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Search Results: 1 - 10 of 326915 matches for " S. Banerjee "
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Cutaneous manifestations in renal failure patients: A case series
Banerjee S
Indian Journal of Dermatology, Venereology and Leprology , 2007,
Abstract: Cutaneous involvement in renal disease is due to a host of factors ranging from metabolic disturbances to immunosuppressive drugs. Herein we report a series of six cases of renal failure with varied cutaneous manifestations ranging from infections to neoplasms due to prolonged immunosuppression. Our first case had cutaneous cryptococcosis where skin lesions gave a clue to the diagnosis of altered sensorium and underlying meningitis. The second case initially presented with florid warts and was treated successfully but later presented with an explosive recurrence of skin lesions due to malignant transformation. Our third case had basal cell carcinoma over the presternal region that was successfully treated with liquid nitrogen cryotherapy. Our fourth case had diabetic nephropathy that presented with septicemia and purpura fulminans. The last case had cutaneous manifestations of drug therapy because of heparin infusion. To conclude, cutaneous manifestations in patients with renal failure are varied and a high degree of suspicion is needed for early diagnosis and aggressive treatment to effectively combat mortality and morbidity.
Simple derivation of Young, Wenzel and Cassie-Baxter equations and its interpretations
S. Banerjee
Physics , 2008,
Abstract: In this paper we have derived Young's, Wenzel's and Cassie-Baxter's equations using conceptual model rather than showing rigorous derivation to help the new-comers in this field. We then pointed out that if the substrate is initially hydorphilic then one can modify the surface morphology and make the substrate to become hydrophobic or superhydrophobic. But, if the substrate is initially hydrophobic then one can only make it superhydrophobic but not hydrophilic by modifying the surface morphology using the formalisms mentioned in this paper
Tropical Geometry over Higher Dimensional Local Fields
S. Banerjee
Mathematics , 2011,
Abstract: We introduce the tropicalization of closed subschemes of a torus defined over a higher dimensional local field. We study the basic invariants of such tropicalizations. This is a generalization of the results of Einslieder, Kapranov, Lind, Speyer and Sturmfels to higher local fields.
Effect of Diorder on the Peak Effect and Structure of Flux Line Lattice in 2H-NbSe2
S. S. Banerjee
Physics , 1997,
Abstract: The effect of disorder on flux line lattice (FLL) melting is studied via the Peak Effect phenomenon. On the upper branch of the Peak Effect curve, where this effect is more robust, we observe a stepwise disordering of the FLL, suggesting two first order transition spanning the Peak Effect region. The lower part of the curve is found to be strongly affected by disorder. Both the branch and the "nose", i.e., the turnaround of the curve, dissapear in systems with stronger disorder and the observed results are consitent with the line seperating a disentangled liquid or a glass from an entangled flux liquid.
Anomalous Peak Effect in CeRu2 and NbSe2 : Fracturing of a Flux Line Lattice?
S. S. Banerjee
Physics , 1997, DOI: 10.1103/PhysRevB.58.995
Abstract: CeRu2 and 2H-NbSe2 display remarkable similarities in their magnetic response, reflecting the manner in which the weakly pinned flux line lattice (FLL) loses spatial order in the Peak Effect (PE) regime. The discontinuous change in screening response near the onset of PE and the history dependence in it are attributed to a disorder-induced fracturing transition of the FLL, as an alternative to the scenario involving the appearance of a spatial modulation in superconducting order parameter in CeRu2.
Disorder, History Dependence and Phase Transitions in a Flux Lattice
S. S. Banerjee
Physics , 1997,
Abstract: The vortex lattice is an ideal system to study the competition and interplay between interaction and disorder. New results on 2H-NbSe_2 (in samples of progressively increasing pinning) elucidate how pinning alters the phase boundary separating the "ordered" and "disordered" states of the flux lines and causes a novel disorder-induced transition. A generic magnetic phase diagram of a type II superconductor.
Growth kinetic study of sputter deposition: Ag on Si/SiO$_2$
S. Banerjee,S. Kundu
Physics , 2001,
Abstract: We have presented the kinetic study of the very initial growth stages of an ultra thin film (40 $\AA$- 150$\AA$) of Ag sputter-deposited on Si(001) substrate containing native oxide using grazing incidence x-ray reflectivity (GIXR) technique and Atomic Force Microscopy (AFM). We observe that the film consists of mounds with the presence of voids. The thickness `d_{xray}' and the packing fraction `\eta ' of the film as a function of time `t' follow a simple power law, d_{xray} $\thicksim t^{m} and \eta \thicksim $t^{n}$ with the exponent m = 0.58 and n = 0.37 respectively. We have quantitatively determined that the voids between the mounds decrease at the initial growth stages with the increase in mound size using GIXR measurement. The mound size increases mainly by the coalescence process on the substrate. We have observed that as a function of time the mound size R(t) increases radially as $\thicksim $t^{z}. The radial growth exponent z crosses over from z > 0.5 to z $\thicksim $ 0.25 indicating two growth regimes. The GIXR measurement reveals sublinear dependence of \eta on d and the AFM measurement shows a cross over of the radial growth exponent, both these indicates that the lateral growth of the mound is enhanced initially reducing the voids.
Magnetic Phase Diagram of Weakly Pinned Type-II Superconductors
S. S. Banerjee
Physics , 1999,
Abstract: The phenomenon of superconductivity was discovered in 1911, however, the methodology to classify and distinguish type-II superconductivity was established only in late fifties after Abrikosov's prediction of a flux line lattice in 1957. The advent of high temperature superconductors (HTSC) in 1986 focused attention onto identifying and classifying other possible phases of vortex matter in all classes of superconductors by a variety of techniques. We have collated evidences in support of a proposal to construct a generic phase diagram for weakly pinned superconducting systems, based on their responses to ac and dc magnetic fields. The phase diagram comprises quasi-glassy phases, like, the Bragg glass, a vortex glass and a reentrant glass in addition to the (completely) amorphous phases of pinned and unpinned variety. The characteristic metastability and thermomagnetic history dependent features recognized amongst various glassy vortex phases suggest close connections between vortex matter and other disordered condensed matter systems, like, spin glasses, super cooled liquids/ structural glasses, etc. A novel quenched random disorder driven fracturing transition stands out amongst other noteworthy facets of weakly vortex pinned vortex matter.
Optical Control of Millmeter-wave Lateral Double-Drift Region Silicon IMPATT Device
A. Acharyya,S. Banerjee,J. P. Banerjee
Radioengineering , 2012,
Abstract: The effect of optical illumination on lateral Double-Drift Region (DDR) structure of Silicon Impact Avalanche Transit Time (IMPATT) device is investigated in this paper. The device is designed to operate at mm-wave W-band frequency. The optical modulation of DC and RF properties of lateral DDR IMPATT device is studied by a simulation technique which incorporates the dependence of normalized difference of photocurrent density at the depletion layer edges on the intensity of optical illumination and surface density of photon flux. The simulation results are compared with those obtained for a conventional vertical DDR Si IMPATT structure under similar optical and electrical operating conditions. The results show that the optical control is more effective in lateral IMPATT structure than in its vertical counterpart as regards reduction of output power and shifting of optimum frequency. When light is incident on hole drift layer of the lateral structure the output power reduces by 18.7% while the optimum frequency shifts upwards by 2.48%. Under similar conditions the power reduces by 10.9% and optimum frequency shifts upwards by 0.75% in vertical structure.
Large-Signal Simulation of 94 GHz Pulsed Silicon DDR IMPATTs Including the Temperature Transient Effect
A. Acharyya,S. Banerjee,J. P. Banerjee
Radioengineering , 2012,
Abstract: In this paper large-signal modeling and simulation has been carried to study the frequency chirping due to temperature transients and the large-signal power and efficiency of pulsed silicon Double-Drift Region (DDR) Impact Avalanche Transit Time (IMPATT) device operating at 94 GHz. A large-signal simulation method based on non-sinusoidal voltage excitation incorporating the transient thermal effect has been developed by the authors. Results show that the device is capable of delivering a peak pulsed power output of 17.5 W with 12.8% efficiency when the voltage modulation is 60%. The maximum junction temperature rise is 350.2 K for a peak pulsed bias current of 6.79 A with 100 ns pulsewidth and 0.5 percent duty cycle; whereas the chirp bandwidth is 8.3 GHz.
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