Seminar khoa học của PGS.TS Arkhincheev Valerii và TS. Subramanian Ramanathan

Vào 14h00, ngày 12/12/2025 Viện IAST tổ chức buổi trao đổi học thuật tại Phòng họp B (Cơ sở Tân Hưng) và Phòng 604, 99 Trần Quốc Toản (Cơ sở Hà Nội) với nội dung chi tiết như sau:

1. PGS.TS Arkhincheev Valerii báo cáo về chủ đề: Topological transitions in LC system. Classic analog of quantum transitions.
Abstract: This report investigates percolation transitions in a disordered L-C system composed of inductors and capacitors (non-dissipative reactive elements). These transitions occur between different percolating states, resulting in distinct, constant values of the effective conductivity. We employ an exact approach based on the rotational symmetry of two-dimensional DC equations. A new type of topological phase transition is identified for these non-dissipative systems. The characteristics of these transitions, which are analogs of topological invariants, are calculated. We propose that these transitions may be considered a classical analog of quantum transitions, such as the quantum Hall effect.

2. TS. Subramanian Ramanathan báo cáo về chủ đề: Rhodamine B dye degradation using waste face mask-derived carbon (UFMC) coupled with peroxymonosulfate (PMS)
Abstract: Catalytic carbon materials from used face masks (UFM) activated by peroxymonosulfate (PMS) were developed for the degradation of rhodamine B (RhB) dye in aqueous solution. The UFM-derived carbon (UFMC) catalyst had a relatively large surface area as well as active functional groups and promoted the generation of singlet 1O2 and radicals from PMS, giving a high RhB degradation performance (98.1% after 3 h) in the presence of 3 mM PMS. The UFMC could degrade only 13.7% at a minimal RhB dose of 105 M. The principal reactive oxygen species of sulphate (SO 4 • ), hydroxyl radicals ( • OH), and singlet 1O2 were discovered using electron paramagnetic resonance and radical scavenger studies. Finally, a toxicological plant and bacterial study was performed to demonstrate the potential non-toxicity of the degraded RhB water sample.