全文获取类型
收费全文 | 1141篇 |
免费 | 65篇 |
专业分类
各国政治 | 25篇 |
工人农民 | 180篇 |
世界政治 | 56篇 |
外交国际关系 | 34篇 |
法律 | 670篇 |
中国共产党 | 1篇 |
中国政治 | 21篇 |
政治理论 | 216篇 |
综合类 | 3篇 |
出版年
2024年 | 1篇 |
2023年 | 12篇 |
2022年 | 10篇 |
2021年 | 10篇 |
2020年 | 32篇 |
2019年 | 42篇 |
2018年 | 56篇 |
2017年 | 59篇 |
2016年 | 50篇 |
2015年 | 59篇 |
2014年 | 56篇 |
2013年 | 160篇 |
2012年 | 56篇 |
2011年 | 77篇 |
2010年 | 41篇 |
2009年 | 55篇 |
2008年 | 65篇 |
2007年 | 42篇 |
2006年 | 49篇 |
2005年 | 38篇 |
2004年 | 34篇 |
2003年 | 34篇 |
2002年 | 30篇 |
2001年 | 28篇 |
2000年 | 11篇 |
1999年 | 13篇 |
1998年 | 18篇 |
1997年 | 12篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 9篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 4篇 |
1988年 | 4篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1973年 | 1篇 |
1970年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有1206条查询结果,搜索用时 15 毫秒
31.
Charlotte Murphy Ph.D. June Kenna M.Sc. Lorna Flanagan Ph.D. Marce Lee Gorman B.Sc. Clara Boland Ph.D. Jennifer Ryan Ph.D. 《Journal of forensic sciences》2020,65(2):399-405
This study is the first to examine the background level of male DNA on underpants worn by females in the absence of sexual contact. Here, we examined 103 samples from the inside front of underpants from 85 female volunteers. Samples were examined for the presence of male DNA using NGM SElect and PowerPlex Y23 kits. Only five samples gave a “complete” Y-STR profile, even though 83.5% of our volunteers cohabited with a male. In all cases where a partner reference sample was available, the Y-STR profile matched the cohabiting partner. We have demonstrated that a Y-STR profile is not expected on the inside front of underpants worn by females after social contact alone. The results of this study are informative for evaluating the significance of a Y-STR profile on underpants in cases of alleged sexual assault. 相似文献
32.
Emily E. Fairbanks M.S. Jennifer Turner M.S. Junkun Ma Ph.D. Jorn Yu Ph.D. 《Journal of forensic sciences》2020,65(6):1954-1960
Trigger pull is the force that needs to be exerted on the trigger to discharge a firearm. The measurement of trigger pull can assist in the evaluation of the safety, function, and manufacturing characteristics associated with a firearm during the forensic firearm examination process. Nonetheless, the accuracy and uncertainty of trigger pull measurements may be affected by the measuring device, test procedure, and environmental conditions. In this work, an innovative finger-trigger interface device was developed to facilitate accurate trigger pull measurements. The idea was to reduce the variation related to the position of the measurement device on the trigger in existing measuring methods and devices. Three force sensors based on different technologies were initially evaluated. While two of the three sensors failed to produce data, the miniature capacitive plate sensor exhibited high precision and a linear response over the range of typical trigger pulls. To examine the effects of the finger-trigger interface on trigger pull measurement, different sensor housing prototypes were designed in silico and 3D printed for the construction of three finger-trigger interface devices. The performance of each finger-trigger interface device was evaluated by measuring the trigger pulls of several selected firearms and comparing the data to a previously published study. Our preliminary results demonstrated the novel finger-trigger interface device offered a new way to measure trigger pull in situ with acceptable accuracy and precision. 相似文献
33.
Juvenile and family court judges are a professional group that have a significant amount of decision-making power in cases of sex trafficking of minors. The purpose of this project is to examine the association of juvenile and family court judges’ gender, race, and U.S. region with their attitudes and knowledge about sex trafficking of minors. Drawing from a survey of 55 juvenile and family court judges in the U.S., this study used standardized scales to measure attitudes and knowledge about child sex trafficking. Results indicate some differences by gender and geography in a sample of experienced judges across the U.S. The consistency of these findings are discussed in the context of other research and implications for targeted training. 相似文献
34.
35.
36.
37.
Underage drinking is among the most serious of public health problems facing adolescents in the United States. Recent concerns
have centered on young women, reflected in media reports and arrest statistics on their increasing problematic alcohol use.
This study rigorously examined whether girls’ alcohol use rose by applying time series methods to both arrest data, Uniform Crime Reports, and self-report data from Monitoring the Future, a nationally representative long-term survey gathered independently of crime control agents. All self-reported drinking behaviors
across all age groups show declining or unchanged female rates and no significant change in the gender gap, while the official
source displays a steady narrowing gender gap and some increase of female arrest rates for liquor law violations. Results
indicate that social control measures applied to underage drinking have shifted to target young women’s drinking patterns,
but their drinking has not become more widespread/problematic. Girls’ increased alcohol use and abuse is a socially constructed
problem, rather than the result of normalization of drinking or more strain in girls’ lives. Future underage drinking policies
and practices that apply legal intervention strategies to less chronic adolescent drinking behaviors will increase the visibility
of girls’ drinking. 相似文献
38.
Jennifer Brown Urban Selva Lewin-Bizan Richard M. Lerner 《Journal of youth and adolescence》2010,39(7):783-800
Extracurricular activities provide a key context for youth development, and participation has been linked with positive developmental
outcomes. Using data from the 4-H Study of Positive Youth Development (PYD), this study explored how the intentional self
regulation ability of youth interacted with participation in extracurricular activities to affect PYD among adolescents living
in neighborhoods with relatively low ecological assets. In total, 545 youth were included in the study (50.3% female). Most
of the youth were European American (41%) or Latino (37%; African American, 10%; Asian American, 7%; Native American, 4%;
and other, 1%). In general, youth with the greatest capacity to self regulate benefitted the most, as compared to their peers
with less capacity to self regulate, from involvement in extracurricular activities. Consistent with a developmental systems
perspective, and specifically with bioecological theory, the findings from this study confirmed that, within lower asset settings,
children with the most positive person-level factors (intentional self regulation) benefit the most from proximal processes
such as extracurricular activity involvement. 相似文献
39.
From 9/11 in the U.S. to train, subway, and airport bombings elsewhere, individuals frequently must make political decisions
in the shadow of terrorist attacks. To date, few studies have examined how times of terror threat influence voters’ decision-making
processes. Using data generated from three experiments we show that, in times of terrorist threat (compared to good times),
individuals weight leadership more heavily in the voting booth. Our results also shed light on how much weight is given to
other determinants of the vote (issues and partisanship) across these two conditions. 相似文献
40.
Jennifer E. Lansford Ley A. Killeya-Jones Shari Miller Philip R. Costanzo 《Journal of youth and adolescence》2009,38(8):1084-1095
Sociometric nominations, social cognitive maps, and self-report questionnaires were completed in consecutive years by 327
students (56% girls) followed longitudinally from grade 7 to grade 8 to examine the stability of social standing in peer groups
and correlates of changes in social standing. Social preference, perceived popularity, network centrality, and leadership
were moderately stable from grade 7 to grade 8. Alcohol use and relational aggression in grade 7 predicted changes in social
preference and centrality, respectively, between grade 7 and grade 8, but these effects were moderated by gender and ethnicity.
Changes in social standing from grade 7 to grade 8 were unrelated to grade 8 physical aggression, relational aggression, and
alcohol use after controlling for the grade 7 corollaries of these behaviors. Results are discussed in terms of their implications
for understanding links between social standing and problem behaviors during adolescence.
相似文献
Jennifer E. LansfordEmail: |