Abstract:

Abstract: Based on finite element analysis,considering three working conditions: 1 ) single wheel in the mid-dle of the manhole cover, 2 ) single wheel at the junction of the manhole cover and the road,3 ) single wheelx meters distance from the junction of the manhole cover and the road,it carried out the comparisons and anal-ysis of stress and deformation of the new type self-adjustable lifting manhole cover and the traditional manholecover on asphalt concrete pavement. The result showed that the vertical deformation and the wheel stress of thenew type manhole cover are less than the traditional one in the three working conditions,and the new typemanhole cover can be better compatibly deformed than the traditional manhole cover,reducing the relative de-struction of the manhole cover and the surrounding road.The research results of this paper provides theory ba-sis for the popularization and application of the self-adjustable lifting manhole cover.

Abstract: According to the three-dimensional incompressible Navier-Stokes equations and the standard turbu-lence model, the 100 double-line tunnel cross-section which is generally used in high-speed railway of China isstudied,this paper has made a thorough study on the variation rules and distribution characteristics of trainwind,and has calculated the maximum wind speed at different positions on the two evacuation passageways,atthe same time the influence that train wind on personnel safety is further discussed.The results show that:Train wind is complex three-dimensional flow which is changed with time and space,person should avoid ac-tivities at dangerous time,personnel safety may be threatened by train wind on two train driving conditions:one is that a single train runs through tunnel normally while the other is that another train runs beside a trainparked in the tunnel.Corresponding measures should be taken to avoid accidents.

Abstract: A numerical model of arch culvert was established and the process of installation of the culvert andconstruction of the embankment were simulated. Then the traffic loads were applied on vertical section of theroad,and parametric studies were carried out to investigate the influence of cycle times, traffic loads and vehi-cle speeds on the dynamic responses of arch culvert. The results show that the arch is the most vulnerablecomponent of the whole culvert under traffic loads. After eight times cycle of traffic loads，the settlement ofroad surface and the vertical earth pressure on the top of culvert tends to be stable.The vertical earth pressureat the top of culvert increases as the traffic loads increase.The vertical earth pressures both at the top and bot-tom of culverts are not sensitive to the variations of the vehicle speeds.

Abstract: In order to study the influence of temperature on compaction degree,theory density change rule ofMarshall specimens was studied under different temperatures and compaction times.A mixture temperature lostmodel was established based on heat conduction theory to study asphalt mixture heat losing under low tempera-ture,this model was also verified by observation data. The results show that: asphalt mixture was difficult tobe compact to 98% degree under 100 ℃. As thin as the pavement was, the temperature distributed more scat-tered and the compaction become more hard. Thickness of pavement decreases from 10 cm to 4 cm by 2 cmgrads,the effective rolling time decreases by 9.7% ,25% ,24% .

Abstract: Based on theory of cantilever construction,combined with a three cross continuous rigid framebridge,with finite element analysis software,we select some complex construction phase as the research ob-ject,making calculation of seismic response and seismic performance. The results show that,when earthquakeeffects,rigid-framed girders’stress performance is better than that of continuous beam and the transition see-tion is special; along the rigid-framed girder and transverse to the continuous girder,the seismic performanceis good; development of plastic transverse to the bridge is rapid, development of plastic of the complete bridgestage is rapid. Research suggests that,we need to strengthen the transition force changes of beam section,strengthen seismic design of transverse to rigid-framed bridge and along continuous beam bridge.During con-struction,we need to pay attention to loads of rigid-frame bridge,strengthen the observation of side span clo-sure phase.

Abstract: In order to investigate the effect of the pile ’s diameter,pile body ’s effeetive prestress and configu-ration of a certain number of non prestressed reinforcement on seismic behavior of PHC pile,five PHC pileswere tested under low cyclic loading. The damage characteristic,bearing capacity, hysteretic curve and duc-tility were analyzed. It is shown that the seismic performance of PHC pile was reduced with the increase of thepile’s diameter and with the improvement of pile body’s effective prestress. The configuration of a certainnumber of non prestressed reinforcement can effectively improve the level of the pile ’s seismic performance.

Abstract: In order to analyze the debonding failure of concrete beams strengthened with externally bonded fi-ber-reinforced-polymer ( FRP) plates,this paper adopts the energy-release-rate approach and the J-integralformulation,and proposes an interface damage model and an algorithm for the construction of the equilibriumpath that describes the debonding process in the FRP strengthened beam.The model and the approach of equi-librium path can be used to predict the debonding failure for the interface of FRP-concrete beam through threecases that include a single shear test,an edge peeling test,and a beam specimen strengthened with FRP.

Abstract: The theoretical solution to the distribution of axial force in Mindlin displacement problem and theplastic radius of surrounding rock in the condition of elastoplastic homogeneous soil are deduced.Based on theresults of field test, the mechanical characteristic of systematic bolt and its length optimization are discussed inloess tunnel from the two perspectives of the drawing force and axial force at the location of neural point.Theresults obtained will offer the technical support for the length optimization of systematic bolt in loess tunnel.

Abstract: In view of uncertainty and complexity in the process of bridge landscape assessment,based on setpair analysis ( SPA ) theory,identity - discrepancy - contrary ( IDC) connection degree formula which canembody certainties and uncertainties of the assessment system is introduced and set pair analysis model(SPAM) is established in bridge landscape assessment. The meaning of SPA applied to bridge landscape as-sessment in two levels is fully analyzed. All indexes can be summarized in five - member connection number.Analytic hierarchy process (AHP) is applied to calculate the weighing values in order that the artistic degreeof the bridge can be calculated from the objective and subjective evaluations. As an example,Hulu riverbridge is assessed with SPAM. The results show that ; from the whole system,the artistic degree of the bridgeis fine;from the subsystem,bridge esthetics,modeling and environment coordination are better than others.The results express the artistic degree of the bridge on different levels and different aspects. SPAM combinesqualitative description with quantitative analysis and takes full advantage of uncertainty. It is a new model forthe bridge landscape assessment.

Abstract: In order to reduce interior noise caused by cooling fan,mechanism of beat vibration of double cool-ing fans was discussed with help of theoretical analysis and field test. The comparison tests of prototype werecarried on direct to the double cooling fans with and without optimizations. It was pointed that beat vibrationwas caused by double cooling fans with unbalance mass and little dfference in rotating speed,which affectedthe comfort of the vehicle.The interior noise has close relationship with noise of cooling fan and beat vibrationof noise was obvious.The interior noise of idle with high speed of cooling fans decreased from 48.32dB(A)without optimizations to 46.86 dB( A) with optimizations by adjusting the rotating speed difference of thedouble cooling fans to 20%and cutting unbalance mass by 10% .

Abstract: The absolute stability problem for neutral Lurie control systems with time delays is studied.By di-viding the discrete delay interval into multiple segments and choosing proper Lyapunov -Krasovski functions,two delay-dependent criteria for absolute stability of systems in infinite sector and finite sector were respectivelyderived.The derived stability criteria were both discrete delay dependent and neutral delay dependent. Theproposed condition was in terms of a linear matrix inequality which can be easily solved with Matlab toolbox.Finally，numerical example demonstrates the validity and feasibility of the proposed criteria.

Abstract: In view of the defects of the previous methods about fuzzy risk analysis based on similarity measuresbetween generalized fuzzy numbers, this paper presents a new method for fuzzy risk analysis based on similaritymeasures between generalized fuzzy numbers.Firstly,we present a new method based on similarity measurebetween generalized fuzy numbers.The method comprehensively considered the specifie differences betweentwo generalized fuzzy numbers,including the center of distance,the height and the shape of generalized fuzzynumbers; and at the same time,we also prove some properties of the proposed method; and then we illustratethe superiority of the proposed method by comparing the other methods based on similarity measures betweengeneralized fuzy numbers.Lastly, we summarize the advantages and disadvantages of the proposed algorithm.

Abstract: Since the voltage and reactive power are two key factors of the power quality evaluation,how tocontrol the voltage and reactive power and making it within an acceptable range operation are of great signifi-cance. Voltage and reactive power control based on the traditional nine partitions exists oscillation question inswitch operation,however, the fuzzy control method that the substation voltage and reactive power control canavoid these problems. A substation voltage and reactive power fuzy controller is proposed in the paper accord-ing to fuzzy control strategy,and the MATLAB simulation are made on the fuzzy controller,the analysis resultsprove that the fuzzy controller designed in this paper can reduce the regulation numbers of transformer taps andshunt capacitors,meanwhile increase the service life of the substation equipment.

Abstract: Since the voltage and reactive power are two key factors of the power quality evaluation,how tocontrol the voltage and reactive power and making it within an acceptable range operation are of great signifi-cance. Voltage and reactive power control based on the traditional nine partitions exists oscillation question inswitch operation,however,the fuzzy control method that the substation voltage and reactive power control canavoid these problems. A substation voltage and reactive power fuzzy controller is proposed in the paper accord-ing to fuzzy control strategy,and the MATLAB simulation are made on the fuzzy controller,the analysis resultsprove that the fuzny controller designed in this paper can reduce the regulation numbers of transformer taps andshunt capacitors,meanwhile increase the service life of the substation equipment.

Abstract: Some schemes of cophase power supply used to passive symmetric compensation was presented whichcombined balance transformer negative sequence compensation characteristic. In view of different traction loads,applying negative sequence diagram analysis compensation capacity derived derectly in all port and concludedthe a3 port is the best power supply port which need the leaset compensation capacity. In the end,the simulationresult on AC-DC-AC electrical locomoter load shows the correctness and validity of the proposed theory.,

Abstract: In this paper , the high purity liquid reactive black was prepared by using the membrane separationtechnology ,including the microfiltration(MF) membrane for removing particulate，the Charged-mosiac ,mem-brane(CMM) for desalination in the constant-volume filtration and the nanofiltration(NF) membrane for dehy-dration.The solid reactive black with high purity was prepared by spray drying.The experimental results showthat with the 61.5 g ·L ’ raw material liquid，under the pressure of 1.0 MPa, the salts were removed after 8hours desalination.The purity of dye could meet the requirement and the loss rate of the dye was 0.62% . Theaverage permeation flux of the charged-mosiac membrane was 18.5 L· m .h-’ during the desalinationprocess,which illustrated that the fouling of membrane was not so serious. Under the pressure of 1.4-1.8MPa , the reactive black concentration can achieve 250 g·L ’ by dehydration. The solid dye was prepared bythe spray drying.It was analysed that the inorganic salt in the product was lower than the imported productused by the enterprise. To sum up, the product prepared in the experiment has a good application prospect.

Abstract: A method was presented for the simultaneous determination of quinolinic acid and quinoline in theelectrochemical synthesis reaction liquid by high performance liquid chromatography ( HPLC). The analysiswas performed on a Hypersil C18 column with a mixture of V( methanol ):V( phosphate buffer solution with0.1% tetrabutyl ammonium hydroxide ,pH =7.0) = 50:50 as the mobile phase at a flow rate of 0.9 mL ·min’. The samples were detected at 254 nm with an UV detector and the column temperature was 30 ℃. Itwas found that quinolinic acid and quinoline could be well separated under the chromatographic conditions.The linear range of the mass concentration were 0.09 ~0.89 g·L ’ and 0.10 g·L-’ ~0.92 g ·L respec-tively. The recoveries for them were 98.4% ~ 102.0% and 98.80% ~ 99.70%. The maximum relativestandard deviations were 0.70% and 0.56% for quinolinic acid and quinoline.

Abstract: The shell-and-tube heat exchanger with longitudinal fluid flow in shell side was selected as the re-search object. The characteristics of fluid flow and heat transfer in shell side of shell-and-tube heat exchangerwith a ribbon support structure were studied numerically.Based on the characteristics of fluid flow and heat-transfer in shell side of heat exchanger,the periodic unit duct model was presented and adopted in the numeri-cal calculations for heat exchanger. The detailed information of the fluid flow and temperature field were ob-tained. The thermodynamic characteristics in shell side of the ribbon support structures with different parame-ters were analyzed comprehensively. In addition,the characteristics were compared with that of rod baffle heatexchanger,another heat exchanger with longitudinal fluid flow in shell side. lt is concluded that in the samecondition,in shell side with a ribbon support structure,fluid is of bigger turbulent intensity,which enhancesheat transfer.

Abstract: In view of the problems of shortage of carbon source and excess of nitrogen content in traditional ni-trogen and phosphorus removal,this paper adopts the method of magnesium ammonium phosphate (MAP)crystallization to recover a part of N and P to increase the ratio of carbon to nitrogen,which is beneficial forfollowing biological treatment. The results show that the optimal reaction condition,the molar ratio of n(Mg):n(N):n(P)=1.2∶1:0.9, was obtained through single factor experiment when choosing MgCl2·6H,0 Na,PO·12H,0 as magnesium source and phosphorus source. In this condition , the content of N, P, 0, and MgOof the sediment，slow-release organic fertilizer,recovered is 4.1 % , 40.77% and 15.85% , respectively.Af-ter recovering,the pH of the wastewater is about 8.5，the ratio of n( BOD,): n(N):n(P) almost 95: 5:1,the concentration of residual nitrogen and phosphorus approximately 170 mg/L and 20 mg/L, it can be reducedby with by microorganism treatment.

Abstract: In this paper, a static high gravity gas hydrate reactor was introduced into, and the CO, gas hydrateformation process was continuous with the processing equipment. The influence of the high gravity factor on theimportant parameters during the CO, hydrate formation process in the new hydrate reactor was investigated. Itwas shown that the CO,hydrate formation rate increased with the high gravity factor by the exponential func-tion.When the high gravity factor was 390.285,the maximal value of the CO,hydrate formation rate was upto 36.85kg/ h. Within the experiments,the change process was similar to a parabola between the CO,gas per-cent conversion rate and the high gravity factor. When the high gravity factor was about 250, the CO, gas con-version was up to the perk value，but on the whole of it was not more than 27% . Besides thermal analysis onthe processes were investigated with the high gravity factor from 20.162 to 390.285. It was found that the en-ergy utilization efficiency increased as a linear function with the high gravity factor,which the maximum valuewas 87.39% .

Abstract: The ultraviolet and infrared optical properties of glasses were studied when BaF,was substituted byBa(P0, ) , in fluoroaluminate glass by ultraviolet and infrared spectroscopy methods.Research indicates that,the introduction of Ba(P0, ) , can reduce the scattering and the absorption of crystal defects in glass,and cau-ses a migration of ultraviolet absorption edge to short wavelength. However,due to the intrinsic absorption,the ultraviolet absorption edge moves to long wavelength again with the increase of Ba(PO, ) , content, and theglass with 1% mole Ba( P0, ),content has the shortest ultraviolet cut -off wavelength.The phosphorus - oxy-gen bond(P- O) vibration produces a strong absorption peak at about 4700 nm,and the vibration of P- O -H bond results in the absorption peak of 5850 nm,that cause the shift of infrared absorption edge to shortwavelength direction. Influenced by hydrogen bonds,the absorption peak of hydroxyl group shifts to longerwavelength,and obviously broadened,reducing the transmission of glass in 3000 ~ 4000 nm scope.

Abstract: The ultraviolet and infrared optical properties of glasses were studied when BaF, was substituted byBa(PO,), in fluoroaluminate glass by ultraviolet and infrared spectroscopy methods.Research indicates that,the introduction of Ba(P0, ) , can reduce the scattering and the absorption of crystal defects in glass，and cau-ses a migration of ultraviolet absorption edge to short wavelength.However， due to the intrinsic absorption，the ultraviolet absorption edge moves to long wavelength again with the increase of Ba(PO, ) , content， and theglass with 1% mole Ba( P0,) , content has the shortest ultraviolet cut - off wavelength.The phosphorus - oxy-gen bond( P - O) vibration produces a strong absorption peak at about 4700 nm， and the vibration of P - O -H bond results in the absorption peak of 5850 nm，that cause the shift of infrared absorption edge to shortwavelength direction. Influenced by hydrogen bonds，the absorption peak of hydroxyl group shifts to longerwavelength，and obviously broadened，reducing the transmission of glass in 3000 ~ 4000 nm scope.

Abstract: Abstract: Using MgCl2·6H,0 and CO(NH2) , as raw materials，PVA as dispersing agent, we have first syn-thesized Mg( OH)2, precursor with a homogeneous precipitation method，and the nanometer sized magnesiumoxide ( nano-Mg0) with average size of 50 nm is obtained by calcinations of the precursor. The effects of reac-tion temperature，reaction time and reactant ratio on yield of Mg(OH)2, are investigated.The calcination tech-nology of nano-Mg0 is determined by the analysis of apparent specific volume. Morphological structure of thenano-Mg0 is analyzed by SEM. The optimized reaction parameters for synthesizing Mg( OH)2 , are : the reactiontemperature: 100 ℃ , the reaction time: 4 h，reactant molar ratio: ( CO(NH2), to MgCl2·6H,0)=6:1,best calcination temperature : 500 ℃ and calcination time : 1.5 h.

Abstract: Taking PAN as indicator,a precise content analysis method of the activated aluminum which con-sists in calcined kaolin in the different temperature by the EDTA volumetric method is introduced in this pa-per. The color change of end-point is obvious. And the effect about content of activated aluminum based onin-situ crystallization synthesis of ZSM -5 is also discussed.ZSM -5 is difficult to be synthesized in situ crys-tallization in the kaolin calcined at 750 ℃ or at 950 ℃ added to the aluminum source.Crystallization productswith little impure crystal,high degree was synthesized under the following conditions: the kaolin calcined at950 ℃ as carrier and the only source of aluminum，adjunction of silicon source, appropriate regulation of al-kali,silicon and water content,synthesis temperature of 150 ℃. With this method，A distinction should bemade between the difference in kaolin carrier of aluminum and used for the synthesis of active aluminum. Andthis paper presents a general method that act Si ( activated silicon )-Al ( activated aluminum ) ratio as the ratioof synthetic zeolite in situ crystallization.

Abstract: In view of the high BER (Bit Error Rate ) caused by a variety of interference in the aeronauticalcommunications， this paper proposes the multi-aircraft cooperative communication scheme for the case that adirect link does or doesn ’t exist separately to improve the diversity gain in aeronautical channel.The proposedscheme could achieve high data rate，effectively resist multi-path fading， and expand the communication rangein conditions of fixed airborne communication equipment modulation and constant transmission power. By ana-lyzing whether there is a direct link for transmitting signals in VHF channel,we give both the amplify-and-for-ward and decode-and-forward cooperative communication mode based on the model of aeronautical channel.What ’s more，the maximum ratio combining method is utilized to improve the SNR ( Signal to Noise Ratio) atthe receiving end. Simulation results show that the multi-aircraft DF has optimal performance of BER when di-rect link exists , and the multi-aircraft AF has optimal performance of BER when direct link does not exist,when the parameters of air-to-air and air-to-ground channels are given.

Abstract: Abstract: An atomic absorption spectrophotometry method for the determination of Pb，Mn，and Fe in motorgasoline was studied. Digestion method for pretreatment of samples was proposed. And comparison of methodbetween this work and national standard was carried out.The results showed that the linear relation betweenabsorbance and ion concentration were good in the range of 0 ~4 mg ·L-’. The correlation coefficients wereall more than 0.999.The detection limit of Pb，Mn，and Fe which were all lower than the quantitative lowerlimits of national standard were 0.023 mg · L ’,0.068 mg · L’， and 0.012 mg ·L ’ , respectively.Theaverage error and relative standard deviation of measurement were all lower than 0.02 which showed that thep-recision and accuracy of this method is satisfied. The values of recovery of Pb，Mn， and Fe were in the rangeof 92.5% ~98.1% ,95.6% ~106.2% , and 96.8% ~107.1 % , respectively. It showed that the recovery ishigh and the method is accurate.The content of Pb，Mn，and Fe in five kinds of motor gasoline were deter-mined by methods of this work and national standard with an average error lower than 3. 5% which showed thatthe method is reliable.

Abstract: A numerical simulation on bulk heterojunction(BHI) organic solar cells by decouple algorithm putforward by Cummel is described in this paper. The distance between the top and bottom electrode is meshed e-quidistantly， and the basic equations are turned into finite dfference discrete forms under the one dimensionalmodel，then the nonlinear equations are converted into linearization with the Newton-Raphson method.Numer-ical solution can be obtained in this way. The correetness of this solution is verified with computer simulation.

Abstract: In this paper.we extract the low and high frequency data information of the image and divide thedata information according to their importance based on wavelet transform.Then we use the unequal error pro-tection scheme combined with the Turbo codes to protect the image data. And the results show the scheme weproposed can improve the quality of the image.

Abstract: As for hyper-singular integral equation methods procedures in the crack problem，how to get a fastcomputing speed is the first thing that must be considered. This paper deals with the programming on the arecrack in the plane bi-material , sets forth the numerical integration method，the method solving equations，theaccuracy control of the stress intensity factors，etc. and the corresponding Fortran routines are given. The re-sults of actual program running shows that the methods can get the result quickly enough and meet the require-ments of the calculation accuracy.