Abstract:

Abstract: 500 MPa level hot rolled steel bar of ultra-fine grains( HRBF500 steel bar) is successfully developednew-type steel of high -speed railways in Chinese metallurgical industry. HRBF500 steel bars will be used inhigh-speed reinforced, so it will be exposed to repeated loads. In view of that, the fatigue life predictions ofRC beams reinforced with HRBF$00’S are urgent to be solved. Based on ANSYS software, the fatigus life predictions of rectangular and T-section RC beams reinforced with HRBF500 were sudied and compared well withthe test results, which indicated that steel ratio , minimum fatigue load and load amplitude were the main fac.tors affecting the fatiue life. In order to promote prediction method for practcal engineering design, the simpli-fied fatigud life formulas were obtained based on comprehensive analysis of finite element calculation results.Those formulas can provide guidance for practical engineering design.

Abstract: For evaluating the shear property of stress absorbing layer asphalt mixture, compression reboundmodulus test under different temperatures and numerical analysis were conducted, The inlluence of test conditions such as specimen size and head size and mineral aggregate gradation were discussed, And then the feasibility and appropriate test conditions of penetration test were proposed based on the numerical analysis and testresults. "The results show that: with 100mm diameter and 100mm height static pressure cylindrical specimensand 19mm diameter pressure head, the test data is stable and can effectively distinguish mineral aggregate gra.dation of stress absorbing layer, Conclusion provides theoretical and test basis for quality control of stress ab.sorbing layer asphalt mixture.

Abstract: In view of the risk analysis’s dependance on expert’s judgment on unascertained information, anew method named unascertained-analylic network process was proposed combining unascertained measurecomprehensive evaluation model with analytie nelwork process. The basic theory was introduced in particulaand the method was then applied to an earth-rock dam’s risk analysis, The result is congistent with that analyzed with fuzzy analytic hierarehy process, which indicates that the proposed method is feasible and reasona.ble

Abstract: The test research on the adhesion sproperties of bonding mortar modified three types of polymer la-tex powder in XPS plate used for the outer insulation system of external wall was made. The results showedthat the admixing content of pure acrylie copolymer latex powder and Wake 5044N latex powder and latex pow-der made in China ( belonging to EVA) respectively was or surpassed 19% and 29% and 31% ( based on mor.tar mass ) . The conelusion was that pure acrylic copolymer latex powder would be excellent polymer latex pow.der in XPS plate used for the outer insulation system of external wall.

Abstract: Building integrated photovollaic systems have attracted great interests and attention form the devel.oped countries, which are important manners of regenerated energy utilization, energy saving and emission re.duction, Design and practice of a building integrated photovoltaic system that is oriented towards ecological en-vironment are studied and analyzed, Basing on the characteristics and features of buildings and local climatecondition, design and assemblage of system are carried out combining pholovoltaic power system with buildingroof garden. It is shown in running that the design achieves ecological transition, building integrated phalavoltaic mode , rainwater collection and utilization, and notable energy saving. The system makes necessary faundation and important reference for the large seale application of building integrated photovoltaic system in middle China.

Abstract: The design of a new type of remote monitoring system based on GPRS, ZigBee networks can im.prove the real-time monitoring of distributed multi-point in the remote monitoring system, reduce the cost of re.mote monitoring, extend the monitoring distance, adapt to varieties of complex environments and save humanresources, The real-time performance status of various points is detected by the collection terminal the performance through the ZigBee network, and is sent to the data transfer center that will send the data to a remoteWEB server through the GPRS module, The system can be used for the vibration detection of large equipments. Experiments show that the system can implement real-time monitoring of each detect point on any loca.tion , the distance fom the data transfer center less than 100m.:, with the GSM signal provided by WEB serverCompared with the traditional systet, what the WEB server should do to complete remote monitoring is toplace a mini-collection terminal and data transfer center in each test point.

Abstract: The Hansbo’s formula for non-Darcy flow :. introduced to modify Terzaghi’s 1-D consolidation e.quation, and the modified equation is generalized to account for the consolidation case under time-dependentconstruction loadings. The dependent variable of the presented nonlinear consolidation equation is the effectivestress, and numerical analysis is performed by using the finite volume method. "Then the effects of the parame.ters of Hansbo flow and the rate of loading on the 1-D consolidation behaviors of saturated clay layers are in.vestigated. The numerical results indicate that Hansbo flow causes the more accumulation of the pore waterpressure in the construction period and delays its dissipation after construction, and the rate of setlement ofthe soil layer deereases with the inerease of the parameters of Hansbo flow, In addition, the influence of load.ing rate on the consolidation behaviors is remarkable in the construction period and at the initial stage after itseompletion of construiction.

Abstract: The 2nd Yellow River bridge in Kaifeng is a double plane prestressed concrele cable-slayed bridgewith 7 low pylons and 8 spans. "The bridge was taken as the object of study and mechanics properties analysisof it had been made by adopting finite element program Midas/eivil. The results indicate that stay cables un.dertake more vertical loads because of the bigger ratio between height of king pylons and spans of girder, sothe height and internal force of the girder sections at supporting points can be decreased effectively; the inter.nal forces and deformations of the girder display an characteristic as well as multi-span continuous beams, thewhole sections of girder are all under compressive stress basieally, axis force distribulion is uniform , the posi.tive bending moment appears at the supporting points of girder and it is larger than the hogging moment at themid-spans; the stiffness of girder is large, because the deformation of girder gives priority to the smaller upwards vertical deformation ; the king pylons only serve as a steering column for stay cables and foree in longitudinal direction is smaller, the displacements at the top of pylons in the longitudinal direction of bridge is sosmall that in scale of medium spans, the scheme of low pylons cahle-stayed bridge can sovle the problem olstiflmess of multi-span cable-stayed bridge; The tension forces of cables at both sides of each pylon increasegradually from inside to outside, the force of cables of side-span is largest, and the growth of cables stress un.der live loads is very small; the bridge under asymmetric loads is disadvantageous, the stress and deformationof control section of each members are all in the range of the standard of criterion and have great safety stor.age,the structure of bridge is reasonable under loadg.

Abstract: The torsional vibration of soil is solved by separation variable method by considering interaction be.tween pipe pile and soil under axisymmetric condition, and the torsional vibration of pipe pile in soil is investi-.gated with the orthogonality of trigonometric functions by considering the boundary conditions of soil and pipepile, and the influenee of related parameters on the coupling torsional vibration of pipe pile, The research in.dieate that the resonance phenomenon is existed, and the radius ration between inside and outside of pipe pileand modulus ratio between and pile around soil have great effect on the complex stiffness of pipe pile at head.but the influenee of modulus ratio and density ratio between inner soil and pile around soil is very little at lowerfrequency, but the influence is larger at higher frequency.

Abstract: A genetic algorithm based control design is proposed to control wind-induced vibration of long-spanroof in this study, An active tuned mass damper ( A’TMD ) controller is designed using the proposed methodolo-gy. Wind-induced control theory is presented firstly, The root mean square of displacement and aecelerationresponses are used as the evaluation criteria of control eliciency. Then procedures for control of wind-inducedvibration of long-span roofs based on genetic algorithms are given, Finally the method is applied to the controlof wind-induced responses of a long-span roof, The root mean square of displacement and acceleration respon.ses is caleulated for some typical measuring points, And the results are compared with those obtained from oth.er controller, The overall results of GA-based controller are accurate and efficient, The root mean square val.ues of displacement and acceleration of the sample points are reduced by 53.8% and 44.6% on average, re.spectively. GA-based controller reduces peak vertical displacement and acceleration of all sample points by65.7% and 56, 296 on average, respectively. GA-based control design methodology can obviously reducewind-induced vibration of long-span roofs, As an accurate and effective tool in wind-induced vibration control.the proposed method can provides some references for praetical projects.

Abstract: Binary skutterudite compound CoSb3 was prepared with high-pressure method. Single CoSb3 phasecould be obtained rapidly( ~ 20 minute) with high pressure method, X-ray difraction. The measurement ofSEM shows that high pressure synthetic sample is polycrystal CoSb3 with fine grain size. With the increasing ofsynthetic pressure, the electrical conductivity of CoSb3 decreases while the Seebeck coeffcient increases.

Abstract: A genetic algorithm based control design is proposed to control wind-induced vibration of long-spanroof in this study, An active tuned mass damper ( A’TMD) controller is designed using the proposed methodolo.gy. Wind-induced control theory is presented firstly, The root mean square of displacement and accelerationresponses are used as the evaluation criteria of control elcieney, Then procedures for control of wind-inducedvibration of long-span roofs based on genetic algorithms are given, Finally the method is applied to the controlof wind-induced responses of a long-span roof. The root mean square of displacement and acceleration responses is caleulated for some typical measuring points, And the results are compared with those obtained from other conlroller, The overall results of GA-based coniroller are accurate and efficient. The root mean square val.ues of displacement and acceleration of the sample points are reduced by 53,8% and 44.6% on average, respectively, GA-based controller reduces peak vertical displacement and acceleration of all sample points by65.7% and 56. 2%6 on average, respectively, GA-based control design methodology can obviously reducewind-induced vibration of long-span roofs, As an accurate and effective tool in wind-induced vibration control,the proposed method can provides some references for practical projects.

Abstract: Micro/meso-porous composite molecular sieve l/MCM4l was synthesized with embedding methodand ion exchange using cetyl trimethyl ammonium bromide ( CTAB) as template and it was confirmed by heingcharacterized by X-ray diflraction( XRD), seanning electron microscopy( SEM), transmission electronic mi.croscopy(TEM) and N, absorption/ desorption. The results indicated that the pore diameter of L/MCM-41composite molecular sieve was 3. 04 nm which was bigger than that of microporous molecular sieves. Comparedwith MCM -41 molecular sieve synthesized by ordinary hydrothermal method: 1 )the pore wall thickness in-creased from 0. $5 nm to 1.81 nm ; 2 ) The hydrothermal stability improved signifcantly, the structure couldkeep unchanged for &h, rising by 6 h, at 100 ℃, Compared with zeolite L,the content of K* decreased from18.42% 0.98%.

Abstract: In view of the properties of a lowpass filter of the thermal objects,the low-order approximate formulafor the single-phase heated tubes, called super-heater tubes, is carried out by using the Taylor series. Accord.ing to the physical properties and dynamic behavior of superheated steam , the improved formula and its appli-.cation method are proposed, which are suitable for dynamic characteristic analysis and real-time simulation indifferent conditions. ’The method has the advantagea of simplification, convenience and practicability, so it canbe used lo improve performance of sleam temperature control in power plant.

Abstract: The terary system symmetrical C4 disulfide + acetone + water in the process for the synthesis olsymmetrical C4 disulfide is a relatively new system, The data of liquid-liquid equilibrium (tie-lines and solu-bility ) for the ternary system symmetrical C4 disulfide + acetone + water were determined at almospherie pres.sure and at 308. 15 K, using cloud point method and halance reactor method. ( Symmetry C4 disulfide inclu.ding n-butyl disulfide, sec-butyl disulfide and tert-butyl disulfide). The composition of the conjugate phase ofthe ternary liquid phase equilibrium system was determined and the equilibrium curve was drawn finally. Theinner-sealing method was used to determine the concentration of symmetrical C4 disulfide and acetone in thisternary system. Experiments in single-phase region was verified, and the accuracy of experimental error is1.569 rms. Study on the phase equilibrium of the terary system symmetric C4 disulfde + acetone + watershows it is very favorable for the recovery of symmetrical C4 disulfide. The study is essential for clean synthesisof symmetrical C4 disulfdes to design and control.

Abstract: The optimum technological condition by the ultrasonic wave extraction technology of the polyphenolsfrom Leptopus chinensis ( Bunge) Pojark is studied, Through the orthogonal design, we analyse the effect ofethanol concentration, ultrasonic power, ultrasonic temperature , ratio of material to liquid, extraction time onthe polyphenols from Leptopus chinensis ( Bunge) Pojark, The experiment result shows that the optimum ex.tracting condition is ethanol concentration 6096 ,ultrasonic wave power 135 W,ratio of material to liquid 1 :25extraction temperature 70 ℃, , extraction time 70 min. The extracting technology shows higher extraction rate ofpolyphenols, good stability and is feasible for industrial production.

Abstract: Sutchuenoside A, one of the flavonol glyeosides, was studied using the NMR data analysis methodand was detected through 1D (1H,13C NMR and DEPT) and 2D NMR (1H-1H COSY,HSQC, and HMBC)techniques. The results show that the ’H and ’"’C NMR spectra are completely analyzed and assigned, and thestructures of sutchuenoside A are further identified. This research provided not only NMR data analysis meth.ods and evidences, but also structures information for the structures identification of flavonol glycosides.

Abstract: The composting experiment was conducted using spent mushroom dreg and cow dung. lts object wasto investigate the elfect of the different raw material proportions and two kinds of amendment of matured com.post and composite cellulose-degrading microbe on nitrogen trangformation during spent mushroom dreg com-posting. The samples were taken for the determination of the nitrogen morphology in the different compostingstages. The results showed that the NH,-N content in all samples inereased in the primary period, then de.creased in the decomposed period of composting. While the content of NO,-N had the opposite trend with theNH,-N content. At the end of composting, the NH,-N content declined significantly with spent mushroom dreginereasing, but the NO,-N content increased obviously with spent mushroom dreg inereasing. Both organic ni-trogen and total nitrogen decreased significantly with spent mushroom dreg increasing. The organic nitrogen in-creased by 35%6 and 47%6 , respectively , in the treatments with matured compost and composite cellulose-de-grading microbe. Meanwhile, the total nitrogen increased by 28%6 and 41% , respectively. These results dem.onstrated that the inoculation of microbe would be beneficial to the formation of the organic nirogen in themushroom dreg composting.

Abstract: The facultative biodegradation performance of reactive dyestulis is studied by using different concentralions glucose as co-substrate. Based on this , the facultative biodegradation performance of K-2BP under dif.ferent salt-containing condition was investigated by static test reactor. The results indicated that facultative mi.croorganisms had lower degradation rate when only K-2BP was used as the substrate, and the degradation ratewould be increased under the existence of the glucose. The glucose concentration is 800 mg/l, while the degradation rate of K-2BP is 64. 19% at 6h. However, it is detrimental to dye’s biodegradation when the glucogeconcentration is up to 1000 mg/l, the degradation rate is only about 46% , that is similar to the conditionwithout glucose. On the premise of glucose concentration 800 mg/L, when the salt concentrations are 2 g/L.5 g/L ,10 g/L. and 20 g/L. respectively,the first-order kinetics constants are 0. 10578 mg/L · h 0.04947 mgL .h 0.02869 mg/L . h and 0.022 75 mg/l. . h respectively. And the halflives were 6.99 h、14.15 h、22.55 h and 30, 21h reepectively, The reaetion rate constants decrease gradually with the increase of the salt coneentrations ,and when the salt concentration is more than 2g/l., it can restrain the facultative microorganismsdegradation of K-2BP will be restrained.

Abstract: In order to evaluate the removal elliciency of soil ecological system lor contaminants ,concentrati0n5of COD., TN, ’TP and $S which were from inflow and efluent were monitored continuously in diferent sea-sons, respectively. The results showed that the operation situation was affected hardly by temperature changebecause of the under-ground design of the system, and the water quality of efluent content with the " urbansewage treatment plant pollutant discharge standard (GB18918 -2002 )" when the concentration of inflow waslimited within a certain range, The operation process also showed that the technology had characteristies of lessenergy consumption, less wastes discharge, and landscape harmony, Soil ecological wastewater treatment tech.nology has opened up a new approach for the dispersive sewage management of tourist resorts, remote villagesand other areas.

Abstract: The connection interface stregses of pin joint composed of a cylinder pin and homogeneous orthotro.pic laminate are calculated and analyzed with finite element method when the pin is pulled from the laminatehole. The model is caleulated by two steps : firstly ,ealeulating pre-stresses caused by assembly interference ofpin and plate without external loads; secondly, calculating stresses when pulling pin from the laminate resultedfrom applying displacement load. The final results show that stresses are concentrated near the pin and holeedge and display symmetrical distribution. Stresses in the radial and tangential directions change much and themaximum happens on the laminate hole edge, while stregses in the axial direction of hole centre change littleand the maximum exists on pin surface, These can offer reference for predicting regions where damages mostpossibly occur and lay the foundation for analyzing failures of orthotropic laminate.

Abstract: Traditional plane retractable mechanisms of landing gear are restricted by supereritical airfoils, butspatial mechanisms can meet the requirements of space limit and distribute loads of landing gear among morepoints of the airplane. $everal spatial mechanisms are discussed in this paper using CATlA software; a rela.tively simple six-bar spatial mechanism is introduced, Digital mockup of retractable landing gear based on thesix-bar spatial mechanism is built, and the landing gear mechanism kinematic simulation is conducted. Motionparameters of the key points, the center point of the support strut lower surface and the joint center point oflower and upper arm braces, are measured, and velocity curves of the two points are given.

Abstract: In view of the defects of inflexible layout for the sensors, complicated wiring and low efficieney ofmonitoring and so on in nowadays existing monitoring systems for pump truck, a monitoring system adoptingCAN bus and ZigBee technology has been designed in the LabVlEW developing environment to monitor therunning status of pump truck in real-time monitoring, prompt fault alarming, automatically recording and ana-lyzing of history data, enabling standardization and plug and play of CAN bus in data acquisition and transmis.sion module. The experimental results show that the system processes stability, high transmission rate and flex-ible extension, and the operation safety and service life span of concrete pump have been improved.

Abstract: Based on the ADAMS ( Automatic Dynamic Analysis of Mechanical Systems) simulation softwareplatform, with the 3-RRR’T parallel mechanism as the research object and the Coulomb’s frietion into consid.eration, the contact force model of joint with clearance is established by using the nonlinear equivalent springdamp model. After simulating the model, comparing the dynamic characteristic of parallel mechanism which u.ses ideal joint use clearance joint, simultaneously comparing the dynamic characteristics of parallel mechanismwith clearance in one chain with that in three chains, we have the result that shows that the clearance affectsthe acceleration of moving, platform and mechanism’ contact force, so clearance should be considered whendesigning the mechanism.

Abstract: In order to improve relatively severe weakness of automobile braking controlling due to insufficientmechanical inertia, a new method of brake test drive current controlling is proposed, using drive current con-trol to add the deviation caused by simulation system compensation compared with the real system, the spced.angular velocity of simulation system is approximate to values of real system , energy error is regarded as an e.valuating indicator. It showed that in MATLAB simulation experiments, the control method has less error,simple algorithm, and good disturbance and great robustness, it can shorten braking distanee and the effect ofcontrolling is more ideal.

Abstract: The transient zero-sequence characteristics in the case of single phase-to-ground fault in small cur.rent neutral grounding system are analyzed in this paper. And the fault line selection criterion based on thedifference of transient current changing rate between the fault line and the non-fault line is given, Then thetransient zero-sequence current changing rate method for the fault line detection of small current neutragrounding system is presented. The method, which can be immune to the variation of neutral grounding, voltage initial angle and transition resistance, has the characteristics of high sensitivity, reliability and practicali.ty. Finally , the simulation model of smal!l current neutral grounding system is built with Matlab and the simu-lation results showed the effectiveness of the method.

Abstract: In this. paper, we explored an approach for recognizing human cmotional state from fused 2D-FrF’Tfealures based on Canonical Correlation Analysis ( CCA). This approach is mainly based on the correlation be-tween different orders in 2D-FrF’T. First, the visual features are extracted by 2D-FrFT, and two orders arechoser which achieve the highest recognition rate for feature fusion through CCA, Then we send the fused fea.tures into the multi-classifier based on SVM. The feasibility of the recognition approach we proposed has beentested and the experimental results sufficiently demonstrate the effectiveness of the proposed approach.

Abstract: In this paper, on the basis of the W78E58 and XCS10, combining the TMP82C79 keying modeland the 1.G12864 liquid crystal display model, the system of high-precision multi-function time ealibrator isdesigned and implemented, and it adopts the high-precision quartz crystal ae frequency standard, and the dateand time provided by GpS as time standard. This system can test multi-rate and the timing reference frequencyand switching period error of the multi-function electricity meter.

Abstract: Watermarking embedded in transformation domain ofen possesses excellent robust performance butsmall embedding information volume, Dual digital watermarkings were embedded in diferent transformationdomains in order to improve the robust performance of the watemarking and embedding information volume. Ahinary watermarking was embedded in the DCT domain by exchanging the DCT coefficient while a gray levelimage was embedded in the DW’T domain with iterative blending technique which is ready to enlarge the vol.ume of watermarking information. It was shown that the algorithm could improve the robust performance whenit was attacked with JPEG compression , cutting and adding some noises and the embedding information volumebeing enlarged.

Abstract: In view of the ID authentication problem of mobile users when roaming, an lD authenticationscheme with anonymity in wireless networks was proposed by means of bilinear pairing, hash functions andsymmetrical eneryption algorithms, From the performance and security, the proposed scheme was analyzed.The analysis showed that the scheme is secure and efficient, which can achieve the anonymous lD authentica.tion to mobile users and can achieve mutual lD authentication between two objects, go the scheme can satisfythe secure reguirements of wireless networks.