Indian Institute of Technology Indore

About: Indian Institute of Technology Indore is a education organization based out in Indore, Madhya Pradesh, India. It is known for research contribution in the topics: Fading & Support vector machine. The organization has 1606 authors who have published 4803 publications receiving 66500 citations.

Effect of flexoelectricity on the electromechanical response of graphene nanocomposite beam

Abstract: Owing to its unique multifunctional and scale-dependent physical properties, graphene is emerged as promising reinforcement to enhance the overall response of nanotailored composite materials. Most recently, the piezoelectricity phenomena in graphene sheets was found through interplay between different non-centrosymmetric pores, curvature and flexoelectricity phenomena. This has added new multifunctionality to existing graphene and it seems the use of piezoelectric graphene in composites has yet to be fully explored. In this article, the mechanics of materials and finite element models were developed to predict the effective piezoelectric and elastic (piezoelastic) properties of the graphene reinforced nanocomposite material (GRNC). An analytical model based on the linear piezoelectricity and Euler beam theories was also developed to investigate the electromechanical response of GRNC cantilever beam under both electrical and mechanical loads accounting the flexoelectric effect. Furthermore, molecular dynamics simulations were carried out to determine the elastic properties of graphene which were used to develop the analytical and numerical models herein. The current results reveal that the flexoelectric effect on the elastic behavior of bending of nanocomposite beams is significant. The electromechanical behavior of GRNC cantilever beam can be tailored to achieve the desired response via a number of ways such as by varying the volume fraction of graphene layer and the application of electrical load. Our fundamental study highlights the possibility of developing lightweight and high performance piezoelectric graphene based nanoelectromechanical systems such as sensors, actuators, switches and smart electronics as compared with the existing heavy, brittle and toxic piezoelectric materials.

Measurement of beauty and charm production in pp collisions at $$ \sqrt{s} $$ = 5.02 TeV via non-prompt and prompt D mesons

Abstract: The pT-differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity (|y| < 0.5) in proton-proton collisions at $$ \sqrt{s} $$ = 5.02 TeV. The data sample used in the analysis corresponds to an integrated luminosity of (19.3 ± 0.4) nb−1. D mesons were reconstructed from their decays D0 → K−π+, D+ → K−π+π+, and $$ {\mathrm{D}}_{\mathrm{s}}^{+}\to \upphi {\uppi}^{+}\to {\mathrm{K}}^{-}{\mathrm{K}}^{+}{\uppi}^{+} $$ and their charge conjugates. Compared to previous measurements in the same rapidity region, the cross sections of prompt D+ and $$ {\mathrm{D}}_{\mathrm{s}}^{+} $$ mesons have an extended pT coverage and total uncertainties reduced by a factor ranging from 1.05 to 1.6, depending on pT, allowing for a more precise determination of their pT-integrated cross sections. The results are well described by perturbative QCD calculations. The fragmentation fraction of heavy quarks to strange mesons divided by the one to non-strange mesons, fs/(fu + fd), is compatible for charm and beauty quarks and with previous measurements at different centre-of-mass energies and collision systems. The $$ \mathrm{b}\overline{\mathrm{b}} $$ production cross section per rapidity unit at midrapidity, estimated from non-prompt D-meson measurements, is $$ \mathrm{d}{\sigma}_{\mathrm{b}\overline{\mathrm{b}}}/\mathrm{d}y\left|{}_{\left|\mathrm{y}\right|<0.5}=34.5\pm 2.4{\left(\mathrm{stat}\right)}_{-2.9}^{+4.7}\left(\mathrm{tot}.\mathrm{syst}\right)\right. $$ μb. It is compatible with previous measurements at the same centre-of-mass energy and with the cross section pre- dicted by perturbative QCD calculations.

An Experimental Study on the Rewetting of a Hot Vertical Surface by Circular Water Jet Impingement

Abstract: The present experimental study analyzes the rewetting behavior of a hot vertical stainless-steel foil by a circular impinging liquid jet. The transient temperature of the hot foil, recorded by an infrared camera, is used to evaluate the rewetting velocity and heat flux distribution. The rewetting velocity varies within 2.0–20.0 cm/sec. Maximum surface heat flux is highest at the stagnation point and reduces in the downstream direction. A correlation for the rewetting velocity is developed that predicts 85% of test data within an error band of ± 30%. Present results agree well with the available theoretical models and test data.

Controlled Zn1−xNixO nanostructures for an excellent humidity sensor and a plausible sensing mechanism

Abstract: Here, we report on the chemi-resistive humidity sensing behavior of a Zn1−xNixO nanomaterial synthesized using a wet chemical method. At room temperature, the x = 0.10 sample shows excellent humidity sensitivity of 152% and a response/recovery time of 27/3 s within the 33–97% relative humidity (RH) range. The experimental data observed over the entire range of RH values can be well-fitted to a Freundlich adsorption isotherm model, which reveals two distinct water adsorption regimes. The obtained results suggest that the x = 0.10 sample has the highest adsorption strength. Theoretical humidity detection limits for the x = 0, 0.05 and 0.10 samples are found to be about 7.24% RH, 6.31% RH and 3.71% RH, respectively. The excellent humidity sensing observed using the ZnO and Ni doped ZnO nanostructures is attributed to a Grotthuss mechanism, considering the distribution of available adsorption sites. Therefore, Ni doped ZnO nanostructures synthesized via employing an economical wet chemical technique demonstrate promising capabilities to act as potential candidates for the fabrication of next-generation humidity sensors.