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   22109篇
  免费   897篇
  国内免费   5篇
各国政治   966篇
工人农民   900篇
世界政治   1498篇
外交国际关系   748篇
法律   14387篇
中国共产党   6篇
中国政治   182篇
政治理论   4124篇
综合类   200篇
  2020年   341篇
  2019年   394篇
  2018年   465篇
  2017年   554篇
  2016年   564篇
  2015年   446篇
  2014年   441篇
  2013年   2127篇
  2012年   567篇
  2011年   614篇
  2010年   547篇
  2009年   574篇
  2008年   625篇
  2007年   655篇
  2006年   642篇
  2005年   589篇
  2004年   599篇
  2003年   611篇
  2002年   536篇
  2001年   889篇
  2000年   722篇
  1999年   646篇
  1998年   333篇
  1997年   224篇
  1996年   262篇
  1995年   235篇
  1994年   270篇
  1993年   271篇
  1992年   442篇
  1991年   472篇
  1990年   458篇
  1989年   406篇
  1988年   416篇
  1987年   387篇
  1986年   423篇
  1985年   395篇
  1984年   315篇
  1983年   317篇
  1982年   248篇
  1981年   258篇
  1980年   173篇
  1979年   271篇
  1978年   189篇
  1977年   154篇
  1976年   140篇
  1975年   166篇
  1974年   177篇
  1973年   153篇
  1972年   136篇
  1969年   128篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
982.
983.
984.
985.
We conducted a short-term longitudinal study examining the structure of coping behavior and the relationship between coping style and depression during adolescence. The sample consisted of 603 adolescents in Grades 6–11 who were surveyed in the fall of 1989 and again in the fall of 1990. A two-dimensional model of coping was found using confirmatory factor analysis with the factors being approach and avoidant coping. Four cross-sectional and seven longitudinal coping groups were formed to explore group differences in depression. Approach copers reported the fewest symptoms of depression, while avoidant copers reported the most. Subjects who changed over time from approach to avoidant coping evidenced a significant increase in depressive symptoms, whereas subjects who switched from avoidant to approach coping displayed a significant decrease in depression over a one-year period. These findings imply that adolescents who are able to elicit social support, engage in problem solving, and cognitively restructure events within a positive light are more likely to successfully negotiate the challenges of adolescence.This research was supported by a grant from the William T. Grant Foundation (8912789), Anne C. Petersen, Principal Investigator. The writing of this article was supported by the National Institute of Mental Health Research Training Grant 5 T32MH18387-06 in Child Mental Health/Primary Prevention.Received Ph.D. in Human Development and Family Studies from Pennsylvania State University. Research interests include adolescent mental health and community research.Received his Ph.D. in Human Development and Family Studies from Pennsylvania State University. Research interests include adolescent mental health and research methodology.Received degree from the University of Chicago. Research interests are in biopsychosocial development in adolescence, with a focus on sex differences in mental health.  相似文献   
986.
Elements of this article first appeared in a paper given at the Hart Conference on Property, 1993.  相似文献   
987.
Explored the influence of life stress as mediated or moderated by locus of control, family environment, social support, and coping style on psychological adjustment and school performance in 164 ninth graders from Baltimore. Gender differences in findings were shown. For boys, family cohesion was the only variable found to protect against the effects of stress. Family cohesion did not serve protective functions for girls, and along with overall social support, was associated with increased vulnerability to school problems. The report of problem-focused coping strategies exerted a number of protective functions for girls only. External locus of control was found to increase boys' and girls' vulnerability to the effects of life stress. Empirical development of interventions to improve the psychosocial adjustment of inner-city adolescents is discussed.Received Ph.D. from Virginia Polytechnic Institute and State University in 1991. Research interests include evaluation of school mental health services, empirical development of interventions for children, and the impact of violence on urban youth.Received B.A. from Cornell University. Interests include stress and coping in children, identification of resilience factors, and evaluation of child mental health systems of care.Received Ph.D. from the University of Oklahoma in 1967. Research interests include psychophysiology, sleep disorders, and biofeedback and instrumentation.Received B.A. from Loyola College. Interested in applied work with adolescents and adults.Received M.D. from Duke University in 1968. Research interests include training in child and adolescent psychiatry, adolescent psychopathology, and the development of school mental health programs.  相似文献   
988.
Abstract: Understanding the proper role of government in the promotion of small technology-oriented firms is a priority given the potential benefits to society as a whole and the inability of traditional market mechanisms to adequately nurture such firms. Further, designing the appropriate public policies to sufficiently satisfy the involved stakeholders has typically proven to be an elusive pursuit. With these issues in mind, this paper applies the concept of agency theory to evaluate government programs seeking to promote technology start-ups. A new program associated with the Innovation Ontario Corporation, which utilizes equity joint ventures between government and small technology-oriented firms, is described and evaluated using the agency perspective. Suggestions are made for further inquiry and analysis. Sommaire: Il importe de cerner le rôle adéquat du gouvernement dans la promotion des petites entreprises technologiques, étant donné, d'une part, les avantages potentiels pour la société dans son ensemble, et d'autre part, l'incapacité des mécanismes classiques du marchéà favoriser comme il le faut l'évolution de ces entreprises. De plus, en régle générale, les efforts visant àélaborer des politiques publiques appropriées et satisfaisantes pour les intervenants en question se sont révélés aléatoires. Compte tenu de tout cela, le présent article applique la théorie des agences pour évaluer les programmes gouvemementaux qui visent à faciliter le démarrage d'entreprises technologiques. Nous décrivons et nous évaluons ici, dans la perspective des agences, un nouveau programme associéà la Société Innovation Ontario, qui fait appel aux co-entreprises avec participation au capital pour le gouvernement et les petites entreprises technologiques. Nous proposons aussi des suggestions pour des enquêtes et analyses plus poussées.  相似文献   
989.
Book review     
  相似文献   
990.
Federalism, as a concept and as a reality, received assistancefrom a variety of sources during 1994–1995. Opinion pollsrevealed a public strongly supportive of shifts in the balanceof power between federal and state governments. The new Republican-controlledCongress, bent on devolving authority to the states, busieditself with an ambitious legislative agenda. The DemocraticPresident pursued his principles of federalism and intergovernmentalrelations by supporting the unfunded mandates bill and by increasingthe use of the administrative waiver. The U.S. Supreme Courtbolstered federalism with its rulings in cases such as Lopez,a state challenge to the federal Gun-Free School Zones Act.The new mood in Washington, D.C. was complemented by state leadersanxious to take on the challenges of a rebalanced federal system  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