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161.
162.
S. K. Ghosal Biplab Raychaudhuri Anjan Kumar Chowdhury Minakshi Sarker 《Foundations of Physics Letters》2004,17(5):457-477
The paper discusses a recently posed paradox in relativity concerning the speed of light as measured by an observer on board a rotating turn-table. The counter-intuitive problem put forward by F. Selleri concerns the theoretical prediction of an anisotropy in the speed of light in a reference frame comoving with the edge of a rotatiing disc even in the limit of zero acceleration. The paradox not only challenges the internal consistency of the special relativity theory but also undermines the basic tenet of the conventionality of simultaneity thesis of relativity. The present paper resolves the issue in a novel way by recasting the original paradox in the Galilean world and thereby revealing, in a subtle way, the weak points of the reasonings leading to the fallacy. As a background the standard and the non-standard synchronies in the relativistic as well as in the Galilean world are discussed. In passing, this novel approach also clarifies (contrary to often made assertions in the literature) that the so-called desynchronization of clocks cannot be regarded as the root cause of the Sagnac effect. Finally in spite of the flaw in the reasonings leading to the paradox Selleri's observation regarding the superiority of the absolute synchrony over the standard one for a rotation observer has been upheld. 相似文献
163.
Swapan?Konarswakonar@yahoo.com" title="skonar@bitmesra.ac.in swakonar@yahoo.com" itemprop="email" data-track="click" data-track-action="Email author" data-track-label="">Email author Anjan?Biswas 《Optical and Quantum Electronics》2004,36(15):1291-1302
The intra-channel collision of optical solitons, with parabolic law nonlinearity, is studied in this paper by the aid of quasi-particle theory. The perturbation terms that are considered in this paper are the nonlinear gain and saturable amplifiers along with filters. The suppression of soliton–soliton interaction, in presence of these perturbations terms, is achieved. The numerical simulations support the quasi-particle theory. 相似文献
164.
Nonlinear Dynamics - The realization of soliton control and soliton quality balance is one of the key research contents of optical communications. In order to better reflect the nonlinear... 相似文献
165.
Anjan S Joshipura 《Pramana》2000,54(1):119-132
The observed deficits in the solar and atmospheric neutrino fluxes along with the accelerator results on neutrino oscillations
significantly constrain possible mass and mixing patterns among neutrinos. We discuss possible patterns emerging from the
experimental results and review theoretical attempts to understand them. 相似文献
166.
Soham Maity Anjan Bedi Satish Patil 《Journal of polymer science. Part A, Polymer chemistry》2021,59(24):3181-3188
Chiral all-π-conjugated conducting polymers are of significant importance because of their promising aspects ranging from organic electronics, organic spin filters, efficient water splitting materials, magneto-optic materials to circularly polarized light emitters. Here, we report the synthesis and characterization of the first series of diketopyrrolopyrrole based chiral low band-gap alternating copolymers. Alongside characterizations by UV and CD spectroscopy, AFM and FESEM were further performed to understand the morphology of the optically active polymers. The stereochemistry of the side-chains on TDPP unit played a pivotal role in determining chiroptical properties and supramolecular self-assembly of the copolymers in solution which lead to layer-by-layer helical morphology in solid-state. Interestingly, D-A intramolecular charge transfer transition showed Cotton effect with bimodal nature, which is remarkably stronger than the π-π* transition. 相似文献
167.
Ali Sk Irsad Das Anjan Dutta Dhanadeep Das Ajit Mahata Nagendranath Mandal Samiran Mandal Atis Chandra 《Journal of Sol-Gel Science and Technology》2021,100(1):89-100
Journal of Sol-Gel Science and Technology - Nickel doped lead oxide (Pb1-xNixO) nanoparticles with different concentration (x = 0.00, 0.01, 0.05, 0.10, 0.15, 0.20, 0.25, and 0.30) of... 相似文献
168.
Zayed Elsayed M. E. Alngar Mohamed E. M. Biswas Anjan Ekici Mehmet Guggilla Padmaja Khan Salam Alshehri Hashim M. Belic Milivoj R. 《Optics and Spectroscopy》2022,130(1):28-34
Optics and Spectroscopy - Optical solitons with fiber Bragg gratings and polynomial law of nonlinear refractive index are addressed in the paper. The auxiliary equation approach together with an... 相似文献
169.
Anjan Biswas 《Fiber and Integrated Optics》2013,32(6):571-579
The variational principle is employed to obtain the evolution of the parameters of Gaussian and super-Gaussian chirped solitons that propagates through multiple-core nonlinear optical fiber arrays. This is governed by the dispersion-managed nonlinear Schrodinger's equation with strong dispersion management in the presence of linear coupling between the adjacent cores. The results are valid for any configuration of the cores. 相似文献
170.
Dr. Anjan Bedi Dr. Ori Gidron 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(13):3279-3285
Acenes that are twisted out of planarity are expected to display chiroptical properties. However, the effect of twisting on the chiroptical properties of acenes has not been investigated computationally or experimentally. Herein, we present a computational investigation of the chiroptical properties of anthracenes to pentacenes, combined with an experimental study using a series of helically locked acenes, twisted to different torsional angles in their enantiopure form. The lowest energy transition, which is relatively weak in acenes, becomes dominant in their circular dichroism spectra upon twisting. We find that the rotational strength of acenes consistently increases with increasing twist. The experimental data obtained from enantiopure tethered twistacenes show the same trend as the calculated result, with a strong Cotton effect and anisotropy factor, rendering twisted acenes as excellent chiroptical materials. 相似文献