全文获取类型
收费全文 | 3872篇 |
免费 | 91篇 |
专业分类
各国政治 | 112篇 |
工人农民 | 113篇 |
世界政治 | 172篇 |
外交国际关系 | 130篇 |
法律 | 2870篇 |
中国政治 | 31篇 |
政治理论 | 494篇 |
综合类 | 41篇 |
出版年
2021年 | 19篇 |
2020年 | 43篇 |
2019年 | 63篇 |
2018年 | 82篇 |
2017年 | 71篇 |
2016年 | 88篇 |
2015年 | 51篇 |
2014年 | 79篇 |
2013年 | 303篇 |
2012年 | 119篇 |
2011年 | 154篇 |
2010年 | 95篇 |
2009年 | 86篇 |
2008年 | 126篇 |
2007年 | 141篇 |
2006年 | 128篇 |
2005年 | 93篇 |
2004年 | 136篇 |
2003年 | 122篇 |
2002年 | 120篇 |
2001年 | 156篇 |
2000年 | 137篇 |
1999年 | 108篇 |
1998年 | 22篇 |
1995年 | 19篇 |
1993年 | 28篇 |
1992年 | 64篇 |
1991年 | 84篇 |
1990年 | 88篇 |
1989年 | 91篇 |
1988年 | 96篇 |
1987年 | 89篇 |
1986年 | 75篇 |
1985年 | 78篇 |
1984年 | 67篇 |
1983年 | 58篇 |
1982年 | 24篇 |
1981年 | 20篇 |
1979年 | 30篇 |
1978年 | 33篇 |
1977年 | 22篇 |
1976年 | 27篇 |
1975年 | 28篇 |
1974年 | 37篇 |
1973年 | 37篇 |
1972年 | 35篇 |
1971年 | 36篇 |
1970年 | 38篇 |
1969年 | 32篇 |
1968年 | 27篇 |
排序方式: 共有3963条查询结果,搜索用时 15 毫秒
991.
Tahir MA Herrera RJ Khan AA Kashyap VK Duncan G Barna C Budowle B Rowold DJ Amjad M Sinha S 《Journal of forensic sciences》2000,45(6):1320-1323
Blood samples were collected from 115 individuals residing in the Pakistani state of West Punjab and 81 Bengali individuals residing in the state of East Bengal, India. These samples were analyzed for the loci HLA-DQA1, PM (LDLR, GYPA, HBGG, D7S8, and GC) and eight short tandem repeats: CSF1PO, TPOX, THO1, vWA, D16S539, D7S820, D13S317, and D5S818. Departures from Hardy-Weinberg (HWE) were observed in Punjabi population at LDLR, THO1, D13S317, D5S818, and D16S539 and at CSF1PO and THO1 in Bengali population. 相似文献
992.
Solokhin EV Belova TS Naumov MR Strokova VA Mikhaĭlova GV Popov SV Vasilevskiĭ VK 《Sudebno-meditsinskaia ekspertiza》2000,43(3):17-19
Morphological characteristics of changes in the spine and lungs in patients with spinal injuries dead in hospital are described. Spinal edemas were detected in all cases. Edemas were found even in subjects dead at the place where the injury was inflicted. Morphological changes in the lungs were characterized by a phase-wise process, depended on the volume of injury, duration of hospitalization, medical care rendered, and manifested by disorders of blood content of the organ, development of tissue edema, and pneumonia. These data do not rule out the development of pneumonia in patients with spinal injuries. 相似文献
993.
Liquor samples from 159 live subjects with craniocerebral injuries were analyzed. Forty-four patients had brain concussions, 30 light contusions of the brain, 43 medium-severe contusions of the brain, and 42 severe contusions of the brain. Crystallograms were evaluated by 37 signs detected visually and by stereoscopy. The main diagnostic criteria for evaluation of the severity of craniocerebral injury were defined. 相似文献
994.
Pavlov IuV 《Sudebno-meditsinskaia ekspertiza》2000,43(6):18-21
The morphology of hairs from the head, beard, chest, armpits, and pubis was studied in indigenous population of Sudan, Sierra-Leone, Cote d'Ivoir, Ruanda, Nigeria, Gambia, Kenya, Uganda, Burundi, Zaire, Southern African Republic, Angola, Benin, and Guinea Bissau. A total of 327 hair specimens were examined. A number of new parameters of hairs were determined: thickness, number of cuticle pattern lines per mm, optic edge pattern, cuticle patterns, methods for detecting the cortical and medullar layers, width of hair layers and their transverse sections. The resultant morphological signs are new specific signs for African residents (Negroid) which can be used in forensic medical studies for identifying the race appurtenance of hairs. 相似文献
995.
Sudden death in female pseudohermaphroditism is described. Hemorrhage into hyperplastic adrenals leads to acute adrenal failure and is the immediate cause of death. 相似文献
996.
Main and middle phalanx skin patterns represent a polymorphic hereditary system of signs practically not studied in anthropology, but interesting for forensic medicine and criminology from the viewpoint of expert evaluation of relation and personality identification. Based on a vast scope of data (600 hand impressions of 300 subjects from Russian families), a classification of patterns on the main and middle finger phalanges has been developed and their incidence evaluated. The proposed classification includes 15 types and 40 subtypes. The incidence of individual patterns on phalanges of different site and order has been determined. The problem of genetic determination, i.e. inheritance of certain patterns from father and mother, remains open and requires a special research. 相似文献
997.
Computer-aided personality identification by skull and life-time photography by POSKID 1.1 method 总被引:1,自引:0,他引:1
An improved method for computer-aided personality identification by the skull, based on the POSKID 1.1 software, consists in investigation of enlarged images of the skull and life-time photograph of the probable individual by coordinates of 49 anatomical points; independent quantitative evaluation of the aspect of each of the compared objects by the X, Y, and Z axes; formal evaluation of the results of comparative study of the skull-portrait by multidimensional discriminant analysis models. The proposed version differs from the POSKID 1.0 software in the method for evaluating the spatial position of the head on the portrait and adequate orientation of the skull in space, which necessitates the utilization of coordinate-regulated holder POSKID 1.1 method is based on multidimensional discriminant analysis and suggests a virtually reliable solution in 76.13-80.65% cases, a probable solution (positive and negative) in 11.61-18.06% cases, and motivated refusal from solution in 5.81-7.74% cases. In case of a probable or indefinite solution further investigations are recommended making use of life-time photographs with different aspects. 相似文献
998.
The use of teeth as an important resource in the analysis of forensic case history by polymerase chain reaction (PCR) or other related methods has been reported. However, a major drawback in using teeth has been that the DNA is present only in trace amounts, and the methods to recover DNA from the flinty material have not been efficient or cost effective. In this report, we describe a method to prepare DNA from the hard tooth tissues. Our studies show that ultrasonication of teeth samples yields sufficient amounts of good quality DNA useful for PCR-based diagnostic methods. The teeth could serve as a reliable source of DNA for amplification-based forensic methods in sex determination. DNA could be obtained from any tooth, regardless of the age of subject. Furthermore, by using the AMEL gene-based primers in PCR, we have shown that the AMEL gene serves as a good marker for sex determination in the Indian population. In our study, the PCR-based method was sensitive and proved to be successful for sex determination with a complete specificity. 相似文献
999.
1000.
Almog J Sears VG Springer E Hewlett DF Walker S Wiesner S Lidor R Bahar E 《Journal of forensic sciences》2000,45(3):538-544
Benzo[f]ninhydrin was compared to ninhydrin for fingerprint development on paper. Overall, the performance of ninhydrin on exhibits was slightly better than that of benzo[f]ninhydrin. The significant advantages of the benzo[f]ninhydrin over ninhydrin were the much stronger fluorescence it gave after treatment with zinc salts and a slightly quicker reaction under ambient conditions. This fluorescence is, however, similar to that obtained with other reagents, such as DFO or ninhydrin analogs. These advantages apparently are not sufficient to justify regular usage of benzo[f]ninhydrin, especially when one considers its low solubility and high cost. 相似文献