最新刊期
      卷 47 ， 期 3 ， 2015
      • Vol. 47, Issue 3, Pages: 1-5(2015) DOI: 10.15961/j.jsuese.2015.03.001
        摘要：Abstract:For an aerator with sudden lateral enlargement and vertical drop in free flow chute,the cavity length is governed by a number of independent parameters, including the Froude number,the ramp height of vertical drop, the ramp angle of vertical drop,and the lateral enlargement width of sidewalls,etc.Based on model experiments,the effects of above-mentioned parameters were observed on the bottom cavity length and the lateral cavity length.The results showed that the bottom cavity length is closely related to the ramp height,the ramp angle,the lateral enlargement width and the Froude number,and with higher ramp height,bigger ramp angle,wider lateral enlargement width,and higher Froude number,the bottom cavity length is longer.Yet the lateral cavity length is mainly connected with the lateral enlargement width and the Froude number,which has little relation to the ramp height and the ramp angle.For the lateral cavity length,it increases with the lateral enlargement width.At the condition of larger size of lateral enlargement,the lateral cavity length increases linearly with the Froude number,while a little decreases when the size of lateral enlargement is smaller.  
        关键词：cavitationsalleviationbyaeration;aerator;cavitylength;suddenlateralenlargementandverticaldrop;lateralaerator   
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      • Vol. 47, Issue 3, Pages: 6-13(2015) DOI: 10.15961/j.jsuese.2015.03.002
        摘要：Abstract:The stress concentration could be relieved by structure optimization with rounding on reinforced concrete bifurcation acute-angle-region.In order to study the influence of this measure on hydraulic characteristic, Realizable k-εmodel was adopted.Hydraulic characteristics were studied with practical construction based on CFD,including flow characteristics and head loss.Furthermore,the unevenness of fluid pressure value was compared quantitatively with different typical sections for the first time.The degree of unevenness to typical each section was defined by measurement criteria.The results indicated that the pressure value of pipe wall is uneven especially around acute-angle-region. It has a slight effect on head loss of bifurcation when the value of the acute angle rounding radius increasing.The flow pattern in bifurcation could be improved when the value of rounding radius about 0.5 times less than common tangent sphere radius under normal working condition.With the increase of the value of rounding radius the flow pattern could be deteriorated,and the unevenness of pressure value around acute-angle-region obviously would be increased.  
        关键词：hydropowerstation;reinforcedconcretebifurcation;rounding;hydrauliccharacteristics;pressuredistribution   
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      • Vol. 47, Issue 3, Pages: 14-20(2015) DOI: 10.15961/j.jsuese.2015.03.003
        摘要：Abstract:The particle image velocimetry (PIV) was used to characterize the fine structure of flow fields in a pool with an oblique submerged jet,and on this basis, the jet velocity distribution and turbulence characteristics in the wall-jet region were studied systemically.The results showed that in the wall-jet region,the velocity and turbulence intensity distribution in each of the jet flow cross-sections are the self-similarity,which is the same as that of a free jet. In the wall-jet region,the jet velocity decreases linearly along the jet path,whereas the turbulence intensity,the jet half-width increases linearly as the jet travels.The equations of jet velocity and turbulent intensity distributions were proposed,and the formulas to calculate the jet velocity,the turbulence intensity,the jet half-width changing along the jet path were also obtained.  
        关键词：submergedjet;thepool;thewall-jetregion;hydrauliccharacteristics;particleimagevelocimetry(PIV)   
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      • Vol. 47, Issue 3, Pages: 21-28(2015) DOI: 10.15961/j.jsuese.2015.03.004
        摘要：Abstract:Instabilityofcrackedlininginducedbyloosingloadinghasbeenacriticalscientificproblemduringoperationperiodfortunnel.Theloadingdeviceforatwo-lanehighwaytunnelmodeltestswasmanufactured.Thedevicecouldimposeloadonanypositionoflining.Itcanreinforcecrackedliningwhenitisundermechanicalcondition.Itsolvesthe‘bottleneck’problemofsecondaryloadingofreinforcementofcrackinglining.The1∶10modeltestswerecarriedouttoinvestigatestrengtheningeffectbyumbrellaarchunderloosingloading,suchasdeformationcharacteristic,mechanicalresponseandfailuremode.Thestiffnessofliningdeclineswithloadingincreasing.Thereinforcementwithumbrellaarchcanrepaircrackedliningeffectively,andincreaseitsstiffness.Itcanmakethebearingcapacityofseriouslycrackedliningdouble.Theoriginalliningdamagesatarch,spandrelandwall.Thecriticalcontrolledsectionsofumbrellaarcharearchandwall-footing.Compressive-bentdamageoflargeeccentricitytakesplaceatarch.Heavyreinforcementsaresuggestedforarchtoimprovetensilestrength.Diagonal crackandcompressive-shearappearatwall-footing.Sostirrupofwall-footingshouldbesupplementedtoupdateultimateshearingbearingcapacity.  
        关键词：tunnel;crackedlining;secondaryloading;reinforcementwithumbrellaarch;failuremode   
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      • Vol. 47, Issue 3, Pages: 29-36(2015) DOI: 10.15961/j.jsuese.2015.03.005
        摘要：Abstract:Based on the research of anti-slide pile in landslide control engineering,a new combined anti-slide pile was put forward,which is composed of three single piles,connecting by pile top beam,and has a higher stiffness and less deformation.In the landslide thrust,back row piles produce deformation,and the deformation directly effect on the soil between piles.Through the solution of additional stress of soil between piles,the additional effect of landslide thrust in the front row pile was calculated.By using the displacement earth pressure model,the pile flexural differential equation was established.This kind of anti-slide structure was applied to control Suoertou landslide in Zhouqu region,and the field measurements and theoretical calculation methods for the bending moments and displacement values were compared.The results showed that the proposed method is reasonable and feasible,and provides a basis for further study of the anti-slide piles’stress mechanism of the pile-soil interaction.  
        关键词：anti-slidepiles;displacementearthpressure;pilemoment;fieldtest;Suoertoulandslide   
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      • Vol. 47, Issue 3, Pages: 37-43(2015) DOI: 10.15961/j.jsuese.2015.03.006
        摘要：Abstract:To reveal the mechanism of dynamic cross effect and the structural behavior change caused by adjacent buildings,two comparative models of soil-structure system were designed.Under the same site soil conditions,one model included a single upper structure,and the other included five.Two shake table tests were carried out to obtain the reaction of the critical parts of the structures under the ground vibration excitation.The results showed that under earthquake,there is a significant interaction among the structures inside high rise building group.The settlements and the tilts of group buildings increase over the separate one.The frequency of the structure decreases because of the existence of adjacent buildings.The adjacent buildings make the acceleration response and the top displacement of the structure increase or decrease,which depends on the input seismic waves.The middle building’s reaction of acceleration and displacement are stronger than the surrounding buildings.  
        关键词：high-risebuildinggroup;shaketabletest;seismicresponse   
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      • Vol. 47, Issue 3, Pages: 44-52(2015) DOI: 10.15961/j.jsuese.2015.03.007
        摘要：Abstract:Inordertodetermineeffectivelythetemperaturefieldofreinforcedconcreteslabs,basedontheconventionaltemperaturetheory,theeffectofmoistureclogwastakenintoaccountbyintroducingthecorrectionfactorofmoisture,andthenonlinearfiniteelementprogramwasdevelopedforthetemperatureoftheconcreteslabs.Thedevelopedprogramwasusedtoanalyzetheeffectofcorrectionfactoronthetemperatureoftheconcreteslabs.Thecomparisonshowedthatthetheoreticalresultsareingoodagreementwiththetests,whenthecorrectionfactorofmoistureis2.0.Withintherangeofengineeringapplication,theeffectofparametersincludingthermalconductivity,evaporatingtemperature,theemissivity,theinitialdensityofconcreteandtheconvectioncoefficientonthetemperatureoftheconcreteslabswasanalyzed.Resultsshowedthatthethermalconductivityisthemainfactor,andtheemissivityofexposedsurfaceisthesecondaryfactoraswellastheconvectioncoefficientofunexposedsurface.Theevaporatingtemperaturehasanimportanteffectonthetemperatureplateauoftheslab’sunexposedsurface.Theinitialdensityofconcrete,theconvectioncoefficientofexposedsurfaceandtheemissivityofunexposedsurfacehavelessinfluenceontheslab’stemperature.  
        关键词：reinforcedconcrete;slab;finiteelement;temperaturefiled;moistureclog   
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      • Vol. 47, Issue 3, Pages: 53-63(2015) DOI: 10.15961/j.jsuese.2015.03.008
        摘要：Abstract:In order to study the contribution of segmental protection-wall to the horizontal bearing capacity of anti-slide piles,based on an artificial drilled anti-slide pile engineering,the model structure of segmental protection-wall and integral pile was designed by using similarity theory. With two same actuators of MTS respectively loading horizontally on the top of pile with protection-wall and of pile with no protection-wall, a model test with the scale of 1∶10 was carried out to study the interaction of segmental protection-wall and integral pile structure of anti-slide pile under horizontal load. By simultaneously loading horizontally of MTS actuators,the following results were achieved. Firstly, with the same horizontal displacement of pile top,the soil pressure at the bottom of pile with segmental protection-wall is larger than that of pile with no protection-wall,but the passive soil resistance on the top of pile is reverse,and reinforcing of upper passive soil of flexible pile could improve the horizontal bearing capacity.Secondly,with the same horizontal displacement of pile top,the maximum strain of tensile steel bar of pile structure with segmental protection-wall is always larger than that of pile with no protection-wall.With the increase of horizontal displacement of pile top,the section position of maximum strain of tensile steel bar of pile is moving down,but the moving velocity of section position of pile with protection-wall loges behind that of pile with no protection-wall.Furthermore,with the increase of horizontal load,the proportion of maximum strain of tensile steel bar with protection-wall than that of with no protection-wall increass first and then decreases,and the maximum proportion is 165.03% with the horizontal displacement of 30 mm and the minimum proportion is 20.23% with the horizontal displacement of 90 mm.Thirdly, with the horizontal displacement of pile top as the control standard of horizontal bearing capacity of pile,the horizontal bearing capacity of test pile in this paper increases more than 20%, and in the pile engineering practice,the contribution of horizontal bearing capacity improvement of segmental protection-wall can be computed by the formulas and reduction factor in the present work.  
        关键词：segmentalprotection-wall;artificialdrilledanti-slidepile;interaction;horizontaldisplacement;modeltest   
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      • Vol. 47, Issue 3, Pages: 64-70(2015) DOI: 10.15961/j.jsuese.2015.03.009
        摘要：Abstract:Thelowcyclefatigue(LCF)behavioroftheweldedjointoftheHRB400EⅢaseismicreinforcedbarspromotedintheearthquakeareasinChinawasinvestigated.TheLCFtestsunderuniaxialstraincontrolwerecarriedoutonaMTS809servo-hydraulictestingmachine.Thelowcyclefatigueproperties,suchasthecyclicstressresponsecharacteristics,thecyclicstress-strainrelationshipsandthefatiguelifepredictionmodelsofthebasemetalandtheweldedjointwereobtained.TheCoffin-Mansonparameterswerederivedfromthetestresults.TheSEMmicrographsrevealedthatmorethanonefatiguecracksinitiatedatthespecimensurfaces.Theresultsshowedthatthelowcyclefatiguelifeandthemicrofracturemechanismoftheweldedjointareobviouslydifferentfromthoseofthebasemetal.ThereasonsfortheobviousdifferenceoftheLCFpropertyandthemicrofracturemechanismoftheweldedjointwerealso revealedfromthechangeofthemechanicalproperties.  
        关键词：HRB400EⅢaseismicreinforcedbars;weldedjoint;lowcyclefatigue;mechanical properties   
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      • Vol. 47, Issue 3, Pages: 71-76(2015) DOI: 10.15961/j.jsuese.2015.03.010
        摘要：Abstract:Asuperresolution(SR)methodforremotesensingimagesbasedonsparsedictionaryandstructuralself-similaritywasproposed.Furthermore,comparedwithcorrespondencebetweenLRandHRimagepatchesfromaconventionalSRmethods,twodictionarypairs,i.e.primitivesparsedictionarypairandresidualsparsedictionarypair,arerainingdatabase.Theprimitivesparsedictionarypairislearnedtoreconstructinitialhigh-resolution(HR)remotesensingimagefromasinglelow-resolution(LR)input.However,theinitialHRremotesensingimagelosessomedetailscomparewiththecorrespondingoriginalHRimagecompletely.Therefore,residualsparsedictionarypairislearnedtoreconstructresidualinformation.Finally,self-similaritystructuralwidelyexistinremotesensingimagesandthisfeaturecan beusedtocorrectthereconstructedimagebynonlocalmeans(NLM)method.Experimentalresultsshowedthattheproposedalgorithmprovidesbettersubjectiveandobjectivequality,whencomparedtotheconventionalalgorithmsanditsPSNRis24.6905,SSIMis0.7363  
        关键词：remotesensingimages;super-resolution;dictionarylearning;sparserepresentation   
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      • Vol. 47, Issue 3, Pages: 77-82(2015) DOI: 10.15961/j.jsuese.2015.03.011
        摘要：Abstract:In order to reduce the "block artifact" in motion compensated frame interpolation (MCFI),a MCFI method with image inpainting was proposed.The method used multistage bidirectional motion estimation (ME) with variable size blocks to refine motion vectors (MVs) from coarse to fine.Then,the blocks which had searched the appropriate MVs were firstly used to produce the initial interpolated frame;otherwise,if they did not yet obtain suitable ME results,image inpainting was employed to fill the blocks and the whole interpolated frame was generated finally.The experimental results showed that this method outperforms other comparing algorithms in both objective and visual quality of the interpolated frame,and it is feasible as well since its low complexity.  
        关键词：motion compensated;videoframeinterpolation;3-Drecursivesearch(3-D RS);bi-directionalmotionestimation;imageinpainting   
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      • Vol. 47, Issue 3, Pages: 83-92(2015) DOI: 10.15961/j.jsuese.2015.03.012
        摘要：Abstract:For some complicated applications,Web service composition is a key issue to create value-added composite Web services from existent services,provided by different service providers.However,with an increasing number of Web services,selecting the ideal services for each task is difficult.To meet this challenge,a fuzzy Web services selection model was presented,then a consensus method was proposed for transforming the preference relations of users and providers into numeric weights that were used in the Tchebycheff distance computing. Finally an evolutionary algorithm was used to find efficiently preferred skyline solutions. Through a set of experiments, the effectiveness and robustness of this approach were evaluated.For the convergence results of top-k optimization objective, after having evolved about 60 generations,greater than 85% of optimal solutions could be found.For three crossover types of DWTD-EA, i.e. single-point,two-point and uniform crossover, when it evolved above 55 generations, single-point could converge to 80%, and the rest two types all could converge above 85%.  
        关键词：skyline;Webservicecomposition;consensus;preference   
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      • Vol. 47, Issue 3, Pages: 93-100(2015) DOI: 10.15961/j.jsuese.2015.03.013
        摘要：Abstract:A new nm-vehicle traffic flow simulation model, named as MD-EBCA, was proposed, in which the phenomemon of riding against the traffic flow was considered.The proposed model was used to explain the mechanism for　the formation of the m-vehicle and nm-vehicle mixed traffic flow.According to the behaviors of nm-vehicles,the new model enables the nm-vehicles to move in both logitudinal and lateral direction.The traffic phenomemon of the　nm-vehicle flow on ordinary roads which are equipped with road fences or those which are not equipped with road fences were analyzed speperately through the spatial-temperal diagram and the fundamental diagram.The simulation result showed that the free flow is presented on the nm-vehicle road when the road density is less than the critical density,and the linear relationship between the average flow rate and nm-vehicle numbers can be observed.The phase transition F-J are suggested by observing the spatial-temporal patterns in high density when the nm-vehicle road is completely isolated from the m-vehicle lanes.When the nm-vehicle road is not isolated from the m-vehicle lanes, the phase transition F-S can be observed in the same high density,and the m-vehicle and nm-vehicle mixed traffic flow is finally formed as the aggressive riders enter the m-vehicle lanes and return back to the nm-vehicle road when the traffic turns better.  
        关键词：multi-valueCA;simulation;mixedtrafficflow;trafficflowphasetransition   
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      • Vol. 47, Issue 3, Pages: 101-107(2015) DOI: 10.15961/j.jsuese.2015.03.014
        摘要：Abstract:In order to depict high dynamic of entity behavior quickly and accurately,a trust evaluation model based on continuous-time hidden Markov process was proposed. Different from the trust models on discrete-time hidden Markov chain,this model fully considered time dependence of trust,combined time intervals between the interactions and made the trust evaluation problem boil down to the learning problem of continuous-time hidden Markov process. Then an algorithm for solving the optimal parameters of hidden Markov process was given with the improved harmony algorithm,which could effectively guarantee the global search space and achieve a better solution.On this basis,the trust degree could be predicted using the existing interaction sequences and optimal parameters.Simulation results showed that the model is able to quickly reflect the dynamic of entity behavior,has high accuracy and resists the malicious attacks.  
        关键词：dynamictrust;hiddenMarkovprocess;harmonysearchalgorithm;trustdegree;adjustmentspace   
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      • Vol. 47, Issue 3, Pages: 108-113(2015) DOI: 10.15961/j.jsuese.2015.03.015
        摘要：Abstract:In order to deal with the lack of information sharing and resource re-utilizations,a novel personalized recommendation model was presented based on multi-scene fusion,and its function units,working flows and the scene data structure were given.The model utilized a distributed bidirectional description method to process scene data,and multi-scene fusion algorithms were used to exchange recommendation information between client characters and service scenes.Simulation results showed that the model has better coverage rates,recommendation precisions and resource consumption rate than the absolute node algorithms.  
          
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      • Vol. 47, Issue 3, Pages: 114-122(2015) DOI: 10.15961/j.jsuese.2015.03.016
        摘要：Abstract:Since querying with traditional cloaking region has brought too much communication cost due to the returned useless points of interest (PoI),a new cloaking region constructing method was proposed.Firstly,LBS server divided the whole map into cells according to PoIs’ locations with Voronoi partition,then the Voronoi partition was organized with quadtree into a hierarchical structure,the leaf nodes of the quadtree represented minimum grid cells,and each grid cell contained several PoIs;Finally,LBS server sent the subtree to a user according to the user’s fake location,the user got the PoIs distribution around him and constructed the cloaking region according to the distribution.The method protected the user’s location and query privacy,and the hormic PoI query decreased the communication cost of the useless PoIs.Performance analysis and experiments showed that this method increases the uncertainty of users’ private information to attackers,and its communication cost is lower.  
        关键词：location-basedservice;locationprivacy;nearestneighborquery;;l;-diversity   
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      • Vol. 47, Issue 3, Pages: 123-129(2015) DOI: 10.15961/j.jsuese.2015.03.017
        摘要：Abstract:To solve the problem of symbol detection in the intersymbol interference (ISI) channel of spatial diversity systems,an iterative blind equalization algorithm was proposed for single-input multiple-ouput (SIMO) communication systems based on the Gibbs sampler method.The conditional posterior distributions of all unknown quantities such as channel impulse response,transmitted symbol sequence were derived in SIMO systems.The unknown quantities were updated one by one from such conditional distributions,so that the maximum a posteriori (MAP) estimates of these unknowns were accomplished in an iterative manner.A salient feature of the equalization algorithm was that it had a soft-input soft-output (SISO) structure.Hence,it was well suited for iterative processing in a coded communication system,which allowed the blind equalization to improve its performance.Simulation results showed that the iterative blind equalization algorithm performs closely to the algorithm with channel response perfectly known to the receiver in severe ISI channels.Performance gap between this approach and channels with no ISI is only 1 dB.  
        关键词：single-inputmultiple-ouput(SIMO);blindequalization;Gibbssamlper;soft-inputsoft-output(SISO);iterativeequalizationanddecoding   
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      • Vol. 47, Issue 3, Pages: 130-136(2015) DOI: 10.15961/j.jsuese.2015.03.018
        摘要：Abstract:Aiming at the issue of immobility of differential reference station in GPS carrier phase differential positioning,an algorithm of GPS precise relative positioning for moving base station was proposed.Firstly,geometry free measurements were structured based on Melbourne-Wubbena combination,which were then filtered by moving average filter.The double difference processing was adopted to further eliminate common error when dynamic user comes into the data link coverage of moving base station,and then the wide lane ambiguities were obtained.At this time,Kalman filter observation equation was established in combination with carrier phase double difference geometry based model.Then multipath error was modeled as first order Gauss-Markov random process and brought into state equation as augmented state parameters,thereby accurate estimate of float solution ofL1/L2 ambiguity can be obtained.Lastly,the LAMBDA method was used to search the fixed ambiguity.Experiment results showed that centimeter level accuracy of relative positioning is obtained, which verifies the validity and applicability of the method.  
        关键词：globalpositioningsystem(GPS);movingbasestation;multipath;geometryfreemeasurement;integerambiguity   
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      • Vol. 47, Issue 3, Pages: 137-143(2015) DOI: 10.15961/j.jsuese.2015.03.019
        摘要：Abstract:The DC voltage droop control strategy of VSC-MTDC system can ensure proper distribution according to the converter ratings.However,it does not consider the actual loading condition.In order to solve this defect,a novel scheme for appropriate power sharing taking into account the available headroom of each converter station was proposed,and possible overloading was avoided.The margin droop control strategy was introduced in the active-power controller to ensure the stability of DC voltage.Transient simulations in PSCAD/EMTDC showed that the converters which are already operating close to the limits would try to share less burden of the loss to the extent of the other converters with higher spare capacity or headroom and thus the unbalanced power would be appropriate assigned.  
        关键词：voltagesourcedconverterbasedhighvoltagedirectcurrent;availableheadroom;adaptivedroop;margindroopcontrol   
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      • Vol. 47, Issue 3, Pages: 144-149(2015) DOI: 10.15961/j.jsuese.2015.03.020
        摘要：Abstract:In order to estimate the charge of battery exactly when the charging or discharging current with nonlinear uncertainty,an adaptive nonlinear damping based observer was proposed.With an adaptive parameter,the observer estimates the state of charge and the uncertainty in the current simultaneously.The proposed observer can well dominate the effects of the uncertainty caused by the voltage fluctuations,actuator failure or sensor measurement noise,etc on the estimation of charge.It was proved that the estimation errors are uniformly bounded.Furthermore,with well designed parameter,the estimation errors can reach arbitrarily small values.Simulation results illustrated the effectiveness of the proposed robust daptive battery charge observer.  
        关键词：stateofcharge;observer;charginganddischarginguncertainties;adaptation   
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      • Vol. 47, Issue 3, Pages: 150-153(2015) DOI: 10.15961/j.jsuese.2015.03.021
        摘要：Abstract:A fan warning model for curved roads was proposed based on millimeter wave radar.The method named virtual road simplification of the model was introduced.The related parameters of the model such as the actual following distance,the critical following distance,the velocity,and the acceleration were determined.The concept of driving safety margin,which is the ratio of the actual following distance and the critical following distance was introduced.A graded early warning mechanism was established based on driving safety margin. The simulation results showed that the fan warning model for curved roads could effectively reduce false alarms and leak alarms,and the model was feasible.  
        关键词：activesafety;automobilecrash-avoiding;fanwarningmodel;safetymargin;gradedcollisionwarning   
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      • Vol. 47, Issue 3, Pages: 154-159(2015) DOI: 10.15961/j.jsuese.2015.03.022
        摘要：Abstract:A measurement method of image fusion based on multi camera was proposed to avoid reduced accuracy and measurement error caused by mage occlusion, reflection and other reasons in multi-line structured light stereovision measurement system.The measurement method can be used on the prior multi-line structured light stereo vision measurement system hardware platform by updating its software.The fusion image can be created after these processes: extracting band images,image feature matching,matching band image with the line structure light knife which create the band image by using traditional stereo vision measurement method,converting all band images to a camera’s imaging plane,and realizing image fusion by resampling and interpolation of band images after coordinate transformation.Experiment proved that the method can greatly decrease reduced accuracy and measurement error caused by band image defects.  
        关键词：multi-linestructuredlight;stereovision;imagefusion;imagetransform   
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      • Vol. 47, Issue 3, Pages: 160-166(2015) DOI: 10.15961/j.jsuese.2015.03.023
        摘要：Abstract:Ring speed ratio and whirl ratio of shaft are critical indicators of power consumption and stability of floating ring bearing for turbocharger rotor system supporting.Based on the classic short bearing method,an analytical model of nonlinear dynamic oil-film force of floating ring bearing was presented,and precession angular velocities of floating ring and shaft were token into account in this model.The curves of ring speed ratio-shaft rotating speed and whirl ratio of shaft-shaft rotating speed were got.At different rotating speeds,the dynamic influence mechanisms of system parameters,i.e. eccentric mass,lubricant viscosity,structural parameters of floating ring bearing on speed ratio,and the sensitivity of speed ratio to parameters were studied.The results could be used as an reference to the R&D design of floating ring bearing and system performance evaluation of turbocharger rotor system.  
        关键词：floatingringbearings;ringspeedratio;whirlratio;systemparameters;transientload;turbochargers   
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      • Vol. 47, Issue 3, Pages: 167-173(2015) DOI: 10.15961/j.jsuese.2015.03.024
        摘要：Abstract:To achieve the high precision non contact dispensing in the technology of electronic packaging and SMT,a piezoelectric jetting valve was designed, which utilizes the hydraulic amplifier principle to amplifying the output displacement of piezo-stack.Firstly,jetting dispensing model was set up, and the factors affecting the velocity and pressure distribution generated by the needle crashing into the nozzle were analyzed by FLUENT software.Then,the relations among the jetting dispensing precision and striking velocity,adhesive viscosity and pressure of supplying adhesive can be obtained by changing different boundary conditions.Finally,the experiment test system was set up, and the result showed that the jetting dispensing precision is closely relative to above factors.Choosing the epoxy viscosity ranges from 500 to 3 500 MPa·s,dispensing properties were tested, and the test results showed that when the pressure of supplying adhesive is 0.2 MPa,square-wave driving voltage 110 V (up level 5 ms, low level 5 ms), the adhesive viscosity 3 500 MPa·s,droplets of minimum volume 0.24 μL could be obtained using the jetting valve system and conformity error is about 6.62%.  
        关键词：electronicspackaging;jetdispensing;hydraulicamplified;piezoelectricdriven;flowfieldsimulation   
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      • Vol. 47, Issue 3, Pages: 174-179(2015) DOI: 10.15961/j.jsuese.2015.03.025
        摘要：Abstract:Thegashold up,liquidcirculationvelocityandvolumetricoxygenmasstransfercoefficientwereinvestigatedbyexperimentsinaninternalcirculationthree-phasebiologicalfluidizedbedreactorwiththreedifferentgasdistributors.Theresultsshowedthat,besidesthegasflowrateQg,thegasholediameterandtheholenumberperunitareaofdistributorarealsoimportantfactorsthataffectgasholdupεginsidethereactor.UnderagivenQg, thedistributorwithsmallerholehelpstoachievehigherεg(asdidthemicroporedistributorinthiswork),buttheover-denselydistributedholesondistributorwillcausethesmallbubblestomergeintolargebubbles,leadingtodecreased εg(asdidtheceramicdistributorinthiswork).Forthecasesoflowergasflow-rate (Qg<260L/h),theliquidcirculationvelocityUcmainlydependsonthegasholdupdifferenceΔεgbetweenriseranddowncomer,whileforthecasesofhighergasflow-rate,both Δεgandflowresistancearedominatingfactors.WhenQg keepsconstant,thedistributorwhichachievesalargerΔεgleadstoahighercirculationvelocity.Thevolumetricoxygenmasstransfercoefficient KLaincreaseswithincreasingQg,towhichtheincreasedspecificsurfaceareacontributesmostly.Underagiven Qg,thedistributorwhichachievesahighergasholdupresultsinahighermasstransfercoefficientKLa.  
        关键词：Three-phasefluidizedbedreactor;gasdistributor;gashold-up;liquidcirculationvelocity;volumetricmasstransfercoefficient   
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      • Vol. 47, Issue 3, Pages: 180-186(2015) DOI: 10.15961/j.jsuese.2015.03.026
        摘要：Abstract:Mn and Ce were loaded on the coconut-hell-based activated carbon treated by nitric acid (ACN) using impregnation method for low temperature selective catalytic reduction (SCR) of NO with NH3.The catalytic activity was evaluated at a fixed-bed,and,the loading order and loading amount of Ce and Mn were studied.The Catalysts were characterized by BET,SEM,XRD and XPS.The results showed that the Ce adding to Mn/ACN improves significantly the denitration activity of catalyst;when temperature is higher than 90 ℃,when the removal rate of NO achieves 90% and maintains 100% at 120~250 ℃.The loading sequence and amount of active component are important factors for influencing catalyst activity.When 5% Ce and 5% Mn were simultaneously loaded on ACN,the catalyst exhibits the best denitration performance.Mn loading on activated carbon can reduce the specific surface area and pore volume of active carbon,and the specific surface area and micro pore volume of Mn-Ce/ACN with 5% Mn and 5% Ce decrease to 695.0 2/g and 0.130 cm3/g;with the increase of loading,specific surface area and pore volume further decrease;Mn loading with 10% Ce increases to 10%,the specific surface area and micro-pore volume have only 539.8 m2/g and 0.106 cm3/g.Mn3+and Mn4+coexist in Mn/ACN and Mn-Ce/ACN.Ce4+and Ce3+coexist in Mn-Ce/ACN and improve the slight increase of Mn4+content,leading to the best denitration activities.  
        关键词：low temperature;SCR;activated carbon;Mn;Ce   
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      • Vol. 47, Issue 3, Pages: 187-192(2015) DOI: 10.15961/j.jsuese.2015.03.027
        摘要：Abstract:Three kinds of GA-NH-PBLA with different molecular weight were synthesized by the ring opening polymerization of N-carbobenzoxy-L-aspartic acid benzyl ester (BLA-NCA) initiated by GA-NH2. Their structures were characterized by 1H-NMR, FT-IR.The molecule weights were measured by GPC.The cytotoxicity of GA-NH-PBLA was investigated to evaluate the security by MTT assay against human hepatoma cells (HepG2). Result demonstrated that the material had no significant cytotoxicity. The material was processed into NPs loaded paclitaxel (PTX) via emulsion solvent evaporation method, the influence of different weights on the particle size, encapsulation efficiency and loading capacity was investigated, and the release in vitro was evaluated in vitro release study. Results showed that NPs formed from the polymer of 5 550 were spherical in shape with about 100 nm in size and the NPs had a good sustained release effect in PBS buffer solution. The study indicated that the material with high molecular weight was more suitable for being used as drug carrier.  
        关键词：glycyrrhetinic acid;PBLA;Nanoparticles;paclitaxel   
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      • Vol. 47, Issue 3, Pages: 193-199(2015) DOI: 10.15961/j.jsuese.2015.03.028
        摘要：Abstract:The effects of six chemical modification agents of acetic acid, citric acid, sodium citrate, SDS, sodium chlorite, and HDTMA on the removal rates of low concentration of ammonia nitrogen, nitrate nitrogen and COD by zeolite were studied. The results showed that the zeolite modified by 0.05 mol/L of sodium citrate has the largest ammonia nitrogen removal rate, which is 98.14%, the zeolite modified by 0.05 mol/L of HDTMA has the largest nitrate nitrogen removal rate, which is 24.81%; and the zeolite modified by 0.05 mol/L of citric acid has the largest nitrate nitrogen removal rate, which is 42.57%. There is a positive correlation between cation exchange capacity and the removal efficiency of ammonia nitrogen. The effects law of different modification agent on the removal rates of ammonia nitrogen, nitrate nitrogen and COD by zeolite was obtained. The removal rates of ammonia nitrogen, nitrate nitrogen and COD by sodium citrate modification zeolite are higher than those of raw natural zeolite.  
        关键词：natural zeolite;chemical modification;ammonia nitrogen;nitrate nitrogen;chemical oxygen demand   
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      • Vol. 47, Issue 3, Pages: 200-206(2015) DOI: 10.15961/j.jsuese.2015.03.029
        摘要：Abstract:Theobjectiveofthisarticlewasexploringtheleachingkineticsofarseniccontainedinhigharsenicdust.Higharsenicdustfromleadsmelterwasprocessedbyleachingwithwater.TheeffectsofpH,liquid-solidratio,reactiontimeandtemperatureontherateofarsenicleachingwerestudied,andSEM,XRDandEDSwereemployedtocharacterthestructureofrawmaterialandleachresidueforinvestigatingthekineticsofarsenicleachedfromdust.Itwasdemonstratedthattheliquid-solidratioandleachingtemperaturehasthegreatestinfluenceontheleachingrate,andthattheleachingkineticsofarseniciscorrespondentwiththeJohnson-Mehl-Avrami(JMA)model.Thediffusionisthebottle necklimitingleachingrateofarsenicwithintheselectedtemperaturerange,andthekineticequationis-ln(1-α)=9.4×106 exp[-503 80/(RT)]t0.310 6withtheleachingprocessfrequencyfactorof9.4×106andtheapparentactivationenergyof50.38kJ/mol.  
        关键词：higharsenicdust;hazardssolidwaste;leaching;kinetics   
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