Research on deformation failure mode of slope diseases caused by earthquakeEI北大核心

Research purposes: The slope diseases caused by earthquake are different from other types of slope diseases in general. They have various mechanism and deformation failure modes and can cause large damages. In order to prevent and control these diseases pointedly, based on investigations of 3 slope diseases along the Wenchuan-Yingxiu Road influenced by the "5·12"Wenchuan Earthquake, the analyses and researches were made and done on the slope diseases types, slope structures and mechanism to summarize the deformation failure modes of slope diseases caused by earthquake. Research conclusions: (1) The main types of slope diseases include the collapse, landslide, slumping, fault and rockfall. Collapse is the major disease, up to 71% of the total slope diseases. About 80% diseases happens to rock slope. (2) The deformation failure modes of collapse have 8 types like pull cracking and falling.Landslide has 5types like pull cracking, shearing off and sliding. Slumping has 2 types of shaking loose and slumping. Rock falling has 2 types of throwing and dropping. Disorder falling has 1 type of shaking to crimping. (3) This research result can provide the reference to prevention and control of the slope diseases caused by earthquakes along railways and roads.     

市郊列车用全封闭式永磁同步电动机

风冷式感应电动机广泛用作铁道车辆的牵引电动机.但它们需要大修进行内部清洁,而且还是噪声的主要来源.为解决这些问题,建议使用全封闭式永磁同步电动机作牵引电动机,它具有与传统的风冷式感应电动机相同的功率-重量比.报告了温升试验、噪声测定和能耗计算的结果.结果表明噪声等级下降10 dB,能耗约降低10%.     

Test Analysis of the Vibration Response of Trough Girder Bridge in the Small Radius CurveEI北大核心

Research purposes: The bridge in circinate line of Hefei Railway Hub was built in the curve with radius of 300 m. In order to reduce structural height of the bridge across the Huainan railway, the single-line simple trough girder bridge with 32 m span was applied. The lateral vibration of the vehicle and bridge is intensified under the action of centrifugal force, and the torsion effect is obvious when the train running on the bridge in the small radius curve. On the other hand, the torsional rigidity of the trough girder with open section is lower than that of the closed box girder. Moreover, the wheel lateral force and the derailment coefficient is increased, and the reduction rate of wheel load is also increased owing to centrifugal force caused by unbalanced superelevation. In order to ensure the safe and smooth operation of the train and reveal the dynamic performance of the trough girder bridge in the small radius curve, the vibration response of the single-line trough girder bridge is tested and analyzed. Research conclusions:(1) The measured vertical and horizontal fundamental frequencies of the trough girder bridge are obviously larger than the vertical self-vibration frequency limit given by the relevant specification and the normal value of the measured transverse minimum natural vibration frequency. The lateral stiffness of the bridge is mainly controlled by its foundation stiffness. (2) The stiffness of the bridge can meet the requirements of C62 freight train safe running on the trough girder bridge in the curve with radius of 300 m at a speed of not more than 40 km/h. (3) The transverse vibration response of the bridge consists of the transverse static response of the structure caused by the centrifugal force and the lateral dynamic response caused by the coupling vibration of the vehicle-bridge system. (4) The research results can be referenced in the design of the railway bridge in the curve and coupled vibration analysis of trains and bridge in the small radius curve. © 2018, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

LOW-COST HIGH PERFORMANCE CLUSTER OF WORK- STATIONS BASED ON DYNAMIC LOAD BALANCING FOR PARALLEL DEPTH-FIRST SEARCH(DFS)

IntroductionTraditionally,supercomputers have been builtwith high performance processors,which use tech-niques to execute as many computations concur-rently as possible.This machine employs a numberof arithmetic units,and sufficient hardware to al-low them to be fed with data and instructions attheir peak rate. Supercomputers built as parallelprocessors have also contained special shared mem-ory or message passing hardware as an integralpart of the machines design. This special hard-ware,in co…     

心腔导管电消融治疗顽固性室上性心动过速

对17例抗心动过速药物治疗无效的顽固性室上性心动过速的患者,经使用心内导管电消融房室交界区,采取R波同步放电200～400J电能2～1次后,其中4例在电消融术后未安置长期心脏起搏器,另13例电消融术后形成完全性房室传导阻滞,安置了长期性心胜起搏器。临床实践证实了使用心腔导管电消融术对治疗顽固性室上性心动过速,可收到较好的效果。     

INTERFERON γ－INDEPENDENT EFFECTS OF INTERLEUKIN 12 ADMINISTERED DURING ACUTE OR ESTABLISHED INFECTION DUE TO LEISHMANIAMAJOR

ＩＮＴＥＲＦＥＲＯＮγ－ＩＮＤＥＰＥＮＤＥＮＴＥＦＦＥＣＴＳＯＦＩＮＴＥＲＬＥＵＫＩＮ１２ＡＤＭＩＮＩＳＴＥＲＥＤＤＵＲＩＮＧＡＣＵＴＥＯＲ　ＥＳＴＡＢＬＩＳＨＥＤＩＮＦＥＣＴＩＯＮＤＵＥＴＯＬＥＩＳＨＭＡＮＩＡＭＡＪＯＲＺｈｅｎｇＳｈｉｃｈｕｎ；Ｗ...     

An Internal State Variable Model for the Low Temperature Tempering of Low Alloy Steels

QuanitativelyaccuratePredictionsofquenchinduceddistOnionandresidualstressrelyontheabilitytopredictthemicrosthectUralevolUtionthroughOutthequenchProcess.InlowaIloysteels,cUrrenresearchMshavefOcusedontheformationldneticsoffetrite,pearlite,bainiteandmartensite.However,temPeringcanhavealargeinfluenceondistOnionandresidualstrCss,andeffortstoaccountforthislagbehindthemodelingofthePrimnyphasetransihons.AsafirststeptowardsaccountingfortemPerillg,wehavedevelOpedanintemalstatevariablemodelthatuses…     

Numerical Study of the Plastic Behaviour of a Low Alloy Steel during Phase Transformation

IntroductionItiswellknownthaphasetrapsformationsplayanimPortantroleontheresidualstressesandstrainsinducedbythermalprocessessuchasweldingandquenching.lnthispaPer,wefocusourattentiononthebehaviourofsteelsduringphasetransformations.AtheoreticalaPproachhasbeenachievedbyLeblondetal[1]andhasledtOamacroscopicmodelinthecaseofideal-plasticphases[2][3].Thenthemodelhasbeengeneralizedtotakestrainhardeningphenomenaintoaccount[4].ThetheoreticalaPproachhasbeenassessedandcompletedusingflniteelementsimulati…     

Computer simulation of thermochemical treatments: modelling diffusion and precipitation in metals

IntroductionThermochemicaltreatmentsarewidelyusedtoimProvethemechanicalprOPertiesofmetalliccomPonents.ForexamPle,inthecaseofsteel,hightemPeraturediffusionofcarbonand/ornitrogCnleadstoanincreaseofhardnessnearthesurface,aswellastolocalcompressiveresidualstfCsses.Bothcontributetoanincreaseofthelifetimeofthecomponent.Modellingdiffusioncanbeconsideredasrelativelystraightforward,sincethegoverningequationsarewellestablished.However,onemustaccountforthefactthatduringdiffusion,precipitationmayoccur…