全文获取类型
收费全文 | 5360篇 |
免费 | 316篇 |
国内免费 | 134篇 |
专业分类
电工技术 | 349篇 |
综合类 | 184篇 |
化学工业 | 550篇 |
金属工艺 | 176篇 |
机械仪表 | 440篇 |
建筑科学 | 397篇 |
矿业工程 | 92篇 |
能源动力 | 464篇 |
轻工业 | 97篇 |
水利工程 | 95篇 |
石油天然气 | 256篇 |
武器工业 | 58篇 |
无线电 | 867篇 |
一般工业技术 | 470篇 |
冶金工业 | 227篇 |
原子能技术 | 48篇 |
自动化技术 | 1040篇 |
出版年
2024年 | 17篇 |
2023年 | 54篇 |
2022年 | 93篇 |
2021年 | 104篇 |
2020年 | 126篇 |
2019年 | 103篇 |
2018年 | 82篇 |
2017年 | 111篇 |
2016年 | 160篇 |
2015年 | 156篇 |
2014年 | 319篇 |
2013年 | 295篇 |
2012年 | 308篇 |
2011年 | 390篇 |
2010年 | 291篇 |
2009年 | 337篇 |
2008年 | 235篇 |
2007年 | 329篇 |
2006年 | 278篇 |
2005年 | 265篇 |
2004年 | 260篇 |
2003年 | 218篇 |
2002年 | 203篇 |
2001年 | 151篇 |
2000年 | 162篇 |
1999年 | 141篇 |
1998年 | 113篇 |
1997年 | 99篇 |
1996年 | 82篇 |
1995年 | 64篇 |
1994年 | 40篇 |
1993年 | 31篇 |
1992年 | 40篇 |
1991年 | 35篇 |
1990年 | 28篇 |
1989年 | 25篇 |
1988年 | 22篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 18篇 |
1983年 | 6篇 |
1982年 | 4篇 |
排序方式: 共有5810条查询结果,搜索用时 0 毫秒
1.
2.
Semantic search is gradually establishing itself as the next generation search paradigm, which meets better a wider range of information needs, as compared to traditional full-text search. At the same time, however, expanding search towards document structure and external, formal knowledge sources (e.g. LOD resources) remains challenging, especially with respect to efficiency, usability, and scalability.This paper introduces Mímir—an open-source framework for integrated semantic search over text, document structure, linguistic annotations, and formal semantic knowledge. Mímir supports complex structural queries, as well as basic keyword search.Exploratory search and sense-making are supported through information visualisation interfaces, such as co-occurrence matrices and term clouds. There is also an interactive retrieval interface, where users can save, refine, and analyse the results of a semantic search over time. The more well-studied precision-oriented information seeking searches are also well supported.The generic and extensible nature of the Mímir platform is demonstrated through three different, real-world applications, one of which required indexing and search over tens of millions of documents and fifty to hundred times as many semantic annotations. Scaling up to over 150 million documents was also accomplished, via index federation and cloud-based deployment. 相似文献
3.
《Calphad》2015
This paper presents an overview and examples of material design and development using (1) classical thermodynamics; (2) CALPHAD (calculation of phase diagrams) modeling; and (3) Integrated Computational Materials Engineering (ICME) approaches. Although the examples are given in lightweight aluminum and magnesium alloys for structural applications, the fundamental methodology and modeling principles are applicable to all materials and engineering applications. The examples in this paper have demonstrated the effectiveness and limitations of classical thermodynamics in solving specific problems (such as nucleation during solidification and solid-state precipitation in aluminum alloys). Computational thermodynamics and CALPHAD modeling, when combined with critical experimental validation, have been used to guide the selection and design of new magnesium alloys for elevated-temperature applications. The future of material design and development will be based on a holistic ICME approach. However, key challenges exist in many aspects of ICME framework, such as the lack of diffusion/mobility databases for many materials systems, limitation of current microstructural modeling capability and integration tools for simulation codes of different length scales. 相似文献
4.
An engineered variant of the yeast Pichia pastoris was used to produce the potential malaria vaccine D1M1. This paper describes the implementation of an expanded bed adsorption chromatography step into a sequential cultivation process of the yeast in order to link protein expression, cell release, and product capture of the secreted protein in a fully automated plant. The process is operated with a semi-continuous strategy for an integrated production. Process improvements have been achieved using design of experiments. Resulting purities of product achieved up to 87% with recoveries of 51% in a single downstream operation. Furthermore, a multivariate analysis of historical batch data was used to develop a golden batch model for process monitoring. 相似文献
5.
为促进互联网的良性发展,要使设备制造商、电信运营商、虚拟运营商/集团用户、内容提供商和最终用户构成一条互联网业务价值链,价值链的创建对互联网接入设备提出了更高的要求,华为公司的Quid-wayTMA8010Expert多业务综合接入平台可构建宽带城域网分组语音解决方案、可平滑演进为下一代网络中的媒体网关、提供窄带价值链、提供唯一号码业务以及实现多业务综合接入。 相似文献
6.
7.
Matthias Zobel Joachim Denzler Benno Heigl Elmar Nöth Dietrich Paulus Jochen Schmidt Georg Stemmer 《Machine Vision and Applications》2003,14(1):26-34
Abstract. This contribution introduces MOBSY, a fully integrated, autonomous mobile service robot system. It acts as an automatic dialogue-based
receptionist for visitors to our institute. MOBSY incorporates many techniques from different research areas into one working
stand-alone system. The techniques involved range from computer vision over speech understanding to classical robotics.
Along with the two main aspects of vision and speech, we also focus on the integration aspect, both on the methodological
and on the technical level. We describe the task and the techniques involved. Finally, we discuss the experiences that we
gained with MOBSY during a live performance at our institute. 相似文献
8.
本文在分析CIMS环境中数据模式冲关类型的基础上,提出一种互连数据库系统模式结构,论述了在异构数据库集成中解决模式冲突的基本方法.在这种方法体系中,不需要建立整个企业的全局数据模式,各局部DBA以简单的方式定义应用所需的模式变换,系统根据这种定义自动完成各种转换,使用户看到的模式和数据结果与应用要求的一致. 相似文献
9.
蒙特卡罗方法在空间辐射制冷器理论分析及热设计计算中的应用 总被引:1,自引:1,他引:0
介绍了二级抛物面型辐射制冷器的热物理模型及用蒙特卡罗方法数值模拟解决其热流理论和辐射热耦合表面(漫发射、镜反射)辐射热交换的处理方法。 相似文献
10.