首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   124篇
  免费   6篇
各国政治   5篇
工人农民   3篇
世界政治   3篇
外交国际关系   3篇
法律   75篇
政治理论   40篇
综合类   1篇
  2022年   2篇
  2021年   3篇
  2019年   3篇
  2018年   2篇
  2016年   3篇
  2015年   4篇
  2013年   14篇
  2012年   2篇
  2011年   5篇
  2010年   4篇
  2009年   5篇
  2008年   5篇
  2007年   7篇
  2006年   4篇
  2005年   4篇
  2004年   11篇
  2003年   8篇
  2002年   11篇
  2001年   1篇
  2000年   5篇
  1999年   2篇
  1998年   1篇
  1997年   4篇
  1996年   1篇
  1995年   2篇
  1994年   1篇
  1992年   1篇
  1991年   3篇
  1988年   1篇
  1987年   2篇
  1986年   1篇
  1983年   1篇
  1982年   3篇
  1978年   1篇
  1976年   1篇
  1971年   1篇
  1968年   1篇
排序方式: 共有130条查询结果,搜索用时 15 毫秒
71.
The paper investigates the roles of government, science and industry in meeting the R & D requirements of our society. It considers the present state of the art of the cooperation involved, emphasizes the need for integrated planning, programming, and budgeting in research, development and technology, and comments on the European technology crisis.This paper presented in part at the First International R & D Management Conference Vienna, October 1970. The paper represents the personal views of the author. Full address: Adenauer-Allee 120, 5300 Bonn, Germany.  相似文献   
72.
A 54-year-old butcher attempted to commit suicide with a manipulated "humane killer". He removed the recoil spring, the rubber bush and also the screw forming the muzzle end, which to our knowledge has never been described in a case report before. Due to this manipulation the entire bolt left the weapon, as a free projectile, penetrated the forehead and lodged inside the skull, from where it could not be removed neurosurgically. The patient died from the consequences of the severe cerebral injury 3 days later.  相似文献   
73.
74.
The present study examines how formation of social capital in themicrofinance sector is affected by enlarging the political or economicresources of the informal groups of poor households and microfinanceinstitutions (MFIs) that contribute to social cohesion. In particular, thischapter attempts to show how the regulatory and supervisory framework as wellas the financial innovations of microfinance institutions have affected poorhouseholds capacity for cooperation and mutual support in their fightagainst poverty.  相似文献   
75.
Mitochondrial DNA sequences of the hypervariable regions HV I and HV II were analyzed in 300 unrelated individuals born and living in the northeast corner of Germany (Western Pomerania) to generate a database for forensic identification purposes in this region. Sequence polymorphism were detected using PCR and direct sequencing analysis. A total of 242 different haplotypes were found as determined by 147 variable positions. The most frequent haplotype (263G, 315.1C) was found in 10 individuals and is also the most common sequence in Europe. Three other haplotypes were shared by 5 individuals, 2 sequences by 4, 8 haplotypes by 3, 15 sequences by 2 persons, and 213 sequences were unique. The genetic diversity was estimated to be 0.99 and the probability of two random individuals showing identical mitochondrial DNA (mtDNA) haplotypes is 0.6%. A comparison with other studies from Germany showed only little differences in the distribution of haplogroups. Nevertheless, one frequent haplotype in northeast Germany (five unrelated individuals) could only rarely be found in other German and European regions. Our results may indicate that despite a high admixture proportion in the German population some regions could demonstrate certain characteristic features.  相似文献   
76.
Zusammenfassung Von adulten M?nnchen der beiden SchabenartenPeriplaneta americana undBlaberus trapezoideus wurden gleichzeitig Vorzugstemperatur und Vorzugsluftfeuchtigkeit ermittelt. Für beide Arten konnten in ihren Vorzugstemperaturen gewisse Akklimatisationserscheinungen festgestellt werden. BeiP. americana steigt die Vorzugstemperatur von 26°–29° nach einem einmonatigen Aufenthalt bei 20° auf etwa 29°–30° nach einerer Exposition bei 35° an.B. trapezoideus hat eine um etwa 3° niedrigere Vorzugstemperatur. Nach einem Aufenthalt bei 20° betr?gt sie etwa 23°–26°. Sie steigt auf etwa 26° nach einer Exposition bei 32° an.P. americana bevorzugt stets ein trockenes Milieu (geboten wurden 18% r.L.),B. trapezoideus such h?here Luftfeuchtigkeit auf (45%–93% r.L.) und meidet trockenes Milieu. Ein Gewichtsverlust von 15%–18% veranla?tP. americana eine um 1°–3° niedrigere Vorzugstemperatur, aber vor allem eine sehr hohe Luftfeuchte aufzusuchen. Ein Gewichtsverlust von 20%–25% des K?rpergewichtes hat keinen Einflu? auf die Vorzugstemperatur vonB. trapezoideus; jedoch halten sich die Tiere nur ebenfalls l?nger in sehr hoher Luftfeuchte auf.
Summary The combined temperature and humidity preferences were investigated in adult males ofPeriplaneta americana andBlaberus trapezoideus. Both species show an acclimatization effect. After spending one acclimatization at 20°B. trapezoideus preferred 23°–26°, after spending one month at 32° the preference was about 26°.P. americana prefers the lowest available humidity (18%).B. trapezoideus avoids dry air and is equally distributed in the steps provided of 45%–93% r.h. After desiccation to 15%–18% of the total body weight,P. americana prefers a temperature 1°–3° lower than that before desiccation, but in this case most of all it prefers a very high humidity. Desiccation has no influence on the temperature preference ofB. trapezoideus, but the animal spends more time in very high humidities.
  相似文献   
77.
The identification of body fluids can be of crucial importance in forensic casework. Recently we have shown that the detection of cell- and tissue-specific mRNAs is a suitable technique to identify menstrual blood and semen. In this paper we present an improved method using real time-PCR and the menstrual blood marker MMP-7 which increases sensitivity and specificity. We furthermore demonstrate case examples described showing that the correct identification of samples as non-menstrual is likely to be in the focus of criminal investigations. Although negative test results may have a number of other reasons, the new technique provides quantitative results thus allowing a cut-off value for the control marker GAPDH to be defined, below which negative results for the menstrual blood marker MMP-7 allow the conclusion that the sample was indeed not menstrual blood. Using these data, it is possible to apply the molecular identification of menstrual blood to forensic casework considering both the limitations and the capabilities of the method.  相似文献   
78.
Abstract. This paper explores the emergence of direct linkages between the international economy and the state government of Baden–Württemberg, Germany. In the early 1990s Baden–Württemberg embarked on a plan in which the laender government took the lead in organizing a large–scale, high technology project for the development of interactive television. Creating a 'network' between itself and major economic actors the laender government sought to enhance the economic development of the region. However, as the economic actors involved in the project questioned the economic viability of interactive television, they began to withdraw from the project. The project's failure demonstrates the incompatibility of political objectives with the economic goals of actors in a globalized economy. We conclude that as attractive as the network approach may be for regional and national governments, it is likely to be successful only where both sets of actors see the outcome as enhancing their respective priorities (political legitimacy and economic gains).  相似文献   
79.
80.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号