全文获取类型
收费全文 | 6694篇 |
免费 | 478篇 |
国内免费 | 700篇 |
专业分类
电工技术 | 202篇 |
综合类 | 644篇 |
化学工业 | 123篇 |
金属工艺 | 82篇 |
机械仪表 | 376篇 |
建筑科学 | 200篇 |
矿业工程 | 60篇 |
能源动力 | 7篇 |
轻工业 | 61篇 |
水利工程 | 18篇 |
石油天然气 | 28篇 |
武器工业 | 42篇 |
无线电 | 526篇 |
一般工业技术 | 105篇 |
冶金工业 | 45篇 |
原子能技术 | 7篇 |
自动化技术 | 5346篇 |
出版年
2024年 | 3篇 |
2023年 | 6篇 |
2022年 | 22篇 |
2021年 | 22篇 |
2020年 | 30篇 |
2019年 | 26篇 |
2018年 | 23篇 |
2017年 | 43篇 |
2016年 | 52篇 |
2015年 | 82篇 |
2014年 | 170篇 |
2013年 | 172篇 |
2012年 | 279篇 |
2011年 | 400篇 |
2010年 | 501篇 |
2009年 | 633篇 |
2008年 | 703篇 |
2007年 | 812篇 |
2006年 | 975篇 |
2005年 | 782篇 |
2004年 | 752篇 |
2003年 | 618篇 |
2002年 | 389篇 |
2001年 | 181篇 |
2000年 | 62篇 |
1999年 | 38篇 |
1998年 | 11篇 |
1997年 | 10篇 |
1996年 | 10篇 |
1995年 | 10篇 |
1994年 | 13篇 |
1993年 | 7篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 8篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1985年 | 2篇 |
1984年 | 4篇 |
1982年 | 3篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
排序方式: 共有7872条查询结果,搜索用时 15 毫秒
81.
82.
We present in this paper BP-QL, a novel query language for querying business processes. The BP-QL language is based on an intuitive model of business processes, an abstraction of the emerging BPEL (business process execution language) standard. It allows users to query business processes visually, in a manner very analogous to how such processes are typically specified, and can be employed in a distributed setting, where process components may be provided by distinct providers. 相似文献
83.
A manufacturing XML schema definition and its application to a data management system on the shop floor 总被引:1,自引:0,他引:1
Digitization for sharing knowledge on the shop floor in the machinery industry has been given much attention recently. To help engineers use digitization practically and efficiently, this paper proposes a method based on manufacturing case data that has a direct relation to manufacturing operations. The data are represented in XML schema, as it can be easily applied to Web-based systems on the shop floor. The definitions were made for eight manufacturing methods including machining and welding. The derived definitions consist of four divisions of metadata, work-piece, process and evaluation. Three divisions except for the “process” division are common to the manufacturing methods. The average number of elements for a manufacturing method is about 200. The represented schema is also used to convey knowledge such as operation standards and manufacturing troubleshooting on the shop floor. Using the definitions, a data management system is developed. It is a Web-based Q&A system, in which the engineers specify the manufacturing case data mainly by selecting from the candidates. Then, the system fills in the blank portions and/or shows messages to help complete the case data. The proposed method is evaluated through practical scenarios of arc welding and machining. 相似文献
84.
Elisa Bertino Giovanna Guerrini Marco Mesiti 《Journal of Intelligent Information Systems》2008,30(1):55-92
Measuring the structural similarity between an XML document and a DTD has many relevant applications that range from document
classification and approximate structural queries on XML documents to selective dissemination of XML documents and document
protection. The problem is harder than measuring structural similarity among documents, because a DTD can be considered as
a generator of documents. Thus, the problem is to evaluate the similarity between a document and a set of documents. An effective
structural similarity measure should face different requirements that range from considering the presence and absence of required
elements, as well as the structure and level of the missing and extra elements to vocabulary discrepancies due to the use
of synonymous or syntactically similar tags. In the paper, starting from these requirements, we provide a definition of the
measure and present an algorithm for matching a document against a DTD to obtain their structural similarity. Finally, experimental
results to assess the effectiveness of the approach are presented. 相似文献
85.
Although bundled commodities are largely existed in supermarket, there are few investigations about bundled commodities mining. In this study, interval-valued association rules as a novel and possible approach to solving the bundled commodities mining issue, is proposed. Properties research based on interval-valued association rules is conducted, and an interval-valued rule pattern: F, , is constructed, where F denotes set of interval-valued ruses, and denote the disjunctive operation and conjunctive operation, respectively. Furthermore, one of the properties satisfied by the interval-valued rules: A C = B C and A C = B C A = B, where A, B, C are there different rules, is validated and utilized to mine the bundled commodities. Finally, a large-scale software engineering project relative to interval-valued rule mining is implemented to merge flight testing information about aircrafts which validates the technique of mining bundled commodities can be discovered a special relation between objects. These initial investigations provide a researchable framework for bundled commodities mining. 相似文献
86.
87.
88.
基于XML的数据交换是一种典型的Web应用,通过分析基于服务的数据交换数据,说明在该Web应用中,存在的安全问题和需求,架构一个基于PKI/PMI的安全Web数据交换平台,实现应用层的授权和安全访问控制,并应用在实际中. 相似文献
89.
90.
当用户访问传统的ASP技术制作的论坛,并进行多种操作时,会多次重载页面或在不同页面间跳转。造成用户视觉上的不舒服以及花费较多的等待时间。采用Ajax技术可以很好的解决这样的问题,本文给出了用Ajax技术实现教学论坛部分功能的设计方法,使访问者获得更好的Web体验。 相似文献