Indian Institute of Technology Bhubaneswar

About: Indian Institute of Technology Bhubaneswar is a education organization based out in Bhubaneswar, India. It is known for research contribution in the topics: Large Hadron Collider & Higgs boson. The organization has 1185 authors who have published 3132 publications receiving 48832 citations.

Optimization of vibratory welding process parameters using response surface methodology

Abstract: The current investigation was carried out to study the effect of vibratory welding technique on mechanical properties of 6 mm thick butt welded mild steel plates A new concept of vibratory welding technique has been designed and developed which is capable to transfer vibrations, having resonance frequency of 300 Hz, into the molten weld pool before it solidifies during the Shielded metal arc welding (SMAW) process The important process parameters of vibratory welding technique namely welding current, welding speed and frequency of the vibrations induced in molten weld pool were optimized using Taguchi’s analysis and Response surface methodology (RSM) The effect of process parameters on tensile strength and hardness were evaluated using optimization techniques Applying RSM, the effect of vibratory welding parameters on tensile strength and hardness were obtained through two separate regression equations Results showed that, the most influencing factor for the desired tensile strength and hardness is frequency at its resonance value, ie 300 Hz The micro-hardness and microstructures of the vibratory welded joints were studied in detail and compared with those of conventional SMAW joints Comparatively, uniform and fine grain structure has been found in vibratory welded joints

Search for a heavy resonance decaying into a Z boson and a vector boson in the v(v)over-barq(q)over-bar final state

Abstract: A search is presented for a heavy resonance decaying into either a pair of Z bosons or a Z boson and a W boson (ZZ or WZ), with a Z boson decaying into a pair of neutrinos and the other boson decaying hadronically into two collimated quarks that are reconstructed as a highly energetic large-cone jet. The search is performed using the data collected with the CMS detector at the CERN LHC during 2016 in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to a total integrated luminosity of 35.9 fb−1. No excess is observed in data with regard to background expectations. Results are interpreted in scenarios of physics beyond the standard model. Limits at 95% confidence level on production cross sections are set at 0.9 fb (63 fb) for spin-1 W′ bosons, included in the heavy vector triplet model, with mass 4.0 TeV (1.0 TeV), and at 0.5 fb (40 fb) for spin-2 bulk gravitons with mass 4.0 TeV (1.0 TeV). Lower limits are set on the masses of W′ bosons in the context of two versions of the heavy vector triplet model of 3.1TeV and 3.4 TeV, respectively.

Effects of dimethyl sulfoxide on the hydrogen bonding structure and dynamics of aqueous N-methylacetamide solution

Abstract: Effects of dimethyl-sulfoxide (DMSO) on the hydrogen bonding structure and dynamics in aqueous N-methylacetamide (NMA) solution are investigated by classical molecular dynamics simulations. The modifications of structure and interaction between water and NMA in presence of DMSO molecules are calculated by various site-site radial distribution functions and average interaction energies between these species in the solution. It is observed that the aqueous peptide hydrogen bond interaction is relatively stronger with increasing concentration of DMSO, whereas methyl-methyl interaction between NMA and DMSO decreases significantly. The DMSO molecule prefers to interact with amide-hydrogen of NMA even at lower DMSO concentration. The lifetimes and structural-relaxation times of NMA-water, water-water and DMSO-water hydrogen bonds are found to increase with increasing DMSO concentration in the solution. The slower translational and rotational dynamics of NMA is observed in concentrated DMSO solution due to formation of stronger inter-species hydrogen bonds in the solution.

Dispersion Relation Preserving Combined Compact Difference Schemes for Flow Problems

Abstract: In this work, we have proposed two new combined compact difference (CCD) schemes for the solution of Navier---Stokes equations. These spatial discretization schemes have not only high spectral resolution for obtaining first and second derivative terms, but also have improved dispersion relation preserving properties when the fourth-order four-stage Runge---Kutta scheme is used for time integration. Out of the two proposed CCD schemes, the first scheme has upwind stencil, while the second scheme has a central stencil. Important numerical properties of these schemes have been analyzed and their effectiveness have been shown by solving the model wave equations, as well as Navier---Stokes equations. Results show that the upwind CCD scheme is suitable for high accuracy large eddy simulation of transitional and turbulent flowfields.