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   23035篇
  免费   1351篇
各国政治   984篇
工人农民   1018篇
世界政治   1549篇
外交国际关系   748篇
法律   15688篇
中国共产党   2篇
中国政治   137篇
政治理论   4134篇
综合类   126篇
  2021年   117篇
  2020年   502篇
  2019年   534篇
  2018年   679篇
  2017年   705篇
  2016年   782篇
  2015年   628篇
  2014年   640篇
  2013年   2398篇
  2012年   603篇
  2011年   645篇
  2010年   662篇
  2009年   695篇
  2008年   646篇
  2007年   630篇
  2006年   651篇
  2005年   572篇
  2004年   570篇
  2003年   480篇
  2002年   516篇
  2001年   883篇
  2000年   773篇
  1999年   641篇
  1998年   326篇
  1997年   229篇
  1996年   250篇
  1995年   259篇
  1994年   245篇
  1993年   250篇
  1992年   436篇
  1991年   430篇
  1990年   413篇
  1989年   410篇
  1988年   407篇
  1987年   379篇
  1986年   423篇
  1985年   428篇
  1984年   336篇
  1983年   319篇
  1982年   249篇
  1981年   221篇
  1980年   189篇
  1979年   307篇
  1978年   172篇
  1977年   144篇
  1976年   121篇
  1975年   139篇
  1974年   169篇
  1973年   129篇
  1972年   115篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
This prospective study examined the usefulness of seven selected variables from Jessor and Jessor's problem behavior theory in predicting the future smoking levels of adolescent experimental smokers. Experimental smokers were identified through a survey of 2,550 seventh- and eighth-grade students assessing subjects' current smoking levels as well as subjects' responses to the selected variables. Twelve months later the entire sample was resurveyed to assess subsequent smoking levels of subjects initially reporting experimental smoking. Experimental smokers who responded to both surveys (n=225) were subjects of the present study. The full model discriminant function was significant in discriminating between the two groups; 68% of the subjects were correctly classified. This moderately successful hit rate was 24% better than what could be expected by chance. Increased smokers had lower expectations for academic achievement, had stronger beliefs about the positive functions of smoking, and perceived more smoking among their classmates and close friends. Educational interventions are suggested.Received Ph.D. from the University of Nebraska in 1987. Research interests include human behavior change strategies.Received Ph.D. from University of Illinois in 1968. Research interests include behavior and health.  相似文献   
902.
903.
904.
The stepping-stone theory of progression into drug use is examined, based on the alcohol and other drug use of over 27,000 seventh-through eighth-grade students in New York State. The data show that students do not use illicit drugs unless they also use alcohol. White, black and Hispanic students all tend to initiate the use of drugs in the following order-alcohol, marijuana, pills, and hard drugs. Among blacks and Hispanics, pills are not as important a transition between marijuana and hard drugs as they are among whites. Cigarettes form an important step between alcohol and marijuana use for younger students, particularly for females. Since alcohol serves as the gateway to all other drug use, prevention approaches that control and limit alcohol use among adolescents may be warranted.He received his Ph. D. in Psychology for the State University of New York at Buffalo in 1976. His research interests are the social and psychological correlates of drinking.She received her Ph.D. in Sociology from the State University of New York at Buffalo in 1983.  相似文献   
905.
This study examined the influence of pubertal timing upon family interactions in normal and psychiatric adolescent samples. An important feature of our approach is its emphasis upon micro-analysis of family behaviors (individual speeches) and family processes (theoretically specified speech pairings). Rather than assume that global family patterns (e.g., power) shift in response to pubertal changes, we follow how types of speeches and speech sequences are associated with different pubertal timing. Using the previously constructed family coding system, the Constrainig and Enabling Coding System, we found that on-time adolescents and their parents differed from both off-time groups (early or late). These results are discussed in terms of current implications and suggestions for future research.An earlier version of this paper was presented at the SRCD Study Group on Timing of Maturation, October, 1983, at the Education Testing Service, Princeton, NJ. This research was supported by NICHD Grant 1 R01 HD18684-01, and an NIMH Research Scientist Award (Dr. Hauser).Received his Ph.D. from Harvard University. Research interest is adolescent development within the family and impact of chronic illness on adolescent development and family interaction.Received her B.A. from Wellesley College. Research interests are in humor and attractiveness.Received his M.A. from Boston University. Research interests are in methodology and statistics.Received Ed.D. from Harvard University. Research interests are in adolescent development within the family, and family coping with stress.Received M.D. from University of Chicago. Research interests are in psychosocial aspects of diabetes.Received Ed.D. from Harvard University. Research interests are in developmental psychopathology, and moral and ego development.Received Ph.D. from Ohio State University. Research interests are in assessment of ego development and family systems.Received Ph.D. from University of Miami. Research interests are in family studies and adolescent development.  相似文献   
906.
907.
908.
Eva K. Dargyay and Ulrich Grüber, Ladakh, Innenansicht eines Landes. Düsseldorf/Cologne: Diederichs, 1980. 300 pp, colour photographs, bibliography, glossary, chronological table, index.

Heinrich Harrer, Ladakh, Götter und Menschen hinterm Himalaya. Innsbruck: Pinguin, 1983. 172 pp, photographs, end paper maps, bibliography.

Andrew Harvey, A Journey in Ladakh. Boston: Houghton Mifflin, 1983. 236 pp., end paper maps, $13.95.

E. Joldan, Harvest Festival of Buddhist Dards of Ladakh and Other Essays. Srinagar: Kapoor Brothers, 1985. 104 pp., photographs, Rs. 30.

Detlef Kantowsky and Reinhard Sander, (editors), Recent Research on Ladakh: History, Culture, Sociology, Ecology. Munich, Cologne and London: Weltforum, 1983. 282 pp., photographs, diagrams, bibliography, DM 59.

Anneliese Keilhauer and Peter Keilhauer, Ladakh und Zanskar, Lamaistische Klosterkultur im Land zwischen Indien und Tibet. Cologne: DuMour, 1982. 414 pp., maps, diagrams, chronological chart, photographs, index, DM 36.

Sanyukta Koshal, Ladakhi Grammar. Delhi: Mortilal Banarsidass, 1979. 338 pp., index, Rs. 103.

Michel Peissel, Zanskar, the Hidden Kingdom. London: Collins, 1979. 205 pp., maps, photographs, index.

Janet Rizvi, Ladakh, Crossroads of High Asia. Delhi: Oxford University Press, 1983. 224 pp., photographs, glossary, bibliography, end‐paper maps, Rs 140.

Margaret Schettler and Rolf Schettler, Kashmir, Ladakh and Zanskar: A Travel Survival Kit. South Yarra, Victoria, Australia/Berkeley, CA, USA, 1984.203 pp., maps, diagrams, photographs, index, $7.95.  相似文献   

909.
In order to assess the relationship between family members' cognitive and affective responses to nuclear war issues, 317 college students and their parents (n=559) independently completed a multifaceted questionnaire that included items concerning personal reactions, predictions, opinions, and attitudes about nuclear war. Results revealed a negligible relationship between the responses of college students and their parents, although the level of concordance between mothers and fathers was somewhat greater. Moreover, parents and students were relatively poor at predicting each others' nuclear threat attitudes, and the strength with which an attitude was endorsed did not enhance its predictability. Results are discussed with regard to heterogeneity in attitudinal and affective reactions within families, and with regard to the idea that infrequent communication concerning nuclear war issues may be occurring.Portions of this article were presented at the meeting of the American Psychological Association, Los Angeles, California, August 25, 1985.Interested in clinical and counseling psychology, the psychological effects of the threat of nuclear war, and parent training.Interested in counseling psychology, nuclear war issues, and the concept-specific measurement of emotionality.Interested in counseling psychology, nuclear war issues, and factors influencing custody decisions.  相似文献   
910.
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