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1

Controlled-release urea encapsulated by ethyl cellulose/butyl acrylate/vinyl acetate hybrid latex

Li Y., Zhen D., Liao S., Zhu D., Yang X.

Polish Journal of Chemical Technology

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2018

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Vol. 20, nr 4

108--112

EN

Fertilizer encapsulation through polymer membranes can reduce fertilizer losses and minimize environmental pollution. In this paper, an emulsion of ethyl cellulose (EC)/vinyl acetate (VAc)/butyl acrylate (BA) was successfully prepared by pre-emulsified semi-continuous seed emulsion polymerization. EC/BA/VAc films showed biodegradability. The influence of the EC content on the properties of EC/BA/VAc films was also investigated by DSC, a water absorbency analysis, etc. Controlled-release urea encapsulated by EC/BA/VAc latex was prepared in a film coating machine and conformed to the standards for slow-release fertilizers of the Committee of European Normalization. The release of urea from controlled-release urea encapsulated by EC/BA/VAc latex containing 0%, 5%, 10%, and 15% EC was 75.1%, 65.8%, 70.1% and 84.1%, respectively, after 42 days, and controlled-release urea encapsulated by EC/BA/VAc latex (5% EC) had the best controlled-release ability. Therefore, controlled-release urea encapsulated by EC/BA/VAc latex has many potential applications in agricultural industry.

2

Color image reconstruction from Charlier moments

Zhang X., Liao S.

Journal of Theoretical and Applied Computer Science

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2015

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Vol. 9, nr 2

3--13

EN

In this research, we conducted a study on Charlier polynomials and discrete orthogonal Charlier moments. With the three channel method, we have carried out the color image reconstructions from Charlier moments with satisfied results. Our experimental results show that the color images can be precisely reconstructed in each of three primary color channels individually. We conclude that the moment methods developed for gray-level images can be applied in color image analysis.

3

Color image analysis via Racah moments

Wu Y., Liao S.

Journal of Theoretical and Applied Computer Science

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2015

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Vol. 9, nr 4

8--18

EN

In this research, Racah moments color image descriptors are investigated. Channels separation for color images were involved in RGB color space, and Racah moments from each channel were computed individually. In experiments, we have performed the color image reconstructions from different color channels and various orders of Racah moments. Our experimental results have demonstrated that, by applying Racah moments, color images can be completely reconstructed without any information loss. We have also discovered that the individual set of Racah moments will uniquely describe the color image features, while the lower and higher orders of Racah moments will preserve more of features from the bottom right and top left regions of a color image, respectively.

4

Central-symmetrical property analysis on circularly orthogonal moments

Dai H., Liao S.

Journal of Theoretical and Applied Computer Science

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2014

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Vol. 8, nr 2

11--26

EN

In this research, we have proposed the central-symmetrical property of image reconstructions from Zernike moments and pseudo-Zernike moments. We conducted the image reconstructions from the odd, even, and complete sets of Zernike moments and pseudo-Zernike moments, and verified the proposed central-symmetrical property. We have concluded that if the original image is centrally symmetrical, the image reconstructions from even order sets are identical to those from the corresponding complete order sets of either Zernike or pseudo-Zernike moments.

5

Image analysis by orthogonal Fourier-Mellin moments

Wang X., Liao S.

Journal of Theoretical and Applied Computer Science

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2013

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Vol. 7, nr 1

70--78

EN

In this research, an attempt to analyze images with the orthogonal Fourier-Mellin moments is conducted. It leads to the conclusions that the lower order of orthogonal Fourier-Mellin moments primarily contain the fundamental image information; the higher order moments preserve more detailed image information; and each finite set of the moments will contribute individually in the reconstruction process. We have also discovered that, for the orthogonal Fourier-Mellin moments, the radial order n and harmonic order m tend to contain more information on harmonic patterns and radial patterns, respectively.

6

On the dynamics of a vaccination model with multiple transmission ways

Liao S., Yang W.

International Journal of Applied Mathematics and Computer Science

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2013

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Vol. 23, no. 4

761--772

EN

In this paper, we present a vaccination model with multiple transmission ways and derive the control reproduction number. The stability analysis of both the disease-free and endemic equilibria is carried out, and bifurcation theory is applied to explore a variety of dynamics of this model. In addition, we present numerical simulations to verify the model predictions. Mathematical results suggest that vaccination is helpful for disease control by decreasing the control reproduction number below unity.