全文获取类型
收费全文 | 72517篇 |
免费 | 1358篇 |
国内免费 | 7篇 |
专业分类
73882篇 |
出版年
2020年 | 753篇 |
2019年 | 909篇 |
2018年 | 1213篇 |
2017年 | 1289篇 |
2016年 | 1374篇 |
2015年 | 989篇 |
2014年 | 1192篇 |
2013年 | 5253篇 |
2012年 | 2177篇 |
2011年 | 2175篇 |
2010年 | 1418篇 |
2009年 | 1319篇 |
2008年 | 1946篇 |
2007年 | 1952篇 |
2006年 | 1722篇 |
2005年 | 1595篇 |
2004年 | 1472篇 |
2003年 | 1381篇 |
2002年 | 1412篇 |
2001年 | 2179篇 |
2000年 | 2077篇 |
1999年 | 1590篇 |
1998年 | 726篇 |
1997年 | 665篇 |
1992年 | 1439篇 |
1991年 | 1308篇 |
1990年 | 1346篇 |
1989年 | 1185篇 |
1988年 | 1222篇 |
1987年 | 1148篇 |
1986年 | 1203篇 |
1985年 | 1220篇 |
1984年 | 1001篇 |
1983年 | 956篇 |
1982年 | 681篇 |
1981年 | 645篇 |
1979年 | 1147篇 |
1978年 | 769篇 |
1977年 | 722篇 |
1976年 | 686篇 |
1975年 | 946篇 |
1974年 | 1085篇 |
1973年 | 1145篇 |
1972年 | 924篇 |
1971年 | 882篇 |
1970年 | 843篇 |
1969年 | 879篇 |
1968年 | 1117篇 |
1967年 | 1000篇 |
1966年 | 871篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
Jeffrey L. Geller Jonathon Erlen Neil S. Kaye William H. Fisher 《Behavioral sciences & the law》1990,8(1):3-26
Feigned insanity in nineteenth-century America is appraised through a review of the medical and legal literature. The authors focus on the explanations for feigning, procedures used in uncovering feigning, and the role of feigning in the courtroom. This discussion of feigned insanity demonstrates the remarkable consistency of approach to this form of malingering over the past 200 years. 相似文献
902.
This study was designed to analyze whether Mental Rotation (MR) played a role as a mediating variable for sex-related differences in Visualization (VZ). Two psychometric tests measuring MR and VZ were applied to a representative sample of 309 males and 390 females in their last year of high school. Three non-zero correlations between sex and MR, sex and VZ, and MR and VZ were found, and the effect of sex on VZ was eliminated when MR was introduced as a covariable. When three subgroups of different VZ ability were made by dividing up the VZ distribution by the first and third quartiles, sex-differences were only found for the high-scorers group, for which previous results were replicated. Results clearly indicate that MR is a plausible mediator variable for sex differences in VZ when such differences do exist. Theoretical, methodological and practical consequences of these results are discussed. 相似文献
903.
The cloning of BRCA1, a susceptibility gene for inherited breast cancer, has made genetic screening possible for individuals and families whose medical histories are suggestive of an inherited predisposition to breast cancer. To date, few systematic attempts have been made to determine the level of knowledge about breast cancer genetics among women who are likely to seek BRCA1 screening when it becomes widely available. The present study attempted to assess the general knowledge about BRCA1 mutations in two groups: (1) first-degree relatives (FDRs) of breast cancer patients; and (2) women with a previous diagnosis of breast cancer. A self-administered, thirty-item questionnaire was developed through a pilot study. Ten of the items were objective, factual questions about breast cancer genetics. Responses to these questions were used to generate an overall knowledge score for each respondent. The study population was moderately knowledgeable about breast cancer genetics, with an average score of 5.35 out of 10. Counselors should not underestimate the importance of evaluating each counselee's existing knowledge about breast cancer, which can affect the provision and reception of genetic information. In particular, specific areas of knowledge that may be confusing or misunderstood were identified and these topics are discussed in detail. 相似文献
904.
After a short introduction into the changing nature of our society and organizations, we outline two kinds of flexibility of labor: qualitative flexibility, that is the degree to which people who work in or for a certain organization can and do perform different tasks, and quantitative flexibility, that is, varying the quantity of personnel and their working hours. Then, the different ways in which we organize our work and organizations are dealt with in terms of quantitative and qualitative flexibility. Next, we survey these ways of organizing on the degree to which they moderate the positive individual outcomes, or individual goals, of work. It can be concluded that quantitatively flexible work, besides some minor positive consequences, may have serious negative consequences for one's well-being, health, and personal development, while qualitative flexibility may have many more advantages, though it may lead to a devastating task overload. Last, we explore some ways to alleviate these negative effects. 相似文献
905.
Control theory was used to investigate identity microprocesses (i.e., self-verification)within the context of serious dating relationships. Forty-two college women importance for, and certainty about, their future career identities served as targets in the study. The targets and their dating partners participated in a procedure in which the targets received career information that was contrary to their beliefs about their future identities. Results revealed that women who were highly certain about their future career identity, regardless of its importance level, engaged in more self-verification efforts than did women who were uncertain. A comparison of congruent (partner herself) and incongruent dating partners revealed that congruent partners were the most overt in their disagreement with the contrary information. Certainty and partner congruence predicted the target's self-rating change following the identity disruption. Partner congruence accounted for a substantial amount of variance in self-rating change, indicating that close relationships provide an influential context for identity development. 相似文献
906.
907.
Donald L. McCabe 《Science and engineering ethics》1997,3(4):433-445
The topic of cheating among college students has received considerable attention in the education and psychology literatures. But most of this research has been conducted with relatively small samples and individual projects have generally focused on students from a single campus. These studies have improved our understanding of cheating in college, but it is difficult to generalize their findings and it is also difficult to develop a good understanding of the differences that exist among different academic majors. Understanding such differences may be important in developing improved strategies for combating college cheating. The objective of this paper is to examine the relation between cheating and the choice of academic major with a particular focus on natural science and engineering majors. The data source for this analysis is a study of over 4,000 students from 31 campuses which was conducted in the 1995–1996 academic year. 相似文献
908.
McGlinchey-Berroth R 《Trends in cognitive sciences》1997,1(3):91-97
Hemispatial neglect is a complex neuropsychological disorder characterized by a severe attentional deficit that produces a lack of awareness for information appearing in contralesional hemispace. Despite this lack of phenomenal awareness, recent studies suggest that a great deal of visual information processing does occur and can influence the performance of patients in certain tasks. The current review will present this evidence and suggest a new theoretical framework that may help to direct future research into uncovering the underlying mechanism(s). 相似文献
909.
910.
The focus of the present study was on determining whether the high level of directional accuracy found in aiming studies in which the subjects can see their hand in the visual periphery supports the existence of a kinetic visual channel or, rather, the advantage of binocular over monocular vision for movement directional control. The limits of this kinetic visual channel were also explored. The results of the 1st experiment indicated that seeing one's hand in the visual periphery is sufficient to ensure optimal directional aiming accuracy. Further, no differences in aiming accuracy were noted between monocular and binocular vision. These results supported the existence of a visual kinetic channel. In the 2nd experiment, whether this kinetic visual channel would operate with movements slower (55 degrees /s) than those usually used in studies that had proved its existence (over 110 degrees /s) was delineated. The results indicated that this visual kinetic channel was operative even at relatively slow movement velocities. Central vision of the hand seemed to be used for on-line directional control of relatively slow movements. 相似文献