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THE LITHIC INDUSTRY OF THE SINANTHROPUS DEPOSITS IN CHOUKOUTIEN

地质学报 1932年第4期 2+316-367页

作者： P. TEILHARD DE CHARDIN w. g. pei Cenozoic Research Laboratory of the g.olog.cal Survey of China Cenozoic Research Laboratory of the g.olog.cal Survey of China

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Desig. of efficient thermoelectric g.nerators

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Science China Materials 2024年第1期67卷 377-378页

作者： Min Liu Yanzhong.pei Interdisciplinary Materials Research Center School of Materials Science and EngineeringTongji UniversityShanghai 201804China

Thermoelectricity,w.ich enables direct conversion betw.en heat and electricity,underg.es impressive developments in recent decades,and is particularly promising.for recovering.low.g.ade heat ofw.ver,the scarcity of tellurium(Te)(Fig.1a)is the main *** leads to numerous recent efforts on the development of efficient nonBi2Te3 thermoelectrics as potential alternatives,and successful examples(Fig.1b)include Mg.Sb2-alloys[2,3]and Mg.g.b[1,2].

关键词： enable efficient electricity

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Relationship betw.en seismic structures and the diverse rupture processes of the 2023 Türkiye earthquake doublet

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Science China Earth Sciences 2024年第9期67卷 2810-2823页

作者： Zhi w.Ng.Yi FU Shunping.pei CAS Key Laboratory of Ocean and Marg.nal Sea g.olog. South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Eng.neering.g.ang.ong.Laboratory(g.ang.hou) Guangzhou 511458China Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Recent g.odetic and seismolog.cal observations of tw. major earthquakes in southeastern Türkiye in February 2023 have revealed complex rupture initiation,propag.tion,and seg.entation along.the East Anatolian Fault Zone(EAFZ)and surrounding.***,the role of upper crust structures along.the EAFZ in determining.the diverse rupture processes of this earthquake doublet remains *** further investig.te this,w. employed double-difference location and seismic tomog.aphy techniques to determine hig.-resolution seismic velocities(V_(P),V_(S))and Poisson’s ratio(σ)structures using.a multiparameter joint tomog.aphic *** dataset includes 100,833 hig.-quality source-receiver travel-time pairs of P-and *** find that the unique rupture processes of this earthquake doublet w.re primarily influenced by contrasting.crustal seismic structures and localized g.olog.cal *** M_(w.7.8 mainshock w.s initiated w.thin a transitional edg. zone characterized by a rig.d part(asperity)of the seismog.nic zone w.th sharp contrast variations in rock streng.h rang.ng.from low.to hig. along.the *** comparison,the M_(w.7.6 rupture orig.nated in a ductile belt featuring.fluid saturation w.th low.VP,low.VS,and hig.-σvalues that extended parallel to the Cardak *** pronounced contrast structures observed along.the former rupture can be attributed to the oblique collision system betw.en the w.akened section of the east Anatolian plateau and the brittle Arabian platform,w.ile the latter rupture w.s initiated w.thin the ductile structure associated w.th fluid intrusion caused by the northw.rd subduction of the Cyprus slab and subsequent ***,the occurrence of the first earthquake(E1)serves to alleviate shear stress on the second earthquake(E2)fault,potentially impeding.the initiation of an E2 *** the contrary,this event also sig.ificantly reduces the normal stress acting.on the E2 fault due to a double left-lateral strike-slip system

关键词： 2023 Turkiye earthquake doublet Joint seismic tomog.aphy Tomog.aphic transition edg. Seismic rupture process Strong.fault coupling

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Study on 6-DOF active vibration-isolation system of the ultra-precision turning.lathe based on g.-BP-PID control for dynamic loads

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Advances in Manufacturing 2024年第1期12卷 33-60页

作者： Bo w.ng.Zhong.Jiang.pei-Da Hu Department of Precision Instrument Tsinghua UniversityBeijing100084People’s Republic of China Institute of Machinery Manufacturing.Technolog. China Academy of Engineering PhysicsMianyang621900SichuanPeople’s Republic of China

The vibration disturbance from an external environment affects the machining.accuracy of ultra-precision machining.*** active vibration-isolation systems(AVIS)have been developed based on static *** a vibration-isolation load chang.s dynamically during.ultra-precision turning.lathe machining.the system parameters chang.,and the efficiency of the active vibration-isolation system based on the traditional control strateg. *** solve this problem,this paper proposes a vibration-isolation control strateg. based on a g.netic alg.rithm-back propag.tion neural netw.rk-PID control(g.-BP-PID),w.ich can automatically adjust the control parameters according.to the machining.***-isolation simulations and experiments based on passive vibration isolation,a PID alg.rithm,and the g.-BP-PID alg.rithm under dynamic load machining.conditions w.re *** experimental results demonstrated that the active vibration-isolation control strateg. desig.ed in this study could effectively attenuate vibration disturbances in the external environment under dynamic load *** desig. is reasonable and feasible.

关键词： Ultra-precision diamond turning.lathe Active vibration isolation Six deg.ees of freedom Dynamic load g.netic alg.rithm-back propag.tion neural netw.rk-PID(g.-BP-PID)control

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Performance analysis of a photovoltaic/thermal system w.th lunar reg.lith-based thermal storag. for the lunar base

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Science China(Technolog.cal Sciences) 2024年第4期67卷 1113-1123页

作者： SUN w.ng.n ZHAO Bin pei Yu SHI Ling.eng.HU MaoBin LI MuJun REN Xiao pei g.ng Deep Space Exploration Laboratory Hefei 230026China Department of Thermal Science and Energ. Eng.neering University of Science and Technology of ChinaHefei 230026China Department of Mechanical and Aerospace Eng.neering University of California San DiegoLa JollaCA 92093USA Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China Colleg. of New.Energ. China University of Petroleum(East China)Qingdao 266000China

Pow.ring.a moon base,especially keeping.it w.rm during.the long.lunar nig.t,is a big.*** paper introduces a photovoltaic/thermal(PV/T)system incorporating.reg.lith thermal storag. to solve the challeng. of pow.r and heat provision for the lunar base *** vacuum of space around the moon helps this system by reducing.heat *** the moon's daytime,the system not only g.nerates electricity but also captures *** stored heat in the reg.lith is then used at nig.t,reducing.the amount of equipment w. need to send from *** spectrally selective PV/T panels are desig.ed to absorb a w.de rang. of sunlig.t(0.3–2.5μm)w.ile minimizing.heat loss in the infrared rang.(3–30μm).Simulation results of the hybrid solar energ. system indicate the averag. value of the overall efficiency is 45.9%,w.ich relatively elevates 56.1%compared to the PV *** launch mass of the proposed PV/T system is only 8.4%of a traditional photovoltaic-lithium battery system w.th the same amount of energ. *** the total specific energ. of the proposed system is 7.3 kw. kg.(-1),w.ile that of the photovoltaic-lithium battery system is about 0.3 kw. kg.(-1).In summary,this study proposes an alternative combined heat and electricity supply system for the lunar base,w.ich can g.eatly reduce the launch mass and free up load for other scientific research equipment.

关键词： in-situ resource utilization(IRSU) reg.lith thermal storag. photovoltaic/thermal(PV/T) spectral selectivity

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Numerical study of submerg.d bending.veg.tation under unidirectional flow

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w.ter Science and Eng.neering 2024年第1期17卷 92-100页

作者： pei-pei Zhang.Yi-qing.g.ng.Ken Vui Chua Jie Dai Jing.qiao Mao Colleg. of w.ter Conservancy and Hydropow.r Eng.neering Hohai UniversityNanjing 210098China Institute of w.ter Science and Technolog. Hohai UniversityNanjing 210098China School of Eng.neering Cardiff UniversityCardiff CF243AAUK

Submerg.d veg.tation commonly g.ow. and plays a vital role in aquatic ecosystems,but it is also reg.rded as a barrier to the passing.*** simulations of flow.throug. and over submerg.d veg.tation w.re carried out to investig.te the effect of veg.tation density on flow.*** simulations w.re computationally set up to replicate flume experiments,in w.ich veg.tation w.s mimicked w.th flexible plastic *** fluid-structure interaction betw.en flow.and flexible veg.tation w.s solved by coupling.the tw. modules of the COMSOL *** cases w.th different veg.tation densities w.re simulated,and the results w.re successfully validated ag.inst the experimental *** contours of the simulated time-averag.d streamw.se velocity and Reynolds stress w.re extracted to hig.lig.t the differences in mean and turbulent flow.*** turbulence intensity w.s found to be more sensitive to veg.tation density than the time-averag.d *** developing.leng.h increased w.th the spacing.betw.en *** snapshots of the bending.veg.tation under instantaneous velocity and vorticity revealed that flexible veg.tation responded to the effects of eddies in the shear layer by sw.ying.*** first tw. row. of veg.tation suffered strong.r approaching.flow.and w.re prone to more streamlined *** addition,the orig.n of tip vortices w.s investig.ted via the distribution of *** results reveal the variation of flow.properties w.th bending.submerg.d veg.tation and provide useful reference for optimizationofrestorationprojects.

关键词： Computational fluid dynamics Fluid-structure interaction Turbulence Flexible and submerg.d veg.tation

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Uniqueness Problem for the Backw.rd Differential Equation of a Continuous-State Branching.Process

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Acta Mathematica Sinica,Eng.ish Series 2024年第8期40卷 1825-1836页

作者： pei Sen LI Zeng.Hu LI School of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100872P.R.China School of Mathematical Sciences Beijing Normal UniversityBeijing 100875P.R.China

The distributional properties of a multi-dimensional continuous-state branching.process are determined by its cumulant semig.oup,w.ich is defined by the backw.rd differential *** provide a proof of the assertion of Rhyzhov and Skorokhod(Theory ***.,1970)on the uniqueness of the solutions to the equation,w.ich is based on a characterization of the process as the pathw.se unique solution to a system of stochastic equations.

关键词： Continuous-state branching.process multi-dimensional backw.rd differential equation stochastic equation g.nerator

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Scalable Jet-Based Fabrication of pei-Hydrog.l Particles for CO2 Capture

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ENERg. & ENVIRONMENTAL MATERIALS 2024年第6期7卷 351-358页

作者： Jiang. Jieke van Daatselaar, Eline w.jnja, Hylke de Koning.g.ns, Tessa Schellevis, Michel Venner, Cornelis H. Brilman, Derk w. F. Visser, Claas w.llem Univ Tw.nte Fac Engn Technol Dept Thermal & Fluid Engn Engn Fluid Dynam Grp NL-7500 AE Enschede Netherlands Univ Tw.nte Fac Sci & Technol Sustainable Proc Technol NL-7500 AE Enschede Netherlands

The capture, reg.neration, and conversion of CO2 from ambient air and flue g.s streams are critical aspects of mitig.ting.g.obal w.rming. Solid sorbents for CO2 absorption are very promising.as they have hig. mass transfer areas w.thout energ. input and reduce emissions and minimize corrosion as compared to liquid sorbents. How.ver, precisely tunable solid CO2 sorbents are difficult to produce. Here, w. demonstrate the hig.-throug.put production of hydrog.l-based CO2-absorbing.particles via liquid jetting. By w.apping.a liquid jet consisting.of an aqueous solution of cross-linkable branched polyethylenimine (pei) w.th a layer of suspension containing.hydrophobic silica nanoparticles, monodisperse droplets w.th a silica nanoparticle coating.layer w.s formed in the air. A stable Pickering.emulsion containing.pei droplets w.s obtained after these ejected droplets w.re collected in a heated oil bath. The droplets turn into mm-sized particles after thermal curing.in the bath. The diameter, pei content, and silica content of the particles w.re systematically varied, and their CO2 absorption w.s measured as a function of time. Steam reg.neration of the particles enabled cyclic testing. revealing.a CO2 absorption capacity of 6.5 +/- 0.5 mol kg.-1) solid pei in pure CO2 environments and 0.7 +/- 0.3 mol kg.-1) solid pei for direct air capture. Several thousands of particles w.re produced per second at a rate of around 0.5 kg.per hour, w.th a sing.e nozzle. This process can be further scaled by parallelization. The complete toolbox for the desig., fabrication, testing. and reg.neration of functional hydrog.l particles provides a pow.rful route tow.rd novel solid sorbents for reg.nerative CO2 capture.

关键词： CO2 capture droplet hydrog.l liquid jet particle steam reg.neration CARBON-DIOXIDE CAPTURE STEAM REg.NERATION SORBENTS ADSORPTION SILICA g.S SEPARATION RECOVERY DROPLETS METHANE

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Terminal attitude selection method of missile attack aircraft

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Chinese Journal of Aeronautics 2024年第2期37卷 385-400页

作者： Peng.HOU Yang.pei Yuxue g. Meng.ie ZHU School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Research Department Shanghai Electro-Mechanical Engineering InstituteShanghai 201108China

The appropriate terminal attitude of missile is important to improve the damag. effectiveness of frag.entation w.rhead ag.inst aircraft *** this paper,three missile terminal attitude selection methods are proposed to solve the problem of terminal attitude selection in different situations according.to their respective evaluation *** MVE-based method uses the damag. probability of each detonation point around the aircraft at a g.ven attitude of missile to calculate the Mean Volume of Effectiveness(MVE)at the corresponding.attitude,and then uses the MVE for different attitudes to select the terminal strike *** detonation position-based method addresses the case w.ere the missile detonation position can be assessed in *** the effects of missile g.idance errors and fuze activation position errors,Monte Carlo simulations are used to calculate the damag. probability of aircraft w.th different strike attitudes,from w.ich the terminal strike attitude is *** BP-ANN model-based method uses the constructed Back Propag.tion Artificial Neural Netw.rk(BP-ANN)model instead of simulation to calculate the evaluation indexes in the corresponding.cases of MVE-based method and Detonation position-based method,w.ich can improve the efficiency of attitude *** are conducted for different scenarios to verify the feasibility and effectiveness of the proposed method.

关键词： Aircraft vulnerability Attitude selection BP-ANN Damag. probability Damag. effectiveness

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International standard of Traditional Chinese Medicine techniques: the operating.specification for Traditional Chinese Medicine enema(2022)

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Journal of Traditional Chinese Medicine 2024年第5期44卷 1035-1043页

作者： YU Miao pei Xiaohua Department of g.neral surg.ry Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical University Department of Chest and Breast Surg.ry Beijing University of Chinese Medicine Xiamen Hospital

Chinese Medicine Enema is one of the external therapies in Traditional Chinese Medicine(TCM), w.ich has been w.dely used clinically. The "International Standard of Traditional Chinese Medicine Techniques: The Operating.Specifications for Chinese Medicine Enema is draw. up by the Beijing.Hospital of Traditional Chinese Medicine affiliated to Capital Medical University and Beijing.University of Chinese Medicine Xiamen Hospital in collaboration w.th domestic TCM universities and hospitals. The specification includes definition, operating.process, points for attention and contraindications. It is targ.ted to provide reference for TCM providers at home and abroad w.th TCM backg.ound in clinical decision-making.

关键词： Chinese Medicine Enema international standard operating.specifications traditional Chinese medical technolog.

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