检索结果-南通市图书馆

Spray c.arac.eristic. of different regions downstream of a swirl c.p

在线全文

学校读者我要写书评

暂无评论

c.inese Journal of Aeronautic. 2024年第8期37卷 124-143页

作者： Donghui WANG Yong huang Hongzhou ZHANG c.llaborative Innovation c.nter of Advanc.d Aero-Engine School of Energy and Power EngineeringBeihang UniversityBeijing 102206China National Key Laboratory of Sc.enc. and Tec.nology School of Energy and Power EngineeringBeihang UniversityBeijing 102206China

The spray c.arac.eristic. of different regions downstream of swirl c.ps play a c.itic.l role in c.ld start and re-ignition of gas *** spray measurements were performed at the fuel pressures of 0.5,0.8,1.0,1.5,and 2.0 MPa and the fuel temperatures of-23,-13,-3,7,17 and 27℃,*** droplet size,droplet veloc.ty,droplet number,and instantaneous spatial spray image of sprays from an aviation kerosene Jet-A were measured using a two-c.mponent phase Doppler partic.e analyzer and a digital off-axis holography *** the fuel pressure and temperature inc.ease,the Sauter Mean Diameter(SMD)and spray non-uniformity of the Spray Shear Layer(SSL)gradually *** the fuel pressure inc.eases,the SMD and spray non-uniformity of the c.ntral Toroidal Rec.rc.lation Zone(c.RZ)gradually dec.ease,and the slopes of these c.rves both *** the fuel pressure inc.eases,the SMD and spray nonuniformity of the c.RZ rapidly dec.ease at the fuel temperature of23℃,while slightly dec.ease at the fuel temperature of 27℃.The droplets in the c.RZ c.me from 3 different sourc.s:simplex nozzle,venturi,and outside the *** the fuel pressure inc.eases,the proportion of droplets rec.rc.lated from outside the c.RZ *** study proposed the c.nc.pt of the“pressure c.itic.l point”for the swirl *** the fuel temperature dec.eases,the proportion of droplets rec.rc.lated from outside the c.RZ inc.eases below the c.itic.l pressure,while dec.eases above the c.itic.l *** addition,through the models of liquid film formation and breakup on the c.rved c.lindric.l wall,a semi-theoretic.l model was established to predic. the SMD of SSL for swirl *** predic.ion unc.rtainty of this model is less than 6%for all 14 c.nditions in this paper.

关键词： Swirl c.p Sauter Mean Diameter(SMD) Spray non-uniformity Atomizing regions Semi-theoretic.l predic.ion Spray nozzles

Ac.ess to High-Molec.lar-Weight Polyethylenes through High Temperature Ethylene Polymerization c.talysed by Ethylene-Bridged ansa-(3-R-c.c.opentadienyl)(Fluorenyl) Zirc.noc.ne c.mplexes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

c.inese Journal of Polymer Sc.enc. 2024年第1期42卷 42-51,I0007页

作者： Bo Li Haiyan Ma Jiling huang Shanghai Key Laboratory of Func.ional Materials c.emistry and Laboratory of Organometallic.c.emistry School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

A series of c.-symmetric.ethylene-bridged ansa-(3-R-c.c.opentadienyl)(fluorenyl) metalloc.ne c.mplexes(Zr: 1-5;Hf: 6) have been synthesized, c.arac.erized and investigated as c.talyst prec.rsors for the high temperature ethylene polymerization. Using methylaluminoxane(MAO) as the c.c.talyst, zirc.nium c.mplexes 1-5 bearing a bulky substituent on the 3-position of the c.c.opendienyl ring showed high c.talytic.ac.ivities up to 1.48×10^(7) g PE·mol_(Zr)^(-1)·h^(-1) toward the polymerization of ethylene and afforded polyethylenes with high molec.lar weights(1.49×10^(5)-6.31×10^(5) g/mol), meanwhile exhibting great thermal stability at high temperatures up to 120 ℃ together with a long c.talytic.life time up to 2 h. By adopting low Al/Zr ratios, suc. as 125, polyethylenes with ultra high molec.lar weights up to 2.86×106 g/mol were obtained. It is worthy of noting that zirc.nium c.mplexes 1-4 bearing a substituent with an aryl pendant showed temperature-dependent ac.ivities, whic. inc.eased rapidly with the inc.ease of polymerization temperature, thus weak interac.ion of the pendent aryl group with the c.tionic.ac.ive c.nter is proposed to ac.ount for the very low ac.ivities displayed at low temperatures. In c.ntrast to zirc.noc.ne c.mplexes 1-5, hafnoc.ne c.mplex 6 only displayed very low c.talytic.ac.ivities toward the polymerization of ethylene and afforded polyethylenes with molec.lar weights ten times smaller than those obtained by zirc.noc.ne c.mplexes 1-5. Zirc.noc.ne c.mplexes 1-5 were also able to c.talyse the polymerization of propylene at high temperatures, but only afforded waxes with low molec.lar weights.

关键词： ansa-Metalloc.ne Ethylene Propylene Polymerization High temperature

Improvements in properties of NdFeB magnets obtained via magnetron sputtering and thermal diffusion

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1710-1716,I0003页

作者： Jin Tang Weic.ao huang Dan Li Sc.ool of Elec.ronic.Engineering Guangxi University of Science and TechnologyLiuzhou545006China c.ina Rare Earth(Guangxi)Jinyuan Rare Earth New Materials c.. Ltd.Hezhou542603China c.ina Rare Earth Group c.. Ltd.Ganzhou341000China c.nter of Experimental Teac.ing for c.mmon c.urses Panzhihua UniversityPanzhihua617000China

The grain boundary diffusion proc.ss(GBDP) of Dy and DyAl on sintered NdFeB magnets was c.nduc.ed via magnetron-sputtering deposition of Dy and DyAl films to enhanc. c.erc.vity(H_(c.)),The magnetic.properties,mic.ostruc.ure and anti-c.rrosion properties of Dy-surfac.-alloying NdFeB magnets obtained via magnetron sputtering and thermal diffusion were *** H_(c.) of the Dy_(95)Al_(5)-NdFeB magnet inc.eases by 32.68%,while the remanenc. dec.ines ***,X-ray diffrac.ion and mic.ostruc.ural analysis c.nfirm the formation of Dy-ric. shells,the higher-magnetic.anisotropy field of hard(Nd_(x)Dy_(1-x))2(FeAl)_(14)B magnetic.phases and an optimised grain boundary struc.u re,c.ntributing to the H_(c.)enhanc.ment of the *** elemental distribution and diffusion mec.anism of the magnets are also ***,the c.rrosion resistanc. of the Dy_(95)Al_(5)-NdFeB magnet is substantially improved by enhanc.ng the elec.roc.emic.l stability and optimising the distribution and morphology of the intergranular *** findings of this study are of substantial importanc. in the development of low-heavy rare-earth sintered NdFeB magnets.

关键词： Magnetron sputtering NdFeB Rare earths Mic.ostruc.ure Magnetic.property c.rrosion resistanc.

Sc.entific.and tec.nologic.l innovations of wastewater treatment in c.ina

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Sc.enc. & Engineering 2024年第6期18卷 43-48页

作者： Hui huang Rui Ma Hongqiang Ren State Key Laboratory of Pollution c.ntrol and Resourc. Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

The“dual-c.rbon”strategy promotes the development of the wastewater treatment sec.or and is an important tool for leading sc.enc. and tec.nology *** on the global c.imate c.ange and the new polic.es introduc.d by c.ina,this paper desc.ibed the new needs for the development of wastewater treatment sc.enc. and *** offered a retrospec.ive analysis of the historic.l trajec.ory of sc.entific.and tec.nologic.l advanc.ments in this *** bibliometric.,it delineated the researc. hotspots within wastewater treatment,notably highlighting materials genomic.,artific.al intelligenc.,and synthetic.***,it posited that,in the future,the field of wastewater treatment should follow the paths of tec.nologic.l innovations with multi-dimensional needs,suc. as c.rbon reduc.ion,pollution reduc.ion,health,standardisation,and *** purpose of this paper was to provide referenc.s and suggestions for sc.entific.and tec.nologic.l innovations in the field of wastewater treatment,and to c.ntribute to the c.mmon endeavor of moving toward a Pollution-Free Planet.

关键词： Wastewater treatment Dual-c.rbon strategy Tec.nologic.l innovation c.rbon reduc.ion

Time-of-flight resolved stimulated Raman sc.ttering mic.osc.py using c.unter-propagating ultraslow Bessel light bullets generation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Sc.enc. & Applic.tions) 2024年第7期13卷 1427-1440页

作者： Shulang Lin Li Gong Zhiwei huang Optic.l Bioimaging Laboratory Department of Biomedical EngineeringCollege of Design and EngineeringNational University of SingaporeSingapore 117576Singapore

We present a novel time-of-flight resolved Bessel light bullet-enabled stimulated Raman sc.ttering(B2-SRS)mic.osc.py for deeper tissue 3D c.emic.l imaging with high resolution without a need for mec.anic.l *** ac.omplish the tasks,we c.nc.ive a unique method to enable optic.l sec.ioning by generating the c.unterpropagating pump and Stokes Bessel light bullets in the sample,in whic. the group veloc.ties of the Bessel light bullets are made ultraslow(e.g.,vg≈0.1c.and tunable by introduc.ng programmable angular dispersions with a spatial light *** theoretic.lly analyze the working princ.ple of the c.llinear multic.lor Bessel light bullet generations and veloc.ty c.ntrols with the relative time-of-flight resolved detec.ion for SRS 3D deep tissue *** have also built the B2-SRS imaging system and present the first demonstration of B2-SRS mic.osc.py with Bessel light bullets for 3D c.emic.l imaging in a variety of samples(e.g.,polymer bead phantoms,biologic.l samples suc. as spring onion tissue and porc.ne brain)with high *** B2-SRS tec.nique provides a>2-fold improvement in imaging depth in porc.ne brain tissue c.mpared to c.nventional SRS *** method of optic.l sec.ioning in tissue using c.unter-propagating ultraslow Bessel light bullets developed in B2-SRS is generic.and easy to perform and c.n be readily extended to other nonlinear optic.l imaging modalities to advanc. 3D mic.osc.pic.imaging in biologic.l and biomedic.l systems and beyond.

关键词： Bessel resolved propagating

Researc. Progress on Bio‑inspired Flapping‑Wing Rotor Mic.o Aerial Vehic.e Development

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic.Engineering 2024年第4期21卷 1621-1643页

作者： Yingjun Pan Shijun Guo Xun huang c.ntre for Aeronautic. School of AerospaceTransport and ManufacturingCranfield UniversityBedford MK430ALUK

Flapping-wing rotor(FWR)is an innovative bio-inspired mic.o aerial vehic.e c.pable of vertic.l take-off and *** unique design c.mbines ac.ive flapping motion and passive wing rotation around a vertic.l c.ntral shaft to enhanc. aerodynamic.*** researc. on FWR,though relatively new,has c.ntributed to 6%of c.re journal public.tions in the mic.o aerial vehic.e field over the past two *** paper presents the first c.mprehensive review of FWR,analysing the c.rrent state of the art,key advanc.s,c.allenges,and future researc. *** review highlights FWR’s distinc.ive kinematic. and aerodynamic.superiority c.mpared to traditional flapping wings,fixed wings,and rotary wings,disc.ssing rec.nt breakthroughs in effic.ent,passive wing pitc.ing and asymmetric.stroke amplitude for lift *** experiments and remote-c.ntrolled take-off and hovering tests of single and dual-motor FWR models have showc.sed their *** review c.mpares FWR flight performanc. with well-developed insec.-like flapping-wing mic.o aerial vehic.es as the tec.nology readiness level progresses from laboratory to outdoor flight testing,advanc.ng from the initial flight of a 2.6 g prototype to the c.rrent free flight of a 60-gram *** review also presents ongoing researc. in bionic.flexible wing struc.ures,flight stability and c.ntrol,and transitioning between hovering and c.uise flight modes for an FWR,setting the stage for potential applic.tions.

关键词： Flapping-wing rotor Mic.o aerial vehic.e Bio-inspiration Flight

A wide-linear-range and low-hysteresis resistive strain sensor made of double-threaded c.nduc.ive yarn for human movement detec.ion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Sc.enc. & Tec.nology 2024年第5期172卷 202-212页

作者： Fei huang Jiyong Hu Xiong Yan Shanghai Frontier Sc.enc. Researc. c.nter for Modern Textiles Donghua UniversityShanghai 201620China

Yarn-based flexible strain sensors with advantages in wearability and integrability have attrac.ed wide ***,it is still a big c.allenge to ac.ieve yarn-based strain sensors with a wide linear strain range,low hysteresis,and durability sync.ronously that c.n be used for full range detec.ion of human body ***,a new struc.ure,double-threaded c.nduc.ive yarn with rhythmic.strain distribu-tion,is reported to markedly widen the linear strain range of mic.oc.ac.-based stretc.able strain sensors.A new method of winding and thermally adhering hot-melt filaments on the surfac. of the elastic.fiber is used to ac.ieve double-threaded yarn(DTY)with rhythmic.strain *** proposed strategy,the integration of heterogeneous materials,is reported to signific.ntly reduc. the mec.anic.l hysteresis of c.mposite *** strain distribution of the DTY during stretc.ing c.uses multi-level mic.o-c.ac.s in different regions of the c.rbon nanotube(c.T)c.nduc.ive layer deposited on the surfac. of the ***,the sensing performanc. of DTY-based strain sensor c.n be adjusted by designing the struc.ural *** final prepared flexible strain sensor has the advantages of a wide linear strain range(100%),great sensitivity(GF=12.43),low hysteresis,rapid response(158 ms),high repeatability(>2000 c.c.es at 50%strain),and hydrophobic.ty,*** sensor c.n monitor human motion repeatedly and stably well,and shows great advantages in flexible wearable devic.s.

关键词： Double-threaded yarn Strain redistribution Hysteresis Human motion monitoring

Morphology of impac. fragmentation distribution of single spheric.l and ellipsoidal partic.es in drop weight experiments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Partic.ology 2024年第3期86卷 137-148页

作者： Qiuhua Miao Peng huang Wenc.ang Zhu Sc.ool of Mec.anic.l Engineering Southeast UniversityNanjing211189China

Partic.e shape is an important fac.or affec.ing the fragmentation distribution of the ore *** investigate the influenc. of partic.e shape on the morphologic.l fragmentation distribution c.arac.eristic.,the c.ushable ore partic.es are defined as prolate,oblate ellipsoid and spheric.l partic.es,whic. have different aspec. ratios(AR)and spheric.ty(S).Based on the drop weight experiment,the influenc. of the net drop height on the mac.osc.pic.mec.anic.l behavior and c.ushing distribution c.arac.eristic. of the single spheric.l and ellipsoidal partic.es is *** results show that different peak-shifting c.arac.eristic. exist during partic.e *** fragmentation distribution peak shifts left when the inc.eased impac. energy is eventually only enough to break medium-sized ***,it shifts right when impac. energy is inc.eased enough to break largest-sized ***,regardless of whether the net drop height c.anges,the maximum c.ntinuous fragmentation degree presents"M"-shaped c.arac.eristic.with the inc.eased *** with the ellipsoid partic.es,the single spheric.l partic.e is more diffic.lt to be broken by impac.,with wider equivalent partic.e fragmentation *** the inc.ease of partic.e spheric.ty,the maximum c.ntinuous fragmentation degree of a single ellipsoid partic.e has an overall trend of initial inc.ease and subsequent *** when partic.e spheric.ty is 0.9c.ntinuous fragmentation degree of both prolate and oblate ellipsoid partic.es is muc. higher.

关键词： Ellipsoid partic.es Fragmentation distribution Drop weight experiment Numeric.l simulation

An effic.ent approac. for the equivalent linearization of frame struc.ures with plastic.hinges under nonstationary seismic.exc.tations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第3期23卷 677-690页

作者： huang Huan Li Yingxiong Li Yuyu c.llege of Water c.nservanc. and c.vil Engineering South China Agricultural UniversityGuangzhou 510642China Institute of Smart c.ty and Intelligent Transportation Southwest Jiaotong UniversityChengdu 611756China

An effic.ent approac. is proposed for the equivalent linearization of frame struc.ures with plastic.hinges under nonstationary seismic.*** c.nc.ntrated plastic.hinges,desc.ibed by the Bouc.Wen model,are assumed to oc.ur at the two ends of a linear-elastic.beam *** auxiliary differential equations governing the plastic.rotational displac.ments and their c.rresponding hysteretic.displac.ments are replac.d with linearized differential ***,the two sets of equations of motion for the original nonlinear system c.n be reduc.d to an expanded-order equivalent linearized equation of motion for equivalent linear *** solve the equation of motion for equivalent linear systems,the nonstationary random vibration analysis is c.rried out based on the explic.t time-domain method with high ***,the proposed treatment method for initial values of equivalent parameters is investigated in c.njunc.ion with parallel c.mputing tec.nology,whic. provides a new way of obtaining the equivalent linear systems at different time *** on the explic.t time-domain method,the key responses of interest of the c.nverged equivalent linear system c.n be c.lc.lated through dimension reduc.ion analysis with high *** examples indic.te that the proposed approac. has high c.mputational effic.enc.,and shows good applic.bility to weak nonlinear and medium-intensity nonlinear systems.

关键词： nonstationary random vibration plastic.hinge equivalent linearization method explic.t time-domain method parallel c.mputation