Abstract:

Abstract: Though simulating the excaVation process and stability fhilure of soft clay excavation whose depth was24m bycomplex geotechnical centrifuge，the stability factors，failure characteristics and symptoms were researched．Resultsdisplayedthat the embedded role on controlling the”skining”defb瑚ationwasvery favorable，also the case fbr excaVation stabilitywhen thewaUtoeinserted in hardpan，but whenwall toe reacheda cenain depth，the innuence wasunapparent as the insert depthincreasing．Forthe typical soft clay in Shanghai，critical insertion depthratio of retaining wall is 0．7．The failure symptomswere as follows：(1)The skirting deformation ofretaining wallwasobVious and its quantity valueis about 1／3 ofthemaximumhorizontal displacement ofthe wall．(2)Themasstransversal cracks arise whenthe surfacesubsidenceoutsideof excavation reached 1．38％日(日一excaVation depth)．(3)The upheaval of bottom increases rapidly，the value reached 3．1～3．8％日，and near the retaining wall greater than the central．(4)Pit soilwasin the passive earth pres— sure limit state．The destruction slip surface characteristics were obtained byanalyzing failure phenomena．

Abstract: Pushovertheory has not only been widely used in elastic seismic analysis of the stlllcture，but also can accurately describe ultimate bearing capacity andfailure ofweak point of the stnIcture．According to the relationship betweenmoment—curvature of conerete filled steel tubular membersbased on the unified theory，the moment-rotation relationship in elastic-plastic state is deduced，and the calculation method of】Ⅵhinge and PMMhinge properties are put for’ward．Basedon the test results ofsimply—supported girder withconcrete filled steel tubulart11lss，the feasibility of proposed practical calculation method is verified．The comparison results showthat the calculation method to dete瑚ine plastic hinge properties of concrete filled steel tubularmembers is reasonable，and the analysis onthe ultimate bearing capacity of CFSTTrussGirder is credible，which pro— vides an ef耗ctive theoretical basis and research methods to grasp the large steel—concrete composite truss b而dge in elastic—plastic stage static anddynamic pe矗．o珊ance．

Abstract: Geogridcanimprove the tensile strength，shearstrength andoVemll stabilitysignificantly when it is used as reinforcementfor ground．Basedonthe discreteelementmethod software PFC2D，anumericalmodel is established to studythegeogrid reinforced soil．Compared with unreinforced soil，thefoUowing studies are ped．onned：the settlement of fbundation and the lateml and Vertical displacement distribution of soil with depth．Then，aparametric studyis carried outto investigate the bearingcapacity of fbundationandthe select— ed innuencing factors consist of the reinforced length，reinforced depth andthe number of reinforced layerS．Theresults show that the geogrid can reduce the foundation senlementandimprove tlle bearing capacity．It can restrict the ground horizontal and vertical displacement efkctiVely．The optimal pammeters of reinforced lengtII，reinforced depth andreinforced layers are 3曰、0．25曰and2 1ayers respectiVely．

Abstract: The compatibility of mechanical properties betweencement and asphalt mortar and repair materials wasstudied by the fbur point bending method．With the help of finite element model，the eH．ect of difkrence in modulus of substrate mortar and repair mortar on the stress and strain distribution of composite sample was studied．Resultsindicated that difference in modulusof substrate monarandrepair mortardecided the loading transfer efficiency and failure mode，which mainly innuenced compatibility of mechanical properties．Accord．ing to the serVice state of CAM，fourpoint bending fatigue test wasemployed to identify the compatibility be．tweenCAMand repair mate“a1．

Abstract: To assess the 10adingquality of bridges，it is necessary to establish FEM，static loadingexperiment wasdesigned．Stress andstrain parameters such as themaximum horizontal thmst of arch feet(condition 1)，the boom axial force(condition2)，the b唔gest negatiVe momentof arch feet(condition3)，themos卜positiVe bending moment of the main arch ring (condition 4) and longitudinal beam (condition 5) under diff色rent working conditionswere calculated by ANSYS；Modal and dynamicdenection were calculated by Midas．As an example，in the 16thacross，the surveyed vibrationf}equency of the bridge is 12％at aVerage higher than theoretical calculationone，namely the dynamicloading stiffness can’tmeet the design requirements．However，the reinforcementandthe maintenancemustbe put forwardinto．Threekinds ofmethodswerecompared at constmction dimculty，emciency．This mean can be used in similarlong-span bridges both home and abroad for testing and repai“ng reinforcement．

Abstract: To pre-stressed concrete beams,it is very important to forecast long-term deflection accurately tofigure out numerical relationship between creep coefficient and creep deflection coefficient.By analyzing creepdeformation of pre-stressed concrete beams under long-term loaded in ANSYS software,and studying numericalrelationship between creep coefficient and creep deflection coefficient while creep coefficient also PPR ofbeams are different,or beam creep coefficient is same but different PPR.Then the results show that full-pres-tressed conerete beams creep deflection coefficient is greater than creep coefficient,while the opposite is truefor partial-prestressed beams. Moreover,this conclusion was further proven by analytical method to creepstrain geometry model. This result may be useful for establishing accurate long-term deflection calculationmodel of pre-stressed concrete beams.

Abstract: Optimization studies on wind-sensitive structures focus on high-rise buildings,and large span spa-tial structures have seldom been involved. For optimization problems with a lot of design variables,the criteriamethod is usually effective. Design theory and numerical program of wind resistant optimization for complexspatial truss structures are firstly presented.Then,a real double-layer cylindrical reticulated shell is optimizedbased on the equivalent static wind loads from wind tunnel tests,discussing the influences of area lower limitand full stress step.The results show that the total structural weight is decreased by 48% when the maximumstress is less than the initial correspondent. By setting area lower limit,suitable area distribution is obtained,and material performance is fully made use of to achieve less structural weight.

Abstract: A smoothed finite element method is applied to buckling analysis of plate,by using the first-orderReissner - Mindlin plate theory ( FSDT). The bending stiffness matrix and geometrical stiffness matrix for el-ement used strain smoothing technicque is calculated by a boundary integral along the boundaries of the smoot-hing cells in element. The mixed interpolation method is employed to calculate shear strains in order to avoidshear locking. Buckling loads of plates subject to uniformly uniaxial,biaxial compression and pure shear in-plane are studied using the smoothed plate element respectively. Numerical examples show that the smoothedplate element is free of shear locking and achieves the high accuracy,compared with mixed interpolation plateelement MITTC4.And the most significant property is their insensitivity to mesh distortion sg that the restrictionon the shape of classical isoparametric elements can be removed.

Abstract: In this paper, the characteristics of an infinitely wide journal bearing are investigated theoretically.In the bearing the laminar flow and turbulence,so-called coexistence state,are assumed to be existed simulta-neously in the oil film. And the thermal effect of lubrication oil is also considered. Under previous assump-tions,the coupling governing equations of bearing such as Reynolds equation,energy equation and tempera-ture-viscosity equation are solved together. Then we obtain the solutions of pressure,temperature,viscosity ,friction and carrying-capacity fields. After we compared these solutions with those under the pure laminar flowstate,some meaningful conclusions are given as follows. If adiabatic condition is satisfied in the bearing,com-pared to pure laminar flow state,bigger load-carrying capacity and friction, larger changing of oil viscosity andhigher temperature will be found under coexistence state.Meanwhile,the load-carrying capacity of bearingsignificantly decreases when thermal effect is taken into account.

Abstract: In order to improve the dynamic stability of power grid and restrain low frequency oscillations effec-tively,research on optimization and improvements of the algorithm is developed for power system stabilizer. Inthis paper,all PSS parameters are conducted as an optimization problem,the best PSS parameters are figuredout by artificial fish-swarm algorithm.Maximizing the minimum damping ratio of all electromechanical mode ischosen for the optimal objective function. PSS parameters are chosen for optimal variable,design of PSS pa-rameters based on the equivalence method of K matrix is used as the benchmark for initial population selectionof artificial fish-swarm algorithm. Good damping can be got for all electromechanical modes of the multima-chine system when using this method,compared with the conventional PSS configuration method.Calculatedresults are consistent with the expected results basically,which shows that the designed optimal algorithm is ef-fective.

Abstract: According to the track geometry data collected by track recording vehicles from Wuhan-Guangzhouhigh-speed railway,the characteristic of track irregularity is analyzed. Firstly,power spectral density is calcu-lated with Matlab program,and compared with European high-speed spectra of high irregularity and low irregu-larity.The statistic and analysis result indicates that the track irregularity spectrum values of Wuhan-Guang-zhou high-speed railway are close to European high-speed spectra of low irregularity except for some wave-length bands of track alignment irregularity spectrum values;this indicates that the track status of Wuhan-Guangzhou high-speed railway is better. Furthermore,the coherence functions are utilized to analyze the rela-tionship between track irregularities and vertical/lateral car body vibration accelerations. The range of detri-mental track irregularity wavelengths is larger than the common railroad.Finally,Hilbert marginal spectrum oftrack irregularity is calculated. The result shows that there are medium wave and long wave track irregularity inWuhan-Guangzhou high-speed railway.

Abstract: This paper introduces the working principle of an Unmanned Aerial Vehicle ( UAV ) pneumaticlaunch system,which takes an air tank as power supply and a pulley block as growth mechanism. The mathe-matical model of the system is deduced by using the bond graph method. And the simulation model is estab-lished by using MATLAB. Through adjusting the design parameters of the system,the influence of these pa-rameters on the launch performance is obtained. The launch performance can be optimized by reasonable matc-hing of these parameters，which provides the theoretical guidance for this system.

Abstract: In this paper,a differential evolution algorithm based on hybrid strategy was proposed to solve thetraditional differential evolution algorithm which is easy to convergence and premature in solving high-dimen-sional problems. This algorithm divided the population into three sub-populations of different sizes and differ-ent functions according to the fitness, standard deviation of fitness and distance of particles.Each sub-popula-tion used different strategies and parameters to achieve their specific functions. It not only enhances the globalsearch ability of the population,but also increases the precision of convergence during the search process.Having tasted four classic benchmarks problems,the experiment results show that the proposed algorithm is aneffective method for different optimization problems.

Abstract: A robust video watermarking algorithm in H.264 compressed-domain is proposed based on the newcharacteristics of H.264 coding standard. The 4 x4 blocks which have more nonzero quantized coefficients in4 macroblocks are chosen as embedding locations based on their texture complexity.To overcome the short-coming of the bit-rate increase in the existing algorithm,probability matrix is determined according to distribu-tion characteristics of DCT coefficients under the different intrapredicted models. The watermark is embeddedinto the quantized DCT coefficients of the luma components in I frames by changing the odevity of the numberof the nonzero quantized coefficients. The simulation results show that the proposed algorithm has little impacton the bit-rate of video, good invisibility and robustness. It can also increase watermarking embedding capaci-ty and meet the requirements of real-time blind detection.

Abstract: In order to improve the dynamic stability of power grid and restrain low frequency oscillations effec-tively,research on optimization and improvements of the algorithm is developed for power system stabilizer. Inthis paper, all PSS parameters are conducted as an optimization problem,the best PSS parameters are figuredout by artificial fish-swarm algorithm.Maximizing the minimum damping ratio of all electromechanical mode ischosen for the optimal objective function. PSS parameters are chosen for optimal variable,design of PSsS pa-rameters based on the equivalence method of K matrix is used as the benchmark for initial population selectionof artificial fish-swarm algorithm. Good damping can be got for all electromechanical modes of the multima-chine system when using this method,compared with the conventional PSS configuration method. Calculatedresults are consistent with the expected results basically,which shows that the designed optimal algorithm is ef-fective.

Abstract: Suitable path planning is a precondition of the autonomous robot exploration in outdoor unknowncomplex environments. The conventional path planning methods focus particularly on planning an un - colli-ding path from the start position to the goal position.Robot attitude stability and its dynamics are seldom con-sidered. A new path planning approach considering the robot ’s attitude stability and energy consumed in out-door complex environment is proposed,which consists of three steps: ( 1 ) gradient calculation,the gradientsof the rough terrain are calculated;(2) nodes detection,the terrain is divided into flat regions and rough re-gions according to a height threshold;(3 ) path evaluation，the optimal path from current position to goal viaintermediate nodes is planned based on the cost evaluation function. Furthermore,robot dynamic characteris-tics are analyzed through back - stepping control, suitable control law is proposed which ensures the stable mo-tion of robot. Compared with the conventional approach,the effectiveness of the proposed method is demon-strated through simulations.

Abstract: In view of to the conventional problem that when motor is running at low speed rotor position detec-tion is inaccurate,the method of high frequency signal injection was studied to deal with a new sensorless con-trol technology to detect the rotor speed and position information. High frequency signal injection method inpermanent magnet synchronous motor sensorless control theory was discussed in detail，the filter and hetero-dyne link were designed , and the rotor observer was built to acquire the information of rotor speed and posi-tion ， a simulation of low speed was focused on. The simulation results show that sensorless control technologybased on high frequency signal method is applicable to low speed,and accurately detect the rotor speed andposition information.

Abstract: This paper primarily investigates the adaptive synchronization of a class of time-delay chaotic sys-tems with uncertainties. According to Lyapunov-Krasovskii functional and the Lyapunov stability theory,thecontroller and adaptive law are designed. The control strategy does not contain time-delay terms,which can beapplied to time-delay or multiple time-delay chaotic system,whoes time-delay is known or unknown.The ap-proach is more robust to noise and external interference,and does not need to known the upper bound of un-certainties in advance. In addition,it can adjust the system response rapidly by adjusting the accelerated fac-tor. Numerical simulations verify the effectiveness of the proposed method.

Abstract: The different speed reducer structure of main and auxiliary shaft drive in DC - 32 tamper machineleads to difficulty to adjust the movement synchronization and the problem of different traction. In view of theproblem analyzing the hydraulic driving system of DC - 32 tamper machine,building the simulation model u-sing AMESim software. The analysis of the results of simulation brings forwards a new driving scheme,thensimulating and studying the scheme. The results show that the new drive scheme contents the working require-ments.

Abstract: The device uses touch screen as man-machine interface,MCU PC16F877 as the control unit to re-alize real-time data acquisition of wind pressure and hydraulic pressure of brake hose,the detection process ofthe automatic control and test results of the storage,query and print functions.Through the developing the de-tection device,the degree of brake hose test process automation and the accuracy of the test results is im-proved,the labor intensity of the maintenance personnel is reduced,the safeguard for safety. has been provid-ed. This paper introduces the design scheme of the microcomputer control brake hose testing device.

Abstract: If a generalized Feistel network cipher adopts the multi-SP round function,the security is alwaysdifferent to the single-SP case. We studied this change where the multi-SP round function has a non-perfctdiffusion. We analyzed the structure and the round function of the inner permutation of Lesamnta-256 for theirdifferential properties. This is the first application of the super-match technique to a generalized Feistel algo-rithm.

Abstract: In this paper,we propose two application models:the dual-core chip card with dual interface andthe single-core card with dual interface. These models are based on the specifications of the Residents HealthCard.Through the transformation of the card Operating System COs( Chip Operating System ),the capacitanceof the third-party residential health card is created. We can get the SM2 ( It is the asymmetric algorithms thatis specified by the State Encryption Administration )signature public-private key pair in the chip and import itinto the container. The dual digital certificate ( encryption certificate and signature certificate) can be impor-ted outside the chip . And the SM2 key pair,encryption key pair can be imported too.These models are com-patible with the standards of medical industry,financial industry and electronic certification industry.Re-search result of this paper lays a good foundation for the legalization of residential health card holder’s identityin internet.

Abstract: The process of ethyl levulinate produced by cellulose in ethanol medium was investigated. Effects ofprocess variables including ratio of solid to liquid,acid concentration, reaction temperature,reaction time andthe addition of water on the yield of ethyl levulinate were studied,The results indicated that higher yield ofethyl levulinate 42.68 mol% was obtained, when the reaction time was 30 min,reaction temperature was 190℃,the ratio of solid to liquid was 1: 15 and the acid concentration was 1.0 wt%,respectively.In addition,the yield of ethyl levulinate decreased significantly with the increase of water addition, and the stability of ethyllevulinate also decreased with the increase of reaction time. Moreover, the original cellulose and the residue ofcellulose were characterized using scanning electron microscopy ( SEM),X-ray diffraction ( XRD) and Fou-rier-transform mid-infrared spectrometry ( FF-IR). The results showed that the structure of original cellulosehad been destroyed absolutely and the crystallinity of cellulose was decreased seriously.

Abstract: This paper studies the effect of As ( Ⅲ ) on the activated sludge in the sequencing batch reactorsystem. Rl and R2 ( control CK) were installed for contrast test. As( Ⅲ ) was increasingly added in R1 andthe activated sludge character and effluent quality were termly tested. The results showed that COD removalrate of Rl maintained at ca.90% which is 5% lower than that of R2. With stepwise augmentation of As(III), the flocs became disperse and tiny , SV130 increased from 37 mL/ g to 97 mL /g , which was proba-bly due to the decomposed structure of flocs caused by partial microorganisms poisoning.Compared with R2,the microbiological diversity was relatively simple,especially the protozoa disappeared under the high concen-tration of As().

Abstract: Thermal efficiency, as an important indicator to measure the heating furnace advanced and the op-eration,is directly related to a level of energy consumption of the workshop production.Based on a combustionstatus of the wax oil hydrogenation unit heating furnace for Luoyang petrochemical company,some factors ofinfluence on the thermal efficiency of heating furnace were analyzed,and some improvement measures wereput forward to achieve the goal of energy saving.Furnace thermal efficiency is mainly affected by the excess airratio,exhaust gas temperature,carbon monoxide content of factors. the results show that the excess air coefi-cient increased about 6.3%,thermal efficiency reduced about 0.4% when the oxygen content is increased by1 %;amount of carbon monoxide is increased by 100 mg/L,thermal efficiency is reduced by about 0.05% ;and the exhaust gas temperature is increased by 5 ℃,the thermal efficiency of about 0.25% is lower. In or-der to improve the efficiency of the heating furnace,it is necessary that oxygen content is with in 2% ~4%, exhaust temperature is with in 125 ~135 ℃ and as low as possible for the content of carbon monoxide.

Abstract: The optimum technological condition by the Cellulase Enzymatic Extraction Technology of the poly-phenols from Leptopus Chinensis ( Bunge) Pojark is studied. Through the Orthogonal design,we analysed theeffect of ethanol concentration,ratio of material to liquid,to the polyphenols from Leptopus Chinensis ( Bunge)Pojark.The experiment result shows that compared with ultrasonic wave extraction technology on polyphenolsfrom Leptopus Chinensis ( Bunge ) Pojark,this method has a greater extraction rate (4.24mg/g). The extrac-ting technology shows higher extraction rate of polyphenols,good stability,green,no pollution,and is availa-ble for industrial production.

Abstract: The hydroisomerization of n-dodecane was studied in this paper.Pt/zeolite catalysts,which respec-tively used monodimensional pore molecular seives,ZSM-22,L and SAPO-11 as support,were prepared byimpregnation method and characterized by XRD and NH3 -TPD.The influences of their acidity on hydroisomer-ization were investigated as well. The results showed that the total acid amount of the supports affect the activi-ty of the catalysts,a higher total amount of acid in the catalyst having a higher activity. The selectivity ofhydroisomerization is related to the acid strength,strong acidic centers make reaction toward the cleavage di-rection,reducing the i-dodecane selectivity; the weak acid sites conducive to the hydroisomerization of n-do-decane,and the number of weak acid sites correlated well with i-dodecane selectivity in hydroisomerization.When weak acid sites is the largest proportion in the total acid amount,the hetcrogeneous product selectivitywill be higher. This study will provide a better idea to enhance and improve catalyst acidic,which is used inthe the hydroisomerization of macromolecular paraffin.

Abstract: Thermal efficiency,as an important indicator to measure the heating furnace advanced and the op-eration, is directly related to a level of energy consumption of the workshop production.Based on a combustionstatus of the wax oil hydrogenation unit heating furnace for Luoyang petrochemical company,some factors ofinfluence on the thermal efficiency of heating furnace were analyzed,and some improvement measures wereput forward to achieve the goal of energy saving. Furnace thermal efficieney is mainly affected by the excess airratio,exhaust gas temperature,carbon monoxide content of factors. the results show that the excess air coeff-cient increased about 6.3%, thermal efficiency reduced about 0.4% when the oxygen content is increased by1 % ; amount of carbon monoxide is increased by 100 mg/L,thermal efficiency is reduced by about 0.05% ;and the exhaust gas temperature is increased by 5 ℃,the thermal efficiency of about 0.25% is lower. In or-der to improve the efficiency of the heating furnace,it is necessary that oxygen content is with in 2% ~4%, exhaust temperature is with in 125 ~ 135 ℃ and as low as possible for the content of carbon monoxide.