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排序方式: 共有89条查询结果,搜索用时 0 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.
本文提出了一种基于自适应低秩去噪的磁共振图像重构算法.该方法使用去噪近似消息传递算法重构磁共振图像,将自适应加权Schatten-p范数最小化方法 (Weighted Schatten p-Norm Minimization, WSNM)作为其降噪模型,研究图像的重构性能.根据算法迭代过程中估计的噪声标准差自适应的设定WSNM的图像块大小及相似块个数.实验表明,与近几年提出的磁共振图像重构算法比较,本文提出的算法可以获得更高的峰值信噪比(Peak Signal to Noise Ratio, PSNR)和更低的相对L2范数误差(Relative L2 Norm Error, RLNE),得到更好的重建效果. 相似文献
3.
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
4.
5.
Yen-Liang Chen Ming-Feng Hsu Jyh-Ting Lai An-Yeu Wu 《Journal of Signal Processing Systems》2008,52(1):59-73
Echo canceller plays an important role in the full-duplex communication system. Conventional implementations of echo cancellers
are often the adaptive transversal filter architectures due to the simplicity and robustness of stability and convergence.
However, the conventional echo cancellers suffer from high cost problem especially when the response time of the echo is long.
In this paper, a new cost-efficient architecture of echo cancellers, targeting on 10GBase-T Ethernet System, is presented.
The proposed scheme inherits the concept of channel shortening which is widely employed in DSL systems. A shortened impulse
response filter is implemented at the receiver to shorten the impulse response of the echo signal. Hence, the overall cost
of echo cancellers can be reduced. We generalize the channel shortening architecture to a joint multi-channel shortening scheme.
The joint multi-channel shortening architecture can be applied to multiple-input multiple-output wireline communication systems
to further reduce both the cost of echo and near-end crosstalk (NEXT) cancellers. We apply the proposed scheme to 10GBase-T
Ethernet system. The simulation results show that the proposed echo and NEXT cancellers can save up to 35% hardware cost compared
to the conventional transversal implementations.
相似文献
Yen-Liang ChenEmail: |
6.
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
7.
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
8.
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
9.
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
10.
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