Abstract:A nonlinear finite-element analysis of multiplanar circular tubular KT-joints was carried out in this paper,and the behavior of the tubular KT-joints was described.The result showed that there were two failure modes of the joints with the variance of diff

Abstract:Using the finite element method,this paper computed and analyzed the stability of cable-stayed concrete filled steel tube arch bridge.Citing the Fourth Bridge over Xiangjiang River in Xiangtan City as an example and adopting the linear elastic characteris

Abstract:A 1/2-scale frame model of dynamic soil-pile-structure interaction was designed and manufactured,and the tests of its steady state excitation in elastic range were carried out.The dynamic responses of steady state excitation tests under three circumstance

Abstract:Four full-size RC beams strengthened with carbon fiber plates(CFP) were tested.The experimental results showed that the consumption of carbon fiber sheets had significant effects on failure modes and the flexural capacity.Based on the limit failure mode a

Abstract:The pile-soft soil interaction behavior under a surcharge load was investigated by means of three dimensional finite element analysis.The non-linear constitutive model and large strain were used to describe the soil,and the contact elements were defined t

Abstract:Soil-rock-mixture is a typical porous medium,and its permeability is closely related to the content of gravel.By means of our own constant head permeameter,we have measured the permeability coefficients of soil-rock-mixtures with different gravel content,

Abstract:A method for slope stability calculation was introduced.FEM software Marc was adopted to calculate the stress on the slope,and geometrical non-linearity and material non-linearity were considered.The slip surface was simulated with a broken line.The progr

Abstract:To investigate the buckling load and post-buckling equilibrium path of an axially loaded pile entirely embedded in a soil,the non-linear large deflection differential equation for pinned pile,based on the Winkler-model,was first established in the energy

Abstract:Transient wave propagation in inhomogeneous damaged concrete media was investigated.The continuous inhomogeneous damaged concrete media was approximately treated as stratiform homogeneous damage.Using spectra transfer-matrix and signal processing,impulse

Abstract:The motion model of soccer robot based on little angle was constructed.The mono-neural self-adaptive PID control algorithm and PID control algorithm based on Kalman filter were proposed.The simulation results indicated that the overshooting number,risetim

Abstract:A rhombic new concept car is characterized with a rhombic configuration of 4 wheels,which has the advantage of avoiding forward collision,excellent mobility,and low wind resistive factor over traditional cars.A linear 2 DOF vehicle model with three wheels

Abstract:By constructing the geometrical model of a certain underground single arm type pantograph and applying the translation of pantograph-head balancing bar and the perpendicular displacement of pantograph in the direction of the movement of locomotive while r

Abstract:The characteristic of planet globoidal cams reducer mechanisms was analyzed and studied from the angles of geometry and kinematics.Based on matrix transformation and conjugation engagement theory of spatial mechanisms,the surface equation and pressure ang

Abstract:SAR(Synthetic Aperture Radar) images' registration is an important process for generating DEM using SAR interferometry technique,while coarse registration is the basic step of SAR images' registration.This paper proposes a new automatic SAR images coarse

Abstract:Based on the shortages of EXB841's typical driving circuit for Insulated Gate Bipolar Transistor(IGBT),some effective countermeasures,which included the external grid-voltage molding circuit to boost grid-voltage,the over-protection detection circuit to m

Abstract:提出了一种高效低功耗的JPEG2000小波变换器的硬件结构,减小了二维离散小波变换器(2-D DWT)中暂存器的大小,降低了存储器的平均访问带宽,有效减小了芯片的面积和功耗.整个设计通过了FPGA验证,并采用HJTC 0.18μm工艺库进行了芯片设计.试验结果表明,片内暂存器的面积和功耗比普通方法分别减小了54.5%和61.4%.

Abstract:A new approach for the design of two-dimensional(2-D) finite-impulse response(FIR) linear-phase digital filters is presented based on a parallel neural networks algorithm(PNNA) by analyzing the characteristics of 2-D FIR linear-phase filters,its main idea

Abstract:The relationship of stress and strain was obtained on the basis of the nonlocal elastic theory.The governing differential equation was derived with the help of these basic equations and equilibrium condition.The inner characteristic length was incorporate

Abstract:Fe3O4/PANI nano-composites were prepared through in situ reaction. The microwave electromagnetic characteristic and the absorption property of the specimens in 2 - 18 GHz and the effect of composite material composition on electrical conductivity and dens

Abstract:A first-principles plane-wave pseudopotential method based on the density functional theory was used to investigate the energy and electronic structure of magnesium hydride(MgH_2) alloyed by X(X=Si,Ge,Sn,Pb).Through calculations of the negative heat of fo

Abstract:柠檬酸作络合剂和燃料,硝酸盐作氧化剂,利用柠檬酸硝酸盐低温燃烧法合成了具有单一组成的Ce0.8Y0.2O1.9超细粉体.研究了不同氧化剂用量对凝胶的燃烧特性及粉体性能的影响.用TG-DTA,XRD,FTIR,TEM,Raman等分析方法对凝胶的分解和合成粉体的性能进行了表征.结果表明,通过调节氧化剂的用量,可以控制粉体的粒度及产物中碳酸盐的含量.TEM研究表明,改变氧化剂的加入量可以获得颗粒尺寸约为40 nm、粒度分布均匀的粉体.Raman光谱研究表明,随氧化剂用量的增加,氧空位的浓度增大.

Abstract:对直接浸渗法制备MoSi2/SiC复合材料在1 300℃下的氧化试样的质量变化进行了研究.观察与分析了氧化层的形貌和相组成.结果表明,复合材料在该温度下保温时间较短时其氧化模式为硅、钼同时氧化,复合材料表现为失重,形成的氧化层结构疏松,存在大量气孔;保温时间较长时氧化模式为硅的选择性氧化,材料表面形成致密的SiO2氧化层,复合材料表现为增重.同时复合材料的抗氧化性与材料的孔隙率和SiC颗粒大小有关,孔隙率越高,SiC颗粒越小,抗氧化性越差.研究表明MoSi2/SiC复合材料可用作1 300℃下的抗氧化材料.

Abstract:以3,5-二羟基苯甲酸和间苯二酚为原料,分别经酯化、乙酰化、甲氧甲氧基保护或甲基化、酰肼化、氧化、醛酮缩合、环化、Algar-Flynn-Oyamada反应以及脱保护基等步骤,以21%~32%的总收率合成了7,3’,5’-三取代黄烷酮1a~1b和黄酮醇类化合物2a~2b,所有合成产物通过1H NMR,IR,MS进行了结构确证.其中黄烷酮1b是从药用植物中间锦鸡儿Caragana intermedia Kang etH.C.Fu中分离得到的新天然有机化合物,此次为首次全合成.

Abstract:In order to find new pesticides with higher effectiveness and lower toxicity,seven methyl N-methoxy-N-{2-[methylthiomethano(substituted-phenylimino)thiomethylene]phenyl}-carbamates were synthesized according to the substructure link principle.All compound

Abstract:This paper introduces the synthesis of Starch-Selenium nanoparticle through redox reaction using nanotechnology in redox system,with natural starch as the templet.The particles were characterized with a transmission electron microscope and Zeta-Sizer meas

Abstract:以污水厂剩余污泥为原料,以氯化锌和硝酸铁为活化药剂,制备了新型碳质催化剂,主要制备步骤包括化学活化、浸渍、热解和洗涤.通过扫描电镜、BET表面积和热重分析对催化剂进行了表征分析.结果显示,催化剂表面具有丰富的孔结构,BET比表面积可达307 m2/g或更大.考察了它们在NH3选择催化还原NOx中的催化活性,同时考察了n(Zn2 )/n(Fe3 )、热解温度、氧气体积分数对催化剂活性的影响.实验结果表明:控制n(Zn2 )/n(Fe3 )为1∶0.5,750℃热解制得的催化剂活性最好,在反应温度400℃时最高NOx转化率可达98.3%;催化反应在氧气体积分数为15%,温度350~450℃条件下进行较好.

Abstract:In the selection of techniques,the uncertain multi-objective decision-making has a simple accounting step.However,how to scientifically standardize these uncertain numbers is still puzzling many users.All attitudes of experts are suggested to be described

Abstract:Based on intrusion detection common intrusion detection framework(CIDF) architecture,a new network intrusion detection model of multi-data packages analysis was presented. In this model current affair was transacted by two steps through affair analyzer: F

Abstract:We proposed a new mechanism called Optimized_RED to improve the performance of queue management of P2P network.Under the RED(Random Early Detection) mechanism for queue management,bandwidth can not be allocated fairly for each flow.The Optimized_-RED mech

Abstract:The commutators generated by the Littlewood-Paley operator and the BMO functions were introduced,and the H~1 estimates for the commutators were obtained by using the atomic decompositions.

Abstract:We applied a new method,i.e.the critical point method to investigate a class of second-order discrete boundary value problems,some new sufficient conditions for the existence of solutions were obtained.

Abstract:By constructing suitable cone and applying the decomposition technique of equation,the positive solutions are investigated for a class of semilinear fourth-order boundary value problems with first derivative.Main tools are a Green function of the third-or

Abstract:The paper presents an open economic version of Lucas growth model,where the agent can freely allocate his labor time to produce the final goods or accumulate human capital in the education sector.The government may collect taxes to subsidize the accumulat