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Immobilized Lentinus edodes residue as absorbent for the enhancement of cadmium adsorption performance

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Frontiers of Environmental Science & Engineering 2012年第4期6卷 498-508页

作者： pei MA Dan zhang Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China Institute of Mountain Hazards and Environment Chinese Academy of Sciences and Ministry of Water ConservancyChengdu 610041China

To investigate the potential use of Lentinus edodes （L. edodes） residue for Cd^2＋ adsorption, poly alcohol Na alginate （PVA） was applied to immobilize it. The parameters including contact time, pH, adsorbent dosages, and coexisting metal ions were studied. The suitable pH for immobilized L. edodes was 4-7 wider than that for raw L. edodes （pH 6-7）. In the presence of Pb^2＋ concentration varying from 0 to 30mg.L^-1, the Cd^2＋ adsorption ratios declined by 6.71% and 47.45% for immobilized and raw L. edodes, respectively. While, with the coexisting ion Cu2＋ concentration varied from 0 to 30 mg.L^-1, the Cd^2＋ adsorption ratios declined by 12.97% and 50.56% for immobilized and raw L. edodes, respectively. The Cd^2＋ adsorption isotherms in singlemetal and dual-metal solutions were analyzed by using Langmuir, Freuxldlich, and Dubinin-Radushkevich models. The Cd^2＋ adsorption capacities （qm） in single-metal solution were 6.448 mg.L^-1 and 2.832 mg.L^-1 for immobilized and raw L. edodes, respectively. The qm of immobilized L. edodes were 1.850 mg Cd. gl in Cd^2＋＋ Pb^2＋ solution and 3.961mg Cd.g^-1 in Cd^2＋＋ Cu^2＋ solution, respectively. The Cd^2＋ adsorption processes subjected to both adsorbents follow pseudo-second-order model. Mechanism study showed the functional group of L. edodes was -OH, -NH, -CO, and PVA played an important role in metal adsorbing. Mining wastewater treatment test showed that PVA-SA-immobilized L. edodes was effective in mixed pollutant treatment even for wastewater containing metal ions in very low concentration.

关键词： competitive immobilization Lentinus edodes residue adsorption isotherm

Approach to conceptual data integration for multidimensional data analysis in e-commerce

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Journal of Systems Engineering and Electronics 2006年第3期17卷 635-641页

作者： zhang Zhe Huang pei School of Management Fudan Univ. Shanghai 200433P. R. China School of Management Shanghai Jiaotong Univ. Shanghai 200052 P. R. China

In e-commerce the multidimensional data analysis based on the Web data needs integrating various data sources such as XML data and relational data on the conceptual level. A conceptual data description approach to multidimensional data model the UML galaxy diagram is presented in order to conduct multidimensional data analysis for multiple subjects. The approach is illuminated using a case of 2_roots UML galaxy diagram that takes marketing analysis of TV products involved one retailer and several suppliers into consideration.

关键词： conceptual data integration multidimensional data analysis e-commerce

Interpreting random fields through the U-Net architecture for failure mechanism and deformation predictions of geosystems

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Geoscience Frontiers 2024年第1期15卷 209-224页

作者： ze Zhou Wang Jinzhang zhang Hongwei Huang Department of Civil and Environmental Engineering National University of SingaporeSingapore 117576Singapore Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education and Department of Geotechnical Engineering Tongji UniversityShanghai 200092China

The representation of spatial variation of soil properties in the form of random fields permits advanced probabilistic assessment of slope *** many studies,the safety margin of the system is typically characterized by the term“probability of failure(Pfailure)”.As the intensity and spatial distribution of soil properties vary in different random field realizations,the failure mechanism and deformation field of a slope can vary as *** only can the location of the failure surfaces vary,but the mode of failure also *** information is equally valuable to engineering *** this paper,two slope examples that are modified from a real case study are *** first example pertains to the stability analysis of a multi-layer-slope while the second example deals with the serviceability analysis of a multi-layer c-φ*** addition,due to the large number of simulations needed to reveal the full picture of the failure mechanism,Convolutional Neural Networks(CNNs)that adopt a U-Net architecture is proposed to offer a soft computing strategy to facilitate the *** spatial distribution of the failure surfaces,the statistics of the sliding volume,and the statistics of the deformation field are *** results also show that the proposed deep-learning model is effective in predicting the failure mechanism and deformation field of slopes in spatially variable soils;therefore encouraging probabilistic study of slopes in practical scenarios.

关键词： Deep-learning Spatial variability Slope stability Failure mechanism Sliding volume

Recent advances in gas-involved in situ studies via transmission electron microscopy

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Nano Research 2018年第1期11卷 42-67页

作者： Ying Jiang Zhengfei zhang Wentao Yuan Xun zhang Yong wang ze zhang Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China Materials Genome Institute Shanghai University Shanghai 200444 China

Gases that are widely used in research and industry have a significant effect on both the configuration of solid materials and the evolution of reactive systems. Traditional studies on gas-solid interactions have mostly been static and post-mortem and unsatisfactory for elucidating the real active states during the reactions. Recent developments of controlled-atmosphere transmission electron microscopy （TEM） have led to impressive progress towards the simulation of real-world reaction environments, allowing the atomic-scale recording of dynamic events. In this review, on the basis of the in situ research of our group, we outline the principles and features of the controlled-atmosphere TEM techniques and summarize the significant recent progress in the research activities on gas-solid interactions, including nanowire growth, catalysis, and metal failure. Additionally, the challenges and opportunities in the real-time observations on such platform are discussed.

关键词： controlled-atmospheretransmission electronmicroscopy (TEM) nanowire growth catalysis metal failure

Multi-objective optimization for 10-kW rated power dynamic wireless charging systems of electric vehicles

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Science China(Information Sciences) 2022年第10期65卷 178-195页

作者： ze ZHOU Zhitao LIU Hongye SU Liyan zhang State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University School of Automation Wuhan University of Technology

In this paper, we propose a method to optimize the output power, efficiency, and cost of the dynamic wireless charging(DWC) system of electric vehicles by using the transmitting coil spacing as the decision variable. In a set of transmitting equipment, we adopt a structure with two transmitting networks in parallel and derive loss models. The expressions of the output power and efficiency of the DWC system are obtained by data fitting. In addition, combined with the proposed cost function, we construct a multiobjective optimization problem on output power, efficiency, and cost. Due to the complexity of the objective function, it is difficult to solve the problem by the analytic method, and thus we propose a constrained adaptive particle swarm optimization(CAPSO) algorithm with high accuracy to solve the problem. Finally,the simulation results verify the feasibility of the proposed model. The advantages of the proposed CAPSO algorithm and the optimization results under different weight combinations are presented.

关键词： dynamic wireless charging electric vehicles multi-objective optimization constrained adaptive particle swarm optimization

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CFD simulation of a gas-solid fluidized bed with two vertical jets

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Particuology 2010年第5期8卷 425-432页

作者： pei pei Kai zhang Jintian Ren Dongsheng Wen Guiying Wu State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China School of Engineering and Materials Science Queen Mary University of London Mile End Road London E1 4NS UK National Engineering Laboratory for Biomass Power Generation Equipment North China Electric Power University Beijing 102206 China

A computational fluid dynamics （CFD） model is used to investigate the hydrodynamics of a gas-solid fluidized bed with two vertical jets. Sand particles with a density of 2660 kg/m3 and a diameter of 5.0 × 10^-4 m are employed as the solid phase. Numerical computation is carried out in a 0.57 m ×1.00 m two-dimensional bed using a commercial CFD code, CFX 4.4, together with user-defined Fortran subroutines. The applicability of the CFD model is validated by predicting the bed pressure drop in a bubbling fluidized bed, and the jet detachment time and equivalent bubble diameter in a fluidized bed with a single jet. Subsequently, the model is used to explore the hydrodynamics of two vertical jets in a fluidized bed. The computational results reveal three flow patterns, isolated, merged and transitional jets, depending on the nozzle separation distance and jet gas velocity and influencing significantly the solid circulation pattern. The jet penetration depth is found to increase with increasing jet gas velocity, and can be predicted reasonably well by the correlations of Hong et al. （2003） for isolated jets and of Yang and Keairns （1979） for interacting jets.

关键词： Gas-solid fluidized bedTwo vertical jetsFluid dynamicsCFD model

Complete Composition Tunability of Cu(Ni)-Ti-Zr Alloys for Bulk Metallic Glass Formation

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Journal of Materials Science & Technology 2009年第1期25卷 39-47页

作者： ze-xiu zhang Chun-li Dai Jian Xu Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China

In the Cu-Zr-Ti ternary system, a new composition zone of bulk metallic glasses （BMGs） formation was discovered, locating at the 55-57 at. pct Cu, 30-31 at. pct Ti and 13-14 at. pct Zr, and near Cu-Ti binary subsystem rather than the Cu-Zr binary. For these alloys, BMG rods of 2 mm in diameter can be fabricated by using copper mould casting. It is expected that these 13MG-forming alloys correlate with （L →CuTi＋Cu2TiZr＋Cu51Zr14） eutectic reaction that the undercooled melt undergoes during solidification. Adopting ＂3D pinpointing approach＂, compositional dependence of glass-forming ability （GFA） in Cu（Ni）-Ti-Zr pseudo ternary system was revisited. Optimized BMG-forming composition is located at Cu50.4Ni5.6Ti31Zr13, with a critical diameter of 6 mm for complete BMG formation. Its GFA is significantly superior to Vit 101 （Cu47Ni8Ti34Zr11） previously developed by Caltech group. The effect that the GFA of the ternary base alloy was improved by substitution of Ni for Cu is attributed to a role of retarding the crystallization of Cu51Zr14 intermetallics.

关键词： Bulk metallic glasses Amorphous alloys Eutectic Copper

Entanglement Properties of Two-Mode Squeezed Coherent States in Radiation Field

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Communications in Theoretical Physics 2008年第4期49卷 1013-1016页

作者： PING Yun-Xia CHENG ze zhang Bo CHENG Zheng-ze Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

Entanglement properties of two-mode squeezed coherent states in the radiation field ＆re investigated according to the entanglement criterion [Phys. Rev. Lett. 84 （2000） 2722]. The dependence of entanglement on squeeze angle and squeeze parameter is discussed. It shows that the system evolves into entangled states and entanglement does not increase persistently with the increase of squeeze angle and squeeze parameter. There only exists a certain squeeze angle in which the entanglement exists continuously.

关键词： entanglement two-mode squeezed coherent states radiation field

Adsorption and Diffusion of Hydrogen Atom on Low-index Ag Planes

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Chinese Journal of Structural Chemistry 2005年第10期24卷 1217-1223页

作者： zhang Jing DIAO Zhao-Yu WANG ze-Xin Department of Chemistry Shandong Normal University Jinan 250014 China

The 5-parameter Morse potential （5-MP） of the interaction between H atom and Ag surfaces has been constructed. The adsorption and diffusion of H on Ag low-index surfaces are investigated with 5-MP in detail. The characteristics of critical points are obtained. The theoretical results show that H atom can only adsorb at the three-fold site on Ag（111 ）; the quasi-3-fold site and long-bridge site are stable adsorption sites on Ag（110） surface for the H atom, and at low coverage hydrogen predominantly occupies the quasi-3-fold site. This work predicts that the four-fold hollow site is the most stable adsorption state for H atom on Ag（100）. The results of this work are approved by the experimental and theoretical results.

关键词： H-Ag system 5-MP adsorption vibration low-index surfaces