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- 저자 : B. R. Pati (검색결과 4 건)
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Pati Dinesh Kumar,Das Piyush R.,Parida B. N.,Behera B.,Padhee R. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
The research article reports the various functional properties of barium strontium titanate [(Ba 0.8Sr0.2)TiO 3]-modifi ed lead iron niobate [Pb(Fe 0.5Nb0.5)O3] ceramic oxide synthesized by the solid-state method. Rietveld and POWD studies proved that the composition crystallizes in tetragonal structure as the primary phase. Ti–O perovskite vibrations were studied by Fourier transform infrared (FTIR) analysis. The TiO 6 octahedral stretching, O–Ti–O vibrations and Nb–O–Fe stretching vibrations of PFN were studied by Raman spectroscopy. The broadening of Raman modes was analysed in the framework of Heisenberg’s uncertainty principle using phonon confi nement model. Field emission gun-scanning electron microscopy (FESEM) and energy-dispersive X-ray spectroscopy (EDS) studies revealed the dense grain distributions, grain growth and purity. UV–visible analysis was done to study the narrow band gap and Urbach energy. The eff ect of structural distortions and electronegativity on band gap were analysed. The photocatalytic response was studied by estimating the band edge levels +/H 2 1 Introduction The search for room temperature multiferroic materials is one of the most vital aspects in the fi eld of material science because of its enormous applications in multi- functional devices. Lead iron niobate (PFN) belongs to the family of multiferroic electroceramics with perovskite structure having formulation ABO 3 or A(B′B″)O3, where B′ and B″ are, respectively, low and high valence cati- ons like Fe 3+ and Nb 5+. The 3d 5 electrons of Fe 3+ boosts magnetic orders and the 6s 2 electrons of Pb 2+ generate the ferroelectric orderings [ 1 ]. PFN ceramics are widely used in device applications [ 2 –4 ] such as multilayer capaci- tors, actuators, transducers and so on due to their large values of relative permittivity, diff use phase transition Vol.:(0123456789) 1 3 using Mulliken’s model. The evaluated conduction band minimum level is suffi ciently negative with respect to the H (0 eV) level, which strongly signifi es the possible occurrence of the photocatalytic hydrogen emission reaction. A detailed electrical analysis was done to study the dielectric properties, relaxation, negative temperature coeffi cient of resistance (NTCR)-type response and DC conductivity. AC conductivity studies revealed the presence of overlapping large polaron tun- nelling (OLPT) model. The eff ect of oxygen vacancies on relaxation and its correlation with activation energy were discussed. Multiferroic nature was confi rmed from room temperature studies of P–E and M–H hysteresis loops. Fe 3+ Fe 3+ (F centre) exchange and Fe 3+ Fe 2+ double exchange mechanisms were discussed. A magnetic improvement was noticed on reduction of temperature to 50 K. The simultaneous existence of weak ferroelectricity and ferromagnetism is one of the interesting outcomes of the present study, which may provide a new multiferroic material for advanced electro-optical applications.
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Rank Preservers of Matrices Over Max Algebra
BAPAT, R. B.,PATI, SUKANTA,SONG, SEOK-ZUN 濟州大學校 基礎科學硏究所 2001 基礎科學硏究 Vol.14 No.2
The max algebra consists of the nonnegative real numbers equipped with two binary operations, maximization and multiplication. We consider the semimodules over max algebra and study the properties of the weak basis and weak dimension of the semi- modules. Moreover, we obtain the characterizations of those linear operators that preserve rank of matrices over max-algebra.
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K. Krishna Prasad,S. Venkata Mohan,Y. Vijaya Bhaskar,S. V. Ramanaiah,V. Lalit Babu,B. R. Pati,P. N. Sarma 한국미생물학회 2005 The journal of microbiology Vol.43 No.3
The feasibility of laccase production by immobilization of Pleurotus ostreatus 1804 on polyurethane foam (PUF) cubes with respect to media composition was studied in both batch and reactor systems. Enhanced laccase yield was evidenced due to immobilization. A relatively high maximum laccase activity of 312.6 U was observed with immobilized mycelia in shake flasks compared to the maximum laccase activity of free mycelia (272.2 U). It is evident from this study that the culture conditions studied, i.e. biomass level, pH, substrate concentration, yeast extract concentration, Cu2+ concentration, and alcohol nature, showed significant influence on the laccase yield. Gel electrophoretic analysis showed the molecular weight of the laccase produced by immobilized P. ostreatus to be 66 kDa. The laccase yield was significantly higher and more rapid in the packed bed reactor than in the shake flask experiments. A maximum laccase yield of 392.9 U was observed within 144 h of the fermentation period with complete glucose depletion.
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Prasad K. Krishna,Mohan S. Venkata,Bhaskar Y. Vijaya,Ramanaiah S. V.,Babu V. Lalit,Pati B. R.,Sarma P. N. The Microbiological Society of Korea 2005 The journal of microbiology Vol.43 No.3
The feasibility of laccase production by immobilization of Pleurotus ostreatus 1804 on polyurethane foam (PUF) cubes with respect to media composition was studied in both batch and reactor systems. Enhanced laccase yield was evidenced due to immobilization. A relatively high maximum laccase activity of 312.6 U was observed with immobilized mycelia in shake flasks compared to the maximum laccase activity of free mycelia (272.2 U). It is evident from this study that the culture conditions studied, i.e. biomass level, pH, substrate concentration, yeast extract concentration, $Cu^{2+}$ concentration, and alcohol nature, showed significant influence on the laccase yield. Gel electrophoretic analysis showed the molecular weight of the laccase produced by immobilized P. ostreatus to be 66 kDa. The laccase yield was significantly higher and more rapid in the packed bed reactor than in the shake flask experiments. A maximum laccase yield of 392.9 U was observed within 144 h of the fermentation period with complete glucose depletion.
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