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   3179篇
  免费   19篇
  国内免费   4篇
教育   2200篇
科学研究   566篇
各国文化   4篇
体育   104篇
综合类   16篇
文化理论   64篇
信息传播   248篇
  2023年   3篇
  2022年   9篇
  2021年   23篇
  2020年   6篇
  2019年   10篇
  2018年   69篇
  2017年   112篇
  2016年   181篇
  2015年   126篇
  2014年   72篇
  2013年   91篇
  2012年   163篇
  2011年   176篇
  2010年   87篇
  2009年   36篇
  2008年   72篇
  2007年   64篇
  2006年   49篇
  2005年   692篇
  2004年   483篇
  2003年   322篇
  2002年   160篇
  2001年   75篇
  2000年   44篇
  1999年   28篇
  1998年   5篇
  1997年   4篇
  1996年   5篇
  1995年   4篇
  1994年   1篇
  1993年   4篇
  1992年   2篇
  1991年   2篇
  1990年   2篇
  1989年   3篇
  1988年   1篇
  1987年   5篇
  1986年   1篇
  1984年   1篇
  1979年   1篇
  1978年   1篇
  1976年   2篇
  1975年   1篇
  1974年   1篇
  1973年   1篇
  1967年   1篇
  1958年   1篇
排序方式: 共有3202条查询结果,搜索用时 15 毫秒
981.
This paper argues that the traditional employment relationship based on long-term commitment and reciprocity has been replaced by one which incorporates a high level of precariousness and that individuals form perceptions of the trust they have in the organisation based on their view of the psychological contract. This paper develops a model of these perceptions and develops six propositions about an individual's level of trust in the organisation, management and fellow workers and their belief that their expectations will be progressively met and that they will be compensated in the long term for their contribution. These perceptions and the six propositions developed in the paper have profound ramifications for the willingness of individuals to converse and potentially to share their knowledge with others for the benefit of the organisation, because high levels of trust will be needed before individuals will be predisposed to start to converse and exhibit a willingness to share their knowledge.  相似文献   
982.
This paper reports the findings from a survey conducted in Australia to explore current practices relating to knowledge management (KM) and intellectual capital (IC). A systematic approach in the form of the intellectual capital web guided the research. Findings revealed that KM was perceived to be more about developing knowledge culture than about managing organisational processes and structure. IC was perceived to be more about human capital than about customer capital and organisational capital. It can therefore be concluded that human capital holds the greatest importance for KM and IC. However, when facilitators for knowledge creation and knowledge sharing were rated, organisation structure was perceived to be more important than organisational culture and information technology. For KM practices, participants indicated that more attention was paid to training and developing employees and less to measurement and reward and incentive issues. The importance of aligning the management of IC and KM was perceived to be more important than the difficulty of doing so.  相似文献   
983.
Based on an exploratory study of the work and learning processes of highly skilled and experienced knowledge workers, this paper explores an alternative perspective to knowledge management, one that focuses on how individual workers apply knowledge processes to support their day-to-day work activities – broadly characterized as problem solving – and learning practices. Developing the concept of Personal Knowledge Management, the paper presents an emergent model that links distinctive types of problem solving activities with specific cognitive, information, social and learning competencies, supported by an individual, social and organizational enablers.  相似文献   
984.
Looking to the Internet for models of governance   总被引:3,自引:0,他引:3  
If code is law then standards bodies are governments. This flawed but powerful metaphor suggests the need to examine more closely those standards bodies that are defining standards for the Internet. In this paper we examine the International Telecommunications Union, the Institute for Electrical and Electronics Engineers Standards Association, the Internet Engineering Task Force, and the World Wide Web Consortium. We compare the organizations on the basis of participation, transparency, authority, openness, security and interoperability. We conclude that the IETF and the W3C are becoming increasingly similar. We also conclude that the classical distinction between standards and implementations is decreasingly useful as standards are embodies in code – itself a form of speech or documentation. Recent Internet standards bodies have flourished in part by discarding or modifying the implementation/standards distinction. We illustrate that no single model is superior on all dimensions. The IETF is not effectively scaling, struggling with its explosive growth with the creation of thousands of working groups. The IETF coordinating body, the Internet Society, addressed growth by reorganization that removed democratic oversight. The W3C, initially the most closed, is becoming responsive to criticism and now includes open code participants. The IEEE SA and ITU have institutional controls appropriate for hardware but too constraining for code. Each organization has much to learn from the others.  相似文献   
985.
Glutathione and ascorbic acid in erythrocytes are suggested to be essential in the detoxification of superoxide radicals and hydrogen peroxide formed during red cell metabolism. In sickle cell patients who are more prone to haemolysis have greater propensity for the formation of superoxide radical and hydrogen peroxide. In the present study conducted on sickle cell patients provide evidence for the presence of reduced levels of both ascorbic acid and glutathione in the red cells. This may seem to suggest that vitamin C supplementation may help such patients who are prone to haemolysis.  相似文献   
986.
This paper proposes a typology of communities of practice based on their knowledge characteristics. The structure of a community of practice, in terms of knowledge, may tend to the stratified or to the egalitarian. The predominant knowledge activity of the community may be sharing or nurturing. This produces four classes of community of practice. The paper identifies and discusses examples of these classes. It is argued that the class to which a community belongs tends to determine the rapidity with which knowledge within the community evolves and the degree of pluralism, as opposed to homogeneity, that the knowledge exhibits. The paper concludes by discussing some of the implications of the typology for knowledge management practice.  相似文献   
987.
Purpose – This paper aims to explore the role of internal and external knowledge-based linkages across the supply chain in achieving better operational performance. It investigates how knowledge is accumulated, shared, and applied to create organization-specific knowledge resources that increase and sustain the organization’s competitive advantage. Design/methodology/approach – This paper uses a single case study with multiple, embedded units of analysis, and the social network analysis (SNA) to demonstrate the impact of internal and external knowledge-based linkages across multiple tiers in the supply chain on the organizational operational performance. The focal company of the case study is an Italian manufacturer supplying rubber components to European automotive enterprises. Findings – With the aid of the SNA, the internal knowledge-based linkages can be mapped and visualized. We found that the most central nodes having the most connections with other nodes in the linkages are the most crucial members in terms of knowledge exploration and exploitation within the organization. We also revealed that the effective management of external knowledge-based linkages, such as buyer company, competitors, university, suppliers, and subcontractors, can help improve the operational performance. Research limitations/implications – First, our hypothesis was tested on a single case. The analysis of multiple case studies using SNA would provide a deeper understanding of the relationship between the knowledge-based linkages at all levels of the supply chain and the integration of knowledge. Second, the static nature of knowledge flows was studied in this research. Future research could also consider ongoing monitoring of dynamic linkages and the dynamic characteristic of knowledge flows. Originality/value – To the best of our knowledge, the phrase ‘knowledge-based linkages’ has not been used in the literature and there is lack of investigation on the relationship between the management of internal and external knowledge-based linkages and the operational performance. To bridge the knowledge gap, this paper will show the importance of understanding the composition and characteristics of knowledge-based linkages and their knowledge nodes. In addition, this paper will show that effective management of knowledge-based linkages leads to the creation of new knowledge and improves organizations’ operational performance.  相似文献   
988.
This paper deals with the problem of finding graphs (directed and undirected) maximizing the number of spanning trees among the regular graphs with the same number of nodes and edges. The approach is based on heuristic algorithms such as k-optimal and evolutionary. The emphasis is rather on checking whether these techniques are applicable to solving extremal graph problems than investigating generic structures of optimal graphs. For this reason circulant graphs, for which computationally effective tree counting formulas exist, are discussed first and then the results extended to cover the class of regular graphs.  相似文献   
989.
野外地质调查发现在阿尔泰南缘额尔齐斯构造带东段、额尔齐斯活动断裂与富蕴-锡泊渡断裂之间发育了一套未变形的酸性岩墙群.岩墙群侵位于海西期片麻岩化花岗岩和上石炭统深变质的额尔齐斯组岩层中,薄片鉴定和岩石地球化学分析确定为具有细晶结构的流纹斑岩.岩石的SiO2含量为70.9%~75.38%,K2O+Na2O含量为7.55%~8.99%;大部分样品Na2O>K2O,里特曼指数值为1.8~2.5之间,Al2O3=12.80%~14.53%,A/CNK=0.9~1.1,NK/A=0.7~0.9,具有准铝质-弱过铝质、低镁、高钾钠、低钙和锶、高(Fe)mol/(Mg)mol特点,具A型花岗岩类特点,属于亚碱性脉岩.岩石轻稀土富集,大离子亲石元素相对富集,具有明显的中等负铕异常,壳源特征明显.锆石U-Pb二次粒子微探针测年显示岩墙群形成于277~286Ma.推断岩墙是阿尔泰海西期造山运动结束后,在拉张构造环境下的地壳局部熔融产物.  相似文献   
990.
It has been argued that moral problems in relation to Information Technology (IT) require new theories of ethics. In recent years, an interesting new theory to address such concerns has been proposed, namely the theory of Information Ethics (IE). Despite the promise of IE, the theory has not enjoyed public discussion. The aim of this paper is to initiate such discussion by critically evaluating the theory of IE.  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