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简介：Inthispaper,theperformancecharacteristicsofASTMA19QS31803andASTMA1S2F51duplexstainlesssteelwereintroduced,andtheweldabilitieswereanalyzed.Theweldingrepairproceduresofthickwallduplexstainlesssteelweredevelopedbyweldingprocedurequalification.Researchshowsthattherepairweldinghaslesseffectonmechanicalpropertiesofweldedjointsandgreatinfluenceonphaseproportionsandpittingcorrosionresistance.Thetestresultsmeettherequirementsofprojectspecifications.Therepairweldingprocedurecanbeusedinproject,andonlyonetimerepairshallbeused.

简介：TheSargentdividingwallcolumncanimplementfourproductsseparationsequencesinonecolumnbasedonFullyThermallyCoupledDistillationColumn.TheinitialdesignparametersarerequiredforthedesignoptimizationordynamiccontroloftheSargentdividingwallcolumn,andinordertomaketherigoroussimulationoftheSargentdividingwallcolumnmoreconducivetoconvergence,atencolumnmodelforcomplexSargentcolumnisestablishedinthispaper,andtheshortcutdesignmethodofthismodelisproposed.TheinternalminimumvaporandliquidflowareobtainedbytheUnderwoodequationsandthemassbalancemethodandtheV-minmethod.Theseparationfora4-componentshortcutmixtureofpentane,hexane,heptaneandoctanewasconsidered,whiletheinitialvaluesofdesignparametersandtheratioofvapor-liquiddistributionofeachcolumnwerecalculatedbyusingtheshortcutdesignmethodofatencolumnmodel.Andbycomparingtheshortcutcalculationswithrigoroussimulationresults,thepracticalityandreliabilityofshortcutcalculationswereverified.Thereasonforenergysavingwasanalyzedbasedonback-mixing.AvirtualheatexchangerisproposedtomaketheSargentdividingwallcolumnmoreenergyefficient.

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简介：基于逻辑的联合的A和在一个爬墙的机器人的一个吸脚控制系统的差错察觉和鉴定(FDI)的基于模型的途径在这篇论文被介绍。为控制系统，一些差错模型被kinematics分析导出。而且，系统状态的逻辑关系预先被知道。首先，一棵差错树被用来由评估基本事件(基本原因)分析系统，它能导致一个根事件(一个特别差错)。然后，一个多重模型的适应评价算法被用来检测并且识别知道模型的差错。基于机器人的系统状态和评价的结果，最后，模型未知的差错也用逻辑推理被识别。实验证明建议途径在机器人的FDI基于逻辑推理并且模型估计的联合是有效的。

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简介：Theaimofthispaperistopresentananalyticalexpressionforthestreamwisevelocitydistributioninanon-uniformflowinthepresenceofwaves;thecorrelationbetweenthehorizontalandverticalvelocitycomponentshasbeencomprehensivelyexamined.Differentfrompreviousresearcheswhichattributedthedeviationofvelocityfromtheclassicallog-lawtothewaveReynoldsstress,i.e.-ρ(uv)only,thisstudydemonstratesthatthemomentumfluxcausedbymeanvelocities,i.e.,(u)and(v),isalsoresponsibleforthevelocitydeviation,anditisfoundthatthestreamwisevelocityforaflowinthepresenceofnon-zerowall-normalvelocitydoesnotfollowtheclassicallog-law,butthemodifiedlog-lawproposedinthisstudybasedonsimplifiedmixing-lengththeorem.Thevalidityofthemodifiedlog-lawhasbeenverifiedbyuseofavailableexperimentaldatafrompublishedsourcesforcombinedwave-currentflows,andgoodagreementbetweenthepredictedandobservedvelocityprofileshasbeenachieved.

简介：Wall-boundedturbulentflowinvolvesthedevelopmentofmulti-scaleturbulenteddies,aswellasasharplyvaryingboundarylayer.Itstheoreticaldescriptionsareyetphenomenological.Wepresenthereanewframeworkcalledstructuralensembledynamics(SED),whichaimsatusingsystematicallyallrelevantstatisticalpropertiesofturbulentstructuresforaquantitativedescriptionofensemblemeans.AnewsetofclosureequationsbasedontheSEDapproachforaturbulentchannelflowispresented.SEDorderfunctionsaredefined,andnumericallydeterminedfromdataofdirectnumericalsimulations(DNS).ComputationalresultsshowthatthenewclosuremodelreproducesaccuratelythesolutionoftheoriginalNavier-Stokessimulation,includingthemeanvelocityprofile,thekineticenergyofthestream-wisevelocitycomponent,andeverytermintheenergybudgetequation.ItissuggestedthattheSED-basedstudiesofturbulentstructurebuildsabridgebetweenthestudiesofphysicalmechanismsofturbulenceandthedevelopmentofaccuratemodelequationsforengineeringpredictions.

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简介：Thecontrolofturbulencebydimples/pimpleshasdrawnmoreandmoreattention.Theobjectiveofthispaperistoinvestigatetheeffectivenessoftheactivedimples/pimplesforthedragreductionintheincompressibleturbulentflow.Firstly,thedragreductionbytheoppositioncontrolbasedonactivedimples/pimplesatthelowerwallisstudiedviathedirectnumericalsimulationoftheturbulentchannelflow.Itisfoundthatlargeactivedimples/pimplescannotsuppressthestreamwisevorticessignificantlyandthusalmostnodragreductionisachieved.Smallactivedimplesandpimpleswiththediameterofonefourthofthestreakwidthcanbothreducethefrictiondrag,butpimpleswillinducealargerpressuredragthandimples.Thenthesuboptimalcontrolschemeisexaminedbasedonsmallactivedimplesusingthespanwisewallshearinformationonly.Itisshownthatthefrictiondragdecreasesbyabout4.5%butthetotaldragisonlyreducedbyabout2.7%abatedbythepressuredrag.Comparedwiththeactuationoftheall-pointblowing/suctionortheall-pointwallmovement,theeffectivenessoftheturbulentdragreductionbasedonactiveshallowdimplesismuchsmaller.

简介：AcousticBarkhausenEmission(ABE)andElectromagneticBarkhausenEmission(EBE)havebeenmeasured.Explanationsofthere-sponseofnickeltoanappliedmagneticfieldareconsideredusingenergydensitydiagramsandcriticalfieldsdeducedusingKersten’smodifiedtheory.ThesetheoreticalmodelsarecorrelatedwithABEandEBEmeasurements,providingfurtherconfirmationoftheoriginsofABEbeingnon-180°domainwallmotion.Thispaperalsoshowsthatthemotionofdomainwalls,onincreasingthemagnetisingfieldsfromsaturationtosatu-ration,followsthesequenceof71°-180°-109°.Valuesofcriticalfieldscorrepondingto71°,180°and109°wallmotionsinnickelarede-terminedusingthesetechniques.

简介：Theanatomycharacteristicsofcellwallandlignindistributionindifferentanatomicalregionsfor12-month-oldbamboospeciesPseudosasaamabiliswasinvestigated.Thelignindistributionwasstudiedbymeansofopticalmicroscopeandconfocallaserscanningmicroscopeandthecolorreaction.Inaddition,thedistributionofligninindifferenttissues(fiber,parenchymaandvessel)wasinvestigatedbyvisible-lightmicrospectrophotometrycoupledwiththeWiesnerandMaulereaction.Thecellwallsofdifferenttissueswerealllignifiedandtheligninwaswidelydistributedindifferenttissues,inwhichtherewasadifferencebetweentissuesandanatomicalregionsinlignincontent.Guaiacylligninandsyringylligninunitcouldbefoundincellwalloffiber,parenchymaandvesselthroughWiesnerandMaulereactionandtheabsorbancepeakofspectrum.Therewasnoregularvariationinlignincontentwithdifferentradiallocationofculmsanddifferentlocationinfiberstrands.Thelamellationofthefibercellwallwasgenerallyhadasalternatingbroadandnarrowlayerswithalternatinglowandhighconcentrationoflignin.

简介：称为走的墙框架结构的一个新结构的系统在这研究被建议解决产出RC框架的问题的底部，它广泛地在中国发生在象Wenchuan和Yushu地震那样的以前的地震期间。平常的RC框架模型和一个走的墙框架建模的A1/5规模被使遭到一起摇桌子运动学习新结构的系统的地震行为。这份报纸在低、中等、高的紧张摇晃下面论述动态特征，地震回答和失败和二个模型的倒塌机制。测试结果和进一步的分析证明走的墙框架结构的地震表演以控制得好的变丑模式和更一致地分布式的损坏比平常的RC框架优异。走的墙能有效地压制产出机制的底部，并且为设计实践简单、节俭、实际。

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简介：Aproblemofunsteadyflowofasecondgradefluidoverflatplateswiththeimpulsiveandoscillatingmotion,startingfromrest,andwiththewalltranspirationisconsidered.TheexactsolutionsarederivedbytheLaplacetransform,theperturbationtechniques,andanextensionofthevariableseparationtechniquetogetherwithsimilarityarguments.Thesesolutionsarewrittenasthesumbetweenthepermanentsolutionsandthetransientsolutions.Thevariationsoffluidbehaviorswithvariousphysicalparametersareshowngraphicallyandanalyzed.Theresultsarevalidatedbycomparingthelimitingcasesofthepresentpaperwiththeresultsoftherelatedpublishedarticles.

简介：AbstractPurpose:To evaluate the outcomes with and without aid of a computer-assisted surgical navigation system (CASNS) for treatment of unilateral orbital wall fracture (OWF).Methods:Patients who came to our hospital for repairing unilateral traumatic OWF from 2014 to 2017 were included in this study. The patients were divided into the navigation group who accepted orbital wall reconstruction aided by CASNS and the conventional group. We evaluated the surgical precision in the navigation group by analyzing the difference between actual postoperative computed tomography data and preoperative virtual surgical plan through color order ratios. We also compared the duration of surgery, enophthalmos correction, restoration of orbital volumes, and improvement of clinical symptoms in both groups systemically. Quantitative data were presented as mean ± SD. Significance was determined by the two-sample t-test using SPSS Version 19.0 A p < 0.05 was considered statistically significant.Results:Seventy patients with unilateral OWF were included in the study cohort. The mean difference between preoperative virtual planning and actual reconstruction outcome was (0.869 ± 0.472) mm, which means the reconstruction result could match the navigation planning accurately. The mean duration of surgery in the navigation group was shorter than it is in the control group, but not significantly. Discrepancies between the reconstructed and unaffected orbital-cavity volume and eyeball projection in the navigation group were significantly less than that in the conventional group. One patient had remnant diplopia and two patients had enophthalmos after surgery in the navigation group; two patients had postoperative diplopia and four patients had postoperative enophthalmos in the conventional group.Conclusion:Compare with the conventional treatment for OWF, the use of CASNS can provide a significantly better surgical precision, greater improvements in orbital-cavity volume and eyeball projection, and better clinical results, without increasing the duration of surgery.

简介：Inthispaper,thebasicequationsgoverningtheflowandheattransferofanincompressibleviscousandelectricallyconductingfluidpastasemi-infiniteverticalpermeableplateintheformofpartialdifferentialequationsarereducedtoasetofnon-linearordinarydifferentialequationsbyapplyingasuitablesimilaritytransformation.Approximatesolutionsofthetransformedequationsareobtainedbyemployingtheperturbationmethodfortwocases,i.e.,smallandlargevaluesofthesuctionparameter.Fromthenumericalevaluationsofthesolution,itcanbeseenthatthevelocityfieldatanypointdecreasesasthevaluesofthemagneticandsuctionparametersincrease.Theeffectofthemagneticparameteristoincreasethethermalboundarylayer.Itisalsofoundthatthevelocityandtemperaturefieldsdecreasewiththeincreaseinthesinkparameter.

简介：Thelevelsetmethod,TVDschemeofsecondorderupwindprocedurecoupledwithfluxlimiter,ENOvelocityextensionprocedureinsidethebubble,andMACprojectionalgorithmwereincorporatedtosimulatethewholecollapseevolutionofacavitationbubbleneararigidwallwithmanycomplicatedphenomena,suchastopologydistortionandshrinking,jetimpact,bubblebreakingintoatoroidalform,anddiminishingvolumetozero,etc.Thebubbleshape,evolutionanddistributionofvelocityandpressurefieldsofthefluidduringthebubblecollapsingwereinvestigated.Itisfoundthatthemethodisnumericallystableandhasgoodconvergenceproperty,andtheresultsareingoodagreementswiththoseinpreviouswork.

简介：Hegu(LI4)andTaichong(LR3)aretheYuan-PrimaryacupointsoftheLargeIntestineandLiverMeridian,andarecollectivelynamedasSiGuan(fourgates)point.Combineduseofthesetwoacupointscanharmonizeyinandyang,regulateqi

简介：AbstractShark attacks are rare unique pathological processes. Some of them represent devastating injuries with a high morbidity and significant mortality. Related published articles are limited. The increased human interaction within the environment of sharks is the cause of rising incidence of such attacks. This study reported a case of level 4 shark injuries (shark-induced trauma scale) in a 33-year-old male patient, who presented with an extensive injury of the right lower limb with the characteristic features of shark bite. At admission the patient was in a state of shock with profuse bleeding that was controlled by tourniquet. The patient was resuscitated according to the advanced trauma life support. Clinical examination showed hard signs of vascular injury with absent pedal pulse, associated neurological deficits and severance at the knee joint. Prompt vascular intervention after resuscitation was performed to manage the major vascular injuries, together with proper washout and debridement of all the necrotic tissues under strong antibiotic coverage to prevent infection. After that, the patient underwent sequenced plastic, orthopedic, and neurological interventions. Strict follow-up was conducted, which showed that the patient was saved and achieved a functioning limb. This study aims to highlight the management of level 4 shark injuries, which are considered serious and challenging with a high fatality rate and a great risk of amputation due to the associated major vascular injuries. Immediate well organized management plan is crucial. Prompt resuscitation and surgical intervention by a highly-skilled medical team are required to improve the chance of patient survival and limb salvage.