Results for "Nigar Sultana"

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On the solution of the variational optimisation in the rational inattention frameworkFeb 27 2018Jul 18 2018I analyse the solution method for the variational optimisation problem in the rational inattention framework proposed by Christopher A. Sims. The solution, in general, does not exist, although it may exist in exceptional cases. I show that the solution ... More
An optimal local model to practically emulate Bell inequalitiesFeb 08 2019We show how an adversary can emulate a Bell inequality using existing detector control methods if the Bell test is not loophole-free. For a Clauser-Horne-Shimony-Holt inequality, our model fakes a maximum violation predicted by quantum mechanics for a ... More
The $R_{\mathrm{h}}=ct$ universe and quintessenceJan 20 2016Over the last few years the $R_{\mathrm{h}}=ct$ universe has received a lot of attention, particularly when observational evidence seems to favor this over the standard $\Lambda$ cold dark matter ($\Lambda CDM$) universe. Like the $\Lambda CDM$, the $R_{\mathrm{h}}=ct$ ... More
Weighted Impact Factor (WIF) for assessing the quality of scientific journalsJun 09 2015Nowadays impact factor is the significant indicator for journal evaluation. In impact factor calculation is used number of all citations to journal, regardless of the prestige of cited journals, however, scientific units (paper, researcher, journal or ... More
The Iron Project and Non-LTE stellar modelingJul 10 2002Latest developments in theoretical computations since the international Opacity Project (OP), under the new the Iron Project (IP) and extensions, are described for applications to a variety of objects such as stellar atmospheres, nebulae, and active galactic ... More
Photoionization and RecombinationMar 27 2000Theoretically self-consistent calculations for photoionization and (e + ion) recombination are described. An identical eigenfunction expansion for the ion is employed in coupled channel calculations for both processes, thus ensuring consistently accurate ... More
Update report: LEO-II version 1.5Mar 15 2013May 14 2013Recent improvements of the LEO-II theorem prover are presented. These improvements include a revised ATP interface, new translations into first-order logic, rule support for the axiom of choice, detection of defined equality, and more flexible strategy ... More
Self-consistent ab initio calculations for photoionization and electron-ion recombination using the R-matrix methodJul 10 2002Most astrophysical plasmas entail a balance between ionization and recombination. We present new results from the powerful R-matrix method which yields in an ab initio manner: (I) self-consistent photoionization and recombination cross sections using ... More
Relativistic photoionization cross sections for C IIJun 20 2001Jun 21 2001High resolution measurements of photoionization cross sections for atomic ions are now being made on synchrotron radiation sources. The recent measurements by Kjeldsen etal. (1999) showed good agreement between the observed resonance features and the ... More
Airborne demonstration of a quantum key distribution receiver payloadDec 19 2016Jun 09 2017Satellite-based quantum terminals are a feasible way to extend the reach of quantum communication protocols such as quantum key distribution (QKD) to the global scale. To that end, prior demonstrations have shown QKD transmissions from airborne platforms ... More
Thermodynamic Geodesics of a Reissner Nordström Black HoleSep 23 2016Starting from a Geometrothermodynamics metric for the space of thermodynamic equilibrium states in the mass representation, we use numerical techniques to analyse the thermodynamic geodesics of a supermassive Reissner Nordstr\"om black hole in isolation. ... More
Relativistic fine structure oscillator strengths for Li-like ions: C IV - Si XII, S XIV, Ar XVI, Ca XVIII, Ti XX, Cr XXII, and Ni XXVIJul 10 2002Ab initio calculations including relativistic effects employing the Breit-Pauli R-matrix (BPRM) method are reported for fine structure energy levels and oscillator strengths upto n = 10 and 0.leq. l .leq.9 for 15 Li-like ions: C IV, N V, O VI, F VII, ... More
Atomic Processes in Planetary NebulaeFeb 19 2002A hot central star illuminating the surrounding ionized H II region usually produces very rich atomic spectra resulting from basic atomic processes: photoionization, electron-ion recombination, bound-bound radiative transitions, and collisional excitation ... More
Photoionization cross sections of O II, O III, O IV, and O V: benchmarking R-matrix theory and experimentsNov 04 2003For crucial tests between theory and experiment, ab initio close coupling calculations are carried out for photoionization of O II, O III, O IV, O V. The relativistic fine structure and resonance effects are studied using the R-matrix and its relativistic ... More
Atomic data from the Iron Project XLV. Relativistic transition probabilities for carbon-like Ar XIII and Fe XXI using Breit-Pauli R-matrix methodAug 01 2000The Breit-Pauli R-matrix method developed under the Iron Project has been used to obtain extensive sets of oscillator strengths and transition probabilities for dipole allowed and intercombination fine structure transitions in carbon like ions, Ar XIII ... More
The Problem of Inertia in Friedmann UniversesApr 07 2011In this paper we study the origin of inertia in a curved spacetime, particularly the spatially flat, open and closed Friedmann universes. This is done using Sciama's law of inertial induction, which is based on Mach's principle, and expresses the analogy ... More
CMC tori of revolution in $\mathbb{S}^3$: additional data on the spectra of their Jacobi operatorsApr 23 2008We prove a theorem about elliptic operators with symmetric potential functions, defined on a function space over a closed loop. The result is similar to a known result for a function space on an interval with Dirichlet boundary conditions. These theorems ... More
Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements VIII. Ar XIII with new featuresSep 22 2004Ar XIII is found to be unique with new features in electron-ion recombination not seen in any other ion. The ion has been studied with the unified method which provides a theoretically self-consistent set of atomic parameters for the inverse processes ... More
Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. IX. Ni XXVI and Ni XXVII for UV and X-ray modelingMar 08 2005The inverse processes of photoionization and electron-ion recombination of (hnu + Ni XXVI --> Ni XXVII + e and (hnu + Ni XXVII --> Ni XXVIII + e) are studied using the unified method for the total recombination. The method subsumes both the radiative ... More
A no-hair theorem for spherically symmetric black holes in $R^2$ gravityOct 06 2018In a recent paper Ca\~nate (CQG, {\bf 35}, 025018 (2018)) proved a no hair theorem to static and spherically symmetric or stationary axisymmetric black holes in general $f(R)$ gravity. The theorem applies for isolated asymptotically flat or asymptotically ... More
Morse index of constant mean curvature tori of revolution in the 3-sphereMay 04 2006We compute lower bounds for the Morse index and nullity of constant mean curvature tori of revolution in the three-dimensional unit sphere. In particular, all such tori have index at least five, with index growing at least linearly with respect to the ... More
Derived Functor Cohomology Groups with Yoneda ProductMar 29 2019This work presents an exposition of both the internal structure of derived category of an abelian category D*(A) and its contribution in solving problems, particularly in algebraic geometry. Calculation of some morphisms will be presented between objects ... More
Illumination Invariant Foreground Object Segmentation using ForeGANsFeb 07 2019Apr 05 2019The foreground segmentation algorithms suffer performance degradation in the presence of various challenges such as dynamic backgrounds, and various illumination conditions. To handle these challenges, we present a foreground segmentation method, based ... More
Thermodynamic Geodesics of a Reissner Nordström Black HoleSep 23 2016Oct 13 2016Starting from a Geometrothermodynamics metric for the space of thermodynamic equilibrium states in the mass representation, we use numerical techniques to analyse the thermodynamic geodesics of a supermassive Reissner Nordstr\"{o}m black hole in isolation. ... More
Illumination Invariant Foreground Object Segmentation using ForeGANsFeb 07 2019The foreground segmentation algorithms suffer performance degradation in the presence of various challenges such as dynamic backgrounds, and various illumination conditions. To handle these challenges, we present a foreground segmentation method, based ... More
The Effects of Spatial Curvature on Cosmic EvolutionJul 17 2019As evidenced by a great number of works, it is common practice to assume that the Universe is flat. However, the majority of studies which make use of observational data to constrain the curvature density parameter are premised on the $\Lambda$CDM cosmology, ... More
Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements VI. Ni IIFeb 12 2001We present the first detailed ab initio quantum mechanical calculations for total and state-specific recombination rate coefficients for e + Ni III --> Ni II. These rates are obtained using a unified treatment for total electron-ion recombination that ... More
Android based security and home automation systemMar 28 2015The smart mobile terminal operator platform Android is getting popular all over the world with its wide variety of applications and enormous use in numerous spheres of our daily life. Considering the fact of increasing demand of home security and automation, ... More
Luminosity correlations for gamma-ray bursts and implications for their prompt and afterglow emission mechanismsAug 08 2012Aug 12 2012We present the relation between the ($z-$ and $k-$corrected) spectral lags, $\tau$, for the standard Swift energy bands 50-100 keV and 100-200 keV and the peak isotropic luminosity, $L_{\mathrm{iso}}$ (a relation reported first by Norris et al.), for ... More
Atomic Data: Division B / Commission 14 / Working Group Atomic DataOct 29 2015This report summarizes laboratory measurements of atomic wavelengths, energy levels, hyperfine and isotope structure, energy level lifetimes, and oscillator strengths. Theoretical calculations of lifetimes and oscillator strengths are also included. The ... More
Oblique propagation of arbitrary amplitude electron acoustic solitary waves in magnetized kappa-distributed plasmasJun 29 2012The linear and nonlinear properties of large amplitude electron-acoustic waves are investigated in a magnetized plasma comprising two distinct electron populations (hot and cold) and immobile ions. The hot electrons are assumed to be in a non-Maxwellian ... More
Advancements in Image Classification using Convolutional Neural NetworkMay 08 2019Convolutional Neural Network (CNN) is the state-of-the-art for image classification task. Here we have briefly discussed different components of CNN. In this paper, We have explained different CNN architectures for image classification. Through this paper, ... More
Note on the single-shock solutions of the Korteweg-de Vries-Burgers equationDec 06 2011The well-known shock solutions of the Korteweg-de Vries-Burgers equation are revisited, together with their limitations in the context of plasma (astro)physical applications. Although available in the literature for a long time, it seems to have been ... More
Data Load Balancing In Mobile Ad Hoc Network Using Fuzzy Logic (DBMF)May 28 2019Volume and movement of data rapidly increasing in every type of data communications and networking, and ad hoc networks are not spared from these challenges. Traditional Multipath routing protocols in Mobile Ad-hoc Networks (MANETs) did not focus on data ... More
A Review of Object Detection Models based on Convolutional Neural NetworkMay 05 2019May 10 2019Convolutional Neural Network (CNN) has become the state-of-the-art for object detection task. In this paper, we have explained different object detection models based on CNN. We have categorized those detection models according to two different approaches: ... More
Large enhancement in high-energy photoionization of Fe XVII and missing continuum plasma opacityJun 08 2016Aimed at solving the outstanding problem of solar opacity, and radiation transport plasma models in general, we report substantial photoabsorption in the high-energy regime due to atomic core photo-excitations not heretofore considered. In extensive R-Matrix ... More
Atomic data from the Iron Project.LVIII. New radiative transition probabilities for Fe IV including fine structureSep 08 2004We present new calculations for transition probabilities of Fe IV, with much more extensive datasets than heretofore available. The large-scale close coupling R-matrix calculations yield 1,798 LS bound states with n $\leq$ 11 and $l \leq$ 9, and corresponding ... More
Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. VII. Relativistic calculations for O VI and O VII for UV and X-ray modelingApr 10 2003Aimed at ionization balance and spectral analysis of UV and X-ray sources, we present self-consistent sets of photoionization cross sections, recombination cross sections, and rate coefficients for Li-like O VI and He-like O VII. Relativistic fine structure ... More
Self-Consistent R-matrix Approach To Photoionization And Unified Electron-Ion RecombinationOct 21 2003A unified scheme using the R-matrix method has been developed for electron-ion recombination subsuming heretofore separate treatments of radiative and dielectronic recombination (RR and DR). The ab initio coupled channel approach unifies resonant and ... More
Ellis wormhole without a phantom scalar fieldJul 22 2019In this paper, we present an exact solution for $(3+1)$-dimensional Einstein-scalar-Gauss-Bonnet theory (EsGB) in electrovacuum. The solution is characterized by only one parameter, $Q$, which in general can be associated with the electromagnetic field ... More
Electrostatic shock dynamics in superthermal plasmasDec 29 2011The propagation of ion acoustic shocks in nonthermal plasmas is investigated, both analytically and numerically. An unmagnetized collisionless electron-ion plasma is considered, featuring a superthermal (non-Maxwellian) electron distribution, which is ... More
Large-scale Breit-Pauli R-matrix calculations for transition probabilities of Fe VJan 20 2000Ab initio theoretical calculations are reported for the electric (E1) dipole allowed and intercombination fine structure transitions in Fe V using the Breit-Pauli R-matrix (BPRM) method. We obtain 3865 bound fine structure levels of Fe V and $1.46 x 10^6$ ... More
Endowing $\mathbfΛ$ with a dynamic nature: constraints in a spatially curved UniverseDec 06 2018In this study, we consider three dark energy models in which $\Lambda$ is not constant, but has a dynamic nature that depends on the Hubble parameter $H$ and/or its time derivative $\dot{H}$. We analyse the generalized running vacuum model, characterized ... More
Systematic Verification of the Modal Logic Cube in Isabelle/HOLJul 31 2015We present an automated verification of the well-known modal logic cube in Isabelle/HOL, in which we prove the inclusion relations between the cube's logics using automated reasoning tools. Prior work addresses this problem but without restriction to ... More
The supercritical pile gamma-ray burst model: The GRB afterglow steep-decline-and-plateau phaseSep 03 2013We present a process that accounts for the steep-decline-and-plateau phase of the Swift-XRT light curves, vexing features of GRB phenomenology. This process is an integral part of the "supercritical pile" GRB model, proposed a few years ago to provide ... More
Expressions of Sentiments During Code Reviews: Male vs. FemaleDec 13 2018Background: As most of the software development organizations are male-dominated, female developers encountering various negative workplace experiences reported feeling like they "do not belong". Exposures to discriminatory expletives or negative critiques ... More
A Review of Object Detection Models based on Convolutional Neural NetworkMay 05 2019Convolutional Neural Network (CNN) has become the state-of-the-art for object detection task. In this paper, we have explained different object detection models based on CNN. We have categorized those detection models according to two different approaches: ... More
Recalculation of Astrophysical Opacities: Overview, Methodology and Atomic CalculationsJan 06 2018A review of a renewed effort to recalculate astrophysical opacities using the R-Matrix method is presented. The computational methods and new extensions are described. Resulting enhancements found in test calculations under stellar interior conditions ... More
Pumping K-Alpha Resonance Fluorescence by Monochromatic X-Ray SourcesNov 29 2012We demonstrate the correspondence between theoretically calculated K-shell resonances lying below the K-edge in multiple ionization states of an element (Pradhan et al. 2009), and recently observed K-alpha resonances in high-intensity X-ray free-electron ... More
HeNet: A Deep Learning Approach on Intel$^\circledR$ Processor Trace for Effective Exploit DetectionJan 08 2018This paper presents HeNet, a hierarchical ensemble neural network, applied to classify hardware-generated control flow traces for malware detection. Deep learning-based malware detection has so far focused on analyzing executable files and runtime API ... More
The Statistics of the Prompt-to-Afterglow GRB Flux Ratios and the Supercritical Pile GRB ModelJan 06 2015We present the statistics of the ratio, ${\mathrm R}$, between the prompt and afterglow "plateau" fluxes of GRB. This we define as the ratio between the mean prompt energy flux in the {\em Swift} BAT and the {\em Swift} XRT, immediately following the ... More
Charged Cylindrical Black Holes in Conformal GravityJul 06 2012Jan 04 2013Considering cylindrical topology we present the static solution for a charged black hole in conformal gravity. We show that unlike the general relativistic case there are two different solutions, both including a factor that when set to zero recovers ... More
Collision strengths for FIR and UV transtions in PIII and the phosphorus abundanceJun 04 2018Phosphorus abundance is crucial for DNA-based extraterrestrial life in exoplanets. Atomic data for observed spectral lines of P-ions are needed for its accurate determination. We present the first calculations for collision strengths for the forbidden ... More
Relativistic close coupling calculations for photoionization and recombination of Ne-like Fe XVIIMar 12 2001Relativistic and channel coupling effects in photoionization and unified electronic recombination of Fe XVII are demonstrated with an extensive 60-level close coupling calculation using the Breit-Pauli R-matrix method. Photoionization and (e + ion) recombination ... More
Theoretical FeI/II/III Emission-Line Strengths from Active Galactic Nuclei with Broad-Line RegionsJan 09 2004We present theoretical iron emission line strengths for physical conditions typical of Active Galactic Nuclei with Broad-Line Regions. The non-local thermodynamic equilibrium (NLTE) models include a new and extensive treatment of radiative transfer in ... More
The statistics of BAT-to-XRT flux ratio in GRB: Evidence for a characteristic value and its implicationsApr 03 2015We present the statistics of the ratio, ${\cal R}$, between the prompt and afterglow "plateau" fluxes of GRB. This we define as the ratio between the mean prompt energy flux in {\em Swift} BAT and the {\em Swift} XRT one, immediately following the steep ... More
Exact Static Cylindrical Solution to Conformal Weyl GravityJan 04 2012Jun 03 2012We present the exact exterior solution for a static and neutral cylindrically symmetric source in locally conformal invariant Weyl gravity. As a special case the general relativity analogue still can be attained, however only as a sub-family of solutions. ... More
Study of a new link layer security scheme in a wireless sensor networkSep 24 2012Security of wireless sensor network (WSN) is always considered a critical issue and has a number of considerations that separate them from traditional wireless sensor network. First, sensor devices are typically vulnerable to physical compromise. Second, ... More
High Field Magneto-Conductivity Analysis of Bi2Se3 Single CrystalJul 13 2018We report the high field (up to 14Tesla) magneto-conductivity analysis of Bi2Se3 topological insulator grown via the self flux method. The detailed experimental investigations including crystal growth as well as the electrical, thermal and spectroscopic ... More
Fine structure collision strengths and line ratios for [Ne V] in infrared and optical sourcesApr 02 2013Improved collisions strengths for the mid-infrared and optical transitions in Ne V are presented. Breit-Pauli R-Matrix calculations for electron impact excitation are carried out with fully resolved near-threshold resonances at very low energies. In particular, ... More
[O II] line ratiosOct 04 2005Based on new calculations we reconfirm the low and high density limits on the forbidden fine structure line ratio [O II] I(3729)/I(3726): lim_{N_ e} --> 0} = 1.5 and lim_{N_ e} --> \infty} = 0.35. Employing [O II] collision strengths calculated using ... More
K-shell dielectronic resonances in photoabsorption: differential oscillator strengths for Li-like C IV, O VI, and Fe XXIVFeb 06 2001Mar 21 2001Recently X-ray photoabsorption in KLL resonances of O VI was predicted [Pradhan, Astrophys.J. Lett. 545, L165 (2000)], and detected by the Chandra X-ray Observatory [Lee et al, Astrophys. J. {\it Lett.}, submitted]. The required resonance oscillator strengths ... More
Statistical Analysis based Hypothesis Testing Method in Biological Knowledge DiscoveryJan 09 2014The correlation and interactions among different biological entities comprise the biological system. Although already revealed interactions contribute to the understanding of different existing systems, researchers face many questions everyday regarding ... More
Growth, Characterization and High Field Magneto-Conductivity of Co0.1Bi2Se3 Topological InsulatorDec 31 2018We report the crystal growth as well as transport properties of Co added Bi2Se3 single crystals. The values of the lattice parameters a and b for Co added sample were observed to increase as compared to the pure Bi2Se3. The Raman spectroscopy displayed ... More
Incremental Discovery of Prominent Situational FactsNov 18 2013Mar 26 2014We study the novel problem of finding new, prominent situational facts, which are emerging statements about objects that stand out within certain contexts. Many such facts are newsworthy---e.g., an athlete's outstanding performance in a game, or a viral ... More
BDNet: Bengali handwritten numeral digit recognition based on densely connected convolutional neural networksJun 10 2019Bengali handwritten digit recognition can be done using different image classification techniques. But the images of handwritten digits are different from natural images as the orientation of a digit as well as similarity of features of different digits ... More
Deep Neural Network Concepts for Background Subtraction: A Systematic Review and Comparative EvaluationNov 13 2018Conventional neural networks show a powerful framework for background subtraction in video acquired by static cameras. Indeed, the well-known SOBS method and its variants based on neural networks were the leader methods on the largescale CDnet 2012 dataset ... More
Gravitomagnetic effects in conformal gravityJan 10 2014Gravitomagnetic effects are characterized by two phenomena: first, the geodetic effect which describes the precession of the spin of a gyroscope in a free orbit around a massive object, second, the Lense-Thirring effect which describes the precession ... More
Analyzing an Analytical Solution Model for Simultaneous MobilityJan 09 2014Current mobility models for simultaneous mobility have their convolution in designing simultaneous movement where mobile nodes (MNs) travel randomly from the two adjacent cells at the same time and also have their complexity in the measurement of the ... More
Unified Electronic Recombination Of Ne-like Fe XVII: Implications for Modeling X-Ray PlasmasNov 09 2000Nov 25 2000Unified recombination cross sections and rates are computed for (e + Fe XVIII) --> Fe XVII including non-resonant and resonant (radiative and di-electronic recombination, RR and DR) processes in an ab initio manner with relativistic fine structure. The ... More
Unsupervised RGBD Video Object Segmentation Using GANsNov 05 2018Video object segmentation is a fundamental step in many advanced vision applications. Most existing algorithms are based on handcrafted features such as HOG, super-pixel segmentation or texture-based techniques, while recently deep features have been ... More
Improved collision strengths and line ratios for forbidden [O III] far-infrared and optical linesApr 03 2012Far-infrared and optical [O III] lines are useful temeprature-density diagnostics of nebular as well as dust obscured astrophysical sources. Fine structure transitions among the ground state levels 1s^22s^22p^3 \ ^3P_{0,1,2} give rise to the 52 and 88 ... More
Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements. V. Relativistic calculations for Fe XXIV and Fe XXV for X-ray modelingAug 01 2000Nov 28 2000Photoionization and recombination cross sections and rate coefficients are calculated for Li-like Fe XXIV and He-like Fe XXV using the Breit-Pauli R-matrix (BPRM) method. A complete set of total and level-specific parameters is obtained to enable X-ray ... More
Bar 1-Visibility Drawings of 1-Planar GraphsFeb 20 2013A bar 1-visibility drawing of a graph $G$ is a drawing of $G$ where each vertex is drawn as a horizontal line segment called a bar, each edge is drawn as a vertical line segment where the vertical line segment representing an edge must connect the horizontal ... More
BDNet: Bengali handwritten numeral digit recognition based on densely connected convolutional neural networksJun 10 2019Jun 11 2019Bengali handwritten digit recognition can be done using different image classification techniques. But the images of handwritten digits are different from natural images as the orientation of a digit as well as similarity of features of different digits ... More
Crystal Growth and Characterization of Bulk Sb2Te3Topological InsulatorApr 06 2018Apr 26 2018The Sb2Te3 crystals are grown using the conventional self flux method via solid state reaction route, by melting constituent elements (Sb and Te) at high temperature (850 C), followed by slow cooling (2 C per hour).The weak anti localization (WAL) related ... More
Converged Close-Coupling R-Matrix calculations of Photoionization of Fe XVII in Astrophysical Plasmas: from Convergence to CompletenessJan 07 2018Extensive resonance structures are manifest in R-Matrix (RM) calculations. However, there exist a large number of highly excited electronic configurations that may contribute to background non-resonant bound-free opacity in high-temperature plasmas. Since ... More
Electron-Ion Recombination Rate Coefficients and Photoionization Cross Sections for Astrophysically Abundant Elements IV. Relativistic calculations for C IV and C V for UV and X-ray modelingMar 27 2000Jun 07 2000The first complete set of unified cross sections and rate coefficients are calculated for photoionization and recombination of He- and Li-like ions using the relativistic Breit-Pauli R-matrix method. We present total, unified (e + ion) recombination rate ... More
Unsupervised Deep Context Prediction for Background Foreground SeparationMay 21 2018In many advanced video based applications background modeling is a pre-processing step to eliminate redundant data, for instance in tracking or video surveillance applications. Over the past years background subtraction is usually based on low level or ... More
High Field (up to 140kOe) Angle Dependent Magneto Transport of Bi2Te3 Single CrystalsDec 13 2017We report the angle dependent high field (up to 140kOe) magneto transport of Bi2Te3 single crystals, a well-known topological insulator. The crystals were grown from melt of constituent elements via solid state reaction route by self-flux method. Details ... More
Crystal Growth and basic transport and magnetic properties of MnBi2Te4Jun 21 2019We report successful growth of magnetic topological insulator (MTI) MnBi2Te4. Depending, upon the heating schedule the phase formation in terms of various Bi2Te3 + MnTe structures viz. MnBi2Te4, MnBi4Te7, MnBi6Te10 and MnTe are seen in powder X-ray diffraction ... More
Atomic data from the Iron Project.XLIII. Transition probabilities for Fe VFeb 10 2000An extensive set of dipole-allowed, intercombination, and forbidden transition probabilities for Fe V is presented. The Breit-Pauli R-matrix (BPRM) method is used to calculate 1.46 x 10^6 oscillator strengths for the allowed and intercombination E1 transitions ... More
A collection of model stellar spectra for spectral types B to early-MJul 16 2018Models of stellar spectra are necessary for interpreting light from individual stars, planets, integrated stellar populations, nebulae, and the interstellar medium. We provide a comprehensive and homogeneous collection of synthetic spectra for a wide ... More
XDoser, A Benchmarking Tool for System Load Measurement Using Denial of Service FeaturesMay 30 2019Technology has developed so fast that we feel both safe as well as unsafe in both ways. Systems used today are always prone to attack by malicious users. In most cases, services are hindered because these systems cannot handle the amount of over loads ... More
Resolution and accuracy of resonances in R-matrix cross sectionsJun 21 2004We investigate the effect of resonances in photoionization and recombination cross sections computed using the R-matrix method. Photoionization and recombination rates derived from high-resolution cross sections for oxygen ions are compared with earlier ... More
Unusual non saturating Giant Magneto-resistance in single crystalline Bi2Te3 topological insulatorNov 09 2016We report synthesis, structural details and electrical transport properties of topological insulator Bi2Te3. The single crystalline specimens of Bi2Te3 are obtained from high temperature (950C) melt and slow cooling (2C/hour). The resultant crystals were ... More
Mr. Doc: A Doctor Appointment Application SystemJan 17 2017Life is becoming too busy to get medical appointments in person and to maintain a proper health care. The main idea of this work is to provide ease and comfort to patients while taking appointment from doctors and it also resolves the problems that the ... More
Hikami-Larkin-Nagaoka (HLN) treatment of the Magneto Conductivity of Bi2Te3 Topological InsulatorMay 30 2018We report the magneto-conductivity analysis at different temperatures under magnetic field of up to 5Tesla of a well characterized Bi2Te3 crystal. Details of crystal growth and various physical properties including high linear magneto resistance are already ... More
Highly Excited Core Resonances in Photoionization of Fe XVII : Implications for Plasma OpacitiesApr 14 2011A comprehensive study of high-accuracy photoionization cross sections is carried out using the relativistic Breit-Pauli R-matrix (BPRM) method for (hnu + Fe XVII --> Fe XVIII + e). Owing to its importance in high-temperature plasmas the calculations cover ... More
Atomic data from the Iron Project. LIII. Relativistic allowed and forbidden transition probabilities for Fe XVIIFeb 26 2003An extensive set of fine structure levels and corresponding transition probabilities for allowed and forbidden transitions in Fe XVII is presented. A total of 490 bound energy levels of Fe XVII of total angular momenta 0 <= J <= 7 of even and odd parities ... More
X-ray absorption via K-alpha resonance complexes in oxygen ionsFeb 12 2003The K-alpha resonance complexes in oxygen ions O I - O VI are theoretically computed and resonance oscillator strengths and wavelengths are presented. The highly resolved photoionization cross sections, with relativistic fine structure, are computed in ... More
Effect of superthermality on nonlinear electrostatic modes in plasmasAug 14 2011The nonlinear propagation of electron-acoustic solitary structures is investigated in a plasma containing kappa-distributed (superthermal) electrons. Different types of localized structures are shown to exist. The occurrence of modulational instability ... More
Unusual non saturating Giant Magneto-resistance in single crystalline Bi2Te3 topological insulatorNov 09 2016Jan 23 2017We report synthesis, structural details and electrical transport properties of topological insulator Bi2Te3. The single crystalline specimens of Bi2Te3 are obtained from high temperature (950C) melt and slow cooling (2C/hour). The resultant crystals were ... More
X-Ray Resonance Opacity of Oxygen and Iron in AGN MCG--6-30-15Apr 08 2002Apr 09 2002Theoretical differential oscillator strengths related to monochromatic opacity due to K- and L-shell absorption from oxygen and iron ions are directly compared with the Chandra and Xmm-Newton spectra of Seyfert~1 galaxy MCG--6-30-15. We compute the highly ... More
Relativistic fine structure and resonance effects in electron-ion recombination and excitation of (e + C IV)May 25 2001Aug 28 2001Relativistic close coupling calculations are reported for unified electronic recombination of (e + C IV) including non-resonant and resonant recombination processes, radiative and dielectronic recombination (RR and DR). Detailed comparison of the theoretical ... More
An inter comparison of the upper critical fields (Hc2) of different superconductors - YBa2Cu3O7, MgB2, NdFeAsO0.8F0.2, FeSe0.5Te0.5 and Nb2PdS5Mar 28 2016Here we report the comparison of the upper critical fields of different superconductors being calculated by two different theories i.e., Werthamer Helfand Hohenburg (WHH) and Ginzberg Landau (GL). All the samples are synthesized through previously known ... More
Crystal Growth and Magneto-transport of Bi2Se3 Single crystalsJan 23 2017Mar 18 2017In this letter, we report growth and characterization of bulk Bi2Se3 single crystals. The studied Bi2Se3 crystals are grown by self flux method through solid state reaction from high temperature (950C) melt of constituent elements and slow cooling (2C/hour). ... More
Crystal Growth and basic transport and magnetic properties of MnBi2Te4Jun 21 2019Jul 09 2019We report successful growth of magnetic topological insulator (MTI) MnBi2Te4. Depending, upon the heating schedule the phase formation in terms of various Bi2Te3 + MnTe structures viz. MnBi2Te4, MnBi4Te7, MnBi6Te10 and MnTe are seen in powder X-ray diffraction ... More
Novel solid state vacuum quartz encapsulated growth of p-Terphenyl: the parent High Tc Oraganic Superconductor (HTOS)Jun 06 2017Jun 08 2017We report an easy and versatile route for the synthesis of the parent phase of newest superconducting wonder material i.e. p-Terphenyl. Doped p-terphenyl has recently shown superconductivity with transition temperature as high as 120K. For crystal growth, ... More
First principles study of M2InC (M = Zr, Hf and Ta) MAX phases: The effect of M atomic speciesMay 20 2018May 22 2018We have studied the physical properties of M2InC (M = Zr, Hf and Ta) MAX phases ternary carbides using density functional theory (DFT) methodology. The structural, elastic and electronic properties are revisited (and found to be in good agreement with ... More