全文获取类型
收费全文 | 3565篇 |
免费 | 133篇 |
国内免费 | 102篇 |
专业分类
电工技术 | 90篇 |
综合类 | 260篇 |
化学工业 | 151篇 |
金属工艺 | 506篇 |
机械仪表 | 833篇 |
建筑科学 | 151篇 |
矿业工程 | 142篇 |
能源动力 | 52篇 |
轻工业 | 105篇 |
水利工程 | 17篇 |
石油天然气 | 116篇 |
武器工业 | 20篇 |
无线电 | 155篇 |
一般工业技术 | 244篇 |
冶金工业 | 82篇 |
原子能技术 | 10篇 |
自动化技术 | 866篇 |
出版年
2024年 | 9篇 |
2023年 | 45篇 |
2022年 | 65篇 |
2021年 | 75篇 |
2020年 | 82篇 |
2019年 | 55篇 |
2018年 | 54篇 |
2017年 | 73篇 |
2016年 | 107篇 |
2015年 | 94篇 |
2014年 | 194篇 |
2013年 | 177篇 |
2012年 | 225篇 |
2011年 | 267篇 |
2010年 | 189篇 |
2009年 | 196篇 |
2008年 | 195篇 |
2007年 | 207篇 |
2006年 | 208篇 |
2005年 | 165篇 |
2004年 | 156篇 |
2003年 | 158篇 |
2002年 | 129篇 |
2001年 | 103篇 |
2000年 | 99篇 |
1999年 | 71篇 |
1998年 | 72篇 |
1997年 | 59篇 |
1996年 | 42篇 |
1995年 | 43篇 |
1994年 | 36篇 |
1993年 | 22篇 |
1992年 | 13篇 |
1991年 | 14篇 |
1990年 | 9篇 |
1989年 | 14篇 |
1988年 | 13篇 |
1987年 | 10篇 |
1986年 | 8篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1983年 | 16篇 |
1982年 | 8篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1965年 | 1篇 |
1963年 | 1篇 |
1960年 | 1篇 |
排序方式: 共有3800条查询结果,搜索用时 15 毫秒
1.
Gabriel Wainer 《Software》2002,32(13):1261-1306
The features of a toolkit for modeling and simulation based on the DEVS formalism are presented. The tool is built as a set of independent software pieces running on different platforms. Not only are the main characteristics of the environment presented, a focus on its use is also considered by inclusion of application examples for a variety of problems. Many models can be defined in an automated fashion, simplifying the construction of new models and easing their verification. The use of this formal approach has allowed the development of safe and cost‐effective simulations, significantly reducing development time. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
2.
Some therapists hold that the Bobo and other aggressive toys should be excluded from the playroom as they elicit acting-out behavior that is transferred to the world outside the playroom. However, many therapists view the inclusion of these items as imperative elements that facilitate positive growth and maturation in the child. Interviews with authorities in the field of play therapy support the position that the inclusion of the Bobo is not only useful, but a therapeutic necessity. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
3.
Torsten Bohlin Stefan F. Graebe 《International Journal of Adaptive Control and Signal Processing》1995,9(6):465-490
Grey box identification refers to the practice of identifying dynamical systems in model structures exploiting partial prior information. This contribution reviews a method for stochastic grey box identification and surveys experiences and lessons of applying it to a number of industrial processes. Issues to be addressed include advantages and costs of introducing stochastics into the model, the question of what contribution must be expected from the model designer as opposed to what can be formalized in computer algorithms, and an outlook on future plans to resolve present shortcomings. 相似文献
4.
Predictive Maintenance can provide an increase in safety, quality and availability in industrial plants. However, the setting up of a Predictive Maintenance Programme is a strategic decision that until now has lacked analysis of questions related to its setting up, management and control. In this paper, an evaluation system is proposed that carries out the decision making in relation to the feasibility of the setting up. The evaluation system uses a combination of tools belonging to operational research such as: Analytic Hierarchy Process, decision rules and Bayesian tools. This system is a help tool available to the managers of Predictive Maintenance Programmes which can both increase the number of Predictive Maintenance Programmes set up and avoid the failure of these programmes. The Evaluation System has been tested in a petrochemical plant and in a food industry. 相似文献
5.
介绍了一种生产效率高、加工质量稳定、利用单片机控制液压传动系列带式输送机托辊管筒自动加工机床的设计过程。 相似文献
6.
常晓俊 《机械工程与自动化》2003,(2):22-23
介绍了数控机床脉冲插补法与数字增量插补法的基本原理,分析了各自的特点并指出了其各自的应用范围。 相似文献
7.
Teaching-Material Design Center: An ontology-based system for customizing reusable e-materials 总被引:2,自引:1,他引:1
Use of electronic teaching materials (e-material) to support teaching is a trend. e-Material design is therefore an important issue. Currently, most e-material providers offer a package of solutions for different purposes. However, not all teachers and learners need everything from a single package. A preferable alternative is to find useful material from different packages and combine them for a particular course. Currently, most educators collect the material manually, which is time-consuming and may result in missed material. In this paper, we describe a system – the Teaching-Material Design Center, which follows the standard of Sharable Content Object Reference Model – to separate e-material for use as teaching templates and learning objects and to label the material with use of semantic metadata for searching. This system can find existing teaching templates and learning objects for e-material designers and provide a convenient environment for constructing customized e-material for different requirements. We describe the implementation and evaluation of the proposed system for a course. Our system is efficient in finding teaching templates and learning objects and shortening the e-material development process. 相似文献
8.
9.
大规模定制为生产带来了变革和影响。针对新的生产方式的要求,根据推动大规模定制的过程方法和技术来分析他们对于质量控制产生的影响和要求,给出了大规模定制条件下的质量控制系统的建议,并给出了一个简要的系统模型。 相似文献
10.
气弹簧后端省去封头,而用缸体直接封口,杜绝了漏气,强化了结构。文章着重介绍了实现这一结构的径向进给封口工具及工艺。 相似文献