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- 저자 : Subhasis (검색결과 26 건)
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Anomalous Hall signatures of nonsymmorphic nodal lines in doped chromium chalcospinel CuCr₂Se₄
Subhasis Samanta,Gang Chen,Heung-Sik Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
Dissipationless transport has been a hallmark of topological phases of matters in condensed matter systems. Very often, dissipationless transport in quantum materials originates from band topology of electronic structures. An emerging phase of matter among the class of topological materials is nodal line semimetal, possessing symmetry-protected one-dimensional gapless lines at or close to the Fermi level in momentum space. Here, we study Cr-based ferromagnetic chalcospinel CuCr<sub>2</sub>Se<sub>4</sub> via first principles calculations and ab-initio tight binding method to reveal true origin of large anomalous Hall signature upon electron doping, which was not well understood for more than a decade. We find that interplay between spin-orbit coupling and ferromagnetism of doubly degenerate nonsymmorphic nodal line at the zone boundary is responsible for previously observed distinct behavior of large anomalous Hall signature in the presence of electron doping. The splitting of nodal line via spin-orbit coupling produces a large Berry curvature, which leads to a sharp increase in anomalous Hall conductivity. The Hall response is largely tunable via switching of magnetization direction and varying doping concentration. The topological nature of anomalous Hall response makes CuCr<sub>2</sub>Se<sub>4</sub> a promising candidate for realization of low power spintronics applications.
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Subhasis Mandal,Amiya K. Jana 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Thermodynamic phase equilibrium of the reactive HIx system encountered in the sulfur-iodine (SI) cycle has been identified as a basic research need for the hydrogen economy. In this communication, a simple NRTL (nonrandom two-liquid)-based vapor–liquid equilibrium (VLE) model is devised for the HIx system considering the HI decomposition reaction in the gas phase only. We propose a new set of NRTL binary interaction parameters as well as a new expression for the HI decomposition chemical equilibrium constant as a function of temperature. This simple VLE model with the use of only one set of NRTL binary parameters is capable of reproducing the Larousse et al. (Int. J. Hydrogen Energy 34 (2009) 3258–3266) experimental data for a wide range of pressures (1–24 bar) and HI concentrations beyond the azeotrope. 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V.
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( Subhasis S Talapatra ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
An 80 year old lady presented to the hospital following a generalised tonic clonic seizure in the context of well controlled epilepsy consequent to cerebral injury (meningitis and cerebral abscess in 1975 and subsequent neurosurgery). She was loaded with Phenytoin, in addition to her regular Sodium Valproate. She developed diffuse erythematous rash after 3 days of hospitalisation, which dramatically progressed within 48 hours to a myriad of dermatological manisfestations from erythematous macules with purpuric centers, vesicles and bullae to epidermal necrolysis, desquamation (and positive Nikolsky sign), consistent with fulminant toxic epidermal necrolysis. Subsequently, she was transferred to a tertiary hospital Intensive care unit with support from specialised burns unit and dermatology services. Her dermatological manifestation progressed to 100% total body surface area epidermal necrolysis and skin loss, complicated with systemic mucosal involvement (and ocular sparing) and a fatal outcome due to uncontrollable extensive fl uid losses and multi-organ failure, highlighting poor outcomes of fulminant toxic epidermal necrolysis in the elderly.
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Poster Session : PS 0381 ; Infectious Disease ; An Unusual Case of Headache
( Subhasis S Talapatra ),( Tommy Tsang ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
A 45 year old man, presented with headache in the context of recent travel to Thailand and wet soil contact. He was immune competent and had no history of chronic diseases. His initial clinical examination was unremarkable except the reproducible pain over left temporal region. Initial laboratory assay was suggestive of an infective pathology but no positive microbiological diagnosis. A CSF assay was unremarkable and travel region endemic infective screening was negative. Computed tomography and magnetic resonance imaging studies did not reveal any acute abnormality. He developed high grade fevers for fi rst three days of hospitalisation but his vitals remained stable without any evidence of any organ dysfunction. Emperical therapy commenced with third generation cephalosporin and tetracycline, with improvement of infi ammatory biomarkers but persisting left temporal headache and nocturnal diaphoresis with fever. However a clinical improvement was noted by day seven with no constitutional symptoms but persisting low grade headache. A nuclear bone scan revealed focal gallium activity in the left temporoparietal region of the skull vault, indicating an infiammatory focus. Neurosurgical and Infectious diseases team opinion was sought and patient transferred to a tertiary hospital for further workup. An incisional drainage of left temporal sub-galeal abscess and a bone biopsy was performed and tissue culture revealed Burkholderia pseudomallei while bone biopsy suggested acute on subacute osteomyelitis. Meliodosis serology was positive. A diagnostic conclusion of Burkholderia pseudomallei osteomyelitis of left temporal bone with subgaleal abscess was made. Pathogenesis was attributed to hematogenous spread following initial respiratory inoculation from wet soil contact. He was successfully treated with intravenous Ceftazidime 6g daily for 6 weeks and Trimethoprim-Sulfamethoxazole DS 800mg/150mg two tablets BD for one month followed by 800mg/150mg one tablet bd for total duration of therapy of 6 months, with complete resolution of symptoms.
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Mandal, Subhasis,Jana, Amiya K. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.2
In this article, we develop a reactive distillation (RD) column configuration for the production of hydrogen. This RD column is in the HI decomposition section of the sulphur - iodine (SI) thermochemical cycle, in which HI decomposition and H<sub>2</sub> separation take place simultaneously. The section plays a major role in high hydrogen production efficiency (that depends on reaction conversion and separation efficiency) of the SI cycle. In the column simulation, the rigorous thermodynamic phase equilibrium and reaction kinetic model are used. The tuning parameters involved in phase equilibrium model are dependent on interactive components and system temperature. For kinetic model, parameter values are adopted from the Aspen flowsheet simulator. Interestingly, there is no side reaction (e.g., solvation reaction, electrolyte decomposition and polyiodide formation) considered aiming to make the proposed model simple that leads to a challenging prediction. The process parameters are determined on the basis of optimal hydrogen production as reflux ratio = 0.87, total number of stages = 19 and feeding point at 8th stage. With this, the column operates at a reasonably low pressure (i.e., 8 bar) and produces hydrogen in the distillate with a desired composition (H<sub>2</sub> = 9.18 mol%, H<sub>2</sub>O = 88.27 mol% and HI = 2.54 mol%). Finally, the results are compared with other model simulations. It is observed that the proposed scheme leads to consume a reasonably low energy requirement of 327 MJ/kmol of H<sub>2</sub>.
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Roy, Subhasis,Han, Gill Sang,Shin, Hyunjung,Lee, Jin Wook,Mun, Jinsoo,Shin, Hyunho,Jung, Hyun Suk American Scientific Publishers 2015 Journal of nanoscience and nanotechnology Vol.15 No.6
<P>We report a novel method of synthesizing rutile TiO2 nanocrystals at low temperature (200 degrees C) via a butanol rinsing process followed by heat treatment in an O2 atmosphere. The rutile nanocrystals show uniform size distribution of approximately 20 nm and good crystallinity confirmed by X-ray diffraction and transmission electron microscopy. A mechanism for the low temperature synthesis of rutile nanocrystals is rationalized in terms of an explosive thermal decomposition reaction of butoxy groups on TiO2 powders with O2 gas. Characterizations of the photovoltaic and photocatalytic properties of rutile nanocrystals exhibited higher photoactivity than large-sized conventional rutile powder, which demonstrates that this novel synthesis technology could expand applications of rutile powders to various photoactive devices beyond solar cells and photocatalysts.</P>
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Bhadra Subhasis 한국사회복지학회 2021 Asian Social Work and Policy Review Vol.15 No.3
Poor are vulnerable, frail, battered, marginalized, voiceless, and victim of multiple social circumstances. The complex vulnerable existence always made them suffer and become double victims of any disaster, be it natural, human-made, or biological like pandemic COVID-19. Poverty in India is an outfall of a number of complex social realities, historical past, and present doldrums. Restrictions due to lockdown and a shrinking economy, the job market as the immediate impact caused a number of survival crises for the rural families. The situation of rural poor becomes even more aggravated, as the reverse migration and influx of population increased the consumption and demand for jobs that actually the rural livelihood sector can provide. While the pre-existing vulnerabilities of the poor are exposed in the pandemic, the government's response toward them showed its restricted efficiency. The pandemic COVID-19 has taken human-life hostage and effective sustainable strategies to manage the crisis of the poor vulnerable section were essential for long-term resolution. Thus, the professional challenge ahead is designing a sustainable strategy of working in such pandemic situations that social workers are professionally skilled to handle similar challenges.
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