简介:TheupwellingareaintheChangjiangEstuarywasselectedtocollectthecore,wheretheredtideoccurredfrequentlyandhypoxicexisted.Thetotalorganiccarbon(TOC),totalnitrogen(TN),biogenicsilica(BSi)andstableorganiccarbonisotopicratios(δ13Corg)weredeterminedonthe210Pb-datedsedimentcore.TheconcentrationsofTOC,TN,BSiaswellastheirsedimentationfluxeshaveincreasedtosomeextentsincethe1970s.TOCandTNfluxesincreasedabout45%,36%respectively.Theaverageδ13Corgvalueinthecorewas-23.67×10-3whichremainednearlyconstantbeforethe20century.Theδ13Corgvaluesincreasedafterthe1900s,twomarkedincreaseswereobservedfromthe1950sandthe1970s.Asimpleδ13Corgmodelwasusedtoestimatethecontributionofterrigenousandmarineorganicmatterinputsforthesediment,whichindicatedtheincreaseinaccumulationsincethe1970shasbeenalmostexclusivelymarine.Theincreasingofmarineorganicmatteraccumulation(TOC,TNandBSi)wascorrespondingwiththeincreasingoffertilizerconsumptionandtheNO3-NbudgetsfromtheChangjiangRiver.Theriverinerunoffoffertilizersandnutrientsstimulatedthealgaeblooming.Enhancedprimaryproductionresultedinanenrichmentoforganicmatterinthesediment.ThesedatasupportthehypothesisthatanthropogenicnutrientloadinghasbeenasignificantfactorontheeutrophicationintheChangjiangEstuary.
简介:Thestudydealswiththeobservationofthechangesintheelectricalactivitiesof8healthydiversinthe80mswsaturation-100mswexcursionhelioxdivebyDCG.Resultsshowedsignificantchangesinthe24hofaverageheartrate,thedecreaseofheartrateatsaturationstoragedepthanddecompressionperiodsbeing15.5%and19.7%respectively.Fortuitoussupraventricularprematurebeatsappearedin8diversandventricularprematurebeatsin5diversduringexposure.TransientischemicST-Tchangesin6diversoccurredrepeatedlyduringdivingoperations.ThediscussionputsuptheviewthattheST-Tchangeswereduetothestressreactionofthebodyinducedbythecombinedeffectofsuchstressfactorsashyperbaricpressureperse,highpartialpressureofoxgen,noiseandtheclosedrestrictedchamberenvironment.
简介:摘 要 武汉东湖国家自主创新示范区“光谷量子号”有轨电车采用100%低地板现代有轨电车,车辆配置了多项人性化设置,具有安全性好、人机工程性好、乘坐舒适性高等特点。
简介:摘 要:有轨电车作为轨道交通领域重要的组成部分,在目前鼓励中低运量轨道交通系统发展的政策支撑下,具有广阔的市场前景。车门系统是低地板有轨电车的重要组成系统且日常开关门非常频繁,其维修维护的好坏直接关系到车辆的安全行驶。本文基于武汉东湖国家自主创新示范区“光谷量子号”100%低地板现代有轨电车车门系统的运用和维修维护经验编写,有助于其他项目工程技术人员学习参考,提升车门系统维修维护工作质量和效率。
简介:摘要:某煤矿煤炭储量可采及局部可采煤层5层、12煤层:位于太原组中部,厚度0m--1.03m,属较稳定的局部可采煤层,顶板为砂质泥岩、泥质灰岩和细砂岩。通过MG100/240-BW型双滚筒式采煤机在煤矿12煤薄煤层工作面实际应用情况及采煤机性能,出煤效果良好。