全文获取类型
收费全文 | 207篇 |
免费 | 5篇 |
专业分类
各国政治 | 2篇 |
工人农民 | 19篇 |
世界政治 | 16篇 |
外交国际关系 | 9篇 |
法律 | 93篇 |
中国政治 | 1篇 |
政治理论 | 72篇 |
出版年
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 11篇 |
2018年 | 10篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 9篇 |
2014年 | 7篇 |
2013年 | 22篇 |
2012年 | 3篇 |
2011年 | 6篇 |
2010年 | 8篇 |
2009年 | 8篇 |
2008年 | 9篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 2篇 |
2004年 | 4篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 8篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 4篇 |
1983年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有212条查询结果,搜索用时 15 毫秒
121.
122.
123.
124.
In a previous study, 18 repeated exposures of anaesthetized swine to an electro-muscular incapacitating device (TASER International's ADVANCED TASER X26 electronic control device) resulted in acidosis and increases in blood electrolytes. In the current study, experiments were performed to investigate effects of a more typical scenario of repeated exposures of the device on muscle contraction and changes in blood factors. Ten swine were exposed for 5s, followed by a 5-s period of no exposure, three times. Selected blood factors were monitored for 3h following exposure. Transient increases in blood glucose, lactate, sodium, potassium, calcium, and pCO(2) were consistent with previous reports in the literature dealing with studies of muscle stimulation or exercise. Blood pH was decreased immediately following exposure, but subsequently returned toward a normal level. Oxygen saturation (measured by pulse oximetry) was not changed significantly. In conclusion, three repeated TASER device exposures had only transient effects on blood factors, which all returned to pre-exposure levels, with the exception of hematocrit (which remained elevated after 3h). Since the increase in this factor was less than that which may occur after short periods of exercise, it is unlikely that this would be an indicator of any serious harm. 相似文献
125.
Katherine Cook 《African and Black Diaspora: An International Journal》2019,12(1):77-93
Anglican church commemoration in Barbados is traditionally viewed as reflecting a wholly white, British history; however, beginning in the late eighteenth century, these spaces were circumvented as places of memory for the freed black community. As abolition and emancipation triggered greater integration of previously racially segregated groups on the island, funerary monuments provided the opportunity to negotiate memory, social structure, and community relationships, subverting dominant power hierarchies and tensions stimulated by race, religion, and marginalization. This paper will reconstruct narratives and counter-narratives in burial practice and monument use against the backdrop of abolition and emancipation to contribute to historical and archaeological understandings of historical processes of colonization and decolonization, relevant to Barbados and other colonies dependent on slave labour. 相似文献
126.
Stephanie H. Cook José A. Bauermeister Deborah Gordon-Messer Marc A. Zimmerman 《Journal of youth and adolescence》2013,42(11):1674-1686
Researchers have reported that network characteristics are associated with substance use behavior. Considering that social interactions within online networks are increasingly common, we examined the relationship between online network characteristics and substance use in a sample of emerging adults (ages 18–24) from across the United States (N = 2,153; M = 21 years old; 47 % female; 70 % White). We used regression analyses to examine the relationship between online ego network characteristics (i.e., characteristics of individuals directly related to the focal participant plus the relationships shared among individuals within the online network) and alcohol use and substance use, respectively. Alcohol use was associated with network density (i.e., interconnectedness between individuals in a network), total number of peer ties, and a greater proportion of emotionally close ties. In sex-stratified models, density was related to alcohol use for males but not females. Drug use was associated with an increased number of peer ties, and the increased proportion of network members’ discussion and acceptance of drug use, respectively. We also found that online network density and total numbers of ties were associated with more personal drug use for males but not females. Conversely, we noted that social norms were related to increased drug use and this relationship was stronger for females than males. We discuss the implications of our findings for substance use and online network research. 相似文献
127.
Philip J. Cook Robert MacCoun Clara Muschkin Jacob Vigdor 《Journal of policy analysis and management》2008,27(1):104-121
Using administrative data on public school students in North Carolina, we find that sixth grade students attending middle schools are much more likely to be cited for discipline problems than those attending elementary school. That difference remains after adjusting for the socioeconomic and demographic characteristics of the students and their schools. Furthermore, the higher infraction rates recorded by sixth graders who are placed in middle school persist at least through ninth grade. An analysis of end‐of‐grade test scores provides complementary findings. A plausible explanation is that sixth graders are at an especially impressionable age; in middle school, the exposure to older peers and the relative freedom from supervision have deleterious consequences. These findings are relevant to the current debate over the best school configuration for incorporating the middle grades. Based on our results, we suggest that there is a strong argument for separating sixth graders from older adolescents. © 2008 by the Association for Public Policy Analysis and Management. 相似文献
128.
129.
Tom Cook B.Sc. Raul Sutton Ph.D. Kevan Buckley Ph.D. 《Journal of forensic sciences》2013,58(6):1495-1502
Palmprints are identified using matching of minutia points, which can be time consuming for fingerprint experts and in database searches. This article analyzes the operational characteristics of a palmar flexion crease (PFC) identification software tool, using a dataset of 10 replicates of 100 palms, where the user can label and match palmar line features. Results show that 100 palmprint images modified 10 times each using rotation, translation, and additive noise, mimicking some of the characteristics found in crime scene palmar marks, can be identified with a 99.2% genuine acceptance rate and 0% false acceptance rate when labeled within 3.5 mm of the PFC. Partial palmprint images can also be identified using the same method to filter the dataset prior to traditional matching, while maintaining an effective genuine acceptance rate. The work shows that identification using PFCs can improve palmprint identification through integration with existing systems, and through dedicated palmprint identification applications. 相似文献
130.
While terrorist organizations have been analyzed for their motivations and tactics, little has been done to develop a systematic understanding of what makes some groups more dangerous than others. Knowing what makes some groups more threatening than others, or what conditions can influence a single group to become more or less of a threat, would help governments to prioritize resources during counterterrorism efforts. Using an approach similar to Ted Robert Gurr's assignment of a risk score to identify impending minority group rebellion, this article develops and tests a set of terrorist organizational characteristics. A two-phased approach is used. First, the authors identify key characteristics that could be anticipated to drive groups to be more active or deadly. The characteristics were identified and measured for terrorist groups for 1990–1994. The authors test group characteristics against subsequent group violence intensity from 1995 to 1999. Findings indicate that some group characteristics, such as religious ideology and group size, are important to understanding a group's relative level of violence. Though the study focused on a relatively short period of time, the findings indicate that a more comprehensive study of the impact that group characteristics have on violence levels would be a worthwhile undertaking. 相似文献