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   1111篇
  免费   69篇
各国政治   88篇
工人农民   129篇
世界政治   105篇
外交国际关系   54篇
法律   548篇
中国共产党   1篇
中国政治   6篇
政治理论   247篇
综合类   2篇
  2024年   1篇
  2023年   11篇
  2022年   6篇
  2021年   13篇
  2020年   37篇
  2019年   49篇
  2018年   69篇
  2017年   67篇
  2016年   74篇
  2015年   37篇
  2014年   64篇
  2013年   185篇
  2012年   46篇
  2011年   48篇
  2010年   39篇
  2009年   46篇
  2008年   37篇
  2007年   38篇
  2006年   33篇
  2005年   39篇
  2004年   33篇
  2003年   37篇
  2002年   34篇
  2001年   10篇
  2000年   11篇
  1999年   3篇
  1998年   9篇
  1997年   8篇
  1996年   12篇
  1995年   11篇
  1994年   3篇
  1993年   7篇
  1992年   3篇
  1991年   8篇
  1990年   8篇
  1989年   5篇
  1988年   4篇
  1987年   8篇
  1986年   3篇
  1985年   3篇
  1984年   5篇
  1983年   2篇
  1981年   3篇
  1980年   3篇
  1979年   3篇
  1978年   2篇
  1976年   1篇
  1975年   1篇
  1974年   1篇
排序方式: 共有1180条查询结果,搜索用时 46 毫秒
51.
52.
53.
54.
55.
Eighth graders, 11th graders, and college sophomores wrote open-ended essays that characterized their own approaches to moral reasoning. Their essays were scored for the presence of various themes. Students also responded to three dilemmas from the Defining Issues Test (Rest, 1979). Students then rated their own use of justice and care orientations in moral reasoning, using a previously developed instrument (Ford and Lowery, 1986; Lyons, 1983). Characterizations of moral reasoning became more multifaceted and thorough with grade, and correlated with many traditional measures of moral reasoning. Males and females showed some, but relatively few, differences in characterizing their own moral reasoning, although females tended to respond more thoroughly to the open-ended task. Gender differences, when they occurred, were mostly found on measures that assessed so-called feminine issues or concerns, but not on traditional measures of moral reasoning. Characterizations of moral reasoning clustered into five dimensions, raising questions about the utility of the constructs of justice and care orientations.The first and third authors received financial support from a Ford-Mellon grant made to Carleton College. Results of this study were presented at the 1990 meeting of the Society for Research in Adolescence.Received Ph.D. in Psychology and M.S.E. in Computer and Information Sciences at the University of Pennsylvania, and has research interests in the development of reasoning skills, decision making, and conceptual development.Received Ph.D. in Counseling and Guidance from the University of Wisconsin, Madison, and has research interests in adolescent development and adolescent psychopathology.Received B.A. in Psychology from Carleton College in 1990. Has interests in adolescence and chemical dependence.  相似文献   
56.
The differences between male and female adolescents' emotional reactions to their most recent occasion of sexual intercourse were examined. The sample included 932 sexually active Australian secondary school students who completed a self-report questionnaire concerning their sexual behavior. The majority of young people reported that they felt happy or good following their most recent occasion of sex. Females were more likely than males to report negative emotions such as feeling bad and used, but there was no difference between the percentage of males and the percentage of females who reported feeling guilty. Girls were more likely to feel bad, used, or guilty last time if they were drunk/high or had sex with someone who was not a steady partner. Boys who had sex with someone other than a steady partner last time were more likely to feel guilty. Peer and parental influences were also associated with feelings of guilt. Girls who were more confident that they could talk to one of their parents/guardians about sex, and boys who believed that most of their peers were sexually active, were less likely to have felt guilty.Received B.A. (Hons) from University of Queensland. Research interests include adolescents mental and sexual health.Received B.A.(Hons) from University of Queensland. Interested in the areas of sex roles and sexual behavior among adolescents.Received Ph.D. from Murdoch University. Research interests include population studies of sexual behavior and mental health.Received M.B.B.S., M.D. from University of Sydney. Research interests include adolescent health, psychological response in disasters, coping with grief and loss and living with HIV/AIDS.  相似文献   
57.
The current study examined the nature and style of mother-adolescent conversations, how these conversations differ by subject matter, and dyadic and individual differences. Thirty-one mother-adolescent dyads (17 boys, 14 girls) with a child between the ages of 11 and 14 had a nonstructured conversation, and conversations about conflict and sexuality. They also completed questionnaires on beliefs about acquired immunodeficiency syndrome (AIDS). Conversations were measured for turn taking, total number of words, and conversational dominance, as well as nonverbal measures of affiliation, shame, and contempt. Conversations about sexuality involved less turn taking, fewer words, and more mother dominance than nonstructured conversations. Conversations about conflicts involved less turn taking but more words than nonstructured conversations. Some gender and age differences were found. More interactive conflict conversations contained higher levels of affiliation, and lower levels of child shame than conversations with fewer turns or higher mother dominance. In addition, children in more interactive dyads possessed a larger percentage of their mother's AIDS knowledge, and worried about AIDS a moderate amount.This research was supported by National Institutes of Child Health and Human Development Grant No. HD27035.Received M.A. from UCLA. Current research interests include parent-adolescent relationships, adolescent peer relations, and adolescent sexuality.Received Ph.D. from Rutgers, The State University of New Jersey. Major research interest is in parent-adolescent communication and emotional development.Received Ph.D. from Boston University. Major research interest is in parent-child affective communication.  相似文献   
58.
59.
A sensitive analytical method was developed for quantitative analysis of delta(9)-tetrahydrocannabinol (delta(9)-THC), 11-nor-delta(9)-tetrahydrocannabinol-carboxylic acid (delta(9)-THC-COOH), cannabinol (CBN) and cannabidiol (CBD) in human hair. The identification of delta(9)-THC-COOH in hair would document Cannabis use more effectively than the detection of parent drug (delta(9)-THC) which might have come from environmental exposure. Ketamine was added to hair samples as internal standard for CBN and CBD. Ketoprofen was added to hair samples as internal standard for the other compounds. Samples were hydrolyzed with beta-glucuronidase/arylsulfatase for 2h at 40 degrees C. After cooling, samples were extracted with a liquid-liquid extraction procedure (with chloroform/isopropyl alcohol, after alkalinization, and n-hexane/ethyl acetate, after acidification), which was developed in our laboratory. The extracts were analysed before and after derivatization with pentafluoropropionic anhydride (PFPA) and pentafluoropropanol (PFPOH) using a Hewlett Packard gas chromatographer/mass spectrometer detector, in electron impact mode (GC/MS-EI). Derivatized delta(9)-THC-COOH was also analysed using a Hewlett Packard gas chromatographer/mass spectrometer detector, in negative ion chemical ionization mode (GC/MS-NCI) using methane as the reagent gas. Responses were linear ranging from 0.10 to 5.00 ng/mg hair for delta(9)-THC and CBN, 0.10-10.00 ng/mg hair for CBD, 0.01-5.00 ng/mg for delta(9)-THC-COOH (r(2)>0.99). The intra-assay precisions ranged from <0.01 to 12.40%. Extraction recoveries ranged from 80.9 to 104.0% for delta(9)-THC, 85.9-100.0% for delta(9)-THC-COOH, 76.7-95.8% for CBN and 71.0-94.0% for CBD. The analytical method was applied to 87 human hair samples, obtained from individuals who testified in court of having committed drug related crimes. Quantification of delta(9)-THC-COOH using GC/MS-NCI was found to be more convenient than GC/MS-EI. The latter may give rise to false negatives due to the detection limit.  相似文献   
60.
Abstract. This article examines the interaction between individual characteristics and institutional incentives in non–voting, with a special focus on the interaction between these two types of explanatory variables. The analysis of survey and contextual data for parliamentary elections in 15 Western European countries shows that the effect of individual resources and motivations on abstention is not constant across different countries. Conversely, the effect of institutional incentives (compulsory voting, voting facilities, electoral thresholds of representation and preference expression) on non–voting depends on the elector's level of resources and motivations. One of the four institutional incentives considered has even opposite effects for citizens with different individual characteristics. The analysis also shows that when analysing interactions it is fundamental to distinguish between magnitudes and consequences of the effects of explanatory variables. This has important implications for the interpretation of the results of logistic regression analysis.  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