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Application of enhanced coagulation aided by UF membrane for car wash wastewater treatment

Application of enhanced coagulation aided by UF membrane for...

The 2nd International Conference on Bioinformatics and Biomedical engineering(iCBBE 2008)(第二届生物信息与生物医学工程国际会议)

作者： Xuejun Tan Li Tang Research & Development Center Shanghai Municipal Engineering Design General Institute Shanghai Chin State Key Lab. of Pollution Control & Resource Reuse Tongji University 1239 Siping Road Shanghai C

The effect and the application ways of nhanced coagulation using KMnO4 were tested in this article. It was demonstrated that the addition of KMnO4 to coagulant (PAC) could enhance the efficiency of coagulation, which helped for reducing clogging of ultrafiltration membrane. KMnO4 is suitable to be used before PAC addition for avoiding large flocculating constituent conforming, which reduces contacting area of KMnO4 and organic matters. Furthermore, it's would not oxidize the conformed flocculating constituent and destroy the flocculating. The existence of organic matter could influence the effect of enhanced coagulation on wastewater treatment. Mechanisms that the good effect of enhanced coagulation were analyzed. Four kinds of membrane resistance were tested, which illustrated that the adsorption resistance was the main factor for membrane blocking. Adsorption resistance normally was caused by organic matters. Existence of KMnO4 would reduce the influence of organic matter on coagulation and two reasons were analyzed. By treating in this way, treated water could be reused for car washing.

关键词： enhanced coagulation ultrafiltration carwash wastewater reuse

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Gaussian particle filter based pose and motion estimation

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2007年第10期8卷 1604-1613页

作者： WU Xue-dong SONG Zhi-huan State Key Lab. of Industrial Control Technology Institute of Industrial Process Control Zhejiang University Hangzhou 310027 China Department of Electronic Information and Electrical Engineering Fujian University of Technology Fuzhou 350014 China

Determination of relative three-dimensional （3D） position, orientation, and relative motion between two reference frames is an important problem in robotic guidance, manipulation, and assembly as well as in other fields such as photogrammetry. A solution to pose and motion estimation problem that uses two-dimensional （2D） intensity images from a single camera is desirable for real-time applications. The difficulty in performing this measurement is that the process of projecting 3D object features to 2D images is a nonlinear transformation. In this paper, the 3D transformation is modeled as a nonlinear stochastic system with the state estimation providing six degrees-of-freedom motion and position values, using line features in image plane as measuring inputs and dual quaternion to represent both rotation and translation in a unified notation. A filtering method called the Gaussian particle filter （GPF） based on the panicle filtering concept is presented for 3D pose and motion estimation of a moving target from monocular image sequences. The method has been implemented with simulated data, and simulation results are provided along with comparisons to the extended Kalman filter （EKF） and the unscented Kalman filter （UKF） to show the relative advantages of the GPF. Simulation results showed that GPF is a superior alternative to EKF and UKF.

关键词： Gaussian particle filter （GPF） Pose and motion estimation Line features Monocular vision Extended Kalman filter（EKF） Unscented Kalman filter （UKF） Dual quatemion

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Application of PLSR to the voidage measurement of gas-oil two-phase flow

Application of PLSR to the voidage measurement of gas-oil tw...

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2007 8th International Conference on Electronic Measurement and Instruments, ICEMI

作者： Xia, Li Baoliang, Wang Zhiyao, Huang Haiqing, Li State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)1424411351

Based on ECT technique and Partial Least Squares Regression (PLSR), a new voidage measurement method for gas-oil two-phase flow was proposed. PLSR was utilized to develop the voidage measurement models for given flow patterns. In practical voidage measurement process, according to the flow pattern identification result, a related PLSR based model was selected to calculate the measurement voidage. Experimental results show that the proposed method is effective and the accuracy of the voidage measurement is satisfactory. The maximum measurement error is less than 5%. Research results also verify the good real-time performance of the proposed voidage measurement method. Because it implements the voidage measurement without the time-consuming image reconstruction process, the total voidage measurement time is less than 0.1s. © 2007 IEEE.

关键词： Flow patterns

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H∞ analysis method for the small signal stability of power system

H∞ analysis method for the small signal stability of power ...

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26th Chinese control Conference, CCC 2007

作者： Mei, Shengwei Che, Wenyan State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Beijing 100084 China

ISBN: (纸本)7900719229

This work is concerned with the small signal stability problem in multi-machine systems. By means of H∞ theory, firstly the math model with disturbances is constructed;and secondly, the excitation control law for each generator is designed based on solving Riccati Equation. Finally, simulations performed on 4-machine system shows that the proposed H ∞ method has more advantages over LQR method in both damping ratio and H∞ norm of the corresponding closed-loop system and so can enhance the small signal stability of power system greatly.

关键词： Electric power systems

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Multiscale gap statistic for edge detection based on evidence theory

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2007年第8期18卷 988-991页

作者： Zhang, Hao Cai, Jin-Hui Zhou, Ze-Kui State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

To solve the conflict between image denoising and edge localization, a novel edge detection algorithm based on multiscale gap statistic information fusion through DS evidence theory was proposed. Gap statistic of gray-scale image was defined. Detection uncertainty was introduced in fusion procession. Mass functions (or basic probability assignment functions) were designed based on the relationship between Gap statistic response and detection threshold. Detection uncertainty reaches maximum value at the detection threshold. And mass functions corresponding to each Gap statistic at different scales were combined by Dempster's combination rule. Pixels were classified into edge or off-edge according to the joint mass function. Tex experimental results show that this proposed method is effective in reducing detection uncertainty and better than classical edge detectors.

关键词： Edge detection

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Pb(Mg1/3Nb2/3)O3- PbNi 1/3Nb2/3O3-PbTiO3 crystals by solid state growth

Pb(Mg1/3Nb2/3)O3- PbNi 1/3Nb2/3O3-PbTiO3 crystals by solid s...

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作者： Chen, Kepi Pan, Jinsong Zhang, Xiaowen Department of Power Engineering Key Lab. of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education North China Electric Power University Beijing 102206 China State Key Lab. of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

A small piece of 〈110〉 orientated relaxor-based ferroelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) single crystals was embedded in Pb(Mg1/3Nb2/3)O 3-Pb(Ni1/3Nb2/3)O3-PbTiO 3 (PMN-PNN-PT) polycrystalline matrix to form the fully dense disk by spark plasma sintering (SPS) technique. Specimens were subsequently annealed to promote the boundary migration of the template single-crystal through a process termed as solid-state single crystal growth. It was found that the addition of excess 5 wt% PbO can promote the crystal growth, and the 2D morphology with V-shaped single crystals of PMN-PNN-PT were also observed. The possible growth mechanism was discussed.

关键词： Single crystals

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Influence of relative humidity on TiO2/ACF photocatalytic oxidation of toluene: PCO rate and intermediates accumulation

Influence of relative humidity on TiO2/ACF photocatalytic ox...

引用

6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007

作者： Guo, Ting Bai, Zhipeng Wu, Can Zhu, Tan State Environ. Protect. Key Lab. of Urban Ambient Air Particulate Matter Pollution Prev. and Control College of Environmental Science and Engineering Nankai University Tianjin China

ISBN: (纸本)9784861630705

Photocatalytic oxidation (PCO) tests have been carried out for toluene adsorbed on the TiO2/ACF catalyst in an environmental condition controlled chamber. TiO2/ACF catalyst was made and characterized by N2 adsorption isotherm for pore structure and scanning electron microscopy (SEM) for morphology respectively. Through exploring the remnant of toluene and the accumulation of intermediates on the TiO2/ACF catalyst including species, amount and their change processes under different relative humidity (RH), this study aimed to explore the influence of RH on the PCO of toluene and the role of water vapor in the PCO process: PCO reaction paths and the accumulation of intermediates on the TiO2/ACF catalyst. Results suggested that: (1) RH affects both the PCO rate and the PCO reaction path of toluene;(2) although methyl group oxidation is the major path, aromatic ring oxidation, which is not the expected path for the PCO of toluene, is enhanced when the RH increases;(3) apart from the role of hydroxyl radical (OH) arose from water by TiO2, water molecular also directly takes part in the PCO process. A hypothesis has been proposed.

关键词： Titanium dioxide

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Breakdown phenomena caused by electrical tree degradation in high density polyethylene under high frequency voltage

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Gaodianya Jishu/High Voltage engineering 2007年第12期33卷 14-18页

作者： Zhou, Yuan-Xiang Xing, Xiao-Liang Nie, Qiong Wang, Yun-Shan Wang, Ning-Hua Liang, Xi-Dong Guan, Zhi-Cheng State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China

The shape change of electrical tree propagating in ice-water quenched high-density polyethylene (HDPE) film under AC voltage of different frequency ranging from 50 Hz to 90 kHz as well as the breakdown phenomena caused by the treeing degradation under high frequency condition were studied. The electrical treeing aging experiment is carried out at room temperature. The shape change of electrical tree and the arcing process during the experiment is observed via a digital micro-observing system. It is found that the arcing process can be obviously observed under a high frequency voltage compared with that under low frequency voltage. It is also found that under different frequency voltages the electrical tree initiation shape is different. Most of the electrical trees are branch-shape tree under lower frequency voltage. When the frequency is higher than 5 kHz, trunk-shape tree and bosk-like tree appears. Once the frequency is higher than 50 kHz, breakdown tree can be found out. It is shown that the tree shape conversion is influenced by the frequency. The electrical tree usually has a simple shape and rarely changes under low frequency voltage in one hour or more. However, under a high frequency voltage, the electrical tree shape changes more frequently and has a large probability to breakdown. The influence of frequency on material polarization process, fatigue and thermo effect is considered as the main causes of the experiment results. The more serious destruction caused by high frequency electrical treeing degradation can well explain the reason of insulation premature inactivation in mid-frequency or high-frequency electrical equipment.

关键词：聚乙烯树老化电树形态转换击穿频率

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Profile comparison of coal combustion fly ash between two different sampling methods

Profile comparison of coal combustion fly ash between two di...

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Symposium on Air Quality Measurement Methods and Technology 2007

作者： Zhipeng, Bai Guanghuan, Guo Bin, Han State Environ. Protect. Key Lab. of Urban Ambient Air Particulate Matter Poll. Prev. and Control College of Environmental Science and Engineering Nankai University Tianjin 300071 China

No abstract availab.e

ISBN: (纸本)9781604239003

No abstract availab.e

关键词：

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Spectral clustering based null space linear discriminant analysis (SNLDA)

Spectral clustering based null space linear discriminant ana...

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11th Pacific-Asia Conference on Knowledge Discovery and Data Mining, PAKDD 2007

作者： Wenxin, Yang Junping, Zhang Department of Electronic Engineering Fudan University Shanghai 200433 China Shanghai Key Lab. of Intelligent Information Processing Department of Computer Science and Engineering Fudan University Shanghai 200433 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University China

ISBN: (纸本)9783540717003

While null space based linear discriminant analysis (NLDA) obtains a good discriminant performance, the ability easily suffers from an implicit assumption of Gaussian model with same covariance each class. Meanwhile, mixture model discriminant analysis, which is a good way for processing issues on multiple subclasses in each class, depends on human experience on the number of subclasses and has a highly complex iterative process. Considering the cons and pros of the two mentioned approaches, we therefore propose a new algorithm, called Spectral clustering based Null space Linear Discriminant Analysis (SNLDA). The main contributions of the algorithm include the following three aspects: 1) Employing a new spectral clustering method which can automatically detect the number of clusters in each class. 2) Finding a unified null space for processing multi-subclasses issues with eigen-solution technique. 3) Refining the calculation of the covariance matrix in a single sample subclass. The experimental results show the promising of the proposed SNLDA algorithm. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Clustering algorithms

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