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- 저자 : S.P. Bera (검색결과 7 건)
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Cu<sub>2</sub>S-deposited mesoporous NiO photocathode for a solar cell
Rhee, J.H.,Lee, Y.H.,Bera, P.,Seok, S.I. North Holland ; Elsevier Science Ltd 2009 Chemical physics letters Vol.477 No.4
The p-type Cu<SUB>2</SUB>S layer is deposited onto p-type mesoporous NiO electrode by spray pyrolysis deposition method using alcoholic solution of ethylenediamine-copper(II) complex and thiourea. A solar cell using Cu<SUB>2</SUB>S-deposited NiO mesoporous photocathode has been fabricated for the first time. The incident photon to current conversion efficiency (IPCE) values are found to be 0.8-1.8% for the newly designed NiO/Cu<SUB>2</SUB>S solar cell. It was shown that the p-type NiO/Cu<SUB>2</SUB>S structure could be successfully utilized to fabricate p-type solar cell and the possible mechanism for charge transfer is also discussed.
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Bera, P.,Kim, C.H.,Seok, S.I. Elsevier Sequoia [etc.] 2009 Inorganica chimica acta Vol.362 No.8
Lead(II) complexes of S-methyldithiocarbazate (SMDTC), [Pb(SMDTC)(NO<SUB>3</SUB>)<SUB>2</SUB>] (1) and S-benzyldithiocarbazate (SBDTC), [Pb(SBDTC)(NO<SUB>3</SUB>)<SUB>2</SUB>] (2) have been synthesized for the first time and characterized by elemental analysis, IR and TGA techniques. The complexes were obtained by addition of the appropriate ligand to an aqueous ethanolic solution of lead(II) nitrate in 1:1 molar ratio. The X-ray crystal structure of complex 1 has been determined by single crystal X-ray diffractometry. In complex 1, lead(II) is in a nine coordinated sphere with seven oxygen atoms of the nitrate groups and thione sulfur, β-nitrogen of neutral bidentate NS chelating ligand. Three nitrate groups act as bidentate chelating whereas the fourth nitrate group is coordinating to the central lead(II) and at the same time it bridges with neighboring lead(II) atom. Coordination geometry of the central lead(II) atom has a tricapped trigonal prismatic arrangement with streochemically inactive lone pair. The lead atoms are linked into polymeric chains and these chains form twin polymeric ribbons linked through bridging oxygen atoms. The N-H...O hydrogen bond network between N<SUB>SMDTC</SUB> and O<SUB>nitrate</SUB> atom leads to self-assembled molecular conformation and stabilizes the crystal structure. The complex 2 with similar spectral and thermal behavior is expected to have a tricapped trigonal prismatic structure. The thermal behavior studies shows that the complexes start to decompose at relatively low temperature (ca. 110<SUP>o</SUP>C) to give PbS residue.
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Magnetic ground state of the multiferroic hexagonal LuFeO3
Suresh, Pittala,Vijaya Laxmi, K.,Bera, A. K.,Yusuf, S. M.,Chittari, Bheema Lingam,Jung, Jeil,Anil Kumar, P. S. American Physical Society 2018 Physical Review B Vol.97 No.18
<P>The structural, electric, and magnetic properties of bulk hexagonal LuFeO3 are investigated. Single phase hexagonal LuFeO3 has been successfully stabilized in the bulk form without any doping by sol-gel method. The hexagonal crystal structure with P6(3)cm space group has been confirmed by x-ray-diffraction, neutron-diffraction, and Raman spectroscopy study at room temperature. Neutron diffraction confirms the hexagonal phase of LuFeO3 persists down to 6 K. Further, the x-ray photoelectron spectroscopy established the 3+ oxidation state of Fe ions. The temperature-dependent magnetic dc susceptibility, specific heat, and neutron-diffraction studies confirm an antiferromagnetic ordering below the Neel temperature (T-N) similar to 130 K. Analysis of magnetic neutron-diffraction patterns reveals an in-plane (ab-plane) 120 degrees antiferromagnetic structure, characterized by a propagation vector k = (0 0 0) with an ordered moment of 2.84 mu(B)/Fe3+ at 6 K. The 120 degrees antifferomagnetic ordering is further confirmed by spin-orbit coupling density functional theory calculations. The on-site coulomb interaction (U) and Hund's parameter (J(H)) on Fe atoms reproduced the neutron-diffraction Gamma(1) spin pattern among the Fe atoms. P-E loop measurements at room temperature confirm an intrinsic ferroelectricity of the sample with remnant polarization P-r similar to 0.18 mu(C) cm(2). A clear anomaly in the dielectric data is observed at similar to T-N revealing the presence of magnetoelectric coupling. A change in the lattice constants at T-N has also been found, indicating the presence of a strong magnetoelastic coupling. Thus a coupling between lattice, electric, and magnetic degrees of freedom is established in bulk hexagonal LuFeO3.</P>
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A delay dynamic model for HIV infected immune response
S.P. Bera,A. Maiti,G.P. Samanta 한국전산응용수학회 2015 Journal of applied mathematics & informatics Vol.33 No.5
Human Immune Deficiency Virus (or simply HIV) induces a persistent infection that leads to AIDS causing death in almost every infected individual. As HIV affects the immune system directly by attacking the CD4+ T cells, to exterminate the infection, the natural immune system produces virus-specific cytotoxic T lymphocytes(CTLs) that kills the infected CD4+ T cells. The reduced CD4+ T cell count produce reduced amount of cytokines to stimulate the production of CTLs to fight the invaders that weakens the body immunity succeeding to AIDS. In this paper, we introduce a mathematical model with discrete time-delay to represent this cell dynamics between CD4+ T cells and the CTLs under HIV infection. A modified functional form has been considered to describe the infection mechanism. Characteristics of the system are studied through mathematical analysis. Numerical simulations are carried out to illustrate the analytical findings.
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Bera, D,Maslov, S,Lei Qian,Jae Soo Yoo,Holloway, P H IEEE 2010 Journal of display technology Vol.6 No.12
<P>A cerium-doped gadolinium-yttrium garnet yellow emitting phosphor was used to optimize the phosphor layer for down-conversion of blue light from InGaN inorganic light-emitting diode (iLED) to white. Optical, morphological and elemental characterizations of phosphor were carried out. Various amounts of the phosphor were dispersed in polymethyl methacrylate polymer (PMMA)-chlorobenzene solution. The phosphor layer thickness was optimized by varying the volume of the phosphor-PMMA mixture. Using a blue emitting (458 nm) iLED, a two times larger luminance efficacy (lm/W) was obtained from down-converted white light using a 37.5 μm thick 25 mm × 25 mm film prepared from 30 mg of phosphor in 500 μl of the PMMA-chlorobenzene solution.</P>
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A DELAY DYNAMIC MODEL FOR HIV INFECTED IMMUNE RESPONSE
BERA, S.P.,MAITI, A.,SAMANTA, G.P. The Korean Society for Computational and Applied M 2015 Journal of applied mathematics & informatics Vol.33 No.5
Human Immune Deficiency Virus (or simply HIV) induces a persistent infection that leads to AIDS causing death in almost every infected individual. As HIV affects the immune system directly by attacking the CD4+ T cells, to exterminate the infection, the natural immune system produces virus-specific cytotoxic T lymphocytes(CTLs) that kills the infected CD4+ T cells. The reduced CD4+ T cell count produce reduced amount of cytokines to stimulate the production of CTLs to fight the invaders that weakens the body immunity succeeding to AIDS. In this paper, we introduce a mathematical model with discrete time-delay to represent this cell dynamics between CD4+ T cells and the CTLs under HIV infection. A modified functional form has been considered to describe the infection mechanism. Characteristics of the system are studied through mathematical analysis. Numerical simulations are carried out to illustrate the analytical findings.
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