全文获取类型
收费全文 | 725篇 |
免费 | 12篇 |
国内免费 | 8篇 |
学科分类
社会科学 | 745篇 |
出版年
2023年 | 10篇 |
2022年 | 41篇 |
2021年 | 15篇 |
2020年 | 15篇 |
2019年 | 11篇 |
2018年 | 13篇 |
2017年 | 21篇 |
2016年 | 26篇 |
2015年 | 59篇 |
2014年 | 37篇 |
2013年 | 79篇 |
2012年 | 68篇 |
2011年 | 60篇 |
2010年 | 46篇 |
2009年 | 37篇 |
2008年 | 31篇 |
2007年 | 23篇 |
2006年 | 31篇 |
2005年 | 38篇 |
2004年 | 8篇 |
2003年 | 8篇 |
2002年 | 5篇 |
2001年 | 7篇 |
2000年 | 8篇 |
1999年 | 13篇 |
1998年 | 6篇 |
1997年 | 6篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有745条查询结果,搜索用时 15 毫秒
1.
Cross-border R&D can contribute to the enhancement of independent innovation capabilities of emerging markets multinational enterprises (EMNEs) by benefiting from knowledge management. However, scant research exists examining the location impact of cross-border R&D for EMNEs on performance implications. This paper fills this important theoretical gap by building upon the literature of genetic distance in connection with knowledge management. We use a panel data of Chinese high-tech listed companies to empirically examine the impact of genetic distance on the performance of cross-border R&D and the role played by international experience. Our results reveal a positive relationship between genetic distance and the performance of cross-border R&D. Importantly, we highlight the motivation for cross-border R&D of EMNEs to acquire technical knowledge magnifies the positive effects of genetic distance and performance. Furthermore, our analysis indicates that international experience significantly enhanced the positive effect of genetic distance on cross-border R&D performance. We conclude this paper by discussing theoretical contributions to genetic distance, international management and knowledge management, as well as practical implications for cross-border R&D of EMNEs. 相似文献
2.
3.
Because of its application in the field of security in wireless sensor networks, k-path vertex cover (\(\hbox {VCP}_k\)) has received a lot of attention in recent years. Given a graph \(G=(V,E)\), a vertex set \(C\subseteq V\) is a k-path vertex cover (\(\hbox {VCP}_k\)) of G if every path on k vertices has at least one vertex in C, and C is a connected k-path vertex cover of G (\(\hbox {CVCP}_k\)) if furthermore the subgraph of G induced by C is connected. A homogeneous wireless sensor network can be modeled as a unit disk graph. This paper presents a new PTAS for \(\hbox {MinCVCP}_k\) on unit disk graphs. Compared with previous PTAS given by Liu et al., our method not only simplifies the algorithm and reduces the time-complexity, but also simplifies the analysis by a large amount. 相似文献
4.
Assessing Major Accident Risks to Support Land‐Use Planning Using a Severity‐Vulnerability Combination Method: A Case Study in Dagushan Peninsula,China 下载免费PDF全文
Shuming Ma Shushen Zhang Chen Yu Hongbo Zheng Guobao Song Henry Musoke Semakula Yingying Chai 《Risk analysis》2015,35(8):1503-1519
Major accident risks posed by chemical hazards have raised major social concerns in today's China. Land‐use planning has been adopted by many countries as one of the essential elements for accident prevention. This article aims at proposing a method to assess major accident risks to support land‐use planning in the vicinity of chemical installations. This method is based on the definition of risk by the Accidental Risk Assessment Methodology for IndustrieS (ARAMIS) project and it is an expansion application of severity and vulnerability assessment tools. The severity and vulnerability indexes from the ARAMIS methodology are employed to assess both the severity and vulnerability levels, respectively. A risk matrix is devised to support risk ranking and compatibility checking. The method consists of four main steps and is presented in geographical information‐system‐based maps. As an illustration, the proposed method is applied in Dagushan Peninsula, China. The case study indicated that the method could not only aid risk regulations on existing land‐use planning, but also support future land‐use planning by offering alternatives or influencing the plans at the development stage, and thus further enhance the roles and influence of land‐use planning in the accident prevention activities in China. 相似文献
5.
会计稳健性要求及时确认损失的发生、延时确认收益的发生.一般认为会计稳健性较高的公司,信息不对称程度低,具有较高的公司治理水平.本文从公司投资行为视角考察会计稳健性对自由现金流代理成本的影响.通过研究发现:非效率投资在我国企业普遍存在;高的会计稳健性具有抑制非效率投资的作用,并在一定程度上降低了自由现金流的代理成本.但要彻底解决非效率投资问题,仍需进一步规范公司的现金持有政策,并完善公司治理结构.本文的研究也为控制自由现金流的代理成本提供了一种可行性的解决方案. 相似文献
6.
Zhongsheng Hua Wuhua Chen Zhe George Zhang 《Production and Operations Management》2016,25(8):1430-1448
As a result of government budgetary limits and rapid market growth, many public service systems—such as health care—are characterized by extensive customer wait times that have become a serious problem. This problem might be solved by allowing private firms to enter these markets, which would provide customers with a choice between a free (governmental) public service provider (SP) and a fee‐charging (or “toll”) private SP. In such a two‐tier service system, the two SPs are differentiated by service quality and cost efficiency. This study focuses on the competition and coordination issues for two‐tier service systems with customers who are sensitive to both service quality and delay. The free system attempts to maximize its expected total customer utility with limited capacity, whereas the toll system attempts to maximize its profit. Neither goal is aligned with the social welfare goal of the public service. To achieve the social welfare goal, the government plays a crucial role in coordinating the two‐tier service system via the budget, the tradeoff of social members' goals, and tax‐subsidy policies. Using a mixed duopoly game, we establish Nash equilibrium strategies and identify the conditions for the existence of the two‐tier service system. We employ several interesting and counter‐intuitive managerial insights generated by the model to show that the public service can be delivered more efficiently via customer choice and SP competition. In addition, we show that a relatively low tax‐subsidy rate can almost perfectly coordinate the two SPs to achieve most of the maximum possible benefit of the two‐tier service system. 相似文献
7.
This study examines a firm's quality and price decisions when consumers differ not only in their willingness‐to‐pay for quality but also in their reservation utility for the basic product. We find that while the firm offers lower‐quality products when consumers' valuations for quality deteriorate, the optimal quality may increase with a negative shift in consumers' reservation utilities. We also investigate the optimal price and quality of the products within a vertically differentiated product line when the number of products is exogenously given. The existing literature shows that when consumers differ only in their willingness‐to‐pay for quality, the firm sets the efficient quality for consumers with the highest valuation for quality, whereas the concern for cannibalization pushes down the quality of inferior products. We find that when consumers are heterogeneous in both their reservation utility and valuation for quality, the concern for cannibalization may distort the quality upwards, even for consumers with the highest willingness‐to‐pay for quality. In addition, a low‐quality product may enjoy a higher profit margin than a high‐quality product within the product line. 相似文献
8.
9.
基于CAS理论的企业开放式创新社区在线用户贡献行为研究:以国内知名企业社区为例 总被引:1,自引:0,他引:1
企业开放式创新社区的实践受到了广泛关注,但理论研究还远谈不上完善。本文定量界定了在线用户主动贡献和反应贡献两个行为变量,借鉴复杂适应系统(CAS)理论的研究视角,结合社区用户调研,构建了在线用户贡献行为影响因素模型。以国内知名企业开放式创新社区348个用户样本为调查对象,实证结果显示,用户互惠和社区激励对两种贡献行为均有显著影响,利他动机和社区信任显著影响主动贡献行为,认同动机和用户信任显著影响反应贡献行为。本文对研究结论进行了讨论,就引导社区用户贡献行为提出了管理建议。本文的研究工作丰富了开放式创新社区用户研究的理论视角,为用户贡献行为的深入探索奠定了基础。 相似文献
10.