Applied Mechanics and Materials Vols. 48-49

Abstract: This paper introduces design principles and steps of a bootloader, including the analysis of S3C2440A microprocess with its peripherals, hardware initialization process and the automatic loading mode and the steps of Shell command interpreter, and gives parts of the core codes and the experi- mental results.

Abstract: This paper presents the generation of monoclonal antibodies (mAbs) with high specificity against enrofloxacin (ENR) through cell fusion procedures, and the development of a mAb-based indirect competitive ELISA (icELISA) method to detect ENR residue using one of these Hybridomas (clone 4B5-D6). Under the optimal experimental conditions, this assay exhibited a working range of 0.004-38 ng/mL with IC50 and LOD values of 0.4 and 0.002 ng/mL, respectively. Except for a high cross-reactivity (105.2%) to Ciprofloxacin, negligible cross-reactivity to the other compounds was observed. After optimization, 10% of methanol was used in the assay buffer and this ELISA system can tolerate acetonitrile not higher than 10%. Recovery studies indicate that an excellent correlation between concentration spiked and concentration determined was found, and the results also suggest this assay has the potential to be incorporated into a quantitative monitoring program for the rapid screening of ENR residue in poultry tissues.

Abstract: Good performance of driving power supply is the key to achieve high-precision positioning of the piezoelectric ceramic. In this paper, mainly from the expansion of power channel, lower ripple and interference, reducing the volume and temperature control of amplifier such aspects, developed PZT multi-channel power supply based on PA93 power amplifier, and completed the corresponding experiments of the calibration characteristics. By testing, the output voltage of eight channels shows good linearity, the nonlinear error is less than 0.05％. the resolution is 6mv, the static ripple voltage is less than 9mV, the power bandwidth could be 5kHz, the continuous output current could be 1.5A, the voltage variation is less than 0.01％ after eight hours continuous working. The volume of power supply is only 280*260*120mm, the power supply could satisfy the requirements of PZT driving.

Abstract: Electric ancillary service is an important method that ensures the power system to operate safely and stably. This paper discusses the optimum selection of Automatic Generation Control (AGC) units in the Electric AGC Ancillary Service Market. In this paper a mathematical model is proposed to select the generating unit to perform AGC function in light of minimizing the AGC services purchase fee. Several forms that are used to pay the AGC service business are also discussed in the paper. The application to a realistic system shows that the idea and the method presented in this paper are correct and feasible.

Abstract: The problem of delay-dependent dissipative control for nonlinear neutral delay systems is dealt with. We develop the design method of dissipative static state feedback controller such that the closed-loop system is absolutely stable and strictly-dissipative. Sufficient conditions for the existence of the quadratic dissipative controller are obtained by using linear Matrix Inequality(LMI) approach. Furthermore, a procedure of constructing such a controller from the solution of LMI is given. It is shown that the solvability of a dissipative controller design is implied by the feasibility of LMIs.

Abstract: Prestressed concrete material structures have the properties of higher crack resistance, higher degree of solidity and lighter weight. A new analytical method is proposed to investigate the dynamic deflection responses of the partially prestressed concrete beams subjected to blast loads. The new method uses an equivalent single degree of freedom system, which combines an elasto/viscoplastic rate-sensitive material model with the proposed static layered section approach. The analytical results agree well with the test data.

Abstract: Machining slender workpiece is still a technical difficulty. This paper investigates the dynamic behavior of a slender shaft subject to constant feedrate moving cutting forces in twin-spindle turning process. The Euler-Bernoulli theory is used to model the rotating shaft. A dynamic cutting force model is formulated considering the flexibility of workpiece and rigid machine tool. The modal analysis method is employed to solve the dynamic response of the shaft. The parametric influence to the response and natural frequencies of shaft is discussed. Finally, the results are presented and compared between constant cutting forces and deflection-dependent force model introduced in this paper. It is found that there exists a stiffening effect due to the cutting process.

Abstract: The connection of the engine body and the base was simplified as a spring and a damper to analyze the body vibration of the single piston hydraulic free piston engine. It was demonstrated that the increasing of the connection spring rate can reduce the amplitude of the body vibration. But the reduced vibration amplitude was trivial after the spring rate was increased above 300KN/m. The damp ratio of the connection had little influence on the body vibration. The introduction of a pump chamber into the structure in the compression stroke can shorten the rebounding displacement of the free piston assembly (FPA) while it was settled at the right dead center working in pulse pause modulation (PPM) mode. Furthermore it can keep the FPA have an enough stroke to achieve a predetermined compression ratio and reduce the fluctuation of the pump flow. The compression ratio can be improved through increasing the pressure of the compression accumulator and decreasing the pressure of the high pressure accumulator. Also the compression ratio and the operation frequency of the engine can be improved by shortening the switch time of the control valve and prolonging the open time.

Abstract: Based on frequency domain method, the seismic responses of the superstructure-pile foundation-soil system are studied taking the dynamic soil-structure interaction into consideration. For analyzing the earthquake response of cylindrical pile foundation, earthquake response analysis of three-dimensional system of pile foundation-soil-superstructure simplify two-dimensional question. The dynamic responses of the interaction system under EI-Centro ground motion excitation are evaluated by using secondary development of the large general finite analysis software Abaqus. It is shown that pile foundation is more anti-seismic and that pile foundation flexibility can improve the structural basic cycle. Based on a comprehensive assessment theory, soil-superstructure interaction problem under Earthquake is analyzed by second-level evaluation of comprehensive evaluation. By applying comprehensive evaluation method fuzzy theory model of soil-superstructure interaction is built. It is show that fuzzy mathematics method is appropriate for this kind of soil-superstructure interaction problem.

Abstract: This paper presents a game model to analyze the dynamic negotiation process of bilateral contracts in electricity market. This model focuses on the bilateral contracts with a fixed amount of electricity and incomplete information. Equilibriums show that increasing the price transparency of spot markets will facilitate electricity trading though bilateral contracts, and enhance the efficiency of the entire electricity market.