全文获取类型
收费全文 | 904篇 |
免费 | 15篇 |
专业分类
各国政治 | 63篇 |
工人农民 | 34篇 |
世界政治 | 68篇 |
外交国际关系 | 94篇 |
法律 | 387篇 |
中国政治 | 8篇 |
政治理论 | 244篇 |
综合类 | 21篇 |
出版年
2023年 | 5篇 |
2021年 | 4篇 |
2020年 | 5篇 |
2019年 | 4篇 |
2018年 | 10篇 |
2017年 | 22篇 |
2016年 | 29篇 |
2015年 | 19篇 |
2014年 | 13篇 |
2013年 | 149篇 |
2012年 | 18篇 |
2011年 | 33篇 |
2010年 | 20篇 |
2009年 | 22篇 |
2008年 | 26篇 |
2007年 | 28篇 |
2006年 | 39篇 |
2005年 | 43篇 |
2004年 | 37篇 |
2003年 | 42篇 |
2002年 | 33篇 |
2001年 | 16篇 |
2000年 | 19篇 |
1999年 | 22篇 |
1998年 | 14篇 |
1997年 | 16篇 |
1996年 | 15篇 |
1995年 | 12篇 |
1994年 | 11篇 |
1993年 | 14篇 |
1992年 | 14篇 |
1991年 | 10篇 |
1990年 | 6篇 |
1989年 | 10篇 |
1988年 | 12篇 |
1987年 | 10篇 |
1986年 | 18篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 11篇 |
1982年 | 7篇 |
1981年 | 10篇 |
1980年 | 4篇 |
1979年 | 6篇 |
1978年 | 6篇 |
1977年 | 5篇 |
1975年 | 6篇 |
1974年 | 5篇 |
1970年 | 5篇 |
1969年 | 3篇 |
排序方式: 共有919条查询结果,搜索用时 15 毫秒
11.
12.
13.
Bruce Russett 《国际研究展望》2005,6(4):395-408
The invasion of Iraq has been justified, ex post , as for the purpose of promoting the democratic peace. It does not, however, appear to have been a principal goal ex ante . Most democratic peace theorists, moreover, do not endorse democratic regime change by great-power external military intervention. Success is difficult to achieve (usually at high cost), and the conditions in Iraq were not promising even had the occupation been carried out more competently. Greater success in democratization has been achieved by UN peacekeeping operations, and by various regional international organizations using a variety of peaceful measures to ensure free elections, constrain authoritarian leaders, and empower democratic forces. International organizations, notably those whose membership is largely composed of democracies, are especially likely to succeed in promoting democracy. 相似文献
14.
Jennings B 《Florida law review》2003,55(5):1241-1256
15.
Marian C Anghel A Bel SM Ferencz BK Ursoniu S Dressler M Popescu O Budowle B 《Forensic science international》2007,170(1):73-75
Allele frequencies for the 15 tetranucleotide short tandem repeat loci contained in the AmpFlSTR Identifiler kit were obtained from a population sample of 219 unrelated individuals born in the western part of Romania. 相似文献
16.
Ushtana Antia M.Sc. Malcolm D. Tingle Ph.D. Bruce R. Russell Ph.D. 《Journal of forensic sciences》2010,55(5):1311-1318
Abstract: An LC–MS method was developed for benzylpiperazine (BZP) and trifluoromethylphenylpiperazine (TFMPP), constituents of “party pills” or “legal herbal highs,” and their metabolites in human blood plasma. Compounds were resolved using a mixture of ammonium formate (pH 4.5, 0.01 M) and acetonitrile (flow rate of 1.0 mL/min) with a C18 column. Calibration curves were linear from 1 to 50 ng/mL (R2 > 0.99); the lower limit of quantification (LLOQ) was 5 ng/mL; the accuracy was >90%; the intra‐ and interday relative standard deviations (R.S.D) were <5% and <10%, respectively. Human plasma concentrations of TFMPP were measured in blood samples taken from healthy adults (n = 6) over 24 h following a 60‐mg oral dose of TFMPP: these peaked at 24.10 ng/mL (±1.8 ng/mL) (Cmax) after 90 min (Tmax). Plasma concentrations of 1‐(3‐trifluoromethyl‐4‐hydroxyphenyl) piperazine peaked at 20.2 ng/mL (±4.6 ng/mL) after 90 min. TFMPP had two disposition phases (t½ = 2.04 h (±0.19 h) and 5.95 h (±1.63 h). Apparent clearance (Cl/F) was 384 L/h (±45 L/h). 相似文献
17.
Six ninhydrin analogues containing oxygen, sulfur, and selenium substituents at the C-5 position, 5-(4-nitrophenyl)ninhydrin, and benzo[f]furoninhydrin were evaluated as fingerprint development reagents. The analogues all showed good fingerprint color development but were not superior to ninhydrin in this respect. The benzo[f]furoninhydrin complex was strongly luminescent at room temperature following zinc complexation, while the remaining analogues required cooling to -196 degrees C to produce optimum luminescence. The benzo[f]furo, nitrophenyl, and methyl selenide analogues showed the best potential as fingerprint reagents with the benzo[f]furo analogue comparing favorably with DFO. 相似文献
18.
In this study, we randomly assigned 123 sixth and seventh grade classrooms from seven middle schools in the greater Cleveland
area to one of two five-session curricula addressing gender violence/sexual harassment (GV/SH) or to a no-treatment control
group. A baseline survey and two follow-up surveys were administered immediately after the treatment (Wave 2) and about six
months post-treatment (Wave 3). In an earlier paper, we demonstrated the effectiveness of two approaches to youth GV/SH prevention
programming (a fact-based, law and justice curriculum and an interaction-based curriculum). In this paper, we explored whether
these largely positive findings remain for both girls and boys, including whether girls experience higher levels of GV/SH
than boys. Most of our statistical models proved to be non-statistically significant. However, in 2 of our 48 victimization/perpetration
(any violence, sexual violence and non-sexual violence) models (across two post-intervention follow-up points), we observed
that the interventions reduced peer (male or female, non-dating partner) sexual violence victimization and reduced peer perpetration,
but another outcome model indicated that the interventions increased dating perpetration. These mixed findings will need to
be explored further in future research. Regarding our primary research question, we observed no statistically significant
differences for the treatment multiplied by gender interaction terms for any of the perpetration or victimization outcome
models, suggesting that the treatment had similar effects on girls and boys. However, we did observe that boys are more involved
in violence than girls: both as victims and perpetrators. Boys experienced significantly more of three types of victimization
from peers and dating partners compared to what girls experienced at the hands of their peers and dating partners. As perpetrators,
boys committed more sexual victimization against peers (immediately post-intervention only) and more sexual victimization
against dating partners than girls. The implications of these results are discussed. 相似文献
19.
Amanda B. Hepler Bruce S. Weir 《Forensic Science International: Genetics Supplement Series》2008,2(3):166-175
This study extends the current use of Bayesian networks by incorporating the effects of allelic dependencies in paternity calculations. The use of object-oriented networks greatly simplify the process of building and interpreting forensic identification models, allowing researchers to solve new, more complex problems. We explore two paternity examples: the most common scenario where DNA evidence is available from the alleged father, the mother and the child; a more complex case where DNA is not available from the alleged father, but is available from the alleged father’s brother. Object-oriented networks are built, using HUGIN, for each example which incorporate the effects of allelic dependence caused by evolutionary relatedness. 相似文献
20.
Empirical tests of association between Y chromosome and autosomal markers are presented and a theoretical framework for determining a joint match probability is recommended. Statistical analyses of association were performed in 16 US populations between the autosomal genotypes from loci CSF1PO, FGA, THO1, TPOX, vWA, D3S1358, D5S818, D7S820, D8S1179, D13S317, D16S539, D18S512, D21S11 and Y chromosome haplotypes from loci DYS19, DYS385ab, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393, DYS438, and DYS439. The sample populations include individuals of European-, African-, Hispanic-, Native-, and Asian-American ancestry. The results are consistent with independence of Y and autosomal markers, although small amounts of dependence would likely have escaped our tests. Given the data in hand, we suggest it is appropriate to compute joint match probabilities by multiplying the Y haplotype frequency with the appropriately corrected autosomal frequency. In addition to correcting for autosomal frequency differences between groups, a further correction may be required. Since two individuals sharing the same Y haplotype are likely to be more recently related than two randomly chosen individuals, the autosomal frequencies have to be adjusted to account for this, akin to the theta correction used to account for population substructure. The structure imposed on the autosomal frequencies conditioned in a Y match is a function of the number of markers scored and their mutation rate. However, in most settings theta<0.01. When population structure is already present in the autosomes, the additional effect due to conditioning on the Y is small. For example, if the amount of structure in the population is theta=0.01 or 0.03 (the NRCII range), then the effect of conditioning on the Y results in only a trivial increase in theta to 0.02-0.04, respectively. 相似文献