全文获取类型
收费全文 | 6258篇 |
免费 | 163篇 |
国内免费 | 91篇 |
学科分类
工业技术 | 6512篇 |
出版年
2024年 | 7篇 |
2023年 | 11篇 |
2022年 | 30篇 |
2021年 | 60篇 |
2020年 | 49篇 |
2019年 | 28篇 |
2018年 | 56篇 |
2017年 | 81篇 |
2016年 | 66篇 |
2015年 | 44篇 |
2014年 | 106篇 |
2013年 | 190篇 |
2012年 | 218篇 |
2011年 | 964篇 |
2010年 | 364篇 |
2009年 | 250篇 |
2008年 | 235篇 |
2007年 | 234篇 |
2006年 | 257篇 |
2005年 | 245篇 |
2004年 | 686篇 |
2003年 | 506篇 |
2002年 | 450篇 |
2001年 | 303篇 |
2000年 | 183篇 |
1999年 | 287篇 |
1998年 | 219篇 |
1997年 | 108篇 |
1996年 | 60篇 |
1995年 | 47篇 |
1994年 | 39篇 |
1993年 | 31篇 |
1992年 | 13篇 |
1991年 | 5篇 |
1990年 | 8篇 |
1989年 | 11篇 |
1988年 | 4篇 |
1986年 | 3篇 |
1984年 | 7篇 |
1982年 | 2篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1977年 | 4篇 |
1976年 | 7篇 |
1975年 | 2篇 |
1973年 | 4篇 |
1972年 | 2篇 |
1960年 | 3篇 |
1943年 | 1篇 |
排序方式: 共有6512条查询结果,搜索用时 22 毫秒
71.
72.
73.
LEE Hyeon-deok SON Myeong-jo OH Min-jae LEE Hyung-woo KIM Tae-wan 《中国科学:信息科学(英文版)》2012,(5):1019-1031
In early 2000,large domestic shipyards introduced shipbuilding 3D computer-aided design (CAD) to the hull production design process to define manufacturing and assembly information.The production design process accounts for most of the man-hours (M/H) of the entire design process and is closely connected to yard production because designs must take into account the production schedule of the shipyard,the current state of the dock needed to mount the ship’s block,and supply information.Therefore,many shipyards are investigating the complete automation of the production design process to reduce the M/H for designers.However,these problems are still currently unresolved,and a clear direction is needed for research on the automatic design base of manufacturing rules,batches reflecting changed building specifications,batch updates of boundary information for hull members,and management of the hull model change history to automate the production design process.In this study,a process was developed to aid production design engineers in designing a new ship’s hull block model from that of a similar ship previously built,based on AVEVA Marine.An automation system that uses the similar ship’s hull block model is proposed to reduce M/H and human errors by the production design engineer.First,scheme files holding important information were constructed in a database to automatically update hull block model modifications.Second,for batch updates,the database’s table,including building specifications and the referential integrity of a relational database were compared.In particular,this study focused on reflecting the frequent modification of building specifications and regeneration of boundary information of the adjacent panel due to changes in a specific panel.Third,the rollback function is proposed in which the database (DB) is used to return to the previously designed panels. 相似文献
74.
Hugo Feitosa de Figueirêdo Yuri Almeida Lacerda Anselmo Cardoso de Paiva Marco Antonio Casanova Cláudio de Souza Baptista 《Multimedia Tools and Applications》2012,59(1):279-305
The recent popularity of digital cameras has posed a new problem: how to efficiently store and retrieve the very large number
of digital photos captured and chaotically stored in multiple locations without any annotation. This paper proposes an infrastructure,
called PhotoGeo, which aims at helping users with the people photo annotation, event photo annotation, storage and retrieval
of personal digital photos. To achieve the desired objective, PhotoGeo uses new algorithms that make it possible to annotate
photos with the key metadata to facilitate their retrieval, such as: the people who were shown in the photo (who); where it was captured (where); the date and time of capture (when); and the event that was captured. The paper concludes with a detailed evaluation of these algorithms. 相似文献
75.
76.
77.
78.
传统的电信业务支撑系统不能随外部需求的变化而进行相应的功能重组。本文结合业务能力封装的思想提出了一种基于面向对象的层次着色Petri网的业务支撑系统建模方法。该模型首层Petri给出了电信业务运营管理的总体框架,在次层Petri网子页中对综合计费账务系统的动态流程进行了详细的描述,最后以计费子页的Petri网模型为例,说明了如何提高模型的重用性,证明了该模型是可行的并能有效满足重组的要求。 相似文献
79.
80.