Applied Mechanics and Materials Vols. 48-49

Abstract: In order to improve the load condition of the balls in the returner,a dynamic model for the balls moving through the ball-recycling tunel is established after a analysis on the kinetical geometry bounds for the balls.A program is setup in Matlab,according to the Runge-Kutta formula.And the radius of the ball-recycling tunel track of the returner ,which is being used by Jining Bote , is optimized computed in this program.It is estified that t he improved returner make the friction torq of the ball screw lower and stablizer.

Abstract: a new graph-search algorithm based on multi-attribute decision making (MADM) is proposed. Firstly, A* algorithm is used for graph-search, but when cost functions of two nodes are equal, three attributes describing a node are introduced. Secondly, a multi-attribute decision based on maximum deviation principle is used for nodes evaluation in order to select the best node for expanding. The proposed algorithm could overcome deviation brought by node evaluation based on information theory metrics only, which results in high accuracy. The outcome of simulation verification at the end of this paper manifests that this algorithm has excellent accuracy as the exhaustive algorithm, and is more quickly for large scale computation.

Abstract: From a mathematical model of one kind complicated financial system, we make a dynamic analysis on this kind of system on the basis of studies of scholars both at home and abroad. We find characteristics of various dynamic systems driven by different parameters, and study possible Hopf bifurcation as well as the relationship between Hopf bifurcation and the values of parameters. Besides, we make use of algorithm to analyze complexity of the system. The results of numerical simulation prove that the theory used in the thesis is correct. This study is regarded with good theoretical and practical value.

Abstract: It is an important task for Drug Administration to utilize information technology to strengthen the management of drug sales end, prevent the flow of expired pharmaceuticals into market, and ensure drug safety of consumers. The paper first put forward the three main functions the information monitoring system at drug sales end (IMSDSE) should have, namely, monitoring and early warning for drugs validity, automatic inventory replenishment and recycling of expired drugs. The paper then analyzes the necessity and feasibility of constructing the IMSDSE based on web service, and the structure and working principle of the web-service –based system. Finally, the paper describes the overall design of IMSDSE from technical perspective.

Abstract: A new dual-objective scheduling method based on the controlled Petri net and GA is proposed to the job-shop scheduling problem (JSP) with urgent orders constrained by machines, workers. Firstly, a controller designed method for Petri net with uncontrollable transition is introduced, and based on the method, the Petri net model is constructed for urgent jobs in flexible job shop scheduling problem. Then, the genetic algorithm (GA) is applied based on the controlled Petri net model and Pareto. Function objectives of the proposed method are to minimize the completion time and the total expense of machines and workers. Finally, Scheduling example is employed to illustrate the effectiveness of the method.

Abstract: HZSM-5 zeolite was prepared by treating of NaZSM-5 with phosphoric acid and used as support for TiO2 prepared by sol-gel method. Adsorption and photocatalytic activity of the zeolite, adsorption ability of the loaded TiO2, and the optimum TiO2 loading amount were studied. The maximum methyl orange adsorption rate was less than 1% in the range of HZSM-5 dosage from 0.01 g up to 0.07 g. After 30 min of irradiation, the photocatalytic activity of HZSM-5 under UV irradiation was only between 1.5% and 2.7%. Methyl orange reached its adsorption equilibrium after 20 min under stirring. Total adsorption on the supported material was less than 2% after adsorption equilibrium. The TiO2 loaded on HZSM-5 treated with 0.2 mol/l phosphoric acid presented the optimum activity. The TiO2/HZSM-5 photocatalyst loaded on HZSM-5 treated with 0.2 mol/l aqueous H3PO4 solution could remove 93% of the initial methyl orange after 2 h.

Abstract: Hydraulic thrust system is a critical part of shield tunneling machine. The precise control of the thrust force is a significant task of thrust system during tunneling excavation. In this paper, an operation principle of the hydraulic thrust system test rig is illustrated. Taking into account the variable deadband nonlinear characteristics of proportional relief valve which is used for regulating the thrust pressure, several compensation control strategies are adopted to achieve the precise control of thrust force. Analysis and comparison which bases on simulation and experiment is done at last. The result shows that Fuzzy control can both eliminate the error and reduce the adjustment time which can basically meet the requirement of practical tunnel excavation.

Abstract: This paper presents a new predictive artificial potential field approach for robot soccer path planning under complex and uncertain environment. By predicting and analyzing the future position and attitude of concerned object, the position and attitude of the object is controlled by demonstration algorithm. The proposed method is successfully used in the robor soccer shooting and is realized on the MiroSot 3vs3 simulating platform. Experiment results show that this algorithm has good real-time ability and adaptability to environment.

Abstract: Steel slag is a industry solid waste which come from steel making factory，and is easy to solid-liquid separation, so it posses some adsorption capacities and can be used as adsorbent. Adsorption phenol onto steel slag was investigated by the oscillating adsorption experiments and the effect of different operating parameters on these adsorption processes, such as initial concentration phenol and the pH value were studied. The surface characterization were gained by SEM, X-ray diffraction, IR Spectroscopy and BET.

Abstract: Silicon compounds as reinforcement agents in wood modification have an increase improvement in durability, dimension-stability and photostability, fire resistance, and certain mechanical properties such as surface hardness, tensile strength. Two kinds of silicon compounds reinforced poplar wood composites were fabrication by sol-gel and dipping silicasol respectively. The thermal properties of these materials were conducted by TG, and thermokinetic models and equations in process of pyrolysis were established by Doyle calculation. Results show that wood based composites with improved fire resistance were well fabricated, and temperature scopes of thermal pyrolysis of these composites were decreased from 420 °Cto 380°C compared with poplar wood, but activation energies increased from 322.8 kJ•mol-1 to 421.1 kJ•mol-1. Wood substrate was protected for introduction of silinon compounds in certain degree.