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   5520篇
  免费   190篇
各国政治   289篇
工人农民   199篇
世界政治   339篇
外交国际关系   227篇
法律   3597篇
中国政治   41篇
政治理论   1005篇
综合类   13篇
  2023年   29篇
  2022年   36篇
  2021年   47篇
  2020年   92篇
  2019年   96篇
  2018年   158篇
  2017年   173篇
  2016年   162篇
  2015年   139篇
  2014年   142篇
  2013年   536篇
  2012年   214篇
  2011年   211篇
  2010年   143篇
  2009年   163篇
  2008年   188篇
  2007年   176篇
  2006年   159篇
  2005年   133篇
  2004年   133篇
  2003年   134篇
  2002年   148篇
  2001年   216篇
  2000年   172篇
  1999年   126篇
  1998年   50篇
  1997年   61篇
  1996年   49篇
  1995年   61篇
  1994年   50篇
  1993年   59篇
  1992年   89篇
  1991年   90篇
  1990年   84篇
  1989年   69篇
  1988年   86篇
  1987年   85篇
  1986年   103篇
  1985年   110篇
  1984年   93篇
  1983年   89篇
  1982年   46篇
  1981年   44篇
  1979年   40篇
  1978年   43篇
  1975年   31篇
  1974年   45篇
  1971年   31篇
  1970年   31篇
  1968年   32篇
排序方式: 共有5710条查询结果,搜索用时 31 毫秒
981.
In 2009 cutoff values of assessment criteria to testify abstinence control in order to estimate driving ability were standardized in Germany. The cutoff values are lower than required in existing guidelines like SAMHSA and there is critical discussion about detection of low concentrations by using immunoassay, especially concerning amphetamines in urine (50 ng/ml). In this study Direct ELISA kits were tested for their applicability to identify the absence of amphetamines, cannabinoids, opiates, cocaine, methadone and benzodiazepines in urine. Results were confirmed by LC/MS or GC/MS analyses. Sensitivity, specificity, predictive values (positive as well as negative) and overall misclassification rates were evaluated by contingency tables and were compared to ROC-analyses. Sensitivity results as well as specificity results were satisfying showing sensitivity values higher than 96% for each analyte. The amphetamine test we used showed sensitivity and specificity of 100% and 88%, respectively, even if amphetamine tests usually react with high cross-reactivity. Our study results include high discrimination at required cutoff values between positives and negatives for each drug group and demonstrate that immunological tests complying with requirements of current decreased urine cutoff values for assessment of driving ability do exist.  相似文献   
982.
Parental dissatisfaction with children appears to be associated with child maltreatment. However, little is known regarding the specific domains of parental dissatisfaction that may increase child maltreatment potential, particularly in perpetrators of child maltreatment where substance abuse is present. In this study, responses to the Child Abuse Potential Inventory (CAPI) and a scale measuring parental satisfaction in 11 domains were examined in a sample of 82 mothers who were referred for treatment of substance abuse and child neglect by the local child protective service agency. Results indicated that mothers were relatively most satisfied with their children overall, and least satisfied in domains that were relevant to discipline (i.e., following house rules, compliance, reaction to redirection and punishment, completion of chores). Five of the 11 areas of parental satisfaction that were assessed evidenced negative correlations with child abuse potential, indicating that as satisfaction increased, abuse potential decreased. However, when correlation analyses excluded participants with elevated CAPI Lie scale scores (a measure of social desirability), only overall happiness demonstrated a significant negative correlation with child abuse potential. These results suggest that while associations are present among measures of parental satisfaction and child abuse potential, these associations are moderated to some extent by social desirability, which may help explain some of the inconsistencies reported in prior studies of parental satisfaction and child maltreatment potential.  相似文献   
983.
Purpose. The purpose of this study was to examine the influence of rape myth acceptance, belief in a just world, and sexual attitudes on attributions of responsibility in a date rape scenario. We predicted that people higher in rape myth acceptance and those who more strongly believed in a just world, as well as those who held more conservative sexual attitudes, would attribute greater blame to the accuser than to the accused. Methods. One hundred seventy‐two undergraduates from a medium‐sized, Catholic university in the USA read a hypothetical date rape scenario and completed the Rape Myth Acceptance Scale, the Just World Scale, the Sexual Attitudes Scale, and a Judgment Questionnaire constructed for the current study. Results. Rape myth acceptance mediated the relationship between gender and judgments of responsibility for the accused and the accuser. Men were more likely to endorse rape myths and, consequently, assign less responsibility to the accused and more responsibility to the accuser than women. Conclusions. Pre‐existing beliefs regarding the nature of rape and the circumstances surrounding it may bias attributions of responsibility in date rape cases. There may be utility in addressing whether jurors hold such beliefs prior to the start of a trial.  相似文献   
984.
985.
986.
Telephone surveys have been a principle means of learning about the attitudes and behaviors of citizens and voters. The single mode telephone survey, however, is increasingly threatened by rising costs, the declining use of landline telephones, and declining participation rates. One solution to these problems has been the introduction of mixed-mode surveys. However, such designs are relatively new and questions about their representativeness and the intricacies of the methodology remain. We report on the representativeness of a post election mixed-mode (Internet and mail) survey design of 2006 general election voters. We compare sample respondent means to sample frame means on key demographic characteristics and examine how mail and Internet respondents differed in terms of attitudes, behaviors and demographics. We find that overall the Internet respondents were representative of the population and that respondent choice of mode did not influence item response. We conclude that mixed-mode designs may allow researchers to ask important questions about political behavior from their desktops.  相似文献   
987.
Institutional apologies for historical injustices can be conceived as acts of symbolic inclusion directed to people whose collective experiences and memories of the past have not been recognized in the hegemonic narratives of the past. However, in this article it is argued that such apologies also have exclusionary potential as vehicles of symbolic politics of citizenship in that they may designate the apologizing community, so that it effectively excludes cultural ‘aliens’, like migrants, from the community of ‘remedial’ citizens. The article suggests a crucial point is the rhetoric shifts when one is appealing to both cultural and political solidarity, as when apologizing in the name of the state but simultaneously invoking ‘our’ nation and ‘our’ history. Thus, the increasing number of institutional historical apologies is not necessarily incompatible with the trend of reinforcing the symbolic boundaries around ‘our’ historical–cultural communities that has been visible recently, e.g. in the demands for cultural canons and citizenship tests in many Western societies.  相似文献   
988.
989.
990.
The conditions of doxilamine isolation from biological fluids are studied. The method of its extraction with a mixture of organic solvents in pH 9 is proposed. Identification of doxilamine with techniques of thin layer chromatography, UV-, IR-spectroscopy, chromato-mass-spectrometry, densitometry, gas-liquid chromatography is described. UV-spectrometry, gas chromatography and densitometry can be used for quantitation of doxilamine.  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