全文获取类型
收费全文 | 8992篇 |
免费 | 670篇 |
国内免费 | 360篇 |
专业分类
电工技术 | 417篇 |
综合类 | 602篇 |
化学工业 | 1516篇 |
金属工艺 | 546篇 |
机械仪表 | 565篇 |
建筑科学 | 765篇 |
矿业工程 | 184篇 |
能源动力 | 198篇 |
轻工业 | 680篇 |
水利工程 | 171篇 |
石油天然气 | 586篇 |
武器工业 | 61篇 |
无线电 | 933篇 |
一般工业技术 | 1102篇 |
冶金工业 | 415篇 |
原子能技术 | 166篇 |
自动化技术 | 1115篇 |
出版年
2024年 | 28篇 |
2023年 | 111篇 |
2022年 | 242篇 |
2021年 | 342篇 |
2020年 | 261篇 |
2019年 | 225篇 |
2018年 | 284篇 |
2017年 | 302篇 |
2016年 | 242篇 |
2015年 | 339篇 |
2014年 | 385篇 |
2013年 | 540篇 |
2012年 | 598篇 |
2011年 | 623篇 |
2010年 | 550篇 |
2009年 | 445篇 |
2008年 | 473篇 |
2007年 | 447篇 |
2006年 | 505篇 |
2005年 | 418篇 |
2004年 | 296篇 |
2003年 | 236篇 |
2002年 | 190篇 |
2001年 | 186篇 |
2000年 | 214篇 |
1999年 | 242篇 |
1998年 | 221篇 |
1997年 | 187篇 |
1996年 | 176篇 |
1995年 | 156篇 |
1994年 | 108篇 |
1993年 | 97篇 |
1992年 | 85篇 |
1991年 | 50篇 |
1990年 | 59篇 |
1989年 | 31篇 |
1988年 | 25篇 |
1987年 | 16篇 |
1986年 | 21篇 |
1985年 | 16篇 |
1984年 | 12篇 |
1983年 | 11篇 |
1982年 | 7篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1977年 | 3篇 |
1976年 | 2篇 |
1975年 | 2篇 |
1965年 | 1篇 |
1959年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
EFFECTOFPROGRESSIVEAGINGTREATMENTONONTHEPROPERTIESANDMICROSTRUCTUREOFTHEHIGH-HARDELASTICNICKEL-CHROMIUM-ALUMINIUMALLOY¥LIUGui... 相似文献
92.
对工业纯铁、45钢和3Cr2W8V钢的低真空铬钛共渗进行了研究,探讨了共渗层的组织结构、生长过程以及温度、时间等工艺因素的影响。 相似文献
93.
In this paper, we consider the synchronization of a class of nonlinear network flow systems. Motivated by air distribution problem in air conditioning and mechanical ventilation (ACMV) systems, we propose a class of coupled nonlinear multi‐agent systems that can model a wide class of network flow systems, including air flow in ACMV systems, water flow in irrigation systems, traffic flow in transportation systems, and so on. Then we consider the synchronization problem for the class of nonlinear multi‐agent systems and propose cooperative controllers for the system. Based on graph theory, we derive conditions on the initial values of the state and the control input such that synchronization can be achieved. An application to air ventilation is provided to demonstrate the effectiveness of the cooperative controllers. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
94.
In this work, we have put forth two different protocols to address a concrete secure multi-party computational (MPC) problem related to a triangle, of which the coordinates of the three vertices are confidentially kept by the three participants, respectively. The three parties wish to collaboratively compute the area of this triangle while preserving their own coordinate privacy. As one of the merits, our protocols employ weaker assumptions of the existence of pseudorandom generators. In particular, unlike massive secure MPC protocols that rely a lot on oblivious transfer, ours utilize a new computing idea called “pseudorandom-then-rounding” method to avoid this burdensome obstacle. The two protocols are based on different theorems, while they both make use of the same underlying idea. At last, we provide a detailed proof for the first protocol by a series of security reductions of our newly defined games, which seems somewhat stronger than the previous simulation-based proofs and a proof sketch for the second one. Analysis and discussion about the reasons are provided as well to round off our work. 相似文献
95.
96.
The MapReduce framework has become the de facto standard for big data processing due to its attractive features and abilities. One is that it automatically parallelizes a job into multiple tasks and transparently handles task execution on a large cluster of commodity machines. The increasing heterogeneity of distributed environments may result in a few straggling tasks, which prolong job completion. Speculative execution is proposed to mitigate stragglers. However, the existing speculative execution mechanism could not work efficiently as many speculative tasks are still slower than their original tasks. In this paper, we explore an approach to increase the efficiency of speculative execution, and further improve MapReduce performance. We propose the Partial Speculative Execution (PSE) strategy to make speculative tasks start from the checkpoint. By leveraging the checkpoint of original tasks, PSE can eliminate the costs of re-reading, re-copying, and re-computing the processed data. We implement PSE in Hadoop, and evaluate its performance in terms of job completion time and the efficiency of speculative execution under several kinds of classical workloads. Experimental results show that, in heterogeneous environments with stragglers, PSE completes jobs 56 % faster than that with no speculation and 12 % faster than that with LATE, an improved speculative execution algorithm. In addition, on average PSE can improve the efficiency of speculative execution by 24 % compared to LATE. 相似文献
97.
98.
99.
随着IPv6的部署和网络技术的发展,一些基于新型攻击方式的网络入侵的事件也开始出现.本文基于Snort构架,设计了一个针对IPv6体系的入侵检测系统,对系统所属的各功能模块进行了分析,提出了详细的设计方案. 相似文献
100.
李丽华 《计算机光盘软件与应用》2010,(12)
网页设计是近二十年以来意义深远的新兴设计领域,但当前在网页设计中存在着一些问题,本文探讨了视觉元素在网页设计中的使用原则和方法,以期在一定程度上解决当前网页设计中存在的问题. 相似文献