全文获取类型
收费全文 | 328篇 |
免费 | 43篇 |
国内免费 | 102篇 |
专业分类
电工技术 | 31篇 |
综合类 | 95篇 |
化学工业 | 6篇 |
金属工艺 | 1篇 |
机械仪表 | 42篇 |
建筑科学 | 2篇 |
能源动力 | 14篇 |
武器工业 | 6篇 |
无线电 | 63篇 |
一般工业技术 | 15篇 |
冶金工业 | 3篇 |
自动化技术 | 195篇 |
出版年
2021年 | 1篇 |
2020年 | 8篇 |
2019年 | 1篇 |
2018年 | 1篇 |
2017年 | 12篇 |
2016年 | 10篇 |
2015年 | 3篇 |
2014年 | 17篇 |
2013年 | 7篇 |
2012年 | 22篇 |
2011年 | 14篇 |
2010年 | 15篇 |
2009年 | 22篇 |
2008年 | 14篇 |
2007年 | 30篇 |
2006年 | 48篇 |
2005年 | 16篇 |
2004年 | 8篇 |
2003年 | 13篇 |
2002年 | 11篇 |
2001年 | 23篇 |
2000年 | 29篇 |
1999年 | 13篇 |
1998年 | 15篇 |
1997年 | 12篇 |
1996年 | 17篇 |
1995年 | 20篇 |
1994年 | 5篇 |
1993年 | 11篇 |
1992年 | 13篇 |
1991年 | 9篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 7篇 |
1987年 | 8篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有473条查询结果,搜索用时 0 毫秒
71.
72.
基于IEEE 1500标准的IP核测试壳设计 总被引:7,自引:3,他引:4
随着集成电路规模的不断扩大,基于IP核复用的SOC设计技术被广泛应用,但是由于IP核的来源不同,设计标准的不兼容等因素,使得SOC的测试变得越来越困难。IEEE1500标准设立的目标是标准化IP核提供商与用户之间的测试接口,简化核测试信息的复用。本文在研究IEEE1500标准的硬件结构基础上,讨论了1500的测试指令集,然后以基准电路集ISCAS89中的s349时序电路为例,对其进行全扫描设计之后,详细说明了基于IEEE1500标准的IP核测试壳各部分的设计过程,最后通过仿真实验,验证了在不同测试指令和故障模式下,测试壳的有效性。 相似文献
73.
《International Journal of Hydrogen Energy》2019,44(35):19370-19383
In order to improve the robustness of the energy management system (EMS) and avoid the influence of demand power on the design of EMS, a coupled power-voltage equilibrium strategy based on droop control (CPVE-DC) is proposed in this paper. Making use of the principal that the DC bus can directly reflect the changes of load power, the proposed strategy couples DC bus voltage with output powers through droop control to achieve self-equilibrium. The proposed EMS is applied into a hybrid tramway model configured with multiple proton exchange membrane fuel cell (PEMFC) systems, batteries and super capacitors (SCs). FC systems and SC systems are responsible for satisfying most of the demand power, therefore the CPVE-DC strategy generates FCs and SCs reference power through power-voltage droop control on the primary control. Then batteries supplement the rest part of load power and generate DC bus voltage reference value of the next sampling time. With the gambling between output power and DC bus voltage, the hybrid system achieves self-equilibrium and steps into steady operation by selecting appropriate droop coefficients. Then the secondary control of the proposed strategy allocates power between every single unit. In addition, a penalty coefficient is introduced to balance SOC of SCs. The proposed strategy is tested under a real drive cycle LF-LRV on RT-LAB platform. The results demonstrate that the proposed strategy can achieve self-equilibrium and is effective to allocate demand power among these power sources,achieve active control for the range of DC bus voltage and SOC consensus of SCs as well. In addition, some faults are simulated to verify the robustness of the proposed strategy and it turns out that the CPVE-DC strategy possesses higher robustness. Finally, the CPVE-DC strategy is compared with equivalent consumption minimization strategy (ECMS) and the results shows that the proposed strategy is able to get higher average efficiency and lower equivalent fuel consumption. 相似文献
74.
Electrical resistance tomography (ERT) reconstructs the conductivity distribution from the boundary changes of electrical measurements. The inverse problem of ERT is seriously ill-posed where regularization methods are needed to treat this ill-posedness. A proper choice of regularization parameter which controls the degree of smoothing is very important for these regularization methods. Although have been a variety of methods, such as L-curve method, to choose a reasonable parameter for the problem, these methods usually result in a scalar parameter which cannot distinctly express the spatial characteristic of the conductivity distribution. So a spatially adaptive regularization parameter choice method is proposed for regularizing the inverse problem of ERT based on Tikhonov regularization. Since large regularization parameters can stabilize and smoothen the solution, while small regularization parameters can approximate and sharpen the solution, the proposed method adaptively updates the regularization parameters during the iteration process and provides spatially varying parameter for each pixel of the reconstructed image. When the iteration is stopped, large regularization parameters for the smooth background region and small regularization parameters for the object region can be obtained. The method is discussed using simulated data for some typical conductivity distributions, and further applied to the analysis of real measurement data acquiring from the practical system. The results demonstrate that flexible regularization parameter vectors can be achieved for different distributions and the strength of regularization is adaptively provided for different regions in a specific distribution. The adaptive method achieves an efficient and reliable regularization solution and has outstanding performance in noise immunity especially in smooth background regions. 相似文献
75.
微惯性测量器件的标定方法研究 总被引:1,自引:0,他引:1
在捷联惯性航向姿态测量系统中,微惯性器件是核心部分,陀螺和加速度计的精度直接影响整个系统的精度.详细给出了惯性测量器件的标定方法,利用软件来补偿器件的误差,从而改善系统性能. 相似文献
76.
首先介绍了数据挖掘的过程,然后提出使用VB以及ADO开发数据挖掘应用的一般方法,并通过一个实际应用问题, 展示了方法的具体实现.这种方法便于使用,是实现数据挖掘的良好工具. 相似文献
77.
分析了直流电机伺服系统中的不确定性,建立了直流电机伺服系统的不确定性模型,探讨了户综合控制算法在直流电机跟踪系统中的应用,并使用D-K递推方法进行了计算,给出了最后设计结果。使用Mtalab进行仿真实验比较,证明这种控制算法能够很好地满足系统需要的控制要求,且具有较强的鲁棒性。 相似文献
78.
Human–robot interaction (HRI) has become a research hotspot in computer vision and robotics due to its wide application in human–computer interaction (HCI) domain. Based on the explored algorithms of gesture recognition and limb movement recognition in somatosensory interaction, an HRI model of a robotic arm is proposed for robot arm manipulation. More specifically, 3D SSD architecture is used for the location and identification of gesture and arm movement. Then, DTW template matching algorithm is adopted to trace the dynamic gestures. The interactive scenarios and interactive modes are designed for experiment and implementation. Virtual interactive experimental results have demonstrated the usefulness of our method. 相似文献
79.
80.