American Journal of Physical Sciences and Applications (AJPSA)

                                                                                                                                 

                                                                                                                                 US:ISSN 2644-0792

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Current Issues

 

A real space approach to study the effect of disorder on the ±s-wave state of the iron-based superconductors.

Author:  Subhadeep Bandyopadhyay, Shreemoyee Ganguly and Prashant Singh

Abstract:

In this work we have studied a model two band Hubbard Hamiltonian which represents a “±swave superconductor”. A iron-pnictide superconductor has this symmetry of superconducting order parameter. We have developed a real space based method to study the effect of substitutional disorder on diagonal and off-diagonal terms of the Hamiltonian of the system. We find that if the form of the intraband pairing potential is nonlocal then superconductivity survives even when the repulsive interband interaction is dominant.

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On the size control of nanoparticles: synthesis without chemicals

Author:  Shyamal Mondal, Arpan maiti and S. R. Bhattacharyya

Abstract:

Nanoparticles and subnanometer size particles of metal or semiconductor have a very important role in preventing environmental degradation which is alarming now a days. Threat to environmental damage can be averted by resorting to clean energy sources instead of conventional fossil fuel such petroleum, coal, etc., and controlling the toxic materials from spreading as well as reducing their life time by catalysing their degradation.  Catalyzing energy conversion and degrading toxic materials is possible by the use of metal nanoparticles of specific size ranges. In this article, a novel method of production of nanoparticle with precise control on their size is briefly described without the use of chemical reagents. 

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Carbide fire in an acetylene gas plant – a case study

Author:  G. Bhattacharjee, G. Bera, S. K. Das and B. Singha

Abstract:

This study deals with an incidence of small fire breaks in an industrial gas plant, manufacturing acetylene gas. Calcium carbide is the raw material for acetylene production. Calcium carbide is stored in a bulk quantity in carbide godown near acetylene plant. It also explains the probable causes, preventive and corrective measures. What-if analysis and Cause – consequence analysis were used to identify the possible errors and the unsafe activities. Emergency procedures are also discussed. Finally some useful recommendations are listed which has been drawn for industrial facilities storing calcium carbide and preparing acetylene.

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Perspectives of Quantitative Depth Profiling

Author:  Biswajit Saha and Rajiv K. Chouhan

Abstract:

This article primarily deals with the compensation of ‘matrix effect’ in secondary ion mass spectrometry (SIMS) for direct quantitative analysis of materials using MCs+-SIMS approach. Emphasis has been given on exploring the formation mechanisms of MCsn+ (n = 1, 2,..) molecular ions (M denotes the element to be analyzed and Cs+ is the bombarding ion) emitted in the SIMS process. Following a brief introduction on SIMS, a study on MCsn+ molecular ions emitted from various metal and semiconductor targets under Cs+ primary bombardment has been discussed.

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Another New Family of Gold-Like Sequences

Author:  Sankhadip Roy and Arnab Ganguly

Abstract:

In this correspondence, for a positive odd integer n, a new family U of binary sequences with 2n+1 sequences of length 2n - 1 taking three valued nontrivial correlations -1 and is presented. This family U is consturcted using the families introduced by Boztas and Kumar, Kim and No. This family has the same correlation distribution as that of the well-known Gold sequences. So this family can be considered as another new class of Gold-like sequences.

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