全文获取类型
收费全文 | 82187篇 |
免费 | 3276篇 |
国内免费 | 45篇 |
出版年
2020年 | 923篇 |
2019年 | 1173篇 |
2018年 | 1634篇 |
2017年 | 1694篇 |
2016年 | 1731篇 |
2015年 | 1197篇 |
2014年 | 1473篇 |
2013年 | 6965篇 |
2012年 | 2610篇 |
2011年 | 2749篇 |
2010年 | 1713篇 |
2009年 | 1672篇 |
2008年 | 2522篇 |
2007年 | 2519篇 |
2006年 | 2214篇 |
2005年 | 2017篇 |
2004年 | 1940篇 |
2003年 | 1776篇 |
2002年 | 1830篇 |
2001年 | 2573篇 |
2000年 | 2451篇 |
1999年 | 1893篇 |
1998年 | 960篇 |
1997年 | 865篇 |
1996年 | 797篇 |
1995年 | 790篇 |
1994年 | 780篇 |
1993年 | 787篇 |
1992年 | 1580篇 |
1991年 | 1443篇 |
1990年 | 1481篇 |
1989年 | 1307篇 |
1988年 | 1302篇 |
1987年 | 1253篇 |
1986年 | 1272篇 |
1985年 | 1293篇 |
1984年 | 1096篇 |
1983年 | 976篇 |
1982年 | 763篇 |
1979年 | 1134篇 |
1978年 | 836篇 |
1975年 | 974篇 |
1974年 | 1028篇 |
1973年 | 1050篇 |
1972年 | 878篇 |
1971年 | 805篇 |
1969年 | 785篇 |
1968年 | 949篇 |
1967年 | 907篇 |
1966年 | 786篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
DAVID W. HEAD BECKY HEAD JAMES L. HEAD 《Journal of counseling and development : JCD》1985,63(10):621-624
Due to the death of a severely disabled infant from Bloomington, Indiana, a series of events set in motion by the U.S. Department of Health and Human Services has resulted in cautions to health care providers. The resulting policies and procedures warn hospital personnel against withholding nutritional sustenance or medical treatment from severely disabled infants. This article presents dimensions that might serve as a background for counselors to assist families in considering options related to disabled infants. These dimensions include the meaning of life, cost to benefit ratio, medical options, legal precedent, and a theological perspective. This issue is related to counseling practice through counselor ethics, values, and the need for information that counselors can provide to parents during the decision process. 相似文献
972.
L C Drickamer 《Journal of comparative psychology (Washington, D.C. : 1983)》1985,99(4):411-419
Five experiments were performed to investigate the effects of social status in groups of female mice on reproduction and on the release or urinary chemosignals that accelerate or delay the onset of sexual maturation in young females. Treatment of young female mice with urine from bottom-ranking mice in groups of 5 adult females resulted in delays in puberty comparable to those produced by treatment with urine pooled from females housed at moderate to high densities. Treatment of young females with urine from top-ranking females from the same groups resulted in ages for puberty not different from those of control females treated with water. There was an interaction between the social rank of a female and the stages of the estrous cycle with respect to the presence in the urine of chemosignals from grouping that delay puberty and estrus that accelerate puberty. Within groups of 5 adult mice, top-ranking females were in estrus more frequently than bottom-ranking females. Individually caged adult females treated with urine from top-ranking females were in estrus more frequently than females treated with urine from bottom-ranking females. When grouped females were separated into individual cages and mated, there was differential reproductive success: More top-ranking females conceived and bore litters than bottom-ranking females. Bottom-ranking females produced more female pups, relative to top- and middle-ranking females. 相似文献
973.
Lesley A. Owen 《Current Psychology》1985,4(2):108-118
Two experiments investigated whether the initial organization of ambiguous pictures presented supraliminally could be influenced
by the presentation of semantically related pictures that had been pattern masked to prevent conscious representation. Twenty-two
pictures were presented tachistoscopically in a counterbalanced sequence, each alternating with the supraliminal presentation
of its ambiguous counterpart. The results supported the hypothesis that pictures precluded from consciousness by pattern masking
could nevertheless influence the interpretation of ambiguous pictures. Although the possibility of structural priming could
not be completely ruled out in these experiments, there is evidence to suggest that semantic priming is a component. The research
potential of semantic priming is also discussed. 相似文献
974.
975.
Carl E. Granrud Albert Yonas Elizabeth A. Opland 《Attention, perception & psychophysics》1985,37(5):415-419
Five- and 7-month-old infants were tested for sensitivity to the depth cue of shading. Infants were presented with two displays: a surface in which a convexity and a concavity were molded and a photograph in which shading specified a convexity and a concavity. Each display was presented under both monocular and binocular viewing conditions. Reaching was observed as the dependent measure. Infants in both age groups reached preferentially for the actual convexity in both the monocular and binocular viewing conditions. In the monocular photograph condition, the 7-month-olds reached preferentially for the apparent convexity specified by shading, indicating that they perceived it to be an actual convexity. These infants showed no significant reaching preference in the binocular photograph condition. This finding rules out interpretations of the infants’ reaching not based on perceived depth. The results therefore suggest that the 7-month-olds perceived depth from shading. The 5-month-olds showed no significant reaching preferences when viewing the photograph; thus, they showed no evidence of depth perception from shading. These findings are consistent with the results of a number of studies that have investigated infants’ sensitivity to pictorial depth cues. Together, these studies suggest that the ability to perceive depth from pictorial cues may first develop between 5 and 7 months of age. 相似文献
976.
A M Austin 《Genetic, social, and general psychology monographs》1985,111(2):151, 153-151, 165
Forty-eight American children, 12 popular and 12 rejected children from Grades 3 and 6, were paired with same-sex friends and nonfriends on an interactive task. Children were videotaped and their interactions judged for the amount and type of attention each child in the dyad gave to each other and the conversation. Main dependent measures included mutual engagements, acknowledgement of the partner, getting the attention of the partner, attention to the conversation, and social impact of the utterances. Both rejected and popular children attended to the conversation and the partner, but rejected children appeared to overattend in several ways. The interactions of rejected children and their matches involved more mutual engagements, conversational initiators, facilitators, terminators, and nonverbal attention-getting devices. Sex and developmental effects were also found. 相似文献
977.
978.
979.
980.
An assessment of the Hasher and Zacks (1979) conceptualization of the automatic nature of the acquisition of spatial location information was made in the context of manipulations of subjects' intention to learn and mood state. The Velten (1968) mood induction procedure was used to establish depressed and nondepressed subjects. Half of each group was then presented with a matrix of geometric forms under instructions to learn the location of the forms (intentional) or to evaluate the pleasantness of the array (incidental). Subsequent tests of spatial location performance found no differences as a function of subjects' mood state, but did find a strong effect for instructional condition. The superior performance of the intentional subjects raises questions about the automatic nature of the encoding of spatial location. 相似文献