全文获取类型
收费全文 | 2958篇 |
免费 | 320篇 |
国内免费 | 221篇 |
专业分类
电工技术 | 148篇 |
综合类 | 304篇 |
化学工业 | 141篇 |
金属工艺 | 71篇 |
机械仪表 | 137篇 |
建筑科学 | 438篇 |
矿业工程 | 106篇 |
能源动力 | 107篇 |
轻工业 | 62篇 |
水利工程 | 155篇 |
石油天然气 | 130篇 |
武器工业 | 33篇 |
无线电 | 163篇 |
一般工业技术 | 401篇 |
冶金工业 | 176篇 |
原子能技术 | 47篇 |
自动化技术 | 880篇 |
出版年
2024年 | 6篇 |
2023年 | 18篇 |
2022年 | 38篇 |
2021年 | 57篇 |
2020年 | 102篇 |
2019年 | 90篇 |
2018年 | 49篇 |
2017年 | 87篇 |
2016年 | 102篇 |
2015年 | 113篇 |
2014年 | 159篇 |
2013年 | 230篇 |
2012年 | 187篇 |
2011年 | 228篇 |
2010年 | 152篇 |
2009年 | 225篇 |
2008年 | 197篇 |
2007年 | 194篇 |
2006年 | 179篇 |
2005年 | 142篇 |
2004年 | 146篇 |
2003年 | 111篇 |
2002年 | 101篇 |
2001年 | 100篇 |
2000年 | 72篇 |
1999年 | 64篇 |
1998年 | 28篇 |
1997年 | 45篇 |
1996年 | 49篇 |
1995年 | 32篇 |
1994年 | 36篇 |
1993年 | 28篇 |
1992年 | 18篇 |
1991年 | 23篇 |
1990年 | 11篇 |
1989年 | 9篇 |
1988年 | 11篇 |
1987年 | 5篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 3篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1965年 | 2篇 |
1957年 | 2篇 |
1956年 | 3篇 |
1954年 | 1篇 |
排序方式: 共有3499条查询结果,搜索用时 17 毫秒
71.
This paper investigates the problem of the absolute stability of Lur'e systems with a time‐varying delay. By considering the relationships among the time‐varying delay, its upper bound, and the difference between them, less conservative delay‐dependent stability criteria are obtained and formulated in terms of linear matrix inequalities, without ignoring any useful terms in the derivative of a Lyapunov–Krasovskii functional. Numerical example shows that the results obtained in this paper are better than the previous results. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
72.
针对ARPS算法中初始预测运动矢量不够精确并且ARPS算法针对不同宏块采用相同搜索策略的问题,在深入研究ARPS算法原理的基础上,提出一种基于自适应扁平搜索模板的新的快速运动估计算法.本文在算法的初始预测运动矢量、算法提前终止准则等方面提出了新的观点和方法,同时针对物体的不同运动趋势采用不同的搜索模板.实验证明,本文提出的改进算法在不影响图像编码效率的前提下较大地降低了计算复杂度. 相似文献
73.
74.
75.
76.
A. Kaklauskas E.K. ZavadskasM. Seniut G. DzemydaV. Stankevic C. Simkevi?iusT. Stankevic R. PaliskieneA. Matuliauskaite S. KildieneL. Bartkiene S. IvanikovasV. Gribniak 《Engineering Applications of Artificial Intelligence》2011,24(6):928-945
This article describes the analysis of emotional state and work productivity using a Web-based Biometric Computer Mouse Advisory System to Analyze a User's Emotions and Work Productivity (Advisory system hereafter) developed by this paper's authors. The Advisory system determines the level of emotional state and work productivity integrally by employing three main biometric techniques (physiological, psychological and behavioral). By using these three biometric techniques, the Advisory system can analyze a person's eleven states of being (stress, work productivity, mood, interest in work) and seven emotions (self-control, happiness, anger, fear, sadness, surprise and anxiety) during a realistic timeframe. Furthermore, to raise the reliability of the Advisory system even more, it also integrated the data supplied by the Biometric Finger (blood pressure and pulse rates). Worldwide research includes various scientists who conducted in-depth studies on the different and very important areas of biometric mouse systems. However, biometric mouse systems cannot generate recommendations. The Advisory system determines a user's physiological, psychological and behavioral/movement parameters based on that user's real-time needs and existing situation. It then generates thousands of alternative stress management recommendations based on the compiled Maslow's Pyramid Tables and selects out the most rational of these for the user's specific situation. The information compiled for Maslow's Pyramid Tables consists of a collection of respondent surveys and analyses of the best global practices. Maslow's Pyramid Tables were developed for an employee working with a computer in a typical organization. The Advisory system provides a user with a real-time assessment of his/her own productivity and emotional state. This article presents the Advisory system, a case study and a scenario used to test and validate the developed Advisory system and its composite parts to demonstrate its validity, efficiency and usefulness. 相似文献
77.
78.
Due to time spent in computation and transfer, control input is usually subject to delays. Problems of deterministic systems with input delay have received considerable attention. However, relatively few works are concerned with problems of stochastic system with input delay. This paper studies delayed-feedback stabilization of uncertain stochastic systems. Based on a new delay-dependent stability criterion established in this paper, a robust delayed-state-feedback controller that exponentially stabilizes the uncertain stochastic systems is proposed. Numerical examples are given to verify the effectiveness and less conservativeness of the proposed method. 相似文献
79.
区间直觉模糊信息下的双向投影决策模型 总被引:2,自引:0,他引:2
研究权重完全未知、评价信息为区间直觉模糊数的多准则决策问题. 考虑犹豫度影响, 给出备选方案与正理想方案、负理想方案形成的向量表达方式, 提出一种针对区间直觉模糊信息的向量投影测度方法; 构建基于方案投影总偏差最小的非线性规划准则权重确定模型; 给出基于方案投影的相对贴近度测算公式, 并以此对方案进行排序. 最后通过算例对比分析表明了所提出方法的有效性和可行性.
相似文献80.
Yi-Chung Hu 《控制论与系统》2016,47(3):220-235
This article proposes a flow-based method using the single criterion net flow for pattern classification. Traditional single criterion net flow, generated on the basis of net partial concordance indices, measures the preference intensity for one pattern with respect to all others on this criterion. A concordance index measures the intensity of preference for one pattern over another pattern. Contrary to traditional flow-based methods, such as PROMETHEE, in which only the concordance relation is taken into account, the proposed method proposes a new definition of single criterion net flow using both concordance and discordance relations. This can balance pros and cons for the preference of one pattern over another pattern for a criterion. The final classification decision for a new pattern depends on its net flow. Criteria weights are determined using a genetic-algorithm-based approach. Empirical results involving bankruptcy prediction demonstrate that the proposed method performs well compared to other well-known classification methods. 相似文献