简介：In1955inAmerica,BillHaleyandHisCometsperformedRockAroundtheClockwhichwasthefirstbighitofthisnewstyleofmusic.Atthebeginning,itwasfirstknowas"rockandroll"andthensimplyas"rock".Itwouldbecomethemostpopulartypeofmusicfromthatpointon.

简介：你经常从电视上或MP3里听到摇滚乐PET人们为了消除紧张感，去欣赏摇滚乐，从中享受快乐。你了解它的起源、组成与发展吗？

简介：在中国，喜爱流行音乐的人占多数；可是在美国，喜欢摇滚的人最多，其次是说唱音乐和乡村音乐。邦妮·瑞特是美国的著名摇滚歌手，谁又是中国当红的摇滚巨星呢？

简介：Geothermalenergyisapreciousresource,whichiswidelydistributed,varied,andabundant.Chinahasenteredaperiodofrapiddevelopmentofgeothermalenergysince2010.Asshallowgeothermalenergypromoting,thedepthofhydrothermalgeothermalexplorationisincreasing.ThequalityofHotDryRock(HDR)andrelatedexploratorytechnologiesarebetterdevelopedandutilized.Onthebasisofgeothermaldevelopment,thispaperreviewsthegeothermalprogressduringthe"12thFive-YearPlan",andsummarizestheachievementsofhydrothermalgeothermalandhotdryrocksfromgeothermalsurveyandevaluationaspects.Finally,theauthorspredictthedevelopmenttrendofthefuturegeothermalresearchtobenefitgeothermalandhotdryrockresearch.

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简介：Areasonablestrengthcriterionshouldreflectthehydrostaticpressureeffect,minimumprincipalstresseffect,andintermediateprincipalstresseffect.Theformertwoeffectscanbedescribedbythemeridiancurves,andthelastonemainlydependsontheLodeangledependencefunction.Amongthreeconventionalstrengthcriteria,i.e.Mohr–Coulomb(MC),Hoek–Brown(HB),andExponent(EP)criteria,thedifferencebetweengeneralizedcompressionandextensionstrengthofEPcriterionexperienceafirstlyincreasethendecreaseprocess,andtendstobezerowhenhydrostaticpressureisbigenough.Thisisinaccordancewithintrinsicrockstrengthcharacterization.Moreover,thecriticalhydrostaticpressureIccorrespondingtothemaximumdifferenceofbetweengeneralizedcompressionandextensionstrengthcanbeeasilyadjustedbyminimumprincipalstressinfluenceparameterK.So,theexponentfunctionisamorereasonablemeridiancurves,whichwellreflectsthehydrostaticpressureeffectandisemployedtodescribethegeneralizedcompressionandextensionstrength.Meanwhile,threeLodeangledependencefunctionsofLMN,LWW,andLYMH,whichunconditionallysatisfytheconvexityanddifferentialrequirements,areemployedtorepresenttheintermediateprincipalstresseffect.Realizingtheactualstrengthsurfaceshouldbelocatedbetweenthegeneralizedcompressionandextensionsurface,newtrue-triaxialcriteriaareproposedbycombiningthetwostatesofEPcriterionbyLodeangledependencefunctionwithasamelodeangle.Theproposednewtrue-triaxialcriteriahavethesamestrengthparametersasEPcriterion.Finally,14groupsoftriaxialtestdataareemployedtovalidatetheproposedcriteria.Theresultsshowthatthethreenewtrue-triaxialexponentcriteria,especiallytheExponentWillam-Warnkecriterion(EPWW)criterion,givemuchlowermisfits,whichillustratesthattheEPcriterionandLWWhavemorereasonablemeridiananddeviatoricfunctionform,respectively.Theproposednewtrue-tria

简介：本文以一节高中英语话题拓展阅读课为例,说明如何围绕主题语境,通过学习理解、应用实践、迁移创新等层层递进的语言、思维、文化相融合的活动,达到培养学生核心素养的目的。

简介：Post-collisionalvolcanicrocksofMesozoicageoccurintheregionsadjacenttoGerze,partofthesouthernQiangtangTerraneofnorthernTibet,China.Geochronological,geochemical,andwholerockSr-Ndisotopicanalyseswereperformedonthevolcanicrockstobettercharacterizetheiremplacementageandmodelsfortheirorigin.Laserablation-inductivelycoupledplasma-massspectrometry(LA-ICP-MS)U-Pbzirconanalysesyieldedconsistentagesrangingfrom123.1±0.94Mato124.5±0.89Maforsixvolcanicrocksfromthestudyarea.Theintermediatevolcanicrocksbelongtothealkalineandsub-alkalinemagmaseriesintermsofK2O+Na2Ocontents(5.9%–9.0%),andtotheshoshoniticandcalc-alkalineseriesonthebasisoftheirhighK2Ocontents(1.4%–3.3%).TheGerzevolcanicrocksarecharacterizedbytheenrichmentoflightrareearthelements[(La/Yb)N=34.9–49.5]andlarge–ionlithophileelements(e.g.,Rb,Ba,Th,U,K,Pb,andSr),slightlynegativeEuanomalies(Eu/Eu*=0.19–0.24),andnegativeanomaliesinhighfieldstrengthelements(e.g.,Nb,Ta,HfandTi),relativetoprimitivemantle.Thesamplesshowslightlyelevated(87Sr/86Sr)ivaluesthatrangefrom0.7049to0.7057,andlowεNd(t)valuesfrom-0.89to-2.89.Theseresultssuggestthatthevolcanicrocksstudiedderivedfromacompositionallyheterogeneousmantlesourceandthattheirparentmagmaswerebasaltic.Themoremafic,parentalmagmastotheGerzevolcanicrockslikelyunderwentfractionalcrystallizationofclinopyroxene,hornblende,biotite,andpotassiumfeldspar,duringascent,withlittletonocrustalcontamination,priortotheireruption/emplacement.Whilethesevolcanicrocksexhibitgeochemicalsignaturestypicalofmagmasformedinadestructiveplate-marginsetting,itisplausiblethattheirmantlesourcemightalsohaveacquiredsuchcharacteristicsinanearlierepisodeofsubduction.