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差分式连续时间电流型CMOS跨导—电容低通滤波器 总被引:1,自引:0,他引:1
应用信号流图法对电流系统传递函数直接模拟,提出了一种新颖的差分式连续时间电流模式CMOS跨导-电容低通滤波器的实现方案。由于采用了差分式结构和电流负反馈,整个电路方案具有差分式结构和电流型电路的优点;并且仅使用最少数量的OTA和电容,与数字CMOS工艺兼容,适于全集成。面向实际电路完成了MOS管级的计算机仿真,结果表明,所提出的电路方案正确有效 相似文献
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Robustness analysis of responses of vibration control structures with uncertain parameters using interval algorithm 总被引:1,自引:0,他引:1
Variations in system parameters due to uncertainties may result in system performance deterioration. Uncertainties in modeling of structures are often considered to ensure that control system is robust with respect to response errors. Hence, the uncertain concept plays an important role in vibration control of the engineering structures. The paper discusses the robustness of responses of vibration control systems with the uncertain parameters. The vibration control problem of an uncertain system is approximated by a deterministic one. The uncertain parameters are described by interval variables. The uncertain state matrix is constructed directly using system physical parameters and avoided to use bounds in Euclidean norm. The feedback gain matrix is determined based on the deterministic systems, and then it is applied to the actual uncertain systems. A method to calculate the upper and lower bounds of responses of the closed-loop system with uncertain parameters is presented. The upper bounds of responses can be used to estimate the robustness of responses of the controlled system with uncertain parameters. Two numerical examples are given to illustrate the applications of the present approach. 相似文献
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《Materials Characterization》2007,58(6):504-508
Mechanical alloying of powder mixtures of copper and graphite was performed in a high energy ball mill. The as-milled powder was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, respectively. These investigations indicated that high energy ball milling could largely extend the solid solubility of carbon in copper and the 4 wt.% C was dissolved in Cu. It was ascribed to the decrease of the grain size and the increase of the lattice strain. Nanostructures, amorphous carbon and lamellar graphite were observed in the as-milled powder after milling for 24 h. 相似文献
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Y.X. Li 《Materials Letters》2007,61(22):4366-4369
TiC/Al composite was successfully synthesized utilizing laser ignited self-propagating high-temperature synthesis (SHS) of Al-C-Ti system with the different C/Ti molar ratio. When the molar ratio of C to Ti is below 1:1 in the starting materials, in addition to fine TiC particulates, a large amount of Al3Ti phase was found in the composites; however, when the molar ratio of C to Ti is 1:1 in the starting materials, the Al3Ti phase was almost completely eliminated and the distribution of TiC particulates generally appeared to be more homogeneous throughout the products synthesized. 相似文献
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Stabilization problem of discrete-time linear switching systems with bounds on the state and control input is solved in this paper.First,the synthesis of state feedback controllers that ensure the stab... 相似文献
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We propose a model structure with a double-layer hidden Markov model (HMM) to recognise driving intention and predict driving behaviour. The upper-layer multi-dimensional discrete HMM (MDHMM) in the double-layer HMM represents driving intention in a combined working case, constructed according to the driving behaviours in certain single working cases in the lower-layer multi-dimensional Gaussian HMM (MGHMM). The driving behaviours are recognised by manoeuvring the signals of the driver and vehicle state information, and the recognised results are sent to the upper-layer HMM to recognise driving intentions. Also, driving behaviours in the near future are predicted using the likelihood-maximum method. A real-time driving simulator test on the combined working cases showed that the double-layer HMM can recognise driving intention and predict driving behaviour accurately and efficiently. As a result, the model provides the basis for pre-warning and intervention of danger and improving comfort performance. 相似文献
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高温钎料PdCu-Ti在氧化铝陶瓷上的润湿性及界面反应 总被引:7,自引:0,他引:7
本文采用座滴法试验研究了合金系统PdCu-Ti在Al2O3上润湿性的变化规律,探讨了界面冶金及结合等行为,运用热力学理论对结果进行了分析,随Ti含量的增加及Pd含量的减少润湿角逐渐降低,Ti的加入使界面发生了一个双重变化;液相侧富氧,钛吸收层的生成及随后的固相侧氧化钛的生成,只有界面上生成一氧化钛,才能有较好的润湿行为和较强的结合力。 相似文献