简介：Sincethemiddle1990s,ecotourismcertificationhasbeengivenmoreandmoreattentiontoaroundtheworld.Asadevelopingcountrywithabundantecotourismproducts,itisnecessaryforChinatoadoptcertificationtoensuresustainabledevelopmentofecotourism.ButtherearefewproductscertificateduntilnowinChina.Afterreviewingthetrendofecotourismcertificationintheworldandsummarizingitstheoryandmethod,thispaperanalyzestheprogressandprospectofecotourismcertificationinChina,andconcludesthatcertificationinChinaisnecessaryandpromising.

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简介：Sorptionofacetanilideherbicides,metolachlor,acetochlor,pretilachlorandbutachloroneightsoilswithvariousphysicalandchemicalpropertieswasstudied,TheadsporptionisothermscouldfitFreundlichequationwell(r^2≥0.91)andtheadsorptionextentsincreasedintheorder:metolachlor

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简介：Maca(Lepidiummeyenii)是在高高原成长的草本的植物并且因为它人的健康的好处，几个世纪被用作食物和民间药。在现在的学习，它的(内部抄录分隔符)43件maca样品定序，从不同区域或供应商镇定，被放大并且分析。它maca的十九潜在的掺杂物的序列也镇定、分析。结果显示maca的ITS顺序在所有样品是一致的并且唯一什么时候与它的掺杂物相比。因此，这条DNA-barcoding途径基于它的顺序能被用于maca和它的掺杂物的分子的鉴定。

简介：Thequasi-conformingelementofthecurvedbeamandshallowcurvedbeamisgiveninthispaper.Numericalexamplesillustratethatthequasi-conformingelementsofthecurvedbeamandshallowcurvedbeamWhichisusedtoaooroximatethecurvedbeamhavebetteraccuracythanthestraightbeamelement.Thecurvedbeamelementconstructedbydisplacementmethodcannotsatislyrigidbodymotionconditionandthevervfinegridshavetobeusedinordertosatisfyrigidbodymotionconditionapproximately.Inthispaperitisprovedthatthestraightbeamelementandthequasi-conformingelementofthecurvedbeamandshallowcurvedbeam.whenelementsizeisreducedinfinitely,haveconvergenceratewiththesameorderO(l~2)andwhenregulurelementsareused,Iistheelementlength.

简介：Inbandpasssigmadeltamodulator,resonatoristhekeyblock.Thispaperproposedanewresonatorwhichcansimplifythecircuitimplementationwhendesigningbandpassmodulatorwithlowpassprototype.Theeffectoffinitegain,finitebandwidth,andpathmismatchontheresonatorisanalyzed.ThefunctionoftheproposedresonatorandthedeviredequationsaboutpathmismatchhavebeenverifiedbyswitchedcapacitorsoftwareSWITCAP.

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简介：Thelinearcombinationofcertainpartitionofunity,subordinatetocertainopencoveringofacompactset,isprovedtobecapableofapproximatingtoacontinuousfunctionatarbitrarilyprecision.Byusingproperopencoveringandpartitionofunity,therobustnonlinearcontrollersandadaptivelawsaredesignedforaclassofnonlinearsystemswithuncertainties.Thestatesandparametersoftheclosed-loopsystemscanbestabilizedinthemeaningofUUB(uniformlyultimatelybounded)viatherobustnonlinearcontrollersandadaptivelaws.Finally,anexampleshowsthevalidityofmethodinthispaper.

简介：AbstractAcute pancreatitis (AP) is a common and potentially life-threatening pancreatic inflammatory disease. Although it is usually self-limiting, up to 20% of patients will develop into severe AP. It may lead to systemic inflammatory response syndrome and multiple organ dysfunction, affecting the lungs, kidneys, liver, heart, etc. Surviving patients usually have sequelae of varying degrees, such as chronic hyperglycemia after AP (CHAP), pancreatic exocrine insufficiency, and chronic pancreatitis. Lacking specific target treatments is the main reason for high mortality and morbidity, which means that more research on the pathogenesis of AP is needed. Ferroptosis is a newly discovered regulated cell death (RCD), originally described in cancer cells, involving the accumulation of iron and the depletion of plasma membrane polyunsaturated fatty acids, and a caspase-independent RCD. It is closely related to neurological diseases, myocardial infarction, ischemia/reperfusion injury, cancer, etc. Research in the past years has also found the effects of ferroptosis in AP, pancreatic cancer, and AP complications, such as acute lung injury and acute kidney injury. This article reviews the research progress of ferroptosis and its association with the pathophysiological mechanisms of AP, trying to provide new insight into the pathogenesis and treatment of AP, facilitating the development of better-targeted drugs.

简介：为L~的极大元的一条存在定理*在non-paracompactH空间上定义的-majorized通讯被建立。作为结果的应用程序，为non-paracompact的一条平衡存在定理在H空间概括了游戏与无穷地许多播放器并且与L~*-majorized通讯被给。

简介：Inthispaper,byusinganewprojection,weconstructavariantofZhang’salgorithmandproveitsconvergence.Specially,thevariantofZhang’salgorithmhasquadraticterminationandsuperlinearconvergenceraleundercertainconditions.Zhang’salgorithmhasn’ttheseproperties.

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简介：Ecologicalcity(eco-city)anditsplanningapproachareemergingconceptsinurbanstudy,urbanplanning,ecologicaleconomics,environmentalpolicyandcorporateenvironmentalmanagement.However,opinionsremaindividedovertheconnotationanddenotationoftheterm'ecologicalcity',whatkeyissuesecocityplanningcansolve,anditsspecificcontents.Inthisstudy,wepresent10basicpropositionsthatdefinetheeco-cityandclarifyitskeyparameters,therebyprovidingthebasisfordiscussingtheassumptionsandprinciplesunderlyingdifferentapproachestosustainableurbandevelopment.Wethensummarizetheconceptandprinciplesofaneco-city,anddefinethemainrequirementsforecocityplanning.Weconcludethataneco-cityisacityinwhichtheurbanpopulation,scaleoflanduseandintensityofhumanactivitiesarelimitedtotheregionalresourceandenvironmentalcarryingcapacity,whichdoesnotcauseincreasingorirreversibledamagetotheregionalecosystem'sstructure,functionsandprocesses.

简介：Coopetitionhasbecomethecurrentstrategictrendoftheeconomicdevelopment.Inthispaper,coopetitiongameandtheequi'ibriumhavebeendevelopedthroughcomparingthecharacteristicsofcooperationgamewiththoseofcompetitiongame.Furthmore,analgorithmusingonekindofminimaxtheoremproposedbyDingzhu-Duin1990isputforwardtosolvecoopetitiorgame.Thealgorithmhasgreatadvantagesoverothermethods,whichcansolveirregularandnon-differentialconcaveorconvexfunctionofthegames.Acoopetitiongameofcournotmodelwithasymmetricoligarchsisadvancedandthecoopetitionequilibriumshavebeenobtainedbysimulation.ThesimulationresultsarecomparedwiththatofNashequilibrium.Conclusionscanbemadethatmoremembersinacoalitioncouldgethighersatisfactiondegreesatcoopetitionequilibriums,whichisdependentoncostandpotentialmarketdemands.

简介：Whatistheinternationalorder?ProfessorZhaoXiaochundefineditasthe'standardsandspecificationsestablishedbythemembersoftheinternationalsysteminordertomaintainitsstabilityandnormaloperationaswellcoordinatingandaddressinginternationalaffairs,andactingasaguaranteemechanism,adecision-makingprocessandprovidingrulesofagenda'.ProfessorCaiTuodefinesitasthe'specificnorms,institution,

简介：ThepropertiesandmechanismofconcreteunderwaterleakagecorrosionwerestudiedintermsofthedissolutionofcalciumoxideandsiliconoxidefromconcreteandthevariationofpHvalueofpermeatewater.Theexperimentalresultsshowthattheamountofcalciumoxideandsiliconoxidedissolvedfrompercubicmeterofconcretegraduallydecreasewithpenetrationtimeandultimatelystabilizeatacertainvalue.ThepHvalueofpermeatewaterdescendalongwithpenetrationtime.Thedurabilityofconcreteunderleakagecorrosionwasanalyzedbyaformulafittedonthedissolvedamountofcalciumoxide.

简介：Inthispaperthedevelopmentofthetechnologyofthelaserscanningissummarized.Theprinciplesoflaserrangescanningareintroduced.Basedonthelaserscanningtechnologyandmethods,whichareinvestigatedbytheauthorstosurveydepositvolume,asurveyingsystemisdevelopedandapracticalapplicationisperformed.Itisshownthatthelaser-scanningtechnologyhasobviousadvantagessuchasmeasurementprecision,automationandvisualizationofobserveddataincomparisonwiththetraditionalmethods.Asaresult,laborintensityisrelievedobviouslyandworkefficiencyispromoted.