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Sudhanshu Shekher Pati,Pranay Kant Prasad,Abhinav Kr Singh,Sandeep Singh,Shailesh Kumar Prasad 한국부식방식학회 2022 Corrosion Science and Technology Vol.21 No.2
A study on water-based epoxy coated on mild steel using the electroplating method was conducted to optimize the process parameters for dry film thickness to achieve superior paint quality at optimal cost in an automotive plant. The regression model was used to adjust various parameters such as electrode voltage, bath temperature, processing time, non-volatile matter, and surface area to optimize the dry film thickness. The average dry film thickness computed using the model was in the range of 15 – 35 μm. The error in the computed dry film thickness with reference to the experimentally measured dry film thickness value was - 0.5809%, which was well within the acceptable limits of all paint shop standards. Our study showed that the dry film thickness on mild steel was more sensitive to electrode voltage and bath temperature than processing time. Further, the presence of non-volatile matter was found to have the maximum impact on dry film thickness.
Delineation of the evacuation route plan, relief camp and prioritization using GIScience
Joy, Jean,Kanga, Shruti,Singh, Suraj Kumar,Sudhanshu, Sudhanshu Techno-Press 2021 Advances in environmental research Vol.10 No.1
Rising urban flood patterns are a universal phenomenon and a significant challenge for city government and urban planners worldwide. Urban flood problems range from relatively localized incidents to substantial incidents, which lead to cities being flooded for a few hours to several days. Therefore, the effect may be widespread, such as the temporary displacement of individuals, disruption to civic facilities, water quality degradation and the possibility of epidemics. The problems raised by urban flooding are highly challengeable and compound by ongoing climate change, with adverse implications for changes in rainfall and gaps in intra-urban rainfall distribution. Unplanned construction and invasions of large houses along rivers and watercourses have interfered in natural rivers and watercourses. As a result, the runoff has risen in proportion to the urbanization of the urban floods. The location of the relief camp and the priority for evacuation were determined, and the safest route to avoid floods were established. This method can be used for emergency planning in future flood incidents, and it will help plan disaster preparedness for Panchayat. This study will promote the flood plain's potential use for disaster management and land use planning virtually.
Vijay Mandal,Shashank Sharma,Sudhanshu S. Singh,J. Ramkumar 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
Laser surface texturing can improve the surface properties of the metallic components. In this work, surface texturing hasbeen carried in a powder bed fusion of Inconel 718 (IN718) rather than material removal process. A 2D fnite element method(FEM) has been built to simulate the thermo-fuidic dynamics of surface texturing, incorporating the phase-feld method inthe preplaced IN718 powder. The temperature and induced velocity felds have been predicted using transient heat transferand fuid fow based on the conservation of mass, momentum, and energy in the melt pool. Furthermore, the roles of drivingforces such as Marangoni force, recoil pressure, and thermal buoyancy force on the melt pool behavior have been evaluated. Micro-textures were developed using laser on the powder bed by using diferent scanning patterns, such as line, circle, hatchand convex dimple. The efect of process parameters (pitch distance, number of pulses and number of layers) on the surfacehydrophobicity were evaluated by measuring the contact angle, where the convex dimple texture exhibited the maximumcontact angle. The hydrophobicity was afected by the ripples (2nd level of roughness) on the surface, which increased withan increase in number of pulses.
Manish Srivastava,Jay Singh,Rajneesh K. Mishra,Manish K. Singh,Animesh K. Ojha,Madhu Yashpal,Srivastava Sudhanshu 한국물리학회 2014 Current Applied Physics Vol.14 No.7
A study on Lithium ferrite/chitosan nanocomposite (LFCN), easily moldable into arbitrary shapes, as the conducting polymer and ferromagnetic characteristics is presented. The composite material is produced in the presence of Li0.5Cr0.1Fe2.4O4 and Li0.5Co0.1Fe2.4O4 nanoparticle by ex-situ polymerizations process. Various characterizations techniques have been used to explore the characteristic of the synthesized products. The frequency dependent dielectric properties and electrical conductivity of all the samples have been measured through complex impedance plot in the frequency range of 1 kHze6 MHz at room temperature. It was observed that in case of (LFCN), fluctuation in value of (ε 0) and (ε 00) is ceased over the frequency range of 4 Mz which can be attributed to the steady storage and dissipation of energy in the nanocomposite system. Moreover, it is also observed that electrical conductivity of (LFCN) increases with frequency and its value was found to be (0.032e0.048) (ohm-cm)1 in frequency range of 1 kHze6 MHz. Due to its low cost, a simple synthesis process and high flexibility, the proposed LFCN may find applications in various types of electronic components.
Ashwani Kumar,Bhagyaraj Jayabalan,Chetan Singh,Jayant Jain,Subrata Mukherjee,Krishanu Biswas,Sudhanshu S. Singh 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
In the current study, lanthana (La2O3) based oxide dispersion strengthened (ODS) ferritic steels (Fe–xCr–1Ti–1W–0.5L2O3,x = 14, 18, 22, and 26, in wt%) have been fabricated by mechanical alloying and spark plasma sintering. The role of chromium(Cr) content and maximum sintering temperature (1050 and 1100 °C) on the density, microstructure and mechanical propertiesof the ODS steels have been studied. TEM analysis of the alloy revealed the presence of nano-sized (2–8 nm) complexoxide particles, i.e., La–Ti–Cr–O. Mechanical properties were estimated in terms of micro-hardness, nano-hardness, Young’smodulus and compressive strength. The highest micro-hardness (988 ± 11.3 HV) and compressive strength (2322 ± 49 MPa)were exhibited by the alloy having 26 wt% Cr, sintered at 1100 °C. The contribution of dispersion strengthening towards thestrength was calculated to be the highest (~ 72%). Overall, increasing the Cr content improved both the room temperaturecompressive strength as well as the compressive fracture strain.
Gokhale, Aditya,R, Sarvesha,Huang, E-Wen,Lee, Soo Yeol,Prasad, Rajesh,Singh, Sudhanshu S.,Jain, Jayant Elsevier 2019 Materials letters Vol.246 No.-
<P><B>Abstract</B></P> <P>In the present work, grain boundary sliding (GBS) has been studied for the grains exhibiting different orientations (for indentation parallel and perpendicular to < c > axis) at different temperatures (RT to 200 °C) using nanoindentation in pure Zn. Electron back scattered diffraction was utilized to determine the orientation of the indented grains and identify the deformation mechanism, whereas atomic force microscopy was utilized to systematically quantify the GBS. Results indicated that indentation perpendicular to < c > axis exhibits slip induced GBS, whereas the indentation parallel to < c > axis results in pure GBS. The amount of GBS was also found to be strongly dependent upon the orientation of the neighboring grain. Further, the contribution from GBS towards total stain was found to increase with an increase in temperature.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First study that characterises orientation and temperature effect on GBS in Zn. </LI> <LI> Indentation perpendicular to <c> axis exhibits slip induced GBS. </LI> <LI> Indentation parallel to <c> axis results in pure GBS. </LI> <LI> The contribution of GBS increases with an increase in temperature. </LI> </UL> </P>
Understanding the electrocatalysis OER and ORR activity of ultrathin spinel Mn3O4
Chinmayee Chowde Gowda,Ankita Mathur,Arko Parui,Partha Kumbhakar,Prafull Pandey,Sudhanshu Sharma,Amreesh Chandra,Abhishek K. Singh,Aditi Halder,Chandra Sekhar Tiwary 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Rapid depletion of non-renewable sources has made us look into possible green energy alternatives tomeet energy challenges. Electrocatalytic reactions involving oxygen evolution reaction (OER) and oxygenreduction reaction (ORR) play crucial roles in assisting the derivation of clean forms of energy. Here, wedemonstrate that few layers of the manganese oxide: hausmannitene (atomically thin two dimensional(2D-Mn3O4) can be exfoliated from its bulk form hausmannite (Mn3O4). Most significantly, the hausmanniteneexhibits catalytic activity towards oxygen reduction and evolution reactions. The hausmannitenehas enhanced Mn(III) ions (65%) compared to its parent structure hausmannite (31%). The Mn(III) ionsin a distorted lattice show the highest catalytic activity towards OER performance with the oxygen electrodeactivity (DE) of 1.08 eV for hausmannitene. The density functional theory (DFT) calculations, confirmedthe presence of both Mn(III) and Mn(II) sites on the (112)-oriented surface of Mn3O4 which arehighly active for OER and ORR, having vacant and filled orbitals of lowest and highest energy, respectively. Increased oxidation sites aiding to better performance of 2D structure was theoretically manifested. Therefore, demonstrating that similar mechanisms can be used to explore other 2D oxides aspossible efficient stable electrocatalyst substitute for energy conversion.
Effect of Precipitate Characteristics on the Corrosion Behavior of a AZ80 Magnesium Alloy
Dhananjay Dubey,Kondababu Kadali,Harikrishna Kancharla,Anuz Zindal,Jayant Jain,K. Mondal,Sudhanshu S. Singh 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
In this study, a systematic investigation on the effect of both aging temperature (250 °C and 330 °C) and time (chosen basedon aging curves) on the distribution and volume fraction of the Mg17Al12precipitates and subsequently on the corrosionbehavior of the AZ80 magnesium alloy was carried out by conducting both immersion and dynamic polarization test in afreely aerated 3.5% NaCl solution. The analysis of corrosion products using Raman spectroscopy and X-ray diffraction andinvestigation of corrosion morphologies using scanning electron microscopy suggested galvanic corrosion of the anodicα-Mg matrix in contact with the cathodic Mg17Al12precipitates. The higher corrosion resistance of the alloy aged at lowertemperature (250 °C) was attributed to the higher number density of the Mg17Al12precipitates than that at higher temperature(330 °C). In the peak aged condition, the average number densities of precipitates (1/μm2) were measured to be ~ 0.74and ~ 0.32 and average corrosion rates (mm/y) were measured to be ~ 3.0 and ~ 5.0 at the aging temperatures of 250 °Cand 330 °C, respectively. At a particular aging temperature, the corrosion resistance increased to a maximum at peak-agedcondition followed by a decline in the over-aged condition and further increase with prolong aging, which was correlatedwith the number density, size and distribution of the Mg17Al12precipitates.
Sadashiv,Anupama Modi,Manoj Khokhar,Praveen Sharma,Rajnish Joshi,Sudhanshu Shekhar Mishra,Rajay N Bharshankar,Sunita Tiwari,Pankaj Kumar Singh,Vivek Vidyadhar Bhosale,Mahendra Pal Singh Negi 대한비만학회 2021 The Korean journal of obesity Vol.30 No.3
Background: It is well established that obesity is a major health risk in diabetes and associated diseases. Epigenetic changes, specially DNA methylation, play an important role in regulation of adipokines. The objective of the present study was to evaluate the DNA methylation status at the promoter region of the leptin gene in obese individuals and its association with metabolic risk factors. Methods: The study included obese (n=100) and non-obese (n=75) individuals aged 25–45 years, and measured their physical, biochemical parameters (glucose, insulin, and lipid profiles) and leptin, DNA methyltransferase 1 (DNMT1), and DNA methyltransferase 3 beta (DNMT3b) mRNA expressions with real-time reverse transcription-polymerase chain reaction (qRT-PCR). DNA methylation of the leptin gene at the promoter region was analyzed by methyl-specific qPCR . Results: The study found that the DNA methylation level at the promoter area of the leptin gene was negatively associated with weight in obese subjects. Furthermore, study findings showed that the DNA methylation level was negatively associated with fasting insulin, glucose, homeostatic model assessment for insulin resistance, and total cholesterol. There was also a higher expression of DNMT1 and DNMT-3b in obese subjects as compared with non-obese subjects. Conclusion: The leptin epigenetic profile may be associated with obesity and its associated metabolic risk factors.