全文获取类型
收费全文 | 27358篇 |
免费 | 1173篇 |
国内免费 | 9篇 |
出版年
2020年 | 294篇 |
2019年 | 328篇 |
2018年 | 486篇 |
2017年 | 479篇 |
2016年 | 522篇 |
2015年 | 399篇 |
2014年 | 506篇 |
2013年 | 2477篇 |
2012年 | 893篇 |
2011年 | 882篇 |
2010年 | 592篇 |
2009年 | 574篇 |
2008年 | 850篇 |
2007年 | 824篇 |
2006年 | 776篇 |
2005年 | 763篇 |
2004年 | 721篇 |
2003年 | 667篇 |
2002年 | 716篇 |
2001年 | 886篇 |
2000年 | 843篇 |
1999年 | 638篇 |
1998年 | 366篇 |
1997年 | 357篇 |
1996年 | 304篇 |
1995年 | 298篇 |
1994年 | 283篇 |
1993年 | 288篇 |
1992年 | 518篇 |
1991年 | 474篇 |
1990年 | 492篇 |
1989年 | 419篇 |
1988年 | 397篇 |
1987年 | 403篇 |
1986年 | 367篇 |
1985年 | 394篇 |
1984年 | 409篇 |
1983年 | 388篇 |
1982年 | 333篇 |
1981年 | 291篇 |
1980年 | 259篇 |
1979年 | 346篇 |
1978年 | 341篇 |
1977年 | 294篇 |
1976年 | 285篇 |
1975年 | 328篇 |
1974年 | 379篇 |
1973年 | 333篇 |
1972年 | 255篇 |
1968年 | 278篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
Jennifer L. Fitzpatrick Elaine M. Hutton Riyana Babul Cheryl S. Cytrynbaum Joanne E. Sutherland Cheryl T. Shuman 《Journal of genetic counseling》1996,5(1):1-15
Congenital bilateral absence of the vas deferens (CBAVD) occurs in approximately 1.3% of infertile males and is thought to be, in most cases, a primarily genital form of cystic fibrosis (CF). Fourteen males with CBAVD considering microsurgical sperm aspiration from the epididymis (MESA) and in vitro fertilization were seen for genetic counseling and screening for CF. To retrospectively evaluate these patients' perceptions of the counseling and screening information, we conducted structured telephone interviews to assess their recall of information about CF and its impact on their health concerns and reproductive plans. We found that, as the health implications of CF are abstract and not as important to patients as the diagnosis of CBAVD itself, patients tend to view their CF status primarily in terms of their reproductive potential. Retrospective analysis afforded us an opportunity to identify the psychosocial issues of most concern to this unique patient population. 相似文献
972.
973.
974.
John E. Carr 《Journal of clinical psychology in medical settings》1996,3(2):141-144
Despite advances in behavioral medicine and health psychology, the health care system and medical education continue to show resistance to a truly biopsychosocial model of medical practice. Psychologists in medical settings have generally been identified as challenging the concept of mind-body duality and the segregation of biologic and psychosocial sciences in medicine. However, examples are presented of how psychologists contribute to and perpetuate mind-body segregation via exclusive theoretical conceptualizations, arbitrary definitions of professional behavior, and dogmatic constraints on the limits of psychology's field of knowledge. 相似文献
975.
Lynn Hasher Rose T. Zacks Ellen R. Stoltzfus Michael J. Kane S. Lisa Connelly 《Psychonomic bulletin & review》1996,3(2):231-237
In two experiments, the pattern of persistence of negative priming effects across delay intervals of 500 and 2,500 msec was assessed using a within-subjects, random sequencing of delays. Neill and Valdes (1992; Neill, Valdes, Terry, & Gorfein, 1992) have argued that a within-subject experimental design is required for decay of negative priming to be seen, in contrast to results reported elsewhere (e.g., Tipper, Weaver, Cameron, Brehaut, & Bastedo, 1991) showing stable negative priming effects across delays. In neither experiment was substantial evidence of decay detected, raising questions for the notion that suppression necessarily declines across brief temporal intervals and for the assertion that episodic retrieval is the sole source of negative priming. 相似文献
976.
A series of experiments investigated concurrent discriminations of surface and nonsurface attributes, including color, brightness, texture, length, location, and motion. In all cases but one, results matched those previously reported: Interference occurred when two discriminations concerned different objects, but not when they concerned the same one. In the two-object case, interference was the same whether discriminations were similar (e.g., two surface discriminations) or different (e.g., one surface, one boundary). Such results support a model of visual attention in which separate visual subsystems are coordinated, converging to work on surface and boundary properties of the same selected object. A partial exception is color: For reasons that are unclear, color escapes twoobject interference except from other, concurrent surface discriminations 相似文献
977.
To obtain insight into the control of fixation duration during visual search, we had 4 subjects perform simple search tasks in which we systematically varied the discriminability of the target. The experiment was carried out under two conditions. Under the first condition (blocked), the discriminability of the target was kept constant during a session. Under the second condition (mixed), the discriminability of the target varied per trial. Under the blocked condition, fixation duration increased with decreasing discriminability. For 2 subjects, we found much shorter fixation durations in difficult trials with the mixed condition than in difficult trials with the blocked condition. Overall, the subjects fixated the target, continued to search, and then went back to the target in 5%–55% of the correct trials. In these trials, the result of the analysis of the foveal target was not used for preparing the next saccade. The results support a preprogramming model of the control of fixation duration. In a simple search task, control of fixation duration appears to be indirect. 相似文献
978.
Victor J. Perotti James T. Todd J. Farley Norman 《Attention, perception & psychophysics》1996,58(5):666-679
Four experiments investigated observers’ judgments of rigidity for different types of optical motion. The depicted structural deformations were of two types: (1) those with nonparallel image trajectories that are detectable from the first-order spatiotemporal relations between pairs of views; and (2) those with parallel image trajectories that can only be detected from higher order relations among three or more views. Patterns were composed of smooth flow fields in Experiments 1 and 3, and of wire frame figures in Experiments 2 and 4. For both types of display, the nonrigidity detectable from the first-order spatiotemporal structure of the motion sequence was much more salient than the deformation detectable only from the higher order spatiotemporal structure. These results indicate that observers’ judgments of rigidity are based primarily on a two-view analysis, but that some useful information can be obtained under appropriate circumstances from higher order spatiotemporal relations among three or more views. 相似文献
979.
Active and passive avoidance following the administration of systemic DSP4, xylamine, or p-chloroamphetamine 总被引:3,自引:0,他引:3
Groups of rats were administered either DSP4 (50 mg/kg, ip), xylamine (50 mg/kg, ip), or p-chloroamphetamine (2 X 10 mg/kg, ip), either 2 weeks or 1 week before the testing of two-way active avoidance. DSP4 and xylamine, the selective noradrenaline (NA) neurotoxins, caused a two-way avoidance impairment but p-chloroamphetamine, the selective 5-hydroxytryptamine (5-HT) neurotoxin, did not do so. Pretreatment with desipramine (20 mg/kg, ip) blocked the avoidance impairment caused by DSP4 and xylamine treatment. Neither DSP4 nor xylamine caused any alteration of passive avoidance retention. The biochemical analyses indicated severe NA, but not 5-HT, depletions in the DSP4 and xylamine conditions and drastic 5-HT, but not NA, depletions in the p-chloroamphetamine conditions. These results confirm and extend earlier findings concerning the role of NA in avoidance behavior. 相似文献
980.
The purpose of this paper is to review the necessary components of a comprehensive group therapy program. The balancing between the didactic and the experiential portions, and an analysis of the selection criteria, along with the rationale for a particular sequencing of elements in the curriculum, are discussed. A line between supervision and personal therapy is drawn. The author describes the milieu necessary for a successful training program to evolve and makes suggestions for improvements. The various experiential aspects of training are presented and critically evaluated. The training situation is examined from the point of view of the faculty, the trainee and the patients involved. The author marshalls evidence indicating that personal group psychotherapy in a patient group is the preferred form for most trainees for the experiential part of the program. The paper concludes that the sharing and cohesiveness of training philosophies and methods by the faculty is a prerequisite to the success of any training program. 相似文献