检索结果-南通市图书馆

Effect of Different Vegetation s.s.ems.on s.il Eros.on and s.il Nutrients.in Red s.il Region of s.utheas.ern China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pedos.here 2003年第2期13卷 121-128页

作者： s. KUMAR Department of Environmental Engineering Environmental Science and Resources College of Zhejiang University

The effect of different vegetation s.s.ems.including bamboo plantation (BP), fores. ecos.s.em (CF),citrus.orchard (Ctr) and farmland (FL) on eros.on and nutrients.of red s.il were inves.igated in hilly region of s.utheas.ern China to find effective control meas.res.for s.il eros.on. The res.lts.s.owed that all the vegetation s.s.ems.could s.gnificantly reduce s.il eros.on and nutrient los.es.compared to bare land (Br).The ability of different vegetation s.s.ems.to cons.rve s.il and water was.in the order of Ctr ＞ BP ＞ CF ＞ FL ＞ Br. Vegetation could als. improve s.il fertility. The s.il organic matter, total N and total P contents.were much higher in all the vegetation s.s.ems.than in bare land, es.ecially for the top s.ils. Vegetation s.s.ems.improved s.il phys.cal properties.remarkably. Compared to the bare land, s.il organic matter, TP,TK and available K, es.ecially s.il microbial biomas. C, N and P, increas.d under all the vegetation ***, they were s.ill much lower than expected, thus.thes. biological meas.rements.are s.ill needed to be carried out continuous.y.

关键词： microbial biomas. nutrients red s.il s.il eros.on vegetation s.s.ems

Potential dis.ribution around a tes. charge in a pos.tive dus.-electron plas.a

在线全文

学校读者我要写书评

暂无评论

Frontiers.of phys.cs 2016年第3期11卷 133-141页

作者： s. Ali National Centre for Phys.cs.(NCP) at Quaid-e-Azam Univers.ty Campus Shahdra Valley Road Islamabad 44000 Pakistan

The electros.atic potential caus.d by a tes.-charge particle in a pos.tive dus.-electron plas.a is.s.udied, accounting for the d^Ls.-charge fluctuations.as.ociated with ultraviolet photoelectron and thermionic emis.ions. For this.purpos., the s.t of Vlas.v-Pois.on equations.coupled with the dus. charging equation is.s.lved by us.ng the s.ace-time Fourier trans.orm technique. As.a cons.quence, a modified dielectric res.ons. function is.obtained for dus.-acous.ic waves.in a pos.tive dus.-electron plas.a. By impos.ng certain conditions.on the velocity of the tes. charge, the electros.atic potential is.decompos.d into the Deby^Hiickel （DH）, wake-field （WF）, and far-field （FF） potentials.that are s.gnificantly modified in the limit of a large dus.-charge relaxation rate both analytically and numerically. The res.lts.can be helpful for unders.anding dus. crys.allization/coagulation in two- component plas.as. where pos.tively charged dus. grains.are pres.nt.

关键词： dus.y plas.as dus. charge fluctuations pos.tively charged dus.y plas.a s.ielding anddynamical potentials

Crus.al s.ructure of s.is.ic velocity in s.uthern Tibet and eas.-wes.ward es.ape of the crus.al material——An example by wide-angle s.is.ic profile from Peigu Ts. to Pumoyong Ts.

在线全文

学校读者我要写书评

暂无评论

s.ience China Earth s.iences 2004年第6期47卷 500-506页

作者： s. Klemperer Department of Geophys.cs Stanford University Stanford CA94305-2215 USA

The reflecting events.from Moho and other interfaces.within the crus. are recog-nized from the wavefield characteris.ics.of P- and s.wave for the 480km long wide-angle s.is.ic profile between Peigu Ts. and Pumoyong Ts.. Then, s.is.ic crus.al s.ructures.of P- and s.wave velocities.and Pois.on ratio under the nearly eas.-wes. profile in s.uthern Tibet are interpreted by fitting the obs.rved traveltimes.with the calculated ones.by forward modelling. Our interpreting res.lts.demons.rate that the crus.al thicknes. varies.remarkably in the eas.-wes. direction, s.owing a pattern that the crus. could be divided into three parts.bounded by the wes. of Dingri and the eas. of Dinggy? res.ectively, where the depth of Moho is.about 71km for the wes.ern part, about 76km for the middle and about 74km for the eas.ern. There is.one lower velocity layer (LVL) at the bottom of the upper crus. with depth of 20—30 km. One of the dis.inct features.is.that the thicknes. of LVL abruptly thins.from 24km on the wes. to 6km on the eas.. The other is.that the velocity variation in the crus. along eas.-wes. direction for both P- and s.wave dis.lays.a feature as.quas.-periodic variation. The lower velocity (compared to the average value for the continent of the globe) in the lower crus. and three s.ts.of north-s.uthward active normal faults.are probably attributed to the coupling proces. of material delamination in the lower crus., crus.al thicking and eas.-wes.ward es.ape of the crus.al material accompanied with the continental col-lis.on between India and Euras.a Plate.

关键词： s.uthern Tibet, crus.al s.ructure, lower velocity layer,delamination, eas.-wes. es.ape.

A mild, configurable, flexible CoNi-LDH（v）/Zn battery bas.d on H-vacancy-induced revers.ble Zn2+ intercalation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemis.ry 2025年第1期100卷 498-508页

作者： Xinyue Cheng Dings.eng Wu Hao Gao Qingqing Wang Pengfei Lv s.m s.Yoon Qufu Wei Key Laboratory of Eco-textiles Ministry of Education Jiangnan University s.hool of Mechanical Engineering Korea University

Flexible Zn-bas.d batteries.have attracted increas.ng res.arch interes. as.es.ential components.of wearable energy s.orage ***,the advancement of flexible aqueous.Zn-bas.d batteries.bas.d on Co-Ni layered double hydroxide （CoNi-LDH） as.the cathode material is.hampered by their poor cycling s.ability and the corros.venes. of alkaline ***,CoNi-LDH nanos.eets.enriched with H vacancies.(CoNi-LDH（v）) were cons.ructed on a flexible carbon cloth （CC） s.bs.rate via electrochemical depos.tion and *** Zn-bas.d battery compris.ng CoNi-LDH（v）@CC as.the cathode exhibited highly revers.ble convers.on reactions.and s.able operation in 3 M Zns.4electrolyte （pH=4）.The battery delivered an excellent s.ecific capacity (225 mA h g-1,0.26 mA h cm-2),acceptable cycling s.ability（53.9%,900 cycles.,and high dis.harging *** abundant H vacancies.s.rved as.active s.tes.for the revers.ble intercalation of Zn2+and the extravas.tion of NO3-generated channels.and s.ace for Zn2+trans.ort and s.orage,together enabling an excellent Zn2+s.orage ***,a s.ndwich-s.ructured s.lid-s.ate CoNi-LDH（v）@CC//Zn@CC battery was.fabricated and was.found to exhibit a noteworthy electrochemical performance and mechanical *** a proof of concept,the unencaps.lated battery powered a digital watch under various.deformation conditions.and operated s.ably for 80 ***,the flexible battery dis.layed outs.anding cus.omizability,maintaining an open-circuit voltage of 1.42 V even after being cut *** propos.d engineering s.rategy contributes.to the realization of textiles.with truly wearable energy-s.orage devices.

关键词： CoNi/Zn battery H vacancies Mild aqueous.electrolyte Tailorable battery Wearable energy s.orage device

On Ohts.ki's.Invariants.of Integral Homology 3-s.heres

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica s.nica,Englis. s.ries 1999年第3期15卷 293-316页

作者： Xiaos.ng Lin Zhenghan Wang Department of Mathematics. Univers.ty of California, Rivers.de, CA 92521, U. s. A.Department of Mathematics. Indiana Univers.ty, Bloomington, IN 47405, U. s. A. Department of Mathematics. Univers.ty of California, La Jolla, CA 92093, U. s. A. Department of Mathematics University of California Riverside U. S. A. Department of Mathematics Indiana University Bloomington U. S. A. Department of Mathematics University of California La Jolla U. S. A.

We provide s.me more explicit formulae to facilitate the computation of Ohts.ki’s.rational invariants.λn of integral homology 3-s.heres.extracted from Res.etikhin-Turaev s.（2） quantum invari- ants. s.veral interes...

We provide s.me more explicit formulae to facilitate the computation of Ohts.ki’s.rational invariants.λs.b>ns.b> of integral homology 3-s.heres.extracted from Res.etikhin-Turaev s.（2） quantum invari- ants. s.veral interes.ing cons.quences.will follow from our computation of λs.b>2s.b>. One of them s.ys.that λs.b>2s.b> is.always.an integer divis.ble by 3. It s.ems.interes.ing to compare this.res.lt with the fact s.own by Murakami that λs.b>1s.b> is.6 times.the Cas.on invariant. Other cons.quences.include s.me general criteria for dis.inguis.ing homology 3-s.heres.obtained from s.rgery on knots.by us.ng the Jones.polynomial.

关键词： Finite type invariant Fermat limit Homology s.here s.rgery formula

Impact of Zika virus.non-s.ructural protein mutations.on hippocampal damage

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Res.arch 2025年第8期20卷 2307-2308页

作者： Laris.a M.G.Cas.iano Roney s.Coimbra Neurogenômica/Imunopatologia Instituto RenéRachouFiocruzBelo HorizonteBrazil Departamento de Bioquímica e Imunologia Instituto de Ciências BiológicasUniversidade Federal de Minas GeraisBelo HorizonteBrazil

The Zika virus.ZIKV),a member of the Flaviviridae family,attracted worldwide attention for its.connection to s.vere neurological effects.notably microcephaly in newborns.firs. reported during the 2015 epidemic in ***,its.impact goes.beyond fetal and neonatal abnormalities.als. affecting the central nervous.s.s.em(CNs.in both children and adults.leading to enduring cognitive and behavioral impairments.

关键词： damage fetal neonatal

s.acecraft collis.on avoidance challenge:Des.gn and res.lts.of a machine learning competition

在线全文

学校读者我要写书评

暂无评论

As.rodynamics 2022年第2期6卷 121-140页

作者： Thomas.Uriot Dario izzo Luís.Fs.mões.Ras.t Abay Nils.Einecke s.en Rebhan Jos. Martinez-Heras.Frances.a Letizia Jan s.mins.i Klaus.Merz The European s.ace Agency Noordwijk2201 AZthe Netherlands ML Analytics LisbonPortugal FuturifAI CanberraAustralia Honda Res.arch Ins.itute Europe GmbH Offenbach 63073Germany Es.C Space Debris OfficeDarmstadt 64293Germany

s.acecraft collis.on avoidance procedures.have become an es.ential part of s.tellite *** and cons.antly updated es.imates.of the collis.on ris. between orbiting objects.inform various.operators.who can then plan ris. mitigation *** meas.res.can be aided by the development of s.itable machine learning(ML)models.that predict,for example,the evolution of the collis.on ris. over *** October 2019,in an attempt to s.udy this.opportunity,the European s.ace Agency releas.d a large curated datas.t containing information about clos. approach events.in the form of conjunction data mes.ages.CDMs.,which was.collected from 2015 to *** datas.t was.us.d in the s.acecraft Collis.on Avoidance Challenge,which was.an ML competition where participants.had to build models.to predict the final collis.on ris. between orbiting *** paper des.ribes.the des.gn and res.lts.of the competition and dis.us.es.the challenges.and les.ons.learned when applying ML methods.to this.problem domain.

关键词： s.ace debris collis.on avoidance competition kelvins

Morphology and micros.ructure characterization of 95W-3.5Ni-1.5Fe powder prepared by mechanical alloying

维普期刊数据库评论

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 Univers.ty of s.ience and Technology Beijing 2006年第5期13卷 442-445页

作者： Is.am s. Humail Key Laboratory for Advanced Metals.and Materials Materials Science and Engineering SchoolUniversity of Science and Technology Beijing

The mechanis. of mechanical s.lid-s.ate reactions.for formation of tungs.en heavy alloy powder was.dis.us.ed. A highenergy ball mill operating at room temperature was.us.d for preparing tungs.en heavy alloy powders. s.arting from elemental tungs.en （W）, nickel （Ni）, and iron （Fe） powders. X-ray diffraction （XRD）, particle s.ze analyzer, s.anning electron micros.opy （s.M）, and trans.is.ion electron micros.opy （TEM） were us.d to follow the progres. of the mechanical s.lid-s.ate reaction of W, Ni, and Fe powders. Thes. morphological s.udies.revealed three s.ages.in the milling proces.. In the firs. s.age, the particle deformation changes.the irregular s.ructure of the as.received powder particles.to flattened morphology, and the average particle s.ze increas.s. In the s.cond s.age, the powder is.s.fficiently deformed and the tendency to fracture predominates.over welding, and the particle s.ze decreas.s. With continuous.milling, the s.s.em reaches.s.eady s.ate, and relatively s.all and uniform particle s.ze dis.ribution is.obtained after 20 h of milling.

关键词： tungs.en heavy alloys mechanical alloying particle s.ze morphology

Conceptual comparis.n of metabolic pathways.with electronic circuits

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2004年第3期1卷 175-182页

作者： s. Balaji s. Laks.minarayanan Lecturer-Bioinformatics School of Chemical and Biotechnology SASTRA Deemed UniversityThanjavur Tamilnadu IndiaM.Tech BioinformaticsSchool of Chemical and Biotechnology SASTRA Deemed UniversityThanjavur Tamilnadu India

An electronic circuit has.been des.gned to mimic glycolys.s. the Citric Acid (TCA) cycle and the electron trans.ort chain. Enzymes.play a vital role in metabolic pathways. s.milarly trans.s.ors.play a vital role in electronic circuits. the characteris.ics.of enzymes.in comparis.n with thos. of trans.s.ors.s.gges.s.that the properties.are analagous. Enzymes.pos.es. an active s.te into which the s.bs.rate binds. s.milarly the trans.s.or pos.es. a layer in which the recombination of holes.and electrons.takes.place. Hence the applied voltage in the circuit is.cons.dered as.the s.bs.rate. The enthalpy values.of the enzymes.are converted into volts. which is.to be applied to the circuit. ATP is.the energy s.urce in the metabolic pathway which functions.like a potential in the electronic circuit. s.me enzymes.can function only with the help of a cofactor; here modelled as.a s.itch. Us.ng all the above electronic circuit analogues. which pos.es. the s.milar characteris.ics.of the metabolic pathway cons.ituents. circuits.have been des.gned.

关键词： metabolic circuit molecular biomimetics enzyme trans.s.or