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Search Results: 1 - 10 of 462980 matches for " Chatterjee A "
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Acquired (digital) fibrokeratoma
Jaiswal A,Chatterjee M
Indian Journal of Dermatology, Venereology and Leprology , 2002,
Abstract: Acquired digital fibrokeratoma is a rarely reported disorder, especially in the Indian literature. We report our findings on one such case, occurring at an unusual site.
Painful bruising syndrome
Chatterjee Manas,Jaiswal A
Indian Journal of Dermatology, Venereology and Leprology , 2002,
Abstract: Painful bruising syndrome is a distinctive but rare clinical entity. A case of this condition in a psychiatrically normal teenage girl is reported
Watson′s water hammer pulse
Khasnis A,Chatterjee S
Journal of Postgraduate Medicine , 2008,
Abstract:
Local Magnetization in Critical Ising Model with Boundary Magnetic Field
R. Chatterjee,A. Zamolodchikov
Physics , 1993, DOI: 10.1142/S0217732394002082
Abstract: We discribe a simple way to derive spin correlation functions in 2D Ising model at critical temperature but with nonzero magnetic field at the boundary. Local magnetization (i.e. one-point function) is computed explicitly for half-plane and disk geometries.
Pairing in disordered s-wave superconductors and the effect of their coupling
Budhaditya Chatterjee,A. Taraphder
Physics , 2007, DOI: 10.1016/j.ssc.2008.09.037
Abstract: Inhomogeneity is introduced through random local interactions (Ui) in an attractive Hubbard model on a square lattice and studied using mean-field Bogoliubov-de Gennes formalism. Superconductivity is found to get suppressed by the random Ui contrary to the results of a bimodal distribution of Ui. The proximity effect of superconductivity is found to be strong, all sites develop non-zero pairing amplitude. The gap in the density of states is always non-zero and does not vanish even for strong disorder. When two such superconductors are coupled via a channel, the effect of one on the other is negligible. The length and width of the connector, do not seem to have any noticeable effect on the superconductivity in either systems. The superconducting blocks behave as independent entity and the introduction of the channel have no effect on them.
Spherical collapse of a heat conducting fluid in higher dimensions without horizon
A. banerjee,S. Chatterjee
Physics , 2004, DOI: 10.1007/s10509-005-6849-x
Abstract: We consider a scenario where the interior spacetime,described by a heat conducting fluid sphere is matched to a Vaidya metric in higher dimensions.Interestingly we get a class of solutions, where following heat radiation the boundary surface collapses without the appearance of an event horizon at any stage and this happens with reasonable properties of matter field.The non-occurrence of a horizon is due to the fact that the rate of mass loss exactly counterbalanced by the fall of boundary radius.Evidently this poses a counter example to the so-called cosmic censorship hypothesis.Two explicit examples of this class of solutions are also given and it is observed that the rate of collapse is delayed with the introduction of extra dimensions.The work extends to higher dimensions our previous investigation in 4D.
C-field cosmological model in higher dimensions
S. Chatterjee,A. Banerjee
Physics , 2003, DOI: 10.1023/B:GERG.0000010477.10127.3f
Abstract: Hoyle and Narlikar's $C$-field cosmology is extended in the framework of higher dimensional spacetime and a class of exact solutions is obtained. Adjusting the arbitrary constants of integration one can show that our model is amenable to the desirable property of dimensional reduction so that the universe ends up in an effective 4D one.Further with matter creation from the $C$-field the mass density steadies with time and the usual bigbang singularity is avoided. An alternative mechanism is also suggested which seems to provide matter creation in the 4D spacetime although total matter in the 5D world remains conserved. Quintessence phenomenon and energy conditions are also discussed and it is found that in line with the physical requirements our model admits a solution with a decelerating phase in the early era followed by an accelerated expansion later. Moreover, as the contribution from the $C$-field is made negligible a class of our solutions reduces to the previously known higher dimensional models in the framework of Einstein's theory.
Engineering Chitosan Using α, ω-Dicarboxylic Acids—An Approach to Improve the Mechanical Strength and Thermal Stability  [PDF]
G. Sailakshmi, Tapas Mitra, Suvro Chatterjee, A. Gnanamani
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2013, DOI: 10.4236/jbnb.2013.42021
Abstract:

The current scenario in tissue engineering research demands materials of requisite properties, viz., high porosity, mechanical stability, thermal stability, biocompatibility and biodegradability for clinical applications. However, bringing these properties in single biomaterial is a challenging task, which needs intensive research on suitable cross-linking agents. In the present study, 3D scaffold was prepared with above said properties using chitosan and oxalic (O), malonic (M), succinic (S), glutaric (G), adipic (A), pimelic (P), suberic (SU), azelaic (AZ) and sebacic (SE) acid (OMS- GAP-SAS) individually as a non covalent cross-linkers as well as the solvent for chitosan. Assessment on degree of cross-linking, mechanical strength, FT-IR analysis, morphological observation, thermal stability, binding interactions (molecular docking), in vitro biocompatibility and its efficacy as a wound dressing material were performed. Results revealed the degree of cross-linking for OMSGAP-SAS engineered chitosan were in the range between ≈55% - 65% and the biomaterial demonstrated thermal stability more than 300°C and also exhibited ≥3 - 4 fold increase in mechanical strength compared to chitosan alone. The bioinformatics studies evidently proved the chemistry behind the

Bose condensation of interacting gases in traps with and without optical lattice
S. Chatterjee,A. E. Meyerovich
Physics , 2008, DOI: 10.1103/PhysRevA.79.033628
Abstract: We discuss effects of particle interaction on Bose condensation in inhomogeneous traps with and without optical lattice. Interaction pushes normal particles away from the condensate droplet, which is located in the center of the trap, towards the periphery of the trap where the trapping potential is large. In the end, the remaining normal particles are squeezed to a quasi-2D shell around the condensate droplet thus changing the effective dimensionality of the system. In the absence of the optical lattice the index in the temperature dependence of the condensate density at the later stages of the process is close to 2 with a weak dependence on the number of trapped particles. In the presence of the lattice inside the trap this index acquires a strong dependence on the number of particles inside the trap and gradually falls from a 3D to a 2D value with an increase in the number of particles. This change in index is explained by the lattice-driven spread of the condensate droplet and the localization of the narrow band particles by the trap potential.
First excited state calculation using different phonon bases for the two-site Holstein model
Jayita Chatterjee,A. N. Das
Physics , 2000, DOI: 10.1142/S0217979200002247
Abstract: The single-electron energy and static charge-lattice deformation correlations have been calculated for the first excited state of a two-site Holstein model within perturbative expansions using different standard phonon bases obtained through Lang-Firsov (LF) transformation, LF with squeezed phonon states, modified LF, modified LF transformation with squeezed phonon states, and also within weak-coupling perturbation approach. Comparisons of the convergence of the perturbative expansions for different phonon bases reveal that modified LF approach works much better than other approaches for major range of the coupling strength.
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