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   356篇
  免费   31篇
各国政治   23篇
工人农民   18篇
世界政治   47篇
外交国际关系   16篇
法律   192篇
中国政治   2篇
政治理论   88篇
综合类   1篇
  2023年   9篇
  2021年   11篇
  2020年   14篇
  2019年   12篇
  2018年   14篇
  2017年   14篇
  2016年   24篇
  2015年   18篇
  2014年   18篇
  2013年   62篇
  2012年   20篇
  2011年   24篇
  2010年   15篇
  2009年   11篇
  2008年   14篇
  2007年   12篇
  2006年   15篇
  2005年   9篇
  2004年   16篇
  2003年   17篇
  2002年   9篇
  2001年   3篇
  2000年   4篇
  1999年   3篇
  1998年   4篇
  1997年   2篇
  1996年   2篇
  1995年   4篇
  1993年   1篇
  1992年   2篇
  1991年   1篇
  1988年   1篇
  1970年   1篇
  1965年   1篇
排序方式: 共有387条查询结果,搜索用时 15 毫秒
351.
Departing from the received fact that research joint venture agreements are allowed on the grounds of a permissive ruling, we study what conditions are necessary for venture partners to carry on RD cooperation to the marketing stage. We treat the case of product innovations exploitable with different usages in unconnected markets. Two main results appear: firms always have incentives for a distribution of varieties, but not always agree on the distribution of products. The condition for the last result to happen gives a useful rule for antitrust authorities relating the degree of sustitutability across varieties and the relative profitability of the markets.  相似文献   
352.
This paper analyses the significance and scope of globalisation, focusing on its implications for the autonomy of national actors, on the one hand, and on the new demands that global governance imposes upon multilateral action, on the other. It is argued that the current form of globalisation is in fact compatible with some degree of autonomous coordinated social action outside the realm of the market. This allows us both to differentiate between the realities and mystification (i.e. ideology) that underlie the concept of globalisation and to reject the standard discourse and economic therapy offered by certain international organisations to developing countries. If globalisation does not rule out the possibility of autonomous nationallevel action, it also establishes the basis for more solid and effective multilateral action. The factors that support the need for such action in the future are analysed; action that responds to demands for greater management of international public assets, and to calls for more effective global governance. The article ends by identifying the essential characteristics of such a multilateral system if it is to meet the needs arising from a new international reality.  相似文献   
353.
354.
Now that more and more legal transactions are being performed online, it is increasingly necessary to enable integration of legal mandates within identity and information management systems. The purpose of this article is to outline the legal framework surrounding delegation and to identify basic requirements for any technical application which seeks to provide recognition to legal mandates and delegation processes. Special consideration is also given to the legal implications in situations where a (presumed) mandate holder acts without or outside his authority. Based on these considerations, this article attempts to outline an approach which can significantly reduce the potential risks for both mandate issuers and relying service providers.  相似文献   
355.
In this study, we applied an evolutionary perspective to analyze the relationship between aggressiveness, academic performance, and sociality in a population of 528 adolescents of both sexes. In men, we expect physical aggression (PA) and sociality to be negative predictors of academic performance. However, in women, PA would be a negative predictor of academic performance, and sociality a positive one. Our results report a negative association between academic performance and PA in both sexes. As we expected, social effect derived from the use of PA seems to be different for each sex, where men could display a rebellious attitude to increase chances of finding a mate. In contrast, results for women are not conclusive, because no relationship between academic performance and any aggressive mechanism, were predicted by sociality. We conclude that an evolutionary framework, which includes sex-specific hypotheses, is appropriate to obtain a holistic perspective of this phenomenon.  相似文献   
356.
Private companies want to eliminate outgoing spillovers while policymakers seek to maximize them. With subsidized R&D cooperation agreements both agents partially achieve their objectives. For this reason, in Europe, policymakers grant subsidies for R&D activities with the condition of establishing R&D cooperation agreements. This study explores the relationship of complementarity between R&D subsidy, R&D cooperation and absorptive capacity in the context of its contribution to labor productivity of enterprises. The data used comes from the Technological Innovation Panel (PITEC), managed by the Spanish National Statistics Institute. We selected manufacturing companies in the period 2008–2013. We evaluate the existence of complementarity through the systems approach and the interaction approach. The econometric technique that we used to estimate the coefficients of our empirical model was maximum-likelihood random effects. As a consequence of the low absorptive capacity of Spanish manufacturing firms we find that R&D subsidies and R&D cooperation agreements are not complementary variables, i.e., receiving public subsidies as a result of establishing R&D cooperation agreements has a lower impact on productivity than the sum of the individual impacts of R&D cooperation and R&D subsidies. In consequence, this result calls into question the convenience of using subsidized R&D cooperation agreements as a tool for promoting innovation in EU countries as there are notable differences between the companies in these countries in terms of absorption capacity.  相似文献   
357.
The variation in the epidermal ridge's width between the sexes, during various growth stages, and among different populations has been previously assessed. However, the changes that occur with aging are barely known.The goal of this study was to analyse the degree of variation in epidermal ridge width due to aging. So that, fingerprint ridge density was estimated to establish their relationship with body and hand size changes that typically occur in adulthood.In this study, a sample of 213 adults of both sexes from a Spanish native population of different age ranges—18–30?years old (“junior” group) and 50–66?years old (“senior” group)—was used. Ridge density was assessed in three counting areas of the distal phalanx of each finger (radial, ulnar, and proximal). Height, weight, and a set of anthropometric measurements for both hands were also taken.Our results show that ridge density is higher in females than males throughout adulthood and decreases with aging in the radial and ulnar areas (as the hands widen) but not in the proximal region. Thus, a relationship between hand dimensions and ridge density was found.The data indicate that aging changes may conceal the recognized sex differences in ridge density, and so a better understanding of the topological variations in the epidermal ridge width throughout the life cycle and the factors involved would facilitate the interpretation of the differences between the sexes and different age groups.  相似文献   
358.
Decision transparency is often proposed as a way to maintain or even increase citizen trust, yet this assumption is still untested in the context of regulatory agencies. We test the effect of transparency of a typical decision tradeoff in regulatory enforcement: granting forbearance or imposing a sanction. We employed a representative survey experiment (n = 1,546) in which we test the effect of transparency in general (providing information about a decision or not) and the effect of specific types of transparency (process or rationale transparency). We do this for agencies supervising financial markets, education, and health care. We find that overall decision transparency significantly increases citizen trust in only two of the three agencies. Rationale transparency has a more pronounced positive effect only for the Education Inspectorate. We conclude that the overall effect of decision transparency is positive but that the nature of the regulatory domain may weaken or strengthen this effect.  相似文献   
359.
360.
The authors have reported a macro- and microscopic study of brain lesions in 120 victims of fatal road traffic accidents, independent of the survival time. Diffuse vascular injury (DVI) was found in 14 patients (11.7%). All patients with DVI died within 24 h after the accident. The 14 patients with DVI also showed severe (Grade 2 or 3) diffuse axonal injury (DAI). Since DVI is restricted to road traffic accidents and incompatible with life, the high frequency observed in our series could be explained by the fact that all 120 patients were victims of road traffic accidents, and 69.2% had died within 24 h after the accident. The association between DVI and severe DAI (Grades 2 and 3) suggests that both lesions depend on the same mechanism, with the degree of axonal and vascular damage being determined by the intensity of the head acceleration. Our results show a relationship between DVI and DAI that suggest there may be a spectrum or at least a continuum between these entities as distinct from DVI being a separate entity.  相似文献   
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