全文获取类型
收费全文 | 1811篇 |
免费 | 89篇 |
国内免费 | 4篇 |
专业分类
电工技术 | 26篇 |
综合类 | 1篇 |
化学工业 | 487篇 |
金属工艺 | 25篇 |
机械仪表 | 32篇 |
建筑科学 | 66篇 |
矿业工程 | 3篇 |
能源动力 | 55篇 |
轻工业 | 153篇 |
水利工程 | 14篇 |
石油天然气 | 10篇 |
无线电 | 139篇 |
一般工业技术 | 314篇 |
冶金工业 | 251篇 |
原子能技术 | 24篇 |
自动化技术 | 304篇 |
出版年
2023年 | 23篇 |
2022年 | 74篇 |
2021年 | 61篇 |
2020年 | 41篇 |
2019年 | 53篇 |
2018年 | 51篇 |
2017年 | 52篇 |
2016年 | 70篇 |
2015年 | 48篇 |
2014年 | 60篇 |
2013年 | 130篇 |
2012年 | 95篇 |
2011年 | 107篇 |
2010年 | 66篇 |
2009年 | 89篇 |
2008年 | 79篇 |
2007年 | 63篇 |
2006年 | 59篇 |
2005年 | 54篇 |
2004年 | 39篇 |
2003年 | 38篇 |
2002年 | 40篇 |
2001年 | 27篇 |
2000年 | 16篇 |
1999年 | 21篇 |
1998年 | 49篇 |
1997年 | 24篇 |
1996年 | 31篇 |
1995年 | 27篇 |
1994年 | 24篇 |
1993年 | 14篇 |
1992年 | 13篇 |
1991年 | 8篇 |
1989年 | 12篇 |
1988年 | 13篇 |
1987年 | 12篇 |
1986年 | 13篇 |
1985年 | 11篇 |
1984年 | 10篇 |
1982年 | 13篇 |
1981年 | 8篇 |
1978年 | 9篇 |
1977年 | 10篇 |
1976年 | 20篇 |
1975年 | 8篇 |
1974年 | 10篇 |
1973年 | 9篇 |
1971年 | 9篇 |
1970年 | 8篇 |
1966年 | 15篇 |
排序方式: 共有1904条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
Daniel Ortiz Morales Simon Westerberg Pedro X. La Hera Uwe Mettin Leonid Freidovich Anton S. Shiriaev 《野外机器人技术杂志》2014,31(3):343-363
Working with forestry machines requires a great deal of training to be sufficiently skilled to operate forestry cranes. In view of this, it would be desirable within the forestry industry to introduce automated motions, such as those seen in robotic arms, to shorten the training time and make the work of the operator easier. Motivated by this fact, we have developed two experimental platforms for testing control systems and motion‐planning algorithms in real time. They correspond to a laboratory setup and a commercial version of a hydraulic manipulator used in forwarder machines. The aim of this article is to present the results of this development by providing an overview of our trajectory‐planning algorithm and motion‐control method, with a subsequent view of the experimental results. For motion control, we design feedback controllers that are able to track reference trajectories based on sensor measurements. Likewise, we provide arguments to design controllers in an open‐loop for machines that lack sensing devices. Relying on the tracking efficiency of these controllers, we design time‐efficient reference trajectories of motions that correspond to logging tasks. To demonstrate performance, we provide an overview of extensive testing done on these machines. 相似文献
75.
76.
77.
Anton A. Kiss Costin Sorin Bildea 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2012,87(7):861-879
Biodiesel is a biodegradable and renewable fuel, emerging as a viable alternative to petroleum diesel. Conventional biodiesel processes still suffer from problems associated with the use of homogeneous catalysts and the limitations imposed by the chemical reaction equilibrium, thus leading to severe economic and environmental penalties. This work provides a detailed review—illustrated with relevant examples—of novel reactive separation technologies used in biodiesel production: reactive distillation/absorption/extraction, and membrane reactors. Reactive separation offers new and exciting opportunities for manufacturing the fatty acid alkyl esters involved in the industrial production of biodiesel and specialty chemicals. The integration of reaction and separation into one operating unit overcomes equilibrium limitations and provides major benefits such as low capital investment and operating costs. These reactive separation processes can be further enhanced by heat‐integration and powered by heterogeneous catalysts, to eliminate all conventional catalyst related operations, using efficiently the raw materials and the reaction volume, while offering higher conversion and selectivity, as well as significant energy savings compared with conventional biodiesel processes. Remarkable, in spite of the high degree of integration, such integrated reactive‐separation processes are still very well controllable as illustrated by the included examples. Copyright © 2012 Society of Chemical Industry 相似文献
78.
In this paper, we study the response to external disturbances of a double integrator with a saturating feedback. For a class of disturbances that have bounded integrals over all intervals, we show that a linear static feedback law can always be designed to ensure boundedness of the states. Moreover, boundedness can be preserved if the disturbance is biased by a small DC signal. In the special case that the disturbance is made up of a finite number of sinusoids and a small bias, any linear static feedback ensures boundedness of the states. These results are an extension of previous results by Wen, Roy, and Saberi (2008). 相似文献
79.
Anton Chuvakin 《EDPACS》2013,47(4):8-12
Abstract. This article covers the importance of employing a cross-platform and cross-application log management approach rather than a siloed approach to collecting and reviewing logs for simplifying security and operational monitoring as well as compliance initiatives. 相似文献
80.
In this paper, we study control of a chain of integrators under actuator saturation and non‐additive disturbances. We shall show that boundedness of the states can be ensured if the disturbances are matched and integral‐bounded, misaligned and magnitude‐bounded, or a combination of the two, using either a static or a dynamic low‐gain state feedback. This result is an extension of our earlier work on double integrator. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献