全文获取类型
收费全文 | 10499篇 |
免费 | 549篇 |
专业分类
各国政治 | 426篇 |
工人农民 | 359篇 |
世界政治 | 812篇 |
外交国际关系 | 307篇 |
法律 | 7080篇 |
中国共产党 | 1篇 |
中国政治 | 54篇 |
政治理论 | 1969篇 |
综合类 | 40篇 |
出版年
2021年 | 62篇 |
2020年 | 193篇 |
2019年 | 233篇 |
2018年 | 233篇 |
2017年 | 294篇 |
2016年 | 298篇 |
2015年 | 248篇 |
2014年 | 269篇 |
2013年 | 996篇 |
2012年 | 234篇 |
2011年 | 305篇 |
2010年 | 287篇 |
2009年 | 300篇 |
2008年 | 285篇 |
2007年 | 258篇 |
2006年 | 275篇 |
2005年 | 250篇 |
2004年 | 249篇 |
2003年 | 233篇 |
2002年 | 237篇 |
2001年 | 462篇 |
2000年 | 418篇 |
1999年 | 291篇 |
1998年 | 181篇 |
1997年 | 147篇 |
1996年 | 123篇 |
1995年 | 117篇 |
1994年 | 144篇 |
1993年 | 131篇 |
1992年 | 196篇 |
1991年 | 217篇 |
1990年 | 203篇 |
1989年 | 214篇 |
1988年 | 205篇 |
1987年 | 190篇 |
1986年 | 231篇 |
1985年 | 206篇 |
1984年 | 159篇 |
1983年 | 169篇 |
1982年 | 112篇 |
1981年 | 121篇 |
1980年 | 85篇 |
1979年 | 131篇 |
1978年 | 74篇 |
1977年 | 73篇 |
1976年 | 69篇 |
1974年 | 73篇 |
1973年 | 66篇 |
1972年 | 66篇 |
1970年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
Eva R. Kimonis Paul J. Frick Jennifer L. Skeem Monica A. Marsee Keith Cruise Luna C. Munoz Katherine J. Aucoin Amanda S. Morris 《International journal of law and psychiatry》2008,31(3):241
The presence of callous–unemotional (CU) traits designates an important subgroup of antisocial youth. To improve upon existing measures, the Inventory of Callous–Unemotional Traits (ICU) was developed to provide an efficient, reliable, and valid assessment of CU traits in samples of youth. The current study tests the factor structure and correlates of the ICU scale in a sample (n = 248) of juvenile offenders (188 boys, 60 girls) between the ages of 12 and 20 (M = 15.47, SD = 1.37). Confirmatory factor analyses are consistent with the presence of three independent factors (i.e., Uncaring, Callousness, and Unemotional) that relate to a higher-order callous–unemotional dimension. Also, CU traits overall showed associations with aggression, delinquency, and both psychophysiological and self-report indices of emotional reactivity. There were some important differences across the three facets of the ICU in their associations with these key external criteria. 相似文献
992.
A novel method for the forensic analysis of commercial petroleum products is presented. In this approach, the petroleum sample is extracted with nitromethane and then separated by capillary liquid chromatography with laser-induced fluorescence detection. The addition of selective fluorescence quenching agents allows the sample to be profiled by the distribution of alternant and nonalternant polycyclic aromatic hydrocarbons (PAHs). In preliminary studies, the quenching behavior of nitromethane and diisopropylamine was established by using a standard mixture of sixteen PAHs ranging in size from two to six aromatic rings. Subsequent examination of new and used motor oil demonstrated that characteristic differences arise in the PAH content, which may allow for the unique identification of oil from a particular engine or vehicle. In addition, three brands of petrolatum jelly were successfully distinguished. Although a number of alternant alkylated and heterocyclic PAHs were found in all petrolatum samples, there were significant differences in the relative concentrations of alternant as well as nonalternant PAHs. This allowed for clear differentiation of the samples through qualitative inspection of their chromatograms as well as quantitative statistical correlation techniques. 相似文献
993.
994.
Myrna S. Austria 《East Asia》2012,29(2):141-156
Why are the ASEAN economies increasingly becoming anxious about regional integration? To stay competitive is an obvious answer. Greater cohesion is also imperative for ASEAN to sustain its credibility of being able to provide the platform for interactions in East Asia and the rest of the world. Yet what is offered by the ASEAN Free Trade Area, the ASEAN Framework Agreement on Services, and the ASEAN Investment Area may not be adequate or comprehensive enough for the Association to amass the economic clout commensurate with its position as a pivotal player in East Asia. The ASEAN Economic Community is thus the logical, but not automatic, extension of these regional efforts. Can it come to fruition? This paper discusses how the ASEAN economies may address key issues that have hampered deeper economic integration in the region. 相似文献
995.
B Karger S P Rand A Duchesne 《The American journal of forensic medicine and pathology》2001,22(4):397-399
In cases of rape leading to fertilization, paternity testing can retrospectively identify the assailant. Abortion material commonly represents a mixture of maternal and fetal tissue and blood, which cannot be differentiated with the naked eye. Consequently, DNA typing of abortion material may be complicated, including band overlap if maternal tissue predominates. Therefore, histology screening of the abortion content for typical fetal tissue components, such as chorionic villi, followed by selected DNA typing of this sample is suggested. This combined approach is illustrated by a selected case demonstrating the reliability and concurrence of the histology and genetic results. 相似文献
996.
997.
Determination of opiates in postmortem bone and bone marrow. 总被引:3,自引:0,他引:3
Bone and bone marrow of a fatally poisoned heroin addict were analyzed by FPIA and GC-FID, immediately after death. A piece of the bone from the above case was buried for 1 year and analyzed by the same procedure. Morphine was detected in all specimens at concentrations of 195, 340 and 155 ng/g for bone marrow, bone and buried bone, respectively. A loss of 54.4% of morphine concentration was observed during 1-year burial. Such findings have potential forensic value in cases of skeletonized remains. 相似文献
998.
An experimental study of the natural sampling of trace signals from explosives concealed upon the human body was performed by taking proper account of the thermal behavior of the air surrounding the human body and the particles therein. Experiments were conducted in a dispersal chamber to identify variables affecting the detectibility of concealed RDX and TNT patches. Movement by human volunteers was found to enhance the available explosive trace signal above a baseline level. Clothing blocked some of this movement-generated trace signal. The detected signal levels were also found to vary significantly from volunteer to volunteer, indicating that human variability is an issue in explosive trace detection. Further, under the conditions studied here, the detectibility of RDX and TNT was dependent upon the efficient sampling of contaminated particulate matter, not the vapor phase. The present results are now being applied to the design of a practical, nonintrusive trace detection portal for aviation security screening and related applications. 相似文献
999.
Pedophiles constitute a heterogeneous group of sex offenders. Direct physiological assessment of sexual arousal has significantly increased our diagnostic skill and capability of monitoring treatment response. Erectile response studies have indicated that the majority of pedophiles and incest offenders show arousal to other paraphilias and frequently to appropriate adult sexual stimuli. Many sexual offenders deny or minimize their problem during initial interviews, but when confronted with laboratory results indicating deviant sexual arousal, they often acknowledge and elaborate on the paraphilia(s). Complete data and diagnoses are crucial in integrating treatment in the cognitive-behavioral paradigm. 相似文献
1000.