全文获取类型
收费全文 | 2607篇 |
免费 | 42篇 |
专业分类
各国政治 | 126篇 |
工人农民 | 62篇 |
世界政治 | 152篇 |
外交国际关系 | 66篇 |
法律 | 1918篇 |
中国政治 | 21篇 |
政治理论 | 287篇 |
综合类 | 17篇 |
出版年
2020年 | 30篇 |
2019年 | 22篇 |
2018年 | 24篇 |
2017年 | 33篇 |
2016年 | 40篇 |
2015年 | 23篇 |
2014年 | 38篇 |
2013年 | 187篇 |
2012年 | 60篇 |
2011年 | 68篇 |
2010年 | 36篇 |
2009年 | 35篇 |
2008年 | 56篇 |
2007年 | 71篇 |
2006年 | 71篇 |
2005年 | 74篇 |
2004年 | 72篇 |
2003年 | 70篇 |
2002年 | 70篇 |
2001年 | 156篇 |
2000年 | 123篇 |
1999年 | 76篇 |
1998年 | 26篇 |
1995年 | 18篇 |
1994年 | 22篇 |
1993年 | 21篇 |
1992年 | 63篇 |
1991年 | 69篇 |
1990年 | 61篇 |
1989年 | 84篇 |
1988年 | 83篇 |
1987年 | 72篇 |
1986年 | 76篇 |
1985年 | 65篇 |
1984年 | 35篇 |
1983年 | 41篇 |
1982年 | 19篇 |
1981年 | 30篇 |
1979年 | 28篇 |
1978年 | 21篇 |
1977年 | 27篇 |
1976年 | 19篇 |
1975年 | 31篇 |
1974年 | 30篇 |
1973年 | 31篇 |
1972年 | 32篇 |
1971年 | 24篇 |
1970年 | 20篇 |
1969年 | 24篇 |
1968年 | 20篇 |
排序方式: 共有2649条查询结果,搜索用时 8 毫秒
981.
Asbestos, a fibrous mineral, has unique physical and chemical properties, including resistance to heat, acids, and other chemicals; flexibility; and great tensile strength. The fibers subdivide into unit fibrils of molecular dimensions, resulting in a vast mineral surface area which has a direct bearing on its unusual features and its numerous applications. Its biological effects, which include fibrogenesis and carcinogenesis, may be related to the cellular reaction, to its large specific surface, or to the size and shape of the fibers. Its oncogenic action may be multiplied by other carcinogens, principally cigarette smoking. There is clinical, pathologic, and epidemiologic evidence that exposure to asbestos, following a long latent period, constitutes an important health hazard. Direct occupational exposure, followed by a long lapsed period after the initial exposure, is associated with pleural plaques and pleural effusion, pulmonary parenchymal fibrosis (asbestosis), pulmonary carcinoma, pleural and peritoneal mesothelioma, and other neoplasms. Indirect exposure may also entail an increased risk of lung disease or mesothelioma or both. Medicolegal investigation of suspected cases includes a lifetime occupational history, clinical history including smoking habits, radiological findings, clinical evidence of asbestosis, and may require detection of asbestos tissue burden. 相似文献
982.
983.
984.
Misidentification syndromes or phenomena are found in a number of psychiatric situations that may become the subject of forensic science review. One of the most curious is misidentification of self in which the individual perceives himself or herself as another being while able to explain the loss of the original identity. Recognizing these phenomena may be helpful in accurate diagnosis, in considering such conditions as psychosis of whatever type, multiple personality disorder, and other amnesia and fugue states, and in understanding the person's psychopathology. Two cases are presented to illustrate a process that the authors have named the Riel Phenomenon, after the person who was a party to what is often recognized as the most famous case in Canadian history. 相似文献
985.
H.K. Thomsen L. Danielsen O. Nielsen O. Aalund K.G. Nielsen T. Karlsmark I.K. Genefke 《Forensic science international》1981,17(2):133-143
In order to find methods applicable for disclosing electrical torture, pig skin was exposed to heat and electricity under controlled circumstances. Biopsies were obtained immediately after exposure and the morphology of the heat lesions was compared to that of electrical lesions. The cytoplasm of epidermal cells in heat lesions appeared granular or fibrillar, while the nuclei were rather unaffected. In electrical lesions the cytoplasm appeared homogeneous often with a peculiar white colour in hematoxylin-eosin stained sections. The nuclei were either dark and shadowy or enlarged and vesicular. The keratin in electrical lesions often showed a bright yellow colour. Small defects in the epidermis were seen in some electrical lesions. Thus the morphology of electrical lesions differed markedly from that of heat lesions. Although some of these differences may be due to differences in distribution and intensity of energy, it is probable that pH shifts in the cells due to electrolysis is the main cause of the specific morphology of electrical lesions. 相似文献
986.
Using a semistructured measure to minimize cross-cultural biases, we examined the relationship between negative self and family-other affect and delinquency among 135 Mexican families of varying social class. The results indicated that: (a) both processed and released delinquent youths and their parents evaluated themselves more negatively than nondelinquent youths and their parents; (b) appraisals in the families of processed and released delinquents did not differ appreciably; (c) migrant families tended to manifest the most negativity and lower-class families the least, with middle-class families in between; and (d) socioeconomic status did not predict the relationship between family hostility and delinquency. The results are seen as providing more support for the family control theory of delinquency than for processing-labeling theory. 相似文献
987.
988.
This article investigates three hypotheses suggested in the literature on women’s political empowerment, operationalized here
as increased legislative representation. These hypotheses are that (1) electoral systems manipulate women’s political empowernment;
(2) increased popular participation empowers women in particular; and (3) accumulated experience gained over several electoral
cycles facilitates increased political empowerment of women. In Africa, as well as in other parts of the world, majoritarian
systems discriminate against women, while the effect of large parties in proportional representation systems is more ambiguous,
and popular participation and repetitive electoral cycles are increasing women’s legislative representation. This article
demonstrates the value of studying gender relations under democratization, even with a narrow institutionalist focus using
an elitist perspective. Finally, it shows that institutions can travel over diverse contexts with constant effects.
Staffan I. Lindberg is a Ph.D. candidate at Lund University. He has published on state building, democratization, and clientilism.
From 1999 to 2001, he worked as an international consultant to Parliament in Ghana. His dissertation is on elections and the
stabilization of polyarchy in sub-Saharan Africa.
I would like to acknowledge the helpful comments from Goran Hyden, Andreas Schedler, Wynie Pankani, two anonymous reviewers,
and the editors of the journal. The content, of course, is the author’s sole responsibility. This research has been made possible
by Sida Grant No. SWE-1999-231. 相似文献
989.
Report on suicide with chloroquine in combination with maprotiline and trimipramine. Chloroquine and his metabolite monodesethylchloroquine could be determined in organs and body fluids. The highest organ-concentrations of chloroquine were found in liver and kidney. The survival time and dose are discussed. 相似文献
990.
Since carbon monoxide (CO) production after death was suggested in a drowned body, CO and carboxyhemoglobin (HbCO) levels in blood and body cavity fluids of cadavers which were not exposed to fire and CO have been analyzed. CO released from the tissues was determined by gas chromatography and gas chromatography-mass spectrometry, and the total concentration of hemoglobin (Hb) was measured as cyanmethemoglobin (CNmHb). The HbCO level was calculated by the ratio of CO content and CO-binding capacity. CO levels (ml/100 g at STP) of the seven cases in which blood and body cavity fluids could be collected ranged from 0.13 to 0.87 in blood and 0.02 to 0.80 in body cavity fluids. HbCO levels in blood and body cavity fluids were from 0.3 to 6.0% and from 2.3 to 44.1%, respectively. In a typical case showing postmortem formation of CO, the CO levels in body cavity fluids were higher than that in blood. It is suggested that CO in a putrefied body is due to CO in blood prior to death and the CO formed by the decomposition of Hb, myoglobin and other substances during putrefaction. The significance of HbCO levels in body cavity fluids of cases with marked postmortem decomposition seems difficult to interpret without the value of HbCO in blood. 相似文献