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application of Uniform Design and SVR for Culture Medium Optimization of Organophosphorus Degradation Bacteria

Agricultural Science & technology 2018年第6期19卷 43-47页

作者： TAN Xian-sheng ZHU Xiong-mei ZHOU Yu-liang LI Wei-wei LIU Li-na HU Jun-he JIN Chen-zhong LI Wen-juan Farmland Weed Prevention and Control Technology and Application-innovation Center of Hunan Province Hunan Institute ofHumanities Science and Technology Pesticide Harmless Application Key Laboratory of Provincial College Loudi 417000 PRC College of Agriculture and Biotechnology Hunan University of Humanities Science and Technology Loudi 417000 PRC

In order to improve the degradation activity of organophosphorus degradation bacterial strains, uniform design and support vector regression(SVR) are used to optimize the formula of mineral salt medium for the strains based on single factor experiment. The formula being used after SVR optimization is glucose 1.24 g/L,NH4 NO3 0.73 g, KH2 PO4 0.96 g, KCl 0.50 g, MgSO4·7 H2 O 0.50 g, MnSO4 0.02 g, CaCl2 0.04 g, distilled water 1 000 mL;the highest degradation rate is obtained at pH7.0(SVR, 76.68%), superior to that of the QSAR model(74.67%). The formula optimization method based on uniform design and SVR is very promising to apply in various multiple-factor and multiple-level formula optimization experiments.

关键词： Organophosphorus degradation bacteria Uniform design Support Vector Regression(SVR) Formula optimization

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Corrosion behavior of novel Cu-Ni-Al-Si alloy with super-high strength in 3.5% NaCl solution

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Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1096-1104页

作者： Jia-jun ZHU San-hua LI Lei-nuo SHEN Wu-lin YANG Zhou LI College of Materials Science and Engineering Hunan University Changsha 410082 China Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan University Changsha 410082 China School of Materials Science and Engineering Central South University Changsha 410083 China

A novel Cu?6.5Ni?1Al?1Si?0.15Mg?0.15Ce alloy with super-high strength was designed and its corrosion behavior in3.5%NaCl solution at25°C was investigated by the means of SEM observation,TEM observation and XPS *** alloy after solution treatment,80%cold rolling and aging at450°C for1h had the best comprehensive properties with hardness of HV314,electrical conductivity of19.4%IACS,tensile strength of1017MPa,and average annual corrosion rate of0.028mm/*** oxides and chloride products formed at first,followed by the formation of dyroxides *** alloy showed super-high strength,good electrical conductivity and corrosion resistant because Ni2Si hindered the precipitation of large NiAl at the grain boundary and the denickelefication of the alloy.

关键词： Cu-Ni-Al-Si alloy Ni2Si precipitate corrosion behavior average annual corrosion rate corrosion product

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An unconventional phase field modeling of domains formation and evolution in tetragonal ferroelectrics

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Science China(Technological Sciences) 2016年第7期59卷 1059-1064页

作者： ZHOU YouGang PENG JinLin PAN Kai LIU YunYa Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education and Key Laboratory of Materials Design and Preparation Technology of Hunan Province School of Materials Science and Engineering Xiangtan University

Based on characteristic functions of variants, we developed an unconventional phase field modeling for investigating domains formation and evolution in tetragonal ferroelectrics. In order to develop this computational approach, we constructed the anisotropy energy of tetragonal variants, which is used instead of Landau-Devonshire potential in the conventional phase field method, resulting in that much fewer parameters are needed for simulations. This approach is advantageous in simulations of emerging ferroelectric materials. We employ it to study the formation and evolution of domains in tetragonal barium titanate single crystal, as well as the nonlinear behaviors under cyclical stress and electric field loading. A multi-rank laminated ferroelectric domain pattern, 90° domain switching accompanied by polarization rotation, and 180° domain switching accompanied by move of domain wall are predicted. It is found that the speed of 90° domain switching is slower than that of 180° domain switching, due to both polarization and transformation strain changed in 90° domain switching. It also suggests that large strain actuation can be generated in single crystal ferroelectrics via combined electromechanical loading inducing 90° domain switching. The good agreement between simulation results and experimental measurements is observed.

关键词： phase field simulation ferroelectric domains formation and evolution ferroelectric materials

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Design of Power Consumption Tester for HPLC Power Line Carrier Communication Module

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Journal of Physics: Conference Series 2019年第2期1187卷

作者： Liu Mouhai Zhang Chenglin Liu Xiangbin Chen Hao Yang Maotao Chen Fusheng Shen Liman State Grid Hunan Electric Power Company Limited Power Supply Service Center(Metrology Center) Changsha 410004 China. Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology Changsha 410004 China. State Grid Hunan Technical Training Center Changsha 410004 China.

Due to the current situation that the power line carrier communication module power consumption test equipment has slow dynamic power consumption response and low AC power consumption test accuracy, the article deeply analyzes the key technical requirements of the communication module dynamic power consumption test, and focuses on a design of power consumption tester. The paper introduces the working principle of the tester, gives the circuit design scheme of DC power consumption and AC power consumption, and analyzes the calculation methods of static and dynamic power consumption in detail. Finally, the power consumption test results of various test systems are compared, and the test data is analyzed to conclude that the power consumption test data is stable, reliable, and high precision.

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Effect of erbium on homogenization in an Al-Cu-Mg alloy

Effect of erbium on homogenization in an Al-Cu-Mg alloy

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第三届全国有色金属结构材料制备/加工及应用技术交流会

作者： Xu Chen Sudan Zhai Di Gao Jing Xu Key Laboratory of Materials Design and Preparation Technology of Hunan Province Xiangtan University Key Laboratory of Materials Design and Preparation Technology of Hunan Province Xiangtan University Guangdong Provincial Key Laboratory for Technology and Application of Metal Toughening Guangdong In

Effect of rare-earth erbium addition on homogenization in an Al-Cu-Mg alloy has been systematically evaluated by employing optical microscopy (OM), scanning electron microscopy (SEM), differential scanning calorimeter (DSC), electron probe microanalysis (EPMA) and X-ray diffraction (XRD).The microstructures of the as-cast Al-Cu-Mg-Er alloy are identified as Al2Cu phase (θ phase), Al2CuMg phase (S phase) and Al8Cu4Er *** is nearly no change for the ternary Al8Cu4Er phase during the homogenization treatment heated at 480℃.The phase transformation from primary lamellar eutectic structure (θ and S phases) to round shape S phase is detected, and the ripening and coalescence occur on the S *** addition, the overburnt temperature of the Al-Cu-Mg-Er alloy is 490℃ and the suitable homogenization treatment is 480℃ x 36h, which is good consistent with the results of homogenizing kinetic analysis.

关键词： Erbium Al8Cu4Er phase Al2CuMg phase Homogenization Kinetic equation

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Effects of spin-coating speed on the morphology and photovoltaic performance of the diketopyrrolopyrrole-based terpolymer

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Science China Chemistry 2016年第4期59卷 466-471页

作者： Fen Wu Rongyan Hou Liang Yang Bin Zhao Songting Tan Key Laboratory of Environmentally Friendly Chemistry and Applications Ministry of Education College of Chemistry Xiangtan University Key Laboratory of Polymeric Materials & Application Technology of Hunan Province Xiangtan University

Polymer solar cells(PSCs) were fabricated by combining a diketopyrrolopyrrole-based terpolymer(PTBT-HTID-DPP) as the electron donor, and [6,6]-phenyl C_(61) butyric acid methyl ester(PC_(61)BM) as the electron acceptor, and the power conversion efficiency(PCE) of 4.31% has been achieved under AM 1.5 G(100 m W cm^(-2)) illumination condition via optimizing the polymer/PC_(61)BM ratio, the variety of solvent and the spin-coating speed. The impact of the spin-coating speed on the photovoltaic performance of the PSCs has been investigated by revealing the effects of the spin-coating speed on the morphology and the absorption spectra of the polymer/PC_(61)BM blend films. When the thickness of the blend films are adjusted by spin-coating a fixed concentration with different spin-coating speeds, the blend film prepared at a lower spin-coating speed shows a stronger absorption per unit thickness, and the correspond device shows higher IPCE value in the longer-wavelength region. Under the conditions of similar thickness, the blend film prepared at a lower spin-coating speed forms a more uniform microphase separation and smaller domain size which leads to a higher absorption intensity per unit thickness of the blend film in long wavenumber band, a larger short-circuit current density(J_(sc)) and a higher power conversion efficiency(PCE) of the PSC device. Noteworthily, it was found that spin-coating speed is not only a way to control the thickness of active layer but also an influencing factor on morphology and photovoltaic performance for the diketopyrrolopyrrole-based terpolymer.

关键词： polymer solar cells device optimization spin-coating speed morphology absorption per unit thickness

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Development of Live Working robot for Replacing Insulators on Power Transmission Lines

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Journal of Physics: Conference Series 2019年第2期1168卷

作者： Lanlan Liu Yu Yan Zhanfan Zhou Hao Guo Wen Li Zenghui Cao State Grid Hunan Maintenance Company Changsha 41000 China phone: + *** Hunan Province Key Laboratory of Intelligent Live Working Technology and Equipment (robot) Changsha 41000 China Live Patrol and IntelligentOperation Technology Laboratory of State Grid Changsha 41000 China Power Transmission Inspection Office of Yiyang Power Supply Branch of State Gride Hunan Power Co. LTD Changsha 41000 China

The paper presented the independently developed live working robot for replacing insulators on 110-220kV power transmission lines. By control system and simulating the manual equipotential live working process of replacing insulators, the robot is designed to be composed of a non-obstacle-surmounting platform, a control platform and a ground base station, among which the non-obstacle-surmounting platform mainly consists of the robot body, two robot arms, two robot hands, and two end-effectors, the control platform consists of a motion control system, a communication system, an image capture system and a power management system, and the ground base station consists of an industrial PC equipped with a wireless network interface card and a 3G network interface card. Moreover, the robot is designed to be protected against electromagnetic interference. The robot presented in this paper is the first of its kind in China.

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Effect of Seawater on Microstructure of Concrete-A Review

Effect of Seawater on Microstructure of Concrete-A Review

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第九届水泥混凝土国际会议

作者： Li Huang Nima Farzadnia Shi Caijun Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil EngineeringHunan University

Exposure of concrete to seawater impairs its performance due to chemical reactions between seawater constituents and the cement hydration *** paper reviews the effect of seawater on microstructure of concrete with a mainfocus on the formation of crystals,morphology,pore structure and phase change of hydration products by using SEM&EDX,TGA,XRD and *** is indicated that the exposure of seawater or mixed with seawater lead to the formation of crystals which reacted from salts in seawater and cement *** *** pore structure of concrete can be refined by precipitation formed by Mg,Cl,SOin seawater and hydration products of *** phase in cementitious materials and cement hydrates can also react with chloride and sulfate to form chloride binding,gypsum,*** formation of delayed ettringite by salts and cement hydrates resulted in the expansion of concrete.

关键词： seawater microstnicture hydration phase change concrete

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Surface Modification of PHBV Tissue Engineering Nanofibrous Scaffolds with Hyaluronic Acid

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hunan Daxue Xuebao/Journal of hunan University Natural Sciences 2017年第6期44卷 87-95页

作者： Liu, Hairong Huang, Jiying Zhou, Zheng Hu, Yibing Li, Yongsheng Zou, Peng Dai, Yao College of Materials Science and Engineering Hunan University Changsha410082 China College of Biology Hunan University Changsha410082 China Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan University Changsha410082 China Hunan Academy of Chinese Medicine Changsha410013 China

Surface properties of tissue engineering scaffold play important roles in cell adhesion and other biological processes such as cell proliferation, differentiation. In this study, the surface modification of Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was performed in order to improve the biological activity of material surface. PHBV nanofibrous scaffold was firstly made by electrostatic spinning method, introducing free amino groups in the PHBV surface through 1, 6-hexanediamine, which provided reaction sites for the further immobilization of hyaluronic acid (HA) macromolecules. The morphology observed by SEM showed that PHBV nanofibrous scaffolds prepared by electrostatic spinning method have smooth surfaces without obvious beads defects and their fiber diameters uniformly distribute. FTIR analysis proved that 1, 6-hexanediamine and hyaluronic acid modified PHBV fibrous scaffolds were successfully achieved. The ninhydrin determination results showed that the surface amine group density, which increased with the extending of aminolysis time, reached its maximum at 50 minutes. Furthermore, there is no significant difference on the morphology of the scaffolds before and after modification by statistic comparison. The water contact angle significantly decreased after the immobilization of hyaluronic acid, indicating that the hydrophilicity was obviously improved after surface modification with the hydrophilic natural biological macromolecules. The Alamar Blue assay manifested that hyaluronic acid modified PHBV nanofibrous scaffolds could significantly promote the chondrocytes proliferation in vitro. Therefore, the hyaluronic acid modified PHBV nanofibrous scaffolds are potential for application in cartilage tissue engineering. © 2017, Editorial Department of Journal of hunan University. All right reserved.

关键词： Biocompatibility

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Potential Use of Calcined Kaolinite-Based Wastes as Cement Replacements in Concrete – An Overview

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IOP Conference Series: Materials Science and Engineering 2018年第3期431卷

作者： Yuxuan Liu Tung-Chai Ling Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha 410082 Hunan China

The use of supplementary cementitious material (SCM) to partially replace cement is a promising strategy to reduce CO2 emission and improve the overall sustainability of construction industry. Recent studies revealed that calcined clay could be used as a pozzolanic material and demonstrated an improvement in durability properties of concrete. The pozzolanic reactivity of calcined clay mainly depends on the kaolinite content due to its disordered crystal structure. They can use to replace cement at considerably high level (~30%), and even higher (~50%) if addition limestone powder is used. Since kaolinite is the key source of pozzolanic activity, reusing kaolinite-based waste materials could be a promising and sustainable approach instead of exploiting natural clay for calcined clay cement. This paper summarises recent published works on the use of calcined kaolinite waste as partial cement substitutions in concrete, including thermally activated coal gangue and pre-calcined clay brick and ceramic wastes which have been burnt in their fabrication process. The properties of concrete using these kaolinite-based waste materials are also discussed.

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