全文获取类型
收费全文 | 22162篇 |
免费 | 940篇 |
国内免费 | 14篇 |
出版年
2020年 | 262篇 |
2019年 | 251篇 |
2018年 | 427篇 |
2017年 | 381篇 |
2016年 | 409篇 |
2015年 | 254篇 |
2014年 | 374篇 |
2013年 | 1613篇 |
2012年 | 650篇 |
2011年 | 705篇 |
2010年 | 362篇 |
2009年 | 448篇 |
2008年 | 606篇 |
2007年 | 608篇 |
2006年 | 561篇 |
2005年 | 488篇 |
2004年 | 472篇 |
2003年 | 469篇 |
2002年 | 428篇 |
2001年 | 814篇 |
2000年 | 801篇 |
1999年 | 595篇 |
1998年 | 241篇 |
1997年 | 214篇 |
1996年 | 198篇 |
1992年 | 493篇 |
1991年 | 425篇 |
1990年 | 493篇 |
1989年 | 413篇 |
1988年 | 391篇 |
1987年 | 371篇 |
1986年 | 392篇 |
1985年 | 450篇 |
1984年 | 348篇 |
1983年 | 291篇 |
1982年 | 223篇 |
1979年 | 329篇 |
1978年 | 261篇 |
1977年 | 206篇 |
1976年 | 200篇 |
1975年 | 303篇 |
1974年 | 348篇 |
1973年 | 353篇 |
1972年 | 277篇 |
1971年 | 245篇 |
1970年 | 213篇 |
1969年 | 232篇 |
1968年 | 289篇 |
1967年 | 255篇 |
1966年 | 275篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
921.
922.
923.
The National Conference of Catholic Bishops has argued for significant government involvement in health care in order to assure respect for what they regard as the right to health care. Critics charge that the bishops are wrong because health care is not a right. In this article, it is argued that these critics are correct in their claim that health care is not a right. However, it is also argued that the premise that health care is not a right does not imply that the market is the most equitable and just system for providing health care. Natural law arguments in the tradition of Roman Catholic social teaching lead to the conclusion that a just and prosperous society has a moral obligation to provide health care even if there is no such right. Further, there are strong moral grounds for concluding that the bishops are correct in their claim that health care ought not to be considered a market commodity. It is argued that if health care ought not to be considered a commodity, then national health insurance is the best available alternative for fulfilling the social obligation to distribute health care resources justly and fairly at this time in American history. The bishops' case for government involvement can be made on the strength of the Catholic tradition in theological argumentation, independent of the claim that health care is a right. 相似文献
924.
College students periodically experience many challenges in pursuit of their educational goals. Such experiences can have
deleterious effects on subsequent motivation and performance when they are perceived as negative. Research shows that some
students who experience negative events are buffered against motivational deficits, whereas others are motivationally at-risk.
Several individual difference variables have been proposed to account for such diverse reactions. A longitudinal field study
that involved three phases was conducted to extend this research. Phase I examined the motivational buffering effects of academic
attributional style on students' performance, motivation, and emotions. Results indicated that attributional style related
to students' performance, motivation, and emotions. Specifically, students who routinely made unstable and controllable attributions
for negative academic events exhibited the greatest performance and motivation compared to students who typically made stable
and uncontrollable attributions. Phases II and III were designed to examine the remedial benefits of attributional retraining
for different attributional styles. Findings indicated that attributional retraining influenced motivation, emotions, and
course grade. These results were qualified by the interaction between attributional style, attributional retraining, and time.
Findings are discussed within Weiner's (1985, 1986) attribution theory.
This research was based, in part, on the first author's dissertation submitted to the Department of Psychology and the Faculty
of Graduate Studies of The University of Manitoba in partial fulfillment for the Degree of Doctor of Philosophy. This research
was supported by a Social Sciences and Humanities Research Council of Canada (SSHRCC) doctoral fellowship, a University of
Manitoba doctoral fellowship, and a SSHRCC postdoctoral fellowship to the first author. In addition, the research was also
supported by a SSHRCC research grant (#410911296) to the second author. The authors gratefully acknowledge the helpful comments
of Bernard Weiner, Harvey Keselman, John Adair, Rodney Clifton, and Robert Altemeyer. Also appreciated was the assistance
of Verena Menec and the Higher Education Research group. 相似文献
925.
René A. De Wijk Wim Vaessen Johannes Heidema E. P. Köster 《Behavior research methods》1996,28(3):383-391
An injection olfactometer for human psychophysical experiments is described. The olfactometer is capable of presenting, either mono- or birhinally, single odorants and binary mixtures. The pulse form of the olfactory stimulus at the exit of the olfactometer approaches a rectangular form, which makes the olfactometer well suited for olfactory reaction time measurements. Since stimulation periods are independent of the subject’s inhalation, time-intensity measurements over prolonged periods of time are possible as well. In the second part of this paper, a new technique is described for the measurement of the stimulus pulse form at the exit of the olfactometer. 相似文献
926.
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
927.
P. A. S. Breslin G. K. Beauchamp E. N. Pugh 《Attention, perception & psychophysics》1996,58(3):327-341
We investigated the ability of subjects to discriminate sugars with a whole-mouth forced-choice paradigm, in which a standard solution was compared with a test solution of varied concentration. Discrimination probabilities were U-shaped functions of test concentration: for 6 subjects and pairwise combinations of fructose, glucose, and sucrose, discriminability always declined to chance over a narrow range of test concentrations. At concentrations ≦ 100 mM, maltose was indiscriminable from fructose but discriminable at higher concentrations for 4 subjects. By analogy with themonochromacy of night vision, whereby any two lights are indiscriminable when their relative intensities are suitably adjusted, we call the gustatory indiscriminability of these sugarsmonogeusia. The simplest account of monogeusia is that all information about the indiscriminable sugars is represented by a single neural signal that varies only in magnitude. The discriminability of maltose from the other sugars at higher concentrations is consistent with the hypothesis that maltose also activates a second gustatory code. 相似文献
928.
During linear translation through a stationary environment, the pattern of optical flow generated on each retina is symmetrical when the head is aligned with the heading, but during lateral gaze the optical flow is asymmetric. We assessed whether human subjects could use the magnitude of this asymmetry to determine the direction of heading during passive translation through a 3-D environment. When allowed to move their heads in order to look in the direction of self-motion, subjects indicated their heading precisely and accurately. When the head was locked in alignment with the misaligned body, and gaze adjustments were not allowed, responses were quite precise, but showed a large bias which increased with increasing heading angle. 相似文献
929.
Sex Roles - Rape is an underreported and underconvicted crime. Therefore, many highly sexually aggressive men are missed by research employing judicial identification for sample selection. The... 相似文献
930.
PROFESSIONAL NETWORKS OF JUNIOR FACULTY IN PSYCHOLOGY 总被引:1,自引:0,他引:1
Suzanna M. Rose 《Psychology of women quarterly》1985,9(4):533-547
Composition and functioning of academics' professional networks were assessed in a study of 47 women and 43 men holding tenure-track assistant professor positions in psychology at sixty universities. Women's networks had significantly more women colleagues, more higher-status women colleagues, and fewer associates from their previous institutions than men's. Women also consistently rated their networks as less effective at helping them build a professional reputation. However, women were similar to men in terms of the number of "important colleagues" and higher status associates in their networks and ratings of colleagues' effectiveness at providing professional socialization, friendship, career information, and access to current research. The results suggest that by the third year at the assistant professor level, women in psychology have established a small same-sex support network, but that their larger network functioning may be beginning to diverge from men's in one important area: building a profesional reputation. Implications for women's career strategies are discussed. 相似文献