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排序方式: 共有921条查询结果,搜索用时 15 毫秒
871.
Bradley MJ Keagy RL Lowe PC Rickenbach MP Wright DM Lebeau MA 《Journal of forensic sciences》2006,51(3):504-508
Fracture matches are considered to be the strongest association achievable in forensic examinations of glass, metal, wood, plastic, paint, tape, and other trace evidence. Despite being fairly routine examinations, few publications exist to support their admissibility in court. This study was designed, using duct tape as the fractured medium, to determine the validity and error rate associated with conducting end match (fracture match) examinations on this material. Five test designs, which varied either the source roll of tape or manner of separation (torn or cut) from the roll, were administered to four analysts with instructions to examine the assigned test sets for end matches. If an end match was not identified by the initial analyst, the entire test set was independently evaluated by the remaining three analysts. Results indicated that while tape grade did not hinder end match identification, the manner of separation could affect results. 相似文献
872.
Budowle B Adamowicz M Aranda XG Barna C Chakraborty R Cheswick D Dafoe B Eisenberg A Frappier R Gross AM Ladd C Lee HS Milne SC Meyers C Prinz M Richard ML Saldanha G Tierney AA Viculis L Krenke BE 《Forensic science international》2005,150(1):1-15
A total of 2443 male individuals, previously typed for the 13 CODIS STR loci, distributed across the five North American population groups African American, Asian, Caucasian, Hispanic, and Native American were typed for the Y-STR loci DYS19, DYS385a/b, DYS389I/II, DYS390, DYS391, DYS392, DYS393, DYS437, DYS438 and DYS439 using the PowerPlex Y System. All population samples were highly polymorphic for the 12 Y-STR loci with the marker DYS385a/b being the most polymorphic across all sample populations. The Native American population groups demonstrated the lowest genetic diversity, most notably at the DYS393 and DYS437 loci. Almost all of the 12-locus haplotypes observed in the sample populations were represented only once in the database. Haplotype diversities were greater than 99.6% for the African Americans, Caucasians, Hispanics, and Asians. The Native Americans had the lowest haplotype diversities (Apaches, 97.0%; Navajo, 98.1%). Population substructure effects were greater for Y-haplotypes, compared with that for the autosomal loci. For the apportionment of variance for the 12 Y-STRs, the within sample population variation was the largest component (>98% for each major population group and approximately 97% in Native Americans), and the variance component contributed by the major population groups was less than the individual component, but much greater than among sample populations within a major group (11.79% versus 1.02% for African Americans/Caucasians/Hispanics and 15.35% versus 1.25% for all five major populations). When each major population is analyzed individually, the R(ST) values were low but showed significant among group heterogeneity. In 692 confirmed father-son pairs, 14 mutation events were observed with the average rate of 1.57x10(-3)/locus/generation (a 95% confidence bound of 0.83x10(-3) to 2.69x10(-3)). Since the Y-STR loci reside on the non-recombining region of the Y chromosome, the counting method is one approach suggested for conveying an estimate of the rarity of the Y-haplotype. Because the Y-STR loci are not all in disequilibrium to the same extent, the counting method is a very conservative approach. The data also support that autosomal STR frequencies can be multiplied by the upper bound frequency estimate of a Y-haplotype in the individual population group or those pooled into major population groups (i.e., Caucasian, African American, Hispanic, and Asian). These analyses support use of the haplotype population data for estimating Y-STR profile frequencies for populations residing in North America. 相似文献
873.
Some institutional structures for inquiry produce better approximations to truth than others. The current institutional structure
of police forensics gives each lab a monopoly in the analysis of the police evidence it receives. Forensic workers have inadequate
incentives to produce reliable analyses of police evidence. Competition would create such incentives. I outline a system of
“competitive self regulation” for police forensics.Each jurisdiction would have several competing forensic labs. Evidence
would be divided and sent to one, two, or three separate labs.Chance would determine which labs and how many would receive
evidence to analyze.Competitive selfregulation improves forensics by creating incentives for error detection and reducing
incentives to produce biased analyses.
JEL Classification: K14, K42, H11 相似文献
874.
Using the state and its resources has constituted a vital formof consolidating power for Africas rulers. However, donor-sponsoredreforms have threatened to curtail the opportunities of Africanleaders to maintain their regimes in power. Donor reforms introducedunder structural adjustment programmes have sought to reducethe size and scope of government as well as to cut state spendingand thereby curb the possibilities of state patronage. Reformshave also attempted to contain corruption and improve stategovernance. In Uganda, however, the relationship between donorsand the government has reproduced patronage government. Thedonors have hailed Uganda as a major case of economic successin Africa. They have provided it with large amounts of financialassistance to support the implementation of reforms. High levelsof foreign aid have provided the government with public resourcesto sustain the patronage basis of the regime. Moreover, in acontext where wide discretionary authority was conferred ongoverning elites in the implementation of reforms, public resourcescould be used in unaccountable and non-transparent ways to helpthe government maintain its political dominance. The donorshave begun to realize belatedly that they have been proppingup a corrupt government in Uganda. 相似文献
875.
876.
877.
Roger Adkins 《公共行政管理与发展》1988,8(4):373-389
The effective implementation of IT initiatives within organizations depends on its degree of acceptance at the national level and its rate of absorption within the focal organization. This paper focuses on the latter by addressing the key issues influencing the capacity of organizations to successfully implement IT initiatives. The various issues are investigated based on a case study approach using examples from Tanzania, and organized into a systems framework by considering the role of the psycho-social, the technical, the structural, the goal and the managerial systems in turn. The conclusion highlights the need of appropriate education if the full benefits of IT are to be harvested. 相似文献
878.
879.
880.
Roger L. Faith 《Public Choice》1991,72(1):23-36
I would like to thank Michael Ormiston, Janet Smith and Scott Smith for several helpful discussions. 相似文献