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Potential particulate pollution derived from UV-induced degradation of odorous dimethyl sulfide

Journal of Environmental Sciences 2011年第1期23卷 51-59页

作者： liping Qiao Jianmin chen Xin Yang Center for Atmospheric Chemistry Studies Department of Environmental Science 6r Engineering Fudan University Shanghai 200433 China

UV-induced degradation of odorous dimethyl sulfide （DMS） was carried out in a static White cell chamber with UV irradiation. The combination of in situ Fourier transform infrared （FT-IR） spectrometer, gas chromatograph-mass spectrometer （GC-MS）, wide-range particle spectrometer （WPS） technique, filter sampling and ion chromatographic （IC） analysis was used to monitor the gaseous and potential particulate products. During 240 min of UV irradiation, the degradation efficiency of DMS attained 20.9%, and partially oxidized sulfur-containing gaseous products, such as sulfur dioxide （SO2）, carbonyl sulfide （OCS）, dimethyl sulfoxide （DMSO）, dimethyl sulfone （DMSO2） and dimethyl disulfide （DMDS） were identified by in situ FT-IR and GC-MS analysis, respectively. Accompanying with the oxidation of DMS, suspended particles were directly detected to be formed by WPS techniques. These particles were measured mainly in the size range of accumulation mode, and increased their count median diameter throughout the whole removal process. IC analysis of the filter samples revealed that methanesulfonic acid （MSA）, sulfuric acid （H2SO4） and other unidentified chemicals accounted for the major non-refractory compositions of these particles. Based on products analysis and possible intermediates formed, the degradation pathways of DMS were proposed as the combination of the O（1D）- and the OH- initiated oxidation mechanisms. A plausible formation mechanism of the suspended particles was also analyzed. It is concluded that UV-induced degradation of odorous DMS is potentially a source of particulate pollutants in the atmosphere.

关键词： UV irradiation photodegradation dimethyl sulfide particulate pollutants odorous emission

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Adiabatic correction for the esterification of acetic anhydride by methanol via accurate kinetics

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Chinese Journal of Chemical Engineering 2018年第9期26卷 1954-1959页

作者： Ze Dong liping chen Yingying Ma Haoliang Peng Wanghua chen Nanjing University of Science & Technology School of Chemical Engineering Solvay (China) Co. Ltd.

In the field of adiabatic correction for complex reactions,a simple one-stage kinetic model was used to estimate the real reaction ***,this assumption simplified the real process,inevitably generated inaccurate or even unsafe ***,it was necessary to find a new correction method for complex *** this work,esterification of acetic anhydride by methanol was chosen as an object reaction of *** reaction was studied under different conditions by Reaction Calorimeter(RC1).Then,Thermal Safety Software(TSS)was used to establish the kinetic model and estimate the parameters,where,activation energies for three stages were67.09,81.02,73.77 kJ?mol^(-1)respectively,and corresponding frequency factors in logarithmic form were 16.05,19.59,15.72 s^(-1).In addition,two adiabatic tests were performed by Vent Sizing Package2(VSP2).For accurate correction of VSP2 tests,a new correction method based on Enhanced Fisher method was *** with kinetics,adiabatic correction of esterification reaction was *** this research,accurate kinetic parameters for a three-step kinetic model of the esterification reaction were ***,the correlation coefficients between simulated curves and corrected curves were 0.976 and 0.968,which proved the accuracy of proposed new adiabatic correction *** on this new method,conservative corrected results were able to be acquired and be applied in safety assessment.

关键词： Adiabatic correction Kinetics New method Complex reaction Esterification Model reaction

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TOPOLOGY SYNTHESIS OF GEOMETRICALLY NONLINEAR COMPLIANT MECHANISMS USING MESHLESS METHODS

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Acta Mechanica Solida Sinica 2008年第1期21卷 51-61页

作者： Yixian Du liping chen Zhen Luo School of Mechanical Science ＆ Engineering Huazhong University of Science ＆ Technology Wuhan 430074 China School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney NSW 2006 Australia

This paper presents a new method for topology optimization of geometrical nonlinear compliant mechanisms using the element-free Galerkin method （EFGM）. The EFGM is employed as an alternative scheme to numerically solve the state equations by fully taking advantage of its capability in dealing with large displacement problems. In the meshless method, the imposition of essential boundary conditions is also addressed. The popularly studied solid isotropic material with the penalization （SIMP） scheme is used to represent the nonlinear dependence between material properties and regularized discrete densities. The output displacement is regarded as the objective function and the adjoint method is applied to finding the sensitivity of the design functions. As a result, the optimization of compliant mechanisms is mathematically established as a nonlinear programming problem, to which the method of moving asymptotes （MMA） belonging to the sequential convex programming can be applied. The availability of the present method is finally demonstrated with several widely investigated numerical examples.

关键词： compliant mechanisms topology optimization element-free Galerkin methods,geometrical nonlinearity

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Linear homotopy method for computing generalized tensor eigenpairs

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Frontiers of Mathematics in China 2017年第6期12卷 1303-1317页

作者： liping chen Lixing HAN Liangmin ZHOU Department of Mathematics Michigan State University East Lansing MI 48824 USA Department of Mathematicsl University of Michigan-Flint Flint MI 48502 USA

Let m, m＇, n be positive integers such that m ≠ m＇. Let A be an ruth order n-dimensional tensor, and let B be an m＇th order n-dimensional tensor. ）, ∈ C is called a B-eigenvalue of A if Ax^m-1 = λBx^m＇-1 and Bx^m＇ = 1 for some x ∈ Cn／{0}. In this paper, we propose a linear homotopy method for solving this eigenproblem. We prove that the method finds all isolated B- eigenpairs. Moreover, it is easy to implement. Numerical results are provided to show the efficiency of the proposed method.

关键词： Tensors generalized eigenpairs polynomial systems linear homotopy

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Superhydrophobicity-mediated enhanced enzymatic kinetics and high-performance bioassays

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Droplet 2023年第2期2卷 16-26页

作者： Dandan Wang liping chen Xinjian Feng College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhouChina Innovation Center for Chemical Science Soochow UniversitySuzhouChina

As a typical superwettability behavior,superhydrophobicity can provide an appropriate strategy to enhance the mass transport in multiphase chemical *** the oxidase-based enzymatic reactions,the elaborately regulating of reactant oxygen are critical to the development of an oxidase-based high-performance *** solid–liquid diphase condition,however,the kinetics of oxidase-catalyzed reactions is inhibited by delayed mass transport and poor solubility of *** address this limitation,the design of the solid–liquid–air triphase interface is proposed according to the binary cooperation of superhydrophobicity and *** the triphase joint interface,oxygen required for the oxidase-catalyzed reactions can diffuse directly to the reaction center from the air phase through the micro/nanostructured superhydrophobic substrate,thus improving the kinetics of the oxidase-catalyzed *** this minireview,we summarize recent advances in the fabrication of triphase reaction system based on different superhydrophobic substrate for oxidase-based *** substrates including fibrous network,nanowire arrays,3D porous framework,and hollow sphere structures are outlined in categories.

关键词： kinetics performance interface

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STUDY OF TOPOLOGY OPTIMIZATION FOR THERMO-STRUCTURAL COUPLING FIELD

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Acta Mechanica Solida Sinica 2005年第4期18卷 357-364页

作者： Zuo Kongtian Qian Qin Zhao Yudong chen liping Department of Automotive Engineering Tsinghua University Beijing 100084 China Department of Mechanics Huazhong University of Science and Technology Wuhan 430074 China CAD center Huazhong University of Science and Technology Wuhan 430074 China

A number of critical problems of topology optimization concerning the thermostructural coupling field axe studied at length. The governing equations and topology optimization model for the thermal-structural coupling field axe derived, with an adjoint method for sensitivity analysis of the thermo-structural coupling field proposed. The optimization algorithm for coupling field topology optimization is investigated and a flowchart of coupling field topology optimization presented. The theory and algorithms axe implemented and verified by two numerical examples.

关键词： thermo-structural coupling field topology optimization sensitivity analysis numerical calculation

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HYDROSTATIC PRESSURE CALCULATION AND OPTIMIZATION FOR DESIGN OF BEAM & SLIDE-REST GUIDEWAYS IN HEAVY DUTY CNC VERTICAL TURNING MILL

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Chinese Journal of Mechanical Engineering 2007年第5期20卷 16-22页

作者： ZHAO Ming HUANG Zhengdong LI Bin chen liping CAD Center Huazhong University of Science and Technology Wuhan 430074. China

Aiming at the approximate error of commonly used methods on calculation of hydrostatic pressures of closed hydrostatic guideways with multiple pockets, a more accurate solution is proposed. Taking design of beam ＆ slide-rest guideways for a heavy duty CNC vertical turning mill as an example, under an assumption that stiffnesses of guideways and their jointing structure are sufficiently large, the pressures of the pockets can be attained by adding a co-planarity equation that constrains pocket centers. Then, an optimization model is built to minimize the highest pocket pressure under additional constraints that are posed on the highest seal margin pressure, the highest levitating pressure of the pockets, and the maximum deformation of the guideways. The optimization problem is solved sequentially by using the methods of design of experiments and adaptive simulated annealing on iSIGHT software platform. The results show significant improvements to the original design. Optimized maximum hydrostatic pressure meets the requirement of hydraulic system.

关键词： CNC vertical turning mill Beam Slide rest Hydrostatic guideway Parameter optimization

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Rhizosphere Aeration Improves Nitrogen Transformation in Soil, and Nitrogen Absorption and Accumulation in Rice Plants

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Rice science 2020年第2期27卷 162-174页

作者： XU Chunmei chen liping chen Song CHU Guang WANG Danying ZHANG Xiufu China National Rice Research Institute Chinese Academy of Agricultural SciencesHangzhou 310006China

Two rice cultivars(Xiushui 09 and Chunyou 84)were used to evaluate the effects of various soil oxygen(O2)conditions on soil nitrogen(N)transformation,absorption and accumulation in rice *** treatments were continuous flooding(CF),continuous flooding and aeration(CFA),and alternate wetting and drying(AWD).The results showed that the AWD and CFA treatments improved soil N transformation,rice growth,and N absorption and *** NO3–content,nitrification activity and ammonia-oxidising bacteria abundance,leaf area,nitrate reductase activity,and N absorption and accumulation in rice all increased in both ***,soil microbial biomass carbon and pH did not significantly change during the whole period of rice *** analysis revealed a significant positive correlation between the nitrification activity and ammonia-oxidising bacteria abundance,and both of them significantly increased as the total N accumulation in rice *** results indicated that improved soil O2 conditions led to changing soil N cycling and contributed to increases in N absorption and accumulation by rice in paddy fields.

关键词： ammonium-nitrogen content nitrate-nitrogen content nitrification activity nitrate reductase activity rhizosphere oxygen condition ammonia-oxidising bacteria abundance rice nitrogen use efficiency

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Spatial variations of macrozoobenthos and sediment nutrients in Lake Yangcheng: Emphasis on effect of pen culture of Chinese mitten crab

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Journal of Environmental Sciences 2015年第11期27卷 118-129页

作者： liping chen Ying Zhang Qigen Liu Zhongjun Hu Yuejuan Sun Ziran Peng Lijing chen Key Laboratory of Freshwater Fishery Germplasm Resources Ministry of Agriculture Shanghai Ocean University

We determined the effect of Chinese mitten crab（CMC） pen culture on the quantified spatial distribution of the macrozoobenthic community and sediment nutrients in Lake *** analysis indicated that water temperature, macrophyte occurrence, sediment type, and crab culture were the main environmental factors that influence the spatiotemporal macrozoobenthic distribution. Macrozoobenthic assemblages in the lake were characterized by eutrophic indicator species. In the most polluted estuaries, the abundance and diversity indices of the whole community and abundance of chironomids and oligochaetes were significantly depressed, and sediment carbon（C） and phosphorus（P） were significantly enhanced compared with those in the western, middle（MB）, and eastern basin（EB）. Crab culture in this lake had significant effects on the species composition of the macrozoobenthic community in one of three CMC culture pens（CP）, and generally depressed the abundance of most chironomid and oligochaete species. Significantly increased diversity, evenness, sediment carbon and nitrogen content, and sediment C：P ratio in the CP were found compared with those in the three ***, no conspicuous difference in sediment P content between the CP and the two basins of MB and EB was detected. Our results showed that the enhanced diversity and evenness of macrozoobenthos might be associated with the joint effect of macrophyte planting and crab predation, and macrophyte planting may modify the effects of CMC culture by leading to disproportional accumulation of C and N in the sediment relative to P in the CP of the lake.

关键词： Lake Yangcheng Benthic macroinvertebrate Community structure Sediment nutrient Spatial distribution Pen farming

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THE SURFACE MODIFICATION OF ZEOLITE-4A BY CTMAB AND ITS PROPERTIES

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Journal of Wuhan University of Technology(Materials Science) 1999年第4期14卷 18-23页

作者： GUO liping chen Yinzhou YANG Jing Wuhan University of Technology Wuhan University of Technology China Coll. of Mat. Sci. and Engineering Wuhan University of Technology Wuhan 430070 China

The structure and properties of zeolite- 4A modified by hexadecyltrimethyl ammonium bromide (CTMAB) were investigated in this *** char- acterization proved that surface modification onlyinflu- enced the external surface structure and properties of zeo-lite-4A. Properties testing showed that the surface mdi- fication inproved the dispersity of zeolite-4A n lower polar and non-polarsolvents and the adsorbability dyestuff of zeolite-4A in aqueoussolution.

关键词： porous materials surface modification zeolite-4A

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