首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   44778篇
  免费   1939篇
  国内免费   31篇
  2020年   496篇
  2019年   583篇
  2018年   832篇
  2017年   786篇
  2016年   885篇
  2015年   610篇
  2014年   763篇
  2013年   3429篇
  2012年   1437篇
  2011年   1387篇
  2010年   868篇
  2009年   907篇
  2008年   1199篇
  2007年   1233篇
  2006年   1096篇
  2005年   983篇
  2004年   935篇
  2003年   837篇
  2002年   885篇
  2001年   1598篇
  2000年   1598篇
  1999年   1163篇
  1998年   473篇
  1997年   450篇
  1995年   435篇
  1992年   931篇
  1991年   876篇
  1990年   877篇
  1989年   797篇
  1988年   777篇
  1987年   724篇
  1986年   701篇
  1985年   751篇
  1984年   635篇
  1983年   583篇
  1982年   448篇
  1979年   667篇
  1978年   481篇
  1977年   439篇
  1976年   435篇
  1975年   530篇
  1974年   644篇
  1973年   671篇
  1972年   554篇
  1971年   506篇
  1970年   448篇
  1969年   491篇
  1968年   597篇
  1967年   536篇
  1966年   491篇
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
851.
Earlier studies have shown the girls spend more time than boys in activities that are highly structured by adults. Structured activities may encourage feminine sex-typed behaviors such as compliance to adults; low-structure activities may encourage masculine sex-typed behaviors such as independence and assertiveness. In the present study the effects of high or low levels of adult structuring on children's social behavior during preschool free-play activities were tested in a field experiment carried out during an entire semester in one preschool classroom. For the first 15 minutes of free play, children were assigned to high- or low-structure activities. As predicted, when children were in high-structure activities, they exhibited high rates of bids for recognition and compliance to adults; in low-structure activities, they exhibited peer-directed leadership, bids for recognition, and compliance. There were no generalized effects of these treatments on their subsequent free choice of activities or social behavior. The study demonstrates powerful effects of naturally occurring variations in children's play activities on sex-typed social behaviors.  相似文献   
852.
853.
San Diego suicide study: comparison of gay to straight males   总被引:1,自引:0,他引:1  
Previous large studies of completed suicides have not considered sexual orientation in their data analyses. In this study, data from the known homosexual subpopulation (13 males, aged 21-42) in a series of 283 suicides were examined. They were compared with all other aged male suicides 21-42 (n = 106). Both groups showed considerable substance abuse plus a variety of other psychiatric diagnoses. Both also had a high frequency of relationship difficulties near the time of death. Gays who committed suicide did not have a history of more police trouble and were no more likely to be living alone than the comparison group. They did not have more prior suicide attempts or previous psychiatric treatment. We conclude that, among the factors examined here, there appears to be little difference between gay and heterosexual male suicides.  相似文献   
854.
Younger adult students between 19 and 24 years of age (M = 21.3 years), older adult students between 61 and 76 years of age (M = 67.9 years), and older adult nonstudents between 62 and 76 years of age (M = 68.5 years) were assessed for health (self-ratings of physical and mental health), social functioning (self-ratings of physical and mental activity, perceived role activity level, perceived roles, locus of control, and age-norm expectations), and cognitive functioning (Wechsler Adult Intelligence Scale-Revised vocabulary and block design, and paired associate memory). Age differences were observed in self-ratings of health, social roles, intellectual performance, and memory. No student status differences were observed. The results are discussed in terms of plasticity of intellectual function and characteristics of student status in later adulthood.  相似文献   
855.
Age-related differences in the pleasantness of chemosensory stimuli   总被引:2,自引:0,他引:2  
Modest decrements in both taste threshold sensitivity and, more recently, suprathreshold sensitivity have been associated with the aging process. The present study was designed to investigate the existence of changes in preference for various concentrations of single tastes and of the same single tastes in more complex chemosensory mixtures. In this study, 300 participants from three different age groups (18-26, 32-45, over 65) rated for pleasantness four concentrations of sodium chloride, sucrose, and citric acid presented in both aqueous and beverage bases. Results showed significant effects of age, stimulus background, stimulus, concentration, and of several interactions, and they suggest that elderly subjects find salt and sugar pleasanter at higher concentrations than younger subjects do.  相似文献   
856.
857.
Short scales were developed to measure three broad dimensions of personality in the National Health and Nutrition Examination Survey (NHANES I) Epidemiologic Followup Study. Items to measure neuroticism were selected rationally from the General Well-Being Schedule, and items to measure extraversion and openness to experience were selected by multiple regression from the NEO Personality Inventory. In a sample of 654 men and women from the Augmented Baltimore Longitudinal Study of Aging, all three short scales showed clear evidence of convergent and discriminant validity against full scales in self-reports, and against peer and spouse ratings. Because they were developed and validated on a sample with a comparable age range, the NHANES scales should be useful in examining age trends in these three personality dimensions in a national sample.  相似文献   
858.
Young students, old students, and old nonstudents read and recalled short texts that were in either narrative or expository form. In addition, a set of six verbal ability measures thought to be related to discourse memory was obtained for all of the participants. Older subjects recalled less from the texts than younger subjects, and neither type of text nor student status modified the magnitude of the age differences. The set of verbal ability measures was adequately described by two principal components, one consisting of simple, speed-related skills, and the other consisting of more complex skills. Each set of variables predicted a proportion of discourse memory variance, and accounted for some of the variance that would otherwise be attributed to age. The results suggest that age differences in some basic cognitive skills related to reading effectiveness might underlie age differences in memory for discourse.  相似文献   
859.
When presented with a behavioral problem or symptom expression that involves two systems, such as a serious school-related problem, the therapist needs to design an approach that will intervene effectively and expeditiously in both systems. This paper offers a guide to stages of problem escalation and therapeutic intervention that is intended to aid the problem-solver's thinking processes in approaching a troubled situation that involves two systems, the school and the home.  相似文献   
860.
Cast of Characters Work conceives of the personality as a naturally organized unique group of characters who, together, function in an internal system. All characters bring their own histories, perceptions, feelings, beliefs, and behaviors to life's situations. Their survival strategies and interrelationships are felt as anxiety, conflict, ambivalence, or confidence. Heightening awareness of these multiple, simultaneous events increases access to the actual living process. The complex inner world of individuals, couples, and families can be precisely explored by working directly with each character and their relationships. Objectives are accountability and more functional, flexible, and satisfactory arrangements among characters internally and in couples and families.Also in private practice at 2 Pine Circle, Urbana, IL 61801.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号