全文获取类型
收费全文 | 1575篇 |
免费 | 119篇 |
专业分类
各国政治 | 161篇 |
工人农民 | 103篇 |
世界政治 | 176篇 |
外交国际关系 | 89篇 |
法律 | 870篇 |
中国政治 | 3篇 |
政治理论 | 289篇 |
综合类 | 3篇 |
出版年
2023年 | 23篇 |
2022年 | 16篇 |
2021年 | 37篇 |
2020年 | 53篇 |
2019年 | 64篇 |
2018年 | 96篇 |
2017年 | 133篇 |
2016年 | 97篇 |
2015年 | 72篇 |
2014年 | 86篇 |
2013年 | 238篇 |
2012年 | 74篇 |
2011年 | 66篇 |
2010年 | 30篇 |
2009年 | 31篇 |
2008年 | 52篇 |
2007年 | 52篇 |
2006年 | 53篇 |
2005年 | 56篇 |
2004年 | 58篇 |
2003年 | 63篇 |
2002年 | 47篇 |
2001年 | 39篇 |
2000年 | 26篇 |
1999年 | 18篇 |
1998年 | 12篇 |
1997年 | 18篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 8篇 |
1991年 | 6篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1985年 | 3篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1978年 | 3篇 |
1974年 | 2篇 |
1972年 | 2篇 |
1971年 | 3篇 |
1970年 | 1篇 |
1968年 | 4篇 |
1967年 | 2篇 |
1966年 | 3篇 |
1965年 | 1篇 |
1964年 | 1篇 |
排序方式: 共有1694条查询结果,搜索用时 15 毫秒
141.
Nondestructive Methods for Recovery of Biological Material from Human Teeth for DNA Extraction 下载免费PDF全文
Montserrat Hervella Ph.D. Maitane G. Iñiguez M.Sc. Neskuts Izagirre Ph.D. Alberto Anta Ph.D. Concepción de‐la‐Rúa Ph.D. 《Journal of forensic sciences》2015,60(1):136-141
The extraction of DNA from human skeletal remains applied to forensic, and evolutionary studies do not exclude risks, which are to be evaluated when working with unique specimens that could be damaged or even destroyed. In the present study were evaluated several nondestructive methods for recovering DNA instead of the most currently used pulverization method. Three different procedures to access inside the dental pieces (occlusal perforation, cervical perforation, and cervical cut) have been compared with the aim of recovering as many cell remains as possible to carry out a DNA extraction. Given the DNA quantitation results, a method was proposed that consists of a cervical cut to facilitate the access to the pulp cavity and a subsequent filing of the root canals down to the apex of the dental root. This methodology allows the recovery of both mitochondrial and nuclear DNA, with the minimum deterioration for the dental pieces. 相似文献
142.
Animal Scavenging and Scattering and the Implications for Documenting the Deaths of Undocumented Border Crossers in the Sonoran Desert, 下载免费PDF全文
Jess Beck M.A. Ian Ostericher M.A. Gregory Sollish B.A. Jason De León Ph.D. 《Journal of forensic sciences》2015,60(Z1):S11-S20
Since 1998, over 5500 people have died while attempting to cross the U.S.–Mexico border without authorization. These deaths have primarily occured in the Arizona desert. Despite the high volume of deaths, little experimental work has been conducted on Sonoran Desert taphonomy. In this study, pig carcasses were used as proxies for human remains and placed in different depositional contexts (i.e., direct sunlight and shade) that replicate typical sites of migrant death. Decomposition was documented through daily site visits, motion-sensitive cameras and GIS mapping, while skeletal preservation was investigated through the collection of the remains and subsequent faunal analysis. Our results suggest that vultures and domestic dogs are underappreciated members of the Sonoran scavenging guild and may disperse skeletal remains and migrant possessions over 25 m from the site of death. The impact of scavengers and the desert environment on the decomposition process has significant implications for estimating death rates and identifying human remains along the Arizona/Mexico border. 相似文献
143.
İlhami Kömür M.D. Ahmet Selçuk Gürler M.D. Bünyamin Başpınar M.D. Esat Şahin M.D. Muhammet Nabi Kantarcı M.D. Murat Emül M.D. Eyüp Kandemir M.D. Hacı Mehmet Akın M.D. Hüseyin Bülent Üner Ph.D. 《Journal of forensic sciences》2015,60(6):1613-1619
The aim of this study was to analyze the differences between the handwritings of schizophrenia patients and healthy subjects in addition to the changes that occurred in schizophrenia patients' handwriting in response to the treatment. The test subjects were 29 schizophrenia patients and 29 healthy individuals with the same age, gender, and dominant hand. The changes in the handwritings were examined according to 14 different parameters. On the day of admittance, the percentage of extra letters was 16.7%, and after 7–10 days of hospitalization, it rose to 33.3%. The percentage of skipped words decreased from 29.2% to 16.7% after 7–10 days of hospitalization, and to 10% after 3 weeks. The letters written by schizophrenia patients are significantly larger in height and width compared to the control group. The schizophrenia patients showed a higher incidence of crossed-out letters, adding extra words, missing punctuation as well as missing words. 相似文献
144.
The Application of Flow Cytometry as a Rapid and Sensitive Screening Method to Detect Contamination of Vitreous Humor Samples and Avoid Miscalculation of the Postmortem Interval 下载免费PDF全文
Cristina Cordeiro M.Sc. Rafael Seoane Ph.D. Ana Camba M.Sc. Elena Lendoiro M.Sc. María S. Rodríguez‐Calvo Ph.D. Duarte N. Vieira Ph.D. José I. Muñoz‐Barús Ph.D. 《Journal of forensic sciences》2015,60(5):1346-1349
Research into maximizing the speed, precision, and reliability of estimating the postmortem interval (PMI) has been a recurring object of investigation and methodologies based on the vitreous humor (VH) have provided good results. However, contamination from causes not readily apparent, such as blood, can occur, and thus lead not only to an erroneous estimation of PMI, but also interfere with the correct identification of other substances in the VH. We have developed a flow cytometry method which quantifies blood contamination and is able to detect erythrocytes in 1:750,000 dilution of contaminated VH which affects the results of hypoxanthine. It is an improvement on the previous more complex mass spectrometry method, being faster, more sensitive, and readily available. As such, it could be proposed for the rapid screening of appropriate samples by detecting and eliminating blood contaminated samples from PMI estimation. 相似文献
145.
146.
147.
148.
María del P. Pablo‐Romero Antonio Sánchez‐Braza José Manuel González‐Limón 《政策研究评论》2015,32(5):576-599
The Covenant of Mayors (CM) is the mainstream European movement involving local authorities who voluntarily commit to increase energy efficiency and the use of renewable energy sources within their territories with the aim of reducing CO2 emissions and meet the European Union objectives by 2020. One country that has a greater number of signatories of this agreement is Spain. This article analyzes which factors influence the decision of Spanish local authorities to join the ever‐growing movement. An empirical model is formulated to describe the behavior of Spanish local governments, this being a binary choice model which is a function of various political, economic, and technical factors. Among the prominent factors that influence this decision are population, availability of renewable energy, fiscal and environmental stress, citizens’ political preference, the contagion effect of neighboring municipalities, the existence of covenant coordinators, and finally, economic motivations. 相似文献
149.
This report assesses conditions that contribute to or are potentially hospitable to transnational criminal activity and terrorist
activity in selected regions of the world during the period 1999–2002. Although the focus of the report is on transnational
activity, domestic criminal activity is recognized as a key foundation for transnational crime, especially as the forces of
globalization intensify.
The report has been arranged geographically into the following major headings: Africa, the former Soviet Union and Eastern
Europe, South Asia, Southeast Asia, Western Europe, and the Western Hemisphere. Within the geographical headings, the report
addresses individual countries with particularly salient conditions. Cases such as the Triborder Area (TBA) of South America
and East and West Africa, where conditions largely overlap national borders, have been treated as regions rather than by imposing
an artificial delineation by country. The bibliography has been divided into the same geographical headings as the text.
The major sources for this report are recent periodical reports from Western and regional sources, Internet sites offering
credible recent information, selected recent monographs, and personal communications with regional experts. Treatment of individual
countries varies according to the extent and seriousness of conditions under study. Thus some countries in a region are not
discussed, and others are discussed only from the perspective of one or two pertinent activities or conditions. Because they
border the United States, Canada and Mexico have received especially extensive treatment. 相似文献
150.
Ernesto Garzón Valdés 《Ratio juris》1997,10(2):127-138
The paper contains a conceptual analysis of "act of toleration" and the property of "being tolerant". Being tolerant is understood as a dispositional property of persons manifested in what the author calls the "circumstances of toleration". The main circumstances distinguished are: a tendency to prohibit a certain behaviour and the competence to determine the deontic status of the behaviour in question. An act of toleration, then, consists in not prohibiting (or cancelling the prohibition of) that behaviour. It is argued that this requires the existence of two different normative systems, the "basic system", and the "justifying system". Acts of toleration must be based on reasons coming from the latter. This insight enables one to establish a difference between reasonable and unreasonable toleration, as well as between toleration and related concepts like indifference, acquiescence, etc. The analysis also introduces the distinction between "vertical" and "horizontal" toleration. Acceptance of this last category implies that toleration does not necessarily require hierarchical relationships between those who tolerate and those whose actions are tolerated. 相似文献