简介:Trafficruleisakeyfactoraffectingtrafficflowandsafety.Wedevelopourmodels,includingthecellularautomatatrafficflowmodelaswellasthelinearregressionone,aimingatcalculatingtrafficflowandevaluatingsafetyconditionswithvariedtrafficrules.Then,wethoroughlyinvestigatefourtypesofpathsinafreeway,namelytwostraightlanes,threestraightlanes,ramps,androundaboutsascasestudiesanddiscussthedifferenttrafficrulesascomparison.Theresultsdemonstratethat“Keep-Right-Except-To-Pass”ruleisnotaseffectiveasthefreeruleinpromotingtrafficflow;however,thisruleensuressafetyfordriversbetterthanthefreerule.Additionally,anewtrafficrule,whichsetsdifferentpostedspeedlimitsforadjacentlanes,isproposedtopromotebettertrafficflowwithsafetyrequirementssatisfied.Furthermore,weapplyeffectiverulesandalternatives,leftdrivingnormsaswellasintelligentsystemasextensionandobtainbetterresults.Finally,model’ssensitivityanalysisregardingtoprobabilityofdeceleratingandpostedspeedlimitsprovesthestabilityofourresults.
简介:监督分类法在遥感影像分类中应用广泛,结合已有地质资料和实测地质剖面信息,将研究区岩性分为苏维依组泥岩和粗砂岩,库姆格列木群泥岩、砾岩和含砾粗砂岩,巴什基奇克组粗砂岩和砾岩,巴西改组细砂岩等8个类型,运用ENVI提供的常用监督分类方法——最大似然法,对研究区的遥感影像进行岩性分类研究。并利用混淆矩阵分别对不同影像的分类结果进行精度评价,结果表明ZY-3影像的分类总体精度达到了78.65%,Kappa系数为0.7606,能够较好地进行岩性信息提取,具有较高的可靠性,可在地质调查工作中推广,能够有效地减少面积性地质测量工作,特别适用于岩石裸露程度较高的艰苦工作区。
简介:Thetransportofdangerousgoodsalwaysrepresentsapotentialrisktolife,humanhealth,property,andenvironmentalprotection.Forthisreasonandinordertopreservethelivesandhealthoftheparticipantsinthetransportprocess,adequateprotectionmeasuresmustbetakenbefore,during,andafterthetransportofdangerousgoods.Sincetherailwayitselfisarecipientofdangerousgoodsthatareessentialforitsownoperation,andisalsoacarrieroflargequantitiesofvariousdangerousgoods,thesemeasuresareofparamountimportance.Thispaperexamines,fromapointofviewoftheprotectionoflivesandhealthoftheparticipantsinthetransportprocessandthesafetransportofdangerousgoods,theconditionsofshipmentandtransportofdangerousgoods,theobligationsoftheparticipants,andtheessentialwaysfortheirproperhandling.Properapplicationofsafetyatworkpreventsimpromptuandindolentattitudeintransportingdangerousgoods,thuscontributingtoprotectionofpeoplelivesandhealth.Finally,thispaperincludespreventivemeasuresandbasicprinciplesforimplementationofsafetyatworkinthetransportofdangerousgoods.
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简介:摘要本文章简要讨论了在数学中有关圆的不遗漏、不重复的一些问题。通过典型例题与思维方法相结合,强调了师生不要忽视这种问题。
简介:AIMToevaluatetheclinicaloutcomesofpatientswhounderwentendoscopicsubmucosaltunneldissection(ESTD)foresophagealsquamouscellcarcinoma(ESCC)andprecancerouslesions.METHODSESTDwasperformedin289patients.Theclinicaloutcomesofthepatientsandpathologicalfeaturesofthelesionswereretrospectivelyreviewed.RESULTSAtotalof311lesionswereincludedintheanalysis.Theenblocrate,completeresectionrate,andcurativeresectionratewere99.04%,81.28%,and78.46%,respectively.TheESTDproceduretimewas102.4±35.1min,themeanhospitalizationtimewas10.3±2.8d,andtheaverageexpenditurewas3766.5±846.5dollars.Theintraoperativebleedingratewas6.43%,thepostoperativebleedingratewas1.61%,theperforationratewas1.93%,andthepostoperativeinfectionratewas9.65%.Esophagealstrictureandpositivemarginweresevereadverseevents,withanincidencerateof14.79%and15.76%,respectively.Notumorrecurrenceoccurredduringthefollow-upperiod.CONCLUSIONESTDforESCCandprecancerouslesionsisfeasibleandrelativelysafe,butforlargemucosallesions,therateofesophagealstrictureandpositivemarginishigh.