全文获取类型
收费全文 | 2780篇 |
免费 | 325篇 |
国内免费 | 182篇 |
专业分类
电工技术 | 195篇 |
技术理论 | 2篇 |
综合类 | 222篇 |
化学工业 | 75篇 |
金属工艺 | 84篇 |
机械仪表 | 82篇 |
建筑科学 | 849篇 |
矿业工程 | 56篇 |
能源动力 | 116篇 |
轻工业 | 42篇 |
水利工程 | 88篇 |
石油天然气 | 64篇 |
武器工业 | 22篇 |
无线电 | 374篇 |
一般工业技术 | 202篇 |
冶金工业 | 27篇 |
原子能技术 | 14篇 |
自动化技术 | 773篇 |
出版年
2024年 | 10篇 |
2023年 | 67篇 |
2022年 | 95篇 |
2021年 | 138篇 |
2020年 | 152篇 |
2019年 | 110篇 |
2018年 | 103篇 |
2017年 | 121篇 |
2016年 | 128篇 |
2015年 | 105篇 |
2014年 | 206篇 |
2013年 | 277篇 |
2012年 | 196篇 |
2011年 | 204篇 |
2010年 | 151篇 |
2009年 | 158篇 |
2008年 | 128篇 |
2007年 | 158篇 |
2006年 | 142篇 |
2005年 | 147篇 |
2004年 | 133篇 |
2003年 | 83篇 |
2002年 | 80篇 |
2001年 | 42篇 |
2000年 | 57篇 |
1999年 | 33篇 |
1998年 | 13篇 |
1997年 | 8篇 |
1996年 | 13篇 |
1995年 | 9篇 |
1994年 | 5篇 |
1993年 | 5篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有3287条查询结果,搜索用时 15 毫秒
1.
For the past decade, the Taiwanese government has applied the policy of “North heavy, South light” to put more emphasis on development in northern Taiwan instead of the south. This has resulted in uneven development between the northern and southern regions, especially when introducing, developing, and supporting high technology and resource allocation in education. Industry clusters have become the centerpiece of economic development policy in many parts of the world. In this study, it is assumed that there are two categories of less-advantaged regions in Taiwan: (1) older industrialized regions dominated by labor-intensive/capital-intensive industries, and (2) industrial regions that have merged with potential high-technology small firms but still lack infrastructure. This study discusses the following points: (a) How do industrial clusters work in action? (b) What barriers do less-advantaged industrial clusters face? (c) What action strategies promote less-advantaged industrial clusters? 相似文献
2.
本文研究了加法复合布尔函数和乘法复合布尔函数,在平衡性、k次项系数、K次扩散准则(PC)、相关免疫 性(CI)、Walsh谱、代数次数、小项分布等方面得到了一批新结果。 相似文献
3.
4.
5.
6.
Thermal sprayed aluminum and zinc provide long-term (> 20 years to first maintenance) corrosion control coatings. However,
this application is usually more expensive than painting or galvanizing if thermal spraying (metallizing) is not integrated
into the design and fabrication phases of new construction and repair projects. Aluminum and zinc metallized coatings are
tough enough to withstand fabrication, transportation, and assembly operations. The improved capabilities and productivity
of metallizing equipment for aluminum and zinc spraying are a major factor in their current cost competitiveness. The net
result is that the cost difference between metallizing, paint, and galvanizing is getting closer every day. Even though the
initial application cost of metallizing may be higher, the life cycle cost (LCC) and average equivalent annual costs (AEAC)
are lower than paint coating systems. Metallizing LCCs, when properly engineered into the construction schedule, are equal
to or less than paint coating LCCs. This article summarizes some metallizing considerations for installing improved corrosion
control coating systems in new construction and in maintenance and repair of infrastructure.
Editor’s Note: The following constants have been used to convert between English and Metric dimensions: 1ft2-0.0929 m2; 1lb/ft2-4.89 kg/m2; 1 mil=0.025mm.
Presented at the 5th National Thermal Spray Conference (NTSC-93), Infrastructure Maintenance and Repair Session, 10 June 1993,
Anaheim, CA. 相似文献
7.
《Information & Management》2014,51(8):1031-1042
Customer relationship management (CRM) has become one of the most influential technologies in the world, and companies are increasingly implementing it to create value. However, despite significant investment in CRM technology infrastructure, empirical research offers inconsistent support for its positive impact on performance. This study develops and tests a research model analyzing the process through which CRM technology infrastructure translates into organizational performance, drawing on the resource-based view (RBV) and the knowledge-based view (KBV) of the firm. Based on an international sample of 125 hotels, the results suggest that organizational commitment and knowledge management fully mediate this process. 相似文献
8.
9.
鉴于基础设施系统对社会生产和人民生活的重要性,分析基础设施系统的脆弱性,提出相应的抗干扰措施和改进策略,提高基础设施系统的可靠性,成为了当前研究的一个热点课题。基于此,在对基础设施系统脆弱性分析成果的基础上,从方法论的角度探讨了关联基础设施系统的脆弱性,并以华中地区某城市电力—供水网络为例分析了网络在节点级联故障下的脆弱性,为控制基础设施系统的级联故障、增强系统的抗干扰能力提供决策支持。 相似文献
10.
Legacy system migration to the cloud brings both great challenges and benefits, so there exist various academic research and industrial applications on legacy system migration to the cloud. By analyzing the research achievements and application status,we divide the existing migration methods into three strategies according to the cloud service models integrally. Different processes need to be considered for different migration strategies, and different tasks will be involved accordingly. The similarities and differences between the migration strategies are discussed, and the challenges and future work about legacy system migration to the cloud are proposed. The aim of this paper is to provide an overall presentation for legacy system migration to the cloud and identify important challenges and future research directions. 相似文献