical shift. Memory disturbances in MS are unlikely to result from an incapacity for semantic encoding, which seems preserved in MS, but may arise instead from deficits in processing information rapidly. 相似文献
922.
This study compared the temporal organization of graphic movements executed either actually or mentally. Six subjects had to perform two tasks, writing a sentence and drawing a cube, either as a real performance or as an imagined one, with either the right or the left hand, and with either a small or a large tracing amplitude. In the same subject, for the same hand, mental and actual movement times were both very stable and very close from trial to trial regardless of the tracing amplitude. Thus, mental movements mimic closely real movements in their temporal organization and are likely to involve the same planning program. 相似文献
923.
D A Nelson 《Journal of comparative psychology (Washington, D.C. : 1983)》1989,103(2):171-176
Estimate the amount of frequency variation that affected individual and species recognition by song in territorial male field sparrows with field playbacks of neighbors' songs lowered in frequency in 6 increments between 324 and 1296 Hz. Males gave strong responses to neighbors' songs that had been lowered by about 400 Hz, which is about 11% of the mean midfrequency in field sparrow song. Territorial responses were eliminated when neighbors' songs were lowered by more than about 900 Hz. Thus, there is a fairly narrow range of frequencies within which field sparrow songs can vary while functioning in communication. Ss' responses appear to be constrained by the normal range of song frequency variation within the species, but the range of variability within songs of individuals did not influence the degree of frequency shift required to render neighbors' songs unfamiliar. 相似文献
924.
JOHN GUIDUBALDI JOSEPH D. PERRY MARTHA WALKER 《Journal of counseling and development : JCD》1989,68(2):160-165
Remedial strategies for children and adolescents with disabilities should have their roots in assessment. In this article the authors discuss improvements in assessment approaches, including new standards for psychological testing, updated and renormed cognitive assessments, and vocational assessments with increased ecological validity. The combined efforts of school psychologists, rehabilitation counselors, vocational evaluators, psychologists, and school counselors have yielded progress in the technical qualities of assessment and utilization. Through comprehensive and functional assessment, students with disabilities should find the transition from school to work with greater success. 相似文献
925.
J M Stern S K Johnson 《Journal of comparative psychology (Washington, D.C. : 1983)》1989,103(3):269-280
Prior to assuming the upright crouching posture over their pups during nursing bouts, lactating rats typically engage in several oral behaviors, including nuzzling, licking and rearranging pups. By acutely depriving dams of various aspects of perioral stimulation from pups (with anesthesia of the mystacial pads or of the tongue, with mouth suturing, or with muzzling), we found the following: (1) Distal stimulation from pups maintains proximity-seeking behavior, but is insufficient to stimulate nursing behavior. (2) Lack of tongue feedback decreases pup licking and hastens the onset of crouching. (3) Snout, but not tongue, contact with pups is required for hovering over them. (4) The position of the dam while hovering over her litter enables the pups to gain access to her ventrum, thereby provoking her upright, crouching posture. (5) Older pups are capable of bypassing the dam's perioral attentions and stimulating crouching directly by burrowing under the dam's ventrum. 相似文献
926.
Relationship of racial stressors to blood pressure responses and anger expression in black college students 总被引:5,自引:0,他引:5
The physiological effects of racism, as a stressor, were examined as they related to blood pressure (BP) and anger experiences in Black college students. Current research has failed to consider the stressful effects of racism as a factor contributing to the higher incidence of essential hypertension among Blacks. Twenty-seven Black college students viewed three excerpts showing racist situations involving Blacks; anger-provoking, nonracist situations; and neutral situations. After each scene, BP was taken, and a mood checklist was administered. The Framingham Anger Scale and the Anger Expression Scale were administered. Analyses revealed that BP significantly increased during the presentation of racist stimuli but not of anger-provoking or neutral stimuli. Self-reports of state anger, as measured by the mood checklist, were significant for both the anger-provoking and racist stimuli. BP scores were significantly correlated to the two trait anger measures. Exposure to racist stimuli was associated with BP increases among Blacks. Such cumulative exposure to racism may have important implications for the etiology of essential hypertension. 相似文献
927.
A cross-sex difference on one variable is often hypothesized to be related to a gender difference on a second variable. However, caution should be exercised in making such comparative hypotheses. We gathered the expected and actual examination grades for 168 female and 163 male college students. As in prior research, males had higher expectancies than females (p<.05). But analysis of the intrasex regression equations indicated that the relationship of expectancies to performance was different for women than it was for men. Thus, a cross-sex difference in expectancies did not correspond to a parallel difference in grades. This finding highlights the potential hazards of making certain cross-sex comparisons, and we argue for more caution in their application. 相似文献
928.
John T. Salvendy M.D. 《Group》1989,13(1):43-57
Brief group psychotherapy as a method of treating psychological aftereffects of retirement is still in its infancy. It is therefore still possible to outline the whole field in overview. This paper examines the dynamics of aging and the relevant literature, discusses the conceptual issues involved, and describes techniques employed with this specific population. The typical cluster of complaints is portrayed, the psychological stressors associated with retirement are analyzed, and the various group-therapeutic modalities developed to counteract them are described. Furthermore, the rationale, process and characteristics of short-term group psychotherapy in the treatment of adjustment difficulties to retirement are reviewed. The clinical application of this approach, the therapist's particular roles and the therapeutic impact of this method are delineated.He would like to thank his co-therapist, Mrs. Sophie Bielawski, Reg. O.T., for her support and helpful observations and Drs. J. Regan and E. Sunday for their advice on methodolody. 相似文献
929.
930.