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K. Ramachandran,Awan Zahoor,T. Raj Kumar,남기석,A. Balasubramani,G. Gnana Kumar 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
The tetragonal a-phase structured manganese dioxide nanorods were densely grown over the nitrogendoped graphite nanofibers (NGNF/MnO2) via a facile and one-pot hydrothermal technique. Theamperometric results depicted that NGNF/MnO2 composite exhibited a high sensitivity of1096 mAmM 1 cm 2 and a wide linear range from 0.1 to 11 mM with the lower detection limit of1.25 mMtoward the non-enzymatic hydrogen peroxide (H2O2) detection, owing to the synergistic effectsof NGNF and MnO2. In the prospect of excellent selectivity, real sample analysis and other strikingadvantages, the developed non-enzymatic sensors hold promising potential for the tight monitoring ofH2O2 in the food and clinical diagnosis fields.
Ramachandran Anirudh,Montenegro Michelle,Singh Maninder,Dixon Trevor,Kayani Waqas,Liang Timothy,Yu Nick,Reddy Srinivas,Liveris Anna,Manyapu Mallika,McEwan Alyssia A.,Nguyen Vincent T.,Sonenthal Necham 대한응급의학회 2022 Clinical and Experimental Emergency Medicine Vol.9 No.3
Objective Hip fractures are associated with significant morbidity and mortality. Ultrasound-guided peripheral nerve blocks are a safe method to manage pain and decrease opioid usage. The pericapsular nerve group (PENG) block is a novel, potentially superior block because of its motor-sparing effects. Through training, simulation, and supervision, we aim to determine whether it is feasible to perform the PENG block in the emergency department. Methods Phase 1 consisted of emergency physicians attending a workshop to demonstrate ultrasound proficiency, anatomical understanding, and procedural competency using a low-fidelity model. Phase 2 consisted of a prospective, observational, feasibility study of 10 patients with hip fractures. Pain scores, side effects, and opioid usage data were collected. Results The median pain score at time 0 (time of block) was 9 (interquartile range [IQR], 6.5–9). The median pain score at 30 minutes was 4 (IQR, 2.0–6.8) and 3.5 (IQR, 1.0–4.8) at 4 hours. All 10 patients required narcotics prior to the initiation of the PENG block with a median dosage of 6.25 morphine milligram equivalents (MME; IQR, 4.25–7.38 MME). After the PENG block, only 30% of the patients required further narcotics with a median dosage of 0 MME (IQR, 0–0.6 MME) until operative fixation. Conclusion In this feasibility study, PENG blocks were safely administered by trained emergency physicians under supervision. We demonstrated data suggesting a trend of pain relief and decreased opiate requirements, and further investigation is necessary to measure efficacy.
DCMIP2016: the splitting supercell test case
Zarzycki, Colin M.,Jablonowski, Christiane,Kent, James,Lauritzen, Peter H.,Nair, Ramachandran,Reed, Kevin A.,Ullrich, Paul A.,Hall, David M.,Taylor, Mark A.,Dazlich, Don,Heikes, Ross,Konor, Celal,Rand Copernicus GmbH 2019 Geoscientific model development Vol.12 No.3
<P><p><strong>Abstract.</strong> This paper describes the splitting supercell idealized test case used in the 2016 Dynamical Core Model Intercomparison Project (DCMIP2016). These storms are useful test beds for global atmospheric models because the horizontal scale of convective plumes is O(1&thinsp;km), emphasizing non-hydrostatic dynamics. The test case simulates a supercell on a reduced-radius sphere with nominal resolutions ranging from 4 to 0.5&thinsp;km and is based on the work of <span class='cit' id='xref_text.1'><a href='#bib1.bibx10'>Klemp et al.</a> (<a href='#bib1.bibx10'>2015</a>)</span>. Models are initialized with an atmospheric environment conducive to supercell formation and forced with a small thermal perturbation. A simplified Kessler microphysics scheme is coupled to the dynamical core to represent moist processes. Reference solutions for DCMIP2016 models are presented. Storm evolution is broadly similar between models, although differences in the final solution exist. These differences are hypothesized to result from different numerical discretizations, physics-dynamics coupling, and numerical diffusion. Intramodel solutions generally converge as models approach 0.5&thinsp;km resolution, although exploratory simulations at 0.25&thinsp;km imply some dynamical cores require more refinement to fully converge. These results can be used as a reference for future dynamical core evaluation, particularly with the development of non-hydrostatic global models intended to be used in convective-permitting regimes.</p> </P>
Ramachandran, K.,Zahoor, A.,Raj Kumar, T.,Nahm, K.S.,Balasubramani, A.,Gnana Kumar, G. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.46 No.-
<P>The tetragonal alpha-phase structured manganese dioxide nanorods were densely grown over the nitrogen doped graphite nanofibers (NGNF/MnO2) via a facile and one-pot hydrothermal technique. The amperometric results depicted that NGNF/MnO2 composite exhibited a high sensitivity of 1096 mu A mM(-1) cm(-2) and a wide linear range from 0.1 to 11 mM with the lower detection limit of 1.25 mu M toward the non-enzymatic hydrogen peroxide (H2O2) detection, owing to the synergistic effects of NGNF and MnO2. In the prospect of excellent selectivity, real sample analysis and other striking advantages, the developed non-enzymatic sensors hold promising potential for the tight monitoring of H2O(2) in the food and clinical diagnosis fields. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Topological flat Wannier-Stark bands
Kolovsky, A. R.,Ramachandran, A.,Flach, S. American Physical Society 2018 Physical review. B Vol.97 No.4
<P>We analyze the spectrum and eigenstates of a quantum particle in a bipartite two-dimensional tight-binding dice network. In the absence of a dc bias, it hosts a chiral flatband with compact localized eigenstates. In the presence of a dc bias, the energy spectrum consists of a periodic repetition of one-dimensional energy band multiplets, with one member in the multiplet being strictly flat. The corresponding flatband eigenstates cease to be compact, and are localized exponentially perpendicular to the dc field direction, and superexponentially along the dc field direction. The band multiplets are characterized by a topological quantized winding number (Zak phase), which changes at specific values of the varied dc field strength. These changes are induced by gap closings between the flat and dispersive bands, and reflect the number of these closings.</P>
Arul, N. Sabari,Mangalaraj, D.,Ramachandran, R.,Grace, A. Nirmala,Han, Jeong In The Royal Society of Chemistry 2015 Journal of materials chemistry. A, Materials for e Vol.3 No.29
<▼1><P>Hybrid CeO2/Fe2O3 composite nanospindles (CNSs) are synthesized by a simple and cost effective co-precipitation method, utilized for wastewater treatment and energy storage applications.</P></▼1><▼2><P>Hybrid CeO2/Fe2O3 composite nanospindles (CNSs) are synthesized by a simple and cost effective co-precipitation method. CeO2/Fe2O3 CNSs used as an efficient recyclable photocatalyst for degrading Eosin Yellow (EY) dye under visible light irradiation possess a high degradation rate of 98% after 25 min. The estimated electrical energy efficiency of CeO2/Fe2O3 CNSs shows the consumption of less energy (6.588 kW h m<SUP>−3</SUP> per order) in degrading EY. Besides, the CeO2/Fe2O3 CNS exhibits a specific capacitance of 142.6 F g<SUP>−1</SUP> at a scan rate of 5 mV s<SUP>−1</SUP>. Moreover, the composite displays an excellent capacitance retention of 94.8% after 1000 cycles. This newly designed CeO2/Fe2O3 CNS with enhanced visible light-driven photocatalytic activity and good supercapacitive cycling stability has great potential for use in wastewater treatment and energy storage applications.</P></▼2>
A. Thirumurugan,S. Ramachandran,Neethu Anns Tomy,G. J. Jiflin,G. Rajagomathi 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.12
Biological sources of microorganisms and plants are playing a major role in the reduction of metallic nanoparticles such as silver and gold, as it emerges as an eco-friendly and exciting approach in nanotechnology. We report on the biological synthesis of gold nanoparticles using the culture supernatant of Bacillus subtilis and its effect on increased antibacterial and antifungal activities against clinically isolated organism. When the supernatant of Bacillus subtilis was added to HAuCl4 aqueous solution, HAuCl4 was reduced as Au+ ions, which confirmed the presence of nanoparticles by the color change of pale yellow to purple. The minimum and maximum peaks were observed at 24th and 120th hours by UV-Visible spectroscopy. The combined antibacterial and antifungal activities with various antibiotics were observed against clinical isolates.
Hema Ramachandran,A. A. Amirul 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.6
Discharging the unrefined glycerine, a by-productfrom biodiesel production is the simplistic solution adoptedfor its management which has led to its price reduction inthe market worldwide and created serious environmentalimpact. Therefore, we have explored the application ofunrefined glycerine pitch as direct fermentative substratein the biosynthesis of novel yellow-pigmented poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-co-4HB)]copolymer by Cupriavidus sp. USMAHM13 through onestagecultivation. Utilization of glycerine pitch (10 g/L)together with 1,4-butanediol (5 g/L) had resulted in thehighest achievement of 2.91 g/L of P(3HB-co-40%4HB)copolymer which was naturally dyed with the yellowpigment through the co-extraction process. Enhancementof 4HB monomer accumulation was also attained throughthe addition of ammonium acetate as nitrogen source. Itwas revealed that utilization of recovered crude glycerinefrom glycerine pitch was more preferred compared to theother recovered components. Utilization of glycerine pitchin the biosynthesis of P(3HB-co-4HB) copolymer wouldnot only contribute to the efficient waste management butalso would promote the development of cost-efficiencymicrobial fermentation.
Letter : Site Suitability Assessment for Joint Forest Management (JFM)-a Geospatial Approach
S. Jayakumar,A. Ramachandran,G. Bhaskaran,Joon Heo,Woo Sun Kim 大韓遠隔探査學會 2007 大韓遠隔探査學會誌 Vol.23 No.5
Joint Forest Management (JFM) is a concept of developing partnerships between fringe forest user groups and the Forest Department (FD) on the basis of mutual trust and jointly defined roles and responsibilities with regard to forest protection and development. In India, JFM was started during 1992 and it was implemented in many states. However success rate of JFM activity was not promising. Though there are many factors attributed to the failures, one of the main factors is the JFM site. This paper deals with the significant ground works to be done before planning for JFM using recent technologies such as remote sensing (RS) and Geographic Information System (GIS). Also it deals with the advantages of weighted overlay analysis in selecting suitable sites for JFM taking into consideration the various criteria. As a result of weighted overlay analysis, there were four types of suitability classes viz., less, moderate, highly and un-suitable. The moderately suitable class occupied maximum area (13209.64 ha) than less and highly suitable classes. If JFM is implemented on the suitability area, then the failure could be avoided in the future.