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简介：节水这件事，小时候就知道。当时还不明白为什么要节水，只知道节约用水的是好孩子。长大后看过一个纪录片，了解到在非洲很多人没有水喝，虽然也深深地被触动，但总有“缺水这件事离我还很遥远”的感觉。直到今年我国西南五省遭遇旱灾严重缺水，才真正开始意识到水资源的宝贵和节水的必要性。

简介：InthispaperconservationlawsofnonholonomicnonconservativedynamicalsystemsarestudiedbyusingthedifferentialvariationalprinciplesofJourdainandthegeneralizedNoether’sidenti-tiesofnonconservativesystemssubjecttofirstordernonlinearnonholonomicconstraintsareprovided.

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简介：ThepresentsituationofforesttreegeneticgermplasmresourcesresearchandconservationinChinaisintroducedwhichincludingthebackground,decision-makingofconservationstrategiesandprinciples,theplanofareadivisionandtreespeciesclassification,thesamplestrategyofgermplasmconservation,theadvancesinconservationpatternandrelatedtechnologiesresearch,theachievementsofgermplasmconservationandutilizationinChina,andtheproblemstobesolved.Therecentachievementsa...

简介：§1.IntroductionItisveryimportanttostudythetheoryofthemultidimensionalhyperbolicconservationlaws.Atypicalmodelisthefollowinginitialvalueproblem

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简介：Thispaperstudiestheinteractionofelementarywavesincludingdelta-shockwavesontwoboundariesforahyperbolicsystemofconservationlaws.Thesolutionsoftheinitial-boundaryvalueproblemforthesystemareconstructivelyobtained.Intheproble

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简介：Theexistingbuildingenergy-savingrenovationprojectwithquasi-publicgoodsattributeshasinherentlydefinedthecharacteristicsofmarketexternalityandinformationasymmetry,leadingtotheexistingbuildingenergy-savingrenovationmarketfailure.Improvetheexistingbuildingenergy-savingmarketdevelopmentguaranteesystemisthefoundationofpromotingmarketcultivation,andhealthydevelopment,whichneedtoimprovethelegalsystem,richincentivepolicies,clearqualitystandardsandimplementenergyefficiencylabeling.

简介：AccordingtostatisticsconductedbytheEnvironmentBureauofT.A.R，Tibethasestablished7differentconservationareasatnationallevel,8atprovinciallevel,and23atsub-provinciallevel.Thetotalconservationareareachesto407,000sqkm,ThisnumberaccountsforonethirdoftA.R,andranksnumberoneinChina.

简介：我们为能量守恒定律的多维的夸张系统构造并且实现一个非摆动的松驰计划。方法转变非线性的夸张系统到半有没有使用Riemann解答者或线性重复，能数字地被解决的一个松驰来源术语和线性特征的线性模型。到discretize我们在空间和TVDRunge-Kutta时间集成考虑高分辨率的重建的松驰系统。计划的详细明确的表达在三种空间尺寸为问题被给，数字实验在数量和系统盒子被实现显示出方法的有效性。数学题目分类：35L60，35L65，82B40，65M20，74S10，65L06。

简介：Byadoptingtheevaluationindexsystemofconservationprioritywhichincludedthreatenedcoefficient,geneticcoefficient,utilizationcoefficient,protectionstatuscoefficientandliststatuscoefficient,theendangeredplantsinNortheastChinawerequantitativelyanalyzedandsyntheticallyevaluated,andthevalueofconservationpriorityandconservationprioritygradesoftheendangeredplantsweredetermined.Theresultsshowedthattherewere60speciesofendangeredplantsbelongingto42generaand25familiesinNortheastChina,thevalueofconservationpriorityrangedfrom0.8538-0.3184.Theendangeredplantsweredividedinto3gradesaccordingtotheirvaluesofconservationpriority,17speciesbelongingto15generaand11familieswereinthefirstgradeprotection,18speciesbelongingto14generaand11familieswereinthesecondgradeprotection,25speciesbelongingto17generaand13familieswereinthethirdgradeprotection.Thequantitativelyevaluationindexsystemofconservationpriorityinthispaperrepresentedthedegreeofconservationpriorityoftheendangeredplantscomprehensively,objectivelyandaccurately.

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简介：Watersavinganddevelopingwaterconservationsocietyarethetwokeystrategiesbothforwisewaterallocationandsustainableutilization.Thepaperanalysestheconnotationofwatersavingandwaterconservationsociety.Essentially,watersavingmeansfreeingupwaterfromnon-beneficialusesandprovidingittosomemoreproductiveuses.Basicprinciplesforsettingindicatorarepresentedbyprovidingefficientuseofwater,consideringsocialissuesandecologicalprotection.Anintegratedassessingwatersavingsystemaimingatmoresustainableandefficientconsumptionisgivenconsideringunbalancedsocialandeconomicdevelopmentinregionsandbasins.Thehierarchyindicatorsystemprovidesqualifiedtoolstothepracticeofwaterconservationandevaluatesthevalueforwaterconservationsocietyconstruction.

简介：介绍改进熵生产的估计的证明的一个方法因为(TVD)一般全部的变化减少策划。TVD计划的一般理论的元素；为严格的凸的能量守恒定律获得第二个顺序resolution-TVD计划的一个班的熵不平等的基础；分离的熵不平等的定义。

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简介：Byintroducingthegeneralizedquasi-symmetryoftheinfinitesimaltransformationfortransformationgroupG,,thispaperstudiestheconservationlawsandsymmetriesofdynamicalsystemswithunilateralconstraintsinphasespace.Noether’stheoremandNoether’sinversetheoremforme-chanicalsystemswithunilateralconstraintsinphasespaceareobtainedandtwokindsofequivalentformsofgeneralizedKillingequationswhichareusedtodeterminethe8eneratorsoftheinfinitesimalgrouptransformationaregiven.

简介：尽管他们的保存的紧急被认出了，自从2002，全球性重要的农业遗产系统(GIAHS)由食物和农业组织(粮农组织)指明了，自从2012面临至于为什么保存他们的问题，中国全国地重要的农业遗产系统(China-NIAHS)由中国的农业(恐鸟)的部证明了，吗什么将被保存，谁，并且怎么应该保存他们？这篇论文试图澄清并且对这作出回应问题基于理论、实际的进步的评论在中国集中于农业遗产系统的保存。农业遗产系统为持续、公平的开发并且因此展出大量的值应该为现在和未来代被保存。不同于很常规的遗产，农业遗产系统的保存是物理、生物的部件和联系社会文化的过程应该以一个动态方法在被保存的一个复杂、系统的工程。农民和遗产地点必须在被支撑的生态的功能的前提下面得益于传统的农业生产的延续，传统的文化正在被继承。为更有效的保存，一个多股东过程应该被建立在不同层次，多学科的科学家，社区和农民包含政府，并且企业企业以及社会组织。作为被表明了，农业遗产系统的保存试图支持地区性的持续开发，以改进生计，食物安全和农场人的健康，并且在中国为现代农业的开发提供引用。

简介：Highperformancecontrolofaninteractiveprocesssuchasironandsteelplantreliesonabilitytohonorsafetyandoperationalconstraints;reducethestandarddeviationsofvariablesthatneedtobecontrolled(e.g.productquantity,quality);de-bottleneckingtheprocess;and,maximizeprofitabilityorlowercost(e.g.energysavings,improvehotmetalcontent).Theseobjectivesmaybeprioritizedinthisorder,butcanvaryandareverydifficulttoachieveoptimallythroughconventionalcontrol.Amultivariablepredictivecontrollersolution,alongwithitsextensiveinferentialsensorandbuilt-inoptimizer,providesonlineclosedloopcontrolandoptimizationformanyinteractivemetalandminingprocessestolowertheenergycost,increasethroughput,andoptimizeproductqualityandyield.Controlloopperformanceisalsoakeyfactortoimproveironandsteelplantautomationandoperationresult;HoneywellCPMoffersvender-independentproductwhichprovidesmonitoring,tuning,modelingofcontrolloopandsustainableloopperformanceanalysisandmaintenancesolutiontowardsoperationstabilityandenergysaving.