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Large-scale carambola-like V_(2.O_(5) nanoflowers arrays on microporous reed carbon as improved electrochemical performances lithium-ion batteries cathode

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Journal of Energy Chemistry 2020年第12期29卷 388-395页

作者： hua Tan Xin Zhi Yu Kai huang Jianxin {2. Bingan Lu School of Physics and Optoelectronics Hunan Institute of Advanced Sensing and Information TechnologyXiangtan UniversityXiangtan 41U05HunanChina School of Physics and Electronics State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan Provincial Key Laboratory of Multi-electron based Energy Storage DevicesHunan UniversityChangsha 410083HunanChina

To search for new cathode materials with high energy density of Lithium-ion batteries(LIBs) is one of the most challenging issues. Vanadium pentoxide(V2.O5) with high theoretical specific capacity is believed to be a promising candidate for the next generation cathode materials, yet still suffers from low lithium ion diffusion coefficient and poor electronic conductivity resulting in low cycling life and poor rate performances. Here, we report new large-scale carambola-like V2.O5 nanoflowers arrays anchored on microporous reed carbon as high performances LIBs cathode. Each individual pore space of the microporous reed carbon is like a hexagonal cylinder, and the area of each carbon wall is more than103 um2. which is favorable for the growth of V2.O5 nanostructure arrays. After hydrothermal, the largescale carambola-like V2.O5 nanoflowers arrays can directly grow on the surface of microporous *** to the novel composite structures, the V2.O5 nanoflowers arrays@microporous carbon stabilizes at2.3 mA h g^(-1) after 100 cycles at 0.2.C. When cycling at 1.0 C over 500 cycles, the capacity still maintains at 180 mAh g^(-1). The demonstrated approach in this work paves the way for the development of high rate capability and excellent cycling stability V2.O5-based cathode materials.

关键词： V_(2.O_(5) Cathode Reed carbon Microporous Lithium-ion batteries

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Enhanced formation of trihalomethane disinfection byproducts from halobenzoquinones under combined UV/chlorine conditions

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Frontiers of Environmental science & Engineering 2022年第6期16卷 109-119页

作者： He Zhao Ching-hua huang Chen {2. Penghui Du Peizhe Sun Beijing Engineering Research Center of Process Pollution Control Division of Environment Technology and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA 30332USA state Environmental Protection key {2. of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China School of Environmental science and Engineering Tianjin UniversityTianjin 300072China

Halobenzoquinones(HBQs)are highly toxic disinfection byproducts(DBPs)and are also precursors of other DBPs such as trihalomethanes(THMs).The formation of THMs from HBQs during chlorine-only and UV/chlorine processes with or without bromide was investigated *** functional theory(DFT)reactivity descriptors were also applied to predict the nucleophilic/electrophilic reactive sites on HBQs and *** results were combined to explain the different behaviors of 2.6-dichloro-1,4-benzoquinone(2.6-DCBQ)and tetrachloro-1,4-benzoquinone(TCBQ)and to propose mechanism for the promoting roles of UV and hydroxylation of HBQs in THMs *** UV/chlorine,UV significantly enhanced THMs formation from 2.6-DCBQ compared to chlorine-only,mainly due to the production of OH-DCBQ^(*).Excited 2.6-DCBQ^(*)by UV benefited nucleophilic hydrolysis to produce OH-DCBQ^(*),which favored electrophilic attack by chlorine,thereby inducing more THMs ***/chlorine modestly promoted THMs formation from TCBQ compared to *** of TCBQ and UV irradiation were both important in promoting THMs formation due to the high electrophilic property of OH-TCBQ and TCBQ^(*).Meanwhile,hydroxylation of HBQs and CHCl3 formation were enhanced at higher *** work suggested that enhanced formation of THMs from HBQs should be considered in the application of combined UV and chlorine processes.

关键词： Halobenzoquinone Trihalomethane Chlorine disinfection UV irradiation Disinfection byproducts Combined UV/chlorine

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Shape Setup System for 1700 Hot Strip Mill

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Journal of Iron and Steel Research International 2007年第5期14卷 27-30页

作者： GUO zhong-feng XU Jian-zhong LI Chang-sheng LIU Xiang-{2. state key {2. of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

Shape setup （SSU） system is the core technology for hot strip mill （HSM）. A precise SSU system was used to improve the strip quality for HSM. The function of SSU, setup, and feedback was introduced. The main mathematical models of roll gap profile and longitudinal strain difference are set up. Strip profile allocation strategy was researched according to the SSU system of a domestic 1 700 mm HSM. The SSU system was put into practical use and the measurement results showed that strip flatness variation and strip profile variation could be controlled in target scope.

关键词： SSU hot strip mill, shape strip profile flatness

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Enhanced Laser Cooling of Rare-Earth-Ion-Doped Glass Containing Nanometer-Sized Metallic Particles

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Communications in Theoretical Physics 2009年第3期51卷 570-574页

作者： JIA You-hua zhong Biao YIN Jian-Ping state key {2. of Precision Spectroscopy East China Normal University Shanghai 200062 China science College Shanghai Second Polytechnic University Shanghai 201209 China

The enhanced laser cooling performance of rare-earth-ions-doped glasses containing small particles is predicted. This is achieved by the enhancement of local field around rare earth ions, owing to the surface plasmon resonance of small metallic particles. The role of energy transfer between ions and the particle is theoretical discussed. Depending on the particle size and the ion emission quantum efficiency, the enhancement of the absorption and the fluorescence is predicted. Moreover, taking Yb^3＋-doped ZBLAN as example, the cooling power and heat-light converting efficiency are calculated. It is finally concluded that the absorption and the fluorescence are greatly enhanced in these composite materials, the cooling power is increased compared to the bulk material.

关键词： rare-earth ions laser cooling of solids composite material Lorentz local-field correction plasma excitation

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Study of total variation diminishing (TVD) slope limiters in dam-break flow simulation

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Water science and Engineering 2018年第1期11卷 68-74页

作者： Feng-peng Bai zhong-hua Yang Wu-gang Zhou state key {2. of Water Resources and Hydropower Engineering science Wuhan University

A two-dimensional （2.） dam-break flow numerical model was developed based on the finite-volume total variation diminishing （TVD） and monotone upstream-centered scheme for conservation laws （MUSCL）-Hancock scheme, which has second-order accuracy in both time and space. A Harten-Lax-van Leer-contact （HLLC） approximate Riemann solver was used to evaluate fluxes. The TVD MUSCL-Hancock numerical scheme utilizes slope limiters, such as the minmod, double minmod, superbee, van Albada, and van Leer limiters, to prevent spurious oscillations and maintain monotonicity near discontinuities. A comparative study of the impact of various slope limiters on the accuracy of the numerical flow model was conducted with several dam-break examples including wet and dry bed cases. The numerical results of the superbee and double minmod limiters agree better with the theoretical solution and have higher accuracy than other limiters in one-dimensional （1D） space. The ratio of the downstream water depth to the upstream water depth was used to select the proper slope limiter. For the 2. numerical model, the superbee limiter should not be used, owing to significant numerical dispersion.

关键词： Dam-break flow TVD MUSCL-Hancock scheme Slope limiter Numerical accuracy Spurious oscillation

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高湿氢氧喷注器数值分析与正交设计

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浙江大学学报（工学版） 2015年第12期49卷 2403-2409页

作者：胡友瑞刘彦汪洋刘建忠周俊虎胡巍李洪伟浙江大学能源清洁利用国家重点实验室浙江杭州310027 浙江大学工业技术研究院浙江杭州310027 中国船舶重工集团公司第七〇五研究所陕西西安710075

采用基于数值模拟的正交实验优化设计方法对应用于氢氧蒸汽发生器的高湿氢氧同轴剪切喷注器进行研究,分析燃烧室流场、温度场和组分分布情况.以燃烧长度作为燃烧性能评价指标,以燃烧室壁面平均温度作为壁面热负荷的评价指标,研究氧气喷... 详细信息

采用基于数值模拟的正交实验优化设计方法对应用于氢氧蒸汽发生器的高湿氢氧同轴剪切喷注器进行研究,分析燃烧室流场、温度场和组分分布情况.以燃烧长度作为燃烧性能评价指标,以燃烧室壁面平均温度作为壁面热负荷的评价指标,研究氧气喷注速度（2.~40m/s）、高湿氢氧速度比（3~7）和氧喷嘴端面厚度（0.5~1.5mm）对高湿氢氧燃烧器燃烧性能和燃烧室壁面热负荷的影响.结果表明：燃烧室头部存在利于点火和维持稳定燃烧的回流区,高湿氢气和氧气射流之间存在高温剪切燃烧层.高湿氢氧速度比对燃烧性能和燃烧室壁面热负荷的影响最为显著,氧喷注速度次之;而氧喷嘴端面厚度影响对燃烧性能和燃烧室壁面热负荷的影响均不明显.增大氧气喷注速度和速度比会缩短燃烧长度,提高燃烧性能,但同时增大燃烧室壁面热负荷.高湿氢氧速度比和氧气喷注速度的交互作用对燃烧性能、燃烧室壁面热负荷的影响显著,其他参数交互作用产生的影响都非常小.在所研究的工况范围内,最短燃烧室长度为68mm,最低壁面温度燃气温度为1 966.9K.

关键词：氢氧蒸汽发生器高湿氢氧燃烧同轴剪切喷注器数值模拟正交优化设计

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Nonresonant and Resonant Nonlinear Absorption of CdSe-Based Nanoplatelets

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Chinese Physics Letters 2017年第9期34卷 112-116页

作者： Li-Bo Fang Wei Pan Si-hua zhong Wen-zhong Shen laboratory of Condensed Matter Spectroscopy and Opto-E1ectronic Physics and Key Laboratory of Artilicial Structures and Quantum Control (Ministry of Education) School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240

We present a comprehensive understanding of the nonHneer absorption characteristics of CdSe- based nanoplatelets （NPLs） synthesized by the solution-phase method and the colloidal atomic layer deposition approach through Z- scan techniques at 532.m with picosecond pulses. The CdSe NPLs exhibit strong two-photon induced free carrier absorption （effective three-photon absorption） upon the nonresonant excitation, resulting in a remarkable optical limiting behavior with the limiting threshold of approximately 75 GW/cm2. A nonlinear optical switching from saturable absorption （SA） to reverse saturable absorption （RSA） with increasing the laser intensity is observed when coating CdSe NPLs with a monolayer of CdS shell to realize the resonant absorption. The SA behavior originates from the ground state bleaching and the RSA behavior is attributed to the free carrier absorption. These findings explicitly demonstrate the potential applications of CdSe-based NPLs in nonlinear optoelectronics such as optical limiting devices, optical pulse compressors and optical switching devices.

关键词： Nonresonant and Resonant Nonlinear Absorption of CdSe-Based Nanoplatelets

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Automated process parameters tuning for an injection moulding machine with soft computing

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Journal of Zhejiang university-science A(Applied Physics & Engineering) 2011年第3期12卷 201-206页

作者： Peng ZHAO Jian-zhong FU hua-min ZHOU Shu-biao CUI state key {2. of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China state key {2. of Material Processing and Die & Mould technology Huazhong University of Science and Technology Wuhan 430074 China

In injection moulding production,the tuning of the process parameters is a challenging job,which relies heavily on the experience of skilled *** this paper,taking into consideration operator assessment during moulding trials,a novel intelligent model for automated tuning of process parameters is *** consists of case based reasoning (CBR),empirical model (EM),and fuzzy logic (FL) *** and EM are used to imitate recall and intuitive thoughts of skilled operators,respectively,while FL is adopted to simulate the skilled operator optimization ***,CBR is used to set up the initial process *** CBR fails,EM is employed to calculate the initial ***,a moulding trial is performed using the initial *** FL is adopted to optimize these parameters and correct defects repeatedly until the moulded part is found to be *** on the above methodologies,intelligent software was developed and embedded in the controller of an injection moulding *** results show that the intelligent software can be effectively used in practical production,and it greatly reduces the dependence on the experience of the operators.

关键词： Injection moulding machine (IMM) Process parameters Case based reasoning (CBR) Empirical model (EM) Fuzzy logic (FL)

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煤粉富氧燃烧着火模式判断和动力学参数分析

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浙江大学学报（工学版） 2012年第3期46卷 482-488,541页

作者：周志军姜旭东周俊虎刘建忠岑可法浙江大学能源清洁利用国家重点实验室浙江杭州310027

为了能够更深入地了解煤粉在富氧气氛下的燃烧机理,尤其是煤粉富氧着火模式的判断,在热重分析仪上,模拟了不同氧气体积分数下的煤粉富氧燃烧过程.选取5个不同的氧气体积分数:2.%、40%、60%、80%和100%,并且模拟了2.气氛下(N2.O2.CO2.O2...

为了能够更深入地了解煤粉在富氧气氛下的燃烧机理,尤其是煤粉富氧着火模式的判断,在热重分析仪上,模拟了不同氧气体积分数下的煤粉富氧燃烧过程.选取5个不同的氧气体积分数:2.%、40%、60%、80%和100%,并且模拟了2.气氛下(N2.O2.CO2.O2.和不同颗粒大小的煤粉的富氧燃烧过程.并根据普适积分法,计算了煤粉的活化能和指前因子.提出了一种根据TG-DTG曲线判断煤粉着火模式的新方法,它使得煤粉着火模式的判断更为准确.研究发现,在CO2.O2.氛下的富氧燃烧过程中,当煤粉粒径小于40μm时,煤粉发生非均相着火;当煤粉粒径大于2.0μm时,煤粉发生均相着火.大颗粒比小颗粒受氧气体积分数变化的影响要大.

关键词：热重分析着火模式煤粉富氧燃烧活化能

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Migration and transformation of Sb are affected by Mn(Ⅲ/Ⅳ)associated with lepidocrocite originating from Fe(Ⅱ)oxidation

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Journal of Environmental sciences 2022年第5期34卷 308-318页

作者： Yalu Shao Qian Sun Liangkai Wang Weiyong Zhan Hongwei Zhang hua zhong state key {2. of Water Resources and Hydropower Engineering science Wuhan UniversityWuhan 430072China School of Agriculture and Food The University of MelbourneVictoria 3010Australia College of Agricultural sciences and Engineering Hohai UniversityNanjing 210098China

Antimony(Sb)is a recognized priority pollutant with toxicity that is influenced by its mi-gration and transformation *** of Fe(Ⅱ)to Fe(Ⅲ)oxides,which is a com-mon phenomenon in the environment,is often accompanied by the formation of Mn(Ⅲ/Ⅳ)and might affect the fate of *** this study,incorporated Mn(Ⅲ)and sorbed/precipitated Mn(Ⅲ/Ⅳ)associated with lepidocrocite were prepared by adding Mn(Ⅱ)during and after Fe(Ⅱ)oxidation,respectively,and the effects of these Mn species on Sb fate were *** results indicated that the association of these Mn species with lepidocrocite obviously enhanced Sb(Ⅲ)oxidation to Sb(V),while concomitantly inhibiting Sb sorption due to the lower sorption capacity of lepidocrocite for Sb(V)than Sb(Ⅲ).Additionally,Mn oxide equivalents increased in the presence of Sb,indicating that Sb oxidation by Mn(Ⅲ/Ⅳ)associated with lepidocrocite was a continuous recycling process in which Mn(Ⅱ)released from Mn(Ⅲ/Ⅳ)reduction by Sb(Ⅲ)could be oxidized to Mn(Ⅲ/Ⅳ)*** recycling pro-cess was favorable for effective Sb(Ⅲ)***,Sb(Ⅴ)generated from Sb(Ⅲ)ox-idation by Mn(Ⅲ/Ⅳ)enhanced Mn(Ⅱ)sorption at the beginning of the process,and thus favored Mn(Ⅲ/Ⅳ)formation,which could further promote Sb(Ⅲ)oxidation to Sb(V).Over-all,this study elucidated the effects of Mn(Ⅲ/Ⅳ)associated with lepidocrocite arisen from Fe(Ⅱ)oxidation on Sb migration and transformation and revealed the underlying reaction mechanisms,contributing to a better understanding of the geochemical dynamics of Sb.

关键词： Antimony Manganese Lepidocrocite Sorption Oxidation

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