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MnCeOx/diatomite catalyst for persulfate activation to degrade organic pollutants

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Journal of Environmental Sciences 2020年第3期32卷 206-217页

作者： Lijun Niu guang Xian Zeqing long guangming Zhang Ningyu Zhou School of Environment and Natural Resource Renmin University of ChinaBeijing 100872China Department of Military Installations Army Lorange Gistics University of PLAChongqing 401311China

Persulfate(PS)-based oxidation technologies are attracting increasing attentions in water treatment due to their high efficiency and *** this study,a novel diatomite supported MnCeOx composite(MnCeOx/diatomite) was prepared and characterized for activation of PS to degrade organic *** indicated that diatomite not only dispersed MnCeOx and increased the specific surface area of catalyst,but also improved the low-valence metal site(Mn^2+and Ce^3+) and reactive oxygen species site(-OH) of MnCeOx,thus enhancing the activities of ***/diatomite/PS showed high efficiency for multiple dyes and pharmaceutical *** rate(k) of MnCeOx/diatomite(kMnCeOx/diatomite) was three times higher than the sum of constant rate of MnCeOx(kMnCeOx)and constant rate of diatomite(kdiatomite).In addition,MnCeOx/diatomite showed wide pH application(5-9).Cl^- and NO3^2- had no effect while SO4^2- and humid acid had slightly negative effects on MnCeOx/diatomite/PS ***,MnCeOx/diatomite showed good reusability and *** analyses indicated that electron transfer of Mn and Ce attributed to the activation of PS and oxygen to produce free ***4·^-,·OH and O2·^-on the surface of catalyst were the main active free radicals to attack pollutants.

关键词： MnCeOx/diatomite Persulfate Dyes and pharmaceutical pollutants Hydroxyl functional group

Experimental study on gas permeability by adsorption under 3D-stress

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Journal of Coal Science & Engineering(China) 2009年第2期15卷 148-151页

作者： long Qing-ming WEN guang-cai zou Yin-hui ZHAO Xu-sheng Chongqing Research Institute China Coal Research Institute Chongqing 400037 China

Using self-developed gas-seepage experimental installation,under the sameeffective stress conditions,coal permeability experiments on different adsorption characteristicsof gases,different temperatures and different gas adsorption contents were performed,and the influence law of adsorption on coal permeability was *** the sametime,experimental analogy showed clearly that gas drawing plucks the permeability *** results show that adsorption has a major impact on coal *** the adsorption,the more the gas adsorption capacity and the coal permeabilitybecomes *** becomes smaller along with confining of pressure andtemperature,and this is in accord with local practice results.

关键词： gas adsorption permeability pressure temperature

Changes of tropical cyclone tracks in the western North Pacific over19792016

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Advances in Climate Change Research 2018年第3期9卷 170-176页

作者： ZHANG Wen-Qian WU Li-guang zou Xu-Kai Pacific Typhoon Research Center Nanjing University of Information Science & Technology Nanjing 210044 China Key Laboratory for Climate Studies National Climate Center China Meteorological Administration Beijing 100081 China

The tropical cyclone （TC） trajectory model has been widely used to investigate the mechanism of the climate change of TC tracks. In thisstudy, the Gaussian weight interpolation method is used to calculate the beta drift in the TC track or trajectory model. By simulating historicalTC tracks, the new calculation can better simulate the spatial distribution of the frequency of TC occurrence. The improved track model isfurther used to understand the TC track change during the period of 1979e2016. In 1979e2016, the TC activity has been suppressed in theSouth China Sea （SCS） while the TC influence along the southeast coastal regions of China has been increased. The sensitivity experimentsindicate that the change of the formation location plays a dominant role in decreasing TC influence in the SCS while the change of theenvironmental steering flows increases the TC influence in the eastern coastal region of China. This study suggests that the ongoing climatechange can affect the TC activity along the coast of China.

关键词： Tropical cyclone Trajectory model Beta drift Formation position Large-scale steering flows

Estimating the resistance of aging service-proven bridges with a Gamma process-based deterioration model

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第1期6卷 76-84页

作者： Cao Wang Kairui Feng long Zhang Aming zou School of Civil Engineering The University of Sydney Department of Civil Engineering Tsinghua University CCCC Highway Consultants CO. Ltd.

The environmental or anthropogenic factors, to which the in-service bridges are subjected,are responsible for the reduction of bridge performance, and finally lead to great service risk for bridges and increase the probability of substantial economic losses. Probabilitybased estimate of bridge resistance is an essential indicator for the bridge condition evaluation and for optimization of bridge maintenance/repair decisions. It places an emphasis on the proper probabilistic models of structural properties and assessment methods. Making full use of historical service load information may improve the accuracy of bridge performance assessment with reduced epistemic uncertainty for existing aging bridges. In to-date analyses to update the bridge resistance with past service information,the models of resistance deterioration have been assumed as either deterministic or fully correlated, which may differ significantly from the realistic case. With this regard, this paper proposes a novel method for updating the resistance of service-proven bridges with a realistic deterioration model. The Gamma stochastic process has been suggested in the literature to describe the probabilistic behavior of structural time-dependent resistance and thus is adopted in this paper. An illustrative bridge is presented to demonstrate the applicability of the proposed method. Parametric examples are conducted to investigate the role of resistance deterioration model in the updated estimate of bridge resistance with historical service information.

关键词： Existing aging bridges Historical load information Resistance updating Gamma deterioration process Bridge safety

Numerical estimation of choice of the regularization parameter for NMR T2 inversion

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Petroleum Science 2016年第2期13卷 237-246页

作者： You-long zou Ran-Hong Xie Alon Arad State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing 102249China Shell International Exploration and Production Inc. Houston 77079 TX USA

Nuclear Magnetic inversion is the basis of NMR Resonance （NMR） T2 logging interpretation. The regularization parameter selection of the penalty term directly influences the NMR T2 inversion result. We implemented both norm smoothing and curvature smoothing methods for NMR T2 inversion, and compared the inversion results with respect to the optimal regular- ization parameters （（Xopt） which were selected by the dis- crepancy principle （DP）, generalized cross-validation （GCV）, S-curve, L-curve, and the slope of L-curve methods, respectively. The numerical results indicate that the DP method can lead to an oscillating or oversmoothed solution which is caused by an inaccurately estimated noise level. The （Xopt selected by the L-curve method is occa- sionally small or large which causes an undersmoothed or oversmoothed T2 distribution. The inversion results from GCV, S-curve and the slope of L-curve methods show satisfying inversion results. The slope of the L-curve method with less computation is more suitable for NMR T2 inversion. The inverted T2 distribution from norm smoothing is better than that from curvature smoothing when the noise level is high.

关键词： NMR T2 inversion Tikhonov regularizationVariable substitution Levenberg-Marquardt method Regularization parameter selection

Domain Decomposition Method for a System of Quasivariational Inequalities

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Acta Mathematicae Applicatae Sinica 2009年第1期25卷 75-82页

作者： Shu-zi Zhou Zhan-yong zou guang-hua Chen Department of Applied Mathematics Hunan University Changsha 410082 China School of Mathematics & Computational Science Guangdong University of Business Studies Guangzhou510320 China

We propose a domain decomposition method for a system of quasivariational inequalities related to the HJB equation. The monotone convergence of the algorithm is also established.

关键词： Domain decomposition method system of quasivariational inequalities HJB equation monotoneconvergence

A Novel Method for Prediction of Protein Domain Using Distance-Based Maximal Entropy

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Journal of Bionic Engineering 2008年第3期5卷 215-223页

作者： Shu-xue zou Yan-xin Huang Yan Wang Chun-guang Zhou Key Laboratory of Symbol Computation and Knowledge Engineering of Ministry of Education College of Computer Science and Technology Jilin University Changchun 130012 P. R. China

Detecting the boundaries of protein domains is an important and challenging task in both experimental and computational structural biology. In this paper, a promising method for detecting the domain structure of a protein from sequence information alone is presented. The method is based on analyzing multiple sequence alignments derived from a database search. Multiple measures are defined to quantify the domain information content of each position along the sequence. Then they are combined into a single predictor using support vector machine. What is more important, the domain detection is first taken as an imbal- anced data learning problem. A novel undersampling method is proposed on distance-based maximal entropy in the feature space of Support Vector Machine （SVM）. The overall precision is about 80%. Simulation results demonstrate that the method can help not only in predicting the complete 3D structure of a protein but also in the machine learning system on general im- balanced datasets.

关键词： protein domain boundary SVM imbalanced data learning distance-based maximal entropy

Numerical analysis of dislocations of the face slabs of the Zipingpu Concrete Faced Rockfill Dam during the Wenchuan earthquake

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Earthquake Engineering and Engineering Vibration 2011年第4期10卷 581-589页

作者： Kong Xianjing Zhou Yang zou Degao Xu Bin Yu long The State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China Institute of Earthquake Engineering School of Hydraulic Engineering Dalian University of Technology Dalian 116024 China

The Zipingpu Concrete Faced Rockfill Dam （CFRD） was obviously damaged during the Wenchuan earthquake in 2008. A wide range of dislocations occurred along the horizontal construction joints at EL. 845m, between the face slabs constructed in the second and third stages. The maximum displacement of the dislocations reached 17cm. In this study, the slab dislocations were investigated using finite element （FE） analysis. The method based on strain potential was applied to compute the permanent deformation of the Zipingpu Dam during the Wenchuan earthquake. The calculated magnitude of the slab dislocation showed good agreements with the field measurements. The dislocation mechanism was discussed. The results show that the dislocation of the concrete slab is a subsequent damage after the permanent deformation of the rockfill materials. The effects of the shear strength and the direction of the construction joints, the reservoir water level and the seismic waves were studied. The shear strength and the direction of the construction joints, reservoir water level and have a significant effect on the dislocation displacement. The dislocation can be effectively reduced by measures such as changing the direction of the construction joints or improving the shear strength at the horizontal joints.

关键词： Zipingpu CFRD construction joints dislocation numerical simulation Wenchuan earthquake

Web service composition algorithm based on TOPSIS

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The Journal of China Universities of Posts and Telecommunications 2011年第4期18卷 89-97页

作者： ZHANG long-chang zou Hua YANG Fang-Chun School of Marketing Management Liaoning Technical University Huludao 125105 China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Independent quality of service （QoS） registration center is difficult to monitor QoS with lots of requests in Intemet environment with a large number of services and lots of service requests. It is able to reduce the load and decrease the failure rate by using multiple QoS registration centers to monitor QoS of some services with lots of requests. In addition, the heterogeneous QoS data close to user＇s habitual expression and adapts to the environment with complexity and uncertainty. This paper introduces a novel Web service composition algorithm based on technique for order preference by similarity to an ideal solution （TOPSIS）（WSCA TOPSIS） to solve the above difficulties for the fu＇st time. WSCA TOPSIS can support multiple decision-makers and heterogeneous QoS data. It includes three main steps： normalizing decision matrix, evaluating alternatives synthetically and evaluating group alternatives synthetically. Other contributions of the paper include a novel algorithm of aggregating QoS and a set of experiments that demonstrate the benefits and effectiveness of our approach. Experimental results show that the proposed algorithm can better support Web service composition with heterogeneous QoS data and multiple decision-makers.

关键词： Web service service composition TOPSIS QoS multiple decision-makers