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Search Results: 1 - 10 of 198752 matches for " Goswami N "
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A Characterization of Jacobson Radical in Γ-Banach Algebras  [PDF]
Nilakshi Goswami
Advances in Pure Mathematics (APM) , 2012, DOI: 10.4236/apm.2012.26062
Abstract: Let V1 and V2 be two -Banach algebras and Ri be the right operator Banach algebra and Li be the left operator Banach algebra of Vi(i=1,2). We give a characterization of the Jacobson radical for the projective tensor product V1rV2 in terms of the Jacobson radical for R1rL2. If V1 and V2 are isomorphic, then we show that this characterization can also be given in terms of the Jacobson radical for R2rL1.
Lifshitz Transition Including Many-Body Effects in Bi-Layer Graphene and Change in Stacking Order  [PDF]
Partha Goswami
Graphene (Graphene) , 2013, DOI: 10.4236/graphene.2013.22013
Abstract: We consider the AB-(Bernal) stacking for the bi-layer graphene (BLG) system and assume that a perpendicular electric field is created by the external gates deposited on the BLG surface. In the basis (A1, B2, A2, B1) for the valleyKand the basis (B2, A1, B1, A2) for the valley K′, we show the occurrence of trigonal warping [1], that is, splitting of the energy bands or the density of states on the kx - ky plane into four pockets comprising of the central part and three legs due to a (skew) interlayer hopping between A1 and B2. The hopping between A1 - B2 leads to a concurrent velocity v3 in addition to the Fermi velocity vF. Our noteworthy outcome is that the above-mentioned topological change, referred to as the Lifshitz transition [2, 3], is entirely bias-tunable. Furthermore, the many-body effects, which is known to yield logarithmic renormalizations [4] in the band dispersions of monolayer graphene, is found to have significant effect on the bias-tunability of this transition. We also consider a variant of the system where the A atoms of the two layers are over each other and the B atoms of the layers are displaced with respect to each other. The Fermi energy density of statesfor zero bias corresponds to the inverted sombrero-like structure. The structure is found to get deformed due to the increase in the bias.
Importance of integrin receptors in the field of pharmaceutical & medical science  [PDF]
Sumit Goswami
Advances in Biological Chemistry (ABC) , 2013, DOI: 10.4236/abc.2013.32028
Abstract: Integrin receptors have remained as a key subject of interest in the pharmaceutical industry for the last few years. There are a total of 24 different types of integrin heterodimers. Each of these heterodimers plays important role in various biological processes that are inherent to different pathological conditions. As a result, integrin receptors have been extensively evaluated for their role in therapeutic targeting. There are different classes of inhibitors against integrin receptors and this review provides an overview on different classes of integrin inhibitors that are currently available. A number of review articles have been written on the possible application of integrin receptors in therapeutic targeting. Many of these articles have heavily emphasized on the importance of αvβ3 & αvβ5 receptors as major pharmaceutical target in cancer but little emphasis has been given on the importance of other integrin receptors, such as α5β1, αIIbβ3, α4β7, αvβ6 etc. While this review gives due importance to both αvβ3 & αvβ5 receptors and provides an historical perspective on how these two receptors have evolved as a potential target for cancer, significant emphasis has also been given on the other integrin receptors that have started enjoying the status of important drug target over the course of last few years. Effort has been maintained to discuss briefly on the key physiological basis of their importance as drug target. For example, involvement of αvβ3 in angiogenesis has made it a therapeutic target for the treatment of cancer. At the same time expression of this receptor on the surface of osteoclast has made it a target for the treatment of osteoporosis. Thus, emphasis has been given on discussing the role of the integrin receptors in different disease conditions followed by specific examples of drug molecules that have been trialed against these receptors. While hundreds of candidate molecules have been developed against different integrin receptors only a handful of them has been subject to phase-III clinical trial. That necessitates careful consideration of certain concerns that are associated with direct targeting of integrins and thus has also been an important goal of this review. In the last few years application of integrin receptors have extended beyond mere therapeutic targeting. Several integrin receptors are currently are studied for their potential of aiding at diagnostic imaging and drug delivery. In this review a brief overview has also been provided on how integrin are being
Attempt to isolate trachoma agent from lacrimal-sac tissue
Vali N,Goswami A,Gupta U
Indian Journal of Ophthalmology , 1972,
Abstract:
The CH fraction of Carbon stars at high Galactic latitudes
Aruna Goswami,Drisya Karinkuzhi,N. S. Shantikumar
Physics , 2009, DOI: 10.1111/j.1365-2966.2009.15939.x
Abstract: CH stars form a distinct class of objects with characteristic properties like iron deficiency, enrichment of carbon and overabundance in heavy elements. These properties can provide strong observational constraints for theoretical computation of nucleosynthesis at low-metallicity. An important question is the relative surface density of CH stars which can provide valuable inputs to our understanding on the role of low to intermediate-mass stars in the early Galactic chemical evolution. Spectroscopic characterization provides an effective way of identifying CH stars. The present analysis is aimed at a quantitative assessment of the fraction of CH stars in a sample of stars using a set of spectral classification criteria. The sample consists of 92 objects selected from a collection of candidate Faint High Latitude Carbon stars from the Hamburg/ESO survey. Medium resolution (R ~ 1300) spectra for these objects were obtained using OMR at VBO, Kavalur and HFOSC at HCT, IAO, Hanle, during 2007 - 2009 spanning a wavelength range 3800 - 6800 A. Spectral analysis shows 36 of the 92 objects to be potential CH stars; combined with our earlier studies (Goswami 2005, Goswami et al. 2007) this implies ~ 37% (of 243) objects as the CH fraction. We present spectral descriptions of the newly identified CH star candidates. Estimated effective temperatures, 12C/13C isotopic ratios and their locations on the two colour J-H vs H-K plot are used to support their identification.
Nanoscale self-affine surface smoothing by ion bombardment
D. K. Goswami,B. N. Dev
Physics , 2002, DOI: 10.1103/PhysRevB.68.033401
Abstract: Topography of silicon surfaces irradiated by a 2 MeV Si$^+$ ion beam at normal incidence and ion fluences in the range $10^{15}-10^{16}$ ions/cm$^{2}$ has been investigated using scanning tunneling microscopy. At length scales below $\sim$~50 nm, surface smoothing is observed; the smoothing is more prominent at smaller length scales. The smoothed surface is self-affine with a scaling exponent $\alpha=0.53\pm0.02$.
HE 1015-2050: Discovery of a Hydrogen-deficient carbon star at high galactic latitude
Aruna Goswami,Drisya Karinkuzhi,N. S. Shantikumar
Physics , 2010, DOI: 10.1088/2041-8205/723/2/L238
Abstract: Medium resolution spectral analysis of candidate Faint High Latitude Carbon (FHLC) stars from Hamburg/ESO survey has given us the potential to discover objects of rare types. Two primary spectral characteristics of R Coroanae Borealis (RCB) stars are hydrogen deficiency and weaker CN bands relative to C_{2} bands. They are also characterized by their characteristic location in the J-H, H-K plane with respect to cool carbon stars. From a spectral analysis of a sample of 243 candidate FHLC stars, we have discovered a hydrogen-deficient carbon (HdC) star HE 1015-2050, at high Galactic latitude. A differential analysis of its spectrum with that of the spectrum of U Aquarii (U Aqr), a well-known cool HdC star of RCB type, provides sufficient evidence to put this object in a group same as that of U Aqr. Further, it is shown that HE 1015-2050 does not belong to any of the C-star groups CH, C-R, C-N or C-J. Cool RCB stars form a group of relatively rare astrophysical objects; approximately 51 are known in the Galaxy and some 18 in the Large Magellanic Clouds (LMC) and five in Small Magellanic Cloud (SMC). The present discovery adds a new member to this rare group. Although its spectral characteristics and its location in the J-H vs H-K plane places HE 1015-2050 in the same group to which U Aqr belongs, extended photometric observations would be useful to learn if there is any sudden decline in brightness, this being a characteristic property of HdC stars of RCB type.
An Experience Based Learning Controller  [PDF]
Debadutt Goswami, Ping Jiang
Journal of Intelligent Learning Systems and Applications (JILSA) , 2010, DOI: 10.4236/jilsa.2010.22011
Abstract: The autonomous mobile robots must be flexible to learn the new complex control behaviours in order to adapt effectively to a dynamic and varying environment. The proposed approach of this paper is to create a controller that learns the complex behaviours incorporating the learning from demonstration to reduce the search space and to improve the demonstrated task geometry by trial and corrections. The task faced by the robot has uncertainty that must be learned. Simulation results indicate that after the handful of trials, robot has learned the right policies and avoided the obstacles and reached the goal.
A New Rectangular Finite Element Formulation Based on Higher Order Displacement Theory for Thick and Thin Composite and Sandwich Plates  [PDF]
Sanjib Goswami, Wilfried Becker
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.33019
Abstract:

A new displacement based higher order element has been formulated that is ideally suitable for shear deformable composite and sandwich plates. Suitable functions for displacements and rotations for each node have been selected so that the element shows rapid convergence, an excellent response against transverse shear loading and requires no shear correction factors. It is completely lock-free and behaves extremely well for thin to thick plates. To make the element rapidly convergent and to capture warping effects for composites, higher order displacement terms in the displacement kinematics have been considered for each node. The element has eleven degrees of freedom per node. Shear deformation has also been considered in the formulation by taking into account shear strains ( rxz and ryz) as nodal unknowns. The element is very simple to formulate and could be coded up in research software. A small Fortran code has been developed to implement the element and various examples of isotropic and composite plates have been analyzed to show the effectiveness of the element.

Gender Differences in Technology Usage—A Literature Review  [PDF]
Ananya Goswami, Sraboni Dutta
Open Journal of Business and Management (OJBM) , 2016, DOI: 10.4236/ojbm.2016.41006
Abstract: The usage of Information Technology has expanded dramatically in today’s homes, business organizations and Government departments Technology has become an inevitable part of human life. Researchers have come up with various models and theories to investigate factors that influence the extent to which humans use computers and its applications. Unified Theory of Adoption and Use of Technology (UTAUT) is the latest model which has been conceived to understand the nature of technology usage and has been applied in various domains like education, banking, health care etc. Gender has been attributed as a significant variable in explaining the technology acceptance behaviour of humans. The objective of this study is to review the existing literature on the technology usage and intention to use technology from the gender perspective. It has been observed from the review that in few contexts, gender plays a significant role in determining the intention of accepting new technology and there are cases where gender differences cannot be discerned.
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