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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.
Ramesh, S.,Dhanalakshmi, B.,Sekhar, B. Chandra,Rao, P. S. V. Subba,Rao, B. Parvatheeswara,Kim, CheolGi American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.10
<P>Cobalt substituted Ni-Zn ferrite nanoparticles with the formula, Ni0.4Zn0.6-xCoxFe2O4, where x varies from 0.00 to 0.25 in steps of 0.05, were prepared by sol-gel autocombustion method and analyzed for their structural and magnetic properties. The synthesized nanoparticles were subjected to X-ray analysis, transmission electron microscopy, Fourier transform infrared spectroscopy, thermal analysis and magnetic measurements. The X-ray patterns confirm cubic spinel structures with the crystallite sizes in the range from 31.72 nm to 36.87 nm. The particle sizes estimated using electron micrographs are in good agreement with the crystallite sizes obtained from the X-ray data. Infrared data confirms the spinel structure by showing Fe-A-O and Fe-B-O stretching vibrations while the thermal data hints at a slight weight gain due to oxidation. The obtained magnetic data suggests a marginal increase in saturation magnetization with the Co substitution at x = 0.10 and 0.25. The results are analyzed in terms of the compositional and structural modifications, and it was found that the variation of magnetic moment was governed by a corresponding change in the oxygen positional parameter in these materials.</P>
Ramesh,Narayan,Duda,J . L . 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
Theories based on free-volume concepts have been developed to characterize the self and mutual diffusion coefficients of low molecular weight penetrants in rubbery and glassy polymer-solvent systems. These theories are applicable over a wide range of temperatures and concentrations. In this paper, two alternative freevolume based approaches used to evaluate the solvent self-diffusion in glassy polymer-solvent systems are compared in terms of their differences and applicability.
Adsorption Ability of Activated Carbon for Organic Removal from Wastewater
( Ramesh T. ),심왕근,이재욱,문희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
In the field of wastewater treatment, adsorption using activated carbon has proved to be one of the most viable and simple method for the removal of organic carbon, especially those compounds that are chemically and biologically stable. However, the ability of activated carbon to remove organic material largely depends on their physical properties and the material from which the carbon is made. This study analyses the capacity of three different powdered activated carbons (PAC); wood based, coal based and coconut based and granular activated carbon (GAC), in the removal of dissolved organic carbon (DOC) from wastewater. The performance of PAC was far more superior compared to GAC in the ability to remove organic matter. The results indicated that 10 mg/L of wood based PAC was able to remove 90 % of DOC from wastewater with 4.7 mg/L of initial DOC. On the other hand the organic removal ability of 10 mg/L of GAC was only 25 %. The optimum pH values for the three PACs are 8, 9 and 10 for wood based, coal based and coconut based respectively. The nature of DOC removal at various influent organic concentration was also studied for the PACs.
Polymeric and lipid-based drug delivery systems for treatment of glioblastoma multiforme
Ramesh Duwa,Fakhrossadat Emami,이수연,정지헌,육심명 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
Glioblastoma multiforme (GBM) is the most aggressive, malignant brain tumor found in adults, and has ashort median survival time (MST). GBM is a heterogeneous group of brain tumors, is highly prone todevelop resistance and likely to recur. In the context of GBM, the delivery of anti-cancer drugs ischallenging because the blood brain barrier (BBB) restricts the passage of small molecules. Currently,nanomedicines based on liposomes, micelles, polymeric nanoparticles, and microparticles have attractedmuch attention, because they can cross the BBB and deliver anti-cancer drugs specifically to brain tumors. In this context, hydrogel-based systems incorporating nanoparticles, implantable carmustine wafers,microspheres, and lipid-based nanoparticles now appear to offer more effective, safer treatmentstrategies than conventional chemotherapeutic regimens. This review describes different polymerichydrogel, chitosan, dendrimers, wafers, microspheres, and lipid-based nanoparticles like liposomes andsolid-lipid nanoparticles that offers prominent strategies for the treatment and diagnosis of GBM.
Ramesh, Sivalingam,Kim, Heung Soo,Lee, Young-Jun,Hong, Gwang-Wook,Kim, Joo-Hyung Springer US 2017 NANOSCALE RESEARCH LETTERS Vol.12 No.1
<P>It is demonstrated in this paper that silica nanoparticles coated with core/shell gold provide efficient thermal, optical, and morphological properties with respect to the cellulose-polyhedral oligomeric silsesquioxanes (POSS) hybrid system. The one-step synthesis of a silica/gold nanocomposite is achieved with a simultaneous hydrolysis and reduction of gold chloride in the presence of formic acid, and the trimethoxysilane group acts as a silica precursor. The focus here comprises the synthesis of cellulose-POSS and silica/gold hybrid nanocomposites using the following two methods: (1) an in situ sol-gel process and (2) a polyvinyl alcohol/tetrakis (hydroxymethyl)phosphonium chloride process. Accordingly, the silica/gold core/shell nanoparticles are synthesized. The growth and attachment of the gold nanoparticles onto the functionalized surface of the silica at the nanometer scale is achieved via both the sol-gel and the tetrakis (hydroxymethyl) phosphonium chloride processes. The cellulose-POSS-silica/gold nanocomposites are characterized according to Fourier transformed infrared spectroscopy, Raman, X-ray diffraction, UV, photoluminescence, SEM, energy-dispersive X-ray spectroscopy, TEM, thermogravimetric, and Brunauer-Emmett-Teller analyses.</P>
Ramesh, T.,Kim, S.W.,Sung, J.H.,Hwang, S.Y.,Sohn, S.H.,Yoo, S.K.,Kim, S.K. Pergamon Press ; Elsevier Science Ltd 2012 Experimental Gerontology Vol.47 No.1
The intracellular levels of oxidant and antioxidant balances are gradually distorted during the aging process. An age associated elevation of oxidative stress occurring throughout the lifetime is hypothesized to be the major cause of aging. The present study was undertaken to evaluate the putative antioxidant activity of the fermented Panax ginseng extract (GINST) on lipid peroxidation and antioxidant status of major organs of aged rats compared to young rats. Increased levels of aspartate aminotransferase (AST), alanine aminotransferase (ALT), urea and creatinine were observed in the serum of aged rats. Increased levels of malondialdehyde (MDA) and significantly lowered activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR) and glutathione-S-transferase (GST) were observed in the liver, kidneys, heart and lungs of aged rats, when compared with those in young rats. Quantitative analysis of the non-enzymatic antioxidants such as reduced glutathione (GSH), ascorbic acid and α-tocopherol levels showed significantly lower values in the liver, kidneys, heart and lungs of aged rats. On the other hand, administration of the fermented Panax ginseng extract (GINST) to aged rats resulted in increased activities of SOD, CAT, GPx, GR and GST as well as elevation in GSH, ascorbic acid and α-tocopherol levels. Besides, the level of MDA, AST, ALT, urea and creatinine were reduced on administration of GINST to aged rats. These results suggested that treatment of GINST can improve the antioxidant status during aging, thereby minimizing the oxidative stress and occurrence of age-related disorders associated with free radicals.