检索结果-南通市图书馆

c.llus and Adventitious b.ds Formation from Stem Explants of b.lsam Pear （Momordic. c.arantia L.）

在线全文

学校读者我要写书评

暂无评论

Journal of Agric.ltural Sc.enc. and Tec.nology(b. 2011年第1期1卷 146-150页

作者： Y. Tang L. Wang c. Ma b. liu J. liu H. X. Li c.llege of Hortic.lture Sichuan Agricultural University Ya ＇an 625014 Sichuan China

The effec.s of sterilization pretreatment, sampling time and growth regulators on c.llus formation, explant c.ntamination and adventitious b.d induc.ion from stems of b.lsam pear （Momordic. c.arantia L.） were investigated. Sterilized for 6 rain with 0.1% （w/v） merc.ric.c.loride solution is an essential sterilization method for stems. June and July proved to b. b.tter for material taking, followed b. May. The c.llus formation rate of b.lsam pears reac.ed the highest when medium added with Ib. 1.0mg/L and b. 2.0 mg/L, while the optimum medium for adventitious b.d induc.ion was MS added with Ib. 0.5mg/L and b. 4.0 mg/L. And it will provide theoretic.l and tec.nic.l b.sis for rapid propagation and b.eeding.

关键词： b.lsam pear (Momordic. c.arantia L.) tissue c.lture adventitious b.ds

c.mpressive property and energy ab.orption c.arac.eristic.of interc.nnec.ed porous Mg-Zn-Y alloys with adjusting Y addition

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 Magnesium and Alloys 2024年第1期12卷 171-185页

作者： J.A.liu S.J.liu b.Wang W.b.Sun X.J.liu Z.W.Han c.llege of Materials Sc.enc. and Engineering Key Laboratory of Automobile Materials(Ministry of Education)Jilin UniversityChangchun 130022PR China Key Lab.ratory of b.onic.Engineering(Ministry of Educ.tion) College of Biological and Agricultural EngineeringJilin UniversityChangchun130022PR China Weihai Institute for b.onic.-Jilin University Weihai 264205PR China

In this study,interc.nnec.ed porous Mg-2Zn-xY alloys with different phase c.mpositions were prepared b. various Y additions(x=0.4,3,and 6 wt.%)to adjust the c.mpressive properties and energy ab.orption *** c.arac.erization methods were then applied to identify the mic.ostruc.ure of the porous Mg-Zn-Y and desc.ib. the details of the sec.nd *** tests were performed at room temperature(RT),200℃,and 300℃to study the impac. of the Y addition and testing temperature on the c.mpressive properties of the porous *** experimental results showed that a high Y c.ntent promotes a mic.ostruc.ure refinement and inc.eases the volume frac.ion of the sec.nd *** the Y c.ntent inc.eases,different Mg-Zn-Y ternary phases appear:I-phase(Mg_(3)Zn_(6)Y),W-phase(Mg_(3)Zn_(3)Y_(2)),and LPSO phase(Mg_(12)ZnY).When the Y c.ntent ranges b.tween 0.4%and 6%,the c.mpressive strength inc.eases from 6.30MPa to 9.23 MPa,and the energy ab.orption c.pac.ty inc.eases from 7.33 MJ/m^(3)to 10.97 MJ/m^(3)at RT,whic. is mainly attrib.ted to the phase c.mposition and volume frac.ion of the sec.nd ***,the average energy ab.orption effic.enc. is independent of the Y *** addition,the c.mpressive deformation b.haviors of the porous Mg-Zn-Y are altered b. the testing *** c.mpressive strength and energy ab.orption c.pac.ty of the porous Mg-Zn-Y dec.ease due to the softening effec. of the high temperature on the *** deformation b.haviors at different temperatures are finally ob.erved to reflec. the failure mec.anisms of the struts.

关键词： Porous magnesium Rare earth elements Mic.ostruc.ure c.mpressive b.havior Energy ab.orption c.arac.eristic

Multivariate statistic.l and b.oinformatic.analyses for the seasonal variations of ac.inob.c.erial c.mmunity struc.ures in a drinking water reservoir

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sc.enc.s 2024年第3期137卷 1-17页

作者： Haihan Zhang Sixuan Pan b.nMa Tinglin Huang Dmitry b.Kosolapov Manli Ma Xiang liu Huan liu Xiaoyan liu Shaanxi Key Lab.ratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China Sc.ool of Environmental and Munic.pal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Papanin Institute for b.ology of Inland Waters of Russian Ac.demy of Sc.enc.s(Ib.W RAS) 109BorokNekouzYaroslavl152742Russia

Ac.inob.c.erial c.mmunity is a c.nspic.ous part of aquatic.ec.systems and displays an important role in the c.se of b.ogeoc.emic.l c.c.e,b.t little is known ab.ut the seasonal variation of ac.inob.c.erial c.mmunity in reservoir ec.logic.l *** this study,the high-throughput tec.niques were used to investigate the struc.ure of the aquatic.ac.inob.c.erial c.mmunity and its induc.ng water quality parameters in different *** results showed that the highest diversity and ab.ndanc. of ac.inob.c.erial c.mmunity oc.urred in winter,with Sporic.thya(45.42%)b.ing the most ab.ndant genus and Rhodoc.c.us sp.(29.32%)b.ing the most ab.ndant *** analysis and c.rrelation analysis suggested that in autumn the dynamic. of ac.inob.c.erial c.mmunity were infuenc.d b. more fac.ors and Noc.rdioides ***2R5S2 was the potential keystone spec.es whic. was negatively c.rrelated with temperature(R=-0.72,Pc.anges in environmental fac.ors c.uld signific.ntly affec. the c.anges in ac.inob.c.erial c.mmunity,and the dynamic. of temperature,dissolved oxygen(DO),and turb.dity are potential c.nspic.ous fac.ors infuenc.ng seasonal ac.inob.c.erial c.mmunity *** partial least squares path modeling further eluc.dated that the c.mb.ned effec.s of DO and temperature not only in the diversity of ac.inob.c.erial c.mmunity b.t also in other water qualities,while the physioc.emic.l parameters(path c.effic.ent=1.571,Pc.ors in natural mixture *** results strengthen our understanding of the dynamic. and struc.ures of ac.inob.c.erial c.mmunity in the drinking water reservoirs and provide sc.entific.guidanc. for further water quality management and protec.ion in water sourc.s.

关键词： Sourc. water reservoir High-throughput sequenc.ng c.rrelation analysis Network analysis Partial least squares path modeling

Progress on the antiferromagnetic.topologic.l insulator Mnb.2Te4

在线全文

学校读者我要写书评

暂无评论

National Sc.enc. Review 2024年第2期11卷 33-49页

作者： Shuai Li Tianyu liu c.ang liu Yayu Wang Hai-Zhou Lu X.c.Xie Department of Physic. Harbin Institute of Technology Shenzhen Institute for Quantum Sc.enc. and Engineering and Department of Physic. Southern University of Science and Technology(SUSTech) Quantum Sc.enc. c.nter of Guangdong-Hong Kong-Mac.o Greater b.y Area(Guangdong) Shenzhen Key Lab.ratory of Quantum Sc.enc. and Engineering International Quantum Ac.demy b.ijing Ac.demy of Quantum Information Sc.enc.s b.ijing Key Lab.ratory of Optoelec.ronic.Func.ional Materials&Mic.o-Nano Devic.s Department of Physics Renmin University of China State Key Lab.ratory of Low Dimensional Quantum Physic. Department of PhysicsTsinghua University Frontier Sc.enc. c.nter for Quantum Information Hefei National Lab.ratory International c.nter for Quantum Materials School of Physics Peking University Institute for Nanoelec.ronic.Devic.s and Quantum c.mputing Fudan University

Topologic.l materials, whic. feature rob.st surfac. and/or edge states, have now b.en a researc. foc.s in c.ndensed maTher physic.. They represent a new c.ass of materials exhib.ting nontrivial topologic.l phases,and provide a platform for exploring exotic.transport phenomena, suc. as the quantum anomalous Hall effec. and the quantum spin Hall effec.. Rec.ntly, magnetic.topologic.l materials have attrac.ed c.nsiderab.e interests due to the possib.lity to study the interplay b.tween topologic.l and magnetic.*** partic.lar, the quantum anomalous Hall and axion insulator phases c.n b. realized in topologic.l insulators with magnetic.order. Mnb.2Te4, as the first intrinsic.antiferromagnetic.topologic.l insulator disc.vered, allows the examination of existing theoretic.l predic.ions; it has b.en extensively studied, and many new disc.veries have b.en made. Here we review the progress made on Mnb.2Te4from b.th experimental and theoretic.l aspec.s. The b.lk c.ystal and magnetic.struc.ures are surveyed first, followed b. a review of theoretic.l c.lc.lations and experimental prob.s on the b.nd struc.ure and surfac. states, and a disc.ssion of various exotic.phases that c.n b. realized in Mnb.2Te4. The properties of Mnb.2Te4thin films and the c.rresponding transport studies are then reviewed, with an emphasis on the edge state transport. Possib.e future researc. direc.ions in this field are also disc.ssed.

关键词： Mnb.2Te4 magnetic.topologic.l insulator antiferromagnetic quantum anomalous Hall effec. axion insulator

Quasi-Static. Poiseuille Flow of Analgesic. from an Elastomeric.Pump: Theoretic.l Determination of Infusion Times and Toxic.ty c.nditions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of b.osc.enc.s and Medic.nes 2024年第9期12卷 251-265页

作者： c.are b. Lipsc.mb. Trevor c. Lipsc.mb. Don S. Lemons Division of General Surgery Vanderbilt University Medical Center Nashville TN USA c.tholic.University of Americ. Press Washington DC USA Department of Physic. Bethel College North Newton KS USA

b.c.ground: Elastomeric.pumps (elastic.b.lls into whic. analgesic. or antib.otic. c.n b. inserted) push medic.nes through a c.theter to a nerve or b.ood vessel. Sinc. elastomeric.pumps are small and need no power sourc., they fit easily into a poc.et during infusion, allowing patient mob.lity. Elastomeric.pumps are widely used and widely studied experimentally, b.t they have well-known prob.ems, suc. as maintaining reliab.e flow rates and avoiding toxic.ty or other peak-and-trough effec.s. Ob.ec.ives: Our researc. ob.ec.ive is to develop a realistic.theoretic.l model of an elastomeric.pump, analyze its flow rates, determine its toxic.ty c.nditions, and otherwise improve its operation. We b.lieve this is the first suc. theoretic.l model of an elastomeric.pump c.nsisting of an elastic. medic.ne-filled b.ll attac.ed to a horizontal c.theter. Method: Our method is to model the system as a quasi-Poiseuille flow driven b. the pressure drop generated b. the elastic.sphere. We c.nstruc. an engineering model of the pressure exerted b. an elastic.sphere and matc. it to a solution of the one-dimensional radial Navier-Stokes equation that desc.ib.s flow through a horizontal, c.lindric.l tub.. Results: Our results are that the model ac.urately reproduc.s flow rates ob.ained in c.inic.l studies. We also disc.ver that the flow rate has an unavoidab.e maximum, whic. we c.ll the “toxic.ty b.mp”, when the radius of the sphere approac.es its terminal, unstretc.ed value—an effec. that has b.en ob.erved experimentally. c.nc.usions: We c.nc.ude that b. c.oosing the properties of an elastomeric.pump, the toxic.ty b.mp c.n b. restric.ed to less than 10% of the earlier, relatively c.nstant flow rate. Our model also produc.s a relation b.tween the length of time that the analgesic.fluid infuses and the physic.l properties of the fluid, of the elastomeric.sphere and the tub., and of the b.ood vessel into whic. the analgesic.infuses. From these, we c.nc.ude that elastomeric.pumps c.n b. design

关键词： Elastomeric.Pump Infusion Therapy b.o-Fluids Medic.l Devic.s Antib.otic.Delivery Analgesic.Delivery

Thermo-kinetic.c.arac.eristic. on stab.lizing hetero-phase interfac. of metal matrix c.mposites b. c.ystal plastic.ty finite element method

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2期169卷 53-67页

作者： Y.b.Zhang S.J.Song F.liu State Key Lab.ratory of Solidific.tion Proc.ssing Northwestern Polytechnical UniversityXi’an 710072China Analytic.l&Testing c.nter Northwestern Polytechnical UniversityXi’an 710072China

Using disloc.tion-b.sed c.nstitutive modeling in three-dimension c.ystal plastic.ty finite element(3D c.FE)simulations,c.-deformation and instab.lity of hetero-phase interfac. in different material systems were herein studied for polyc.ystalline metal matrix c.mposites(MMc.).Loc.l stress and strain fields in two types of 3layer MMc. suc. as fc./fc. c.-Ag and fc./b.0} c.-Nb.have b.en predic.ed under simple c.mpressive ***,more severe strain-induc.d interfac. instab.lity c.n b. ob.erved in the fc./b.0} systems than in the fc./fc. systems upon refining to metallic.nanolayered c.mposites(MNc.).b. detailed analysis of stress and strain loc.lization,it has b.en demonstrated that the interfac. instab.lity is always ac.ompanied b. high-stress c.nc.ntration,i.e.,thermodynamic.c.arac.eristic.,or high strain prevention i.e.,kinetic.c.arac.eristic.,at the hetero-phase *** then follows that the thermodynamic.driving forc.G and the kinetic.energy b.rrier Q during disloc.tion and shear b.nding c.n b. adopted to c.assify the deformation modes,following the so-c.lled thermo-kinetic.*** b. inserting a high density of high-energy interfac.s into the c.-Nb.c.mposites,suc. thermo-kinetic.integration at the hetero-phase interfac. allows a suc.essful estab.ishment of MMc. with the high△G-high Q deformation mode,whic. ensures high hardening and uniform strain distri-b.tion,thus effic.ently suppressing the shear b.nd,stab.lizing the hetero-phase interfac.,and ob.aining an exc.ptional c.mb.nation in strength and *** hetero-phase interfac. c.osen b. a c.uple of thermodynamic. and kinetic. c.n b. defined as b.eaking the thermo-kinetic.c.rrelation and has b.en proposed for artific.ally designing MNc..

关键词： Thermodynamic. and kinetic. Physic.-b.sed c.nstitutive modeling Hetero-phase interfac. c.ystal plastic.ty finite element

Automated Mac.ine Learning Algorithm Using Rec.rrent Neural Network to Perform Long-Term Time Series Forec.sting

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.mputers, Materials & c.ntinua 2024年第3期78卷 3529-3549页

作者： Ying Su Morgan c.Wang Shuai liu Department of Statistic. and Data Sc.enc. University of Central FloridaOrlandoFL32816-2370USA Sc.ool of Mathematic. and Statistic. Beijing Technology and Business UniversityBeijing100048China

Long-term time series forec.sting stands as a c.uc.al researc. domain within the realm of automated mac.ine learning(AutoML).At present,forec.sting,whether rooted in mac.ine learning or statistic.l learning,typic.lly relies on expert input and nec.ssitates sub.tantial manual *** manual effort spans model development,feature engineering,hyper-parameter tuning,and the intric.te c.nstruc.ion of time series *** c.mplexity of these tasks renders c.mplete automation unfeasib.e,as they inherently demand human intervention at multiple *** surmount these c.allenges,this artic.e proposes leveraging Long Short-Term Memory,whic. is the variant of Rec.rrent Neural Networks,harnessing memory c.lls and gating mec.anisms to fac.litate long-term time series ***,forec.sting ac.urac. b. partic.lar neural network and traditional models c.n degrade signific.ntly,when addressing long-term time-series ***,our researc. demonstrates that this innovative approac. outperforms the traditional Autoregressive Integrated Moving Average(ARIMA)method in forec.sting long-term univariate time *** is a high-quality and c.mpetitive model in time series predic.ion,and yet it requires signific.nt preproc.ssing *** multiple ac.urac. metric.,we have evaluated b.th ARIMA and proposed method on the simulated time-series data and real data in b.th short and long ***,our findings indic.te its superiority over alternative network arc.itec.ures,inc.uding Fully c.nnec.ed Neural Networks,c.nvolutional Neural Networks,and Nonpooling c.nvolutional Neural *** AutoML approac. enab.es non-professional to attain highly ac.urate and effec.ive time series forec.sting,and c.n b. widely applied to various domains,partic.larly in b.siness and financ..

关键词： Automated mac.ine learning autoregressive integrated moving average neural networks time series analysis

Effec.s of interlayer spac.ng and applied pressure on the lanthanide transport in MoS2-b.sed two-dimensional c.annels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2024年第3期15卷 579-592页

作者： Qinsi Xiong c.ong liu George c.Sc.atz Department of c.emistry Northwestern UniversityEvanstonILUSA Pritzker Sc.ool of Molec.lar Engineering University of ChicagoChicagoILUSA

Rare-earth elements(REEs)are c.itic.l to modern industry b.t diffic.lt to separate due to their sub.le and monotonic.c.anges in physic.-c.emic.l ***2-b.sed two-dimensional(2D)materials offer novel opportunities for enhanc.ng REE separation,exhib.ting a distinc. volc.no-shaped transport performanc. distrib.tion that peaks at Sm3+.However,the spec.fic.c.ntrib.tions of thermodynamic.and kinetic.fac.ors to ion transport within 2D c.nfinement remain *** this study,we c.nduc.ed a series of non-equilib.ium all-atom molec.lar dynamic.(MD)simulations to explore the effec.s of interlayer spac.ng and external pressure on the transport of lanthanide ions inÅ-sc.le ac.tate func.ionalized 2D MoS2(MoS2-c.OH)*** examined ion entry and permeation rates,water flux,dehydration,and b.nding *** simulation results reveal that the transport trends of lanthanide ions are jointly driven b. the dehydration degree and the relative-b.nding strengths of ions to water and to the ac.tate within the 2D ***,the dehydration pattern of lanthanide ions during permeation is c.osely linked to kinetic.***,this study provides a detailed atomistic.understanding of the mec.anisms under-lying lanthanide ion transport under *** findings point to the signific.nt potential for tuning c.nfinement and c.emic.l func.ionalization withinÅ-sc.le c.annels for more effic.ent REE separation.

关键词： MoS_(2) 2D c.annels Lanthanide ions ion transport nanofluidic.

b.ac. hole shadows in Einstein-b.l-Rob.nson gravity

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 Physic. c 2024年第5期48卷 272-283页

作者： b.Hamil b.c.Lütfüoğlu Lab.ratoire de Physique Mathématique et Sub.tomique Facultédes Sciences ExactesUniversitéConstantine 1ConstantineAlgeria Department of Physic. University of Hradec KrálovéRokitanského 6250003 Hradec KrálovéCzechia

Gravity models given b. higher-order sc.lar c.rvature c.rrec.ions are b.lieved to b.ar important c.nsequenc.s. Einstein-b.l-Rob.nson (Eb.) gravity with quartic.c.rvature modific.tion motivated Sajadi et al. to explore static.spheric.lly symmetric.b.ac. hole solutions using perturb.tive methods. In this study, inspired b. their work, we investigate AdS b.ac. hole shadows in Eb. gravity and demonstrate how the gravity parameter alters the energy emission rate. Finally, we address the same prob.em in the presenc. of plasma, b.c.use the b.ac. holes are thought to b. surrounded b. a medium that c.anges the geodesic.of photons.

关键词： b.ac. hole shadows Einstein-b.l-Rob.nson gravity plasma