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Antibonding orbital tailor and stress relief engineering for FeS_(2)complex toward superior sodium storage

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Rare Metals 2024年第10期43卷 5048-5059页

作者： You-Bin Zhang zhen-guo Qi Fu-Sheng Liu guo-Hui Qin State Key Laboratory Base for Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Shandong Synergetic Innovation Center of Ecological and Chemical Engineering Qingdao 266042China

The sluggish kinetics behaviors and vast volume variations of Na^(+)hosts to FeS_(2)anode involved intercalation,and conversion reactions plague its applicability of sodium-ion batteries(SIBs).Here,a significantly expedited kinetics via cation intercalation and considerably relieved stress accumulation by constructing the concave scaffold protector are approached for FeS_(2)*** Mn^(2+)intercalation into FeS_(2),a new stable Mn-FeS_(2)was generated with distorted coordination;elevated antibonding orbital occupancy and lowed d band center to the release of more free Na^(+)were achieved,which was further encapsulated by hollow bowl-like carbon spheres(BC)This cation intercalation and concave morphology strategies confer Mn-FeS_(2)@BC significantly enhanced electron ion transport kinetics via reversed electron transfer to FeS_(2)fast desolvation kinetics,and evidently depressed structural deformation during Na^(+)insertion and ***,Mn-FeS_(2)@BC delivers the longevity and stable Na^(+)storage capacity in both half and full cell ***,Mn-FeS_(2)@BC also displays excellen adaptability in a wider temperature *** work proposes new views into the deep regulation of electrochemical performance of transition metal anodes via intercalation chemistry and concave engineering.

关键词： FeS_(2) Intercalation chemistry Concave engineering Sodium capture

Adaptive triangular mesh coarsening with centroidal Voronoi tessellations

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 535-545页

作者： zhen-yu SHU guo-zhao WANG Chen-shi DONG Institute of Computer Graphics and lmage Processing Department of Mathematics Zhejiang University Hangzhou 310027 China Laboratory of Information and Optimization Technologies Ningbo Institute of Technology Zhejiang University Ningbo 315100 China

We present a novel algorithm for adaptive triangular mesh coarsening. The algorithm has two stages. First, the input triangular mesh is refined by iteratively applying the adaptive subdivision operator that performs a so-called red-green split. Second, the refined mesh is simplified by a clustering algorithm based on centroidal Voronoi tessellations (CVTs). The accuracy and good quality of the output triangular mesh are achieved by combining adaptive subdivision and the CVTs technique. Test results showed the mesh coarsening scheme to be robust and effective. Examples are shown that validate the method.

关键词： Triangular mesh Mesh coarsening Surface subdivision Centroidal Voronoi tessellations (CVTs)

Hot deformation behavior and process parameter optimization of Ti22Al25Nb using processing map

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Rare Metals 2016年第1期35卷 118-126页

作者： Jing-Li Zhang Hong-zhen guo Hou-Quan Liang School of Materials Science and Engineering Northwestern Polytechnical University

The hot deformation behavior of Ti22A125 Nb was investigated by hot compression *** flow stressstrain curves can be divided into two types：conventional dynamic recrystallization（DRX） and discontinuous *** different softening mechanism and micro structure observation of conventional DRX and discontinuous DRX were *** processing map（PM） of Ti22A125 Nb was built to predict the safe deformation *** optimal low strain rate domain（DOM I） with high power dissipation efficiency indicates the complete ***,in the high strain rate and low-temperature domain（DOM Ⅲ）,the power dissipation efficiency is low and some adiabatic shear bands and glide bands are observed,which are unsafe and should be ***,the DRX map was *** DOM I,it reveals low dislocation density and high DRX content,which is in agreement with PM.

关键词： Ti22Al25Nb Intermetallic Processing map Hot deformation behavior Microstructure

Review:Research progress on Fabry-Perot resonator antenna

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 583-588页

作者： zhen-guo LIU Zhi-chen GE Xi-yuan CHEN State Key Lab of Millimeter Waves Southeast University Nanjing 210096 China zhenjiang Entry-Exit Inspection and Quarantine Bureau Zhenjiang 212003 China Department of lnstrument Science and Engineering Southeast University Nanjing 210096 China

The Fabry-Perot resonator (FPR) antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest. In this paper, a summary of planar and cylindrical structures, analytic models and research development is presented, and a comparison between these structures and analytic models is made, showing that such analytic models as the FP cavity mode, electromagnetic band gap (EBG) defect mode, transmission line mode, and leaky-wave mode are consistent when applied to analyze this type of resonator antenna. Some interesting topics under recent research, including dual or multi-band, improvement of gain bandwidth, low profile and beam control, are surveyed.

关键词： Fabry-Perot resonator (FPR) antenna Electromagnetic band gap (EBG) resonator antenna Leaky-wave antenna Defect mode Artificial magnetic conductor (AMC) Frequency selective surface (FSS)

Integrated Entry Guidance for Reusable Launch Vehicle

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Chinese Journal of Aeronautics 2007年第1期20卷 1-8页

作者： NING guo-dong ZHANG Shu-guang FANG zhen-ping School of Aeronautical Science and Technology Beijing University of Aeronautics and Astronautics Beijing 100083 China

A method for the implementation of integrated three-degree-of-freedom constrained entry guidance for reusable launch vehicle is presented. Given any feasible entry conditions, terminal area energy management interface conditions, and the reference trajectory generated onboard then, the method can generate a longitudinal guidance profile rapidly, featuring linear quadratic regular method and a proportional-integral-derivative tracking law with time-varying gains, which satisfies all the entry corridor constraints and meets the requirements with high precision. Afterwards, by utilizing special features of crossrange parameter, establishing bank-reversal corridor, and determining bank-reversals according to dynamically adjusted method, the algorithm enables the lateral entry guidance system to fly a wide range of missions and provides reliable and good performance in the presence of significant aerodynamic modeling uncertainty. Fast trajectory guidance profiles and simulations with a reusable launch vehicle model for various missions and aerodynamic uncertainties are presented to demonstrate the capacity and reliability of this method.

关键词： guidance trajectory generation entry onboard constraint robustness

Global Weak Solutions to a Fluid-particle System of an Incompressible Non-Newtonian Fluid and the Vlasov Equation

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Acta Mathematicae Applicatae Sinica 2024年第4期40卷 954-978页

作者： Pei-yu ZHANG Li FANG zhen-hua guo Department of Mathematics Northwest UniversityXi’an 710127China School of Mathematics and Information Science&Center for Applied Mathematics of Guangxi Guangxi UniversityNanning 530004China

The purpose of this work is to investigate the existence and uniqueness of weak solutions to the initial-boundary value problem for a coupled system of an incompressible non-Newtonian fluid and the Vlasov *** coupling arises from the acceleration in the Vlasov equation and the drag force in the incompressible viscous non-Newtonian fluid with the stress tensor of a power-law structure for p≥11/*** main idea of the existence analysis is to reformulate the coupled system by means of a so-called truncation *** advantage of the new formulation is to control the external force term G=-∫Rd(u-v)fdc(d=2,3).The global existence of weak solutions to the reformulated system is shown by using the Faedo-Galerkin method and weak compactness *** further prove the uniqueness of weak solutions to the considered system.

关键词： incompressible non-Newtonian fluid Vlasov equation global weak solutions

Addition of the T5 exonuclease increases the prime editing efficiency in plants

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Journal of Genetics and Genomics 2023年第8期50卷 582-588页

作者： zhen Liang Yuqing Wu Yingjie guo Sha Wei School of Life Science Shanxi UniversityTaiyuanShanxi 030006China Research Institute of Big Data Science and Industry Shanxi UniversityTaiyuanShanxi 030006China

Prime editing(PE)is a versatile genome editing tool without the need for double-stranded DNA breaks or donor DNA templates,but is limited by low editing *** previously fused the M-MLV reverse transcriptase to the Cas9 nickase,generating the PE2(v1)system,but the editing efficiency of this system is still *** we develop different versions of PE2 by adding the 50-to-30 exonuclease at different positions of the nCas9-M-MLV RT fusion ***2(v2),in which the T5 exonuclease fused to the N-terminus of the nCas9-MMLV fusion protein enhances prime editing efficiency of base substitutions,deletions,and insertions at several genomic sites by 1.7-to 2.9-fold in plant cells compared to PE2(v1).The improved editing efficiency of PE2(v2)is further confirmed by generating increased heritable prime edits in stable transgenic plants compared to the previously established PE-P1,PE-P2,and PPE *** PE2(v2),we generate herbicide-resistant rice by simultaneously introducing mutations causing amino acid substitutions at two target *** PE efficiency is further improved by combining PE2(v2)and *** together,the increased genome editing efficiency of PE2(v2)developed in this study may enhance the applications of PE in plants.

关键词： Prime editing CRISPR T5 exonuclease Genome editing

Stacking of Exfoliated Two-Dimensional Materials: A Review

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Chinese Journal of Chemistry 2020年第9期38卷 981-995页

作者： zhen Hu Zhi-Bo Liu Jian-guo Tian The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducotionTEDA Applied Physics Institute ond School of PhysicsNankai University Tianjin 300071China Renewable Energy Conversion and Storage Center Nankai UniversityTionjin 300384China

In recent years,two-dimensfonal(2D)atomic crystals represented by graphene have opened up new fields of 2D *** materials with atomic layer thickness are self-assembled into van der Waals heterostructures by weak van der Waals forces without considering lattice *** der Waals heterostructures can not only enhance the performance of its constituent materials but also show new ***-quality heterostructures require mechanically cleaved intrinsic 2D materials and flexible 2D material stacking ***,we summarize in detail the reliable exfoliation methods for large-area single-layer 2D materials and the dry and wet stacking techniques with high success *** twisted bilayer graphene is used as an example to briefly introduce the single-crystal tearing method,which is currently the most practical method for preparing isotropic twisted heterostructures with high-precision rotation *** hope to provide a valuable reference for researchers of 2D materials.

关键词： twisted preparing method

Locating the Source Regions of the Single and Double-Frequency Microseisms to Investigate the Source Effects on HVSR in Site Effect Analysis

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Journal of Earth Science 2022年第5期33卷 1219-1232页

作者： zhen guo Mei Xue Adnan Aydin Yu Huang State Key Laboratory of Marine Geology Tongji UniversityShanghai200092China College of Civil Engineering Tongji UniversityShanghai200092China Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education Tongji UniversityShanghai200092China Shanghai Sheshan National Geophysical Observatory Shanghai201602China Department of Geology and Geological Engineering University of MississippiOxfordMS38677USA

Evaluating the seismic site effect by the ambient noise based horizontal-to-vertical spectral ratio(HVSR)method is strongly affected by the spatial and temporal variations of the ambient noise ***,it is necessary to locate the source regions of ambient noise and investigate the relationships between the source energy and HVSR values at the predominant frequency(HVSRf_(0))of the *** generation mechanisms of the single-and double-frequency microseisms(SFMs,0.05-0.085 Hz and DFMs,0.1-0.5 Hz)in ambient noise are better understood than the noise in other frequency bands and they are dominantly composed of fundamental Rayleigh(Rg)*** this advantage,the recordings of SFMs and DFMs at 30 stations in the east coast region of the United States are used to demonstrate a study on locating their source regions with reasonable certainty and constructing the functional relationship between the HVSRf_(0) and the source energy of SFMs and *** recordings are processed in four sub-frequency bands(Fs)of SF and DF bands and a polarization analysis is carried out to select the ellipsoids approximating the particle motions of Rg *** the probability density functions of the back azimuths of the ellipsoids’semi-major axes are computed for each F and station,and are projected on the ocean to determine their possible source *** regions are further constrained by(1)the correlation coefficients between the SFMs and the WAVEWATCHⅢ(WWⅢ)hindcasts of ocean wave spectra in the SF band,or between the DFMs and the modeled DF energy on ocean surface in the selected time windows in the DF band,(2)the energy contribution defined by(i)the average WWⅢocean wave energy and the ocean bottom topographical gradient in the SF band,or(ii)the average modeled DF energy on ocean surface and a frequency and water depth dependent coefficient measuring the conversion efficiency of DF energy from water to solid earth in the DF band,and(3)the percentile retained energy of

关键词： seismic site effect HVSR single-frequency microseisms double-frequency microseisms polarization analysis geophysics

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