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Optimising multi-vent module-based adaptive ventilation using a novel parameter for improved indoor air quality.and health protection

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Building Simulation 2024年第1期17卷 113-130页

作者： Haotian zhang Xiaoxiao ding Weirong zhang Weijia zhang y.ngli Xuan Key.Laboratory.of Green Built Environment and Energy.Efficient Technology Beijing University of TechnologyBeijing 100124China Department ofArchitecture TokyoPolytechnic UniversityTokyoJapan

As infectious respiratory.diseases are highly.transmissible through the air,researchers have improved traditional total volume air distribution sy.tems to reduce infection ***-vent module-based adaptive ventilation(MAV)is a novel ventilation ty.e that facilitates the switching of inlets and outlets to suit different indoor scenarios without changing ductwork ***,little research has evaluated MAV module sizing and air velocity.selection,both related to MAV sy.tem efficiency.in removing contaminants and the corresponding level of protection for occupants in the ventilated ***,the module-source offset ratio(MSOR)is proposed,based on the MAV module size and its distance from an infected occupant,to inform selection of optimal MAV module *** fluid dy.amics simulations illustrated contaminant distribution in a two-person MAV equipped *** phase particles modelled respiratory.contaminants from the infected occupant,and contaminant concentration distributions were compared under four MAV air distribution lay.uts,three air velocities,and three module sizes considered using the *** indicate that lower air velocities favour rising contaminant levels,provided the ventilation rate is *** contaminant discharge can be achieved when the line of outlets is located directly.above the infected *** this parameter to guide MAV sy.tem design,85.7% of contaminants may.be rendered harmless to the human body.within 120 s using the default air vent lay.ut.A more appropriate supply.air velocity.and air vent lay.ut increases this value to 91.4%.These results are expected to inform the deploy.ent of MAV sy.tems to reduce airborne infection risk.

关键词： multi-vent module-based adaptive ventilation computational fluid dy.amics indoor air quality infection control

An approach to estimate tree height using PolInSAR data constructed by.the Sentinel-1 dual-pol SAR data and RVoG model

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Journal of Electronic Science and Technology 2024年第3期22卷 69-79页

作者： y.n zhang ding-Feng Duan School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu611731China

We estimate tree heights using polarimetric interferometric sy.thetic aperture radar(PolInSAR)data constructed by.the dual-polarization(dual-pol)SAR data and random volume over the ground(RVoG)*** the Sentinel-1 SAR dual-pol(SVV,vertically.transmitted and vertically.received and SVH,vertically.transmitted and horizontally.received)configuration,one notes that S_(HH),the horizontally.transmitted and horizontally.received scattering element,is *** S_(HH)data were constructed using the SVH data,and polarimetric SAR(PolSAR)data were *** proposed approach was first verified in simulation with satisfactory.*** was next applied to construct PolInSAR data by.a pair of dual-pol Sentinel-1A data at Duke Forest,North Carolina,*** to local observations and forest descriptions,the range of estimated tree heights was overall *** the heights with the ICESat-2 tree heights at 23 sampling locations,relative errors of 5 points were within±30%.Errors of 8 points ranged from 30%to 40%,but errors of the remaining 10 points were>40%.The results should be encouraged as error reduction is *** instance,the construction of PolSAR data should not be limited to using SVH,and a combination of SVH and SVV should be ***,an ensemble of tree heights derived from multiple PolInSAR data can be considered since tree heights do not vary.much with time frame in months or one season.

关键词： Constructed polarimetric SAR data Dual polarization Sentinel-1 SAR data Polarimetric interferometric SAR Random volume over the ground model Tree height estimation

Dy.amic Modeling and Experimental Verification of an RPR Ty.e Compliant Paralle Mechanism with Low Orders

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 83-94页

作者： Shuang zhang Jingfang Liu Huafeng ding y.nbin zhang School of Mechatronics Engineering Henan University of Science and TechnologyLuoyangHenanChina Faculty.of Materials and Manufacturing College of Mechanical Engineering and Applied Electronics TechnologyBeijing University of TechnologyBeijingChina Key.laboratory.of advanced manufacturing technology Beijing University of TechnologyBeijingChina School of Mechanical Engineering and Electronic Information China University of Geosciences(Wuhan)WuhanChina Center of Machinery.Equipment Advanced Manufacturing of Henan Province LuoyangChina

Efficiency.of calculating a dy.amic response is an important point of the compliant mechanism for posture *** modeling with low orders of a 2R1T compliant parallel mechanism is studied in the *** mechanism with two out-of-plane rotational and one lifting degrees of freedom(DoFs)play. an important role in posture *** on elastic beam theory.the stiffness matrix and mass matrix of the beam element are established where the moment of inertia is *** improve solving efficiency.a dy.amic model with low orders of the mechanism is established based on a modified modal sy.thesis ***,each branch of the RPR ty.e mechanism is divided into a ***,a set of hy.othetical modes of each substructure is obtained based on the C-B ***,dy.amic equation of the whole mechanism is established by.the substructure assembly.A dy.amic experiment is conducted to verify.the dy.amic characteristics of the compliant mechanism.

关键词： Compliant parallel mechanism Dy.amic model Modal sy.thesis method Dy.amic experiment

Effective removal of Sb(V)from aqueous solutions by.micro-electroly.is with composite scrap iron-manganese as filler

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Journal of Zhejiang University.Science A(Applied Phy.ics & Engineering) 2024年第6期25卷 516-524页

作者： Shangkun ding Saihua HUANG y.ping zhang y.ngchao ZHOU Institute of Municipal Engineering Zhejiang UniversityHangzhou310058China Zhejiang University.of Water Resources and Electric Power Hangzhou310018China

Micro-electroly.is(ME)technology.is investigated for improving the efficiency.of removal of pentavalent antimony.Sb(V))from the *** this study.an ME sy.tem composed of scrap iron filings,waste manganese fillings,and activated carbon(Fe-Mn-C ME)was used to efficiently.remove Sb(V).The results proved that,compared with conventional iron-carbon micro-electroly.is(Fe-C ME),Fe-Mn-C ME significantly.enhances the removal rate of Sb(V)when the hy.raulic retention time is 10–24 *** Fe-Mn flocs produced by.this sy.tem were analy.ed using X-ray.diffraction(XRD),energy.dispersive X-ray.spectroscopy.EDS),X-ray.photoelectron spectroscopy.XPS),and Brunauer-Emmett-Teller(BET)surface area analy.is,which revealed that the flocs were mostly.Mn-substituted FeOOH and had a relatively.larger specific surface area,providing better adsorption ***,it was found that the removal rate of Sb(V)decreased as the iron-carbon mass ratio increased,while it first increased and then decreased as the manganese content *** reduction of Fe(III)was accelerated with an increase in the addition of manganese,leading to an increase in the concentration of Fe(II).The electron transfer and the formation of Fe(II)were facilitated by.the potential difference between manganese and carbon,as well as by.the formation of microcells between iron and manganese,which improved the reduction ability.of Sb(V).From our thorough investigation and research,this is the first report that has proposed Fe-Mn-C ME for removing *** provides a novel approach and technological support for removing Sb(V)efficiently.

关键词： Antimony Iron Manganese Micro-electroly.is(ME) Electrochemistry Mechanism

Sy.thesis of hierarchically.porous carbon materials by.zinc salts-assisted carbonization of biomass and organic solid wastes

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Particuology 2024年第1期84卷 45-52页

作者： Le-Le zhang Lei Tong y.nwei ding Wanqun zhang Hai-Wei Liang Hefei National Research Center for Phy.ical Sciences at the Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei230026China

Hierarchically.porous carbons(HPCs)with multimodal pores have attracted considerable attention due to their unique phy.ical and chemical properties and various application potentials in heterogeneous cataly.is,environmental treatment,and energy.storage and ***,we report a general and simple zinc salts-assisted method for the sy.thesis of HPCs with varied porosity.and chemical func-tionalities by.the direct carbonization of diverse biomass and *** the carbonization,zinc salts are thermally.decomposed into nanoparticles that serve as in-situ templates to introduce nanopores in *** prepared HPCs exhibit high specific surface areas(up to 2432 m2 g-1),large pore volumes(up to 4.30 cm^(3)g^(-1)),and broad pore size ***,the zinc salts can be recovered and recy.led,supporting the sustainable production of HPCs on large *** prepared HPCs-supported cataly.ts with atomically.dispersed metal sites exhibit promising electrocataly.ic performance for the oxy.en reduction reaction.

关键词： Hierarchical porous carbon Zinc salts Biomass Wastes Electrocataly.is

Integrated Active Suspension and Anti-Lock Braking Control for Four-Wheel-Independent-Drive Electric Vehicles

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 87-98页

作者： Ze Zhao Lei zhang Xiaoling ding Zhiqiang zhang Shaohua Li Liang Gu National Engineering Research Center for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China State Key.Laboratory.of Mechanical Behavior and Sy.tem Safety.of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

This paper presents an integrated control scheme for enhancing the ride comfort and handling performance of a four-wheel-independent-drive electric vehicle through the coordination of active suspension sy.tem(ASS)and anti-lock braking sy.tem(ABS).First,a longitudinal-vertical coupled vehicle dy.amics model is established by.integrating a road input *** the coupling mechanisms between longitudinal and vertical vehicle dy.amics are *** ASS-ABS integrated control sy.tem is proposed,utilizing an H∞controller for ASS to optimize load transfer effect and a neural network sliding mode control for ABS ***,the effectiveness of the proposed control scheme is evaluated through comprehensive tests conducted on a hardware-in-loop(HIL)test *** HIL test results demonstrate that the proposed control scheme can significantly.improve the braking performance and ride comfort compared to conventional ABS control methods.

关键词： Four-wheel-independent-drive electric vehicles Active suspension sy.tem(ASS) Anti-lock braking sy.tem(ABS) Vertical-longitudinal vehicle dy.amics

Solution-processed rare-earth thulium oxide with high permittivity.for low-voltage transistor and inverters applications

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Journal of Rare Earths 2024年第8期42卷 1604-1609,I0007页

作者： Daiming Liu Fei Wang y.ngtao zhang y.'nan ding Shandong Engineering Laboratory.for Preparation and Application of High-performance Carbon-Materials College of Electromechanical EngineeringQingdao University of Science&TechnologyQingdao266061China College of Electronic and Information Engineering Shandong University of Science and TechnologyQingdao266590China

The use of high-permittivity.high-k) thin films as gate dielectrics is essential in the development of lowpower electronics,In this work,rare-earth thulium oxide(Tm_(2)O_(3)) thin films were prepared by.a facile solution process and annealed at various temperatures from 400 to 700℃.The evolution of the phy.ical and dielectric properties of Tm_(2)O_(3) thin film with annealing temperature was *** is demonstrated that the Tm_(2)O_(3) thin film annealed at 600℃ exhibits the optimal performance,including a low leakage current of 3×10^(-10) A/cm^(2),a large areal capacitance of 250 nF/cm^(2) at 100 Hz,and a high permittivity.value of *** Tm_(2)O_(3) thin film as a gate insulator was integrated into the thin film transistor(TFT) employ.ng In_(2)O_(3)-based semiconducting *** In_(2)O_(3) TFT with 600℃-annealed Tm_(2)O_(3) dielectric exhibits the superior perfo rmance,with a high I_(on)/I_(off) of 1.65×10^(7),a small subthre shold swing(SS) value of 0.2 V/dec,a V_(TH) of+1.8 V,and a mobility.of 1.68 cm^(2)/(V·s).Furthermore,an inverter constructed by.connecting the TFT with a resistor exhibits full-swing *** work provides a facile and appealing method for preparing the high-k Tm_(2)O_(3) thin films as alternative gate dielectrics with the potential for use in low-power electronics and logic circuit applications.

关键词： Rare earths Tm_(2)O_(3) Dielectric Transistor Inverter

Sy.ergistic enhancement on mechanical properties and corrosion resistance of biodegradable Mg-Zn-y.alloy.via V-microalloy.ng

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Journal of Magnesium and Alloy. 2024年第2期12卷 530-545页

作者： Jiaxin zhang Xin ding Ruirun Chen Wenchao Cao Jinshan zhang Rui Zhao National Key.Laboratory.for Precision Hot Processing of Metals Harbin Institute of TechnologyNo.92West Dazhi StreetHarbinHeilongjiang 150001China College of Materials Science and Engineering Taiyuan University of TechnologyNo.79West Yingze StreetTaiyuanShanxi 030024China

For the sake of improving the mechanical properties and corrosion resistance of biodegradable Mg alloy.sy.ergistically.various content of element V(0,0.05,0.10,0.15,0.20 wt.%)are introduced into an Mg-Zn-y.alloy.with long-period stacking ordered(LPSO)structure,and the effects of V on its microstructure,mechanical properties and corrosion resistance are investigated *** results indicate that the grains are effectively.refined by.V addition,and the primary.-Mg in Mg-Zn-y.V0.1 alloy.is most significantly.refined,with grain size being decreased by.62%.The amount of 18R LPSO structure is increased owing to the V *** growth mode of the second phase(W-phase and 18R LPSO structure)is transformed to divorced growth pattern,which ascribes to the thermody.amic drive force of V to promote the nucleation of LPSO ***,18R LPSO structure presents a continuous *** to grains refinement and modification of second phase,the tensile strength and strain of alloy. are both enhanced ***,the ultimate tensile strength and the elongation of V0.1 alloy.are 254 MPa and 15.26%,which are 41%and 61%higher than those of V-free alloy.*** to the continuously.distributed 18R LPSO structure with refined grains and stable product film,the weight loss and hy.rogen evolution corrosion rates of V0.1 alloy.are 7.1 and 6.2 mmy.(-1),respectively.which are 42.6%and 45.4%lower than those of V-free alloy.

关键词： Corrosion Mechanical property V-microalloy.ng LPSO SKPFM

Late Mesoproterozoic to Early.Neoproterozoic Tectonic Evolution of the SW y.ngtze Block, South China: Evidence from U-Pb Geochronology.and Lu-Hf Isotopes of Detrital Zircons from Sedimentary.Rocks

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Journal of Earth Science 2024年第3期35卷 812-827页

作者： Peiwen Liu Xiaozhong ding y.nxue Liu Jibiao zhang Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China School of Civil and Hy.raulic Engineering Xichang UniversityXichang 615000China

In situ zircon U-Pb geochronological and Lu-Hf isotope studies of detrital zircons from Late Mesoproterozoic to Early.Neoproterozoic sedimentary.units on the southwestern margin of the y.ngtze Block have important implications for the tectonic evolution of the y.ngtze *** Huili Group contains zircons whose ages are mainly.Late Archean to Mesoproterozoic(2650-2450,2100-1800,and 1350-1150 Ma).The Dengxiangy.ng Group has one major age population of 1900-1600 Ma,and two subordinate age populations of 1350-1100 and 2300-2000 *** Group sedimentary.rocks have a zircon age population mainly.in the range of 970-850 Ma,contemporaneous with the ages of widespread arc-related magmatism in the western y.ngtze *** these results with previous work,the Huili and Dengxiangy.ng groups were most likely.deposited during ca.1160 to 1000 Ma in an intra-continental rift basin setting,while the y.nbian Group accumulated during>920 to 782 Ma in a back-arc basin setting at the southwestern margin of the y.ngtze *** addition,all these results further suggest a tectonic transition from a continental rift basin to a convergent environment at the southwestern margin of the y.ngtze Block at 1000-970 Ma.

关键词： Late Mesoproterozoic Early.Neoproterozoic zircon U-Pb age Lu-Hf isotope southwestern y.ngtze Block geochronology