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   2636篇
  免费   73篇
  国内免费   2篇
  2711篇
  2018年   35篇
  2017年   46篇
  2016年   54篇
  2015年   29篇
  2014年   36篇
  2013年   318篇
  2012年   73篇
  2011年   77篇
  2010年   45篇
  2009年   52篇
  2008年   67篇
  2007年   65篇
  2006年   73篇
  2005年   84篇
  2004年   70篇
  2003年   73篇
  2002年   68篇
  2001年   35篇
  2000年   30篇
  1999年   45篇
  1998年   55篇
  1997年   37篇
  1996年   42篇
  1995年   36篇
  1994年   35篇
  1993年   36篇
  1992年   31篇
  1991年   37篇
  1990年   34篇
  1989年   44篇
  1988年   35篇
  1987年   32篇
  1986年   30篇
  1985年   25篇
  1984年   43篇
  1983年   35篇
  1982年   47篇
  1981年   37篇
  1980年   41篇
  1979年   42篇
  1978年   45篇
  1977年   36篇
  1976年   39篇
  1975年   34篇
  1974年   43篇
  1973年   36篇
  1971年   26篇
  1969年   33篇
  1968年   26篇
  1967年   25篇
排序方式: 共有2711条查询结果,搜索用时 15 毫秒
991.
992.
This paper introduces the notion of syntactic feature to provide a unified treatment of earlier model theoretic proofs of both the compactness and interpolation theorems for a variety of two valued logics including sentential logic, first order logic, and a family of modal sentential logic includingM,B,S 4 andS 5. The compactness papers focused on providing a proof of the consequence formulation which exhibited the appropriate finite subset. A unified presentation of these proofs is given by isolating their essential feature and presenting it as an abstract principle about syntactic features. The interpolation papers focused on exhibiting the interpolant. A unified presentation of these proofs is given by isolating their essential feature and presenting it as a second abstract principle about syntactic features. This second principle reduces the problem of exhibiting the interpolant to that of establishing the existence of a family of syntactic features satisfying certain conditions. The existence of such features is established for a variety of logics (including those mentioned above) by purely combinatorial arguments.Presented byMelvin Fitting  相似文献   
993.
Recently there has been concern over the need for mental health research within ethnic minority populations, particularly Hispanic populations. Although there has been research focusing upon the similarity of mental health problems among Hispanic and Anglo-American samples, the absence of information regarding the cross-ethnic measurement equivalence of the assessment tools used in these comparisons seriously limits the interpretability of these findings. The two reported studies were designed to (a) examine the cross-ethnic functional and scalar equivalence of several mental health measures by examining the interrelations of these mental health indicators and examining the regression equations using negative life events to predict mental health outcomes; and (b) compare several mental health indicators among Hispanic and Anglo-American 8- to 14-year-old children. Findings suggest considerable cross-ethnic functional and scalar equivalence for the measure of depression, conduct disorders, and negative life events. In addition, findings indicate that the Hispanic children scored higher in depression than did the Anglo-American children, but this difference could be a function of differences in SES. The reader is cautioned that the present samples included only English-speaking and primarily Mexican American children. This study was funded by the National Institute for Mental Health Grant 2-P50-MH39246-06 to support the Preventive Intervention Research Center at Arizona State University. The authors gratefully acknowledge the contributions made by Tim Ayers, Carolyn Berg, Leah Gensheimer, Joanne Gersten, Nancy Groppenbacher, Lisa Jack, Lillian Lengua, Marcia Michaels, Irwin Sandler, and Jerome Short.  相似文献   
994.
995.
In spite of the fact that it is required only occasionally for sanitary reasons and not legally mandatory, the practice of embalming is widespread in contemporary American society. This study explores the historical, cultural and psychological factors which gave rise to the practice of embalming and why the practice continues. Two case studies are presented in which delayed grief reactions were present; linkages with embalming are described. It is suggested that the frightening finitude of the self and a fear of death in modern society have led to practices in which the corpse is viewed as looking “natural,” thus denying the reality of death. Embalming is seen as the final assault on the self, which can also carry with it problematic psychological consequences for the survivors.  相似文献   
996.
997.
Two years of office referral data are presented in evaluation of a school-wide behavioral support program designed to define, teach, and reward appropriate student behavior in a rural middle school (grades 6, 7, and 8). During 1994-95, the school had 530 students and recorded 2,628 office referrals. The 1995-96 school year began with a full day in which students were taught five school expectations. Throughout the year, students also received rewards for appropriate behavior and office referrals for infractions. Results during 1995-96 document a 42% reduction in office referrals from the previous year. While the evaluation results do not document functional relationship, they suggest an efficient process for evaluating school-wide behavioral support, teaching appropriate behaviors, and changing the overall climate of the school. Implications for future research, and the use of schools as a unit of analysis, are discussed.  相似文献   
998.
Observers infer more sexual availability and willingness from a drinking dater. We hypothesized that, as dosage rises, these sexual inferences follow a linear pattern. College participants rated a woman (Study 1) and man (Study 2) exhibiting a sober, moderate, or high level of intoxication while with a light-drinking companion. Alcohol was perceived as having linear effects on sexual availability; and, except for male participants in Study 2, alcohol was perceived as having linear effects on willingness. Thus, with rising intoxication and diminished capacity for arousal, drinkers are perceived as more available and willing. Findings are discussed relative to expectancy models of sexuality. Reasons for desynchrony between alcohol's actual supression of sexual arousal and its perceived enhancement of willingness are presented.  相似文献   
999.
This study tested the proposition that the success of an intelligent female in the third world is attributed more to ability and less to nonability factors than the success of her male counterpart. To this end, subjects from developing nations attributed the success of an American or third world male or female of average or high intelligence to ability, effort, luck, and task ease. Results indicated that subjects attributed the success of the intelligent third world female more to ability and less to luck than the success of the comparable male. In addition, gender differences were found which indicated that under some circumstances the success of the female more than that of the male is attributed to task ease.  相似文献   
1000.
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