全文获取类型
收费全文 | 1509篇 |
免费 | 85篇 |
专业分类
各国政治 | 90篇 |
工人农民 | 70篇 |
世界政治 | 132篇 |
外交国际关系 | 116篇 |
法律 | 807篇 |
中国政治 | 16篇 |
政治理论 | 353篇 |
综合类 | 10篇 |
出版年
2023年 | 24篇 |
2022年 | 19篇 |
2021年 | 23篇 |
2020年 | 39篇 |
2019年 | 60篇 |
2018年 | 63篇 |
2017年 | 68篇 |
2016年 | 79篇 |
2015年 | 45篇 |
2014年 | 68篇 |
2013年 | 224篇 |
2012年 | 67篇 |
2011年 | 51篇 |
2010年 | 43篇 |
2009年 | 45篇 |
2008年 | 53篇 |
2007年 | 69篇 |
2006年 | 53篇 |
2005年 | 68篇 |
2004年 | 50篇 |
2003年 | 46篇 |
2002年 | 61篇 |
2001年 | 28篇 |
2000年 | 25篇 |
1999年 | 27篇 |
1998年 | 16篇 |
1997年 | 10篇 |
1996年 | 8篇 |
1995年 | 15篇 |
1994年 | 13篇 |
1993年 | 5篇 |
1992年 | 21篇 |
1991年 | 8篇 |
1990年 | 7篇 |
1989年 | 11篇 |
1988年 | 9篇 |
1987年 | 7篇 |
1986年 | 10篇 |
1985年 | 9篇 |
1984年 | 4篇 |
1983年 | 8篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1975年 | 3篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 2篇 |
1969年 | 3篇 |
1966年 | 3篇 |
排序方式: 共有1594条查询结果,搜索用时 31 毫秒
91.
Robino C Varacalli S Gino S Chatzikyriakidou A Kouvatsi A Triantaphyllidis C Di Gaetano C Crobu F Matullo G Piazza A Torre C 《Forensic science international》2004,146(1):61-64
Eight Y chromosome short tandem repeat (STR) polymorphisms (DYS19, DYS385, DYS389I, DYS389II, DYS390, DYS391, DYS392, and DYS393) were analyzed in the sample of 117 unrelated Albanian males living in Kosovo. A general STR allelic frequency pattern in the Albanian population from Kosovo corresponds to other European populations. Fourty six haplotypes were observed in single copy. The most frequent haplotypes were (DYS19-DYS385-DYS389I-DYS389II-DYS390-DYS391-DYS392-DYS393) 14-11/11-13-29-24-11-13-13 (10.26%), 14-14/17-12-28-24-10-11-12 (9.40%), 13-16/18-13-30-24-10-11-13 (9.40%), and 14-17/17-13-31-24-10-11-13 (9.40%). 相似文献
92.
93.
An HPLC-APCI-MS(/MS) method for the (trace) analysis of the most commonly encountered peroxide explosives, hexamethylenetriperoxidediamine (HMTD) and triacetonetriperoxide (TATP), has been developed. With this method, HMTD and TATP have been analyzed in the same run. (Pseudo-)molecular ions of these peroxides have been obtained as base peak under the same condition. A series of product ions was produced from these pseudo-molecular ions ([HMTD - 1]+ and [TATP + NH4]+) in the MS/MS analysis. We also pioneered in showing that a TATP molecular ion [TATP + H]+ can be observed with HPLC-MS/MS. The limit of detection for HMTD and TATP was 0.26 and 3.3 ng, respectively, on column by HPLC-MS in the Full Scan mode and 0.08 and 0.8, respectively, by HPLC-APCI-MS/MS in Selected Reaction Monitoring (single mass unit) mode. The method presented has been applied successfully for the identification of peroxides in the bulk solid state (powder sample), as well as in post-blast extracts originating from a forensic case. For the post-blast extracts, the use of tandem MS has been shown clearly to be of crucial importance for the identification and detection of the peroxide explosives. 相似文献
94.
95.
Góes AC da Silva DA Fonseca Gil EH da Silva MT Pereira RW de Carvalho EF 《Forensic science international》2004,140(1):131-132
Allele frequencies for 16 short tandem repeats (STR) loci were determined with a sample of 230-300 unrelated individuals from the population of Rio de Janeiro, Brazil. The loci are the most commonly used in forensic and paternity testing, being analysed by the Identifiler (Applied Biosystems) and PowerPlex 2.1 (Promega) commercial kits. It was proved that Penta E and D18S51 are the most polymorphic loci. 相似文献
96.
Nine STRs loci have been typed in a sample from Córdoba (Argentina). 相似文献
97.
Paredes M Galindo A Bernal M Avila S Andrade D Vergara C Rincón M Romero RE Navarrete M Cárdenas M Ortega J Suarez D Cifuentes A Salas A Carracedo A 《Forensic science international》2003,137(1):67-73
Genotype polymorphism studies at the 13 loci STRs included in the combined DNA index system [CODIS and PCR-based short tandem repeat loci, in: Proceedings of the Second European Symposium on Human Identification, Promega Corporation, Madison, WI, 1998, pp. 73-88; J. Forensic Sci. 46 (2001) 453] (CODIS: D3S1358, HUMvWA31, HUMFGA, D8S1179 D21S11, D18S51, D5S818, D13S317, D7S820, HUMTH01, HUMTPOX, HUMCSF1PO and D16S539) were carried out in a sample of 1429 unrelated Colombian individuals belonging to 25 different departments. As many other countries in Latino-America, Colombia shows an important admixture component, basically integrated by Amerindians, European-descendants and African-descendants. Due to the fact that only partial population analyses have been carried out in the country, the main aim of the present analysis is to establish a database of forensic interest based on the widely used CODIS systems covering the main Colombian regions. 相似文献
98.
Fondevila M Jaime JC Salas A Lareu MV Carracedo A 《Forensic science international》2003,137(2-3):217-220
Eight Y-chromosome STRs were investigated in a male population sample from Córdoba region (Argentina). Complete Y-chromosomal STRs haplotypes were obtained in 100 individuals, among which 91 different haplotypes were observed. The most common haplotype was shared by 4% of the sample, while 86 haplotypes were unique. The gene diversity was 0.9875 and the discrimination capacity was 0.8600. The combined polymorphism provides a powerful discrimination tool for routine forensic applications. 相似文献
99.
Sarina Saragossi Bruno van Pottelsberghe de la Potterie 《The Journal of Technology Transfer》2003,28(1):47-51
In recent years, there has been a surge in patenting by Belgian universities. It appears that this increase can be attributed to growth of biotechnology, where there is a greater propensity to patent, to a desire on the part of universities to enhance commercialization through technology transfer offices (TTOs), and to effective collaboration between universities and government-sponsored research centers. Our qualitative analysis reveals that patent statistics could be a misleading indicator of an individual university's technological productivity, since many inventions are developed at universities, yet applied by other institutions. 相似文献
100.
Relatively few studies have addressed age patterns of suicide using specifically designed and systematized approaches. Our main objective was to identify and characterize age patterns of suicide in Europe, both on cross-sectional and longitudinal perspectives, based on data comprising the two last decades of the 20th century. A second objective was to determine whether some analytical methods could be useful as complementary approaches to the traditional examination of age-specific rate curves. We identified and characterized four patterns: upward-sloping, convex, downward-sloping, and uniform. The first three reproduce patterns previously described, though we propose some modifications to the respective classification criteria. Longitudinally, pattern stability was found for most countries, but some notable exceptions were detected. From the computation of multiple-decrement life tables by European country, period, and gender, we derived cumulative distributions of age at death for suicide. The results indicate that this methodology is a useful tool, not only for describing and summarizing information, but, more importantly, for providing a better understanding of intrinsic features and complexities of the patterns. Finally, we discuss practical implications of the study in the context of previous theories linking age patterns of suicide to sociological and economic dimensions, and we raise a few questions and hypotheses to be addressed in future research. 相似文献