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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 Duwa,정지헌,육심명 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
Ovarian cancer is the most significant cause of gynecological cancer mortality, with the majority ofwomen with advanced disease. Although surgery and chemotherapy can enhance survival rates, the 5-year survival [2TD$DIF]rates remain low at 45%. So, alternative treatment options need to be implemented toimprove therapeutic outcomes. In the ovarian cancer tumor, the presence of T cells helps to improve theprogression-free and overall survival, whereas a poor prognosis corresponds to the presence ofregulatory T cells and expression of T cells inhibitory molecules. Analyzing the important role of theseimmune systems in cancer management, immunotherapy may create a sustained response to recurringovarian cancer cells in the immune system. In addition, by boosting anti-tumor immune response,women’s prognosis with this lethal disease can be significantly influenced. Different immunotherapeuticstrategies and nanoparticle-based strategies were used as potential treatment options to challengetumor progression. This review discusses cytokine therapy, peptide vaccine, monoclonal antibody,dendritic cell-based vaccine, adoptive T cells transfer, and immune checkpoint inhibitors as well asdifferent nanoparticles such as poly (lactic-co-glycolic) acid nanoparticles, polyethyleneimine-basednanoparticles, and liposomes that offer a new paradigm in the treatment of ovarian cancer.
Ramesh, Aruna,Soroushian, Sheila,Ganguly, Rumpa Korean Academy of Oral and Maxillofacial Radiology 2013 Imaging Science in Dentistry Vol.43 No.4
Purpose: This study was performed to assess the correlation of calcified carotid atheromatous plaque (CCAP), the mandibular cortical index, and periodontal bone loss in panoramic radiographs. Materials and Methods: One hundred eighty-five panoramic radiographs with CCAP and 234 without this finding were evaluated by 3 observers for the presence of osseous changes related to osteoporosis and periodontal bone loss. Chi-squared and Mann-Whitney U tests were used to compare the two groups for an association of CCAP with the mandibular cortical index and periodontal bone loss, respectively. Results: There was a statistically significant coincidence of CCAP and osseous changes related to osteopenia/osteoporosis, with a p-value <0.001. There was no statistically significant coincidence of CCAP and periodontal bone loss. When comparing the 2 groups, "With CCAP" and "Without CCAP", there was a statistically significant association with the mean body mass index (BMI), number of remaining teeth, positive history of diabetes mellitus, and vascular accidents. There was no statistically significant association with gender or a history of smoking. Conclusion: This study identified a possible concurrence of CCAP and mandibular cortical changes secondary to osteopenia/osteoporosis in panoramic radiographs. This could demonstrate the important role of dental professionals in screening for these systemic conditions, leading to timely and appropriate referrals resulting in early interventions and thus improving overall health.
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, S.,Yang, E.H.,Jung, J.S.,Moon, D.J. Pergamon Press ; Elsevier Science Ltd 2015 International journal of hydrogen energy Vol.40 No.35
Low temperature hydrogen production from stream reforming of glycerol is carried out over copper decorated perovskite catalysts under vapor phase reaction conditions. Among the catalysts studied LaNi<SUB>0.9</SUB>Cu<SUB>0.1</SUB>O<SUB>3</SUB> showed the best performance with 73% glycerol conversion and 67% hydrogen selectivity. The chemical and structural properties of catalysts before and after the reaction were studied by X-ray diffraction, CO<SUB>2</SUB>-TPD and TPR, TGA, TEM and XPS. When the catalysts were reduced with H<SUB>2</SUB>, perovskite structure decomposes to La<SUB>2</SUB>O<SUB>3</SUB>, Ni and Cu, Cu deposits on Ni nano particles were generated, thereby forming Cu/Ni nano catalysts. Cu decoration resulted in, higher reduction of active Ni species with moderate basicity, good catalytic activity which was further decreased with increase in Cu concentration. The catalyst (LaNi<SUB>0.9</SUB>Cu<SUB>0.1</SUB>O<SUB>3</SUB>) did not change any activity till 24 h in time-on-steam at 650 <SUP>o</SUP>C. TGA analysis revealed that copper decorated catalyst has better resistance to coke deposition compared to pervoskite catalysts.
Ramesh, Sivalingam,Kim, Heung Soo,Haldorai, Yuvaraj,Han, Young-Kyu,Kim, Joo-Hyung Elsevier 2017 Materials letters Vol.196 No.-
<P><B>Abstract</B></P> <P>Nanostructured manganese dioxide decorated multi-walled carbon nanotube (MnO<SUB>2</SUB>/MWNT) composite was prepared by a hydrothermal method using a 3D precursor manganese benzoate dihydrazinate. Microscopic analysis confirmed that the nanostructured MnO<SUB>2</SUB> particles were densely decorated over the MWNT surface. The composite showed high specific capacitance (276F·g<SUP>−1</SUP> at a current density of 3.0A·g<SUP>−1</SUP>) and an excellent cycle stability (91.6% capacitance retention after 5000 cycles), suggesting its potential application for a high-performance supercapacitor.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile synthesis of nanostructured MnO<SUB>2</SUB>/MWNT composite. </LI> <LI> 3D coordination complex as a precursor. </LI> <LI> Composite showed higher capacitance of 276F·g<SUP>−1</SUP>. </LI> <LI> Excellent cyclic stability and reversibility. </LI> </UL> </P>
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.