全文获取类型
收费全文 | 7105篇 |
免费 | 476篇 |
专业分类
各国政治 | 335篇 |
工人农民 | 221篇 |
世界政治 | 466篇 |
外交国际关系 | 231篇 |
法律 | 5012篇 |
中国政治 | 34篇 |
政治理论 | 1247篇 |
综合类 | 35篇 |
出版年
2020年 | 156篇 |
2019年 | 166篇 |
2018年 | 177篇 |
2017年 | 207篇 |
2016年 | 210篇 |
2015年 | 196篇 |
2014年 | 180篇 |
2013年 | 737篇 |
2012年 | 154篇 |
2011年 | 168篇 |
2010年 | 205篇 |
2009年 | 223篇 |
2008年 | 163篇 |
2007年 | 159篇 |
2006年 | 167篇 |
2005年 | 158篇 |
2004年 | 177篇 |
2003年 | 156篇 |
2002年 | 137篇 |
2001年 | 309篇 |
2000年 | 250篇 |
1999年 | 226篇 |
1998年 | 97篇 |
1997年 | 64篇 |
1996年 | 70篇 |
1995年 | 79篇 |
1994年 | 86篇 |
1993年 | 87篇 |
1992年 | 151篇 |
1991年 | 156篇 |
1990年 | 145篇 |
1989年 | 155篇 |
1988年 | 122篇 |
1987年 | 137篇 |
1986年 | 124篇 |
1985年 | 132篇 |
1984年 | 101篇 |
1983年 | 116篇 |
1982年 | 82篇 |
1981年 | 78篇 |
1980年 | 55篇 |
1979年 | 108篇 |
1978年 | 71篇 |
1977年 | 58篇 |
1976年 | 50篇 |
1975年 | 47篇 |
1974年 | 55篇 |
1973年 | 56篇 |
1972年 | 44篇 |
1968年 | 40篇 |
排序方式: 共有7581条查询结果,搜索用时 15 毫秒
201.
Habiba Sultana D. B. Subedi 《International Journal of Politics, Culture, and Society》2016,29(1):19-32
This paper studies Hindu untouchable sweepers of Bangladesh, using a case study of two sweeper communities in Dhaka city. Due to their untouchability, Hindu sweepers in Bangladesh have historically been subjected to discrimination and marginalisation, and are deprived of choices such as free selection of occupation, access to housing, education and other benefits. Contending with the conventional notion that Hinduism maintains social order by caste hierarchies and divisions of labour, this shows how the sweepers of Dhaka city respond to the notion of untouchability and show resistance to caste discrimination. This paper also argues that it is not only a Hindu religious ideology but also historical, colonial, economic, political and social aspects of caste-based discrimination that can explain construction of the notion of Dalit and the marginalisation and resistance of Bangladeshi sweepers. 相似文献
202.
203.
204.
205.
B. C. SMITH 《公共行政管理与发展》1996,16(2):163-178
To identify what is needed to sustain local democracy we need a model of democratic government and an idea of the kind of social and economic context that is supportive of democracy. Local democracy requires a combination of a liberal democratic model of local government and the prerequisites of democratic stability: economic development, equality, political culture and the development of civil society. However, a number of factors, non-local as well as local, may undermine local government and local democracy, especially centralization, economic decisions, external conflicts, dependency on civil servants, the dilution of elected representation, formalistic participation, skewed representation, class conflict and official attitudes. However, democratic local government can contribute to economic development, the reduction of inequality, a democratic political culture and the development of civil society, thereby strengthening local democracy. 相似文献
206.
Folk Johanna B. Brown Larry K. Marshall Brandon D. L. Ramos Lili M. C. Gopalakrishnan Lakshmi Koinis-Mitchell Daphne Tolou-Shams Marina 《Journal of youth and adolescence》2020,49(1):238-251
Journal of Youth and Adolescence - Court-involved youth exhibit high rates of psychiatric symptoms, substance use, and delinquency, yet little is known about the contributing roles of caregiver and... 相似文献
207.
Hari Jang M.S. Sang Eon Shin Ph.D. Kyu Jin Youm B.S. Mustafa Zafer Karagozlu Ph.D. Chang Bae Kim Ph.D. Kwang Soo Ko M.S. Seong Hwan Park M.D. Ph.D. 《Journal of forensic sciences》2020,65(1):283-287
Species identification of necrophagous insects found on a dead body is an essential key in applying medicolegal entomology to the estimation of postmortem interval (PMI). Due to limited morphological identification of insect evidence, several studies have identified species using molecular information such as DNA markers. While considerable cytochrome c oxidase subunit I (COI) gene sequence data of necrophagous fly species have been collected and annotated, those of necrophagous beetle species have not. Since necrophagous beetles such as Dermestes species have a larval period longer than that of flies, beetles are useful in even the late decomposition phase in estimating minimum PMI. To obtain the full-length COI gene sequences of six Dermestes species collected from South Korea, we designed primers for polymerase chain reaction amplification and sequencing. The obtained full COI nucleotide sequences were used for performing phylogenic analysis and comparison with previously reported sequences. The results demonstrated that the COI gene sequences could be used to identify forensically important Dermestes species in South Korea. 相似文献
208.
Terezie Cernosek B.S. Kevin E. Eckert M.Sc. David O. Carter Ph.D. Katelynn A. Perrault Ph.D. 《Journal of forensic sciences》2020,65(1):134-143
Volatile organic compounds (VOCs) are by-products of cadaveric decomposition and are responsible for the odor associated with decomposing remains. The direct link between VOC production and individual postmortem microbes has not been well characterized experimentally. The purpose of this study was to profile VOCs released from three postmortem bacterial isolates (Bacillus subtilis, Ignatzschineria indica, I. ureiclastica) using solid-phase microextraction arrow (SPME Arrow) and gas chromatography–mass spectrometry (GC-MS). Species were inoculated in headspace vials on Standard Nutrient Agar and monitored over 5 days at 24°C. Each species exhibited a different VOC profile that included common decomposition VOCs. VOCs exhibited upward or downward temporal trends over time. Ignatzschineria indica produced a large amount of dimethyldisulfide. Other compounds of interest included alcohols, aldehydes, aromatics, and ketones. This provides foundational data to link decomposition odor with specific postmortem microbes to improve understanding of underlying mechanisms for decomposition VOC production. 相似文献
209.
Ju Yeon Jung M.S. Ga Hee Ryu B.S. Da-Hye Kim B.S. Joo-Young Kim Ph.D. In Kwan Hwang Ph.D. Pil-Won Kang Ph.D. Byung Won Chun Ph.D. Seong Yeon Yoo Ph.D. 《Journal of forensic sciences》2020,65(1):209-213
When using non-FTA cards in commercial multiplex STR kits for direct PCR, pretreatment steps with specific buffers are recommended. Here, we designed a rapid direct PCR method utilizing a non-FTA card, Oral Cell Sampling Kit, by omitting the pretreatment step involving Prep-n-Go™ Buffer, and it showed compatibility with the GlobalFiler™ Express PCR Amplification Kit, GlobalFiler™ PCR Amplification Kit, and PowerPlex® Fusion system. To optimize the PCR conditions, we tested the method with different final PCR volumes and cycles. Finally, we conducted a performance test using 50 Korean buccal samples and confirmed the high performance of the method, detecting more than 90% of the samples with full profiles when using GlobalFiler™ PCR Amplification Kit and PowerPlex® Fusion system at 29 cycles in a 10 μL final PCR volume. Thus, we report a simple direct PCR set-up to analyze reference samples collected using a non-FTA card manufactured in Korea. 相似文献
210.
Youngmin Kim M.S. Won-sil Choi Ph.D. Byoungjun Jeon B.S. Tae Hyun Choi M.D. Ph.D. 《Journal of forensic sciences》2020,65(2):458-464
Cholesterol and squalene are fatty materials of latent fingermarks that can be utilized for dating methodologies and visualization techniques. Previous studies have suggested these compounds undergo degradation in fingermarks as a function of time (days) and light at ambient temperature. However, studies assessing how their composition changes at low and high temperatures over short periods of time (hours) have not been published previously. Here, we performed quantitative analysis of cholesterol and squalene in natural fingermark residue using PVDF membrane, after exposure to a range of temperatures (−20 to 100°C) for 4 and 8 h. We found that levels of both fatty materials remained constant at −20 to 60°C, but both showed significant reduction at 100°C, over short exposure times. These results indicate that cholesterol and squalene are detectable at −20 to 60°C, whereas at 100°C or higher, both are lost due to rapid thermal degradation. 相似文献