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排序方式: 共有89条查询结果,搜索用时 31 毫秒
1.
Ming-Feng HsiehJunmin Wang 《Control Engineering Practice》2011,19(4):346-353
This paper presents an extended Kalman filter (EKF) based approach of integrating NOx and NH3 sensors to estimate the NOx concentrations in Diesel engine selective catalytic reduction (SCR) aftertreatment systems. NOx sensors have been commonly used by vehicles for aftertreatment system control and onboard diagnostics (OBD) purposes. However, most currently available NOx sensors are cross-sensitive to ammonia. Based on the experimental observations and physical inferences, the cross-sensitivity characteristics may change with temperature and is hard to be predicted by a model. This feature limits the applications of NOx sensors on urea-SCR systems where ammonia is the reductant for NOx conversions. Grounded in the insight into SCR dynamics and NOx sensor properties, a novel approach of using an extended Kalman filter to estimate the actual exhaust gas NOx concentration was proposed. The estimator was examined by NOx measurements from a Horiba gas analyzer under different engine operating conditions. The experimental results show that the EKF-based approach can significantly improve the accuracy of NOx concentration measurements from the original NOx sensor readings. 相似文献
2.
Ming-Feng Lu Hong-Fang Ji Ting-Xuan Li Shou-Kai Kang Yue-Jie Zhang Jue-Fei Zheng Tian Tian Xi-Shuai Jia Xing-Ming Lin Hong-Yu Zhang 《International journal of molecular sciences》2013,14(6):12843-12852
Primitive proteins are proposed to have utilized organic cofactors more frequently than transition metals in redox reactions. Thus, an experimental validation on whether a protein constituted solely by early amino acids and an organic cofactor can perform electron transfer activity is an urgent challenge. In this paper, by substituting “late amino acids (C, F, M, T, W, and Y)” with “early amino acids (A, L, and V)” in a flavodoxin, we constructed a flavodoxin mutant and evaluated its characteristic properties. The major results showed that: (1) The flavodoxin mutant has structural characteristics similar to wild-type protein; (2) Although the semiquinone and hydroquinone flavodoxin mutants possess lower stability than the corresponding form of wild-type flavodoxin, the redox potential of double electron reduction Em,7 (fld) reached −360 mV, indicating that the flavodoxin mutant constituted solely by early amino acids can exert effective electron transfer activity. 相似文献
3.
This paper attempts to propose a single-input cerebellar model articulation controller (CMAC) control system, which contains only one controller implemented by the CMAC. The single-input CMAC control system adopts two learning stages. An off-line learning stage is to enable the output behavior of the CMAC to approximate the control surface of a fuzzy PD-type controller. An on-line learning stage follows to improve the system stability by the modified learning rule. The linear interpolation scheme is also applied to the recall process at the on-line learning stage to ensure better accuracy of the CMAC output. Simulation results show that the single-input CMAC controller is superior to the fuzzy PD-type controller. 相似文献
4.
A dynamic model for a fed-batch fermentation of Ralstonia eutropha for PHB production is presented. Based on the simplified kinetics, some of kinetic parameters are very sensitive to uncertainties. To develop the robust and feasible feeding strategy, the specific optimal adaptive control strategy is determined by solving the constrained discrete-time optimization algorithm using the genetic algorithm solver in Matlab. The proposed control methods are implemented to the feed flow manipulation with stepwise changes. Through Lyapunov stability analysis, the closed-loop stability regarding the state estimation errors and parametric uncertainties is investigated. Finally, simulations show that the satisfactory output tracking performance is achieved under the two-input control configuration. 相似文献
5.
In practice, water pricing is the main economic instrument used to discourage the wasteful use of residential water. Owing to considerations of affordability, residential water is systematically underpriced because water is essential for life. Such a low price results in water being used inefficiently. This paper proposes a system that supplements the existing price system with a cap-and-trade measure to reconcile conflicts among the goals of residential water use. It forces all people (independent of income) to be faced with reasonable price signals and to use water efficiently. The poor could, however, gain from trade and afford water. By taking advantage of the agent-based model, a simulation of this system applied to Taipei, Taiwan shows that those with lower income per capita are better off under this system even though the equilibrium price of residential water is higher. The simulated average price elasticity of market demand is ?0.449. 相似文献
6.
Yi-Jen Fang Chih-Hsien Chiu Yuan-Yen Chang Chung-Hsi Chou Hui-Wen Lin Ming-Feng Chen Yi-Chen Chen 《Food research international (Ottawa, Ont.)》2011,44(9):3105-3110
Chronic alcohol consumption or alcohol abuse is the main cause of alcoholic steatohepatitis or further cirrhosis. This study was to exam if the antioxidant capacity and alcohol metabolism in livers of chronic alcohol-fed rats were improved by supplementing taurine (Tau). Rats were randomly divided into four groups with five times per week of treatment: 1) isocaloric solution; 2) 3 g alcohol/kg BW/day; 3) 3 g alcohol/kg BW/day + 1 g taurine (Tau)/kg BW/day; and 4) 3 g alcohol/kg BW/day + 2 g Tau/kg BW/day. A 6-week alcohol consumption resulted in lower (p < 0.05) body weight gain and self-antioxidant capacities, as well as increased (p < 0.05) liver size, serum/hepatic lipids, and AST and ALT values. However, alcohol-fed rats co-treated with Tau have decreased (p < 0.05) liver lipid levels via increasing fecal lipid output and cholesterol metabolism. Besides, co-treatment of Tau also enhanced (p < 0.05) self-antioxidant capacities and alcohol metabolism in livers via enhancing GSH contents, CAT, GSH-Px, ADH, and ALDH activities, but decreasing MDA contents. In a histological examination of rat liver, microvesicular steatosis and necrotic cells were observed in alcohol-fed rats without Tau while largely suppressed microvesicular steatosis and no necrotic cells were observed in alcohol-fed rat supplemented with Tau. Therefore, Tau could be an effective hepatoprotective agent against alcohol-induced damage via enhancing self-antioxidant capacity and alcohol metabolism. 相似文献
7.
Microsystem Technologies - The fuzzy ant colony optimization (FACO) method proposed in this paper minimizes the iterative learning error of the ant colony optimization (ACO) algorithm using fuzzy... 相似文献
8.
湖南工业大学工业设计专业在2009年成为湖南省特色专业,在快速发展的九年时间里,紧抓长株潭两型社会建设的发展机遇,着眼于区域产业资源,打造专业建设的切入点。依托机械学科的学科优势,有效促进学科交叉的有机融合,在师资队伍建设、课程建设、人才培养建设等方面走出品牌专业建设之路。 相似文献
9.
Xuan-Lun Huang Jiun-Lang Huang Hung-I Chen Chang-Yu Chen Tseng Kuo-Tsai Ming-Feng Huang Yung-Fa Chou Ding-Ming Kwai 《Journal of Electronic Testing》2012,28(5):705-722
This paper presents a self-testing and calibration technique for the embedded successive approximation register (SAR) analog-to-digital converter (ADC) in system-on-chip (SoC) designs. We first proposed a low cost design-for-test (DfT) technique that estimates the SAR ADC performance before and after calibration by characterizing its digital-to-analog converter (DAC) capacitor weights (bit weights). Utilizing major carrier transition (MCT) testing, the required analog measurement range is only about 1 LSB; this significantly reduces test circuitry complexity. Then, we develop a fully-digital calibration technique that utilizes the extracted bit weights to correct the non-ideal I/O behavior induced by capacitor mismatch. Simulation results show that (1) the proposed testing technique achieves very high test accuracy even in the presence of large noise, and (2) the proposed calibration technique effectively improves both static and dynamic performances of the SAR ADC. 相似文献
10.
Hsien-Tang Chiu Ming-Feng Cheng Heng-Yu Liu 《Polymer-Plastics Technology and Engineering》2013,52(3):199-205
This study aims to understand the different photocuring behaviors of acrylated polyester by adding different photoinitiators and monomers. Differential photo calorimeter (DPC) is used to understand the exothermal effects during photocuring. The self-catalyst model of dynamic analysis software was then used to obtain the relationships between reaction speed, reaction extent, and rate of reaction. In addition, this study also tried to understand the formation of photocuring resin from the rigid-body pendulum rheometer (RPT) experiment. The results showed that the extent of reaction, conversion rate and speed varies directly with the concentration of the photoinitiator and monomer. The reaction level of propoxylated pentaerithritol triacrylate was higher than propoxylated neopentyl-glycol diacrylate. Moreover, the method using RPT shows better view of the molecule reaction status inside the photopolymer. 相似文献