Belur, India

Ramakrishna Mission Vivekananda University is a university that is administered by the Ramakrishna Mission. It was declared by Government of India as a Deemed University under Section 3 of UGC Act, 1956. It has four campuses in Belur, Coimbatore, Ranchi and Narendrapur.The university was given the status of a deemed university in July 2005. It provides courses on subjects as varied as rural and tribal development, disability management and special education, fundamental science education and Indian cultural and spiritual heritage.The university's School of Mathematical Science started its academic activities in July 2008. The classes are conducted at the main campus of the university at Belur and at Vivekananda Research Centre, the ancestral house of Swami Vivekananda in Kolkata.The university is also conducting these courses at its specialized faculty centers throughout the country. Other unconventional areas that the university is engaged in are disability management and special education at Coimbatore, integrated rural development including tribal development and management at its centers in Ranchi and Narendrapur. Wikipedia.

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Texas Tech University and Ramakrishna Mission Vivekananda University | Date: 2015-06-18

The present invention determines one or more properties of a soil sample by scanning a soil sample using a visible near infrared diffuse reflectance diffuse reflectance (VisNIR) spectroradiometer, scanning the soil sample using a x-ray fluorescence (PXRF) spectrometer, receiving a diffuse reflectance spectra from the VisNIR spectroradiometer and an elemental data from the PXRF spectrometer, determining one or more properties of the soil sample using one or more processors and a predictive model that relates the diffuse reflectance spectra and the elemental data to the one or more properties, and providing the one or more properties of the soil sample to one or more input/output interface.

Sharma A.,Texas Tech University | Weindorf D.C.,Texas Tech University | Wang D.,Nanjing University of Information Science and Technology | Chakraborty S.,Ramakrishna Mission Vivekananda University
Geoderma | Year: 2015

Soil cation exchange capacity (CEC) is an important measure of soil fertility, owing to the large number of plant essential nutrients which are taken up by plants as cations. However, current methods for evaluating soil CEC are arduous and require analysis in a laboratory. Portable X-ray fluorescence (PXRF) spectrometry is a proximal sensing technique which provides elemental data in-situ, in seconds. This study examined the potential of using PXRF for soil CEC prediction by evaluating 450 soil samples from California and Nebraska, USA representing a wide variety of soil textures found in active farm fields. Multiple linear regression was applied to a modeling dataset to establish the relationship between lab-determined CEC and PXRF elemental data. A second model also included auxiliary input data (soil clay, pH, organic matter) as potential modeling variables. Both models were shown to perform similarly, with the auxiliary input model providing slightly higher R2 (0.926 vs. 0.908) and slightly lower RMSEs (2.236 vs. 2.498) compared to pure elemental data models. Independent validation datasets were compelling for both pure elemental models (0.904) and auxiliary input models (0.953). Summarily, PXRF was able to predict soil CEC accurately, thereby minimizing the need for lab-based CEC data for many applications. © 2014 Elsevier B.V.

Gangopadhyay D.,Ramakrishna Mission Vivekananda University | Home D.,Bose Institute of India | Roy A.S.,Ramakrishna Mission Vivekananda University
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

The Leggett-Garg inequality (LGI) as a temporal analog of Bell's inequality, derived using the notion of realism, is studied in a hitherto unexplored context involving weak-interaction-induced two-state oscillations of decaying neutral kaons and neutrinos. The maximum violation of the LGI obtained from the relevant quantum mechanical results is significantly higher for oscillating neutrinos compared to that for kaons. Interestingly, the effect of CP noninvariance for the kaon oscillation is to enhance this violation, while, for neutrinos, the violation is sensitive to the value of mixing parameter. © 2013 American Physical Society.

Aldabaa A.A.A.,Desert Research Center | Weindorf D.C.,Texas Tech University | Chakraborty S.,Ramakrishna Mission Vivekananda University | Sharma A.,Texas Tech University | Li B.,Louisiana State University
Geoderma | Year: 2015

Salt affected soils are pervasive in semiarid and arid regions worldwide. Traditionally, soil salinity has been measured via electrical conductivity (EC). This study evaluated the feasibility of using three different methods for prediction of surface soil salinity, namely visible near infrared diffuse reflectance spectroscopy (VisNIR DRS), portable x-ray fluorescence (PXRF) spectrometry, and remote sensing (RS). Two saline playas were evaluated in West Texas, USA featuring 91 and 74 soils collected via random stratified sampling at 0-5cm and representing a wide variety of soil salinity from high levels inside the playa bottoms to lower levels on the annulus and surrounding uplands. Samples were subjected to PXRF and VisNIR DRS scanning under laboratory conditions, and compared to Landsat spectral data and traditional laboratory analyses of salinity (e.g., 1:5 v/v suspensions). Results showed a broad range of EC (1:5) (0.028 to 43.41dSm-1). Derived from PXRF, both Cl and S were significantly and positively correlated with log10 transformed EC (1:5). VisNIR partial least squares prediction models produced strong residual prediction deviations (RPDs) of 2.49-2.91. Validation statistics of Savitzky-Golay support vector regression outperformed all other VisNIR models tested with an RPD of 3.1. The model using Landsat band reflectance alone produced lowest prediction accuracy (RPD=1.27). While the performance of each technique produced variable success independently, combining the three techniques produced the highest predictability (RPD=3.35). Given that, laboratory determination of EC (1:5) is time consuming and all three types of data (VisNIR DRS, PXRF, and RS) are being quick and easy to collect, their synthesis in predictive models offers excellent potential for providing soil salinity measurements comparable to standard, laboratory derived data. Furthermore, remotely sensed data can potentially be used to map topsoil salinity across large areas with suitable calibrations. © 2014 The Authors. Published by Elsevier B.V.

Samanta A.,Ramakrishna Mission Vivekananda University | Samanta A.,Abdus Salam International Center For Theoretical Physics | Smirnov A.Yu.,Abdus Salam International Center For Theoretical Physics
Journal of High Energy Physics | Year: 2011

We study dependence of the atmospheric νμ and νμ uxes on the deviations of the 2-3 mixing from maximal, |45°-θ23|, on the θ23-octant and on the neutrino mass splitting Δm 32 2. Analytic expressions for the θ23- deviation e ect and the octant asymmetry are derived. We present conservative estimations of sensitivities of the iron (magnetized) calorimeter detectors (ICAL) to these parameters. ICAL can establish the θ23- deviation at higher than 3σ confidence level if |45°- θ23 < 6° with the exposure of 1 Mton·yr. Sensitivity to the octant is low for zero or very small 1-3 mixing, but it can be substantially enhanced for θ13 3°. ICAL can measure the di erence of Delta;m32 2 in ν and ν channels (the CPT test) with accuracy 0:8×10-4 eV2 (3σ) with 1 Mton·yr exposure, and the present MINOS result can be excluded at < 5σ confidence level. We discuss possible ways to further improve sensitivity of the magnetized spectrometers. © SISSA 2011.

Bhattacharyya S.,Ramakrishna Mission Vivekananda University | Bhattacharyya S.,Indian Institute of Technology Kanpur
Journal of High Energy Physics | Year: 2014

Existence of an entropy current with non-negative divergence puts a lot of constraints on the transport coefficients of a fluid, so does the existence of equilibrium. In all the cases we have studied so far we have seen an overlap between these two sets of constraints. In this note we shall try to explore the reason for such an overlap. We shall also see how a part of the entropy current could be determined from the equilibrium partition function. © 2014, The Author(s).

Sen S.,Visva Bharati | Mandal P.,Visva Bharati | Mukherjee P.K.,Visva Bharati | Mukherjee P.K.,Ramakrishna Mission Vivekananda University
Physics of Plasmas | Year: 2012

Pilot calculations on the hyperpolarizability of He, the first neutral member of the two electron sequence, have been performed under spherical confinement with a view to analyse the effect of pressure on such non linear optical properties. Detailed investigations have also been performed for the first time on the hyperpolarizability due to the effect of screened Coulomb potential obtained from a surrounding Debye plasma environment. Variation perturbation theory within coupled Hartree-Fock scheme has been adopted to estimate the non linear optical properties under such external confinement. For a given plasma coupling strength, the hyperpolarizability value is found to reduce systematically with decrease of radius of confinement, while the same is found to increase continuously with increasing plasma coupling strength determined by gradual enhancement of the screening parameter for a given radius of confinement. Under strong confinement the hyperpolarizability value is found to be negative. The estimated free atom hyperpolarizability is consistent with the existing coupled Hartree-Fock result. © 2012 American Institute of Physics.

Majumdar P.,Ramakrishna Mission Vivekananda University
Pramana - Journal of Physics | Year: 2016

Cosmological implications on the polarization of the cosmic microwave background radiation, of a Kalb-Ramond field interacting with gauge fields and gravity as dictated by quantum consistency of heterotic string theory are surveyed. A parity violating augmentation going beyond the dictates of string theory is shown to lead to possible appearance of a B mode generated in the cosmic microwave background (CMB) in the post-last scattering epoch. This generation of the B mode of CMB appears to be dramatic when the augmentation is embedded within a Randall- Sundrum braneworld scenario of the first kind. © Indian Academy of Sciences.

Chakraborty C.,Saha Institute of Nuclear Physics | Majumdar P.,Ramakrishna Mission Vivekananda University
Classical and Quantum Gravity | Year: 2014

An exact expression derived in the literature for the rate of dragging of inertial frames (Lense-Thirring (LT) precession) in a general stationary spacetime, is reviewed. The exact LT precession frequencies for Kerr, Kerr-Taub-NUT (Newman-Unti-Tamburino) and Taub-NUT spacetimes are explicitly derived. Remarkably, in the case of the zero angular momentum Taub-NUT spacetime, the frame-dragging effect is shown not to vanish, when considered for spinning test gyroscopes. The result becomes sharper for the case of vanishing ADM mass of that spacetime. We clarify how our results are consistent with claims in the recent literature of null orbital plane precession for NUT spacetimes. © 2014 IOP Publishing Ltd.

Majhi A.,Saha Institute of Nuclear Physics | Majumdar P.,Ramakrishna Mission Vivekananda University
Classical and Quantum Gravity | Year: 2014

We articulate the fact that the loop quantum gravity (LQG) description of the quantum macrostates of black hole horizons, modeled as quantum isolated horizons (QIHs), is completely characterized in terms of two independent integer-valued 'quantum hairs', viz, the coupling constant (k) of the quantum SU (2) Chern-Simons (CS) theory describing QIH dynamics, and the number of punctures N ( ) produced by the bulk spin network edges piercing the isolated horizon (which act as pointlike sources for the CS fields). We demonstrate that the microcanonical entropy of macroscopic (both parameters assuming very large values) QIHs can be obtained directly from the microstates of this CS theory using standard statistical mechanical methods, without having to additionally postulate the horizon as an ideal gas of punctures, or incorporate any additional classical or semiclassical input from general relativity vis-a-vis the functional dependence of the isolated horizon mass on its area, or indeed, without having to restrict to any special class of spins. Requiring the validity of the Bekenstein-Hawking area law relates these two parameters (as an equilibrium 'equation of state'), and consequently allows the Barbero-Immirzi parameter to take any real and positive value depending on the value of k N. The logarithmic correction to the area law obtained a decade ago by R Kaul and one of us (PM), ensues straightforwardly, with precisely the coefficient ?3 2, making it a signature of the LQG approach to black hole entropy. © 2014 IOP Publishing Ltd.

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