Biography:

In the past K. Sengupta has collaborated on articles with P.L. Jain and H. Kanchi. One of their most recent publications is Cognitive feedback in environments characterized by irrelevant information. Which was published in journal Omega.

More information about K. Sengupta research including statistics on their citations can be found on their Copernicus Academic profile page.

K. Sengupta's Articles: (8)

Cognitive feedback in environments characterized by irrelevant information

AbstractResearch in human information processing demonstrates that the presence of irrelevant information has an adverse effect on the quality of decisions. Decision makers are unable to identify and separate the effect of irrelevant information, thereby reducing the quality of decisions. The propensity to overutilize irrelevant information is significant because present day work environments are increasingly rich in information. This study examines the comparative efficacies of two types of information—cognitive feedback and outcome feedback—in identifying irrelevant information and thereby improving decision quality. Outcome feedback is information on the accuracy of a decision. Cognitive feedback is information on the how and why underlying the accuracy. The results show that subjects provided with cognitive feedback attained significantly better identification of irrelevant information than those relying solely on outcome feedback. The use of cognitive feedback also resulted in greater accuracy and cognitive control. We discuss the implications of the results for designing decision support systems and for research in decision aiding.

Intermittency in multiparticle production at ultra-relativistic heavy ion collisions

AbstractScaled factorial moments were calculated for multiplicity distributions in the pseudorapidity intervals of secondary particles produced by the interactions of 16O beams at 60 and 200 GeV/n, 32S at 200 GeV/n and protons at 800 GeV/c in nuclear emulsion. The extracted moments exhibit a power-law dependence on the pseudorapidity bin size, which is consistent with intermittent behavior. At a given incident energy, the intermittency strength decreases with the increase in multiplicity.

Effect of hybridization on superconductivity in quasi-two-dimensional systems

AbstractThe effects of hybridization and the presence of the van Hove singularity in the density of state on superconductivity in a two-band model are studied within the framework of the BCS theory. The gap parameter and the critical temperature are non-zero below a critical value of the hybridization strength, which depends strongly on the charge transfer energy gap. These quantities reach their maximum values when the Fermi level coincides with the van Hove singularity.

Hadron production by 150 GeV muons in nuclear emulsion☆

AbstractThis paper reports measurements of the hadrons produced in the inelastic scattering of 150 GeV positive muons in nuclear emulsion. Multiplicity distributions of secondary particles are given and are compared with the results of pion and proton interactions in emulsion at different energies. We find similarities as well as differences between muon and hadron collisions with nuclei.

Effect of turbulent inflow boundary condition in LES of flow over a backward-facing step using spectral element method☆

AbstractThe prescription of turbulent inflow boundary condition for large-eddy simulation (LES) is critical to obtain accurate predictions. In this paper, a stochastic model for generating inflow turbulence is implemented and compared to the method of generating inflow turbulence with random fluctuations. The LES studies of the effect of inflow boundary conditions are performed using a semi-implicit Legendre spectral element method. Two different backward-facing step configurations are simulated at Reynolds numbers 5000 and 28,000 utilizing the technique of implicit LES with no sub-grid model. Frequency analysis is performed at various points in the boundary layer and in the shear layer to study the effect of inflow boundary condition. The spectral method requires correlated velocity input data generated by the stochastic model for predicting the correct transition to turbulence at Re = 5000, while the random fluctuations predict a delayed transition to turbulence. At Re = 28,000, the two techniques of generating inflow turbulence give similar results. In addition, it is also observed that at Re = 5000, the semi-implicit method requires small time step size to correctly predict transition to turbulence. The large time step size leads to laminarization of the flow in the inlet channel. This effect of the time step size is not observed in the case of Re = 28,000.

Measurement of charge of heavy ions in emulsion using a CCD camera

AbstractA system has been developed for semi-automated determination of the charges of heavy ions recorded in nuclear emulsions. The profiles of various heavy ion tracks in emulsion, both accelerator beam ions and fragments of heavy projectiles, were obtained with a CCD camera mounted on a microscope. The dependence of track profiles on illumination, emulsion grain size and density, background in emulsion, and track geometry was analyzed. Charges of the fragments of heavy projectiles were estimated independently by the delta ray counting method. A calibration of both width and height of track profiles against ion charges was made with ions of known charges ranging from helium to gold nuclei.

How to detect edge electron states in (TMTSF)2X and Sr2RuO4 experimentally☆

AbstractWe discuss a number of experiments that could detect the electron edge states in the organic quasi-one-dimensional conductors (TMTSF)2X and the inorganic quasi-two-dimensional perovskites Sr2RuO4. We consider the chiral edges states in the magnetic-field-induced spin-density-wave (FISDW) phase of (TMTSF)2X and in the time-reversal-symmetry-breaking triplet superconducting phase of Sr2RuO4, as well as the nonchiral midgap edge states in the triplet superconducting phase of (TMTSF)2X. The most realistic experiment appears to be an observation of spontaneous magnetic flux at the edges of Sr2RuO4 by a scanning SQUID microscope.

Superfluid to Mott-insulator transition of cold atoms in optical lattices

AbstractWe review the superfluid (SF) to Mott-insulator (MI) transition of cold atoms in optical lattices. The experimental signatures of the transition are discussed and the random-phase-approximation (RPA) theory of the Bose–Hubbard model briefly described. We point out that the critical behavior at the transition, as well as the prediction by the RPA theory of a gapped mode (besides the Bogoliubov sound mode) in the SF phase, is difficult to understand from the Bogoliubov theory. On the other hand, these findings appear to be intimately connected to the non-trivial infrared behavior of the SF phase as recently studied within the non-perturbative renormalization group.

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