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Evolution of soil DOM during thermal remediation below 100℃:concentration,spectral characteristics and complexation ability

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 31-41页

作者： wan Huang Ziren wan Di Zheng Lifeng Cao Guanghe Li Fang Zhang State Key Joint Laboratory of Environment Simulation and Pollution Control State Environment Protection Key Laboratory of Microorganism Application and Risk ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China National Engineering Laboratory for Site Remediation Technologies Beijing 100015China

The impact of thermal remediation on soil function has drawn increasing *** far,as the most active fraction of soil organic matter,the evolution of dissolved organic matter(DOM)during the thermal remediation lacks in-depth investigation,especially for the temperatures value below 100℃.In this study,a series of soil thermal treatment experiments was conducted at 30,60,and 90℃ during a 90-d period,where soil DOM concentration increased with heating temperature and *** molecular weight,functional groups content and aromaticity of DOM all decreased during the thermal *** excitation-emission matrices(EEM)results suggested that humic acid-like substances transformed into fulvic acid-like substances(FIII/FV increased from 0.27 to 0.44)during the heating process,and five DOM components were further identified by *** change of DOM structures and components indicated the decline of DOM stability and hydrophilicity,and can potentially change the bioavailability and *** temperature also resulted in the decline of DOM complexation ability,which may be caused by the loss of binding sites due to the decrease of polar function groups,aromatic structures and hydrophilic *** study provides valuable information about the evolution of DOM during thermal remediation,which would potentially change the fate of metal ions and the effectiveness of the post-treatment technologies in the treated region.

关键词： Thermal remediation below 100℃ Heating temperature Soil DOM concentration DOM spectral characteristics Excitation-emission matrices(EEM) Complexation ability

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A Numerical Investigation of the Thermal Performances of an Array of Heat Pipes for Battery Thermal Management

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Fluid Dynamics & Materials Processing 2019年第4期15卷 343-356页

作者： Chaoyi wan School of Automobile and Traffic Engineering Jiangsu University of TechnologyChangzhou213001China

A comparative numerical study has been conducted on the thermal performance of a heat pipe cooling system considering several influential factors such as the coolant flow rate,the coolant inlet temperature,and the input power.A comparison between numerical data and results available in the literature has demonstrated that our numerical procedure could successfully predict the heat transfer performance of the considered heat pipe cooling system for a *** indicators such as temperature,heat flux,and pressure loss were extracted to describe the characteristics of such a *** the basis of the distributions of the temperature ratio of the battery surface,together with the heat flux and the streamlines around the heat pipe condenser,we conclude that the low disturbance of the coolant is the cause of the temperature gradient along the fluid flow direction.

关键词： Battery thermal management heat pipe numerical model temperature difference

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A Discussion on Two Stochastic Elliptic Modeling Strategies

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Communications in Computational Physics 2012年第3期11卷 775-796页

作者： Xiaoliang wan Department of Mathematics and Center for Computation and Technology Louisiana State UniversityBaton RougeLA 70803USA

Based on the study of two commonly used stochastic elliptic models:I:−∇·(a(x,w)·∇u(x,w))=f(x)and II:−∇·(a(x,w)⋄∇u(x,w))=f(x),we constructed a new stochastic elliptic model III:−∇·(a^(−1))^(⋄(−1))⋄∇u(x,w)=f(x),in[20].The difference between models I and II is twofold:a scaling factor induced by the way of applying theWick product and the regularization induced by theWick product ***[20],we showed that model III has the same scaling factor as model *** this paper we present a detailed discussion about the difference between models I and III with respect to the two characteristic parameters of the random coefficient,i.e.,the standard deviation s and the correlation length *** results are presented for both one-and twodimensional cases.

关键词： Wiener chaos stochastic PDE stochastic modeling stochastic finite element method

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Scale Consistency Quantification for Subjective Evaluation of Vehicle Dynamics

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Automotive Innovation 2019年第2期2卷 121-126页

作者： wan’an Yang Pan Asia Automotive Technical Center Co.Ltd. No.2199 Jufeng RoadPudongShanghaiChina

The subjective evaluation of vehicle dynamics performance is widely applied in different stages of vehicle ***,the rating result has frequently been challenged because it is easily affected by various subjective and objective ***,there is no suitable index for determining evaluator’s consistency when performing a subjective evalua-tion of vehicle *** evaluation is quite unique,with limited samples,multiple indices,and poor repeatability,in addition to being stratified and two *** cross-grouped factor analysis(CFA)method is proposed to identify the scale for a subjective evaluation and to quantify its *** application case study revealed that the proposed method is effective.

关键词： Subjective evaluation Consistency Quantification Cross-grouped factor analysis

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An integrated stochastic model and algorithm for multi-product newsvendor problems

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International Journal of Modeling, Simulation, and Scientific Computing 2020年第4期11卷 53-77页

作者： Zhaoman wan Saihua Zhu Zhong wan School of Mathematics and Statistics Central South University ChangshaP.R.China

In this paper,a multi-product newsvendor problem is formulated as a random nonlinear integrated optimization model by taking into consideration the selling price,the producing and outsourcing quantities,and the nonlinear budget *** from the existing models,the demands of products depend on the prices,as well as being timevarying due to random market *** addition,outsourcing strategy is adopted to deal with possible shortage caused by the limited ***,the constructed model is involved with joint optimization of the producing and outsourcing quantities,and the selling prices of all the *** this model with continuous random demands,we first transform it into a nonlinear programming problem by expectation ***,an efficient algorithm,called the feasible-direction-based spectral conjugate gradient algorithm,is developed to find a robust solution of the *** case study and sensitivity analysis,some interesting conclusions are drawn as follows:(a)Budget is a critical constraint for optimizing the decision-making of the retailer,and there exist different threshold values of the budget for the substitute and complementarity scenarios.(b)The price sensitivity matrix seriously affects the maximal expected profit mainly through affecting the optimal outsourcing quantity.

关键词： Multi-product newsvendor problem efficient algorithm stochastic program spectral conjugate gradient method.

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Highly parallel implementation of sub-pixel interpolation for AVS HDTV decoder

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第12期9卷 1638-1643页

作者： wan-yi LI Lu YU Institute of Information and Communication Engineering Zhejiang University Hangzhou 310027 China

In this paper, we propose an effective VLS1 architecture of sub-pixel interpolation for motion compensation in the AVS HDTV decoder. To utilize the similar arithmetical operations of 15 luma sub-pixel positions, three types of interpolation filters are proposed. A simplified multiplier is presented due to the limited range of input in the chroma interpolation process. To improve the processing throughput, a parallel and pipelined computing architecture is adopted. The simulation results show that the proposed hardware implementation can satisfy the real-time constraint for the AVS HDTV （1 920× 1 088） 30 fps decoder by operating at 108 MHz with 38.18k logic gates. Meanwhile, it costs only 216 cycles to accomplish one macroblock, which means the B frame sub-pixel interpolation can be realized by using only one set of the proposed architecture under real-time constraints.

关键词： VLSI architecture Interpolation AVS HDTV

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Insights into the nitride-regulated processes at the electrolyte/electrode interface in quasi-solid-state lithium metal batteries

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Journal of Energy Chemistry 2022年第4期31卷 780-786页

作者： Jing wan wan-Ping Chen Gui-Xian Liu Yang Shi Sen Xin Yu-Guo Guo Rui Wen Li-Jun wan Key Laboratory of Molecular Nanostructure and Nanotechnology Beijing National Laboratory for Molecular SciencesCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Gel polymer electrolytes(GPEs)are one of the promising candidates for high-energy-density quasi-solid-state lithium metal batteries(QSSLMBs),for their high ionic conductivity and excellent interfacial *** comprehension of dynamic evolution and structure-reactivity correlation at the GPE/Li interface becomes ***,in situ electrochemical atomic force microscopy(EC-AFM)provides insights into the LiNO_(3)-regulated micromechanism of the Li plating/stripping processes upon cycles in GPE-based LMBs at *** additive LiNO_(3)induces the formation of amorphous nitride SEI film and facilitates Li^(+) ion *** stabilizes a compatible interface and regulates the Li nucleation/growth at steady *** deposited Li is in the shape of chunks and tightly *** Li dissolution shows favorable reversibility,which guarantees the cycling performance of *** situ AFM monitoring provides a deep understanding into the dynamic evolution of Li deposition/dissolution and the interphasial properties of tunable SEI film,regulating the rational design of electrolyte and optimizing interfacial establishment for GPE-based QSSLMBs.

关键词： In-situ electrochemical atomic force microscopy Gel polymer electrolyte Solid electrolyte interphase Lithium deposition/dissolution Quasi-solid-state lithium metal batteries

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Effect of Degree-of-Symmetry on Kinetostatic Characteristics of Flexure Mechanisms:A Comparative Case Study

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Chinese Journal of Mechanical Engineering 2018年第2期31卷 54-65页

作者： Xiao-Bing He Jing-Jun Yu wan-wan Zhang Guang-Bo Hao School of Mechanical Engineering and Automation Beihang University School of Engineering-Electrical and Electronic Engineering University College Cork

The current research of kinetostatic characteristics in flexure mechanisms mainly focus on the improvement of accuracy. To reduce or eliminate the parasitic motion is considered as an approach by using the common knowledge of symmetry. However, there is no study on designing the flexure mechanisms with symmetrical features as many as possible for better kinetostatic performance, when considering the resulting cost by the symmetry. In this paper, the concept of degree of symmetry(DoS) is proposed for the first time, which is committed to symmetry design in the phase of conceptual design. A class of flexure mechanisms with 0?DoS, 1?DoS, 2?DoS and 3?DoS are synthesized respectively based on the Freedom and Constraint Topology method. Their overall compliance matrices in an analytical form formulated within the framework of the screw theory are used to analyze and compare the effect of different number of DoS on the kinetostatic characteristics for flexure mechanisms. The finite element analysis(FEA) simulations are implemented to verify the analytical results. These results show that the higher the DoS is, the smaller the parasitic motion error will be. The flexure model with 3?DoS is optimized according to the overall compliance matrix and then tested by using the FEA simulation. The testing result shows that with the best combination parameters, the parasitic motion error for 3?DoS mechanism is almost eliminated. This research introduces a design principle which can alleviate the unwanted parasitic motion for better accuracy.

关键词： Flexure mechanism Symmetry Kinetostatic characteristics FEA simulation

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Multi-face detection based on downsampling and modified subtractive clustering for color images

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第1期8卷 72-78页

作者： KONG wan-zeng ZHU Shan-an School of Electrical Engineering Zhejiang University Hangzhou 310027 China

This paper presents a multi-face detection method for color images. The method is based on the assumption that faces are well separated from the background by skin color detection. These faces can be located by the proposed method which modifies the subtractive clustering. The modified clustering algorithm proposes a new definition of distance for multi-face detection, and its key parameters can be predetermined adaptively by statistical information of face objects in the image. Downsampling is employed to reduce the computation of clustering and speed up the process of the proposed method. The effectiveness of the proposed method is illustrated by three experiments.

关键词： Multi-face detection Skin color Modified subtractive clustering Downsampling

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Ensuring water security by utilizing roof-harvested rainwater and lake water treated with a low-cost integrated adsorption-filtration system

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Water Science and Engineering 2017年第2期10卷 115-124页

作者： Riffat Shaheed wan Hanna Melini wan Mohtar Ahmed El-Shafie Department of Civil and Structural Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan MalaysiaBandar Baru Bangi 43600 Malaysia

Drinking water is supplied through a centralized water supply system and may not be accessed by communities in rural areas of *** study investigated the performance of a low-cost, self-prepared combined activated carbon and sand filtration(CACSF) system for roofharvested rainwater and lake water for potable use. Activated carbon was self-prepared using locally sourced coconut shell and was activated using commonly available salt rather than a high-tech procedure that requires a chemical reagent. The filtration chamber was comprised of local,readily available sand. The experiments were conducted with varying antecedent dry intervals(ADIs) of up to 15 d and lake water with varying initial chemical oxygen demand(COD) concentration. The CACSF system managed to produce effluents complying with the drinking water standards for the parameters p H, dissolved oxygen(DO), biochemical oxygen demand(BOD5), COD, total suspended solids(TSS), and ammonia nitrogen(NH_3-N). The CACSF system successfully decreased the population of Escherichia coli(E. coli) in the influents to less than 30 CFU/m L. Samples with a higher population of E. coli(that is, greater than 30 CFU/m L) did not show 100% removal. The system also showed high potential as an alternative for treated drinking water for roof-harvested rainwater and class II lake water.

关键词： Low-cost activated carbon Integrated adsorption-sand filtration Roof-harvested rainwater Lake water Water security

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