全文获取类型
收费全文 | 3049篇 |
免费 | 112篇 |
专业分类
各国政治 | 232篇 |
工人农民 | 96篇 |
世界政治 | 418篇 |
外交国际关系 | 194篇 |
法律 | 1137篇 |
中国政治 | 14篇 |
政治理论 | 994篇 |
综合类 | 76篇 |
出版年
2023年 | 10篇 |
2022年 | 10篇 |
2021年 | 24篇 |
2020年 | 48篇 |
2019年 | 57篇 |
2018年 | 97篇 |
2017年 | 85篇 |
2016年 | 105篇 |
2015年 | 60篇 |
2014年 | 76篇 |
2013年 | 452篇 |
2012年 | 97篇 |
2011年 | 99篇 |
2010年 | 74篇 |
2009年 | 83篇 |
2008年 | 110篇 |
2007年 | 133篇 |
2006年 | 98篇 |
2005年 | 126篇 |
2004年 | 115篇 |
2003年 | 98篇 |
2002年 | 93篇 |
2001年 | 75篇 |
2000年 | 75篇 |
1999年 | 58篇 |
1998年 | 49篇 |
1997年 | 48篇 |
1996年 | 51篇 |
1995年 | 46篇 |
1994年 | 41篇 |
1993年 | 35篇 |
1992年 | 43篇 |
1991年 | 48篇 |
1990年 | 45篇 |
1989年 | 41篇 |
1988年 | 35篇 |
1987年 | 19篇 |
1986年 | 24篇 |
1985年 | 25篇 |
1984年 | 24篇 |
1983年 | 22篇 |
1982年 | 31篇 |
1981年 | 38篇 |
1980年 | 28篇 |
1979年 | 13篇 |
1978年 | 14篇 |
1977年 | 11篇 |
1975年 | 12篇 |
1974年 | 12篇 |
1967年 | 7篇 |
排序方式: 共有3161条查询结果,搜索用时 0 毫秒
171.
172.
173.
174.
De Greef S Claes P Mollemans W Loubele M Vandermeulen D Suetens P Willems G 《Journal of forensic sciences》2005,50(6):1282-1288
A mobile and fast, semi-automatic ultrasound (US) system was developed for facial soft tissue depth registration. The system consists of an A-Scan ultrasound device connected to a portable PC with interfacing and controlling software. For 52 cephalometric landmarks, the system was tested for repeatability and accuracy by evaluating intra-observer agreement and comparing ultrasound and CT-scan results on 12 subjects planned for craniofacial surgery, respectively. A paired t-test evaluating repeatability of the ultrasound measurements showed 5.7% (n = 3) of the landmarks being significantly different (p < 0.01). US and CT-scan results showed significant differences (p < 0.01) using a Wilcoxon signed rank test analysis for 11.5% (n = 6) of the landmarks. This is attributed to a difference in the volunteer's head position between lying (CT) and sitting (US). Based on these tests, we conclude that the proposed registration system and measurement protocol allows relatively fast (52 landmarks/20 min), non-invasive, repeatable and accurate acquisition of facial soft tissue depth measurements. 相似文献
175.
Ecke DJ Sampath R Willett P Samant V Massire C Hall TA Hari K McNeil JA Büchen-Osmond C Budowle B 《Journal of forensic sciences》2005,50(6):1380-1385
Infectious microorganisms are important to multiple communities engaged in biodefense and biosecurity, including the agencies responsible for health, defense, law enforcement, agriculture, and drug and food safety. Many agencies have created lists of high priority infectious microorganisms to prioritize research efforts or to formally control the possession and distribution of specific organisms or toxins. However, the biological classification of infectious microorganisms is often complex and ambiguous, leading to uncertainty and confusion for scientists involved in biosecurity work. To address this problem, we created a database, known as the Microbial Rosetta Stone, which resolves many of these ambiguities and includes links to additional information on the microbes, such as gene sequence data and scientific literature. Here we discuss the efforts to coordinate organism names from pathogen lists from various governmental agencies according to biological relatedness and show the overlap of high-priority organisms from multiple agencies. To our knowledge, this is the first comprehensive coordination of pathogens, synonyms, and correct taxonomic names. The organized tables and visual aids are freely available at http://www.microbialrosettastone.com. This website provides a single location where access to information on a broad range of disease-causing organisms and toxins is available to members of the biosecurity community. 相似文献
176.
Timmerman IG Emmelkamp PM 《International journal of offender therapy and comparative criminology》2005,49(5):590-606
The effects of an intramural cognitive-behavioral treatment for forensic inpatients with personality disorders in a high-security hospital were examined. Treatment was aimed at modifying maladaptive coping and social skills, at enhancing social awareness, at reducing egoistic and oppositional behaviors, and at reducing psychological complaints. The patients, who all had committed serious crimes (violence, arson, sexual offences), participated voluntarily in the study. A total of 39 patients started the study, but during the course of the study, several patients dropped out because of several reasons. Patients as a group showed significant improvements over time on psychopathological symptoms, personality traits, and coping. A significant decrease of oppositional behaviors was reported by the staff. Though the patients improved well at the group level, only a minority of patients showed reliable change over time at the individual level. The meaning of the results in relation to treatment are discussed. 相似文献
177.
Bill M Gill P Curran J Clayton T Pinchin R Healy M Buckleton J 《Forensic science international》2005,148(2-3):181-189
Several years ago, a theory to interpret mixed DNA profiles was proposed that included a consideration of peak area using the method of least squares. This method of mixture interpretation has not been widely adopted because of the complexity of the associated calculations. Most reporting officers (RO) employ an experience and judgement based approach to the interpretation of mixed DNA profiles. Here we present an approach that has formalised the thinking behind this experience and judgement. This has been written into a computer program package called PENDULUM. The program uses a least squares method to estimate the pre-amplification mixture proportion for two potential contributors. It then calculates the heterozygous balance for all of the potential sets of genotypes. A list of "possible" genotypes is generated using a set of heuristic rules. External to the programme the candidate genotypes may then be used to formulate likelihood ratios (LR) that are based on alternative casework propositions. The system does not represent a black box approach; rather it has been integrated into the method currently used by the reporting officers at the Forensic Science Service (FSS). The time saved in automating routine calculations associated with mixtures analysis is significant. In addition, the computer program assists in unifying reporting processes, thereby improving the consistency of reporting. 相似文献
178.
179.
180.