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The pseudocapacitance mechanism of graphene/CoAl LDH and its derivatives:Are all the modifications beneficial?

Journal of Energy Chemistry 2021年第1期30卷 218-227,I0007页

作者： Chuan Jing xu dong liu Kailin Li Xiaoying liu Biqin dong Fan dong Yuxin Zhang State Key Laboratory of Mechanical Transmissions College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Research Centre of Laser Fusion China Academy of Engineering PhysicsMianyang 621900SichuanChina Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education Chongqing Key Laboratory of Catalysis and New Environmental MaterialsCollege of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering Shenzhen UniversityShenzhen 518060GuangdongChina Research Center for Environmental Science&Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731SichuanChina

Cobalt-Aluminum layered double hydroxide(CoAl LDH) is a hopeful electrode material due to the advantage of easy modifiability for preparing LDH-based ***,there is short of modification methods to prepare the Co-based derivatives from CoAl LDH and also short of an intuitive perspective to analyze the pseudocapacitance mechanism of CoAl LDH and its ***,Graphene/CoAl LDH and its derivatives including Graphene/CoS,Graphene/CoS-1,Graphene/CoOOH,Graphene/CoP were prepared by reasonably using alkali etching treatment,sulfofication and *** specific capacitance of Graphene/CoAl LDH,Graphene/CoS,Graphene/CoS-1,Graphene/CoOOH,Graphene/CoP at1 A g^(-1) are 260.7,371.3,440.8,61.4 and 122.2 F g^(-1),*** pseudocapacitance mechanism of Graphene/CoAl LDH and its derivatives was *** to the positive effect of sulfofication on the electrical conductivity of GO and cobalt sulfide,the Graphene/CoS and Graphene/CoS-1 exhibit the optimal electrochemical performance and superior rate *** addition,due to the repulsion effect between Graphene and OH-,the Graphene/CoAl LDH exhibits optimal cycling stability of 224.1% capacitance retention after 20000 ***,the reason of terrible specific capacitance of Graphene/CoOOH is that the presence of H bond in interlayer of CoOOH inhibits the interaction between Co3+ and ***,not all modifications will increase the specific capacitance of the electrode ***,this work provides us with a detailed analysis of the electrochemical mechanism and correlation of CoAl LDH and its derivatives from the perspective of crystal structure and composition.

关键词： CoAl LDH and its derivates Modification Pseudocapacitance mechanism Alkali etching treatment Sulfofication Phosphorization

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Landfill leachate production, quality and recirculation treatment in northeast China

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Journal of Environmental Sciences 2006年第4期18卷 625-628页

作者： ZHAO Qing-liang liu xue-yan QI xu-dong liu Zhi-gang School of Municipal and Environment Engineering Harbin Institute of Technology Harbin 150090 China

Landfill leachate recirculation treatment process is a promising and economic way in northeast China due to the distinct season variation. In order to study the impact of recirculation on leachate production and its quality, two simulated sanitary landfill reactors, one with leachate recirculation and the other without, were placed outdoor in Harbin. The two-year experimental results indicated that leachate production was reduced by 86% with leachate recirculation and less or no facility for leachate treatment required. Recirculation could improve the leachate quality dramatically with lower COD, SS, NF4-N and higher pH level. Recirculation also could enhance waste degradation and stabilization and improve the efficiency of landfill. This study confirmed that leachate recirculation was a very feasible way for on-site landfill leachate treatment in cold areas.

关键词： cold area sanitary landfill leachate recirculation solid waste

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Numerical simulation of PAHs sorption/desorption on soil with the influence of Tween80

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Journal of Environmental Sciences 2006年第4期18卷 716-720页

作者： CHEN Jing WANG xue-jun HUJun-dong xu Fu-liu TAO Shu College of Environmental Science MOE Laboratory of Earth Surface Process Peking University Beijing 100871 China

In this paper, the influences of inionic surfactant Tween80 on polycyclic aromatic hydrocarbons （PAHs） sorption/desorption on artificially contaminated soil were studied, and γ model was applied to simulate the influences. Results showed that, with the use of Tween 80, the sorption behaviors of PAHs on soil altered significantly. Adsorbed Tween 80 increased the sorption amount of PAHs while the dissolved Tween80 increased the apparent solubility of PAHs. These two processes exert influences on the sorption coefficient of PAHs in soil-water system, which can be depicted by apparent sorption coefficient. The partition coefficients （the soil/water partition coefficient of PAHs and surfactants obtained fxom sorption experiments） and statistical parameters used in the amended γ model were obtained in independent experiments. With these parameters, the γ model could provide a satisfactory independent prediction of PAHs release from soil to aqueous phase at two surfactant concentrations.

关键词： Tween80 PAHs soil sorption/desorption γ model

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Numerical simulation of melt flow and temperature field during DC casting 2024 aluminium alloy under different casting conditions

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China Foundry 2024年第4期21卷 387-396页

作者： Jin-chuan Wang Yu-bo Zuo Qing-feng Zhu Jing Li Rui Wang xu-dong liu Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationShenyang 110819China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Casting speed,casting temperature and secondary cooling water flow rate are the main process parameters affecting the DC casting *** parameters significantly influence the flow and temperature fields during casting,which are crucial for the quality of the ingot and can determine the success or failure of the casting *** simulation,with the advantages of low cost,rapid execution,and visualized results,is an important method to study and optimize the DC casting *** the present work,a simulation model of DC casting 2024 aluminum alloy was established,and the reliability of the model was ***,the influence of casting parameters on flow field and temperature field was studied in detail by numerical simulation *** show that with the increase of casting speed,the melt flow becomes faster,the depths of slurry zone and mushy zone increase,and the variation of slurry zone depth is greater than that of mushy *** an increase in casting temperature,the melt flow rate increases,the depth of the slurry zone becomes shallower,and the depth of the mushy zone experiences only minor *** simulation results further indicate that the increase of the flow rate of the secondary cooling water slightly reduces the depths of both slurry and mushy zone.

关键词： aluminium DC casting flow field temperature field numerical simulation

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Establishment of reference mandibular plane for anterior alveolar morphology evaluation using cone beam computed tomography

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第11期13卷 942-947页

作者： Rong-yang WANG Min HAN Hong liu Chun-ling WANG Hong-hong XIAN Lei ZHANG Shi-jie ZHANG dong-xu liu Department of Orthodontics Shandong Provincial Key Laboratory of Oral Biomedicine Shandong University Jinan 250012 China Department of Stomatology Qianfoshan Hospital of Shandong Province Jinan 250014 China Department of Stomatology the Second Hospital of Shandong Uni- versity Jinan 250033 China

To propose a method of establishing the reference mandibular plane (MP), which could be reestablished according to the coordinates of the reference points, and then facilitate the assessment of anterior alveolar morphology using cone beam computed tomography (CBCT), sixty patients with bimaxillary protrusion were randomly selected and CBCT scans were taken. The CBCT scans were transferred to Materialism's interactive medical image control system 10.01 (MIMICS 10.01), and three dimensional models of the entire jaws were constructed. Reference points determining the reference MP were positioned in the coronal, axial, sagittal windows, and the points were exactly located by recording their coordinates in the interfaces of software. The reference MP provided high intra-observer reliability(Pearson's r 0.992 to 0.999), and inter-observer reliability (intra-class correlation coefficients (ICCs) 0.996 to 0.999).

关键词： Reference Plane Cone beam computed tomography Alveolar morphology

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Analysis of pseudo-random number generators in QMC-SSE method

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Chinese Physics B 2024年第3期33卷 75-79页

作者：刘东旭徐维张学锋 Department of Physics Chongqing UniversityChongqing 401331China

In the quantum Monte Carlo(QMC)method,the pseudo-random number generator(PRNG)plays a crucial role in determining the computation ***,the hidden structure of the PRNG may lead to serious issues such as the breakdown of the Markov ***,we systematically analyze the performance of different PRNGs on the widely used QMC method known as the stochastic series expansion(SSE)*** quantitatively compare them,we introduce a quantity called QMC efficiency that can effectively reflect the efficiency of the *** testing several representative observables of the Heisenberg model in one and two dimensions,we recommend the linear congruential generator as the best choice of *** work not only helps improve the performance of the SSE method but also sheds light on the other Markov-chain-based numerical algorithms.

关键词： stochastic series expansion quantum Monte Carlo pseudo-random number generator

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Three-dimensional evaluation of upper anterior alveolar bone dehiscence after incisor retraction and intrusion in adult patients with bimaxillary protrusion malocclusion

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第12期12卷 990-997页

作者： Qing-yuan GUO Shi-jie ZHANG Hong liu Chun-ling WANG Fu-lan WEI Tao LV Na-na WANG dong-xu liu Department of Orthodontics Shandong Provincial Key Laboratory of Oral Biomedicine Shandong University Jinan 250012 China Department of Stomatology the Second Hospital of Shandong University Jinan 250033 China

Objective:The purpose of this study was to evaluate three-dimensional(3D) dehiscence of upper anterior alveolar bone during incisor retraction and intrusion in adult patients with maximum ***:Twenty adult patients with bimaxillary dentoalveolar protrusion had the four first premolars *** were placed to provide maximum anchorage for upper incisor retraction and intrusion.A computed tomography(CT) scan was performed after placement of the miniscrews and *** 3D reconstructions of pre-and post-CT data were used to assess the dehiscence of upper anterior alveolar ***:The amounts of upper incisor retraction at the edge and apex were(7.64±1.68) and(3.91±2.10) mm,respectively,and(1.34±0.74) mm of upper central incisor *** alveolar bone height losses at labial alveolar ridge crest(LAC) and palatal alveolar ridge crest(PAC) were 0.543 and 2.612 mm,respectively,and the percentages were(6.49±3.54)% and(27.42±9.77)%,*** shape deformations of LAC-labial cortex bending point(LBP) and PAC-palatal cortex bending point(PBP) were(15.37±5.20)° and(6.43±3.27)°,***:Thus,for adult patients with bimaxillary protrusion,mechanobiological response of anterior alveolus should be taken into account during incisor retraction and *** of maximum anchorage might lead to upper anterior alveolar bone loss.

关键词： Alveolar bone loss Adult patients Computed tomography Three-dimensional registration

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Protein-based soft micro-optics fabricated by femtosecond laser direct writing

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Light(Science & Applications) 2014年第1期3卷 342-348页

作者： Yun-Lu Sun Wen-Fei dong Li-Gang Niu Tong Jiang dong-xu liu Lu Zhang Ying-Shuai Wang Qi-Dai Chen dong-Pyo Kim Hong-Bo Sun State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China College of Physics Jilin UniversityChangchun 130023China National Center of Applied Microfluidic Chemistry Department of Chemical EngineeringPohang University of Science and TechnologyPohang 790-784Korea

In this work,we report a novel soft diffractive micro-optics,called‘microscale kinoform phase-type lens(micro-KPL)’,which is fabricated by femtosecond laser direct writing(FsLDW)using bovine serum albumin(BSA)as building blocks and flexible polydimethylsiloxane(PDMS)slices as *** carefully optimizing various process parameters of FsLDW(e.g.,average laser power density,scanning step,exposure time on a single point and protein concentration),the as-formed protein micro-KPLs exhibit excellent surface quality,well-defined three-dimensional(3D)geometry and distinctive optical properties,even in relatively harsh operation environments(for instance,in strong acid or base).Laser shaping,imaging and other optical performances can be easily *** importantly,micro-KPLs also have unique flexible and stretchable properties as well as good biocompatibility and ***,such protein hydrogel-based micro-optics may have great potential applications,such as in flexible and stretchable photonics and optics,soft integrated optical microsystems and bioimplantable devices.

关键词： femtosecond laser direct writing micro-optics protein soft

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The Development of Hot Rolled Automobile Beam Steel Plates 500L-Z With Excellent Surface Oxide Layer

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Journal of Iron and Steel Research International 2011年第S1期18卷 999-1003页

作者： SHI Xiao-guang,HAN Bin,xu Xin,dong Yi,liu Ren-dong (An Gang Steel Co Ltd,Anshan 114001,Liaoning,China) An Gang Steel Co Ltd Anshan 114001 Liaoning Peoples R China

This paper has determined the compositions and hot rolling processes of the hot rolled beam steel plates with excellent surface oxide layer for automobiles by investigating the oxide layer forming principle and its influence factors,and the feature of the steel oxide *** microstructure,mechanical properties,oxide layer shape and structural composition of the steel plates are analyzed by using metallographic structures examination,SEM analyzing,X-ray diffraction instrument and mechanical properties *** result shows that the trial hot rolled frame steel plates have an excellent oxide layer adhesion,the Fe 3 O 4 proportions is greater than 85% in the oxide layer,and the oxide layer thickness is less than or equal to 10μ*** product has been trial-manufactured more than 100 thousands ton,and used to stamp the beam parts of automobiles straightly in no pickling *** oxide layer scarcely scales off from the steel plates,and the effect is remarkable.

关键词： automobile beam 500L-Z Fe 3 O 4 oxide layer

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Room-temperature hydrogen spillover achieving stoichiometric hydrogenation of NO_(3)^(-) and NO_(2)^(-) into N_(2) over CuPd nanowire network

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Rare Metals 2022年第3期41卷 851-858页

作者： Ruo-Yan Miao xue-Xiang Li Qian Lei Hu liu Zhen-Hui Ma xu-dong liu Zhou-Yang Yin Zuo-Bin Tang Liang Zhang Yu-Hong Tian School of Chemistry and Chemical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an 710072China Department of Physics Beijing Technology and Business UniversityBeijing 100048China Department of Chemistry University of VirginiaCharlottesvilleVA 22904USA

The development of an efficient hydrogen spillover (HS)catalyst achieves the stoichiometric chemoselective hydrogenation of NO_(3)^(-)and NO_(2)^(-)into N_(2) at room temperature,which is extremely ***,we report a Cu_(x)Pd_(1-x) nanowire network (NWN)(x=7,5,or 3) with tunable hydrogen spillover rate of formic acid (FA) with polyvinylpyrrolidine imine (PVPI) modifying its surface.

关键词： network hydrogen (3)

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