简介:AtrainingclassonhumanrightsknowledgeforstatefunctionarieswasheldinBeijingfromDecember11-14,2007.Morethan40officialsrespon-sibleforthepublicityworkonhumanrightsfromthecentralandstateorgansandthecentralpressorganizationsattended.OrganizedbytheStateCouncilInfor-mationOffice,thiswasthefourthofitskindheldsofar.
简介:Thispaperbrieflyaccountsacoursecalled"AGuidetoEnglishLearningStrategies",conductedbytheauthorsfortheEnglishmajorfreshmenattheiruniversity.Itsmaingoalwastoraisethelearners’"awarenessofstrategyuse"andhelpthelearnersmakebetteruseofsomelearningstrategies.IttackledsomecommonproblemswhichoftenmakeChineselearnersofEnglishlessefficientintheirlearning.Sug-gestionsareputforwardinthecourseevaluation,concerningmakingitmorepracticalandbeneficialforthelearners.
简介:ExaminingChina'spopulationchangesinthepastthreedecadesdemonstratesthatChina'sdemographictransitionhasbeensuccessfullycompletedwithasplendidandzigzagpath.Thereareprofoundhistoricalexperiencesandlessons.ThispaperreviewsChina'sfertilitytransitionwhichisdividedintofourperiodsandarguesthatfertilitychangesarearesultoftheinteractionsbetweensocioeconomicdevelopment,fertilitybehaviorsandfertilitypolicies.Substantialresistancetothe'one-childpolicy'during1979to1984resultedinreboundingandfluctuatingfertility.Thebabyboomoccurredintheperiod1985to1991wasamanifestationoftheinherentlawsofdemographicdynamics,andsubsequentlyforcefulbirthcontrolwasagainmobilized.Theperiodfrom1992to1999witnessedlargedeclinesinfertilitywhichpenetratesthereplacementzone,showingthatChinawascompletingthefertilitytransition.China'sstabilizinglowfertilityandemergingpopulationstructuralissuessince2000callforcomprehensivewaysinaddressingthepopulationproblems.
简介:Thenecessityofthetextbookcannotbeneglectedalthoughproblemsdoexistwithourteachingmateri-als.Asteachersitisimportantforustoevaluate,se-lectandadaptteachingmaterialstomeetourteachingandstudents’learningneedsinordertomaximizelearningpotentials.ThecasestudyofoneparticularEFLtextbookprovidesuswithmoreinsightsintotheunderstandingofourteachingmaterials.Theprocessofevaluatingtheteachingmaterialshelpsusmakede-cisionsinselectingtextbooks,aswellasallowingustoreflectonourteachingandlearningexperience.
简介:Thecourse-keepingcontrolofunderactuatedhovercraftwithtwoaftpropellerswasconsidered.Thecontroloftheheadingerrorandcross-trackerrorwasaccomplishedbytheyawtorquemerelyinthiscase.Thehovercraftdynamicmodelisnonlinearandunderactuated.AtfirsttheControllabilityofcourse-keepingcontrolforhovercraftwasproved,thenacourse-keepingcontrollawwasderivedthatkeepshovercraftheadingconstantaswellasminimizesthelateralmovementofhovercraft.Theproposedlawguaranteesheadingerrorandswayerrorallconvergetozeroexponentially.Simulationtestswerecarriedouttoillustratetheeffectivenessoftheproposedcontrollaw.Forfurtherresearch,thedisturbanceinfluencewouldbeconsideredinthedynamicequations.
简介:Dreippingelectrolytesintosilicasol,gellingreactionwilloccur,Theresearchindicates:thisisacomplicatedphysicemistrycourse,whichconsistsofapre-reactionandapolymerizaion,Theformercontrolsthewholecourse,andinwhichelectroniclayersofthesol'sparticlesbe-comemoreandmorethiner,butwithincresingofthesolconcentration,itscontrolforcewillbediminished,tillthefast-coagulation,thegellingcousebecomeso-controlled,Thelatterisanin-finitepolymericchani-reaction.Theresultofgelatinationistoproduceaverybigplymericmolecule-gel,whichinvolvesinallspace,includesallwater,anditsmolecularweightisin-definitebig.Theresearhalsoindicates:thedy-namiccourseofthegellingcouldbedescribedquantitaivelybyanexperienceformula:lgt=-nlgc+B,Allofthecharacteristicvalueshavedefinitephysicalmeaning,Electronicvalueofthecontrary-inosisthebiggestinfluentialfactor,thenaturesofthecontrary-ionsandthenaturesofthesame-electronic-inoshaveafewinfluentialforcesonthecharacteristicvalues,Thetemperatureincreasingmakesthegellingreactionfast.