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Biswas, Anis,Yu, Y. Y.,Bingham, N. S.,Wang, H.,Qin, F. X.,Sun, J. F.,Yu, S. C.,Franco, V.,Srikanth, H.,Phan, M. H. American Institute of Physics 2014 JOURNAL OF APPLIED PHYSICS - Vol.115 No.17
<P>We have studied the impact of structural disorder on the magnetic ordering and magnetocaloric response of amorphous Gd68Ni32 and Gd53Al24Co20Zr3 microwires. We find that the presence of structural disorder significantly broadens the paramagnetic to ferromagnetic (PM-FM) transition and the temperature-dependent magnetic entropy change, while the nature of the second-order magnetic transition and long-range ferromagnetic order are not essentially affected by this effect. The large magnetic moment of Gd and the presence of the long-range ferromagnetic order are believed to result in a large magnetic entropy change, which together with the broadening of the PM-FM transition due to structural disorder contribute to a large refrigerant capacity. The excellent magnetocaloric properties of the amorphous microwires make them very promising candidates for active magnetic refrigeration. (C) 2014 AIP Publishing LLC.</P>
Biswas, S.K.,Baeg, J.O. Pergamon Press ; Elsevier Science Ltd 2013 International journal of hydrogen energy Vol.38 No.34
Herein, we report the preparation, characterization and investigation of previously unexplored W incorporated iron vanadate (FeVO<SUB>4</SUB>) electrodes for solar light driven water oxidation in photoelectrochemical cell. The W incorporated FeVO<SUB>4</SUB> films on F-doped SnO<SUB>2</SUB> substrates have been prepared by layer-by-layer deposition of metal-organic precursor and subsequent thermal decomposition at 550 <SUP>o</SUP>C in air. The synthesized films with a band gap of about 2.06 eV are responsive to visible light up to wavelength of ~600 nm, i.e. being able to harvest ~45% of the solar spectrum. The W incorporated FeVO<SUB>4</SUB> photoanodes are active materials for photoelectrochemical water oxidation and, yield a significantly enhanced (2.5 fold higher) photocurrent in comparison to pristine FeVO<SUB>4</SUB> photoanodes. This improvement can be attributed to increased n-type conductivity by W<SUP>6+</SUP> ion doping in the FeVO<SUB>4</SUB> lattice. The incident photon to current conversion efficiency achieved with developed photoanodes is as high as 6.5% at 400 nm.
Biswas, M.,Biswas, K.,Ghosh, A.K.,Haldar, P.K. Kyung Hee Oriental Medicine Research Center 2009 Oriental pharmacy and experimental medicine Vol.9 No.4
In present study evaluate the analgesic and anti-inflammatory activity of the compound obtained from the petroleum ether (40 - 60$^{\circ}C$) extract of the fruits from Dregea volubilis in Swiss albino mice and in Wister albino rats respectively. Dried and crushed fruits of Dregea volubilis were extracted by petroleum ether (40 - 60$^{\circ}C$), the proper solvent system was developed by TLC and subjected to column chromatography for obtaining the pure compound/s. IR, MASS, NMR (PMR, C13 NMR and DEPT) spectroscopic analysis were done to elucidate the structure of the compound/s. The petroleum ether (40 - 60$^{\circ}C$) extract of the fruits of Dregea volubilis led to isolation of a pentacyclic triterpenoid designated as taraxerone and characterized as D- friedoolean- 14- en, 3 one. Taraxerone had been screened for analgesic activity in Swiss albino mice and anti-inflammatory activity in Wister albino rats at the dose of 5 mg/kg body weight orally and exhibit significant analgesic and anti-inflammatory properties.
Biswas, Tanmay,Datta, Sanjib Kumar,Shaikh, Jinarul Haque Korean Mathematical Society 2016 대한수학회논문집 Vol.31 No.4
The object of the present paper is to obtain new estimates about the (p, q)-th lower order and (p, q)-th weak type of entire functions under some interesting conditions.