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Microbial population dynamics and changes in main nutrients during the acidification process of pig manures

Journal of Environmental Sciences 2011年第3期23卷 497-505页

作者： Dongdong zhang Xufeng Yuan peng Guo Yali Suo Xiaofen Wang Weidong Wang Zongjun Cui College of Agronomy and Biotechnology/Center of Biomass Engineering China Agricultural University Beijing 100193 China College of Life Science Agricultural University of Hebei Baoding 071001 China

This study evaluated the impact of pig manure acidification on anaerobic treatment and composition of the fecal microbial community. According to the different chemical oxygen demand （COD） in the anaerobic treatment processes, pig manure was diluted 4 times （×4）, 16 times （×16）, or 64 times （×64） and subjected to acidification. During the acidification process, pH, soluble chemical oxygen demand （SCOD）, volatile fatty acids （VFAs）, nitrogen （N）, phosphorus （P） and potassium （K） were determined along with microbial population dynamics. The pH of the three dilutions first declined, and then slowly increased. The total VFAs of x4 and xl6 dilutions peaked on day 15 and 20, respectively. The content of acetic acid, propanoic acid, butanoic acid and valeric acid of the × 4 dilution were 23.6, 11.4, 8.8 and 0.6 g/L respectively, and that of the xl6 dilution was 5.6, 2.3, 0.9 and 0.2 g/L respectively. Only acetic acid was detected in the ×64 dilution, and its level peaked on day 10. The results showed that the liquid pig manure was more suitable to enter the anaerobic methanogenic hioreactors after two weeks of acidification. During the acidification process, total P concentration increased during the first ten days, then dropped sharply, and rose again to a relatively high final concentration, while total N concentration rose initially and then declined. Based on the analysis of denaturing gradient gel electrophoresis （DGGE） and 16S rRNA gene clone library, we concluded that the acidification process reduced the number of pathogenic bacteria species in pig manure.

关键词： pig manure acidification microbial population dynamics

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A hybrid rendering algorithm for textile objects

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Science in China(Series F) 2009年第3期52卷 490-499页

作者： zhang MingMin PAN zhiGeng SHI JiaoYing WANG peng MI QingFeng State Key Laboratory of CAD & CG Zhejiang University Hangzhou 310027 China

Although realistic textile rendering has been widely used in virtual garment and try-on systems, a robust method to simulate textile with a realistic appearance and high fidelity is yet to be established. We propose to use a novel hybrid geometric- and image-based rendering （GIBR） method to achieve photo realistic representation of textile products. The image-based technique, with its radiance synthesis algorithm, enables us to recover the reflectance properties of textile in an environment photo, and thus can render the appearance of textile material. The geometry-based technique, with its traditional illumination model of assigning illumination parameters extracted from the original scene （such as radiance and chroma dispatch）, makes it possible to interactively manipulate 3D virtual objects in the ＂real＂ environment. Our realistic textile rendering method has advantages over the traditional ones in its easiness to implement and its wide range of applications.

关键词： realistic rendering image and geometry hybrid radiance synthesis

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Quantifying Disaster Physical Damage Using Remote Sensing Data——A Technical Work Flow and Case Study of the 2014 Ludian Earthquake in China

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International Journal of Disaster Risk Science 2017年第4期8卷 471-488页

作者： Yida Fan Qi Wen Wei Wang Ping Wang Lingling Li peng zhang Information Center Ministry of Civil Affairs National Disaster Reduction Center of China Ministry of Civil Affairs

Disaster damage assessment is an important basis for the objective assessment of the social impacts of disasters and for the planning of recovery and reconstruction. It is also an important research field with regard to disaster mitigation and risk management. Quantitative assessment of physical damage refers to the determination of the physical damage state of the exposed elements in a disaster area, reflecting the aggregate quantities of damages. It plays a key role in the comprehensive damage assessment of major natural hazard-induced disasters. The National Disaster Reduction Center of China has established a technical work flow for the quantitative assessment of disaster physical damage using remote sensing *** article presents a quantitative assessment index system and method that can be integrated with high-resolution remote sensing data, basic geographical data, and field survey data. Following the 2014 Ludian Earthquake in Yunnan Province, China, this work flow was used to assess the damage to buildings, roads, and agricultural and forest resources, and the assessment results were incorporated into the Disaster Damage Comprehensive Assessment Report of the 2014 Ludian Earthquake for the State Council of China. This article also outlines some possible improvements that can be addressed in future work.

关键词： China Disaster damage assessment Ludian Earthquake Quantitative physical damage assessment Remote sensing in damage assessment

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Mechanism of the Curie-Weiss Law in Ferroelectrics

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Chinese Physics Letters 1999年第8期16卷 600-601页

作者： zhang Lei ZHONG Wei-lie WANG Chun-lei peng Yi-ping zhang Qun Department of Physics Shandong UniversityJinan 250100 Physics Teaching Section of Staff Training Branch Yanzhou Colliery Staff Training CollegeYanzhouShandong 273500

A simple double-well potential model is *** shows that the nature of the low-frequency dielectric constant in ferroelectrics is the additional hopping of the off-center ions in multi-site *** co-operative effect cause... 详细信息

关键词： potential. clarified dielectric

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Selective Permeation of CO_2 Through Modified PVSA/PS Composite Membrane

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Chinese Chemical Letters 2006年第2期17卷 277-280页

作者： Ying zhang zhi WANG Juan ZHAO Ji Xiao WANG Shi Chang WANG Chemical Engineering Research Center School of Chemical Engineering and Technology Tianjin University Tianjin 300072

A new fixed carder membrane material VSA-SA for CO2 separation was prepared through the chemical modification of PVSA. The selective permeation of CO2 through VSA-SA/PS composite membrane was performed with CO2/CH4 system. The VSA-SA/PS composite membranes possess better CO2 permselectivity than PVSA/PS composite membrane. Keywords： Fixed carder membrane, CO2 separation, PVSA, VSA-SA.

关键词： Fixed carder membrane CO2 separation PVSA VSA-SA.

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Solid-liquid Phase Equilibria in the Process of Producing Lithium Hydroxide from Lithium Sulfate

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Chemical Research in Chinese Universities 2019年第6期35卷 1018-1023页

作者： GUO Jian WU peng LI Yaoyao zhang Min LI Wenxuan ZHOU Huan College of Marine and Environmental Sciences Tianjin University of Science and TechnologyTianjin 300457P.R.China College of Chemical Engineering and Materials Science Tianjin Key Laboratory of Marine Resources and ChemistryTianjin University of Science and TechnologyTianjin 300457P.R.China

The solid-liquid phase equilibria in the process of producing lithium hydroxide from lithium sulfate at 283.15,298.15 and 323.15 K were studied via the isothermal solubility equilibrium method,and the solid species,phase diagrams,solution densities and pH were *** results show that four solid species of Na2SO4·10H2O,Na2SO4·2.5H2O,Na2SO4 and LiOH·H2O occurred in the system,among them,Na2SO4·2.5H2O was a new solid species not reported in the open literature,which was determined via chemical analysis,Karl Fischer water titration,X-ray diffraction(XRD),thermogravimetic analysis(TG)and differential scanning calorimetry(DSC)*** on the SLE data,one systemic process to produce LiOH·H2O from Li2SO4·H2O was proposed including two crystallization steps at lower and higher temperatures.

关键词： Solid-liquid equilibrium Phase diagram Lithium hydroxide Lithium sulfate Sodium sulfate

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Investigation on Degradation Path of SF_(6)in Packed-bed Plasma:Effect of Plasma-generated Radicals

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1231-1241页

作者： Zhaolun Cui Chang Zhou Amin Jafarzadeh Xiaoxing zhang peng Gao Licheng Li Yanpeng Hao School of Electric Power Engineering South China University of TechnologyGuangzhou 510630China School of Electrical and Electronic Engineering Hubei University of TechnologyWuhan 430068China Research group PLASMANT Department of ChemistryUniversity of AntwerpUniversiteitsplein 1BE-2610 Wilrijk-AntwerpBelgium CSEE

SF_(6)degradation mechanism in non-thermal plasma(NTP)systems is not fully understood due to the formation of a complex physico-chemical reaction network,especially when reactive gases and packing materials are *** this work,we conduct a combined experimental and theoretical study to unravel the SF_(6)degradation path in a-Al_(2)O_(3)packed plasma in the presence of H_(2)O or O_(2).Our experimental results show that both H_(2)O and O_(2)have a synergetic effect with-Al_(2)O_(3)packing on promoting SF_(6)degradation,leading to higher stable gas yields than typical spark or corona discharges.H_(2)O or O_(2)addition promotes SO_(2)or SO_(2)F_(2)selectivity,*** functional theory(DFT)calculations reveal that SO_(2)generation corresponding with the highest activation barrier is the most critical step toward SF_(6)*** like H and O generated from H_(2)O or O_(2)discharge can significantly promote the degradation process via Eley-Rideal mechanism,affecting key reactions of stable product generation,advancing degradation *** results of this work could provide insights on further understanding SF_(6)degradation mechanism especially in packed-bed plasma systems.

关键词： Degradation mechanism packed-bed plasma radicals SF_(6)

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Preparation of Dendritic Carbosilane-supported Palladium Catalyst and Its Catalytic Activity in Hydrogenation of Organic Compounds

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Chinese Chemical Letters 2005年第10期16卷 1389-1392页

作者： Chun Fang LI Dong Xiang LI zhi Jie zhang Sheng Yu FENG School of Chemistry and Chemical Engineering Shandong University Jinan 250100 School of Chemistry Chemical Engineering and Materials Shandong Normal University Jinan 250014 Institute of Chemistry Chinese Academy of Sciences Beijing 100080

The preparation of palladium complex from PdCl2·2H2O and carbosilane dendrimers with pelripheral aminopropyl groups was described. The compound obtained was characterized by IR, H NMR, X-ray photoelectron spectroscopy （XPS） and inductively coupled plasma atomic emission spectrometric （ICP-AES） spectroscopy respectively. The metal complex was employed as catalyst in hydrogenation of organic compounds. The high activity of the complex was probably due to the formation of the coordinatively unsaturated palladium.

关键词： Dendrimer complex catalysis.

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The first facile total synthesis of natural (3R,4R,6S)-3,4-epoxybisabola-7(14),10-dien-2-one

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Chinese Chemical Letters 2009年第9期20卷 1017-1018页

作者： zhi Yong Tang Chen Xi zhang Li Jing Fang Yu Lin Li State Key Laboratory of Applied Organic Chemistry and Institute of Organic Chemistry Lanzhou University Lanzhou 730000 China

3,4-Epoxybisabola-7（14）,10-dien-2-one, a natural sesquiterpoind, was first synthesized from （-）-carvone through 7 steps, in an overall yield of 35.9%. The key step was the allylation and then a substrate-directable epoxidation was committed successfully. 2009 zhi Yong Tang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Alkylation Epoxidation Synthesis

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Stress Concentration Effect in Interface Between Conductor and Epoxy Resin in Coaxial Components of Power Equipment

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 412-420页

作者： Chuang Wang Kang Lei Qing Sun Hui Li Jiawei zhang Lang Zhao Zongren peng School of Electrical Engineering Xi’an University of TechnologyXi’an 710054China Xi’an Power Supply Company State Grid Shaanxi Electric Power CompanyXi’an 710032China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China

The spacer used in gas insulated switchgear(GIS)plays a vital role in its safe *** mismatch of mechanical properties between conductor and insulating material in spacers results in stress concentration at the interface between *** a hydrostatic test,mechanical damages are often initiated from the *** this paper,the stress between aluminum conductors and epoxy resin is studied by using a simplified coaxial structure *** measurement system and finite element simulation are used to explore the generation of stress and strain during curing and *** real-time measurement of strain at the interface shows that the residual strain in the entire process is primarily generated during the cooling ***,the temperature and stress/strain distribution at the interface during the cooling stage are further studied,and combined with experiments and *** consistency between the finite element simulation and the experimental measurement results verifies the validity of the simulation method *** results show that the maximum of the first principal stress generated during the cooling stage of the production process is concentrated on the upper and lower edges of the interface which is critical to the impact of the production quality of the spacer.

关键词： Epoxy resin GIS interface stress/strain distribution

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