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1

Influence of application of attapulgite on the structure and composition of self-dynamic membrane in bioreactors

Duan W., Ling C., Fu D., Xu X.

Environment Protection Engineering

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2016

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Vol. 42, nr 2

171--182

EN

The effect of application of attapulgite on the structure and composition of a dynamic membrane (DM) of a bioreactor was investigated by means of the electron microscopy, polymerase chain reaction (PCR) and denaturing gradient gel electrophoresis (DGGE). A significant increase of microbial floc size in the bioreactors upon attapulgite application was observed. The content of cake layer in the hybrid dynamic membrane (HDM) and in the dynamic membrane (DM) in the corresponding bioreactor systems were 44.73 g/m2 and 38.12 g/m2 respectively, while the contents of mineral – 6.09 g/m2 and 5.34 g/m2, respectively. Further, with addition of attapulgite, the concentration of extracellular polymeric substances (EPS) in the HDM bioreactor system decreased, whereas the content of suspended particulate matter increased. Self-DM has a porous structure with high porosity. Mineral sub-stance, including O, Ka, Ca, P, S, Cl, Mg and Si, are the main elements in DM, but the main elements content exhibited an increase trend in DM with attapulgite administration. These results showed a positive correlation between the quantity of bacterial populations and biological removal improvement, which indicated that application of attapulgite could optimize the structure of self-DM in bioreactors.

2

Capacity and security for imperfect batch steganography

Chen G., Zhang M., Chen J., Fu D., Wu Y.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 7b

324--327

EN

Batch steganography aims to conquer the limitations of capacity and security of data hiding with a single cover, and it is to spread secret information among a large number of covers, having improved basic algorithm and strategies of stegosystem. The steganographic features of batch covers and single cover were compared to propose a theoretic model for batch steganography. According to Kullback-Leibler divergence of batch steganography, the relationship of imperfect steganographic capacity with a formalized number of batch covers and embedding strategies was put forward. The maximum payload of an imperfect batch steganographiy (IBS) was determined by the number of batch covers and the base cover set and proved by formulations, and compared with capacity of noisy channels. The results show that the model under constraints of IBS is feasible for batch steganography.The research results are helpful for stegosystem design and steganalysis.

PL

Artykuł analizuje możliwości steganografii – metody szyfrowania nie tylko treści, ale także ukrywania w ogóle faktu obecności przesyłu wiadomości.

3

Robust H∞ control for uncertain neutral time-delay systems with discrete and distributed delays

Sun M., Fu D.

Control and Cybernetics

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2011

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Vol. 40, no 1

25-38

EN

In this paper, the robust H∞ control problem is considered for uncertain neutral systems with discrete and distributed tirne delays. Some sumcient conditions on H∞, robust performance analysis are obtained in terms of linear matrix inequalities (LMIs) by using a descriptor model transformation of the system and by applying Park's inequality for bounding cross terms. Based on these conditions the state-feedback H∞ controller is designed. Numerical examples are included to illustrate the proposed method.