The layered perovskite-type organic-inorganic hybrids(CnH2n+1NH3)2MnCl4(n=2,4,6,8,10,12) were synthesized in solution and their structures were characterized.The results showed that the structures of the products were independent on the reaction initial temperature.The X-ray diffraction(XRD) patterns and the scanning electron microscopy(SEM) images of the products demonstrated that the hybrids crystallize very well and had typical layered structures.The interlayer distance of each hybrid was obtained from t...

A series of cellulose/soy protein isolate blend membranes were prepared from cellulose/soy protein isolate solution by coagulating with 5% acetic acid,5% sulfuric acid,5% phosphoric acid,5% oxalic acid,and 5% calcium chloride solution,respectively.The effects of different coagulation system on the structure and mechanical properties of the blend membranes were investigated by various methods.The results revealed that the membranes exhibited porous structure.The pore size in the surfaces and cross-sections o...

The 2-D CuO nanoplatelets were synthesized by solvothermal reaction using CuCl2·2H2O and NaOH as raw materials in the mixed solvents of ionic liquids and water.CuO nanoplatelets were prepared based on self-assembly by ionic liquids working as structure-directing agent.Morphology control of CuO could be achieved by varying reaction temperature,surfactant and the anion type of 1,3-dialkylimidazolium based ionic liquids.The formation mechanism of CuO nanoplatelets was discussed.XRD,FESEM,and TEM/SAED were used...

Based on the research of body decoration on the ceramic wine bottle made with Yellow River silt,a series of semi-frit glaze was made.The performance and microstructure of specimens were tested by TG-DTA,XRD,SEM and so on.The factors which would influence the firing temperature of the glaze were discussed,the opacifying mechanism of glaze and body-glaze fit were also approached.The results showed that the best semi-fritted glaze recipe with fine opacifying effect was D-2,the firing temperature was 1 120 ℃,th...

The relations between composition,structure,chemical bond and property of TiC and Fe single phase,composites of TiC ceramic and doped series,and composites of TiC/Fe ceramic and doped series were researched by using density function and discrete variation method(DFT-DVM).The ionic bond of TiC/Fe was weaker than that of TiC single phase,but the covalent bond of TiC/Fe was stronger than that of TiC.There were strong ionic and covalent interactions among the ions in on the interface between the phases.Furtherm...

The impacts of three different defoaming agents on stability and rheology of a modified SiC slurry were investigated and the relations in surface tension and defoaming effect of defoaming agents and density of green body were researched.The results showed that the impacts of defoaming agents on stability of slurry were not great.With amount of nonion/anion compounded defoaming agent increasing,slurry was changed into pseudo-plastic fluid from dilatants fluid,and at 0.1%amount viscidity of slurry was lowest ...

The synthetical experiments of zeolite A from fly ash and the crystal growth process were investigated in the hydrothermal system,a new growth process of zeolite A has been found,hence the new growth mechanism of hydrothermal synthesis of zeolite A from fly ash was proposed.The results proved that calcination in expecial alkalinizing calcination could improve the reactive activation of fly ash, the results also showed that the some phases of formation of the grains of zeolite A at hydrothermal condition wer...

Firstly,the cement flocculation particle distribution after SP added was tested.Then,fractal dimensions(Df) were counted.Finally,the relationship between Df and dosage of SP was discussed.The results indicated that the Df was affected greatly by the dosage of SP.When the dosage reached certain range for different SP,a saltation of Df would occur.The dosage range corresponding to the saltation of SPs fit well with the saturation point measured by cement paste fluidity.Thus the saturation point of SPs could b...

Using MTS,series of experiments to research the anti-erosion ability of cement-stabilized grain with fiber of different length and volume percentage were carried out,the test results of specimens with and without fiber were compared,and the anti-erosion mechanism of fiber were analyzed.The results indicated that polypropylene fiber can effectively enhance grain’s anti-erosion performance,up to more than 40% when appended with a reasonable fiber mixture ratio.The research showed that grain’s anti-erosion abi...

Mechanic performance of concrete with different kinds of aggregate was tested in this study.The results showed that concrete with waste glass as aggregate had better performance than concrete with normal sand and gravel as aggregate at elevated temperature.Addition of polypropylene fibers into concrete improves the performance at elevated temperature.Concrete with waste glass as aggregate used at elevated temperature was economical and durable due to the loss of water,which prevented the occurrence of alkal...

Microstructure and chemical composition changes were examined by scanning electron microscopy(SEM) and X-ray diffraction(XRD).Chloride migration coefficient was determined according to NEL method.Impact of high temperature on service life was evaluated by model of chloride migration theory and model of concrete carbonation.Service life evaluation based on chloride migration coefficient revealed that service life changed little exposed to 200 ℃ for 3 h and decreases by 60%,90% repectively exposed to 300 ℃,40...

Using high temperature X-ray diffractometer,the analcime in cretaceous sedimentary rocks in Ordos Basin,northwest China was analyzed.The temperature ranged from room temperature to 1 350 ℃ at 50 ℃ or 100 ℃ intervals.The results indicated that the position and intensity of each diffraction peak of analcime regularly changed with that of the temperature.With the help of least square method(Program 9214),the paper calculated the unit cell parameter of analcime, and determined that the analcime was cubic at roo...

The permeability of fiber performs is the most important parameter in the study of the liquid composites modeling(LCM),it must be ascertained accurately.In this paper the Darcy’s law was used as the fundamentals to determine the permeability of fiber performs,and an experiment installation was designed.The installation was designed base on condition of two different inject pressure and tow different fiber volumes(or porosity).The processes of the planar unidirectional liquid flatting between the multilayer ...

The equivalent stress diagram of concrete was discussed,when the failure mode of tension destruction occurred.Based the definition of the minimum reinforcement ratio of the reinforced concrete column,the minimum reinforcement ratio of the compressive and flexural concrete members reinforced with FRP tendons was introduced.According to the analysis results about the boundary point of the failure mode of tension and compression,the limit reinforcement ratio of the compressive and flexural concrete members rei...The equivalent stress diagram of concrete was discussed,when the failure mode of tension destruction occurred.Based the definition of the minimum reinforcement ratio of the reinforced concrete column,the minimum reinforcement ratio of the compressive and flexural concrete members reinforced with FRP tendons was introduced.According to the analysis results about the boundary point of the failure mode of tension and compression,the limit reinforcement ratio of the compressive and flexural concrete members rei...The equivalent stress diagram of concrete was discussed,when the failure mode of tension destruction occurred.Based the definition of the minimum reinforcement ratio of the reinforced concrete column,the minimum reinforcement ratio of the compressive and flexural concrete members reinforced with FRP tendons was introduced.According to the analysis results about the boundary point of the failure mode of tension and compression,the limit reinforcement ratio of the compressive and flexural concrete members rei...

This article adopted Ritz method and divide-fit mathematical method,solved the problem of elastic buckling of thin plate under compression and bend multiplicity action.First,overwrite the energy equation of thin plate according to Ritz method,utilized minimum potential energy principle and Matlab,employed divide method and obtained the accurate solution at dividing point.By using dividing data,the critical curve for the plate buckling was given under the compression and bending action.Finally,using the resu...

The mode Ⅱ fracture experiment for different RCC layer surface and body specimens was carried out and shear fracture parameters were obtained.The variation of fracture toughness of all kinds of layer surface was summarized on the analysis of tests results,the reason of which was analyzed from microstructure.The effect of treatment and interval time of the RCC layer surface on fracture properties of that were compared,and then the merits of shear fracture characteristics of the RCC layer surfaces were judged...

Based on the theory of thermo-elastic-plastic,changes of material properties with temperature were considered,and the strain-stress-temperature coupling constitutive equations on thermo-elastic-plastic of flexural reinforced concrete members were deduced.Based on the assumption of M- nonlinear analysis method,the finite element equilibrium equations about this model were developed by taking strain ε0 and curvature  as basic variations.Nonlinear equations would converge rapidly by utilizing this analytical...

It has been well documented that downbursts cause frequent failures of high voltage electricity transmission towers in the world.Based on the previous research,the paper discussed the numerical simulation method of downburst wind loads.Firstly,a deterministic-stochastic hybrid model of downburst was proposed.Secondly,a modified spectral representation method of adding turbulence to the non-turbulent wind speed was presented.The various aspects of the model were then integrated to create a method suitable fo...

Based on Newton’s laws of motion,the inner oscillatory differential equation which considered the excitations at both beam and tower end was deduced.Analyzing the vibration characteristic relations with those ingredients such as the matching ratio of natural frequencies of tower end,beam deck to stay cable,the initial forces of cables,excitation amplitude,and initial oscillate displacement and damping ratio.Secondly,the oscillatory equilibrium equation in stay cable loosening state was established with the ...

The two-step structure damage identification method based on wavelet analysis and support vector machines was proposed in this paper.Firstly the irregularity of signal was analyzed by wavelet transform and the exact time when the structure damage occurs was estimated.Secondly,the wavelet packet signal component node energy containing structure damage information was extracted,which was selected as the sample of support vector machines to establish SVM model to carry on damage localization of the structure.T...

The mechanic model of pile in layered soils was established in the text.By taking advantage of the interaction between pile and soil,the semi-analytical solution of vertical vibration on pile was derived under any load on the top of pile on the base of Laplace transform and matrix theory.Under the condition of simplifying external load as semi-sine impulse exciting,the displacements response of various dot in the pile was calculated.The feasibility of this mothed was assured by comparing the theoretical ana...

Based on the catenary theory of cables,an iteration method was presented for the shape-finding analysis of spatial-cable suspension bridges.With the method,some information such as the internal forces,dimensional coordinates and strained or unstrained length of the main cables and hangers could be obtained.A computational program was worked out and it was proved that the method was feasible for spatial-cable suspension bridges,with the features of precision and rapidness in calculation.

The basis theory and hypothesis of finite element method(FEM) computing for steel bridges deck surfacing were proposed.According to the general parameters of steel-box joist deck and surfacing structure of long-span steel bridges in China,the relations between each mechanical index and the elastic modulus of asphalt mixture surfacing materials and the most disadvantaged loading position were analyzed,the most dangerous points were also confirmed which were used as control targets in structure design.In the ...

The deformation and acoustic emission properties of granite during failure process were researched through triaxial compression experiment.The effect of confining pressure on deformation property and acoustic emission property of granite was analyzed.The results showed that there was a better consistency between deformation property and acoustic emission property of granite.So,the slowly increasing phase of acoustic emission could be used to estimate the elastic phase and the elastic limit strength of rock,...

This article put forward the intensified technic of UASB(upflow anaerobic sludge blanket),and did parallel experiment with it to deal with the Leachate of Huangshi and Wuhan.According to the data,the effect of UASB reactor could be intensified by adding slender granule activated charcoal.The temperature was extended to 10—20 ℃,and the disposal effect was preferable.Under normal temperature,the removal rate of CODCr,BOD5 is above 50%,and NH3-N was above 60%.The time to form granule sludge was shorten from 53...

When influent pH kept at 8.0 and the temperature kept at(30±0.5)℃,the anaerobic ammonia oxidation(Anammox) bioreactor was successfully started up in 120 days with the nitrification biofilm as inoculum.The results showed,the volumetric total nitrogen loading rate was 0.109 kg/(m3·d),the removal rate of ammonia,nitrite and total nitrogen were 86.68%、96.04% and 81.05%,individually.The ratio of NH+4-N removal,NO-2-N removal and NO-3-N production was 1∶1.16∶0.30.After the bioreactor was stopped 15 days,it took o...

J2EE platform provided CA authentication system with the mechanisms of cryptography,certificate and certificate path,security controllability of conversation and the distributed architecture.The scheme of JBCA authentication system based on J2EE architecture and double certificates pattern was described,and the security mechanism of signature private key applied to issue certificates was analyzed.The certificates issuing and managing system based on EJB program technology practically solved the difficulty o...

Since the dynamic topology of wireless networks was common in actual condition,the delay-tolerant mobile sensor network made the end-to-end custody transfer by using a distributed store-and-forward mechanism.An adaptive routing based on Kalman filter prediction theory for DTMSN was raised.The new improvement was to use local evaluation of the probability of nodes and selec the right message carriers.Some simulation and analysis proved that this method had a good performance in DTMSN.The protocol reduced the...

Aiming to conduct a reliable estimate,it can be completed in a relatively small region of the search template and improve real time quality.Kalman filter is a linear sequence of the dynamic systems,the state minimum variance estimation algorithm,but not fit for nonlinear and/or non-gaussian problems.In view of this vacancy,particle filter was used to estimate position for nonlinear and/or non-gaussian problems,which was a new filtering method based on Bayesian estimation and Monte Carlo method and could eff...

Obtain Pareto optimization solutions fast is one of the important purposes of multi-objective optimization.The artificial immune system can restrain or promote antibodies production to achieve this purpose.The proposed approach used Pareto dominance、P competition selection、 degenerate solutions selection and real encode.Simulation results showed that the MISA was able to find much better diversity of solutions and better convergence near the true Pareto-optimal front in three objectives compared to NSGAⅡ th...

The general theory and methods from geometrical optics to measure the dimension of an object were applied to design a diameter measuring system,which was based on a linear array image sensor.A polynomial differential technique was used to acquire edge point data.Some factors that affect the precision of diameter measuring system were also discussed.All kinds of errors were measured or estimated in test.Finally,the precision of measure equipment was obtained.Testing results showed that this system runs stabl...

According to the data of oil field testing and experimental study,the mathematical model and numerical model of non-linear flow were established that based on non-linear flow law.The software of three dimension(3D) and two phases reservoir simulation for non-linear flow has good stability,prompt convergence speed.It can solve linear flow and non-linear flow problem.It also can describe non-linear relationship using experience formula and numerical method.The solution of non-linear flow factor came from nume...According to the data of oil field testing and experimental study,the mathematical model and numerical model of non-linear flow were established that based on non-linear flow law.The software of three dimension(3D) and two phases reservoir simulation for non-linear flow has good stability,prompt convergence speed.It can solve linear flow and non-linear flow problem.It also can describe non-linear relationship using experience formula and numerical method.The solution of non-linear flow factor came from nume...

A design scheme about embedded USB host for the black box on car was introduced including interface circuit of its control chip SL811HS and its various components、work principle,software flows and so on.Due to USB specifications 1.1,mass storage class specifications and FAT16 file system criterion, architecture of USB specification was described.As a result,it effectively enabled to identify and read-write U disk.

As the basic protocol in the next generation Internet,IPv6 considered the factor of security in addition to interconnectivity.IPv6 used IPSec(IP Security) to implement encryption and authentication at the network layer.The thesis emphasized to analyze the IPv6 security protocols.The Secure enterprise virtual private network was established in the Internet by using IPSec security tunnel.Thereby the information could be transferred securely between the enterprises.

The finite element analysis(FEA) model,solution and post-preprocessing were carried out through ANSYS program.And the magnetic flux density,magnetic attractive force,magnetic flux distribution were calculated.The authors used Lakeshore 410 Gauss-meter to measure the magnetic flux density in the air between magnetic pole and the levitated ball.The calculated results and measurement data were compared and analyzed.The comparison result indicated that the calculation results were consistent with the measuremen...
【基金】 国家自然科学基金(50675163)

The forces on fin stabilizer in non-steady flow were analyzed analytically.Then the expression of lift produced by liquid was given.Phase difference between angular velocity and lift of fin stabilizer at zero speed was analyzed quantificational based on lift model,and the method to compensate the phase difference was presented.A lift restrictor was designed to change the angular velocity limitation to meet the different requirements for start and break,because the phase difference cannot be compensated when...

A structure of fiber grating weight-in-motion system,and a dynamically mathematical model which couples the vehicles and WIM system according to the theory of vibration mechanics were introduced.The data processing of this method was based on the recursive least squares(RLS) algorithm and realized online parameter estimation.The software of algorithm was M language of Matlab.Comparing the results of this algorithm with the results of AR4,the precision could be improved from 2 times to 5 times.

Frame is the key of vehicles,so it is important to analyze and study its structure,above all,the simulation of suspension and connecting parts is an important step during the model built-up period.A finite element model was established for the frame of light truck based on composite elements,which was used to analyze the stress level and distribution on the frame in typical conditions.Under the guidance of the analyzed results,the design of the frame was optimized and the suggestions to design improvement w...

The paper introduced the designing and developing process of hard and soft wares of electricity-heat pot’s mechanical and electrical control system.Firstly,it put forward a reasonable solving plan to overcome the shortcoming and some hidden dangers of the traditional cooker.Then,using the single-chip computer AT89C52 as the center,it adopted the designing method of embedded system and the technology of computer control,and it realized the automatic operation and safety monitor systems.It formed a set of pra...

Considering the two-echelon logistics service supply chain(LSSC)consisted of a logistics service integrator(LSI) and a functional logistics service provider(FLSP),based on the characteristic of LSSC,a cost model of LSI and a profit model of FLSP under uncertainty were put forward.Then the coordination model under Stackelberg game was built.Using the software of Matlab 7.0,the simulation results were given.The cooperation with no mated capacity constraint was less cost and greater profit than it with mated c...

Money laundering behavior recognition was a process of knowledge discovery in databases(KDD).Data Mining was an important technique of KDD.In this paper,the characteristics of Chinese foreign exchange money laundering activities,and combine decision tree approach with financial domain knowledge were analyzed.The suitable money laundering transaction recognition strategy and method were chosen.By making full use of the real transaction data to carry on the experiment,useful rules of money laundering were dis...

The reliability data followed exponential distribution both the before and the behind of the change-point was analyzed.The model of failure’s distribution of the product was established and brought forward two methods test and estimation the change-point.The compared results indicated the two methods were feasibile and valid.

The paper measured the investment risk through the fluctuation of NPV which influenced by annual EVA.That means describe the stability of risk of investment indirectly by the stability of EVA.At first,the NPV of estate investment which based on CAMP and EVA was compared and analyzed.Then the effect of annual EVA’s movement on NPV through the analysis of the mean and variance of NPV of real estate investment which based on EVA was analyzed.At last,the interaction and movement of EVA,(CI-CO)i and Ci by using ...