全文获取类型
收费全文 | 1557篇 |
免费 | 70篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 18篇 |
综合类 | 2篇 |
化学工业 | 542篇 |
金属工艺 | 46篇 |
机械仪表 | 56篇 |
建筑科学 | 30篇 |
矿业工程 | 4篇 |
能源动力 | 60篇 |
轻工业 | 132篇 |
水利工程 | 2篇 |
石油天然气 | 3篇 |
无线电 | 104篇 |
一般工业技术 | 219篇 |
冶金工业 | 109篇 |
原子能技术 | 6篇 |
自动化技术 | 297篇 |
出版年
2023年 | 12篇 |
2022年 | 88篇 |
2021年 | 92篇 |
2020年 | 35篇 |
2019年 | 41篇 |
2018年 | 37篇 |
2017年 | 54篇 |
2016年 | 61篇 |
2015年 | 49篇 |
2014年 | 85篇 |
2013年 | 121篇 |
2012年 | 76篇 |
2011年 | 83篇 |
2010年 | 71篇 |
2009年 | 71篇 |
2008年 | 78篇 |
2007年 | 49篇 |
2006年 | 56篇 |
2005年 | 32篇 |
2004年 | 37篇 |
2003年 | 42篇 |
2002年 | 21篇 |
2001年 | 14篇 |
2000年 | 18篇 |
1999年 | 13篇 |
1998年 | 21篇 |
1997年 | 24篇 |
1996年 | 22篇 |
1995年 | 19篇 |
1994年 | 18篇 |
1993年 | 17篇 |
1992年 | 14篇 |
1991年 | 14篇 |
1990年 | 7篇 |
1989年 | 6篇 |
1988年 | 14篇 |
1987年 | 7篇 |
1986年 | 4篇 |
1985年 | 7篇 |
1984年 | 9篇 |
1983年 | 18篇 |
1982年 | 6篇 |
1981年 | 8篇 |
1980年 | 10篇 |
1979年 | 5篇 |
1978年 | 7篇 |
1977年 | 7篇 |
1973年 | 4篇 |
1971年 | 6篇 |
1965年 | 3篇 |
排序方式: 共有1630条查询结果,搜索用时 15 毫秒
11.
Wojciech Chmiel Jacek Dańda Andrzej Dziech Sebastian Ernst Piotr Kadłuczka Zbigniew Mikrut Piotr Pawlik Piotr Szwed Igor Wojnicki 《Multimedia Tools and Applications》2016,75(17):10529-10560
Intelligent Transportation Systems (ITS) aim to improve safety, mobility and environmental performance of road transport. The INSIGMA project provides a fresh look at the possible innovations in this field, by enhancing the functionality and accuracy of ITS in urban environments. This paper describes the architecture, sensors, processing algorithms, output modules and advantages of the developed system. A comparison of existing ITS systems has been provided as background. Special attention has been given to performance and privacy issues, as the system includes social aspects such as location monitoring. 相似文献
12.
13.
Bogdan Branowski Leszek Pacholski Michał Rychlik Marek Zabłocki Piotr Pohl 《人机工程学与制造业中的人性因素》2013,23(4):255-266
The article presents a new concept of combining the three dimensions (3D) of a person's manipulation space. The data concern information about the reach of the arms and biomechanical data about limiting the load of a disabled person sitting in a wheelchair. Measurement data were acquired empirically, on original measuring station. The data included, respectively, arms' reach (static and dynamic) or, alternatively, measurements of limiting forces. The obtained data were processed into virtual 3D surfaces of arms' reach and forces. These surfaces provide the required graphic model of anthropotechnical and biomechanical data. Developed model was utilized to perform a virtual analysis of the accessibility of a disabled person to technical means: in a market sale space and in the ergonomic analysis into the space of a personal car. The presented method of 3D graphic modeling of anthropometrical and biomechanical data can be universally applied in ergonomic designing of work stations not only for disabled persons. © 2011 Wiley Periodicals, Inc. 相似文献
14.
Completions of linear time varying singular systems of the formE(t)x(t)+F(t)x(t)=f(t) are explicitly computed using recent results on rational matrix functions. The algorithm and the theory behind it are carefully described. Computational issues are discussed.Research supported in part by the U.S. Army Research Office under DAAL03-89-D-0003, and the National Science Foundation under ECS-9012909. 相似文献
15.
Bioimaging: Shaping Luminescent Properties of Yb3+ and Ho3+ Co‐Doped Upconverting Core–Shell β‐NaYF4 Nanoparticles by Dopant Distribution and Spacing (Small 47/2017) 下载免费PDF全文
16.
A problem of allocating resources of a grid to workflow applications is considered. The problem consists, generally, in allocating
distributed grid resources to tasks of a workflow in such a way that the resource demands of each task are satisfied. Grid
resources are divided into computational resources and network resources. Computational tasks and transmission tasks of a
workflow are distinguished. We present a model of the problem, and an algorithm for finding feasible resource allocations.
A numerical example is included, showing the importance of the resource allocation phase on a grid. Some conclusions and directions
for future research are given. 相似文献
17.
Mobile devices could facilitate human interaction and access to knowledge resources anytime and anywhere. With respect to wide application possibilities of mobile learning, investigating learners’ acceptance towards it is an essential issue. Based on activity theory approach, this research explores positive factors for the acceptance of m-learning systems. In the research, we developed an m-learning system for learners’ knowledge management and invited 152 participants who knew how to use the m-learning system then report on their experience. The results show that enhancing learners’ satisfaction, encouraging learners’ autonomy, empowering system functions, and enriching interaction and communication activities have a significant positive influence on the acceptance of m-learning systems. 相似文献
18.
Roman Palenichka Ahmed Lakhssassi Marek Zaremba 《Engineering Applications of Artificial Intelligence》2011,24(5):822-832
This paper presents a method for multi-scale segmentation of surface data using scale-adaptive region growing. The proposed segmentation algorithm is initiated by an unsupervised learning of optimal seed positions through the surface attribute clustering with a two-criterion score function. The seeds are selected as consecutive local maxima of the clustering map, which is computed by an aggregation of the local isotropic contrast and local variance maps. The proposed method avoids typical segmentation errors caused by an inappropriate choice of seed points and thresholds used in the region-growing algorithm. The scale-adaptive threshold estimate is based on the image local statistics in the neighborhoods of seed points. The performance of this method was evaluated on LiDAR surface images. 相似文献
19.
TSK fuzzy modeling for tool wear condition in turning processes: An experimental study 总被引:2,自引:0,他引:2
This paper presents an experimental study for turning process in machining by using Takagi-Sugeno-Kang (TSK) fuzzy modeling to accomplish the integration of multi-sensor information and tool wear information. It generates fuzzy rules directly from the input-output data acquired from sensors, and provides high accuracy and high reliability of the tool wear prediction over a wide range of cutting conditions. The experimental results show its effectiveness and satisfactory comparisons relative to other artificial intelligence methods. 相似文献
20.
In this paper we present a new algorithm for adaptive prefix coding. Our algorithm encodes a text S of m symbols in O(m) time, i.e., in O(1) amortized time per symbol. The length of the encoded string is bounded above by (H+1)m+O(nlog 2
m) bits where n is the alphabet size and H is the entropy.
This is the first algorithm that adaptively encodes a text in O(m) time and achieves an almost optimal bound on the encoding length in the worst case. Besides that, our algorithm does not
depend on an explicit code tree traversal.
A preliminary version of this paper appeared in the Proceedings of the 2006 IEEE International Symposium on Information Theory
(ISIT 2006).
M. Karpinski’s work partially supported by a DFG grant, Max-Planck Research Prize, and IST grant 14036 (RAND-APX).
Y. Nekrich’s work partially supported by IST grant 14036 (RAND-APX). 相似文献