Abstract:In order to discuss the calculating methods of short term rigidity and bending deflection, ten precast prestressed concrete ribbed panels(PPCRP) with rectangular rib and two PPCRP with T-shaped rib were tested, and the load-deflection curves were obtained. The general formula of bending deflection taking into account the distribution of preformed holes in the rib and equivalent rigidity formula for PPCRP were deduced. The contrast analysis of load-deflection curves obtained from equivalent rigidity formula and test result show that short term rigidity of simply supported PPCRP under uniformly distributed load can be calculated at 0.85 times as equivalent rigidity.

Abstract:Based on the analysis of bearing capacity calculation method of the CFG-piles composite foundation, according to the interval and fuzzy characteristics of its influence factors, triangular fuzzy numbers were used to express the calculating parameters, and then the fuzzy analysis model of bearing capacity calculation of CFG-piles composite foundation was presented. Triangular fuzzy parameters of bearing capacity of CFG-piles composite foundation were proposed by discussing the method to determine triangular fuzzy numbers. And then, based on the given safety factors and the bearing capacity design method to get performance functions, the level-sets technique and interval number algorithm were introduced to establish the fuzzy possibilistic reliability analysis method for bearing capacity of CFG-piles composite foundation.

Abstract:A detailed test of the wind pressure distribution of a tall residential building was carried out in a Boundary Layer Wind Tunnel. The wind pressure distributions on the building were investigated. The results have shown that the correlations of wind pressures on the concave surface are very high at the same height. For the design of the double cantilevered roof, the upper is controlled by negative wind pressure and the lower by positive wind pressure. The glass tailgate at the top of the building is also controlled by positive wind pressure. The wind pressure distributions of the building are changed more noticeably if the surrounding buildings and topography exist. Especially under the height of the disruptors, the change of fluctuating wind pressure is significant. The min peak wind pressure has an increase of 28% when the building is disturbed.

Abstract:Through the experiments of 12 (6 half-grouted and 6 full-grouted) compressive specimens, the failure pattern and the ultimate capacity of concrete block masonry were analyzed. Test results showed that the compressive strength and the elastic modulus of two ends opened block masonry were enhanced compared to the common concrete block masonry (like K-block). Based on the compression mechanism of two ends opened block masonry, a semi-empirical theory formula was presented for grouted two ends opened block masonry. And the calculation results with the formulas were in good agreement with the test results. 

Abstract:By utilizing the fuzzy analytic hierarchy process and considering the mutual influence of the influencing factors on the trapping mechanism of diesel particulate filter, a complex interconnected evaluation system was decomposed into several independent hierarchical systems, and a comprehensive evaluation model of the trapping mechanism of diesel particulate filter was established. The results showed that the wall thickness, the porosity and the pore aperture were the most remarkable influencing factors to the main trapping mechanism. While the hole density, the diameter and the length were the secondary influence factors to the main trapping mechanism. The factor of porosity was overwhelmingly dominant to the diffusion mechanism, accounting for nearly 60% influence proportion; the pore aperture was the most important factor to the inertia collision mechanism, accounting for nearly 39% influence proportion; and furthermore, the porosity and the pore aperture were the equally important influencing factors to the intercept mechanism, the two accounting for 60% influence proportion.

Abstract:To solve the problems existing in numerical control machining processes for difficult processed metal materials, such as titanium alloy, a control method of numerical control machining processes for difficult processed metal materials based on RBF neural network was developed. And combined with CNC machining equipment, the corresponding real-time monitoring system was established. Application effect shows that, through RBF neural network control of numerical control machining processes, the surface roughness and roundness errors of workpiece are much lower than those machined in conventional machining methods. The average error of surface roughness reduced more than 50%, while the average error of roundness reduced more than 70%.

Abstract:Fouling coefficient is an important measure parameter of condenser performance, but it is affected by multi-factors, therefore judging the condenser water side of tube walls fouling based on coefficient would have a significant error. So this paper proposed the concept of degree of cleanliness, which allows us to analyze the influence of the air accumulated on the steam side、the fouling on condenser water side of tube walls、and the tube bundle coefficient of condenser on the overall heat transfer coefficient of the condenser respectively. It can diagnose the condenser fouling more accurately and provide a basis for scheduling reasonable cleaning. Experimental results show the method can be more reliable than the T-S fuzzy model, thermal resistance method, RBF neural network model when the condenser pipe blockage or a larger amount of air leakage into the condenser or condenser operating mode parameters change rapidly.

Abstract:Based on wavelet transform (WT), Fourier transform (FT) and neural network, a new fault diagnosis method of analog circuits was proposed. The proposed method uses wavelet transform (WT) and Fourier transform (FT) for fault feature extraction when the analog circuits are under different faulty situations. That is, we use WT to filter the disturbance influences (for example, noises) on the original signals to prevent the unrelated energies from being mixed with the effective signals. These signals are then analyzed by FT to obtain the frequency spectrum of the effective signals. And then, the energies of these signals are extracted and preprocessed by principal component analysis (PCA) and normalization as fault features. Meanwhile, considering that the probability neural networks (PNNs) have characteristics of simple structures, high-speed of training process and easy append training samples, we use this kind of neural networks for fault location. The diagnosis principles and procedures were outlined, And the satisfied diagnosis resolution and accuracies have been achieved by using the proposed method.

Abstract:In the reliability evaluation of engineering, Markov method has limitations in the life distribution of the sustems elements, while Monte-carlo method has limitation in simulation results with random defects. The uncertainty of the life distribution of the system’s elements affects the validity and accuracy of the reliability evaluation. Reliability assessments were applied in FYXF-03 dynamotor prime mover simulation system by using method of repairable systems under maintenance after failure (Rss) and Weibull model. The results are precise in this method. A useful reference is provided for making plans for equipment repair and maintenance as well as the selection of components.

Abstract:A polyurethane polyol dispersions of two-package waterborne polyurethane have been successfully synthesized with diethanolamine (DEA) as the blocking agent for introducing hydroxy-terminated on to the end-NCO polyurethane prepolymers, which were prepared beforehand with isophorone diisocyanate (IPDI), polyether binary alcohol (N210), dimethylol propionic acid (DMPA), and trimethylolpropane(TMP) as the main raw materials. The properties of the dispersions and films such as gloss, hardness, solvent resistance, water resistance were significantly affected by the amount of DMPA, TMP, hydroxy contents and the ratio of dispersions to curing agents. The optimum performance was obtained with the content of DMPA, TMP and DEA reaching 6%～6.5%, 3%～5% and 7.61% respectively, and the ratio of curing agents to dispersions being 1.5～1.7. Furthermore, the synthetic process of the polyol dispersions and the 2K-WPU films were characterized by multiple devices such as FTIR and SEM.

Abstract:Carboxymethyl chitosan/Cu composite, carboxymethyl chitosan/Ag composite and chitosan/polyaniline/Pd composite modified electrodes were prepared through in situ electrodeposition. The resultant metal particles were uniformly dispersed in the polymer films. The three electrodes showed good analytic performances to H2O2 with the linear H2O2 concentration ranges of1.0mol/L~10.0mmol/L,10mol/L~6.0mmol/L,10mol /L~7.0 mmol/L, the related coefficients corresponding to 0.999 7, 0.999 9 and 0.999 8, the sensitivities corresponding to 33, 37 and 46 μA·L·mmol -1 ·cm -2 , and the detection limits corresponding to 1 μmol/L, 1 nmol/L and 1 μmol/L, respectively.

Abstract:In order to study the growth of Penicillium simplicissimum exposed to phenols and anilines, and the degradation of these toxic substances, several different concentrations of phenols and anilines were added to the culture system, which was cultured for 4 days with -Penicillium simplicissimum.- The results have shown that low concentrations of phenols and anilines can promote the growth of Penicillium simplicissimum, But on the contrary, the growth would be restrained under the culture of high concentrations. Meanwhile, Penicillium simplicissimum can catalyze and oxidize phenol, 2,4-dichlorophenol and aniline effectively. When the concentration of phenol was controlled at 500 μg/mL, 2,4-dichlorophenol was 50 μg/mL, and aniline was 1 000 μg/mL, the degradation rates of phenol, 2,4-dichlorophenol and aniline were all close to 100%. When the concentration of 2,4-dichlorophenol was controlled at 60~125 μg/mL and aniline was 2 000~5 000 μg/mL, the degradation rates were over 60% and 70%, respectively. However, the degradation effect of p-nitrophenol and p-nitroaniline by Penicillium simplicissimum was worse, and their degradation rate was only about 10%.

Abstract:A shell-tube sewage heat exchanger with auto-de-fouling function was first developed, followed by the modeling of its distributed model for the dry-type shell-tube sewage evaporator according to the theory of two-phase flow and thermodynamics of refrigeration systems. Then the model was solved by combining iterating two-side fluids with unidirectional solving of single-side flow. By comparing the simulation results with the experiment data, the accuracy of the simulation program was proved. The results have shown that the maximum refrigerant pressure drop in the evaporator is 0.34 kPa.

Abstract:A major assumption in many machine learning algorithms is that the training data and testing data have the same distribution. However, in many real-world applications, this assumption may not hold. Transfer learning addresses this problem and utilizes plenty of labeded data in a source domain to solve related but different problems in a target domain. This paper proposed a parameter- transfer learning method based on KMM (Kernel Mean Matching) algorithm. First, we weighed each source instance using KMM and then applied the reweighted instances to the learning method based on parameters. We applied this method to the localization of wireless network. Experiment results have demonstrated that the proposed method outperforms the methods based on instances or parameters, especially when the target training data are relatively few.

Abstract:A new robust watermarking based on DCT domain was proposed. The algorithm takes full advantage of the local correlation of the host image pixels and the masking characteristics of the human visual system. It chose DCT blocks by comparing the value of the DCT low frequency coefficients and the amount of the nonzero DCT coefficients of each block. After the embedding process was completed, the transformation of the DCT coefficients from the frequency domain to the spatial domain produces some rounding errors, because the conversion of real numbers to integers would cause some information loss. This paper used genetic algorithm to deal with the rounding errors. The experimental results have shown that the algorithm can not only ensure the quality of the embedded image and the invisibility of the watermark, but also give robust to common image operation.

Abstract:A three-hierarchy supply chain coordination model under the fuzzy demand environment was set up by means of bi-level programming. The supply chain system consisted of multiple suppliers, one manufacturer and multiple retailers. According to the internal form of the model’s constraints, Chaos Search algorithm was applied to solve the model and an example was cited to verify the feasibility of the model. The numerical results have shown that the core enterprise manufacturer can coordinate the interests among the supply chain members by applying the strategy of coordination development with its suppliers and price discount with its retailers, thus, realizing the Pareto improvement. And the research can provide a basis for the supply chain decision-makers under the fuzzy demand environment.