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Puzzling phonon dispersion curves and vibrational mode instability in superconducting MgCNi3
Prafulla K. Jha,Sanjay D. Gupta,Sanjeev K. Gupta
AIP Advances , 2012, DOI: 10.1063/1.4714366
Abstract: A first principles calculation of the lattice dynamical properties of superconducting MgCNi3 has been performed using density functional perturbation theory (DFPT). The calculated phonon dispersion curves and phonon density of states have been compared with inelastic x-ray scattering (IXS) and inelastic neutron scattering (INS) measurements. We show for the first time that phonon dispersion curves for MgCNi3 in whole Brillouin zone are positive (stable phonon modes) and in good agreement with the experimental data. The phonon DOS shows absence of phonon density of states at zero energy unlike earlier calculations. There is a good agreement between calculated and experimental electron-phonon parameter and superconducting transition temperature. The Eliasberg function is quantitatively as well as qualitatively different from the phonon density of states. The lattice specific heat and Debye temperature do not show any anomalous behaviour.
New Approach for Fast Color Image Encryption Using Chaotic Map  [PDF]
Kamlesh Gupta, Sanjay Silakari
Journal of Information Security (JIS) , 2011, DOI: 10.4236/jis.2011.24014
Abstract: Image encryption using chaotic maps has been established a great way. The study shows that a number of functional architecture has already been proposed that utilize the process of diffusion and confusion. However, permutation and diffusion are considered as two separate stages, both requiring image-scanning to obtain pixel values. If these two stages are mutual, the duplicate scanning effort can be minimized and the encryption can be accelerated. This paper presents a technique which replaces the traditional preprocessing complex system and utilizes the basic operations like confusion, diffusion which provide same or better encryption using cascading of 3D standard and 3D cat map. We generate diffusion template using 3D standard map and rotate image by using vertically and horizontally red and green plane of the input image. We then shuffle the red, green, and blue plane by using 3D Cat map and standard map. Finally the Image is encrypted by performing XOR operation on the shuffled image and diffusion template. Theoretical analyses and computer simulations on the basis of Key space Analysis, statistical analysis, histogram analysis, Information entropy analysis, Correlation Analysis and Differential Analysis confirm that the new algorithm that minimizes the possibility of brute force attack for decryption and very fast for practical image encryption
A Simple Method to Produce Sub-Nucleosome Complexes of High Purity In Vitro  [PDF]
Saikat Bhattacharya, Sanjay Gupta
Advances in Bioscience and Biotechnology (ABB) , 2016, DOI: 10.4236/abb.2016.73012
Abstract: With the identification of increasing number of chromatin modifiers, histone variants, histone post-translational modifications and their cross-talk, it is essential to validate these findings and interactions in vitro for which pure histone complexes are required. Although, the production of such complexes has been described earlier but still it remains a challenge for a non-specialist lab. Here we describe a protocol to quickly obtain large quantities of highly pure histones using bacterial expression system for GST pull-down and reconstitution experiments. In addition, we describe methods to quickly reconstitute and purify H2A/H2B dimers, H3/H4 tetramers and histone octamers for in vitro experiments. We demonstrate that these sub-complexes are properly folded and are hence, true representatives of the actual substrates in vivo. We also show that histones have a propensity to be non-specifically cleaved by proteases. Our results suggest that TEV protease is the most suitable protease while working with histones. The methodology described here should allow researchers to purify histone complexes in three days enabling functional and structural analyses of histone variants, mutants and post-translational modifications.
Isolation of Salmonella paratyphi A from renal abscess
D'Cruz Sanjay,Kochhar Suman,Chauhan Sandeep,Gupta Varsha
Indian Journal of Pathology and Microbiology , 2009,
Abstract: Intrarenal abscesses remain a significant cause of morbidity and mortality as well as a diagnostic dilemma because a plethora of microorganisms can cause this condition. A definitive diagnosis is made by demonstrating the organisms from the aspirate and the success or failure of therapy depends upon the antimicrobial sensitivity pattern. Enteric fever is a multisystem disorder caused by invasive strains of salmonella. Salmonellosis continues to be a major public health problem, especially in developing countries. Classic enteric fever is caused by S. typhi and usually less severe enteric fevers are caused by S. paratyphi A, B, or C. However, at times S. paratyphi is capable of causing serious and often life-threatening infections like infective endocarditis, pericarditis, empyma, sino-venous thrombosis, osteomyelitis, meningitis, bone marrow infiltration, hepatitis and pancreatitis. There are anecdotal case reports in world literature of abscesses being caused by this organism. Renal involvement like bacteriuria, nephrotic syndrome and acute renal failure have been reported due to S. parayphi A. S. paratyphi A has never been implicated in renal abscess, we report one such case that was managed successfully with medical therapy.
Torsades de pointes in a patient of dilated cardiomyopathy occurring early on oral amiodarone therapy
Mohit D. Gupta,Girish MP,Partha Prateem Choudhury,Sanjay Tyagi
International Journal of Basic & Clinical Pharmacology , 2013, DOI: 10.5455/2319-2003.ijbcp20130827
Abstract: Amiodarone induced proarrhythmic effects are rare. We report a case of amiodarone induced torsades de pointes in a young boy aged 16 years occurring early after initiation of oral amiodarone. This case underscores the need of careful electrocardiographic monitoring early during amiodarone therapy to avoid a potentially fatal arrhythmia. [Int J Basic Clin Pharmacol 2013; 2(4.000): 492-494]
Statistical downscaling and projection of future temperature and precipitation change in middle catchment of Sutlej River Basin, India
Dharmaveer Singh,R D Gupta,Sanjay K Jain
- , 2015,
Abstract:
Electronic structure of a single vortex in d-wave superconductor revisited
Sanjay Gupta
Physics , 2012,
Abstract: The present work deals with the study of d-wave superconductor in presence of a single vortex placed at the centre of the 2D lattice using the $t-t'-J$ model within the renormalized mean field theory. It is found that the in absence of the vortex the ground state has a d-wave configuration. In presence of the vortex, the superconducting order parameter, above the critical doping, drops to a low non zero value within a few lattice points from the vortex (that is within the the vortex core) and beyond it converges to the constant value in absence of vortex. We observe that above the critical doping things are consistent with the experimental results while there is an anomalous rise in the superconducting order parameter at very low doping within the vortex core. This we feel is because of antiferromagnetic ordering taking place within the vortex core at low doping.
Physics of interface: Mott insulator barrier sandwiched between two metallic planes
Sanjay Gupta,Tribikram Gupta
Physics , 2010,
Abstract: We consider a heterostructure of a metal and a barrier with onsite correlation at half filling using unrestricted Hartree Fock. We find that above a certain value of correlation strength in the barrier planes, the system is a Mott insulator, while below this value the system still behaves like a gapless insulator. The energy spectrum is found to be very novel with the presence of multiple gaps. Thus the system remains non metallic for any finite value of correlation.
Dimensional and temperature dependence of metal insulator transition in correlated and disordered systems
Tribikram Gupta,Sanjay Gupta
Physics , 2008, DOI: 10.1209/0295-5075/88/17006
Abstract: We study the dimensional dependence of the interplay between correlation and disorder in two dimension at half filling using 2D $t-t'$ disordered Hubbard model with deterministic disorder both at zero and finite temperatures. Inclusion of $t'$ without disorder leads to a metallic phase at half filling below a certain critical value of $U$. Above this critical value $U_c$ correlation favours antiferromagnetic phase. Since disorder leads to double occupancy over the lower energy site, the competition between Hubbard $U$ and disorder leads to the emergence of a metallic phase, which can be quantified by the calculation of Kubo conductivity, gap at half-filling, density of states, spin order parameter, Inverse participation ratio (IPR) and bandwidth. We have studied the effect of disorder on the system in a very novel way through a deterministic disorder which follows a Fibonacci sequence. Behaviour of different parameters show interesting features on going from a two to quasi one dimensional system.
Physics of interface: Strongly correlated barrier with chemical modulation sandwiched between two metallic planes
Tribikram Gupta,Sanjay Gupta
Physics , 2010,
Abstract: Barrier planes described by the Ionic Hubbard model and sandwiched between metallic planes on both sides are studied using unrestricted Hartree Fock. For zero onsite correlation, the presence of the metallic interface generates an additional gap in the energy spectrum away from half filling, if the chemically modulated potential in the barrier planes exceed a critical value. There is reentrant behaviour and an insulator-metal-insulator transition as we tune onsite correlation for fixed site potential. The metal is thus able to penetrate the barrier planes due to proximity effect, in a system that is otherwise an insulator throughout.
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