Abstract:Aiming at the effect of piles-soil interaction on high pier stability, this paper, based on the equal force- effect principle, substituted pile foundation to a "pier-style + level spring" mode to simulate that effect, then a critical load calculation method considering the pier- piles-soil system under the vertical load was developed. And to validate the method proposed, an engineering example was illustrated. The calculation results have shown that this method is reasonable. Finally, based on the example and formula, the effect of pier stiffness and height changes on the system stability was analyzed, and the results have shown that the pier stiffness and height are two important performances to the system. Structure buckling is not a material damage problem, but has an optimal stiffness and length ratio in high pier and pile foundation system, which makes every part of the structure work in coordination.

Abstract:For the folded line type three-dimensional (3D) trussed arches, four arrangement styles of cables in the arch plane were presented. The static and stability property of the pretensioned 3D trussed arch in those four arrangement styles was studied. The numerical results including the decrease in structural displacement, the initial tensile force of cables, the reduction in horizontal reaction force, the uniformity of distribution of member forces and the improvement of structural stability were compared with those of the corresponding 3D-trussed arch, and it has been shown that the mechanical properties of the arch can be greatly improved with the arrangement style where the struts and cables were arranged according to the buckling shape of the arch subjected to the ultimate load. In addition, the analysis results of the instability modes of the pretensioned 3D-trussed arch indicate that the global deformation of the arch can be controlled effectively by introducing struts to the prestressing system.

Abstract:Based on the HHT (Hilbert-Huang Transform), the ChebyshevⅠtype filter was adopted to process the measured free vibration signal to solve the mode-mixing problem, so that all the structural modes could be acquired from IMFs. Meanwhile, removing endpoints were used during the linear least-square fit procedure to avoid the endpoint effect. Besides obtaining the modal frequencies and damping ratios, the formulation of mode shapes of proportional-damping structure was also derived. The simulation results of 4-NDOF numerical case and 4-NDOF frame structure in the laboratory have demonstrated that the proposed approach is accurate and effective.

Abstract:To realize the accurate estimation of battery SOC and increase the precision of battery model, by inoculating standard battery model from equivalent circuit model PNGV battery test manual and based on instrumental variable technique and least squares technique, an online hybrid power metal hydride electric batteries parameters estimation algorithm was proposed to establish battery model using MATLB/SIMULINK. Simulation analysis has shown that the maximal error of battery model voltage is 4.2 V, the mean error is 0.57 V, and the maximal error of the accurate estimate of SOC is 0.048. The mean error is 0.011. It can follow the true data well.

Abstract:This paper studied how to achieve hybrid electric vehicle's electric mode and engine mode switching smoothly. The main principle is the same driving torque. This paper proposed a new algorithm for the motor torque to achieve it. According to velocity and throttle and CVT's ratio, this algorithm obtains engine pseudo-target speed. According to engine output characteristics and throttle opening and engine speed，we got the engine output torque. And then we derived the motor output torque. Simulation results have shown that before and after mode switching, the vehicle drive torque is basically the same. It has been proved that the algorithm can achieve the smoothness of mode switching.

Abstract:In order to solve the problems of completeness and consistency of maintenance information in the process of product lifecycle, the architecture and theory of Multi-body structure maintenance information modeling for Multi-layer representation were proposed. The implementation of Basic Body，Retrieval Body and Control Body was given. This model applies attribute mechanism to constitute the mapping of geometry topology information and non-geometry information. For example, the maintenance information of model, and the structure of multi-layer representation for assembly model information are constructed by framework of tree structure. It can satisfy the requirements of representation completeness and dynamic following in virtual maintenance. Its feasibility is verified by research results.

Abstract:The negative stiffness properties of a mechanism and the quasi-zero stiffness properties of a vibration isolation system of the mechanism after being merged into the linear main spring were analyzed. The main harmonic, sub-harmonic and super- harmonic resonance amplitude-frequency response expressions of passive isolation system with quasi zero stiffness were derived. The results have shown that the negative stiffness region broadens as the ratio of the initial deformation of the spring to the length of the bar increases. The quasi-zero stiffness region of the vibration isolation system broadens as the ratio of the stiffness of the main spring to the total stiffness of the spring in the mechanism and the ratio of the initial deformation of the spring to the length of the bar in the mechanism increase. Compared with the amplitude-frequency characteristics of Duffing equation, the corresponding harmonic response amplitude-frequency characteristics of the passive vibration isolation system demonstrate great deviation. To the motion differential equations of this kind of passive isolation system, there is comparatively larger deviation when the product of the displacement exciting amplitude and the square of exciting frequency replace the exciting force amplitude of unit quality as the solution of Duffing equation.

Abstract:In order to overcome the shortcomings of the stator flux and torque ripple existing in the conventional direct torque control(DTC) system of permanent magnet synchronous motor(PMSM), this paper put forward an improved method using the variable parameter PI speed controller and fuzzy controller respectively to replace PI speed regulator and hysteresis comparator of the conventional DTC. On the basis of this, the new schematic of control strategy for PMSM DTC was rebuilt. The conventional PMSM DTC and the improved DTC system were simulated comparatively. The experiment results show that the improved system has good dynamic and static performance, 1ess flux and torque ripple, and can meet the performance requirements of the control system' fast response.

Abstract:Considering the gas mixing-and-pressurization process which is strongly coupled and disturbed in an iron and steel plant, a two-level-distributed system structure with process level and operation level was designed according to the requirements of the production process. By analyzing the system demands and functions of the software, the intelligent control algorithms were developed by utilizing function module reuse. The application programs were seamlessly linked with the distributed control system by using the OPC communication technology and the ATL packaging technology. The automatic control and real-time control of calorific value and pressure for the mixed gas were finally realized. Actual applications have shown that the results meet the requirements of process control, and the quality of gas is improved.

Abstract:A new spectrofluorimetric method has been developed for the quantitative determination of the alpinetin content in cell culture medium samples. This method combines excitation-emission matrix fluorescence with chemometric second-order calibration methods based on Parallel Factor Analysis(PARAFAC) and Self-weighted Alternating Trilinear Decomposition (SWATLD) algorithms. When the component number was chosen to be 2, the average recoveries obtained were (100.3±2.2) % for PARAFAC and (100.1±2.2) % for SWATLD, respectively. The limits of determination for alpinetin were 0.182 3 μg·mL-1 for PARAFAC and 0.178 1 μg·mL-1 for SWATLD. EJCR has demonstrated that the results are accurate.

Abstract:RP-HPLC method was applied for the assay of miconazole nitrate，dexamethasone acetate and paeonol in Mi Song Fen cream after the cream was pretreated with supersonic wave　and ice bath. The linear range of miconazole nitrate was 40.5~648.0 μg/mL and r=0.999 1; the linear range of dexamethasone acetate was 3.05~48.8 μg/mL and r=0.999 8; the linear range of paeonol was 20.5~328.0 μg/mL and r=0.999 4. The mean recovery of miconazole nitrate, dexamethasone acetate and paeonol was 100.44±1.25 (%), 98.46±1.04 (%) and 98.24±1.29 (%), respectively. The present method was successful in removing interference　substance in the cream and getting high recovery of the three drugs mentioned above，which will provide guidance for the quality control of cream.

Abstract:Chemical materials of Fe2O3，MnO2 and Cr2O3 were used to synthesize brown pigments with the conditions of electric heating and microwave heating respectively. The composition and structure of brown pigments and the effect on colouration by different synthesis method were characterized by means of SEM, XRD, and Colorimeter. The results have shown that the temperature needed for microwave heating is 200 ℃ lower than that of electric heating and the synthesis time has been shortened by 1/12.The pigments synthesized by microwave heating present the features of fine, regular and uniform grain and ideal colouration result as well. The stability of porcelain insulator colouration can be increased and the chromatism or other defects can be reduced by using synthesized pigments.

Abstract:The photocatalyst of TiO2/light ceramic was studied. Its proportion was close to water. It could be suspended and dispersed in water to increase its light level and water surface contact area and improve the photocatalytic activity. It could enhance its ability to degrade organic compounds. The results have shown that the photocatalyst of TiO2/light ceramic efficiency of the degradation of Rhodamine-B light is 12% higher than ordinary ceramic. The degradation efficiency of Rhodamine-B can reach 42 % when the heat treatment temperature is 400~450 ℃.

Abstract:Based on the fourth-order anisotropic diffusion LLT model for image denoising, we have proposed a modified fixed point iterative algorithm. The proposed algorithm uses the steepest descent direction as the search direction in order to avoid computing directly the inverse matrices, thus reducing the roundoff error and improving the convergence rate. The convergence of the algorithm has been proved with the spectrum of matrix. Experiment results have illustrated that, for the “Lena” image which is corrupted with the noise of standard variance σ＝15, the signal to noise ratio (SNR) by our algorithm is improved greatly from SNR=11.208 8 to SNR=16.511 1 .

Abstract:Though conjugate gradient methods are easy to be implemented in a computer for solving an unconstrained optimization problem, it is difficult to establish the theory of global convergence. To overcome this difficulty,a new conjugate gradient algorithm was investigated. In this algorithm, the search direction is constructed to be involved with three parameters, which are suitably chosen such that the obtained direction is always sufficiently descent one of the objective function, independent of any line search strategy. On basis of this direction, a nonmonotone conjugate gradient algorithm with three parameters is developed for solving unconstrained optimization problems. Under some mild assumptions, the global convergence theorem of this algorithm is proved. Preliminary numerical experiments demonstrate that the developed algorithm is more effective than the similar algorithms.

Abstract:This paper proposed the notions of LK-closure L-system and LK-interior L-system on L-ordered sets. It has been shown that there exists one-to-one correspondence between LK-closure L-systems (LK-interior L-systems) and LK-closure operators (LK-interior operators).

Abstract:A cascadic multigrid method was applied to solve a kind of semilinear elliptic problems.Under suitable conditions,it has been proved that the algorithm has optimal order of convergence in energy norm and quasi-optimal computational complexity.

Abstract:Based on the perspective of industrial chain, is paper constructed a perspective of steel industry international competitiveness evaluation method to analyze the transition of Chinese steel industry's international competitiveness since 1995. The an alysis indicate sthat, in the sample period, the increasing trend of Chinese steel industry's international competitiveness is obvious. However, the factors diverged in different stage. The international competitiveness of Chinese steel industry is lower than the developed countries, such as Germany, the United States,Italy and Japan, while higher than the developing countries like Brazil and Indonesia; The efficiency of energy using is much lower and its dependence on energy is higher than the developed countries; China and other developing countries' supply capacity of service industry for steel industry is lower than such developed countries as America; The service industry's supply capacity for steel industry is declining and the energy industry's support increased slightly. Finally, the support of China's domestic industry for steel industry converged to the developed countries and the developing countries' construction industry's demand contributesed mostly in all.

Abstract:Using Logistic regression, this article sampled 209 companies involved in fraud and 5436 ones not involved from 2003 to 2007, and checked the corporate governance factors that impact the selection of auditors. The results have shown that the relationship between the proportion of independent directors and the selection of high-quality auditors in fraud companies is inverse U shape and that in samples not involved in fraud the relationship between ownership concentration and the selection of high-quality auditors is inverse U shape. In conclusion, the selection of auditors should be handed to the board of auditors, consisting of independent board members, and in order to guarantee a fine ownership structure, the share reform should continue.