简介:Withtherapiddevelopmentofglobalinformationhighway,multimediacommunicationtechnologyplaysamoreandmoreimportantroleinnationaleconomicandsocialdevelopment.However,themultimediacommunicationsystemisacomplicatedrealtimedistributedsystemanditssoftwareisdifficulttodevelop.Inordertoimprovetherapiddevelopmentandapplicationofthemultimediacommunicationtechnology,thereisanurgentneedtocarryoutthebasicresearchworkofsoftwaredevelopmentplatforminthisfield.
简介:Title:DiscontinuousDeformationAnalysisandRecentCrustalMovementAuthor:WANGZeminSupervisor:LIUJingnanThestudyfocusesonthewait_to_be_resolvedimportantdifficultproblem—howtoanalyzeandprocessthenumerousdataofcrustalmovementgainedbyrecentmeasuringmethodsoastodiscovertheinnermechanisms,thispaper,adopt
简介:NaturalweakacidicgroundwateroccursintheunconfinedandconfinedaquifersconsistingofQuaternaryandNeogeneunconsolidatedsedimentsnearBeihaiinsouthernGuangxi,China.UndernaturalconditionsthegroundwaterhaslowTDS(lessthan200mgL-1)andlowconcentrationsoftraceelements(lessthan100μgL-1)withadeceasingtendincontentsoftheLanthanides(rareearthelements,lessthan1μgL-1)towardshigheratomicnumber.ThegroundwaterrangesinpHfrom3.33to7.0withanaveragevalueof5.12(evenlowerthanthatoflocalrainwater,5.88).pHvaluesinthegroundwaterareabithigherinrainyseasonsthanthoseindryseasonsanddonotshowsignificantincreasingordecreasingtrendwithtime.TheaveragepHvalueingroundwaterintheconfinedaquifersisevenabitlowerthanthatintheunconfinedaquifer.ComprehensiveanalysesofthegroundwaterenvironmentsuggestthatH+inthegroundwatermaybederivedfromdissociationofH2CO3,releaseoftheabsorbedH3O+inclaylayersandtheacidityofrainwater.TheH2CO3inthegroundwatermaybeformedbydissolutionofCO2(g).Mineralsintheunconsolidatedsedimentarepredominatedbyquartzwithsmallamountofclayminerals.Thesedimentsundergoingalong-termweatheringcontainlowlevelsofsolubleconstitutes.Lackofalkalinesubstancesinthegroundwatersystemisalsohelpfulintheaccumulationofacidityofthegroundwater.
简介:摘要: 锅炉炉水 pH 值能否达到所需标准在一定程度上影响着蒸汽品质的好坏,若是锅炉炉水的水质没有达到国家或行业的相关标准,一方面容易导致锅炉在使用过程中形成更多的水垢,导致其热效率明显降低,严重影响工作效率和质量,与此同时,就需要及时对锅炉进行化学清洗,而加大清洗频率则会导致锅炉其他部件出现损坏现象,对锅炉质量和安全极为不利。另一方面由于锅炉水具有较高的含盐量,在一定程度下与汽水会产生共沸,严重影响锅炉炉水的水质,严重时则会引发安全事故。而通过实际结果和相关研究分析导致锅炉炉水 pH 值偏低的影响因素比较多,基于此,本文主要研究的是对引起其 pH 值偏低的原因进行分析,同时研究有效的处理解决措施,以此保证锅炉炉水的水质,提高锅炉的安全性。
简介:PHSJ-4型PH计是我局第一台高精确度的PH计,应用到实际观测过程中,遇到许多影响观测质量的具体问题。本文针对PHSJ-4型PH计使用过程中遇到的乱码、测值突跳、电极老化快、合理分辨率的确定、温度干扰因素的控制等问题展开分析,做了大量的条件实验,结合该仪器的工作原理以及PH值所遵循的化学原理,指出要提高和保障观测质量,观测时必须做到如下几点:调节观测参数时用指腹轻按,出现局部黑屏、乱码现象可采用关机后重新开机解决;电极一定要浸泡在KCL保护液中,观测完毕清洗电极后一定要用滤纸把残余的蒸馏水擦干后再授泡在KCL保护液中以免降低电极保护液的保护功效,延长电极的寿命;水样要达到室温时才能进行观测;合理分辨率应设置在0.01PH档。
简介:摘要:水轮发电机组的推力轴承承担着机组转动部分的全部重量和水的轴向推力,在检修过程中需要对推力轴承弹性油箱的受力进行调整,一方面使各个弹性油箱受力均匀,另一方面又要保证镜板水平符合要求。传统调整方法的调整精度及效率都极低,受力调整与水平调整难以兼顾甚至可能出现两者调整方向相互矛盾的情况。本文所述调整方法的创新性在于:建立了测量值与每个弹性油箱应该调整量之间的精确数学关系,理论上可一次调整成功,且达到最高调整精度。填补了推力轴承受力调整方法缺乏理论指导的空白,对于全面提高水轮发电机组的安装与检修质量具有重要意义。关键词:弹性油箱 压缩值 平衡力系 受力调整 自由高度
简介:Inordertobetterunderstandthecompositionalandstructuralcomplexityofdissolvedorganicmatter(DOM)macromoleculesandprovidemechanisticinformationonthebindingofhydrophobicorganiccontaminants(HOCs)toDOM,wefractionatedlargeamountsoflakewaterintothreehydrophobicDOM-fractions.Thevariationofthepartitioningcoef?cients(KDOC)ofpyreneatdifferentpHlevelswasexaminedby?orescencequenchingtitration.Resultsshowthat,relativetothemorepolaracidicDOM-fractions,thehydrophobicneutralfractionexhibitsahighersorptionabilitytopyrene.Generally,thesorptionofpyrenetothethreehydrophobicfractionsisstronglypH-dependent.TheKDOCvaluesofpyrenegenerallyincreasewithdecreasingpHlevels,whichisespeciallyobviousinthesorptionofpyrenetothefulvicacidfractions,suggestingthatthebindingiscontrolledbyhydrophobicinteractions.Themechanismsunderlyingthebindingofpyrenetothehydrophobicfractionswerealsodiscussed.Ourdataarebene?cialtofurtherunderstandingthebindingofHOCstoDOMandhowithasbeenaffected,whichmayresultinmoreaccuratepredictionsofKDOC.
简介:一个全球海洋碳周期模型基于海洋将军发行量模型流行音乐和改进biogeochemical模型,OCMIP-2被采用在历史上观察的大气的CO2集中和不同未来情形(叫的代表性的集中小径,或RCP)下面模仿碳周期过程。在这份报纸的RCP为第五份评价报告(AR5)在气候变化(IPCC)上跟随Intergovernmental面板的设计。模型结果证明海洋从空气吸收CO2,被吸收将在四RCP下面在第21世纪继续。由空至海的CO2流动在历史的时间期间增加了并且到达的网1.87Pg/a(由碳计算了)在2005;然而,它将在第21世纪到达山峰然后减少。海洋主要专心于CO2中间的纬度,并且在赤道区域释放CO2。然而,在南极围绕天极的水流(ACC)区域,海洋将在升起的CO2集中下面从来源改变到水池,包括RCP4.5,RCP6.0,和RCP8.5。在2100,人为的碳将被搬运到40摥漠敶?桴?湥楴敲礠慥?獩爠畯桧祬?呼??湡?桴?潲敬漠???獩琠敨猠慭汬獥t