简介：Thecommoncoldistheworld'smostwidespreadillness,whichisaplague(疫病)thatfleshreceives.

简介：某些动词如:catch,have,get.take等与cold连用,表示感冒、伤风、着凉之意。有时cold前带a.有时不带a.有时可带可不带.为了弄清楚这些关系,现归纳如下。一、动词have,get与cold连用,要加a.表示状态.可与表示延续性时间状语连用。例如:1)Hehashad(got)acoldfordays.2)I’vegot(had)acoldsincemyarrival.二、动词take与cold连用,不加a。例如:1)Youusedtotakecold,usedn’tyou?2)XiaoLiuisn’tstrongenough.Sheeasilytakescolds三、动词catch与cold连用,a可有可无。例如:Putonyourcoat,oryou’llcatch(a)cold.

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简介：Whilethehumanracehasaccomplishedmanyamazingfeats,curingthecommoncoldhasnotbeenoneofthem.Evenafterhundredsofyearsofresearch,scientistsstillcannotstompoutthetinybug.

简介：日本松锯工，Monochamusalternatus，一个重要的松森林害虫和向量正在播送松枯萎原因消瘦的线虫枯萎疾病。在秋天，冬季和春天的低温度经常差别影响M的死亡。alternatus幼虫。在这篇论文，我们主要比较了死亡并且从不同季节的幼虫的冷变硬的差别，基于supercooling点(SCP)和个人结冰的累积概率(CPIF)。从秋天，冬季和春天季节的幼虫的冷变硬大部分是不同的。在秋天和春天幼虫的死亡和CPIF之间的关联在天1/4上是最高的，并且逐渐地与延长暴露持续时间减少了。这甲壳虫的死亡主要源于在短暴露持续时间结冰。然而，在冬季幼虫的死亡和CPIF之间的关联与延长暴露持续时间逐渐地增加了。死亡主要没源于在长暴露持续时间结冰。秋天幼虫比冬季和春天幼虫更易受影响、能适应。冬季幼虫有一个细微结冰忍耐趋势。我们的研究显示出那M。alternatus在自然选择下面进入了复杂冷变硬的策略。结冰回避是主要策略；与到上面的SCP或<的延长暴露持续时间0pC，寒冷忍耐是更重要的；这被跟随由在严厉冬季期间冻结忍耐。

简介：Theprincipleofstripwidthmeasuringsystemwithopticalfiberlinkisdescribed,andapracticalmethodisintroduced.

简介：Coldringrollingisanadvancedbutcomplexmetalformingprocessundercoupledeffectswithmulti-factors,suchasgeometrysizesofrollsandringblank,material,formingprocessparametersandfriction,etc.Amongthesefactors,frictionbetweenrollsandringblankplaysanimportantroleinkeepingthestableformingofcoldringrolling.Ananalyticalmethodwasfirstlypresentedforproximatelydeterminingthecriticalfrictioncoefficientofstableformingandthenamethodwasproposedtodeterminethecriticalfrictioncoefficientbycombininganalyticalmethodwithnumericalsimulation.Andtheinfluenceoffrictioncoefficientonthequalityofend-planeandsidespreadofring,rollingforce,rollingmomentandmetalflowcharacteristicinthecoldringrollingprocesshavebeenexploredusingthethreedimensional(3D)numericalsimulationbasedontheelastic-plasticdynamicfiniteelementmethod(FEM)undertheABAQUSsoftwareenvironment,andtheresultsshowthatincreasingthefrictiononthecontactsurfacesbetweenrollsandringblankisusefulnotonlyforimprovingthestabilityofcoldringrollingbutalsoforimprovingthegeometryanddimensionprecisionofdeformedring.

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简介：AdeuteronpossessesacoulombpotentialbarrierwithmaximumUmax≈10^6eV(atro=1.51×10^-13cm)aroundhim.Soprerequisitetodirectcollideandexcitenuclearfusionreactionfortwodeuteronsistopenetratetoallofoppositebarrier.

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简介：AuthorshavestudiedthetransformationprocessesofcoldairoverlandinEastAsiaforeightcaseswhichoccurredindifferentmonthsof1981.First,thesurfaceeddysensibleandlatentheatfluxes,anddragcoefficientwereestimatedaccordingtotheapproachofsimilaritytheory.Then,theapparentheatsource,theapparentmoisturesink,andsolarandlong-waveradiativeheating(orcooling)werefurthercalculatedthroughthebudgetmethodandphysicalparameterizationalgorithm.Ithasbeenfoundthatthecoldairimmediatelystartsthetransformationprocessoverlandonceitmovesawayfromitsregionoforigin.Inwinter,thedegreeoftransformationofcoldairmassgraduallyintensi-fiedasittravelledsoutheastward;whilearrivingintheocean,thecoldairmassunderwentthemostsignificanttransfor-mationprocess.Insummer,themostvigoroustransformationofthermalandmoisturefieldswasobservedinNorthChinaandMongolianregion,withmuchgreaterintensitythanthatinwinter.

简介：Widthspreadisusuallyconsideredinhotrolling,nevertheless,itcanbeignoreincoldrolling.Inordertocontrolthecrownandflatnessbettersimultaneouslyandrealizethedecouplingofcrownandflatness,thetransversedisplacementfunctionofstripisdefinedanddeduced.Thefactorsthataffectsthewidthspreadareanalyzingwiththefunction.Accordingtotheunchangedprincipleofvolumebeforeandafterrolling,theflatnessmodelwhichconsidersthewidthspreadisdeduced.Throughthemodel,thetransversemetalflowingofdifferentstandsanddifferentthicknessisanalyzing,itisfoundthatthewidthspreadisbiggestincoldrollingattheNo.1standbecauseofthemaximumthicknessandreductionandtheminimumdeformationresistance.Itgivesagoodfoundationforthedecouplingofcrownandflatness.

简介：Throughout30yearsofimportation,adoptionandinnovation,theColdRollingPlantofBaosteelhasadheredtoamarket-orientedstrategy,andgraduallyexpandeditsoutputandraiseditstechnicallevelthroughtheexpansionofproductionscale,theoptimizationofproductionlines,thedevelopmentofhighaddedvalueproducts,theimprovementofproductquality,environmentallyfriendlymanufacturingandtechnologicalinnovation.Inthisway,theplanthasdevelopedintoaworldclasscoldrollingplantthatproducescutting-edgeeconomicandtechnicalindices.

简介：WeinvestigatethepropagationcharacteristicsofthenarrowbandStokes/anti-Stokesphotonsincoldatomicvapor.Thefour-wavemixingprocessresultsfromparametricamplificationoftheanti-Stokesphotons.Wefindthattheprocessofparametricamplificationisverysimilartothelightpulsepropagatingthroughananomalousdispersiongainmedium.Finally,weobtainthegeneralsolutionsoftheGlauberbiphotoncorrelationfunctions,whichareingoodagreementwiththeexperimentresults.

简介：AstheColdWarhaspassedintohistory,China’snationalsecurityisnowfacedwithanewinternationalenvironment,inwhichthebipolarconfrontationhasdisappearedandthedangerofanewworldwarhasfurtherreceded.China’scurrentsecuritycanbesaidinabetterconditionthanatanytimeduringtheColdWar.