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G. Lakshmi Vara Prasad,Venkatagurunatham Naidu Kollu,M. Sailaja,S. Radhakrishnan,K. Jagan Mohan,A. Kishore Reddy,G. Rajesh Chandra 한국전기전자재료학회 2024 Transactions on Electrical and Electronic Material Vol.25 No.1
In this paper, we delve into the intriguing realm of Pseudo-morphic High Electron Mobility Transistors (pHEMTs) composed of InAs∕In0.3Al0.7As∕InSb∕In0.3Al0.7As layers, utilizing Silvaco-TCAD for simulation. Our focus centers on the assessment of RF and analog electrical characteristics, with a keen eye on the high-temperature eff ects. The influence of temperature on device performance is meticulously evaluated in comparison to a reference device operating at room temperature. Traditionally, the critical parameters such as threshold voltage ( Vth ), transconductance ( gm ), and Ion∕Ioff ratio have been calculated within the temperature range spanning from 300 K to 700 K. The primary pHEMT device in our study exhibits impressive attributes, featuring a drain current of 950 mA, a threshold voltage of -1.75 V, a high transconductance ( gm ) value of 650 mS/mm, an Ion∕Ioff ratio of 1 × 106 , a transition frequency ( ft ) soaring to 790 GHz, and a maximum frequency ( fmax ) reaching a staggering 1.4 THz. However, as we traverse the temperature spectrum, our findings unveil a compelling narrative. The impact of rising temperature is unequivocal, triggering a cascade of transformations within the device. Notably, as the temperature escalates, we observe a noticeable decrease in current, a reduction in transconductance ( gm ), and a diminishing Ion∕Ioff ratio. To unravel the intricacies of these temperature-induced effects, we introduce the infusion of Machine Learning (ML) into our analysis.
Synthesis and Antimicrobial Evaluation of Sulfides, Sulfoxides, and Sulfones
A.B.V. Kiran Kumar,K.S.V. Krishna Rao,M. Subhosh Chandra,M.C.S. Subha,Yong Lark Choi 한국응용생명화학회 2009 Journal of Applied Biological Chemistry (J. Appl. Vol.52 No.1
Hydrogen peroxide, with sodium metavanadate as the catalyst, was used to achieve a highly efficient and selective oxidation of sulfides into sulfoxides and sulfones at room temperature in high yields and short reaction times. All of the sulfides oxidized into sulfoxides and sulfone derivatives were assayed for their in vitro antibacterial activities against Staphylococcus aureus, Bacillus cereus, Escherichia coli, and Pseudomonas aeruginosa, and antifungal activities against Aspergillus niger and Candida albicans. A remarkable inhibition of the growth of the bacterial and fungal strains was observed. This result suggested that the compounds are promising microbial agents. Hydrogen peroxide, with sodium metavanadate as the catalyst, was used to achieve a highly efficient and selective oxidation of sulfides into sulfoxides and sulfones at room temperature in high yields and short reaction times. All of the sulfides oxidized into sulfoxides and sulfone derivatives were assayed for their in vitro antibacterial activities against Staphylococcus aureus, Bacillus cereus, Escherichia coli, and Pseudomonas aeruginosa, and antifungal activities against Aspergillus niger and Candida albicans. A remarkable inhibition of the growth of the bacterial and fungal strains was observed. This result suggested that the compounds are promising microbial agents.
Chandra, I.,Kim, S.,Seto, T.,Otani, Y.,Takami, A.,Yoshino, A.,Irei, S.,Park, K.,Takamura, T.,Kaneyasu, N.,Hatakeyama, S. Pergamon Press ; Elsevier [distribution] 2016 Atmospheric environment Vol.141 No.-
<P>Field observations to investigate the correlation between New Particle Formation (NPF) and the long-range transport of air pollutants in the East Asia region were carried out on a rural Island of Japan in the East-China Sea (Fukue Island, 32.8 degrees N, 128.7 degrees E) over three periods (February 23 to March 7, 2013; November 7 to 20, 2013; and November 2 to 24, 2014). Frequent NPF events were identified (16 events in 50 days), typically in association with sudden increases in particle number concentrations and the successive growth of particles to mobility diameters of several tens of nanometers. The NPF events were classified into two types (A and B) according to the initially detected particle sizes (onset diameters). Type-A consisted of strong NPF events with onset diameters as small as 5 nm. Type-B consisted of NPF events whose onset (<10 nm) was not clearly identifiable. The correlations of SO2 concentrations, solar radiation, PM2.5 concentrations, and chemical composition were analyzed based on the types of NPF events. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Chandra, Girish,Moon, Yang Won,Lee, Yoonji,Jang, Ji Yong,Song, Jayoung,Nayak, Akshata,Oh, Kawon,Mulamoottil, Varughese A.,Sahu, Pramod K.,Kim, Gyudong,Chang, Tong-Shin,Noh, Minsoo,Lee, Sang Kook,Choi, American Chemical Society 2015 Journal of medicinal chemistry Vol.58 No.12
<P>On the basis of the potent inhibitory activity of neplanocin A (1) against S-adenosylhomocysteine (AdoHcy) hydrolase, we analyzed the comprehensive structure-activity relationships by modifying the adenine and carbasugar moiety of 1 to find the pharmacophore in the active site of the enzyme. The introduction of 7-deazaadenine instead of adenine eliminated the inhibitory activity against the AdoHcy hydrolase, while 3-deazaadenine maintained the inhibitory activity of the enzyme, indicating that N-7 is essential for its role as a hydrogen bonding acceptor. The substitution of hydrogen at the 6'-position with fluorine increased the inhibitory activity Of the enzyme. The one-carbon homologation at the 5'-position generally decreased the inhibitory activity of the enzyme, indicating that steric repulsion exists. A molecular docking study also supported these experimental data. In this study, 6'-fluoroneplanocin A (2) was the most potent inhibitor of AdoHcy hydrolase (IC50 = 0.24 mu M). It showed a potent anti-VSV activity (EC50 = 0.43 mu M) and potent anticancer activity in all the human tumor cell lines tested.</P>
Nath, K. Amar,Prasad, K.,Chandra, K.P.,Kulkarni, A.R. Techno-Press 2013 Advances in materials research Vol.2 No.2
Impedance and electrical conduction studies of $Ba(Nd_{1/2}Nb_{1/2})O_3$ ceramic prepared using conventional high temperature solid-state reaction technique are presented. The crystal symmetry, space group and unit cell dimensions were estimated using Rietveld analysis. X-ray diffraction analysis indicated the formation of a single-phase cubic structure with space group $Pm\bar{3}m$. Energy dispersive X-ray analysis and scanning electron microscopy studies were carried to study the quality and purity of compound. The circuit model fittings were carried out using the impedance data to find the correlation between the response of real system and idealized model electrical circuit. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type and negative temperature coefficient of resistance character. The correlated barrier hopping model was employed to successfully explain the mechanism of charge transport in $Ba(Nd_{1/2}Nb_{1/2})O_3$. The ac conductivity data were used to evaluate the density of states at Fermi level, minimum hopping length and apparent activation energy.
Synthesis and Antimicrobial Evaluation of Sulfides, Sulfoxides, and Sulfones
Kumar, A.B.V. Kiran,Rao, K.S.V. Krishna,Chandra, M. Subhosh,Subha, M.C.S.,Choi, Yong-Lark The Korean Society for Applied Biological Chemistr 2009 Journal of Applied Biological Chemistry (J. Appl. Vol.52 No.1
Hydrogen peroxide, with sodium metavanadate as the catalyst, was used to achieve a highly efficient and selective oxidation of sulfides into sulfoxides and sulfones at room temperature in high yields and short reaction times. All of the sulfides oxidized into sulfoxides and sulfone derivatives were assayed for their in vitro antibacterial activities against Staphylococcus aureus, Bacillus cereus, Escherichia coli, and Pseudomonas aeruginosa, and antifungal activities against Aspergillus niger and Candida albicans. A remarkable inhibition of the growth of the bacterial and fungal strains was observed. This result suggested that the compounds are promising microbial agents.
N. Bindushree,A. Dhabale,M. S. Dhanush,A. Honakeri,A. Ankit,M. K. Anusha,R. Kumar,H. K. Choudhary,V. Khopkar,K. Chandra Sekhar,B. Sahoo 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.6
We report the method of tuning the thermal conductivity through the composition of multiwall carbon nanotube (MWCNT)dispersed ethylene glycol based nanofluids. The structure and properties of the MWCNTs were characterized by scanningelectron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectroscopy and thermogravimetric analysis. A parallel plate thermal conductivity (PPTC) set up was fabricated and used for measurement of thermal conductivityof the nanofluids. We have prepared ethylene glycol based nanofluids containing 0.05, 0.1, 0.15, 0.20, 0.25 and 0.35 wt%of MWCNTs. The thermal conductivities of these fluids were measured by keeping them between the two (parallel) plates,referred as the hot and the cold plates, of the sample holder in the PPTC apparatus. The lower plate was water-cooled andthe upper plate was heated. The temperature of the hot plate was varied between 35 and 80 °C. The thermal conductivityof the fluids was calculated using the one-dimensional heat conduction equation. According to our observation, an efficientheat transfer occurs through the nanofluids with an optimum concentration of 0.20 wt% of CNTs. Our work demonstrates the importance of the composition of the nanofluids and their structural defects in heat transfer.