全文获取类型
收费全文 | 270篇 |
免费 | 7篇 |
专业分类
各国政治 | 6篇 |
工人农民 | 27篇 |
世界政治 | 29篇 |
外交国际关系 | 16篇 |
法律 | 138篇 |
政治理论 | 52篇 |
综合类 | 9篇 |
出版年
2022年 | 2篇 |
2021年 | 2篇 |
2020年 | 10篇 |
2019年 | 10篇 |
2018年 | 14篇 |
2017年 | 10篇 |
2016年 | 11篇 |
2015年 | 5篇 |
2014年 | 10篇 |
2013年 | 38篇 |
2012年 | 14篇 |
2011年 | 8篇 |
2010年 | 2篇 |
2009年 | 8篇 |
2008年 | 7篇 |
2007年 | 13篇 |
2006年 | 9篇 |
2005年 | 8篇 |
2004年 | 6篇 |
2003年 | 7篇 |
2002年 | 15篇 |
2001年 | 6篇 |
2000年 | 5篇 |
1999年 | 6篇 |
1998年 | 7篇 |
1997年 | 4篇 |
1996年 | 1篇 |
1995年 | 6篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 5篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1966年 | 1篇 |
排序方式: 共有277条查询结果,搜索用时 15 毫秒
191.
192.
193.
194.
Louise Frogner Henrik Andershed Odd Lindberg Marcus Johansson 《European Journal on Criminal Policy and Research》2013,19(4):333-350
This study examines a hot spot policing intervention where private security guards patrolled a specific area in the city centre of a mid-sized Swedish town during summer weekend evenings and nights, aiming to reduce the number of reported street violence incidents. A follow-up of the intervention, using previous years as a control was conducted to measure changes in the number of street violence rates before and during the intervention. The results show non-significant decreases in the number of reported street violence incidents during the intervention. The results can be interpreted in at least two ways: that the intervention had no effects; or that the small, but non-significant decreases observed, are indeed small effects that can be strengthened by modifying the implementation of the intervention. An additional analysis shows that the changes in crime rates are larger at times when the guards adapted a stricter hot spot policing approach, which indicates that with a more structured implementation of the intervention it might be possible to see larger effects. 相似文献
195.
196.
Louise Richardson 《Political science quarterly》1999,114(2):326-327
197.
198.
199.
200.
Bell SE Fido LA Sirimuthu NM Speers SJ Peters KL Cosbey SH 《Journal of forensic sciences》2007,52(5):1063-1067
2,5,-Dimethoxy-4-bromoamphetamine (DOB) is of particular interest among the various "ecstasy" variants because there is an unusually long delay between consumption and effect, which dramatically increases the danger of accidental overdose in users. Screening for DOB in tablets is problematic because it is pharmacologically active at 0.2-3 mg, which is c. 50 times less than 3,4-methylenedioxy-N-methylamphetamine (MDMA) and makes it more difficult to detect in seized tablets using conventional spot tests. The normal Raman spectra of seized DOB tablets are dominated by the bands of the excipient with no evidence of the drug component. Here we report the first use of on-tablet surface-enhanced Raman spectroscopy (SERS) to enhance the signal from a low concentration drug. Raman studies (785-nm excitation) were carried on series of model DOB/lactose tablets (total mass c. 400 mg) containing between 1 mg and 15 microg of DOB and on seized DOB tablets. To generate surface-enhanced spectra, 5 microL of centrifuged silver colloid was dispensed onto the upper surface of the tablets, followed by 5 microL of 1.0 mol/dm(3) NaCl. The probe laser was directed onto the treated area and spectra accumulated for c. 20 sec (10 sec x 2). It was found that the enhancement of the DOB component in the model tablets containing 1 mg DOB/tablet and in the seized tablets tested was so large that their spectra were completely dominated by the vibrational bands of DOB with little or no contribution from the unenhanced lactose excipient. Indeed, the most intense DOB band was visible even in tablets containing just 15 microg of the drug. On-tablet surface-enhanced Raman spectroscopy is a simple method to distinguish between low dose DOB tablets and those with no active constituent. The fact that unique spectra are obtained allows identification of the drug while the lack of sample preparation and short signal accumulation times mean that the entire test can be carried out in <1 min. 相似文献