简介:从2017年开始,铅锌矿山企业为了规范矿产资源开发秩序的有关规定,进一步提高矿区资源的利用率,实现矿山生产规模化、集约化、扩大矿山生产能力,保障矿资源开发可持续稳步发展,实施矿资源整合方案。小矿开始整合成大矿。随着矿山企业这几年的规范发展,矿山企业日益完善,直接影响矿山企业的会计成本核算。除了市场价格因素,铅锌矿山如何降低成本,提高收入,增加企业的利润。矿山成本管理成了矿山财务管理最重要的核心,也是铅锌矿山的难点,这需要对矿山矿石储量的勘探、采掘、选矿等各环节进行细分,对每个环节进行成本的改革。文章对铅锌矿山企业在采选矿各环节成本管理遇到的一些问题,进行浅析并提出解决方法。
简介:1.TheproblemTheterm'concussion'referstoacommonformoftraumaticbraininjury,whichtypicallyoccursafterabloworinjurytothehead.Ithasbeendescribedasa'complexpathophysiologicalprocessaffectingthebrain,inducedbybiomechanicalfactors',andshearforcesinducedbyrotationalaccelerationarebelievedtobetheprimarymechanismofinjuryinconcussion.~1TheincidenceofconcussionintheUKhasbeenshowntobeup
简介:AIM:Topredictthevisualoutcomeinpatientsundergoingmacularholesurgerybytwonovelthree-dimensionalmorphologicalparametersonopticalcoherencetomography(OCT):arearatiofactor(ARF)andvolumeratiofactor(VRF).METHODS:Aclinicalcaseserieswasconducted,including54eyesof54patientswithanidiopathicmacularhole(IMH).EachpatienthadanOCTexaminationbeforeandaftersurgery.Morphologicalparametersofthemacularhole,suchasminimumdiameter,basediameter,andheightweremeasured.Then,themacularholeindex(MHI),tractionalholeindex(THI),andholeformfactor(HFF)werecalculated.Meanwhile,novelpostoperativemacularhole(MH)factors,ARFandVRFwerecalculatedbythree-dimensionalmorphology.Bivariatecorrelationswereperformedtoacquireasymptoticsignificancevaluesbetweenthesteadybestcorrectedvisualacuity(BCVA)aftersurgeryand2D/3DargumentsofMHbythePearsonmethodwithtwo-tailedtest.Allsignificantfactorswereanalyzedbythereceiveroperatingcharacteristic(ROC)curveanalysisofSPSSsoftwarewhichwereresponsibleforvisionrecovery.ROCcurvesanalyseswereperformedtofurtherdiscussthedifferentparametersonthepredictionofvisualoutcome.RESULTS:Themeanandstandarddeviationvaluesofpatients'age,symptomsduration,andfollow-uptimewere64.8±8.9y(range:28-81),18.6±11.5d(range:2-60),and11.4±0.4mo(range:6-24),respectively.Steady-postBCVAanalyzedwithbivariatecorrelationswasfoundtobesignificantlycorrelatedwithbasediameter(r=0.521,P<0.001),minimumdiameter(r=0.514,P<0.001),MHI(r=-0.531,P<0.001),THI(r=-0.386,P=0.004),HFF(r=-0.508,P<0.001),andARF(r=-0.532,P<0.001).Othercharacteristicparameterssuchasage,durationofsurgery,height,diameterholeindex,andVRFwerenotstatisticallysignificantwithsteady-post-BCVA.Accordingtoareaunderthecurve(AUC)values,valuesofARF,MHI,HFF,minimumdiameter,THI,andbasediameterare0.806,0.772,0.750,0.705,0.690,and0.686,respectively.However,Steady-post-BCVAanalysiswithbivar
简介:Forearthquakedisastermitigation,weusehistoricalrecordsandmorecompleteintensityinvestigationdatafrom1500to2015toanalyzeandestimatetheseismicintensityandfrequencyoftheearthquake-proneareasinYunnan.WedigitizedintensityobservationsanddividedtheYunnanregionintocellsizeof0.2°x0.2°tocalculatetheseismicintensity-frequencyrelationshipforeachcell.CombinedwitharepeatedcycleofintensityofonehundredyearsandpopulationeconomicsdatainYunnan,weanalyzefutureareasofconcern.Theresultscanprovideareferenceforearthquakehazardousareazoning.Thismethodisbasedonhistoricalearthquakedata,reducingasmuchaspossiblethevarioushypothesesfortheassessment,andthuscanconciselyreflectthedifferentintensityfrequencydistributionsoftheregion.
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简介:预先滑动的政体典型地在机械系统的动态建模被忽视。然而,处于静态的磨擦引起的接触状态的变化可以减少位置的精确性和控制精确。为了调查在接触之间的关系,地位和接触在预先滑动强迫磨擦,一个光试验性的方法在这份报纸被介绍。与这个方法,在透明材料的接口的真实接触状态能被使用处理技术的一幅图象基于光的全部的思考原则观察。新奇安装,包括一双矩形的trapezoidal块,被建议解决精确地把不同正切、正常的力量用于接触接口的挑战性的问题。改进Otsus方法被用于测量。通过在polymethylmethacrylate(PMMA)上执行的试验性的研究,接触粗糙的数量被证明是影响真实接触区域的主导的因素。在在预先滑动的政体的真实接触区域和接触力量之间的关系被学习,并且在接触接口的静态的磨擦的分发是讨论的品质上。真实接触区域与增加静态的磨擦一起在膨胀的新现象被识别。上述的关系在在一个经常的正常压力下面的接触接口是近似线性的,并且磨擦应力的分发从前缘减少到后面的边。