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RISS 인기검색어
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- 저자 : G. Edison (검색결과 4 건)
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Edison Arango-Gómez,Javier Laureano Nino-Barrera,Gustavo Nino,Freddy Jordan,Henry Sossa-Rojas 대한치과보존학회 2019 Restorative Dentistry & Endodontics Vol.44 No.4
Pulp revascularization is an alternative treatment in immature traumatized teeth with necrotic pulp. However, this procedure has not been reported in horizontal root fractures. This is a case report of a 9-year-old patient with multiple horizontal root fractures in 2 upper central incisors that were successfully treated with pulp revascularization. The patient presented for treatment 2 years after the initial trauma, and revascularization was attempted after the initial treatment with calcium hydroxide had failed. Prior to pulp revascularization, cone-beam computed tomography and autoradiograms demonstrated multiple horizontal fractures in the middle and apical thirds of the roots of the 2 affected teeth. Revascularization was performed in both teeth; platelet-rich plasma (PRP) was used in one tooth (#11) and the conventional method (blood clot) was used in the other tooth (#21). Clinical and radiographic follow-up over 4 years demonstrated pulp calcification in the PRP-treated tooth. Neither of the 2 teeth were lost, and the root canal calcification of tooth #11 was greater than that of tooth #21. This case suggests that PRP-based pulp revascularization may be an alternative for horizontal root fractures.
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Edison, T.N.J.I.,Atchudan, R.,Sethuraman, M.G.,Lee, Y.R. Elsevier BV ; C/o Dept. of Chemical Engineering, N 2016 JOURNAL- TAIWAN INSTITUTE OF CHEMICAL ENGINEERS Vol.68 No.-
Carbon supported cobalt oxide nanoparticles (Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs) were synthesized by simple thermolysis of cobalt(II) acetate tetrahydrate and Terminalia chebula (T. chebula) fruit. The synthesized Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs were characterized using attenuated total reflection conjunction with Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) techniques. The specific surface area of Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs was measured by N<SUB>2</SUB> adsorption-desorption isotherm. The ATR-FTIR analysis revealed that the phytoconstituents of T. chebula were carbonized and supports the Co<SUB>3</SUB>O<SUB>4</SUB> NPs. The synthesized Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs were highly crystalline with carbon support, exposed by the XRD patterns. As inferred from microscopic images, the particle size of Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs is in the range of 15-25nm with distorted spherical shape. The EDS results confirmed the presence of three major elements such as Co, O and C in the synthesized Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs. The calculated specific surface area of Co<SUB>3</SUB>O<SUB>4</SUB> NPs is 22m<SUP>2</SUP>/g. The supercapacitor performance of synthesized Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs in 2M aqueous KOH was analyzed by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) methods. The Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs showed a maximum specific capacitance of about 642F/g at 1 A/g of discharging current density between 0 and 0.50V (vs. Ag/AgCl). The high specific capacitance of Co<SUB>3</SUB>O<SUB>4</SUB>Γ NPs could be attributed to the combination of both double layer capacitance and pseudocapacitance.
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Edison, T. N.,Sethuraman, M. G.,Lee, Y. R. Springer Science + Business Media 2016 Research on chemical intermediates Vol.42 No.2
<P>This study deals with reduction of ortho and para-nitroaniline by NaBH4 with silver nanoparticles (AgNPs), synthesized by use of a green method, as catalyst. In the synthesis of the AgNPs an aqueous extract of Tamarindus indica (T. indica) seed coat was used as a reducing and capping agent. The effects of extract concentration and reaction time on formation of the AgNPs were studied by use of UV-visible (UV-Vis) spectroscopy. The stable AgNPs were characterized by dynamic light scattering (DLS), measurement of zeta potential, Fourier-transform infrared (FTIR) spectroscopy, and high-resolution transmission electron microscopy (HRTEM) with energy-dispersive spectrum analysis. Appearance of a yellow color and generation of a surface plasmon resonance peak in UV-Vis spectroscopy confirmed formation of the AgNPs. The FTIR results suggested that the phytoconstituents of T. indica seed coat extract are responsible for reduction of the Ag+ and protection of the AgNPs. HRTEM studies showed the size of the AgNPs was approximately 30-50 nm; their shape was distorted spherical. The TEM results were consistent with DLS study. The catalytic efficacy of stable AgNPs in the reduction of o and p-nitroaniline was studied by UV-Vis spectroscopy. The calculated rate constants (k) for catalytic reduction of o and p-nitroaniline by AgNPs were 2.43 x 10(-3) and 6.22 x 10(-3) S-1.</P>
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K. John Samuel,R. Thundil Karuppa Raj,G. Edison 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.4
The performance of the refrigeration system mainly depends on the hermetic compressor. Of different compressors used in the refrigeration and air conditioning industries, hermetic reciprocating compressors are still efficient and have its place in domestic applications. This paper presents a review of most critical parameters and their influence on the hermetic reciprocating compressor performance. A detailed study is done on parameters like backflow, effective force and flow areas, valve dynamic behavior, etc. This study mainly concentrated on compressor valves which influence the performance of the hermetic compressor to a much greater extent. Finally, the study reveals that these parameters are playing a vital role in influencing the performance of the refrigeration system. Advanced numerical techniques involving combining fluid flow and structural analysis involving Fluid Structure Interaction (FSI) may give a better insight of the flow physics happening inside the compressors and the effect of fluid force on valve fluttering, back pressure and dynamics characteristics can be revealed in depth to optimize the performance of the hermetic compressor for household applications involving air conditioners, refrigerators, water coolers, chillers, etc.
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