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Largest signless Laplacian spectral radius of uniform supertrees with diameter and pendent edges(vertices)

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Frontiers of Mathematics in China 2020年第6期15卷 1105-1120页

作者： Cunxiang DUAn Ligong wang peng XIAO School of Mathematics and Statistics Northwestern Polytechnical UniversityXi’an 710129China Xi’an-Budapest joint Research Center for Combinatorics Northwestern Polytechnical UniversityXi’an 710129China College of Arts and Sciences Shaanxi University of Science and TechnologyXi'an 710021China

Let S(m,d,k)be the set of k-uniform supertrees with m edges and diameter d,and S1(m,d,k)be the k-uniform supertree obtained from a loose path u_(1),e_(1),u_(2),e_(2),...,u_(d),e_(d),u_(d+1),with length d by attaching m-d edges at vertex u_[d/2]+*** this paper,we mainly determine S1(m,d,k)with the largest signless Laplacian spectral radius in S(m,d,k)for 3≤d≤*** also determine the supertree with the second largest signless Laplacian spectral radius in S(m,3,k).Furthermore,we determine the unique/c-uniform supertree with the largest signless Laplacian spectral radius among all fc-uniform supertrees with n vertices and pendent edges(vertices).

关键词： Signless Laplacian spectral radius supertree hypertree diameter pendent edges pendent vertices

Converting LinO_(3)additive to single nitrogenous component Li_(2)n_(2)O_(2)SEI layer on Li metal anode in carbonate-based electrolyte

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Chinese Chemical Letters 2024年第9期35卷 452-457页

作者： Kunyao peng Xianbin wang Xingbin Yan Department of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies Guangzhou 510275China

With the increasing demand for high energy density energy storage device,Li metal has received intensive attention for its ultrahigh capacity and the lowest redox ***_(3)is widely used as electrolyte additive for ether electrolyte,which can improve the cycle performance of Li metal *** to ethers,carbonates are more suitable for Li metal batteries with high voltage cathode because they have a wider electrochemical ***,LinO_(3)performs poor solubility in carbonate electrolyte,restricting its application in high voltage Li ***,we presented a facile method to introduce abundant LinO_(3)additive to carbonate electrolyte system by introducing LinO_(3)-PAn es as the interlayer of the ***_(3)-PAn es is in sufficient contact with the electrolyte so that it can continuously releases LinO_(3)to assist the formation of Li_(2)n_(2)O_(2)-rich single nitrogenous component SEI layer on Li *** the help of LinO_(3)-PAn es,Li metal anode shows excellent cycle stability even at a high current density of 4mA/cm^(2),so that the cycle performance of the full cells was significantly improved,whether in the anode-free Cu||LFP cell or the Li||nCM622 cell.

关键词： Li metal anode Electrolyte additive Lithium nitrate Solid electrolyte interphase Carbonate electrolyte

Removing lignin model pollutants with BiFeO_3–g-C_3n_4 compound as an efficient visible-light-heterogeneous Fenton-like catalyst

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journal of Environmental Sciences 2016年第10期28卷 218-229页

作者： j.njian An Guangyan Zhang Rongfeng Zheng peng wang School of Pulp and Paper Engineering Hubei Provincial Key Laboratory of Green Materials for Light Industry Hubei University of Technology

BiFeO3-g-C3n4 nanoscaled composite was prepared with a hydrothermal method and evaluated as a highly efficient photo-Fenton like catalyst under visible light irradiation. The BiFeO3-g-CHn4 composite exhibited much stronger adsorption ability to lignin model pollutant （guaiacol） than that of BiFeO3, which may be due to the higher specific surface area （BiFeO3-g-C3n4：35.59 m2/g 〉 BiFeO3：7.42 m2/g） and the adsorption form of π-π stack between g-C3n4 and guaiacol. The composite exhibited excellent visible light-Fenton like catalysis activity, being influenced by the solution pH value and the proportions of BiFe03 and g-C3n4 nanosheets. Under optimal conditions with visible light irradiation, the BiFeO3- g-C3n4 composite yielded fast degradation of guaiacol with an apparent rate constant of 0.0452 rain-I, which were 5.21 and 6.80 folds of that achieved by using BiFeO3 and the mixture of BiFeO3 and g-C3n4 nanosheets, respectively. The significantly enhanced visible light-Fenton like catalytic properties of the BiFeO3-g-C3n4 composite in comparison with that of BiFeO3 was attributed to a large surface area, much increased adsorption capacity and the semiconductor coupling effect between BiFe03 and g-C3n4 in the composite.

关键词： BiFeO3g-C3n4 nanosheetsHeterogeneous Fenton-like catalysisVisible light catalystDegradation

Two-dimensional materials for synaptic electronics and neuromorphic systems

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Science Bulletin 2019年第15期64卷 1056-1066页

作者： Shuiyuan wang David Wei Zhang peng Zhou State Key Laboratory of ASIC and System School of Microelectronics Fudan University

Synapses in biology provide a variety of functions for the neural system. Artificial synaptic electronics that mimic the biological neuron functions are basic building blocks and developing novel artificial synapses is essential for neuromorphic computation. Inspired by the unique features of biological synapses that the basic connection components of the nervous system and the parallelism, low power consumption, fault tolerance, self-learning and robustness of biological neural systems, artificial synaptic electronics and neuromorphic systems have the potential to overcome the traditional von neumann bottleneck and create a new paradigm for dealing with complex problems such as pattern recognition, image classification, decision making and associative learning. nowadays, two-dimensional(2 D) materials have drawn great attention in simulating synaptic dynamic plasticity and neuromorphic computing with their unique properties. Here we describe the basic concepts of bio-synaptic plasticity and learning, the 2 D materials library and its preparation. We review recent advances in synaptic electronics and artificial neuromorphic systems based on 2 D materials and provide our perspective in utilizing 2 D materials to implement synaptic electronics and neuromorphic systems in hardware.

关键词： Artificial synaptic electronics neuromorphic computation 2D materials Synaptic plasticity Hebbian learning

CO2 sequestration characteristics in the cementitious material based on gangue backfilling mining method

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International journal of Mining Science and Technology 2019年第5期29卷 721-729页

作者： peng wang Xianbiao Mao Shen-En Chen School of Mechanics and Civil Engineering China University of Mining&TechnologyXuzhou 221116China School of Civil and Environmental Engineering University of North Carolina at CharlotteCharlotteNC 28262USA

The increasing anthropogenic CO2 emission and global warming has challenged the China and other countries to seek new and better ways to meet the world’s increasing need for energy while reducing greenhouse gas *** overall proposition of this research is to develop a brand-new CO2 physical and chemical sequestration method by using solid waste of coal mining and cementitious material which are widely used for goaf backfilling in coal *** research developed a new testing system(constant temperature pressurized reaction chamber(CTPRC))to study the effects of different initial parameters on mineral carbonation such as different initial water-binder ratio,initial sample porosity and initial carbon dioxide *** experimental results show that the CO2 consumption ratio is 15%,10%and 7%higher with relatively high initial water-binder ratio,initial sample porosity and initial CO2 pressure within 48 *** addition,some physical and chemical evidence was found through the electron microscope scanning and XRD test to further explain the above test *** proposed research will provide critical parameters for optimizing CO2 sequestration capacity in this cementitious backfilling material with forming agent.

关键词： Gangue backfilling Goaf Carbon dioxide sequestration Mineral carbonation Cementious material

Uncovering the Mechanism for Urea Electrochemical Synthesis by Coupling n2 and CO_(2) on Mo2C-MXene

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Chinese journal of Structural Chemistry 2022年第9期41卷 94-104页

作者： jiahe peng Xiao wang Zheng wang Bin Liu peng Zhang Xin Li neng Li State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Shenzhen Research Institute of Wuhan University of Technology Shenzhen 518000China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China State Center for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China

In this work, the catalytic activities of MoC-MXene for the co-synthesis of urea from nand COare reported by well-defined density functional theory(DFT) method. The calculated results show that the presence of surface functional groups is not conducive to the CO/n(C/n) coupling process in urea synthesis reaction. The exposed MoC on the surface can realize urea synthesis at the limit point of 0.69 eV, but the large transition state energy barrier(1.50 eV)indicates that bare MoC is not a promising urea catalyst. Loading single atoms can improve the urea synthesis performance of bare MoC. The energy barrier of urea synthesis reaction and the transition state energy barrier of C/n coupling reaction have dropped significantly by the atomic loading of Fe and Ti on bare MoC. Moreover, Ti doped MoC exhibits better catalytic selectivity toward urea production, making it an excellent catalyst for urea synthesis. We hope this work can pave the way for the electrochemical synthesis of urea.

关键词： urea synthesis n2 and CO_(2)coupling electrocatalysis MXene DFT

Study of ATP borate ester effects on cell sensitization to radiation emitted by a nuclear reactor

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nuclear Science and Techniques 2020年第1期31卷 13-25页

作者： Miao wang Yong-peng Tong Qi Luo Shi-peng Hu College of Physics and Optoelectronic Engineering Shenzhen University

Adenosine triphosphate(ATP)borate ester as a new boron agent for boron neutron capture therapy was *** was synthesized via a dehydration reaction induced by heating adenosine triphosphate disodium with boric ***,ATP borate ester pretreatments were assessed to study their effects on cell sensitization from exposure to thermal neutron irradiation emitted by a nuclear *** cell viability assays(CCK8),survival rates of A549 cells pretreated with or without boroncontaining agents,including ATP borate ester and 4-dihydroxyborylphenylalanine(BPA),were *** week after feeding an ATP borate ester solution to tumorbearing nude mice,elemental B content values of tumor muscle and blood were measured using inductively coupled plasma mass spectrometry(ICP-MS).Meanwhile,other tumor tissue samples were placed in a culture medium,subjected to a 3-min neutron irradiation exposure,and then fixed in formalin 24 h later for the terminaldeoxynucleotidyl transferase(TDT)-mediated d UTP nick end labeling(TUnEL)immunohistochemical staining *** showed that A549 cell irradiation sensitization(irradiation dose of 0.33 Gy)varied with *** values of the ATP borate ester pretreatment group were 1.3–14.1 with boron agent concentrations of 0.3–4.5 *** 1.1–3.4 mM,ATP borate ester showed significantly higher sensitization values than ***,TUnEL results demonstrated that apoptosis rates of tumor tissue cells exposed to irradiation after ATP borate ester pretreatment significantly exceeded the corresponding rates for BPA-pretreated *** animal experiments,although the distribution ratio of ATP borate ester(tumor tissue/normal muscle,T/n)of 1.2 was not significantly different compared with that of BPA(1.3),the total ATP borate ester concentration in the tumor tissue(0.79±0.05μg/g)significantly exceeded that of BPA(0.58±0.05μg/g).Thus,compared with BPA,the greater enrichment of ATP borate ester in tumor tissues permits pre

关键词： ATP borate ester Boron agent neutron radiation Sensitizing effect A549 cell lines

An improved specimen preparation method for marine shallow gasbearing sand sediments and its validations

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journal of Rock Mechanics and Geotechnical Engineering 2021年第3期13卷 682-693页

作者： Yong wang Lingwei Kong Min wang Yanli wang peng Cheng State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China Fluid Dynamics and Solid Mechanics Theoretical DivisionLos Alamos National LaboratoryLos Alamos87545USA Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources Yangtze River Scientific Research InstituteWuhan430010China Hunan University Design Institute Co. Ltd.Changsha410082China

Instabilities of shallow gas-charged seabed are potential geological hazards in ocean *** practice,the conventional field sampling techniques failed to obtain undisturbed gas-bearing sediments from the seabed for laboratory mechanical testing because of sensitive gas exsolution and escape from ***,preparation of representative remoulded gas-charged specimens is a challenging issue,because it is rather difficult to quantitatively control the gas content and obtain uniform distribution of gas bubbles within the *** the above problems,this work proposes a reliable approach to reconstitute the high-saturation specimen of gas-charged sediments in the laboratory by an improved multifunction integrated triaxial apparatus(MITA).This apparatus is developed based on an advanced stress path triaxial system by introducing a temperature-controlled system and a wavemonitoring *** temperature-controlled system is used to accurately mimic the in situ environments of sediments in the *** wave-monitoring system is utilized to identify exsolution point of free gas and examine the disturbance of gas to specimens during gas *** detailed procedure of gassy specimen preparation is ***,the quality of prepared specimens using our improved apparatus is validated by the high-resolution micro-X-ray computed tomography(mCT)scanning test,from which bubble occurrence and size distribution within the gassy sand specimen can be obtained;and preliminary mechanical tests on gassy sand specimens with various initial saturation degrees are *** proposed specimen preparation procedure succeeds in proving the postulated occurrence state of gas bubbles in coarse-grained sediments and accurately controlling the gas content.

关键词： Shallow gas Gas-bearing sediments Bubbles Mechanical behaviour Bender element

Qualitative analysis on a diffusive prey-predator model with ratio-dependent functional response

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Science China Mathematics 2008年第11期51卷 2043-2058页

作者： peng Rui wang MingXin Institute of nonlinear Complex Systems College of ScienceChina Three Gorges UniversityYichang 443002China Department of Mathematics Southeast UniversityNanjing 210018China

In this paper, we investigate a prey-predator model with diffusion and ratio-dependent functional response subject to the homogeneous neumann boundary condition. Our main focuses are on the global behavior of the reaction-diffusion system and its corresponding steady-state problem. We first apply various Lyapunov functions to discuss the global stability of the unique positive constant steady-state. Then, for the steady-state system, we establish some a priori upper and lower estimates for positive steady-states, and derive several results for non-existence of positive non-constant steady-states if the diffusion rates are large or small.

关键词： a prey-predator model diffusion ratio-dependent steady-state global stability non-existence 35j55 37B25 92D25