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Fixed point theorems for weak contraction in Intuitionistic fuzzy metric space
Ramesh Kumar Vats,Ramesh Kumar Vats 호남수학회 2016 호남수학학술지 Vol.38 No.2
The notion of weak contraction in intuitionistic fuzzy metric space is well known and its study is well entrenched in the literature. This paper introduces the notion of $(\psi,\alpha,\beta)$-weak contraction in intuitionistic fuzzy metric space. In this contrast, we prove certain coincidence point results in partially ordered intuitionistic fuzzy metric spaces for functions which satisfy a certain inequality involving three control functions. In the course of investigation, we found that by imposing some additional conditions on the mappings, coincidence point turns out to be a fixed point. Moreover, we establish a theorem as an application of our results.
Structural studies of a green-emitting terbium doped calcium zinc phosphate phosphor
Ramesh, B.,Dillip, G.R.,Rambabu, B.,Joo, S.W.,Raju, B. Deva Prasad Elsevier 2018 Journal of molecular structure Vol.1155 No.-
<P><B>Abstract</B></P> <P>In this study, a new green emitting CaZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Tb<SUP>3+</SUP> phosphors were synthesized through solid-state reaction route. The phosphors were characterized structurally by X-ray diffraction, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). All the synthesized phosphors were crystallized in triclinic crystal structure with <I>P</I> 1 ¯ space group. The phosphate groups in the phosphors were confirmed by FTIR analysis. The surface elements O <I>1</I>s, P <I>2</I>p, Ca <I>2</I>p, Zn <I>2</I>p and Tb 3<I>d</I> were studied by high-resolution XPS spectra. Upon excitation at 378 nm, the dominant green emission of CaZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Tb<SUP>3+</SUP> phosphors at 542 nm were noticed in the emission spectra. For various emission wavelengths (at 435 and 489 nm) and constant excitation wavelength (at 378 nm), the decay curves have shown two different decay dynamics of phosphors. The lighting properties such as Commission International de l’Eclairage (<I>x</I> = 0.319, <I>y</I> = 0.398) and color temperature (5995 K) were calculated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A green emitting CaZn<SUB>2</SUB>(PO<SUB>4</SUB>)<SUB>2</SUB>:Tb<SUP>3+</SUP> phosphors were synthesized. </LI> <LI> Chemical bonds of PO, CaO, ZnO and TbO were investigated by XPS. </LI> <LI> The phosphor has two different decay dynamics upon various emissions. </LI> <LI> Chromaticity coordinates were located in green region of visible spectrum. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ramesh, Sivalingam,Karuppasamy, K.,Msolli, Sabeur,Kim, Hyun-Seok,Kim, Heung Soo,Kim, Joo-Hyung The Royal Society of Chemistry 2017 New journal of chemistry Vol.41 No.24
<P>Nitrogen doped graphene oxide (NGO) has been widely used to investigate active electrode materials for high-performance supercapacitors. NGO has attracted wide attention due to the efficient method of doping with GO, which can increase the electron mobility, leading to desirable electrochemical properties. Therefore, in the present study we focus on the ternary hybrid composite of NiO/MnO2@nitrogen-doped graphene oxide, which was synthesized <I>via</I> a hydrothermal process. The synthesized hybrid nanocomposite was characterized using Raman spectra, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), and field-emission transmission electron microscopy (FE-TEM). The structural and morphological studies of the hybrid nanocomposite shows its nanocrystalline behaviour. The nanocrystalline hybrid composite exhibited a high specific capacitance of 1490 F g<SUP>−1</SUP> at a current density of 0.5 A g<SUP>−1</SUP>, energy density of 477 W h kg<SUP>−1</SUP>, and power density of 1844 W kg<SUP>−1</SUP>, together with good rate capability and cyclic stability. The results show a good specific capacitance retention of ∼98% after 2000 continuous charge-discharge cycles; this indicates that the hybrid nanocomposite can be a promising electroactive material for supercapacitors. The improved performance of the NiO@MnO2/NGO electrode structure means that it offers an effective way to fabricate high performance supercapacitors.</P>
Ramesh Prasad Pandey,Le Tai Feng,Mi Kyoung Kim,Jae Kyung Sohng 한국당과학회 2012 한국당과학회 학술대회 Vol.2012 No.1
A novel GT1 family glycosyltransferase, YjiC from Bacillus licheniformis ATCC 14580 has been PCR amplified, cloned, and expressed in E. coli BL21 (DE3) expression host. The expression of 396 amino acid long gene generated ~45 kDa N-terminal his-tag protein. The protein has been purified and used for the in vitro glycosylation of phloretin. Moreover, the enzyme was also applied for the in vivo glycosylation of the same phloretin molecule. The in vitro and in vivo study found that YjiC can glycosylate at different positions of hydroxyl groups of phloretin molecule very efficiently with conversion rate of ~98%. Four different products has been identified from the in vitro as well as in vivo reaction as phloretin-2’-glucoside, phloretin-4’-glucoside, and two different diglucosides of phloretin. All the products have been confirmed by TLC, HPLC, LC-MS, and former two products has been further confirmed by NMR analysis.
Does predation pressure drive heronry birds to nest in the urban landscape?
Ramesh Roshnath,Kunjikandi Athira,Palatty Allesh Sinu 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.2
Predation is an important selective force that determines breeding success in all animals. Animals adopt a range of antipredatory strategies to overcome predation pressure in the breeding site, which is also a major predation ground. Birds mitigate this pressure through parental care, colonial or group nesting, and selecting habitats that are predicted to hold less number and diversity of predators. Heronry birds' increasing use of urban habitats for breeding has been suggested as a measure to avoid predation pressure, despite quantitative support for this argument is lacking. We tested this hypothesis by comparing diversity, abundance, and frequency of predation attempts of birds of prey on heronries of wild (mangrove forest) and urban habitats. The house crow (Corvus splendens), brahminy kite (Haliastur indus), and black kite (Milvus migrans) were the major birds of preys in mangrove forests and urban areas. The predators partitioned the nest resources; the kites preyed the chicks, and the crows preyed the eggs. The abundance of avian predators and the frequency of successful predation of eggs and chicks were significantly lower in urban heronries compared with mangroves. Our results suggest that predation might be a reason for the birds to switch to urban habitats for breeding.