全文获取类型
收费全文 | 13286篇 |
免费 | 425篇 |
国内免费 | 486篇 |
专业分类
教育 | 9303篇 |
科学研究 | 2242篇 |
各国文化 | 110篇 |
体育 | 511篇 |
综合类 | 830篇 |
文化理论 | 21篇 |
信息传播 | 1180篇 |
出版年
2024年 | 8篇 |
2023年 | 99篇 |
2022年 | 160篇 |
2021年 | 299篇 |
2020年 | 422篇 |
2019年 | 348篇 |
2018年 | 291篇 |
2017年 | 279篇 |
2016年 | 350篇 |
2015年 | 398篇 |
2014年 | 423篇 |
2013年 | 844篇 |
2012年 | 980篇 |
2011年 | 970篇 |
2010年 | 523篇 |
2009年 | 654篇 |
2008年 | 918篇 |
2007年 | 1056篇 |
2006年 | 1153篇 |
2005年 | 966篇 |
2004年 | 818篇 |
2003年 | 611篇 |
2002年 | 462篇 |
2001年 | 313篇 |
2000年 | 257篇 |
1999年 | 132篇 |
1998年 | 85篇 |
1997年 | 82篇 |
1996年 | 71篇 |
1995年 | 40篇 |
1994年 | 39篇 |
1993年 | 37篇 |
1992年 | 30篇 |
1991年 | 21篇 |
1990年 | 15篇 |
1989年 | 21篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1985年 | 5篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
952.
The aim of this paper is to present a reliability modeling and analysis of a two-unit system of a continuous casting (CC) plant. Real maintenance data of a steel production plant have been used for the purpose. Three types of failures were noted: repairable, replaceable and reconditioning/reinstallation. The two-unit system is operating in parallel, on full-reduced installed capacity. Upon the unit failure, an inspection is carried out to decide the type of maintenance task to be performed. Optimized reliability indices of the plant such as mean time to system failure, availability, expected busy periods of the repairman for various maintenance tasks, expected number of visits by the repairman, expected number of repairs, replacements and reconditioning/reinstallation are obtained. Semi-Markov processes and regenerative point techniques are used for the analysis. Profit incurred to the CC plant is also evaluated and related graphs are plotted to demonstrate the results. 相似文献
953.
Hsin Hsin ChangAuthor Vitae I. Chen WangAuthor Vitae 《International Journal of Information Management》2011,31(2):171-182
Enterprise Information Portals (EIPs) have been widely adopted as platforms for the integration of knowledge management and information technology (IT). This study has been conducted from the knowledge management perspective in order to examine the influence of EIPs on collaborative commerce in the automobile industry. This study explores the integration of internal and external business processes and the coordination of collaborative design teams. An initial qualitative investigation explores the practical applications of an EIP in an automobile company. A research model is then formulated and tested using a questionnaire survey of the R&D department of a motor company in Taiwan. The results of the data analysis reveal that presence of EIPs can help a company realize the benefits of c-commerce. EIPs also can improve collaborative commerce performance by promoting the degree of integration of the enterprise process and by strengthening the process innovation and communication of collaborative design teams. The results suggest that managers should reinforce important factors, including knowledge management tools, process integration, and the quality of design teams, in order to achieve success in collaborative commerce. 相似文献
954.
Analyzing the impact of knowledge management on CRM success: The mediating effects of organizational factors 总被引:1,自引:0,他引:1
Aurora Garrido-MorenoAuthor Vitae Antonio Padilla-MeléndezAuthor Vitae 《International Journal of Information Management》2011,31(5):437-444
Customer relationship management (CRM) and knowledge management (KM) have become key strategic tool for all companies, especially in the current competitive environment. Moreover, customer knowledge is an important issue for CRM implementation. Reviewing the literature, we found many studies that analyze the crucial role played by KM initiatives as determinants of the success of CRM. Moreover, we found also diverse studies that show high rates of failure when implementing that strategy, so there is still no integrated conceptual framework to guide companies to their successful implementation. In this paper, with data of 153 Spanish hotels, we examine the relationships between KM and CRM success using a structural equation model. The main contribution is that having knowledge management capabilities is not sufficient for the success of CRM, but there are other factors to consider. In particular, organizational factors indeed impact CRM success and they appear to be intermediaries of the impact of other factors (KM capabilities/technological/customer orientation factors) in the success of CRM (in financial and marketing terms). 相似文献
955.
简单介绍了射频识别的基本原理,特别是在室内定位中的应用。重点介绍了LANDMARC室内定位系统理论及其改进,使其可以更好地应用于实际环境。实验结果表明,改进的算法比原来的算法在定位精度上提高了10%~30%。 相似文献
956.
中国通过普及食盐加碘(Universal SaltIodization,USI)消除碘缺乏病,并持续巩固了防治成果。随着碘缺乏病防治工作的顺利开展,高水碘问题也引起了关注。为了了解和掌握我国水源性高碘问题及干预状况,开展了相关调查。通过查阅有关文献资料和访谈,了解高水碘地区的分布状况、监测工作进展情况、采取的干预措施等;通过深入高碘县的高碘村,了解停供碘盐和改水措施的落实、群众的认知等情况;并请县级盐业部门人员参加,探讨供应不加碘食盐的措施和对策。本报告的主要内容包括:高水碘地区的分布状况,监测工作进展情况,采取的干预措施及其落实情况,存在问题和建议等。 相似文献
957.
958.
本文研究一种安装电力机车上用于实时检测机车运行状态的无线传感器系统,它可将传感器安装在机车需要进行检测各个监测点的上,传感器实时将监测点运行状态数据发送回协调器,通过上位机去读取协调器中的内容,以了解机车各部件的运转状况。 相似文献
959.
960.
采用过氧化氢作为氧化剂制备聚合硫酸铁,探讨了硫酸用量、过氧化氢用量、反应温度这三个反应条件对产品各项质量指标的影响。结果表明,当硫酸与硫酸亚铁的摩尔比在0.31~0.41之间,过氧化氢与硫酸亚铁的摩尔比为2∶1,反应温度控制在20~35℃之间,制备所得的聚合硫酸铁的各项质量指标均符合国家标准。 相似文献