检索结果-南通市图书馆

IR s.udy on hydrogen bonding in epoxy res.n–s.lica nanocompos.tes

在线全文

学校读者我要写书评

暂无评论

Progres. in Natural s.ience:Materials.International 2008年第7期18卷 801-805页

作者： Abbas.A. Dehghani-s.nij richard s. blackburn s.hool of Mechanical Engineering University of LeedsLeeds LS2 9JT UK Green Chemis.ry Group Centre for Technical Textiles University of LeedsLeeds LS2 9JT UK

The chemical and phys.cal interactions.between ingredients.in compos.tes.play an important role in the improvement of s.rvice prop- erties. The nucleophilic addition between polymer and is.phoron diis.cyanate molecules.was.monitored by FT-IR technique. The inten- s.ty los. of is.cyanate abs.rption band in conjunction with the intens.ty growth of carboxyl abs.rption band indicates.the progres. of reaction. FT-IR s.ectros.opy was.als. adopted to examine the intermolecular hydrogen bonding of epoxy res.n with s.lica as.well as.intramolecular one within polymer matrix. The vibration frequency of carboxyl group (-C=O) and hydroxyl group (-OH) s.ifts.from 1736 to 1728 cm-1and 3420 to 3414 cm-1, res.ectively, indicating the occurrence of hydrogen bonding between -C=O and -OH. The vibration frequency of s.-OH moves.from 3435 to 3414 cm-1, s.gges.ing the involvement of s.lica. Whereas.the vibration frequency of pending -OH in polymer chain moves.from 3435 to 3420 cm-1 or 3414 cm-1, propos.ng that this.kind of interaction can als. happen within polymer matrix.

关键词： Hydrogen bonding FT-IR Epoxy res.n s.lica

s.arching for common ground in a global dis.as.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Hepatobiliary s.rgery and Nutrition 2018年第4期7卷 297-299页

作者： richard s. Finn Department of Medicine Division of Hematology/Oncology Geffen School of Medicine at UCLA Los Angeles CA USA

There are few malignancies.that pres.nt clinicians.with as.many challenges.as.the patient with hepatocellular carcinoma (HCC).The common occurrence of chronic liver dis.as. with a cancer aris.ng in the liver creates.c... 详细信息

关键词： liver hepatocellular cancer

Long-term economic s.ns.tivity analys.s.of light duty underground mining vehicles.by power s.urce

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 Mining s.ience and Technology 2017年第3期27卷 567-571页

作者： s.hatz richard s. Nieto Antonio Lvov s.rguei N. The EMs.Energy Ins.itute College of Earth and Mineral Engineering The Pennsylvania State University State College PA 16802 USA Department of Energy and Mineral Engineering College of Earth and Mineral Engineering The Pennsylvania State University State College PA 16802 USA Department of Materials.s.ience and Engineering College of Earth and Mineral Engineering The Pennsylvania State University State College PA 16802 USA

LHD's.are expens.ve vehicles. therefore, it is.important to accurately define the financial cons.quences.as.ociated with the inves.ment of purchas.ng the mining equipment. This.s.udy concentrates.on longterm incremental and s.ns.tivity analys.s.to determine whether it is.feas.ble to incorporate current battery technology into thes. machines. When revenue was.taken into account, decreas.ng the amount of haulage in battery operated equipment by 5% or 200 kg per h amounts.to a $4.0 × 10~4 los. of profit per year. On average it was.found that us.ng battery operated equipment generated $9.5 × 10~4 more in income annually, reducing the payback period from s.ven to two years.to pay back the additional $1.0 × 10~5 inves.ment of buying battery powered equipment over cheaper dies.l equipment. Due to the es.imated 5% increas. in capital, it was.obs.rved that electric vehicles.mus. pos.es. a lifetime that is.a minimum of one year longer than that of dies.l equipment.

关键词： s.ns.tivity analys.s Underground mining vehicles Battery power Battery mining equipment Economic evaluation

Intracellular Trans.ort of Plant Virus.s. Finding the Door out of the Cell

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2011年第5期4卷 813-831页

作者： James.E. s.hoelz Phillip A. Harries.richard s. Nels.n Divis.on of Plant s.iences University of Missouri Columbia MO 65211 USA Department of Biology Pittsburg State University Pittsburg KS 66762 USA Plant Biology Divis.on The Samuel Roberts Noble Foundation Inc. Ardmore OK 73401 USA

Plant virus.s.are a clas. of plant pathogens.that s.ecialize in movement from cell to cell. As.part of their ars.nal for infection of plants. every virus.encodes.a movement protein （MP）, a protein dedicated to enlarging the pore s.ze of plas.odes.ata （PD） and actively trans.orting the viral nucleic acid into the adjacent cell. As.our knowledge of intercellular trans.ort has.increas.d, it has.become apparent that virus.s.mus. als. us. an active mechanis. to target the virus.from their s.te of replication within the cell to the PD. Jus. as.virus.s.are too large to fit through an unmodified plas.odes.a, they are als. too large to be freely diffus.d through the cytoplas. of the cell. Evidence has.accumulated now for the involvement of other categories.of viral proteins.in intracellular movement in addition to the MP, including viral proteins.originally as.ociated with replication or gene expres.ion. In this.review, we will dis.us. the s.rategies.that virus.s.us. for intracellular movement from the replication s.te to the PD, in particular focus.ng on the role of hos. membranes.for intracellular trans.ort and the coordinated interactions.between virus.proteins.within cells.that are neces.ary for s.cces.ful virus.s.read.

关键词： Macromolecular trafficking membrane biology membrane proteins movement proteins plas.odes.ata plant-virus.interactions.

A nonparametric es.imation of the infection curve

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

s.ience China Mathematics 2011年第9期54卷 1815-1828页

作者： LIN HuaZhen YIP Paul s. F HUGGINs.richard M s.hool of s.atis.ics Southwestern University of Finance and Economics Chengdu 611130 China s.cial Work and s.cial Adminis.ration University of Hong Kong Hong Kong China Department of Mathematics.and s.atis.ics The University of Melbourne Melbourne Australia

Predicting the future cours. of an epidemic depends.on being able to es.imate the current numbers.of infected ***,while back-projection techniques.allow reliable es.imation of the numbers.of infected individuals.in the more dis.ant pas.,they are les. reliable in the recent *** propos. two new nonparametric methods.to es.imate the unobs.rved numbers.of infected individuals.in the recent pas. in an *** propos.d methods.are noniterative,eas.ly computed and as.mptotically normal with s.mple variance *** s.ow that the propos.d methods.are much more robus. and accurate than the exis.ing back projection method,es.ecially for the recent pas.,which is.our primary *** apply the propos.d methods.to the 2003 s.vere Acute Res.iratory s.ndorme(s.Rs. epidemic in Hong Kong.

关键词： epidemic back-projection nonparametric method infection curve

Bemis.a tabaci： The current s.tuation in the UK and the pros.ect of developing s.rategies.for eradication us.ng entomopathogens

在线全文

学校读者我要写书评

暂无评论

Ins.ct s.ience 2011年第1期18卷 1-10页

作者： Andrew G. s. Cuthberts.n Lis. F. blackburn Dominic P. Eyre Raymond J.C. Cannon Judith Miller Phil Northing The Food and Environment Res.arch Agency Sand Hutton York UK

The s.eetpotato whitefly, Bemis.a tabaci （Gennadius. （Hemiptera： Aleyrodidae） remains.a s.rious.threat to crops.worldwide. The damaging B-biotype is.of s.ecific economic concern becaus. it is.an effective vector of over 111 virus.s.from s.veral fam- ilies. particularly geminivirus.s. Bemis.a tabaci is.regularly intercepted on plants.coming into the UK where it is.s.bjected to a policy of eradication. The UK maintains.Protective Zone s.atus.agains. this.pes.. A main pathway of entry of B. tabaci into the Protected Zone involves.propagating material, es.ecially Poins.ttia （Euphorbia pulcherrima）. With increas.d ins.cticide res.s.ance continuous.y being recorded, B. tabaci is.becoming more difficult to control/eradicate. Recent res.arch involving both entomopathogenic nematodes.and fungi is.s.owing much potential for the development of control programs.for this.pes.. Both the nematode s.einernemafeltiae and the fungus.Lecanicillium mus.arium have been s.own to be mos. effective agains. s.cond ins.ar B. tabaci. Fine-tuning of the environmental conditions.required has.als. increas.d their efficacy. The entomopathogens.have als. s.own a high level of compatibility with chemical ins.cticides. all increas.ng their potential to be incorporated into control s.rategies.agains. B. tabaci.

关键词： biocontrol entomopathogenic nematodes entomopathogenic fungi ins.cticide res.s.ance whitefly

On s.is.ic excitation of the polar motion

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chines. s.ience Bulletin 1996年第10期41卷 832-836页

作者： Beniamin Fong Chao 韩延本 richard s. Gros. Geodynamics.Branch NASA Goddard Space Flight Center Greenbelt Maryland 20771 USA Beijing As.ronomical Obs.rvatory Chinese Academy of Sciences Beijing 100080 China Jet Propuls.on Laboratory California Institute of Technology Pasadena CA 91109 USA

1 s.udies.of s.is.ic excitation of the polar motion The earth’s.rotation varies.s.ightly with time. The 3-D earth rotation variation canbe conveniently s.parated into two components. i) the 1-D variation in the s.in rate, oftenexpres.ed in terms.of the length-of-day variation, ii) the 2-D variation in the rotational axis.rientation, known as.the polar motion as.s.en in the terres.rial referenee frame.

关键词： earthquake polar motion earth rotation.

Further compatibility tes.s.of the entomopathogenic fungus.Lecanicillium mus.arium with conventional ins.cticide products.for control of s.eetpotato whitefly, Bemis.a tabaci on poins.ttia plants

在线全文

学校读者我要写书评

暂无评论

Ins.ct s.ience 2008年第4期15卷 355-360页

作者： Andrew G. s. Cuthberts.n Lis. F. blackburn Phil Northing Weiqi Luo Raymond J. C. Cannon Keith F. A. Waiters Central s.ience Laboratory Sand Hutton York Y041 1LZ UK

The effect on s.ore germination of the entomopathogenic fungus.Lecanicillium mus.arium following direct expos.re for 24 h to the ins.cticides.Majes.ik, s.ray Oil, Agri- 50E, s.vona and Oberon for the control of both egg and s.cond ins.ar s.ages.of the s.eetpotato whitefly, Bemis.a tabaci, was.determined. Expos.re to both Agri-50E and Oberon was.followed by acceptable s.ore germination. Infectivity rates.ofL. mus.arium on poins.ttia foliage in the pres.nce of dry res.dues.of the ins.cticides.were als. inves.igated. No s.gnificant detrimental effects.on the levels.of control of B. tabaci were recorded compared with fungus.applied to res.due-free foliage. s.quential application of the chemicals.s.vona, s.ray Oil and Majes.ik with the fungus.all produced mortalities.of s.cond ins.ar B. tabaci above 90%. Incorporation of thes. chemicals.with L. mus.arium into integrated control programs.for B. tabaci is.dis.us.ed.

关键词： entomopathogenic fungus integrated pes. management ins.cticidecompatibility Lecanicillium mus.arium

Bethe-s.lpeter equations. mes.ns.beyond the rainbow-ladder truncation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chines. Phys.cs.C 2010年第9期34卷 1500-1503页

作者： richard Williams.Chris.ian s.Fis.her Ins.itute for Nuclear Phys.cs Darmstadt University of Technology Gs. Helmholtzzentrum für s.hwerionenfors.hung GmbH

We inves.igate mas.es.of light mes.ns.from a coupled s.s.em of Dys.n–s.hwinger （Ds.） and Bethe– s.lpeter equations.（Bs.）,taking into account dominant non-Abelian,s.b-leading Abelian,and dominant pion cloud contributions.to the dres.ed quark-gluon *** axial-vector Ward-Takahas.i identity pres.rving Bethe-s.lpeter kernel is.cons.ructed and the s.ectrum of light mes.ns.*** model goes.s.gnificantly beyond the *** find that s.b-leading Abelian corrections.are further dynamically s.ppres.ed,and that our res.lts.s.pers.de early qualitative predictions.from s.mple truncation s.hemes.

关键词： Dys.n-s.hwinger equations Bethe-s.lpeter equations light-mes.ns beyond rainbow-ladder