全文获取类型
收费全文 | 869篇 |
免费 | 68篇 |
专业分类
各国政治 | 14篇 |
工人农民 | 5篇 |
世界政治 | 15篇 |
外交国际关系 | 68篇 |
法律 | 638篇 |
中国共产党 | 7篇 |
中国政治 | 9篇 |
政治理论 | 99篇 |
综合类 | 82篇 |
出版年
2024年 | 4篇 |
2023年 | 11篇 |
2022年 | 9篇 |
2021年 | 18篇 |
2020年 | 44篇 |
2019年 | 37篇 |
2018年 | 34篇 |
2017年 | 23篇 |
2016年 | 22篇 |
2015年 | 24篇 |
2014年 | 46篇 |
2013年 | 33篇 |
2012年 | 32篇 |
2011年 | 34篇 |
2010年 | 38篇 |
2009年 | 77篇 |
2008年 | 113篇 |
2007年 | 130篇 |
2006年 | 63篇 |
2005年 | 15篇 |
2004年 | 21篇 |
2003年 | 13篇 |
2002年 | 15篇 |
2001年 | 15篇 |
2000年 | 15篇 |
1999年 | 8篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 7篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
排序方式: 共有937条查询结果,搜索用时 15 毫秒
191.
Abstract: The choice of reagents for presumptive tests for blood, and subsequent extraction methodologies, can significantly affect both the quantity and quality of purified DNA. Blood samples directly tested with Hemastix® yielded <1% of the DNA recovered from untested samples when purified using the Qiagen BioRobot® EZ1 and EZ1® DNA Investigator kit. Full short tandem repeat profiles were obtained from both tested and untested samples, suggesting that the Hemastix® reagent(s) affect DNA binding, rather than produce DNA damage. The Hemastix® inhibition of DNA yield could be overcome by the addition of MTL buffer to the sample prior to extraction. Laboratories may wish to modify current procedures for extracting blood samples, utilize other extraction/purification methodologies, or inform their submitting agencies to avoid direct exposure of questioned bloodstains to Hemastix® reagents. 相似文献
192.
The impact of court errors on liability sharing and safety regulation for environmental/industrial accidents 总被引:1,自引:0,他引:1
We focus in this paper on the effects of court errors on the optimal sharing of liability between firms and financiers, as an environmental policy instrument. Using a structural model of the interactions between firms, financial institutions, governments and courts we show, through numerical simulations, the distortions in liability sharing between firms and financiers that the imperfect implementation of government policies implies. We consider in particular the role played by the efficiency of the courts in jointly avoiding Type I (finding an innocent firm guilty of inappropriate care) and Type II (finding a guilty firm not guilty of inappropriate care) errors. This role is considered in a context where liability sharing is already distorted (when compared with first best values) due not only to the courts’ own imperfect assessment of safety care levels exerted by firms but also to the presence of moral hazard and adverse selection in financial contracting. There is also not congruence of objectives between firms and financiers on the one hand and social welfare maximization on the other. Our results indicate that an increase in the efficiency of court system in avoiding errors raises safety care level, thereby reducing the probability of accident, and allowing the social welfare maximizing government to impose a lower liability [higher] share for firms [financiers] as well as a lower standard level of care. 相似文献
193.
194.
Corrupt reciprocity - Experimental evidence on a men's game 总被引:1,自引:0,他引:1
Why are women regarded to be more resistant towards corruption? We address this question by letting students allotted the role of public servants receive a bribe and choose between reporting (whistleblowing), opportunism and reciprocity (delivery of a contract to the briber). Those acting as businesspersons choose whether or not to publicize at the end of the game. Male businesspersons more often depart from maximizing payoffs and allocate resources to punishing opportunistic public servants. Instead of acting opportunistically, some public servants tend to reciprocate or report. We find that female public servants are less inclined to reciprocate. Their resistance towards corruption is found to relate less to a willingness to report. Survey data from international households shows that men are more confident that bribes will be reciprocated, supporting our results. 相似文献
195.
DAVID MILIBAND 《The Political quarterly》2011,82(2):131-137
The argument of this lecture speaks directly to the history of The Political Quarterly and the London School of Economics. It is that the European left is losing elections on an unprecedented scale because it has lost control of the political agenda to a newly flexible right; but it is also losing key arguments about how to nurture human values in today's connected and competitive global village because it has not responded to changes in economy and society; and that to turn things round it needs to address both its deficit in ideas and organisation. 相似文献
196.
Moreno LI Tate CM Knott EL McDaniel JE Rogers SS Koons BW Kavlick MF Craig RL Robertson JM 《Journal of forensic sciences》2012,57(4):1051-1058
The potential application of mRNA for the identification of biological fluids using molecular techniques has been a recent development in forensic serology. Constitutively expressed housekeeping genes can assess the amount of mRNA recovered from a sample, establish its suitability for downstream applications, and provide a reference point to corroborate the identity of the fluid. qPCR was utilized to compare the expression levels of housekeeping genes from forensic-like body fluid stains to establish the most appropriate assessment of human mRNA quantity prior to profiling. Although variability was observed between fluids and individuals, results indicated that beta-2 microglobulin exhibited the highest expression for all body fluids examined and across donors. A one-way analysis of variance was performed for housekeeping gene variability between donors (at the α, 0.05, significance level), and the results indicated significant differences for semen, vaginal secretions, and menstrual blood. 相似文献
197.
The utilization of 3D computerized systems has allowed more effective procedures for forensic facial reconstruction. Three 3D computerized facial reconstructions were produced using skull models from live adult Korean subjects to assess facial morphology prediction accuracy. The 3D skeletal and facial data were recorded from the subjects in an upright position using a cone-beam CT scanner. Shell-to-shell deviation maps were created using 3D surface comparison software, and the deviation errors between the reconstructed and target faces were measured. Results showed that 54%, 65%, and 77% of the three facial reconstruction surfaces had <2.5 mm of error when compared to the relevant target face. The average error for each reconstruction was -0.46 mm (SD = 2.81) for A, -0.31 mm (SD = 2.40) for B, and -0.49 mm (SD = 2.16) for C. The facial features of the reconstructions demonstrated good levels of accuracy compared to the target faces. 相似文献
198.
C Terranova M Tucci D Sartore F Cavarzeran L Barzon G Palù SD Ferrara 《Journal of forensic sciences》2012,57(5):1343-1348
The aim of this study is to propose an innovative approach evaluating the connection between alcohol use disorders and criminal behavior. The research, structured as a case–control study, was based on the analysis of environmental (social variables) and genetic factors (single nucleotide polymorphisms of glutamic acid decarboxylase) in a population (N = 173) of Italian alcohol‐dependent men. Group 1 (N = 47, convicted subjects) was compared with Group 2 (N = 126, no previous criminal conduct). Grade repetition, work problems, and drug problems were statistically associated with criminal behavior. Having daily family meals together and having children were inversely related to convictions. The genotype distribution of the two groups was similar. The association between environmental factors and antisocial behavior confirms previous findings in the literature. The lack of genetic association does not exclude the role of the gamma‐aminobutyric acid (GABA) system in determining antisocial behavior; further studies with larger samples are needed, together with investigation of other components of the GABA pathway. 相似文献
199.
目的研究腹腔连续注射低剂量氯胺酮后大鼠海马自噬相关蛋白LC3、Beclin1的表达及其意义。方法 SD大鼠30只随机分为用药组和对照组,用药组大鼠以5mg/kg的剂量腹腔注射氯胺酮,每间隔30min 1次,共5次。对照组予以等量生理盐水。用药组大鼠按用药后时间不同分为6小组,分别于末次给药后1,3,6,12,24,48h后取海马组织备用,用免疫荧光技术和Western blot技术检测大鼠海马组织中LC3、Beclin1的表达,应用统计学处理,比较用药组与对照组的蛋白表达差异。结果与对照组比较,用药组大鼠海马组织中LC3Ⅱ/LC3Ⅰ值在1h表达开始增多,6h呈强表达,Beclinl的表达在6h开始增多,12,24,48h都呈强表达(P<0.05)。结论腹腔连续注射低剂量氯胺酮能促进海马组织发生自噬,自噬增强是对氯胺酮毒性的反应。 相似文献
200.