Journal of Hefei University of Technology 

About: Journal of Hefei University of Technology is an academic journal. The journal publishes majorly in the area(s): Software & Finite element method. Over the lifetime, 1151 publications have been published receiving 2055 citations.

On the superharmonic resonance problems

Abstract: In this paper,the problems of superharmonic resonance of time-delay systems are studied.The famous method of multiple scales is successfully extended to the time-delay systems,which provides great convenience for the study of the systems with time lag.As to the complex forced oscillation problem of a class of time-delay systems with damping and general force, a uniformly valid asymptotic expansion is obtained according to the distinct circumstance of superharmonic resonance,and an approximate analytic formula which is very simple and explicit is also given.By using the formula,the approximate analytic solutions for a great number of resonance problems of timedelay oscillation systems,especially the amplitude,frequency,period and phase can be got conveniently.The conclusions of related literature become simple corollaries of the paper.

Several methods of wavelet denoising

Abstract: Using wavelet denoising is an important application of wavelet analysis in engineering.Several popular wavelet denoising methods are introduced herein including the wavelet decomposition and reconstruction method,the nonlinear wavelet threshold denoising method, the translation invariant denoising method and the wavelet transform modulus maxima method.These methods are used to remove the Gaussian white noise from the simulated signal respectively.Their advantages and disadvantages are compared, which may be helpful in selecting the methods of wavelet denoising.

Advance and trend analysis of theoretical methodology for water quality forecast

Abstract: According to the different theories on which water quality forecast models are based,the theoretical methodology for predicting the variation trend of water quality can be summarized in such kinds of styles as follows: the forecast method based on the mathematical statistics theory,the method based on the grey system theory,the method based on the artificial neural network,the method based on water quality simulation and that based on the chaos theoryThe development trend of theoretical methodology for water quality forecast is analyzed simply

Chloride ion permeability test and analysis for recycled concrete

Abstract: The corrosion of rebars in concrete structure is mostly produced by chloride ion permeability.A rapid testing method called RCM for determining chloride ion permeability is used in this paper.The effects of recycled aggregate,W/C and sand ratio on chloride ion permeability of recycled concrete are analyzed.Test results indicate that the chloride ion permeability of normal concrete is better than that of recycled concrete and the resistance to chloride ion permeability increases with the decreasing of W/C.

Research on the kinetics of alumina from kaolinite leaching in sulphuric acid

Abstract: In this paper, the reaction kinetics of alumina from kaolinite leaching in sulphuric acid is studied, while the feed stocks are kaolinite and sulphuric acid. According to shrinking core model, the model equation to be controlled by chemical reaction is deduced and the conditions of its steps are determined. Under the condition to be controlled by chemical reaction, the experiment is made and its result demonstrates that the reaction process is in accordance with shrinking core model. The reaction order and reaction activation energy are determined and the reaction kinetics equation is set up.