全文获取类型
收费全文 | 1571篇 |
免费 | 56篇 |
专业分类
各国政治 | 148篇 |
工人农民 | 84篇 |
世界政治 | 105篇 |
外交国际关系 | 101篇 |
法律 | 841篇 |
中国政治 | 7篇 |
政治理论 | 340篇 |
综合类 | 1篇 |
出版年
2024年 | 3篇 |
2023年 | 10篇 |
2022年 | 17篇 |
2021年 | 23篇 |
2020年 | 40篇 |
2019年 | 45篇 |
2018年 | 81篇 |
2017年 | 83篇 |
2016年 | 80篇 |
2015年 | 70篇 |
2014年 | 59篇 |
2013年 | 246篇 |
2012年 | 116篇 |
2011年 | 101篇 |
2010年 | 59篇 |
2009年 | 58篇 |
2008年 | 64篇 |
2007年 | 84篇 |
2006年 | 43篇 |
2005年 | 42篇 |
2004年 | 37篇 |
2003年 | 30篇 |
2002年 | 35篇 |
2001年 | 25篇 |
2000年 | 31篇 |
1999年 | 20篇 |
1998年 | 12篇 |
1997年 | 7篇 |
1996年 | 12篇 |
1995年 | 7篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 6篇 |
1991年 | 4篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1987年 | 3篇 |
1986年 | 5篇 |
1985年 | 2篇 |
1984年 | 6篇 |
1983年 | 8篇 |
1982年 | 8篇 |
1981年 | 2篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1967年 | 2篇 |
1965年 | 1篇 |
1963年 | 1篇 |
1962年 | 2篇 |
排序方式: 共有1627条查询结果,搜索用时 15 毫秒
881.
It has been argued, that closeness counts not only with respect to the overall decision of a (general) election, but also with respect to the outcome in subelectorates. This proposition is tested using data both from the last German Bundestagswahl as well as the UK General Election in 1987. We find that (expected) closeness counts for turnout on the level of the individual electoral district, but not on any level below, e.g. on the level of precincts. Therefore, closeness seems to count only if it is relevant for electoral victories or defeats. 相似文献
882.
Christer Jönsson 《Scandinavian political studies》1993,16(2):149-165
International politics is often portrayed as a hegemonic discipline, dominated by US scholarship. Exploring the consequences of recent upheavals in world affairs for international politics research, the article suggests that the end of the cold war has exposed certain weaknesses in the US center which may be turned into advantages for the Scandinavian periphery. Specifically, Scandinavian researchers do not share the American preoccupation with theories predicated on bilateral and symmetrical relationships. Moreover, they are more prone to focus on subnational actors, they are more embedded in political science, they are generalists rather than specialists, their primary role is that of being observers rather than advisers, and they are in a better position to escape from the entrapment of an ahistorical current-events approach. In conclusion, foreign policy analysis, negotiation studies, and research on international cooperation are singled out as areas where Scandinavians have been successful and where their relative success can be accounted for, at least in part, by an ability to capitalize on the comparative advantages identified. 相似文献
883.
Immunoaffinity extraction units (LSD ImmunElute) are commercially available for the analysis of lysergic acid diethylamide (LSD) in urine. The ImmunElute resin contains immobilized monoclonal antibodies to LSD. We applied the ImmunElute procedure to serum and also to human hair samples. For hair analysis the samples were first extracted with methanol under sonication. The extracts were then purified using the ImmunElute resin. LSD analysis was carried out with HPLC and fluorescence detection. The immunoaffinity extraction provides highly purified extracts for chromatographic analysis. The limit of detection (signal-to-noise ratio = 3) has been determined to be < 50 pg regardless of which sample material was used. The procedure was applied to authentic hair samples from drug abusers (n = 11). One of these samples tested positive with an amount of 110 pg LSD in 112 mg extracted hair corresponding to a concentration of 1 pg/mg. 相似文献
884.
Case report illustrating the dangerousness of a home-made pistol, which was not safe in use. On reloading the weapon a shot had fired killing a person nearby by a shot through the thorax injuring the pericardium, the pulmonary trunk and both lungs. 相似文献
885.
A ladder of 24 ACTBP2 (SE33) alleles was separated 175 times by denaturing capillary electrophoresis on an ABI Prism 310 Genetic Analyzer using polymer POP-4. The mean standard deviation of fragment size determination was 0.083 bp. Fragments in the whole allelic range of ACTBP2 could be typed with high precision and reproducibility if adjacent fragments differed by at least two nucleotides. The capacity of resolving 1 bp differences was tested by repeatedly running a ACTBP2*14.2/14.3/31.2/31.3 allelic mixture. The 14.2/14.3 fragment pair could be separated in 98%, the 31.2/31.3 fragment pair only in 65% of all runs. Reliable separation of this difficult fragment mixture could exclusively achieved by using POP-6. 相似文献
886.
887.
O Grüner 《Zeitschrift für Rechtsmedizin》1989,103(2):73-83
Strictly speaking, identity in forensic identification can--if need be--be established by the evidence of living persons. Otherwise, the entire identity can only be determined by assessing the individual parts of the corpse, whereby the different characteristics of the objects of examination have a different probative force, according to the frequency of their occurrence. In skull identification, by taking soft tissue thickness into consideration, with the help of modern photographic or electronical super projection processes, so many (theoretical) points of comparison come to the fore, that, in most cases, identity is evident due to the numerous agreeable reference points, which are apparent in suitable, comparable material (photographs). 相似文献
888.
889.
Grubwieser P Thaler A Köchl S Teissl R Rabl W Parson W 《Journal of forensic sciences》2003,48(4):733-741
This paper describes a systematic study of the influence of optical, physical, and chemical methods used for fingerprint enhancement on subsequent DNA analysis of biological stains. Latent fingerprints as well as fingerprints in contact with blood and saliva on different surfaces were treated with dactyloscopic methods. As a general finding, subsequent STR profiling of the blood/saliva traces led to good results after all the enhancement methods included in this study. Concerning blood enhancement procedures, the airbrush technique showed deleterious effects on subsequent STR analysis in some cases. We therefore recommend the implementation of the layer technique, as it brings advantages for fingerprint enhancement as well. It could also be shown that, as can be necessary in practical casework, two enhancement methods can be performed on a single stain without having influence on STR profiling. In terms of methodological variety, this paper reflects a comprehensive study performed on STR profiling after fingerprint enhancement methods, including rare methods and variations of techniques, which can be a useful alternative in certain case scenarios. 相似文献
890.
Römhild W Krause D Bartels H Ghanem A Schöning R Wittig H 《Forensic science international》2003,133(1-2):101-106
Pholedrine (4'-hydroxymethamphetamine) is a cardiovascular agent exerting hypertensive and adrenergic effects. High doses may cause a drop in the peripheral circulation blood flow and increase blood pressure, heart rate and body temperature up to a state of central respiratory paralysis. A 15-year-old girl who suffered from heavy agitation and hallucinations was admitted to the intensive care unit in a comatose state. The clinical findings included a maximum heart rate of 170 bpm and a body temperature of 43.8 degrees C. Resuscitation measures were in vain and abandoned after approximately 2h. A toxicological emergency analysis using GC/MS revealed a considerable amount of pholedrine in blood and urine. A method for determining pholedrine in human body fluids utilizing high-performance liquid chromatography (HPLC)/tandem mass spectrometry (LC-MS/MS) with a turbo ion-spray source was developed, using D11-methamphetamine and D5-methylenedioxymethamphetamine as internal standards. Samples were prepared by SPE extraction using SPEC-C18AR/MP3((R)) columns, which yielded the best extraction recovery (67%). Chromatographic separation was achieved at pH 5 on an RP-18 stationary phase applying gradient elution from 50 to 70% of B (methanol/acetonitrile 3/1 (v/v), 0.02% acetic acid) in A (5mM ammonium acetate/acetonitrile 95/5 (v/v), 0.02% acetic acid). Supra-pure acetic acid was added to the post-column effluent with a flow rate of 0.2 microl/min to optimize ionization. Detection was carried out in the positive ionization, multiple reaction monitoring (MRM) mode. The chromatograms showed no interference from other substances. The limit of detection (LOD, S/N=3) of pholedrine was 0.8 ng/ml and its lower limit of quantification (LLOQ, S/N=10) 3ng/ml. The calibration curve was linear (r=0.999) in the range 1-100 ng/ml. Samples with higher concentrations were diluted to suit the working range. The intra-day R.S.D. between 5 and 80 ng/ml were 3.8-8.7% and the inter-day R.S.D. between 5 and 100 ng/ml were 6.7-10.7%. The pholedrine concentrations in blood and urine collected when the girl was still alive were 16.1 microg/ml (R.S.D. 10.5%) and 1120 microg/ml (R.S.D. 8%), respectively. In post-mortem samples, they were 23.0 microg/ml (R.S.D. 5.1%) in heart blood and 27.3 microg/g (R.S.D. 6.6%) in the liver. 相似文献