Abstract:The purpose of this study is to save materials by optimizing the related poles. In this study, the plane and space truss's rod sizes were taken as the design parameters, displacement and stress as the constraints. Uniform Design Method was adopted to approximately optimize a heliostat under wind load, and then approximation functions between objective (displacement, stress and consumption of steel) and parameters were obtained. Finally, this study gave the rod specifications under different conditions. Compared with the existing structure, the optimized structure saves 13.8% of steel. This whole process is simple and reliable.

Abstract:In order to overcome fatigue crack and early damages in steel bridge decks, a composite deck paving system, consisting of steel plate and thin Reactive Powder Concrete (RPC) , was presented. The calculation on the local finite element model of composite deck paving system indicated that the maximum tensile stress, shearing strain, and vertical displacement decreased by up to 54.8%, 78.9% and 39.1% respectively, compared with flexible pavement. Laboratory experiments, i.e. interlayer shearing test and tensile fatigue test, showed that the shearing strength of the interface between RPC and asphalt wearing layer was 1.3MPa at the high temperature of 60℃, bearing capacity of the shear connector was 66.75kN, and no crack appeared in cantilever beam under two millions of repetitions loads ( stress amplitude from 7.5MPa to 14.5MPa). It was found that the thin composite deck paving system can effectively reduce stress (strain) amplitude and local vertical deformation. Meanwhile, the shear strengths of interlayer were enough to resist the stresses in unfavorable conditions.

Abstract:A new method for the study of lateral dynamic interaction factors was presented by considering the participation of axial loads on pile-head in layered-soil in order to further extend the applications of the simplified S-R model in engineering practice. By means of substructure theory, the dynamic response of pile-groups-structure characterized by random configuration, pile number, soil properties, etc., can be fulfilled with less cost-time than other numerical methods. With the computation for a bridge-pier base suffering earthquake action, it is indicated that additional displacement will engender the effect of vertical oscillation, which results in the decrease of horizontal impedance effect of pile-groups, and the influence of pile-soil-pile interaction is markedly enhanced over that under single horizontal vibration. In general, the horizontal dynamic response of a whole system will be reduced due to the relative flexible participation of pile-soil subsystems.

Abstract:In order to investigate the stability of piles under dynamic loads, an indoor model test was designed, in which homogeneous fine sand was used to simulate the subsoil around the pile shaft with various diameters, embedded ratios and boundary conditions at the top and the toe. Then, simple harmonic loads with different vibration amplitudes and frequencies were exerted at the pile top, and the corresponding dynamic responses of the pile shaft and subsoil (including dynamic stress and strain, etc) were measured with the sensors instrumented among the pile-soil system. Based on the test data obtained, a comparative analysis was made to discuss the dynamic influencing rules of various parameters (such as the diameter and embedded ratio of pile shaft, the frequency and magnitude of dynamic load, etc) on the pile top displacement. Furthermore, the parametric resonance phenomenon of the pile was observed and verified in the test. And the difference between the smaller frequencies measured and the theoretical values may be improved by a coefficient of k ranging from 0.5 to 0.8, which decreases with the increase of the dynamic load amplitude and the depth of subsoil.

Abstract:Based on the risk identification of dewatering and factor assessment, an emergency warning system was introduced into Metro Line No.4 reconstruction. The purpose and method of emergency warning were established. The impacts on the surrounding environment such as land subsidence and foundation pit deformation were analyzed and quantified in the design of the dewatering project, construction and operation. The risk level was evaluated, the emergency warning system was established, and the measurements of risks were proposed.

Abstract:For the need of reference data in the process of a new car model development, the vehicle structure fatigue loading spectrum acquisition and analysis technique with customer correlation was used, so four-wheel six-component sensors, acceleration sensors and strain sensors were used to collect the loading spectrum in Hainan testing ground and surrounding road. Then, the statistical analysis of the part of the left and right rear wheels six-component signal in time domain, frequency domain, and rain basin were presented, respectively. The results showed that the statistical properties of maximum and the pseudo-damage value of left rear axle head were similar to the right one in the same directions. The natural frequencics of rear suspension and tire were about 1.6 Hz and 12 Hz respectively, and the pseudo- damage of structure fatigue due to vertical force was 0.000 565.

Abstract:Aiming at improving the performance of clamping force control of metal V-belt Continuously Variable Transmission (CVT), such as metal belt abrasion and low efficiency, a clamping force fuzzy-PID controller model was established. Considering the defect of fuzzy-PID controller, such as subjective, rough and imperfect, genetic algorithm was applied to off-line optimize both membership function and fuzzy rules. At last, road tests were done to verify the performance of the optimized fuzzy-PID controller. The test results have shown that the improved fuzzy-PID controller has a satisfactory effect on the clamping force control with better tracing precision and less steady state error. Additionally, the CVT's fuel economy was enhanced by reducing the safety factor of clamping force from 1.3 down to 1.24 on the basis of control precision.

Abstract:To meet the requirement of industrial online monitoring on the stability, real-time performance, accuracy and interference resistance of computer vision algorithms, in light of the specific circumstances of the real-time monitoring system for five-degrees-of-freedom of the moving parts of the 200MN extruder, a fast and precise location method of the laser beam center point in complex industrial environment was proposed on the basis of the existing methodologies. First, the Canny algorithm was employed to realize the binary conversion of the edge of preprocessed image, and those, among the resulting edges, unsuitable for spot file were screened out. Then, an improved fast Hough algorithm for conversion was applied to preliminarily identify the approximate location and radius, and the spot effective area was set according to the Hough conversion results. At last, the coordinates of laser beam center point of sub-pixel precision were obtained by fitting the least square ellipse in the effective area. The experimental study indicated that, in a jamming environment, it took less than 50 ms for single time detection with the precision of up to 0.15 pixels. This method can realize the high-precision location of the laser beam center point under strong jamming, and, compared with traditional methods, it is featured by better precision, real-time performance and adaptability.

Abstract:The location precision by binocular camera sensitive to environment is not high, thus the grasping success rate and robustness are not sound in the existing grasping system. And in order to overcome this problem, this paper proposed a method of fusing vision of infrared sensors, tactile sensors and encoders, which can realize a reliable, robust system capable of adjusting grip force automatically. In order to avoid the situation of grasping-nothing, binocular camera coupled with monocular camera and infrared sensors were used to locate precisely. By integrating tactile sensors and encoders, and adding monitoring force and position information in the process of grasping, the phenomena of broken and slippage of the object were reduced to a great extent. The experiments demonstrate that the grasping success rate and the system performance are greatly improved by fusing multi-sensor data compared with signal sensor.

Abstract:As generative parameter learning method uses the maximum likelihood as the target，its classification accuracy is low. So, we proposed an efficient discriminative parameter learning algorithm, which uses the classification accuracy as the target. It learns parameters by discriminatively computing the frequencies of parameters from data set. Empirical studies show that this algorithm integrates the advantages of both generative and discriminative learning and it performs as well as the state-of-art classification method SMV, but is significantly more efficient. At last, this method is used in the problem to identify oil and water layers. The accuracy of the conclusion has very important value for oil field development and production.

Abstract:According to the normalizationof power grid ice disaster protection, in order to enhance disaster prevention technology and economy of unit, from power grid ice melting technology combines the TOPSIS theory to construct the decision model, and by using the IDSS theory ,the ice melting power system model IDSS which is based on TOPSIS algorithm is proposed. By using the model that is proposed in this article, the calculated results based on TOPSIS to determine the first ice-melting operating area. Finally, through the empirical analysis, verified the validity of the model of decision support system, realized ice-melting decision optimization.

Abstract:Birch wood chips were treated in ultrasonic-assisted ball milling hydrolysis with dilute citric acid at room temperature and atmospheric pressure in order to develop an efficient conversion process for the production of fermentable sugars from woody biomasses using wet ball milling hydrolysis system. Wood lignocellulose was easily hydrolyzed during ballmilling treatment into reduced sugars with a total yield of 130 mg/g wood. The concentrations of several major substances in the hydrolyzate were discussed. Corresponding structure transformations before and after milling were analyzed by means of X-ray diffraction (XRD), and UV spectroscopy clearly indicated that this combined treatment could enhance the crystalline and chemical structure changes of wood lignocellulose during ball-milling.

Abstract:The effect of Eu3+ ions concentration on the optical properties of TeO2-BaO-Eu2O3 glass was studied. The absorption intensity of the charge-transfer band was observed as a function of Eu3+ ions concentration. The absorption intensity relative to that of the host increased with the increase of the Eu3+ ions concentration. The strong emission peaks lied in 594 and 615 nm under 394 nm excitation for all the samples. The emission intensity of 5D0→ 7F2 transition changed with Eu3+ ion concentration with respect to that of 5D0→ 7F1 transition. Phonon sidebands were related to the doped concentration of the samples.

Abstract:Aiming at the case of two jamming sources, a new method of main-lobe jamming suppression and target angle parameter estimation was presented for missile-borne mono-pulse high-repetition stepped-frequency radar application. In this method, beam-forming in modified azimuth-elevation coordinate system was done in order to obtain separable pattern function; eight channels, including sum, azimuth-difference, elevation-difference and other auxiliary channels, were constructed by the use of digital processing of sub-array output signals; and modified sum channels and modified difference channels were formed by using multi-channel cancellation technology. This method can suppress main-lobe jamming and meanwhile preserve undistorted mono-pulse ratio. Theoretical analysis and simulation results have proved its effectiveness.

Abstract:In order to overcome the unsatisfactory segmenting results such as over-segmentation, under-segmentation and touched region with holes in particle image, an improved segmenting algorithm was presented. Based on the boundary tracing segmenting algorithm, the proposed algorithm controls the segmenting process with the local maximum value point information of the true Euclidean distance to decrease the occurrence of over-segmentation and under-segmentation. And for the touched region with holes, the inner boundary was traced also, while the outer boundary was traced. The experiment result shows that this algorithm has acquired better segmenting effect.

Abstract:This paper studied the pricing problem of European option under an incomplete market on the basis of consumption utility indifference. The conclusions of Black-Scholes models were recovered even for a general utility function. In contrast to complete markets, it is found that the utility indifference price for CARA utility may decrease if the volatility of the underlying asset or the lifetime of the option increases under the incomplete market. The risk attitude of an investor has effects on option prices only if there is idiosyncratic risk exposed in the option. The smaller the idiosyncratic risk exposed in the option, the weaker the effect of the risk attitude on the consumption utility indifference price. Especially, if there is no idiosyncratic risk exposed in the option, the risk attitude will make no impact on option prices.

Abstract:A time-varying multiple Copula model was constructed, and the Monte Carlo simulation technology was used to calculate VaR (Value at Risk) in order to accurately measure the risk resulting from the four exchange rates: CNY/USD, CNY/EUR, CNY/JPY and CNY/HKD of commercial Banks. Then, a comparative analysis was made on the measurement effect between the static multiple Copula-VaR and the time-varying multiple Copula-VaR. The results show that the connections between these exchange rates are indeed time-varying related, and the measurement effect of the time-varying multiple Copula-VaR is much better.

Abstract:A new multiplicative subspace correction method was proposed for nonlinear unconstrained convex optimization problems based on MG/OPT and PSCA, and its convergence and convergence rate were analyzed.

Abstract:Assuming that D is a 5-(v,k,2) design, G is an automorphism group of D, and the socle of G,Soc(G)=PSL(2, 2n)， and by using the orbits of PSL(2,q)acting on the project lines, it is proven that G can not flag-transitively act on a non-trivial 5-(v,k,2) designs, which is a part rusult of the classification problem of flag-transitive t-designs.