全文获取类型
收费全文 | 2175篇 |
免费 | 110篇 |
专业分类
各国政治 | 143篇 |
工人农民 | 107篇 |
世界政治 | 217篇 |
外交国际关系 | 117篇 |
法律 | 1035篇 |
中国政治 | 12篇 |
政治理论 | 635篇 |
综合类 | 19篇 |
出版年
2023年 | 11篇 |
2022年 | 5篇 |
2021年 | 19篇 |
2020年 | 46篇 |
2019年 | 56篇 |
2018年 | 71篇 |
2017年 | 91篇 |
2016年 | 73篇 |
2015年 | 58篇 |
2014年 | 83篇 |
2013年 | 335篇 |
2012年 | 74篇 |
2011年 | 99篇 |
2010年 | 61篇 |
2009年 | 79篇 |
2008年 | 64篇 |
2007年 | 85篇 |
2006年 | 85篇 |
2005年 | 86篇 |
2004年 | 75篇 |
2003年 | 87篇 |
2002年 | 82篇 |
2001年 | 42篇 |
2000年 | 44篇 |
1999年 | 40篇 |
1998年 | 39篇 |
1997年 | 39篇 |
1996年 | 30篇 |
1995年 | 35篇 |
1994年 | 31篇 |
1993年 | 21篇 |
1992年 | 21篇 |
1991年 | 16篇 |
1990年 | 24篇 |
1989年 | 14篇 |
1988年 | 25篇 |
1987年 | 16篇 |
1986年 | 9篇 |
1985年 | 18篇 |
1984年 | 16篇 |
1983年 | 12篇 |
1982年 | 7篇 |
1981年 | 9篇 |
1980年 | 10篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1976年 | 7篇 |
1973年 | 4篇 |
1970年 | 3篇 |
1967年 | 3篇 |
排序方式: 共有2285条查询结果,搜索用时 15 毫秒
931.
The study of decaying organisms and death assemblages is referred to as forensic taphonomy, or more simply the study of graves. This field is dominated by the fields of entomology, anthropology and archaeology. Forensic taphonomy also includes the study of the ecology and chemistry of the burial environment. Studies in forensic taphonomy often require the use of analogues for human cadavers or their component parts. These might include animal cadavers or skeletal muscle tissue. However, sufficient supplies of cadavers or analogues may require periodic freezing of test material prior to experimental inhumation in the soil. This study was carried out to ascertain the effect of freezing on skeletal muscle tissue prior to inhumation and decomposition in a soil environment under controlled laboratory conditions. Changes in soil chemistry were also measured. In order to test the impact of freezing, skeletal muscle tissue (Sus scrofa) was frozen (?20 °C) or refrigerated (4 °C). Portions of skeletal muscle tissue (~1.5 g) were interred in microcosms (72 mm diameter × 120 mm height) containing sieved (2 mm) soil (sand) adjusted to 50% water holding capacity. The experiment had three treatments: control with no skeletal muscle tissue, microcosms containing frozen skeletal muscle tissue and those containing refrigerated tissue. The microcosms were destructively harvested at sequential periods of 2, 4, 6, 8, 12, 16, 23, 30 and 37 days after interment of skeletal muscle tissue. These harvests were replicated 6 times for each treatment. Microbial activity (carbon dioxide respiration) was monitored throughout the experiment. At harvest the skeletal muscle tissue was removed and the detritosphere soil was sampled for chemical analysis. Freezing was found to have no significant impact on decomposition or soil chemistry compared to unfrozen samples in the current study using skeletal muscle tissue. However, the interment of skeletal muscle tissue had a significant impact on the microbial activity (carbon dioxide respiration) and chemistry of the surrounding soil including: pH, electroconductivity, ammonium, nitrate, phosphate and potassium. This is the first laboratory controlled study to measure changes in inorganic chemistry in soil associated with the decomposition of skeletal muscle tissue in combination with microbial activity. 相似文献
932.
Bengt B. Arnetz Dana C. Nevedal Mark A. Lumley Lena Backman Ake Lublin 《Journal of Police and Criminal Psychology》2009,24(1):1-9
The objective of this study is to test the effects of police trauma resilience training on stress and performance during a
critical incident police work simulation. Rookie police officers (N = 18) participated in a randomized trial of a 10-week imagery and skills training program versus training as usual. Twelve
months later, psychophysiological stress and police work performance were assessed during a live critical incident simulation.
Training resulted in significantly less negative mood, less heart rate reactivity, a larger increase in antithrombin, and
better police performance compared to controls. Trends for cortisol and self-reported stress also suggested benefits of training.
This novel training program is a promising paradigm for improving police well-being, stress resiliency, and optimizing job
performance. 相似文献
933.
Linda Pagani Richard E. Tremblay Daniel Nagin Mark Zoccolillo Frank Vitaro Pierre McDuff 《Journal of family violence》2009,24(3):173-182
Using a French-Canadian population-based longitudinal data set, we examine the impact of socioeconomic factors (paternal education
and family structure); inherent individual factors (child gender and developmental trajectories of physical aggression from
early to later childhood, problematic substance use), family environment (concurrent parent-child involvement, parental problematic
substance use), and prospective and concurrent parenting process variables (mean parental supervision at puberty, concurrent
punishment practices) as predictors of adolescent-directed aggression against fathers (in the last 6 months). A childhood
behavioral pattern characterized by physical aggression showed the highest risk of adolescent-directed verbal and physical
aggression toward fathers, regardless of sex. In terms of parental practices, verbal (and not corporal) punishment in the
last 6 months significantly predicted aggression toward fathers. A childhood life-course of violence is likely to culminate
in aggression toward fathers during adolescence. Beyond this risk, it seems that harsh verbal punishment by parents builds
up the odds of child-directed aggression against fathers. 相似文献
934.
This article explores the importance of various debt policy factors using a national survey of government finance officers. Further, it examines whether the presence of a particular factor in a debt policy influences finance officers' perception of its importance. We find that debt policies tend to be technical in nature and that broad policy issues are most often not included in debt policies. Moreover, we find that the inclusion of debt management factors in debt policies has a powerful influence on their perceived importance by public managers. 相似文献
935.
Recent research has questioned both the rigor and theoretical development of public administration research. The proposed solutions have generally endorsed a more academically oriented research agenda. Authors have discussed practitioner needs, but the focus has been on the appropriateness of different research methods rather than the types of knowledge needed. We seek to contribute to this ongoing debate by comparing the knowledge needs identified by members of the International City/County Management Association (ICMA) with 15 years of research in Public Administration Review . We found much published research matching the needs of ICMA members, but it focused on a relatively narrow range of topics. We recommend incorporating a concern for relevance into efforts to improve public administration research. This will help to ensure that we build a knowledge base that makes a substantial contribution to practice. 相似文献
936.
937.
938.
This article explores how terrorists acting alone or in small groups have used sports events as symbolic targets in their performance of terrorism. Drawing on a comparative analysis of the attacks on the 1996 Atlanta Olympic Games and the 2013 Boston Marathon, it is argued that terrorist target selection of major sports events should be understood in relation to the grievances and desires of the perpetrators. The article finds that rather than being the primary target of their attacks, sports events are among a broader range of densely crowded spaces that terrorist actors may seek to target as part of their violent struggle against their adversaries. The findings are contextualized in relation to broader patterns and trends in lone wolf terrorism, including the significance of a copycat phenomenon and inspiration effect. 相似文献
939.
940.