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   21872篇
  免费   867篇
  国内免费   11篇
  22750篇
  2019年   256篇
  2018年   375篇
  2017年   399篇
  2016年   418篇
  2015年   321篇
  2014年   354篇
  2013年   1747篇
  2012年   626篇
  2011年   646篇
  2010年   387篇
  2009年   366篇
  2008年   492篇
  2007年   550篇
  2006年   468篇
  2005年   443篇
  2004年   416篇
  2003年   410篇
  2002年   438篇
  2001年   744篇
  2000年   712篇
  1999年   540篇
  1998年   216篇
  1996年   220篇
  1995年   198篇
  1992年   449篇
  1991年   441篇
  1990年   427篇
  1989年   401篇
  1988年   419篇
  1987年   375篇
  1986年   388篇
  1985年   390篇
  1984年   306篇
  1983年   275篇
  1982年   203篇
  1981年   205篇
  1979年   349篇
  1978年   253篇
  1977年   213篇
  1976年   198篇
  1975年   279篇
  1974年   355篇
  1973年   367篇
  1972年   290篇
  1971年   284篇
  1970年   282篇
  1969年   251篇
  1968年   349篇
  1967年   307篇
  1966年   284篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
We interviewed a sample of 317 married women prior to a tubal sterilization (195) or a husband's vasectomy (122) and then reinterviewed them yearly for 5 years. Using these women's responses to six questions about their feelings and desires following sterilization, we fitted a latent-variable model of post-sterilization regret to the data by means of a linear structural equation analysis. The results confirmed our view that post-sterilization regret was not a simple psychological state but rather was a complex process with different, causally linked manifestations. This process began with a renewed interest in having a baby, proceeded to the development of negative feeling about the three decisions that lead to sterilization, and concluded with a desire to reverse the surgery. This sequence was affected by the negative, post-sterilization effects of the sterilization and by the Occurrence of divorce. Next, we identified the pre-sterilization predictors of six regret variables from our model by means of a series of linear regression analyses. The major pre-sterilization predictors of the regret process included being relatively young, ambivalence about future childbearing, negative attitudes toward sterilization, dominance of the decision making by the woman's husband, and conflict with her husband during decision making. Finally, we divided the sample into quintiles on the basis of their scores on a Pre-Sterilization Predictor Scale and assessed the performance of our predictor variables as indicators of risk of regret by determining the level of negative feelings toward sterilization in each quintile. The results confirm the discriminatory power of our predictors. The overall findings indicate a number of psychological and marital issues, the exploration of which might help counselors provide anticipatory and preventative services to couples seeking sterilization.  相似文献   
912.
Social influence processes affecting adolescent substance use   总被引:14,自引:0,他引:14  
Social influence is central to models of adolescent substance use. Nonetheless, researchers fail to delineate the various forms of social influence. A framework that distinguishes between active (explicit drug offers) and passive (social modeling and overestimation of friends' use) social pressure was tested. The effect of these processes on alcohol and cigarette use was examined with 526 seventh graders taking part in an alcohol prevention program. Hierarchical regression analyses demonstrated that pretest measures of alcohol use, offers, modeling, and overestimation each accounted for unique variance in posttest alcohol use. Similar results were obtained for cigarette smoking. The general model was not significantly different for boys and girls, or for prior users and prior nonusers, supporting the generalizability of the framework. Implications for intervention programs are discussed.  相似文献   
913.
914.
Twenty teachers each taught a male and a female student two different lessons. One of these lessons was in a stereotypically masculine domain (mechanics), the other in a stereotypically feminine domain (vocabulary). Judges viewed clips from the videotaped lessons and rated teachers' nonverbal behaviors. The students also rated their teachers on a variety of behavioral dimensions. The results showed that teachers exhibited more positive behavior toward the students for whose gender the material being taught was stereotypically appropriate. Similarly, teachers exhibited more negative behavior toward those students for whose gender the material being taught was considered stereotypically inappropriate. Additionally, teacher gender was shown to interact with the above-mentioned biased teaching behavior. Generally speaking, women teachers behaved in a less gender-biased way than did men teachers. It is suggested that these kinds of differential teaching behaviors may contribute to the differential performance of male and female students in traditionally gender-stereotyped academic domains.  相似文献   
915.
Children have difficulty learning to read alphabetic writing systems, in part, because they have difficulty segmenting spoken language into phonemes. Young children also have difficulty attending to the individual dimensions of visual objects. Thus, children's early difficulty in reading may be one sign of a general inability to selectively attend to the parts of any perceptual wholes. To explore this notion, children in kindergarten through fourth grade (Experiments 1, 3, and 4) and adults (Experiment 2) classified triads of spoken syllables and triads of visual objects. Classifying speech by common parts was positively related to reading and spelling ability (Experiments 1 and 4), but usually not to classifying visual stimuli by common parts under free classification instructions (Experiments 1 through 3). However, classification was more consistent across the visual and auditory modalities when the children were told to classify based on a shared constituent (Experiment 4). Regardless of instructions, performance on the visual tasks did not usually relate to reading and spelling skill. The ability to attend selectively to phonemes seems to be a "special" skill--one which may require specific experiences with language, such as those involved in learning to read an alphabetic writing system.  相似文献   
916.
Speed of word identification is important in the theories of reading proposed by La Berge and Samuels (1974) and Perfetti (1985), and is substantially correlated with reading skill. However, there is controversy about whether disabled readers have a speed deficit that is restricted to the identification of printed words, or if instead, they have a more general speed deficit in retrieving names of even single digits. To investigate this issue, poor and average readers (N = 43) in grade 2 were assessed on several indices of speed of digit and letter naming, using both continuous-list and discrete-trial methodologies. MANCOVA indicated clear effects of reader group on discrete-trial latencies, as well as an interaction between reader group and the speed with which to-be-named items were presented. A series of hierarchical regression analyses explored the amount of shared variance between various measures of digit naming speed and five indices of reading skill. Latency for word identification shares considerable variance with latency for digit naming, and, in general, accounts for the shared variance of naming speed and several other measures of reading skill. Naming speed contributed variance in reading skill. Naming speed contributed variance in reading skill independently of measures of phonological awareness.  相似文献   
917.
The purpose of this investigation was to explore sex and race discrimination in employment at the managerial level, with special focus on Black women.  相似文献   
918.
919.
Masculinity (M) and femininity (F) were related to multiple dimensions of self-concept in 2 large studies. Androgyny theory predicts that M and F contribute positively to self-concept, but the effect of F has been nil in research using global self measures. Here, consistent with the new differentiated additive model, the relative contribution of M and F varied substantially, depending on the area of self-concept; F contributed more positively to self-concept facets that were more stereotypically feminine. Support for the model was consistent across self-responses and responses by significant others (Study 1) and across 5 age groups in early-to-middle adolescence (Study 2).  相似文献   
920.
The role of coping success on psychosocial distress was investigated in 147 older adults who experienced a major health problem and 82 older adults who reported a major loss in the past 6 months. Home interviews provided data on satisfaction with coping efforts and negative changes associated with events. Significant predictors of coping success were identified and controlled for in subsequent analyses predicting mental health. Efficacy in coping with loss was associated with less psychological distress. Coping efficacy interacted with coping efforts in predicting distress for those with health downturns; efficacy in coping was associated with less distress only for those who were actively engaged in coping. Analyses of longitudinal data replicated the cross-sectional findings for coping with loss.  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