全文获取类型
收费全文 | 3498篇 |
免费 | 106篇 |
国内免费 | 3篇 |
专业分类
各国政治 | 130篇 |
工人农民 | 126篇 |
世界政治 | 160篇 |
外交国际关系 | 246篇 |
法律 | 1348篇 |
中国共产党 | 139篇 |
中国政治 | 313篇 |
政治理论 | 458篇 |
综合类 | 687篇 |
出版年
2023年 | 18篇 |
2022年 | 29篇 |
2021年 | 51篇 |
2020年 | 80篇 |
2019年 | 56篇 |
2018年 | 81篇 |
2017年 | 78篇 |
2016年 | 79篇 |
2015年 | 85篇 |
2014年 | 118篇 |
2013年 | 312篇 |
2012年 | 138篇 |
2011年 | 188篇 |
2010年 | 264篇 |
2009年 | 232篇 |
2008年 | 226篇 |
2007年 | 233篇 |
2006年 | 256篇 |
2005年 | 212篇 |
2004年 | 131篇 |
2003年 | 111篇 |
2002年 | 107篇 |
2001年 | 86篇 |
2000年 | 50篇 |
1999年 | 41篇 |
1998年 | 16篇 |
1997年 | 23篇 |
1996年 | 19篇 |
1995年 | 29篇 |
1994年 | 22篇 |
1993年 | 17篇 |
1992年 | 28篇 |
1991年 | 24篇 |
1990年 | 14篇 |
1989年 | 12篇 |
1988年 | 10篇 |
1987年 | 12篇 |
1986年 | 12篇 |
1985年 | 12篇 |
1984年 | 9篇 |
1983年 | 11篇 |
1982年 | 7篇 |
1981年 | 12篇 |
1979年 | 4篇 |
1978年 | 9篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1974年 | 5篇 |
1972年 | 4篇 |
1967年 | 5篇 |
排序方式: 共有3607条查询结果,搜索用时 15 毫秒
131.
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
132.
Charlotte Murphy Ph.D. June Kenna M.Sc. Lorna Flanagan Ph.D. Marce Lee Gorman B.Sc. Clara Boland Ph.D. Jennifer Ryan Ph.D. 《Journal of forensic sciences》2020,65(2):399-405
This study is the first to examine the background level of male DNA on underpants worn by females in the absence of sexual contact. Here, we examined 103 samples from the inside front of underpants from 85 female volunteers. Samples were examined for the presence of male DNA using NGM SElect and PowerPlex Y23 kits. Only five samples gave a “complete” Y-STR profile, even though 83.5% of our volunteers cohabited with a male. In all cases where a partner reference sample was available, the Y-STR profile matched the cohabiting partner. We have demonstrated that a Y-STR profile is not expected on the inside front of underpants worn by females after social contact alone. The results of this study are informative for evaluating the significance of a Y-STR profile on underpants in cases of alleged sexual assault. 相似文献
133.
Minji Lee M.S. Ju Yeon Jung M.S. Sungsoo Choi M.S. Ilung Seol Ph.D. Seohyun Moon Ph.D. In Kwan Hwang Ph.D. 《Journal of forensic sciences》2020,65(6):2117-2120
Lophophora is a member of the Cactaceae family, which contains two species: Lophophora williamsii and L. diffusa. Lophophora williamsii is an illegal plant containing mescaline, a hallucinogenic alkaloid. In this study, a novel method based on a single nucleotide polymorphism (SNP) assay was developed for identifying L. williamsii; this assay reliably detects SNPs within chloroplast DNA (rbcL, matK, and trnL-trnF IGS) and was validated for identifying Lophophora and L. williamsii simultaneously. The chloroplast DNA sequences from four L. williamsii and three L. diffusa plants were obtained and compared using DNA sequence data from approximately 300 other Cactaceae species available in GenBank. From this sequence data, a total of seven SNPs were determined to be suitable for identifying L. williamsii. A multiplex assay was constructed using the ABI PRISM® SNaPshot™ Multiplex Kit (Applied Biosystems, Forster City, CA) to analyze species-specific SNPs. Using this multiplex assay, we clearly distinguished the Lophophora among 19 species in the Cactaceae family. Additionally, L. williamsii was distinguished from L. diffusa. These results suggest that the newly developed assay may help resolve crimes related to illegal distribution and use. This multiplex assay will be useful for the genetic identification of L. williamsii and can complement conventional methods of detecting mescaline. 相似文献
134.
Jong-Hyun Choi M.S. Jungheum Park Ph.D. Sangjin Lee Ph.D. 《Journal of forensic sciences》2020,65(3):966-973
Network-attached storage (NAS) is a system that uses a redundant array of disks (RAID) to create virtual disks comprising multiple disks and provide network services such as FTP, SSH, and WebDAV. Using these services, the NAS's virtual disks store data about individuals or groups, making them a critical analysis target for digital forensics. Well-known storage manufacturers like Seagate, Synology, and NETGEAR use Linux-based software RAID, and they usually support Berkeley RAID (e.g., RAID 0, 1, 5, 6, and 10) as well as self-developed hybrid RAID. Those manufacturers have published data on the introduction and features of hybrid RAID, but there is not enough information to reassemble RAID from a digital forensic perspective. Besides, digital forensic tools (such as EnCase, FTK, X-ways, and RAID Reconstructor) do not support automatic RAID reassembly for hybrid RAID, so research on hybrid RAID reassembly methods is necessary. This paper analyzes the disk array composed of hybrid RAID and explains the layout of disk array, partition layout in hybrid RAID, and hybrid RAID configuration strategy. Furthermore, it suggests parameters that are required for RAID reassembly and then propose a hybrid RAID reassembly procedure using them. Finally, we propose a proof-of-concept tool (Hybrid RAID Reconstructor) that identifies hybrid RAID from disk array and parse RAID parameters. 相似文献
135.
Yoonsun Choi Michael Park Jeanette Park Lee Miwa Yasui Tae Yeun Kim 《Journal of youth and adolescence》2018,47(10):2181-2205
Acculturation strategy, a varying combination of heritage and mainstream cultural orientations and one of the significant determinants of youth development, has been understudied with Asian American youth and particularly at a subgroup-specific level. This study used person-oriented latent profile analysis (LPA) to identify acculturation strategy subtypes among Filipino American and Korean American adolescents living in the Midwest. Associations between the subtypes and numerous correlates including demographics, family process and youth outcomes were also examined. Using large scale survey data (N?=?1580; 379 Filipino American youth and 377 parents, and 410 Korean American youth and 414 parents; MAGE of youth?=?15.01), the study found three acculturation subtypes for Filipino American youth: High Assimilation with Ethnic Identity, Integrated Bicultural with Strongest Ethnic Identity, and Modest Bicultural with Strong Ethnic Identity; and three acculturation subtypes for Korean American youth: Separation, Integrated Bicultural, and Modest Bicultural with Strong Ethnic Identity. Both Filipino American and Korean American youth exhibited immersion in the host culture while retaining a strong heritage identity. Although bicultural strategies appear most favorable, the results varied by gender and ethnicity, e.g., integrated bicultural Filipino Americans, comprised of more girls, might do well at school but were at risk of poor mental health. Korean American separation, comprised of more boys, demonstrated a small but significant risk in family process and substance use behaviors that merits in-depth examination. The findings deepen the understanding of heterogeneous acculturation strategies among Asian American youth and provide implications for future research. 相似文献
136.
Esther S. Chang Jutta Heckhausen Ellen Greenberger Chuansheng Chen 《Journal of youth and adolescence》2010,39(11):1293-1304
This study proposed and confirmed three ways in which college students can perceive shared agency and two ways in which they can perceive non-shared agency with parents when pursuing educational goals in college. Differences and similarities were examined among participants
from four ethnic backgrounds (N = 515; 67% female): East Asian American, Southeast Asian American, Filipino/Pacific Islander American, and European American.
Results indicated that Asian American youth reported higher levels of non-shared agency with parents (i.e., parental directing
and noninvolvement), lower levels of shared agency (i.e., parental accommodation, support, or collaboration), and poorer college
adjustment compared to European Americans. However, ethnic similarities were found whereby perceived shared agency in education
with parents was associated with college adjustment. Multiple mediation analyses also indicated that our model of shared and
non-shared agency with parents explained differences in college adjustment between Asian and European Americans, though more
strongly for comparisons between European and East Asian Americans. Our results suggest that parents continue to be important
in the education of older youth but that continued directing of youth’s education in college can be maladaptive. 相似文献
137.
Hyeouk Chris Hahm Yoona Lee Al Ozonoff Michael J. Van Wert 《Journal of youth and adolescence》2010,39(5):528-540
The purpose of this study was to investigate how different types of child maltreatment, independently and collectively, impact
a wide range of risk behaviors that fall into three domains: sexual risk behaviors, delinquency, and suicidality. Cumulative
classification and Expanded Hierarchical Type (EHT) classification approaches were used to categorize various types of maltreatment.
Data were derived from Wave III of the National Longitudinal Study of Adolescent Health (Add Health). Our sample consisted
of White, Black, Hispanic, and Asian females ages 18 to 27 (n = 7,576). Experiencing different kinds of maltreatment during childhood led to an extensive range of risk behaviors within
the three identified domains. Women experiencing sexual abuse plus other maltreatment types had the poorest outcomes in all
three domains. These findings illustrate that it may no longer be appropriate to assume that all types of maltreatment are
equivalent in their potential contribution to negative developmental sequelae. 相似文献
138.
Latinas in the United States are at a disproportionate risk for STDs and sexual risk behaviors. Among Latinas, acculturation
has been found to be one of the most important predictors of these behaviors. Therefore, this study examined the longitudinal
association between Latina adolescents’ level of acculturation and multiple sexual risk outcomes, including self-report STD
diagnosis, four or more life-time sex partners, regret of sexual initiation after alcohol use, and lack of condom use during
young adulthood. Based on the National Longitudinal Study of Adolescent Health (Add Health), this study includes a nationally
representative sample of 1,073 Latina adolescents (ages 11–20 at Wave 1) transitioning into young adulthood (ages 18–27 at
Wave 3). Our findings indicate that more acculturated Latinas who spoke English at home were more likely to have STDs and
to exhibit sexual risk behaviors than Latinas who were foreign-born and did not use English at home. Interventions that aim
to promote sexual and reproductive health among young Latinas should take into consideration their different levels of acculturation.
This approach holds greater potential for reducing health disparities among Latinas. 相似文献
139.
以"党委领导、校长行政、教授治学、民主管理"为特征的现代大学制度逐步形成与完善.相应地存在于大学内部的政治权力、行政权力、学术权力、民主管理权力共同作用于大学管理中.应围绕制度建设、创新形式、完善机制和提高能力等方面强化民主管理权力. 相似文献
140.
Roger Dunston Alison Lee David Boud Pat Brodie Mary Chiarella 《Australian Journal of Public Administration》2009,68(1):39-52
There is growing interest in the application of citizen participation within all areas of public sector service development, where it is increasingly promoted as a significant strand of post-neoliberal policy concerned with re-imagining citizenship and more participatory forms of citizen/consumer engagement. The application of such a perspective within health services, via co-production, has both beneficial, but also problematic implications for the organisation of such services, for professional practice and education. Given the disappointing results in increasing consumer involvement in health services via 'choice' and 'voice' participation strategies, the question of how the more challenging approach of co-production will fare needs to be addressed. The article discusses the possibilities and challenges of system-wide co-production for health. It identifies the discourse and practice contours of co-production, differentiating co-production from other health consumer-led approaches. Finally, it identifies issues critically related to the successful implementation of co-production where additional theorisation and research are required. 相似文献