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简介：Thenaturalsupplyoflandresourcesislimited,buttheeconomicsupplymaychangealongwithsocialandeconomicdevelopment,anditssizeisdecidedbyenatureandsocialandeconomicbodyconditions.Whenthesupplyingabilityoflandresourcesthreatensthedevelopmentofsocietyandtheconflictbetweenpeopleandlandbecomestense,itforcedpeopletoim-provelandutilizationandtoincreasetheeffectivesupplyoflandresources.ThepapermadeanoverallconsiderationonthecharacteristicsoftheirrigatedfarmingandthefrailecologicalenvironmentinFuhaiCounty,AltayArea,XinjiangUigurAutonomousRegionandexploredlandarrangementplanningaswellaswaterresourceplanningandenvironmentalprotection.Thepaperevaluatednaturalresources,landutilizationandwaterresourceofthecasestudyareasandfocusedonthespatio-temporalbalancebetweentheutilizationofwaterandlandresources.Intheendthepaperafeasibleplanwasmadeoutforthelandarrangementproject.

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简介：Thispaperfocusesontheproblemofautomaticimageclassification(AIC)byproposingaframeworkbasedonlatentsemanticanalysis(LSA)andimageregionpairs.Thenovelframeworkemploysrelativespatialarrangementsforregionpairsastheprimaryfeaturetocapturesemantics.Thesignificanceofthispaperistwofold.Firstly,tothebestourknowledge,thisisthefirststudyoftheinfluenceofregionpairsaswellastheirrelativespatialinformationinlatentsemanticanalysisasappliedtoautomaticimageclassification.Secondly,ourproposedmethodforusingtherelativespatialinformationofregionpairsshowgreatpromiseinimprovingimagesemanticclassificationcomparedwiththeclassicallatentsemanticanalysismethodand2Dstringrepresentationalgorithm.

简介：Inthisarticle,the2-Dunsteadyviscousflowaroundtwocircularcylindersinatandemarrangementisnumericallysimulatedinordertostudythecharacteristicsoftheflowinbothlaminarandturbulentregimes.ThemethodappliedalternativelyisbasedonthefinitevolumemethodonaCartesian-staggeredgrid.Thegreatsourcetermtechniqueisemployedtoidentifythecylindersplacedintheflowfield.Toapplytheboundaryconditions,theghost-celltechniqueisused.Theimplementedcomputationalmethodisfirstlyvalidatedthroughsimulationoflaminarandturbulentflowsaroundafixedcircularcylinder.Finally,theflowaroundtwocircularcylindersinatandemarrangementissimulatedandanalyzed.Theflowvisualizationparameters,theStrouhalnumbers,anddragandliftcoefficientsarecomprehensivelypresentedandcomparedfordifferentcasesinordertorevealtheeffectoftheReynoldsnumberandgapspacingonthebehavioroftheflow.Theobtainedresultshaveshowntwocompletelydistinctflowcharacteristicsinlaminarandturbulentregimes.

简介：我们介绍处理计算含蓄地介绍的真实代数学的平面曲线的一个有限集合的安排的拓扑学的问题的一条新代数学的途径。当以古典方法使用大规模方法解决这个问题在手边时，介绍方法的主要成就是出现的荒谬的数字的完全的回避。因此，是值得提及建议方法的效率仅仅为低度的曲线被保证。

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简介：Marineaccidentshavecausedimmensecasualtiesonvariouspartiesinshippingandshipbuildingindustries,includingfinancialandstructurallosses.Thissituationmakesshipaccidentbecomesacriticalsubjectinnavalarchitectureandmarinestructures,asitneedscontinuousassessmentandinvestigationtobroadeninsightanddataofcollisionandgroundingphenomena.Thepaperaimstoinvestigatestructuralconditionsofashiparrangedbydoublehullsystemunderaccidentalscenario,namelyshipgrounding.Fundamentalconceptofstructure-rockinteractioninpoweredhardgroundingisadoptedtodesignimpactconfigurationforcalculationusingfiniteelement(FE)simulation.Involvedentitiesaredefinedasthestructurerepresentedbytankervessel,andoceanicrockisdeployedastheindenterinanalysis.Calculationresultsindicatethatthecrashworthinesscapabilityofstructuralpartstrengthenedbylongitudinalgirderishigherthanotherselectedlocationsonthestructuresagainstrockpenetration.Localizedfloodingofstorageoilmayoccurduringrakingdamageisformedonstructuralpartbetweentwogirders.

简介：Theoptimalarrangementofviscoelasticdampers(VEDs)usedtolinktwoadjacentshear-typestructuresunderseismicexcitationwasinvestigated.Atwo-stepoptimaldesignmethodisproposed.First,optimalparameterexpressionsoftheKelvinmodelareusedtocalculatetheoptimalstiffnessanddampingcoefficientoftheVEDs.Then,usingthetwo-stepoptimaldesignmethod,takingthequadraticperformanceindexastheoptimizationobjective,theoptimalarrangementofthedampersisdetermined.GeneralrulesabouttheoptimalarrangementoftheVEDswereobtained.Theresultsshowthattheplacementofonlyonedamperbetweentwoadjacentshear-typestructuresshouldbeavoided;ifmorethanonedamperisused,theyshouldbedistributedonthetopandlowerfloorsofthestructures.Optimizationofthenumberofdampershadlittleeffectonresponsereduction.Themostimportantfactorwastheoptimizationoftheplacementofthedampers.Throughcomparativestudy,forbuildingsofequalandunequalheights,theoptimalparametersofdampersfromparametricstudieswereshowntomatchthetheoreticalresultsfordifferentnumbersandplacementsofdampers.Thelevelofresponsereductionwasshowntobesensitivetothedampingcoefficientofthedampers.

简介：Conventionalcameracalibrationthatemployscalibrationtargetsisacommonlyusedmethodtoacquireacamera'sintrinsicand/orextrinsicparameters.Thecalibrationtargetsareusuallydesignedasperiodicarraysofsimplehigh-contrastpatternsthatprovidehighlyaccurateworldcoordinatesystempointsandthecorrespondingimagepixelcoordinatesystempoints.Theexistingpixelcoordinateextractionalgorithmscanreachasub-pixellevel;however,theytreateachsinglepatterninoneimageasanindependentindividual,whichmakesitdifficulttofurtherimproveextractionaccuracy.Inthispaper,anovelmethodisproposedbyutilizingtheperiodicarrangementcharacteristicsofthecalibrationtargetpatternasaglobalconstrainttoimprovethecalibrationaccuracy.Basedonacamera'spinholemodel,theintersectionpointoftwofittedcurvesisusedasanoptimizedpixelpointtoreplacetheinitialone.Followingthepixelcoordinateoptimizationprocedures,experimentswereperformedusingrealdatafroma3Dlaserlinescannerandadynamicprecisioncalibrationtarget.Ourresultsshowthattherelativeerrorsofcamerahomographymatrixelementsobtainedbytheproposedoptimizationmethodwerereducedcomparedwiththecommonlyusedmethod.Theaveragecoordinatemeasurementaccuracycanbeimprovedbynearly0.05mm.Itisshownthattheproposedoptimizationmethodcanenhancethecameracalibrationaccuracy,especiallywhentheextractedpixelsareofpoorerprecision.

简介：Flow-inducedvibrationoftwocircularcylindersintandemarrangementelasticallymountedwithamass-spring-dampingsystemwasstudiedbysolvingtheprimitivevariableNavier-StokesequationsincorporatingtheArbitraryLagrangian-Eulerian(ALE)method.Theconvectiontermanddissipationtermwerediscretizedusingthethird-orderupwindcompactschemeandthefourth-ordercentralcompactscheme,respectively.Thetypicalspacingbetweenthecylindersis4diameters,whichisclosetothecriticalvalue.Thedynamicresponseofthevibrationsontwocylinderswithtwo-degree-of-freedommotionisdifferentfromthatofanisolatedcylinder,andalsodifferentfromthatofacylindervibratinginthewakeofafixedupstreamone.Differentflowpatternswerefoundinthewake,andprovedtoberelevanttothediscontinuitiesobservedintheresponseoftheoscillatorycylinders.

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简介：Withtheincreasingnumberoflaserbeams,themaindifficultyinarrangingbeamguidingsystems(BGSs)involvesdeterminingthecorrespondingrelationshipsbetweentheoutputandinputportstorealizetheidentifiedlightpathlengthofallbeams.Giventhebasicconstraintsofgeometricarrangement,aBGSmodelisestablished,andabase-linealgorithmisproposedtoaddressthedifficultymentionedabove.Boundaryconditionsoftargetareaandtargetchamberarediscussedtoincreasethenumberoflaserbeams,andamaximumvalueexistsforaspecifictargetarea.Finally,thecompatibilityofacylindricalhohlraumtargetchamberwithasphericalhohlraumisanalyzed,andamoveablefinalopticsassemblyisproposedtoexecutetheswitchbetweenthetwodifferenttargets.

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