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Raghunathpur, India

De B.,Moulana Azad College | Sau G.,Beramara RamChandrapur High School | Biswas S.K.,West Kodalia Adarsha Siksha Sadan | Bhattacharyya S.,Indian Statistical Institute | Guptaroy P.,Raghunathpur College
International Journal of Modern Physics A | Year: 2010

The transverse momentum spectra of secondary η particles produced in P+P, D + Au and Au + Au interactions at √sNN = 200 GeV at different centralities have been studied in the light of a nonextensive thermodynamical approach. The results and the possible thermodynamical insights, thus obtained, about the hadronizing process have also been discussed in detail. © 2010 World Scientific Publishing Company.

Biswas B.,Raghunathpur College | Hung S.-P.,National Cheng Kung University | Tsai H.-L.,National Cheng Kung University | Ghosh R.,University of Burdwan | Kole N.,Raghunathpur College
Journal of Coordination Chemistry | Year: 2012

An organic-inorganic hybrid solid [(dpaH) +(NCS) -] (1) (dpa = 2,2'-dipyridylamine) based on an anionic template NCS - has been synthesized. Single crystal X-ray structural analysis reveals that NCS - templates assemble dpaH + units into a 3-D layer structure along the b axis through strong hydrogen bonding. Molecular salt 1 works as an anion-binder efficiently and selectively for recognition and sensing purposes in aprotic solvents. This receptor shows changes both in its UV-Vis absorption and fluorescence emission spectra upon the addition of F -, resulting in high selectivity for fluoride detection in CH 3CN. It is promising to use these systems in various sensing applications. © 2012 Taylor & Francis.

Biswas B.,Raghunathpur College | Mitra P.,Indian Association for The Cultivation of Science | Ghosh R.,University of Burdwan
Journal of the Indian Chemical Society | Year: 2013

A mononuclear manganese(II) complex [Mn(phen)2(OH 2)2][Mn(phen)2(OH2)Cl](NO 3)3 (1) containing 1,10-phenanthroline [phen = 1,10-phenanthroline] ligand has been synthesized and crystallographically characterized. The oxidation level of the manganese atoms in two asymmetric units was determined by bond valence sum calculation (BVS). The DNA binding study has been explored by spectrophotometric and spectrofluorimetric measurements.

Patra M.,Raghunathpur College | Majumdar S.,Indian Association for The Cultivation of Science | Giri S.,Indian Association for The Cultivation of Science | Xiao Y.,Julich Research Center | Chatterji T.,Laue Langevin Institute
Journal of Alloys and Compounds | Year: 2012

NdAl 2 and TmAl 2 single-crystals display Curie temperature (T C) at 76.5 and 6.0 K, which are significantly close to liquid nitrogen and helium (T He) temperatures, respectively. Maximum entropy-change (-ΔS M) for 0-70 kOe are 35.9 and 8.9 J/kg-K at T C with large cooling efficiency 655 and 398 J/kg for TmAl 2 and NdAl 2, respectively. Adiabatic temperature change at T He for 0-20 kOe is 3.7 K for TmAl 2. This is promising for cryogenic refrigeration down to sub-Kelvin temperature using an electromagnet. The -ΔS M for SmAl 2 is low (∼0.5 J/kg-K at T C for 0-70 kOe). The direction-dependent anisotropy in thermal and field variations of ΔS M, and a reasonable correlation between ΔS M and magnetoresistance are realized for NdAl 2 and TmAl 2. © 2012 Elsevier B.V. All rights reserved.

Guptaroy P.,Raghunathpur College | Guptaroy S.,Basantidevi College
Chinese Physics Letters | Year: 2014

Experiments involving proton - proton collisions at energies √s NN = 0.9, 2.76 and 7 TeV in the large hadron collider produce a vast amount of high-precision data. In this work, we analyze two aspects of the measured data, viz., (i) the pT-spectra of pions, kaons, proton-antiproton at the above-mentioned energies, and (ii) some of their very important ratio behaviors, in the light of a version of the sequential chain model. The agreements between the measured data and the model-based results are generally found to be modestly satisfactory. © 2014 Chinese Physical Society and IOP Publishing Ltd.

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