学科分类
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2 个结果
  • 简介:Giventheexistenceoftransactioncosts,thelocationofpropertyrightsisanimportantfactorindeterminingtheincentivesforefficientlevelsofinvestmentatvariouslevelsoftheindustry.Thispaperappliessomeoftheeconomictheoriesofpropertyrightsandindustrialstructuretotheissuesconcerningtheconservationofbiodiversity.AlthoughtheexpansionofIntellectualPropertyRights(IPR)systemsintotheareaofgeneticresourceshasincreasedprivateinvestmentinR&Dprocessoftheagriculture,itdoesnotgenerateenoughincentivesforinsituconservationofbiodiversity.Tosolvethiseconomicinefficiency,farmers’rightsandotherdesignofincentivesandinstitutionalarrangementshouldbereconsidered.

  • 标签: 植物遗传资源 知识产权 经济学 激励机制 生物多样性 交易成本
  • 简介:Particlesbehaviourwasmonitoredandanalyzedinastormwaterwetlandoveraperiodof4months(June-September,2009).Theresultsindicatedthattheparticlesbehaviourcanbeaffectedbymanyprocesses,suchassedimentation,resuspension,adsorptionandreleaseinstormwaterwetlandsduringdrydays.Duetotheeffectsofthesefactors,theparticlesremovalefficiencycalculatedbasedonthesettlingtheorywassignificantlyhigherthanthevalueobtainedusingthemeasuredparticlesnumberconcentration.Andthemeasuredefficiencyshowedaturningpointintherangeof2-4μm,whichwaswithinthecolloidalparticlesrange.Analysisofparticlesizedistributionshowedthatparticleswerefinerintheoutflowthaninflowduetosedimentationofthecoarseparticlesandresuspensionofthefineparticlesinthewetland.Particlesindifferentsizerangesplaydifferentrolesintheircontributiontoturbidityandtotalsuspendedsolidsconcentration.Thefinerparticles(lessthan10μm)showedacloserrelationshipwiththeturbiditywhilecoarserparticles(>4μm)weremorerelatedtototalsuspendedsolidconcentration.

  • 标签: 胶体颗粒 去除效率 水湿地 行为 干燥 粒子数浓度