全文获取类型
收费全文 | 8515篇 |
免费 | 359篇 |
国内免费 | 3篇 |
专业分类
8877篇 |
出版年
2021年 | 67篇 |
2020年 | 119篇 |
2019年 | 147篇 |
2018年 | 196篇 |
2017年 | 187篇 |
2016年 | 183篇 |
2015年 | 166篇 |
2014年 | 166篇 |
2013年 | 786篇 |
2012年 | 305篇 |
2011年 | 318篇 |
2010年 | 207篇 |
2009年 | 182篇 |
2008年 | 235篇 |
2007年 | 239篇 |
2006年 | 224篇 |
2005年 | 166篇 |
2004年 | 181篇 |
2003年 | 155篇 |
2002年 | 167篇 |
2001年 | 321篇 |
2000年 | 304篇 |
1999年 | 224篇 |
1998年 | 72篇 |
1997年 | 72篇 |
1996年 | 69篇 |
1992年 | 152篇 |
1991年 | 165篇 |
1990年 | 143篇 |
1989年 | 136篇 |
1988年 | 130篇 |
1987年 | 120篇 |
1986年 | 116篇 |
1985年 | 126篇 |
1984年 | 111篇 |
1983年 | 89篇 |
1981年 | 70篇 |
1980年 | 66篇 |
1979年 | 127篇 |
1978年 | 65篇 |
1976年 | 76篇 |
1975年 | 89篇 |
1974年 | 118篇 |
1973年 | 106篇 |
1972年 | 82篇 |
1971年 | 95篇 |
1970年 | 90篇 |
1969年 | 96篇 |
1968年 | 90篇 |
1967年 | 102篇 |
排序方式: 共有8877条查询结果,搜索用时 15 毫秒
131.
Farnaz Kaighobadi Jacob Shane Erika Y. Niwa Tanzina Ahmed Laura C. Reigada 《Social and Personality Psychology Compass》2023,17(8):e12790
COVID-19 vaccine concerns remain high among Americans. Although recent studies have investigated the sociodemographic disparities in vaccine concerns, less attention has been given to reasons for vaccine skepticism and psychosocial factors that may explain it. The current study examined specific types of vaccine concerns among a diverse sample of college students (N = 1985) living in New York City. Participants who identified as Black, younger, with later immigrant generational status, and those with more conservative political leanings reported more vaccine concerns. Concerns regarding vaccine side effects were the most frequently reported source of concern. Reason for getting vaccinated, personal experiences with COVID, and COVID stress was also associated with vaccine concerns. Study results emphasize the importance of sociodemographic factors and COVID knowledge and stress in examining and addressing vaccine concerns. 相似文献
132.
133.
John A. Rupf George W. Hughes Stephen V. Rowson Kenneth F. Ruder 《Behavior research methods》1972,4(1):11-12
A simple procedure by which a speech signal may be switched on or off (or from one ear to the other) at a precise instant of time is described. The speech sample is first recorded on a magnetic tape loop. A reference pulse is then recorded preceding the speech signal. This reference pulse triggers an adjustable time delay which in tum operates an electronic switch at an appropriate time. 相似文献
134.
In two separate experiments, 40 Ss were presented with recorded sentences during each of which a click occurred. Ss had to depress a key as soon as they heard the click. RTs were f aster when the click was located at the major syntactic break of the sentence compared with RTs to clicks not at a break. This confirmed the hypothesis that processing load is a function of the surface structure of sentences, although the role of minor breaks was not clear. A second finding was that RTs were slower when the click was in the first rather than in the second half of the sentence. This can also be explained in terms of differential processing loads. 相似文献
135.
136.
M. B. Sterman J. J. Lynch M. T. Orne D. Paskewitz J. Costello N. Nicolov O. Diankov M. Popova E. Tsvetanska Robert G. Grenell J. J. Izquierdo V. H. Mark Joseph Germana N. Zill William P. Paré Joseph E. O. Newton George C. Offutt Walter Ehrlich Joseph E. D. Newton Julij Tosef J. Perez-Cruet Chester R. Wilpizeski John F. Lontz Andrew Livingston Joseph W. Cullen Samuel A. Corson Herman R. Weed Elizabeth O. Corson O. D. Murphree Paul N. Morgan Ruth Jarman J. Antal T. A. Ban J. V. Ananth H. E. Lehmann A. Ulric Moore Richard H. Barnes Wilson G. Pond 《Integrative psychological & behavioral science》1970,5(3):185-193
137.
Pigeons were trained to depress a lever to avoid electric shock under free-operant avoidance schedules without a warning signal, or with a warning signal that could be terminated only by a response. Most birds in the signalled avoidance procedure terminated more than 50% of the warning signals before shock. In the unsignalled avoidance procedure, several birds formed a temporal discrimination and received relatively few shocks; other birds responded only in post-shock bursts, and received many more shocks. 相似文献
138.
WILLIAM V. MUSE 《Journal of counseling and development : JCD》1970,48(10):842-847
Seventy-two social fraternities were studied to discover some reasons for the variation in the degree of success attained by these student organizations on a college campus. The specific factors studied were management practices that could be employed by the groups. Analysis revealed a significant positive relationship between success as a fraternity and the use of certain management practices, and it identified several individual practices or characteristics highly associated with more successful groups. This article proposes that student organizations would find such practices influential in their future survival and success. 相似文献
139.
EDWARD V. DAUBNER EDITH SCHELL DAUBNER 《Journal of counseling and development : JCD》1970,48(6):433-442
Although some behavioral scientists and practitioners contend that man has no genuine moral choices to make, common sense and philosophical reflection ineluctably affirm the moral nature of man. When young people are faced with moral decisions, they often seek the assistance of a counselor. Although such counselors are routinely expected to aid clients in making decisions about their education and their careers, there is considerably less agreement about their responsibility for helping students to make moral choices. The central thesis of this article is that a knowledge of ethical theories, the practical principles which flow from them, and the method of decision-making which they indicate will enable the counselor to assist his clients with their moral problems. 相似文献
140.
ROBERT A. MACGUFFIE GARY Q. JORGENSEN FREDERICK V. JANZEN 《Journal of counseling and development : JCD》1970,48(8):653-656
The intent of this study was to determine the effects of a clients' need for approval on the outcomes of counseling. The expectation was that clients who have a high need for approval by others would cooperate more with the counseling process and would more often be successful in the sense of being rehabilitated. The Marlowe-Crowne Social Desirability Scale was administered to 167 applicants at a state rehabilitation agency immediately after the initial interview. It was hypothesized that successfully rehabilitated clients would obtain significantly higher social desirability scores than those clients who were not successful. The results confirmed the hypothesis at the .01 level of significance. 相似文献