全文获取类型
收费全文 | 1328篇 |
免费 | 138篇 |
国内免费 | 96篇 |
专业分类
电工技术 | 41篇 |
综合类 | 152篇 |
化学工业 | 78篇 |
金属工艺 | 19篇 |
机械仪表 | 66篇 |
建筑科学 | 267篇 |
矿业工程 | 9篇 |
能源动力 | 64篇 |
轻工业 | 8篇 |
水利工程 | 5篇 |
石油天然气 | 22篇 |
武器工业 | 12篇 |
无线电 | 146篇 |
一般工业技术 | 113篇 |
冶金工业 | 17篇 |
原子能技术 | 7篇 |
自动化技术 | 536篇 |
出版年
2024年 | 11篇 |
2023年 | 19篇 |
2022年 | 17篇 |
2021年 | 27篇 |
2020年 | 34篇 |
2019年 | 33篇 |
2018年 | 20篇 |
2017年 | 42篇 |
2016年 | 38篇 |
2015年 | 62篇 |
2014年 | 67篇 |
2013年 | 73篇 |
2012年 | 106篇 |
2011年 | 108篇 |
2010年 | 88篇 |
2009年 | 113篇 |
2008年 | 70篇 |
2007年 | 96篇 |
2006年 | 88篇 |
2005年 | 77篇 |
2004年 | 57篇 |
2003年 | 50篇 |
2002年 | 57篇 |
2001年 | 37篇 |
2000年 | 38篇 |
1999年 | 24篇 |
1998年 | 31篇 |
1997年 | 19篇 |
1996年 | 16篇 |
1995年 | 16篇 |
1994年 | 6篇 |
1993年 | 7篇 |
1992年 | 1篇 |
1989年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有1562条查询结果,搜索用时 15 毫秒
1.
本文描述在Unix环境下开发的通用绘图软件NuSlide中的图形用户界面的设计思想和实际方法。其特点是基子面向对象的技术,提供多窗口、菜单驱动、选择面板、键盘输入等多种才法。该图形用户界面具有灵活性、可扩充性和易使用性。 相似文献
2.
Xiao-Ying Wang Jonathan M. Garibaldi Benjamin Bird Michael W. George 《Applied Intelligence》2007,27(3):237-248
Recently Fourier Transform Infrared (FTIR) spectroscopic imaging has been used as a tool to detect the changes in cellular
composition that may reflect the onset of a disease. This approach has been investigated as a mean of monitoring the change
of the biochemical composition of cells and providing a diagnostic tool for various human cancers and other diseases. The
discrimination between different types of tissue based upon spectroscopic data is often achieved using various multivariate
clustering techniques. However, the number of clusters is a common unknown feature for the clustering methods, such as hierarchical
cluster analysis, k-means and fuzzy c-means. In this study, we apply a FCM based clustering algorithm to obtain the best number
of clusters as given by the minimum validity index value. This often results in an excessive number of clusters being created
due to the complexity of this biochemical system. A novel method to automatically merge clusters was developed to try to address
this problem. Three lymph node tissue sections were examined to evaluate our new method. These results showed that this approach
can merge the clusters which have similar biochemistry. Consequently, the overall algorithm automatically identifies clusters
that accurately match the main tissue types that are independently determined by the clinician. 相似文献
3.
4.
使用自粘性防水卷材对带钢副框的铝合金门窗窗边进行粘接,以防止雨水通过副框与墙体之间的缝隙渗漏到室内,重点介绍了详细的施工措施。 相似文献
5.
An approximate method is presented for predicting the effect of a louvered blind on the centre‐glass thermal performance of a fenestration. The method combines a one‐dimensional heat transfer model with data from a numerical simulation of the window and blind. Sample results for a blind mounted on the indoor surface of a window show the effect of blind slat angle on heat transmission. Both summer and winter conditions are considered. The results show that a louvered blind can improve the U‐value of a standard double‐glazed window by up to 37%. Also, the radiation heat exchange with the room can be dramatically reduced (by up to 60%), which will improve the level of occupant comfort. However, there was found to be a trade‐off between U‐value and occupant comfort; placing the blind closer to the window improves the U‐value, but increases the radiation heat exchange with the room. The predictions from the present simplified method compare well with results from a full two‐dimensional computational fluid dynamics solution of the conjugate blind/window interaction. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
6.
李红宇 《数字社区&智能家居》2007,(17)
介绍了在VC .net的运行环境下运用拆分窗口功能实现界面切换的步骤及具体实现方法,并给出了关键的实现函数与事例. 相似文献
7.
Joel 《Journal of Parallel and Distributed Computing》2005,65(12):1601-1606
Lee and Batcher have designed networks that efficiently merge k separately provided sorted sequences of known lengths totalling n. We show that the design is still possible, and in fact easier to describe, if we do not make use of the lengths, or even the directions of monotonicity, of the individual sequences—the sequences can be provided in a single undelimited concatenation of length n. The depth of the simplest resulting network to sort sequences that are “k-tonic” and of length n is , generalizing Batcher's 1968 results for the extreme values of k (k=2 corresponding to merging, and k=n/2 corresponding to general sorting).The exposition is self-contained and can serve even as an introduction to sorting networks and Batcher's results. 相似文献
8.
徐云生 《昆明理工大学学报(自然科学版)》1996,21(6):21-25
基于太阳辐射的光变特性和多层薄膜材料的变色效应,分析了新型太阳能节能窗对热候,冷候和温候空调的工作原理,重点讨论了可实现外加参量的动态调节透光性的薄膜材料的性能。 相似文献
9.
Image segmentation towards new image representation methods 总被引:1,自引:0,他引:1
Diogo Cortez Paulo Nunes Manuel Menezes de Sequeira Fernando Pereira 《Signal Processing: Image Communication》1995,6(6):485-498
Very low bit-rate video coding has recently become one of the most important areas of image communication and a large variety of applications have already been identified. Since conventional approaches are reaching a saturation point, in terms of coding efficiency, a new generation of video coding techniques, aiming at a deeper “understanding” of the image, is being studied. In this context, image analysis, particularly the identification of objects or regions in images (segmentation), is a very important step. This paper describes a segmentation algorithm based on split and merge. Images are first simplified using mathematical morphology operators, which eliminate perceptually less relevant details. The simplified image is then split according to a quad tree structure and the resulting regions are finally merged in three steps: merge, elimination of small regions and control of the number of regions. 相似文献
10.
软件配置管理包括对代码、文档、数据等的管理,其优劣受限于项目成员的实际操作。开发人员对于工作区如何使用;成员之间的代码是不是可以及时更新与同步;怎样使用分支,如何进行变更合并,才能减少物理空间浪费和事件延迟。这些问题在实际的项目开发中往往被忽视,亦或团队并没有对成员行为作细节的规范,因而许多软件项目出现了工期推迟或代码质量不高等问题。为此提出了一系列管理措施,通过优化软件配置管理规范项目各成员的行为,以保证高效的软件配置管理的实施。 相似文献