Browsing by Department "Duy Tan University"

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Self-dual double circulant, self-dual double negacirculant and LCD double negacirculant codes over the ring F[]/⟨2-, 2-, ⟩
(2023) Dinh, Hai Q.; Yadav, Bhanu Pratap; Nguyen, Bac T.; Upadhyay, Ashish Kumar; Yamaka, Woraphon
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
In this paper, we investigate self-dual double circulant, and self-dual and linear complementary dual (LCD) double negacirculant codes over a finite ring R = F_q + u F_q + v F_q + uv F_q , where u^2=u , v^2=v , uv=vu and q=p^m. We study the algebraic structure of double circulant codes over R. We provide necessary and sufficient conditions for a double circulant code to be a self-dual code. We give a formula to get the total number of self-dual double circulant codes over the ring R. We compute distance bounds for self-dual double circulant codes over R. In addition, by using a Gray map, we show that the families of self-dual double circulant codes under the Gray map are asymptotically good. Moreover, the algebraic structure of double negacirculant codes and necessary and sufficient conditions for a double negacirculant code to be a self-dual code and to be an LCD code are also given. We determine the total number of self-dual and LCD double negacirculant codes over R.
Synthesis of Graphene-Based Biopolymer TiO2 Electrodes Using Pyrolytic Direct Deposition Method and its Catalytic Performance
(2020-09) Kaur, Parminder; Frindy, Sana; Park, Yuri; Sillanpää, Mika; Imteaz, Monzur A.
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
The traditional methods used to synthesize graphene layers over semiconductors are chemical-based methods. In the present investigation, a novel photoelectroactive electrode was synthesized using a chitosan biopolymer without the usage of chemicals. A chitosan-biopolymer layer over the surface of TiO2 was generated by electrodeposition. Furthermore, the pyrolysis method was used for the conversion of a biopolymer into graphene layers. The catalytic activity of the fabricated electrodes was investigated by the photo-electro-Fenton (PEF) process to oxidize chloramphenicol and nadolol pharmaceutical drugs in wastewater, remove metals (scandium, neodymium, and arsenic) and degrade real municipal wastewater. The PEF operational parameters (pH, voltage, reaction time, and Fenton catalytic dose) were optimized for the overall degradation of chloramphenicol and nadolol pharmaceutical drugs in wastewater. It was observed that at the optimum process operational parameters it took 40 min to degrade chloramphenicol and nadolol pharmaceutical drugs in wastewater. It was proved that biopolymer-based photoelectroactive novel electrodes render good catalytic activity. Furthermore, the reusability study of fabricated electrodes showed excellent storage and self-healing properties.