检索结果-南通市图书馆

Pedosph.re 2011年第1期21卷 46-55页

作者： D. A. Ch.N x. h. fan Y. C. LI Department of Civil and Environmental Engineering University of Miami Coral Gables FL 33124 (USA) Tropical Research.and Education Center Soil and Water Science Department University of Florida Homestead FL 33031 (USA)

Th. Soil and Water Assessment Tool(SWAT) h.s been widely used th.ough.ut th. world to model crop growth.and nutrient uptake in various types of soils.A greenh.use ex.eriment was performed to validate th. process equations embedded in SWAT for describing th. growth.and nutrient uptake of tomatoes in south.*** scaled growth.curve of greenh.use-grown tomatoes was in close agreement with.th. th.oretical model for field conditions,with.th. scaling factors being th. max.mum canopy h.igh. and th. potential h.at ***,th. scaled leaf area index.LAI) growth.curve and th. scaled root depth.curve for greenh.usegrown tomatoes agreed with.th. SWAT functions,with.th. scaling factors being th. max.mum LAI and max.mum root *** greenh.use ex.eriment confirmed th.t th. growth.of biomass is a linear function of th. intercepted ph.tosynth.tically active *** fractions of nutrients in th. plant biomass under greenh.use conditions were found to be on th. order of 60% of th.se fractions observed in th. *** of th. initial P distribution(0.2 mg kg -1),initial ratio of mineral stable P to mineral active P(50:1),and initial ratio of h.mic N to h.mic P(2.4:1) were determined from soil measurements and can be used for field *** conventional saturation-ex.ess model for soil-water percolation was used to predict th. movement of water in th. top 10 cm of th. greenh.use containers and th. results agreed well with.measurements.

关键词： container plants crop modeling Krome soil nitrogen ph.sph.rus

维普期刊数据库

Th. Optimal Sensing Coverage for Road Surveillance

在线全文

学校读者我要写书评

暂无评论

Wireless Sensor Network 2010年第4期2卷 318-327页

作者： x. F. Ch.ng P. Liu Z. G. Ch.n h. B. Wu x. h. fan 不详

So far path.coverage problem h.s been studied widely to ch.racterize th. properties of th. coverage of a path.or a track in an area induced by a sensor network, in wh.ch.th. path.or track is usually treated as a curve and th. width.of it can be ignored. h.wever, sensor networks often are employed to carry out road surveillance or target tracking, in wh.ch.th. interesting area is only th. surface of th. road, th.s th. width.of th. road must be considered. Th.s paper analyzes th. optimal sensing coverage of th. road in th.s kind of applications, assuming th.t sensor nodes are deployed along both.sides of th. road determinately. Th. optimal position of sensor nodes is studied considering th. sensing range of sensors and th. width.of th. road, and th. purpose is to cover th. road surface completely with.minimal nodes. Th. isosceles triangle model is proposed and proved to be th. most suitable, th.t is to say all sensors get th. max.mal available sensing area if any th.ee nearest sensors located on both.sides of th. road form an isosceles triangle. Comparing with.th. equilateral triangle model proposed in oth.r articles, th.s model increases th. coverage rate and supplies complete coverage of th. road.

关键词： Sensor Network Optimal Coverage Road

Tackling th. microlensing wave effects of strong lensing gravitational waves with.TAAh

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Ch.na(Ph.sics,Mech.nics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 257-258页

作者： Zuh.i fan South.Western Institute for Astronomy Research Yunnan University

Th. rapid development of gravitational wave（GW） observations since th.ir first detection in 2015 [1] h.s opened a completely new window for ex.loring th. Universe. Consequently, astronomical research.h.s entered th. multimessenger era, allowing us to use different tracers to view th. cosmos from various perspectives. Among oth.rs, th. appealing application of gravitational wave events from compact binary mergers is th.t th.y can act as standard sirens to determine absolute cosmic distances entirely independent of standard candles. Th.s approach.is one of th. most promising means to solve th. current h.tension problem.

关键词：

Macro-mech.nics and Microstructure of Nanomaterial-modified Geopolymer Concrete: A Compreh.nsive Review

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 Wuh.n University of Tech.ology(Materials Science) 2025年第1期40卷 204-214页

作者： WANG Tao fan x.angqian GAO Ch.ngsh.ng QU Ch.yu Th. National Key Laboratory of Water Disaster Prevention Nanjing Hydraulic Research InstituteNanjing 210024China South.rn Marine Science and Engineering Guangdong Laboratory(Guangzh.u) Guangzhou 511458China Sch.ol of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou 450001China

We h.ve described in detail th. effects of nano-SiO_(2),nano-CaCO_(3),carbon nanotubes,and nano-Al_(2)O_(3) on geopolymer concrete from th. perspectives of macro mech.nics and *** ex.sting research.results sh.w th.t th. mech.nism of nano-materials on geopolymer concrete mainly includes th. filling effect,nucleation effect,and bridging effect,th. appropriate amount of nano-materials can be used as fillers to reduce th. porosity of geopolymer concrete,and can also react with.Ca(Oh.2 to produce C-S-h.gel,th.reby improving th. mech.nical properties of geopolymer *** optimum content of nano-SiO_(2) is between 1.0%and 2.0%.Th. optimum content of nano-CaCO_(3) is between 2.0%and 3.0%.Th. optimum content of carbon nanotubes is between 0.1%and 0.2%.Th. optimum content of nano-Al_(2)O_(3) is between 1.0%and 2.0%.Th. main problems ex.sting in th. research.and application of nanomaterial-modified geopolymer concrete are summarized,wh.ch.lays a foundation for th. furth.r application of nanomaterial in geopolymer concrete.

关键词： nanomaterials low carbon geopolymer concrete macro-mech.nics microstructure

Electronic and magnetic structures of ch.in structured ironselenide compounds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of ph.sics 2014年第4期9卷 465-471页

作者： Wei Li Ch.ndan Setty x. h. Ch.n Jiangping h. State Key Laboratory of Functional Materials for Informatics and Sh.ngh.i Center for Superconductivity Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Department of Ph.sics and State Key Laboratory of Surface Ph.sics Fudan University Shanghai 200433 China Department of Ph.sics Purdue University West Lafayette IA 47907 USA h.fei National Laboratory for Ph.sical Science at Microscale and Department of Ph.sics University of Science and Technology of China Hefei 230026 China Beijing National Laboratory for Condensed Matter Ph.sics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Electronic and magnetic structures of iron selenide compounds Ce2O2FeSe2 （2212＊） and BaFe2Se3 （123＊） are studied by th. first-principles calculations. We find th.t wh.le all th.se compounds are composed of one-dimensional （1D） Fe ch.in （or ladder） structures, th.ir electronic structures are not close to be quasi-lD. Th. magnetic ex.h.nge couplings between two nearest-neigh.or （NN） ch.ins in 2212＊ and between two NN two-leg-ladders in 123＊ are both.antiferromagnetic （AFM）, wh.ch.is consistent with.th. presence of significant th.rd NN AFM coupling, a common feature sh.red in oth.r iron-ch.lcogenides, FeTe （11＊） and KyFe2-x.e2 （122＊）. In magnetic ground states, each.Fe ch.in of 2212＊ is ferromagnetic and each.two-leg ladder of 123＊ form a block-AFM structure. We suggest th.t all magnetic structures in iron-selenide compounds can be unified into an ex.ended J1-J2-J3 model. Spin-wave ex.itations of th. model are calculated and can be tested by future ex.eriments on th.se two systems.

关键词： first-principles calculations magnetism spin-wave ex.itations

MOF-derived ZrO_(2)/C-polyvinylidene fluoride composite towards negative permittivity regulation mech.nism

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 Science & Tech.ology 2024年第12期179卷 50-56页

作者： x.T.Song G.h.fan Y.Liu R.h.fan Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Jinan 250061China Institute of Advanced Electrical Materials Qingdao University of Science&TechnologyQingdao 266042China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306China

Composites featuring negative permittivity h.ve garnered significant attention for th.ir potential in novel capacitance designs,coil-less electrical inductors,and electromagnetic sh.elding *** th.s study,we prepared polyvinylidene fluoride(PVDF)matrix.composites filled with.ZrO_(2)/C nanoparticles de-rived from metal-organic frameworks(MOFs)via a h.t-pressing *** an increase in th. ZrO_(2)/C content to 30 wt.%,electrical percolation was observed,accompanied by a transition mech.nism from h.pping conduction to metal-like *** enabled th. realization of ZrO_(2)/C/PVDF composites with.tailorable negative permittivity properties,attributed to th. plasmonic oscillation of free electrons in th. composites beyond th. percolation th.esh.ld(30 wt.%).Furth.rmore,th. permittivity transition along to a sh.ft in th. electrical beh.vior of th. percolative composites from capacitive to *** ex.lored th. regulatory mech.nism beh.nd th. negative permittivity in th.s random composite system,and our findings h.gh.igh. th. potential of th.se tunable negative permittivity media as promising candi-dates for diverse electromagnetic applications.

关键词： Negative permittivity Electrical properties Plasma oscillation Polymeric composites

A micromech.nical model based on h.persingular integro-differential equations for analyzing micro-crazed interfaces between dissimilar elastic materials

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Math.matics and Mech.nics(English.Edition) 2020年第2期41卷 193-206页

作者： x.WANG W.T.ANG h.fan Sch.ol of Mech.nical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Th. current work models a weak(soft) interface between two elastic materials as containing a periodic array of micro-crazes. Th. boundary conditions on th. interfacial micro-crazes are formulated in terms of a system of h.persingular integro-differential equations with.unknown functions given by th. displacement jumps across opposite faces of th. micro-crazes. Once th. displacement jumps are obtained by approx.mately solving th. integro-differential equations, th. effective stiffness of th. micro-crazed interface can be readily computed. Th. effective stiffness is an important quantity needed for ex.ressing th. interfacial conditions in th. spring-like macro-model of soft interfaces. Specific case studies are conducted to gain ph.sical insigh.s into h.w th. effective stiffness of th. interface may be influenced by th. details of th. interfacial micro-crazes.

关键词： micromech.nical modeling micro-crazed interface effective stiffness coefficient h.persingular integro-differential equation

维普期刊数据库

A surface engineering strategy for th. stabilization of zinc metal anodes with.montmorillonite layers toward long-life rech.rgeable aqueous zinc ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Ch.mistry 2025年第1期100卷 94-105页

作者： Wenbo Wang Ruifeng x. x. Zh.ng Peiyu Wang Bao Yang Bingjun Yang Juan Yang Kailimai Su Pengjun Ma Yanan Deng x.anfeng fan Wanjun Ch.n Key Laboratory for Electronic Materials College of Electrical Engineering Northwest Minzu University Resource Ch.mistry and Energy Materials Research.Center State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute for Materials and Processes School of Engineering University of Edinburgh

Rech.rgeable aqueous zinc-ion batteries （AZIBs） ex.ibit appreciable potential in th. domain of electroch.mical energy ***,th.re are serious ch.llenges for AZIBs,for instance zinc dendrite growth.h.drogen evolution reaction （h.R）,and corrosion side ***,we propose a surface engineering modification strategy for coating th. montmorillonite （MMT） layer onto th. surface of th. Zn anode to tackle th.se issues,th.reby ach.eving h.gh.cycling stability for rech.rgeable *** results reveal th.t th. MMT layer on th. surface of th. Zn anode is able to provide ordered zincoph.lic ch.nnels for zinc ions migration,facilitating th. reaction kinetics of zinc *** functional th.ory（DFT） calculations and water contact angle （CA） tests prove th.t MMT@Zn anode ex.ibits superior adsorption capacity for Zn2+and better h.droph.bicity th.n th. bare Zn anode,th.reby ach.eving ex.ellent cycling ***,th. MMT@Zn||MMT@Zn symmetric cell h.lds th. stable cycling over 5600 h.at 0.5 mA cm-2and 0.125 m A h.cm-2,even ex.eeding 1800 h.long cycling under h.rsh.conditions of 5 m A cm-2and 1.25 m A h.*** MMT@Zn||V2O5full cell reach.s over 3000 cycles at 2 A g-1with.ex.ellent rate ***,th.s surface engineering modification strategy for enh.ncing th. electroch.mical performance of AZIBs represents a promising application.

关键词： h.drogen evolution reaction

Trimetallic mesoporous PdCuRu for efficient formate electrosynth.sis from polyeth.lene tereph.h.late recycling

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Ch.na Ch.mistry 2025年

作者： Yuting Li h.iqin Yao Lizh. Sun Sh. h.n x.aox.ang x. Guangyin fan Ben Liu College of Ch.mistry and Materials Science Sichuan Normal University Key Laboratory of Green Ch.mistry and Tech.ology of Ministry of Education College of Chemistry Sichuan University Sch.ol of Basic Medical Sciences Ningxia Medical University Department of Otorh.nolaryngology-h.ad and Neck Surgery Zhongnan Hospital of Wuhan University

Electroch.mical recycling of waste polyeth.lene tereph.h.late（PET） plastics represents a green and sustainable route to produce valuable fuels and address serious environmental issues. Despite some encouraged ach.evements, th.ir progress is still slower because of th. lack of h.gh.y active and selective electrocatalysts. h.re, we reported an efficient PET recycling route with.trimetallic PdCuRu mesoporous nanosph.res（MSs） as a h.gh.performance electrocatalyst th.t ach.eved selective electrosynth.sis of valuable formate from PET h.drolysate（PETh. electroox.dation. Penetrated metal mesopores and trimetallic compositions of PdCuRu MSs synergistically optimized electronic structures of Pd sites and ch.nged ch.misorption properties of intermediates, wh.ch.disclosed a h.gh.formate Faradic efficiency of 97% and impressive yield rate of 0.49 mmol h.1cm-2in an alkaline solution. Meanwh.le, th.s electrocatalyst h.ld good electrocatalytic stability, retaining h.gh.formate Faradic efficiency and yield rate even being performed for 10 cycles, wh.ch.h.gh.igh.ed its potential applications for practical PET recycling. Our study provides a powerful strategy for designing h.gh.performance electrocatalysts toward selective electro-synth.sis of valuable fuels from various waste plastics.

关键词：

Co@C-N as an electronic mediator anch.red with.Cu2O nanoparticles enables efficient ph.toreduction of CO2 to CO with.nearly 100% selectivity

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Ch.na Ch.mistry 2025年

作者： x.ngbin Pan x.uzh.ng Deng Jingsh.n fan Jiangch.an Liu Ch.ngh.i Liu Zh.ngyu Li Qian Liang Jiangsu Key Laboratory of Advanced Catalytic Materials and Tech.ology CNPC-CZU Innovation Alliance School of Petrochemical Engineering Changzhou University Sch.ol of Materials Science & Engineering Changzhou University

Solar-driven CO2conversion into value-added ch.mical provides an attractive strategy for sustainable development. h.wever,th. enh.nced CO2ph.toreduction performance with.target product selectivity remains a major ch.llenge. h.re, we develop a novel strategy involving Cu2O nanoparticles in situ grown on th. surface of ZIF-67-derived Co@C-N nanocages （CC） to create abundant active sites and appropriate h.terointerfaces. A remarkable CO selectivity of 95.7%with.a yield of 117.39μmol g-1h.1and an apparent quantum efficiency as h.gh.as 1.88%at 420 nm was obtained over CC-60 catalyst in pure water, wh.ch.was 87.6times h.gh.r th.n th.t of pure Cu2O. Th.oretical calculations and ex.eriments indicated th.t Co@C-N nanocages as ch.rge mediator not only rapidly trap ph.togenerated electrons to promote ch.rge separation efficiency, but also regulate th. d-band center of Cu atoms to move to th. Fermi energy level, th.reby optimizing th. reaction kinetics to facilitate th. h.gh.y selective conversion of th. key intermediate *CO desorption to CO.

关键词：