简介：Inthispaper,thefollowingproblemsarediscussed:themountingconditionsofthreeprobes,thetransmissioncharacteristicsofmeasuringsystem,theeliminationofmountingeccentricity,andsoforth.Themeasuresforsolvingtheseproblemsarealsopres-ented.Atlast,theauthorgivessomeideasaboutthesolubilityandthecorrelationsoftheoutputequations.

简介：Slipanddeformationofconcretesandwichpanelsunderuniformlydistributedloadsisconcerned.Theeffectofsliponthedeformationofconcretesandwichpanelsarestudied,andtheanalyticalexpressionsofslipanddeformationforconcretesandwichpanelsisobtained.Theseformulaecandescribetheslipdistributionandaccountforitseffectondeformation.Inordertorestricttheboundofformula,theformulaofcrackmomentisobtained.Theresultsoftheoreticalcalculationarecomparedwiththoseoftestsandfiniteelementmethods.Thecomparisonshowsthattheresultsoftheoreticalcalculationareinaccordwiththoseoftestsandfiniteelementmethods.Sothetheoreticalcalculationcanbeusedtocalculateslipanddeformationofconcretesandwichpanelsinpracticalprojects.

简介：Chlorofluorocarbons(CFCs)orhydrochlorofluorocarbons(HCFCs)areasmainrefrigerantsusedintraditionalrefrigerationsystemsdrivenbyelectricityfromburningfossilfuels,whichisregardedasoneofthemajorreasonsforozonedepletion(man-maderefrigerantsemission)andglobalwarming(CO2emission).Sopeoplepaymoreandmoreattentiontonaturalrefrigerantsandenergysavingtechnologies.AninnovativesystemcombiningCO2transcriticalcyclewithejectorcycleisproposedinthispaper.TheCO2compressionsub-cycleispoweredbyelectricitywiththecharacteristicsofrelativelyhightemperatureinthegascooler(definedasanintercoolerbytheproposedsystem).Inordertorecoverthewasteheat,anejectorsub-cycleoperatingwiththenaturalrefrigerants(NH3,H2O)isemployed.Thetwosub-cyclesareconnectedbyanintercooler.Thiscombinedcyclejoinstheadvantagesofthetwocyclestogetherandeliminatesthedisadvantages.TheinfluencesoftheevaporationtemperatureinCO2compressionsub-cycle,theevaporationtemperatureintheejectorsub-cycle,thetemperatureintheintercoolerandthecondensationtemperatureintheproposedsystemperformancearediscussedtheoreticallyinthisstudy.Inaddition,someuniquefeaturesofthesystemarepresented.

简介：AhomogeneoustheoreticalmodelisdevelopedtopredicttheperformanceofR22andR290inadiabaticcapillarytubes.Themodelisbasedonconservationequationsofmass,momentumandenergy.Metastablebothliquidandtwo-phaseflowregionsareconsideredinthemodel.Inmetastabletwo-phaseregion,superheatedliquidisintroducedintothemetastablemixtureviscosityandtwomethodsarepresentedtoevaluateit.Themodelisvalidatedbycomparingthepredictedpressureandtemperatureprofileandmassflowratewithseveralinvestigators′experimentaldataofR22andoneofitsalternativesR290reportedinliterature.Allofthepredictedmassflowratesarewithin±8%ofmeasuredvalues.Comparisonsarealsomadebetweenthepresentmodelandotherinvestigators′modelsorsizingcorrelation.Themodelcanbeusedfordesignorsimulationcalculationofadiabaticcapillarytubes.