全文获取类型
收费全文 | 10846篇 |
免费 | 273篇 |
专业分类
各国政治 | 408篇 |
工人农民 | 386篇 |
世界政治 | 729篇 |
外交国际关系 | 304篇 |
法律 | 6826篇 |
中国政治 | 69篇 |
政治理论 | 2309篇 |
综合类 | 88篇 |
出版年
2020年 | 111篇 |
2019年 | 158篇 |
2018年 | 204篇 |
2017年 | 228篇 |
2016年 | 218篇 |
2015年 | 167篇 |
2014年 | 185篇 |
2013年 | 976篇 |
2012年 | 222篇 |
2011年 | 271篇 |
2010年 | 215篇 |
2009年 | 272篇 |
2008年 | 278篇 |
2007年 | 281篇 |
2006年 | 265篇 |
2005年 | 247篇 |
2004年 | 244篇 |
2003年 | 248篇 |
2002年 | 243篇 |
2001年 | 425篇 |
2000年 | 372篇 |
1999年 | 299篇 |
1998年 | 159篇 |
1997年 | 123篇 |
1996年 | 137篇 |
1995年 | 135篇 |
1994年 | 140篇 |
1993年 | 138篇 |
1992年 | 235篇 |
1991年 | 254篇 |
1990年 | 244篇 |
1989年 | 252篇 |
1988年 | 232篇 |
1987年 | 228篇 |
1986年 | 264篇 |
1985年 | 258篇 |
1984年 | 230篇 |
1983年 | 217篇 |
1982年 | 154篇 |
1981年 | 129篇 |
1980年 | 114篇 |
1979年 | 155篇 |
1978年 | 88篇 |
1977年 | 113篇 |
1976年 | 98篇 |
1975年 | 73篇 |
1974年 | 92篇 |
1973年 | 84篇 |
1972年 | 80篇 |
1971年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
952.
Izabela Z. Schultz Joan M. Crook Jonathan Berkowitz Gregory R. Meloche Kenneth M. Prkachin Catherine M. Chlebak 《Psychological injury and law》2013,6(3):258-276
Low back pain (LBP), a leading cause of disability, has been linked with profound economic, personal, and social costs (Hills 2006; World Health Organization 2003). This significant effect propels research in identifying modifiable risk factors that protract LBP; these factors can be targeted in early intervention (EI) (Pransky, Journal of Occupational & Environmental Medicine, 49(3):249–251, 2007; Schultz et al., Journal of Occupational Rehabilitation, 17:327–352, 2007, Journal of Occupational Rehabilitation, 18(2), 140–151, 2008; White et al. 2013). This randomized controlled study evaluated the effectiveness of two approaches, fixed versus flexible, in delivering proactive, interdisciplinary EI with 63 workers within a workers' compensation interdisciplinary case management setting (i.e., WorkSafeBC, Canada). Off-work 4 to 10 weeks post-back injury, the workers were also at risk of protracted work disability (N?=?24 at high risk; N?=?39 at moderate risk). Fixed, protocol-driven, interdisciplinary, multimodal, clinical, occupational, and case management-based EI was compared with a flexible, individual need-driven EI with the same modalities as the fixed approach. Results showed a significant narrowing of the outcome gap between the two interventions. High-risk injured workers tended to benefit more from a fixed, protocol-driven approach, as shown in the pilot study (Schultz et al. Journal of Occupational Rehabilitation, 18(2), 140–151, 2008). The results indicated that moderate-risk workers benefitted from a more flexible, need-based, individual, and low-intensity approach as compared with a fixed approach. The flexible approach for moderate-risk workers was also less costly and consumed fewer rehabilitation and health care resources. Recommendations for future research and practice included larger sample sizes, controllability of research interventions, risk for disability-EI matching, and conditions under which a flexible delivery of multimodal EI is more efficacious than a fixed approach, and vice versa. 相似文献
953.
Joachim Heinzl Ah-Lian Kor Graham Orange Hans Rüdiger Kaufmann 《The Journal of Technology Transfer》2013,38(5):607-640
The aim of this paper is to present the findings of a PhD research (Heinzl 2007, Unpublished PhD Thesis) conducted on the Universities of Applied Sciences in Austria. Four of the models that emerge from this research are: Generic Technology Transfer Model (Sect. 5.1); Idiosyncrasies Model for the Austrian Universities of Applied Sciences (Sect. 5.2); Idiosyncrasies-Technology Transfer Effects Model (Sect. 5.3); Idiosyncrasies-Technology Transfer Cumulated Effects Model (Sect. 5.3). The primary and secondary research methods employed for this study are: literature survey, focus groups, participant observation, and interviews. The findings of the research contribute to a conceptual design of a technology transfer system which aims to enhance the higher education institutions’ technology transfer performance. 相似文献
954.
955.
956.
957.
This paper explores a popular yet highly destructive form of property crime — graffiti vandalism. The localities of such destruction
selected for study were male and female restrooms. Three hundred and ninety-two cases were collected and analyzed. Prior research
theorized the existence of a significant difference in the amount of graffiti produced between the sexes. (It was believed
that males produce more graffiti than females). Analysis, however, revealed equal production of graffiti by males and females.Content differences between the sexes were hypothesized. The content categories included homosexual, heterosexual, nonsexual (humorous
and political statements) and racial graffiti. The findings as they relate to content differences between the sexes are presented
and discussed relative to sex-role socialization theory. 相似文献
958.
Simon J. Walsh R. John Mitchell Fraser Torpy John S. Buckleton 《Forensic Science International: Genetics Supplement Series》2007,1(3-4):238-246
DNA profiling evidence presented in court should be accompanied by a reliable estimate of its evidential weight. In calculating such statistics, allele frequencies from commonly employed autosomal microsatellite loci are required. These allele frequencies should be collected at a level that appropriately represents the genetic diversity that exists in the population. Typically this occurs at broadly defined bio-geographic categories, such as Caucasian or Asian. Datasets are commonly administered at the jurisdictional level. This paper focuses on Australian jurisdictions and assesses whether this current practice is appropriate for Aboriginal Australian and Caucasian populations alike. In keeping with other studies we observe negligible differences between Caucasian populations within Australia when segregated geographically. However segregation of Aboriginal Australian population data along contemporary State and Territory lines appears to mask the diversity that exists within this subpopulation. For this reason datasets collated along more traditional lines may be more appropriate, particularly to distinguish the most genetically differentiated populations residing in the north of the continent. 相似文献
959.
We describe the forensic science application of a method for quantification of human genomic deoxyribonucleic acid (DNA). The two cases cited in this report involve DNA samples extracted from skin tissue and bloodstained clothing recovered from different crime scenes. High-molecular-weight DNA was recovered from both specimens, and the concentrations of these DNAs were estimated to be approximately 0.5 microgram/microL by ethidium bromide/agarose gel electrophoresis. Using the human-specific DNA probe p17H8 (locus D17Z1) to quantify the amount of human genomic DNA in these samples, it is shown that less than 1% of the DNA isolated from the skin tissue is of human origin and that the DNA isolated from the bloodstained clothing is effectively devoid of human DNA sequences. These case examples illustrate the need to quantify not only the total amount of DNA recovered from forensic casework material, but also the proportion of the DNA that is of human origin. 相似文献
960.
Bite mark analysis involves comparison of individual dental characteristics between a dentition and the bite injury. A bite mark injury may result from sexual assault, or physical assault, and defensive injuries, and as such can be used to link a suspect to a victim or vice versa. Missing teeth are one of the characteristics that could implicate or exclude a suspected biter. However frequency data for use by forensic odontologists can only be collated from epidemiological studies. Therefore an audit was undertaken of missing anterior teeth in adult patients (n = 1010) attending for treatment, gathering data that could be more relevant to odontology. One in five of the sample presented with missing teeth that were either replaced with a denture (11%), not replaced (6%) or missing with the gap closed (2%). 相似文献