Search

Through using a system dynamics approach, this research establishes a prediction model of Dalian Port cargo throughput and makes a thorough inquiry in the influence of distinct factors of economy and the port. The prediction model solves the deviation problem resulted from rare factors and uncertainty of economy and society level with the average relative error of 3%. In order to improve the effect of Dalian Port in the whole Northeast Economic Circle, several suggestions are given by analysis of the simulation results.

Based on the analysis of the loads, constraints and its mechanisms applying to the duct system, a finite element model of the anti-ice system is developed and the Lanczos algorithm is used for modal analysis. Then, the first eight natural frequencies and vibration modes are obtained. The thermodynamic parameters of the gas and the kinetic parameters of the ball joint which have influence on the modal analysis are considered. The results show that the first eight order natural frequencies of the anti-ice Part1 are low and concentrated, and decrease with temperature of the gas while increase with pressure of the gas. Meanwhile, the natural frequencies increase with the stiffness and starting torque of the ball joint. This work could be helpful for reliability design of civil-aircraft ducting system.

Three curcumin analogues were synthesized from 4-chlorobenzaldehyde and cyclohexanone，cyclopentane and aceton，and their spectroscopic properties were determined. The synthetics had the structural properties such as the target compounds，which showed their particular spectroscopic properties．

A study has been conducted on the preparation conditions of Al2O3 for the catalysts for diesel particulate matter. The results show that the preparation conditions of Al2O3 support had great contribution to performance of Sn-Cu-K-V/Zr02-Al2O3 catalyst. The conditions of precipitant, pH value and calcination temperature were investigated. The experiment results show that the suitable precipitant was Na2CO3, the pH value of the solution was 9 and calcination temperature was 1000°C. The catalyst which active components were loaded on the modified support by immersion method showed better catalytic activity.

In this paper, (2E,6E)-2,6-Bis(2,3,4-tri-methoxy -benzylidene)cyclohexanone (omitted as tmbcho) (1) was obtained by the reaction of acetic acid, tetrahydrofuran, cyclohexanone and 2,3,4-tri-methoxy-benzaldehyde. Three non-classic hydrogen bonds were observed in the compound. X-ray crystallography shows that the crystal structure is stabilized by intermolecular C-H•••π interactions and it contains plenty of conjugated double bonds. The title compound was characterized by UV-vis and fluorescent spectral studies.