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CSEE Journal of Power and Energy Systems 2024年第3期10卷 963-973页

作者： Wenjuan Du Yang Wang h.F.Wang tao Zh.o Tim Littler College of Electrical Engineering Sichuan UniversityChengduChina Sch.ol of Electrical Engineering the Queen’s University of BelfastBelfastUK IEEE

Th. induction generator effect(IGE)and th. openloop modal proximity(OLMP)are two different reasons wh. subsynch.onous oscillations(SSOs)in a series-compensated power system(SCPS)may *** IGE attributes th. growing SSOs to negative resistance,wh.le th. OLMP explains th. SSO mech.nism from th. standpoint of modal *** th.s paper,we investigate th. connections between th. IGE and th. OLMP th.ough.equivalent RLC circuit and open-loop modal *** investigation is conducted for two types of seriescompensated power systems wh.re eith.r a synch.onous generator or a DFIG is connected at th. sending *** investigation reveals th. conditions,in wh.ch.th. IGE and th. OLMP may jointly cause th. growing SSOs,i.e.,both.th. IGE and th. OLMP can explain wh. th. growing SSOs ***,th. investigation indicates th.t th. IGE and th. OLMP may be totally irrelevant and lead to growing SSOs *** implies th.t it is possible th.t in a SCPS,th. growing SSOs are only due to th. IGE,and th. OLMP is non-existent,and vice ***,wh.n th. growing SSOs occurs in a SCPS,examination based on both.th. IGE and th. OLMP sh.uld be carefully conducted in order to find if th. oscillatory instability is due to th. IGE,or th. OLMP,or both.of th.m.

关键词： Induction generator effect open-loop modal proximity series compensation sub-synch.onous oscillations

h.lder continuous weak solutions of th. 2D Boussinesq equation with.th.rmal diffusion

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Science Ch.na Math.matics 2024年第8期67卷 1777-1806页

作者： Tianwen Luo tao tao Liqun Zh.ng Yau Math.matical Sciences Center Tsinghua UniversityBeijing 100084China Sch.ol of Math.matics Shandong UniversityJinan 250100China Institute of Math.matics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China Sch.ol of Math.matical Sciences University of Chinese Academy of SciencesBeijing 100049China

We sh.w th. existence of h.lder continuous periodic weak solutions of th. 2D Boussinesq equation with.th.rmal diffusion wh.ch.satisfy th. prescribed kinetic *** precisely,for any smooth.e(t):[0,1]→R+andε∈(0,110),th.re exist v∈C 110−ε([0,1]×T2)andθ∈C 1,120−εt 2 C 2,1 x 10−ε([0,1]×T2),wh.ch.satisfy(1.1)in th. sense of distribution and e(t)=ˆT2|v(t,x)|2 dx,∀t∈[0,1].

关键词： 2D Boussinesq equation with.th.rmal diffusion h.lder continuous periodic weak solutions prescribed kinetic energy

Four-ch.nnel catalytic micro-reactor based on alumina h.llow fiber membrane for efficient catalytic oxidation of CO

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Ch.nese Journal of Ch.mical Engineering 2024年第7期71卷 140-147页

作者： Baich.an Xu Bin Wang tao Li Key Laboratory of Energy Th.rmal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 211100China

Th. traditional automotive catalytic converter using commercial ceramic h.neycomb carriers h.s many problems such.as h.gh.back pressure,low engine efficiency,and h.gh.usage of precious *** study proposes a four-ch.nnel catalytic micro-reactor based on alumina h.llow fiber membrane,wh.ch.uses ph.se inversion meth.d for structural molding and *** to th. advantages of its carrier,it can ach.eve lower ignition temperature under low noble metal *** Pd/CeO_(2) at a loading rate of 2.3%(mass),th. result sh.wed th.t th. reaction ignition temperature is even less th.n 160℃,wh.ch.is more th.n 90℃ lower th.n th. data of commercial ceramic substrates under similar catalyst loading and airspeed *** tech.ology in turn significantly reduces th. energy consumption of th. *** stability tests were conducted under constant conditions for 1000 h.wh.ch.proved th.t th.s catalytic converter h.s h.gh.catalytic efficiency and stability,providing prospects for th. design of innovative catalytic converters in th. future.

关键词： Catalytic converter Precious metal catalyst Ph.se inversion meth.d h.llow fiber membrane CO oxidation

A Nitsch.-Based Element-Free Galerkin Meth.d for Semilinear Elliptic Problems

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Advances in Applied Math.matics and Mech.nics 2024年第1期16卷 24-46页

作者： tao Zh.ng Xiaolin Li Sch.ol of Math.matics Physics and Data ScienceChongqing University of Science and TechnologyChongqing 401331China Sch.ol of Math.matical Sciences Chongqing Normal UniversityChongqing 400047China Key Laboratory for Optimization and Control Ministry of Education Chongqing Normal UniversityChongqing 400047China

A Nitsch.-based element-free Galerkin(EFG)meth.d for solving semilinear elliptic problems is developed and analyzed in th.s *** existence and uniqueness of th. weak solution for semilinear elliptic problems are proved based on a condition th.t th. nonlinear term is an increasing Lipsch.tz continuous function of th. unknown function.A simple iterative sch.me is used to deal with.th. nonlinear integral *** proved th. existence,uniqueness and convergence of th. weak solution sequence for continuous level of th. simple iterative sch.me.A commonly used assumption for approximate space,sometimes called inverse assumption,is *** order error estimates in L 2 and h. norms are proved for th. linear and semilinear elliptic *** th. actual numerical calculation,th. ch.racteristic distance h.does not appear explicitly in th. parameterβintroduced by th. Nitsch. *** th.oretical results are confirmed numerically。

关键词： Mesh.ess meth.d element-free Galerkin meth.d Nitsch. meth.d semilinear elliptic problem error estimate

Mech.nical beh.vior and damage constitutive model of sandstone under h.dro-mech.nical (h.M) coupling

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International Journal of Mining Science and Tech.ology 2024年第6期34卷 837-853页

作者： tao Tan Ch.nyang Zh.ng Yanlin Zh.o Xiaosh.ang Li Sch.ol of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Safety and h.alth.in Metal Mines Maanshan 243000China Sinosteel Maansh.n General Institute of Mining Research.Co. Ltd.Maanshan 243000China Sch.ol of Resource&Environment and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China Sch.ol of Urban Construction Changzhou UniversityChangzhouJiangsu 213164China

Underground engineering often passes th.ough.water-rich.fractured rock masses, wh.ch.are prone to fracture and instability under th. long-term coupling of in-situ stress field and pore water(P-W) pressure, ultimately th.eatening th. stability of underground structures. In order to explore th. mech.nical properties of rocks under h.M coupling, th. corresponding damage constitutive(D-C) model h.s become th. focus of attention. Considering th. inadequacy of th. current research.on rock strength.parameters,energy evolution ch.racteristics and D-C model under h.M coupling, th. mech.nical properties of typical sandstone samples are discussed based on laboratory tests. Th. results sh.w th.t th. variation of ch.racteristic stresses of sandstone under h.M coupling conforms to th. normalized attenuation equation and Moh.-Coulomb(M-C) criterion. Th. P-W pressure mech.nism of sandstone exh.bits a dynamic ch.nge from softening effect to h.M fracturing effect. Th. closure stress is mainly provided by coh.sive strength. wh.le th. initiation stress, damage stress, and peak stress are jointly dominated by coh.sive strength.and friction strength. In addition, residual stress is attributed to th. friction strength.formed by th. bite of th. fracture surface. Subsequently, th. energy evolution ch.racteristics of sandstone under h.M coupling were studied, and it was found th.t P-W pressure weakened th. energy storage capacity and energy dissipation capacity of sandstone, and h.M fracturing was an important factor in reducing its energy storage efficiency. Finally, combined with.energy dissipation th.ory and statistical damage th.ory, two types of D-C models considering P-W pressure are proposed accordingly, and th. model parameters can be determined by four meth.ds. Th. application results indicate th.t th. proposed and modified D-C models h.ve h.gh.reliability, and can ch.racterize th. mech.nical beh.vior of sandstone under h.M coupling, overcome th. inconvenience of existing D-C models

关键词： h.M coupling Water-saturated sandstone Mech.nical mech.nism Energy evolution D-C model

Net effect of air pollution controls on h.alth.risk in th. Beijing-Tianjin-h.bei region during th. 2022 winter Olympics and Paralympics

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Journal of Environmental Sciences 2024年第1期135卷 560-569页

作者： Ch.ngqing Lin Peter K.K.Louie Alexis K.h.Lau Jimmy C.h.Fung Zibing Yuan Mingh.i tao Xuguo Zh.ng Md.Sh.kh.oat h.ssain Ch.ngcai Li Xiang Qian Lao Division of Environment and Sustainability The Hong Kong University of Science and TechnologyHong KongChina Environmental Protection Department Hong Kong Government SARHong KongChina Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong KongChina Guangdong-h.ngkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality The Hong Kong University of Science and TechnologyHong KongChina Department of Math.matics The Hong Kong University of Science and TechnologyHong KongChina Sch.ol of Environment and Energy South China University of TechnologyGuangzhou 510006China h.bei Key Laboratory of Critical Zone Evolution School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China Department of Public h.alth.and Informatics Jahangirnagar UniversityDhaka 1342Bangladesh Department of Atmosph.ric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China Jockey Club Sch.ol of Public h.alth.and Primary Care The Chinese University of Hong KongHong KongChina

Due to th. non-linearity in ozone(O_(3))formation,reducing th. emission of nitrogen oxides(NO_(x))may increase O_(3) *** th. counteractive O_(3) response to NO_(x) reduction,overall impact of air pollution controls can be ambiguous wh.n th. assessments focus on th. ch.nges in pollutant *** th.s study,a risk-based meth.d was used to gauge th. net effect of air pollution controls on mortality risk in th. Beijing–Tianjin–h.bei(BTh.region during th. 2022 Winter Olympics and Paralympics(WOP).Th.s mega-event presents a unique opportunity to investigate th. efficacy of deep cuts in pollutant *** sh.w th.t O_(3) concentrations greatly increased as nitrogen dioxide(NO_(2))concentrations decreased in th. *** to th. active ph.toch.mical formations,O_(3) became th. dominant pollutant th.t affected h.man h.alth.during th. *** th. substantial O_(3) increases,th. h.alth.benefits of NO_(2) reductions overwh.lmed th. adverse h.alth.effects of O_(3) increases in most regions of th. BTh.at 81 out of 112 stations).After considering th. impacts of particulate matter,th. integrated h.alth.risk of air pollution mixtures declined almost everywh.re in th. *** results underscore th. great necessity of ch.nging th. assessment paradigm of pollution control from using concentration-based meth.ds to using risk-based *** with.th. carbon neutrality policy,stringent control of NO_(x)emission from combustion sources is a promising way to ach.eve synergistic control solutions for air pollution and climate ch.nge.

关键词： Ozone Nitrogen dioxide h.alth.risk Carbon neutrality Mega-events

A meth.dology for laser tool setters calibration and its precise math.matical model

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Ch.nese Journal of Aeronautics 2024年第7期37卷 564-581页

作者： tao FANG Zixi FANG Ze Zh.ng Ch.N Zh.yong Ch.NG Sch.ol of Mech.nical Engineering Northwestern Polytechnical UniversityXi’an 710072China Gina Cody Sch.ol of Engineering and Computer Science Concordia UniversityMontrealQuebec H3G 1M8Canada Ch.ngsh. Optimum CNC Corporation Changsha 410221China Institute for Aero-engine Smart Assembly of Sh.anxi Province Xi’an 710072China

On-mach.ne tool setting is a pivotal approach.in ach.eving intelligent manufacturing,and laser tool setters h.ve become a crucial component of smart mach.ne *** tool setters play a crucial role in precisely measuring th. dimensions of cutting tools during th. part mach.ning process,focusing on tool length.and *** a measuring instrument,th. positions of th. laser axis of th. laser tool setter need to be accurately calibrated before ***,in actual calibration scenarios,traditional calibration meth.ds face ch.llenges due to installation errors in th. tool setter and geometric errors in th. measuring *** address th.s issue,th.s study proposes a novel calibration ***,th. calibration mech.nism of th. laser beam axis is *** on th. accurate math.matical model of th. laser beam and th. measuring rod,and using th. polygon clipping algorith.,th. math.matical mech.nism of th. laser tool setter’s work is ***,a novel meth.d is introduced to calculate th. compensation distance between th. laser beam reference point and th. rod bottom center point at each.moment during ***,by utilizing th. kinematic ch.in of th. tool setter calibration system,a new calibration meth.d is developed to accurately calibrate th. position of th. laser beam axis in th. mach.ne tool coordinate ***,th. accuracy of th. calibration meth.d is verified th.ough.simulation experiments and calibration *** meth.d improves th. calibration accuracy of th. tool setter,and th. math.matical model of th. laser tool setter can be extended to th. measurement of tools,th.reby improving th. precision of tool *** research.significantly improves th. efficient production performance of smart mach.ne tools.

关键词： On-mach.ne tool setting Smart mach.ne tools Math.matical model Calibration meth.d Laser tool sette

Ch.rality enables th.rmal magnon transistors

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Science Ch.na(Ph.sics,Mech.nics & Astronomy) 2024年第4期67卷 161-166页

作者： tao Yu Ch.ngyuan Cai Gerrit E.W.Bauer Sch.ol of Ph.sics Huazhong University of Science and TechnologyWuhan 430074China .WPI-AIMR and Institute for Materials Research.and SCIS Tohoku UniversitySendai 980-8577Japan Kavli Institute for Th.oretical Sciences University of Chinese Academy of SciencesBeijing 100190China

We report a th.ory of th.rmal spin pumping into proximity magnets under a transverse-bias-driven h.at flow of magnons in magnetic films wh.n th. dipolar coupling to th. magnetic gate is tuned to be “ch.ral”. Wh.le th.re is no rectification of th. magnon current in th. film, we predict th.t ch.rality diverts a large percentage(50% for perfect ch.rality) of it into th. gate. Th.s transverse th.rmal spin pumping effect can be controlled by rotating th. film magnetization and may h.lp manage th. h.at flow in future magnonic circuits.

关键词： magnon ch.rality quantum transport transistor

Electronic structure regulation and built-in electric field synergistically strength.n ph.tocatalytic nitrogen fixation performance on Ti-BiOBr/TiO_(2)h.terostructure

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Rare Metals 2024年第3期43卷 1125-1138页

作者： Ru-Qi Li Yu-Jie Bian Ch.n-Ming Yang Li Guo tao-Xia Ma Ch.an-tao Wang Feng Fu Dan-Jun Wang College of Ch.mistry and Ch.mical Engineering Yan’an UniversityYan’an Key Laboratory of Green Catalysis and Quality Improvement and Utilization of Low Rank CoalYan’an716000China

At present,industrial synth.tic ammonia was still obtained th.ough.th. h.bble-Bosch.process,with.large energy *** is a research.h.tspot to realize green synth.tic ammonia by using solar *** difficulty of ph.tocatalytic ammonia synth.sis was th.t th. ph.to-excited electrons h.ve not enough.energy to active N≡*** th.s study,Ti was doped into BiOBr by one-step h.droth.rmal meth.d,wh.ch.was oxidized into TiO_(2)wh.n th. doping amount reach.s th. maximum,in situ forming Ti_(0.31)B_(0.69)OB/TiO_(2)*** from th. synergistic effect of Ti doping and S-sch.me h.terojunction,th. synth.tic ammonia efficiency of Ti_(0.31)B_(0.69)OB/TiO_(2)-11.96 reach.d 1.643 mmol·g_(cat)^(-1)at mild conditions and with.ut h.le scavenger for up to 7 h.th. efficiency of synth.tic ammonia is 115 times,10.5 times and 3.3 times of th.t of BiOBr,Ti_(0.31)B_(0.69)OB and TiO_(2),***,DFT calculation confirms th.t Ti doping accurately refine th. electronic structure of BiOBr,facilitate nitrogen adsorption activation and reduce h.drogenation reaction energy barrier,th.s accelerating th. reaction kinetics of ph.tocatalytic nitrogen reduction(NRR),Meanwh.le,constructing S-sch.me h.terojunction boosts th. separation and transfer of ph.togenerated electron-h.le pairs,improving th. reduction ability of electrons in th. conduction band of TiO_(2)and th. oxidation ability of h.les in th. valence band of Ti_(0.31)B_(0.69)OB.

关键词： S-sch.me h.terostructure Electronic structure regulation Built-in electric field Synergistical stren4gth.ning Ph.tocatalytic nitrogen fixation

An Adaptive Strategy-incorporated Integer Genetic Algorith. for Wind Farm Layout Optimization

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Journal of Bionic Engineering 2024年第3期21卷 1522-1540页

作者： tao Zh.ng h.otian Li h.utian h. Zh.nyu Lei Sh.ngce Gao Faculty of Engineering University of ToyamaToyama9300887Japan

Energy issues h.ve always been one of th. most significant concerns for scientists *** th. ongoing over exploitation and continued outbreaks of wars,traditional energy sources face th. th.eat of *** energy is a readily available and sustainable energy *** farm layout optimization problem,th.ough.scientifically arranging wind turbines,significantly enh.nces th. efficiency of h.rnessing wind ***-h.uristic algorith.s h.ve been widely employed in wind farm layout *** paper introduces an Adaptive strategy-incorporated Integer Genetic Algorith.,referred to as AIGA,for optimizing wind farm layout *** adaptive strategy dynamically adjusts th. placement of wind turbines,leading to a substantial improvement in energy utilization efficiency with.n th. wind *** th.s study,AIGA is tested in four different wind conditions,alongside four oth.r classical algorith.s,to assess th.ir energy conversion efficiency with.n th. wind *** results demonstrate a notable advantage of AIGA.

关键词： Wind farm layout optimization problem Meta-h.uristic algorith.s Adaptive Integer genetic algorith.