33 research outputs found

    A study of the Role of SEBI in regulating the Indian Securities Market

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    Abstract: The structure and processes of the SEBI have been developed over the year. In 1602 when Amsterdam stock exchange was admitted by the East India Company for dealings in its own securities the establishment of the native share and stock Brokers Association (now renamed as Bombay Stock Exchange) in 1875 in the existing India undoubtedly marked a beginning of the stock exchange in India despite being the first ever stock exchange in Asia. The earliest legislative efforts to regulate the securities market in India was made by the Bombay Securities Contracts control act 1925, which was enacted to regulate and control certain contracts acts for purchase and sale of securities in the city of Bombay. Keywords: Security, India, Regulation, SEBI. Title: A study of the Role of SEBI in regulating the Indian Securities Market Author: Moumita Banerjee International Journal of Management and Commerce Innovations ISSN 2348-7585 (Online) Vol. 10, Issue 2, October 2022 - March 2023 Page No: 447-450 Research Publish Journals Website: www.researchpublish.com Published Date: 18-March-2023 DOI: https://doi.org/10.5281/zenodo.7747932 Paper Download Link (Source) https://www.researchpublish.com/papers/a-study-of-the-role-of-sebi-in-regulating-the-indian-securities-marketInternational Journal of Management and Commerce Innovations, ISSN 2348-7585 (Online), Research Publish Journals, Website: www.researchpublish.co

    Competitive metastable behaviours of surface and bulk in Ising ferromagnet

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    The reversal of magnetisation has been studied in a three-dimensional Ising ferromagnet by Monte Carlo simulation with Metropolis single spin flip algorithm using random updating scheme. The outer layers are considered as surface. The surface interacts with core with a relative ferromagnetic interaction strength. Depending on the relative interaction strength, the time of reversal of the surface was found to be different from that of the bulk. For weaker relative strength, surface reversal was found to be faster than that of bulk and vice versa for stronger relative interaction strength. A critical value (RcR_c) of relative interaction strength provides same time of reversal of surface and bulk. This critical relative interaction strength was found to be a function of the temperature (T) and applied magnetic field (h). The scaling relation Rchβf(Thα)R_c \sim h^{-\beta }f(Th^{\alpha }), where α=0.23±0.01\alpha =0.23\pm 0.01 and β=0.06±0.01\beta = -0.06\pm 0.01, has been proposed, numerically by the method of data collapse. The metastable volume fractions, for both surface and bulk, were found to follow the Avrami’s law. The critical relative interaction strength (RcR_c) has been observed to decrease in an exponential (ebL1.5)e^{bL^{-1.5}}) fashion with the system size (L)

    Anisotropy-driven reversal of magnetisation in Blume–Capel ferromagnet: a Monte Carlo study

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    The two-dimensional Spin-1 Blume–Capel ferromagnet is studied by Monte Carlo simulation with Metropolis algorithm. Starting from initial ordered spin configuration, the reversal of magnetisation is investigated in the presence of a magnetic field (h) applied in the opposite direction. The variations of the reversal time with the strength of single-site anisotropy are investigated in details. The exponential dependence was observed. The systematic variations of the mean reversal time with positive and negative anisotropy were found. The mean macroscopic reversal time was observed to be linearly dependent on a suitably defined microscopic reversal time. The saturated magnetisation MfM_f after the reversal was noticed to be dependent of the strength of anisotropy D. An interesting scaling relation was obtained, Mfhβf(Dhα)|M_f| \sim |h|^{\beta }f(D|h|^{-\alpha }) with the scaling function of the form f(x)=11+e(xa)/bf(x)= \frac{1}{1+e^{(x-a)/b}}. The temporal evolution of density of Siz=0S_i^z=0 (surrounded by all Siz=+1S_i^z=+1) is observed to be exponentially decaying. The growth of mean density of Siz=1S_i^z=-1 has been fitted in a function ρ1(t)1a+e(tct)/c\rho _{-1}(t) \sim \frac{1}{a+e^{(t_c-t)/c}}. The characteristic time shows tcerDt_c \sim e^{-rD} and a crossover in the rate of exponential falling is observed at D=1.5D=1.5. The metastable volume fraction has been found to obey the Avrami’s law

    Theoretical studies on switching of magnetisation in thin film

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    In the present chapter, we focus on the switching of magnetisation, or the metastable lifetime of a ferromagnetic system. In this regard, particularly the Ising model and the Blume-Capel model, have been simulated in the presence of an externally applied magnetic field by the Monte-Carlo simulation technique based on the Metropolis algorithm. Magnetisation switching is found to be faster in the presence of disorder, modelled here by a quenched random field. The strength of the random field is observed to play a similar role to that played by temperature. Becker-D\"oring theory of classical nucleation (originally proposed for the spin-1/2 Ising system) has been verified in the random field Ising model. However, a stronger random field affects the nucleation regime. In a cubic Ising lattice, surface reversal time is found to be different from the bulk reversal time. That distinct behaviour of the surface in contrast to the bulk has been studied here by introducing a relative interfacial interaction strength (RR). Depending on RR, temperature, and applied field, a competitive switching of magnetisation of surface and bulk is noticed. The effect of anisotropy (DD) on the metastable lifetime has been investigated. We report a linear dependency of the mean macroscopic reversal time on a suitably defined microscopic reversal time. The saturated magnetisation MfM_f, after the reversal, is noticed to be strongly dependent on DD. MfM_f, DD, and hh (field) are found to follow a proposed scaling relation. Finally, Becker-D\"oring theory as well as Avrami's law are verified in spin-ss Ising and Blume-Capel models. The switching time depends on the number of accessible spin states.Comment: Invited review article, to appear in Comprehensive Materials Processing (2E), Elsevie
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