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Phytochemical Studies of Phyllanthus debilis
K.S.Chandrashekar,D.Satyanarayana,A.B.Joshi,E.V.S.Subrahmanyam 한국생약학회 2004 Natural Product Sciences Vol.10 No.3
Two Lignans Phyllanthin and Hypophyllanthin, and a steroid b-sitosterol has been isolated from the leaves of Phyllanthus debilis and their structures were established by spectral analysis and direct comparison with authentic samples. This is the first report of occurrence of these compound from P.debilis.
Supersonically sprayed thermal barrier layers using clay micro-particles
Kim, D.Y.,Lee, J.G.,Joshi, B.,Lee, J.H.,Al-Deyab, S.S.,Yoon, H.G.,Yang, D.R.,Yarin, A.,Yoon, S.S. Elsevier 2016 Applied clay science Vol.120 No.-
<P>Several clay minerals were supersonically sprayed onto flexible substrates to form highly thermally and electrically insulating materials which could be wrapped onto protected surfaces. Among these clay minerals, montmorillonite (Mt) revealed the best thermal insulating properties. (C) 2015 Elsevier B.V. All rights reserved.</P>
Electrosprayed graphene decorated with ZnO nanoparticles for supercapacitors
Samuel, Edmund,Londhe, Priyanka U.,Joshi, Bhavana,Kim, Min-Woo,Kim, Karam,Swihart, Mark T.,Chaure, Nandu B.,Yoon, Sam S. Elsevier 2018 Journal of alloys and compounds Vol.741 No.-
<P><B>Abstract</B></P> <P>A binder-free nanocomposite consisting of ZnO nanoparticles (NPs) grown directly on graphene sheets by electrospraying was fabricated for use as an electrode material in supercapacitors. The optimal concentrations of graphene and ZnO NPs were determined from the capacitive characteristics of the composite. Scanning electron microscopy confirmed that the ZnO NPs grew in a uniformly distributed manner on the graphene sheets and that they exhibited negligible agglomeration. Further, X-ray diffraction analysis confirmed that ZnO growth was preferentially oriented along (100) plane in the ZnO/graphene composite. A symmetric supercapacitor fabricated using this composite exhibited an energy density of 67 mWh·cm<SUP>−3</SUP> and power density of 6000 mW·cm<SUP>−3</SUP>. The composite also showed good long-term cycling performance, retaining 90% of its capacitance after 1000 galvanostatic charge/discharge cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ZnO/graphene electrodes for supercapacitor applications have been fabricated using electrospraying. </LI> <LI> A symmetric supercapacitor exhibited an energy density of 67 mWh·cm-3 and power density of 6000 mW·cm<SUP>−3</SUP>. </LI> <LI> The composite retained 90% of its capacitance after 1000 galvanostatic charge and discharge cycles. </LI> <LI> The graphene sheets prevented agglomeration of the ZnO nanoparticles. </LI> </UL> </P>
Joshi, B.,Gyawali, G.,Wang, H.,Sekino, T.,Lee, S.W. Elsevier Sequoia 2013 Journal of alloys and compounds Vol.557 No.-
Different Sialon phases, intergranular phase and sinterbility of additives play an important role on thermal, mechanical and optical properties of Sialon ceramics. Hot pressed translucent Mg-α/β-Sialon composite was fabricated with MgO as a sintering additive. But with MgO, complete densification was not achieved because of its higher viscosity and higher melting point. Y<SUB>2</SUB>O<SUB>3</SUB> is one of the best sintering additives to achieve complete densification and good mechanical properties in silicon nitride based ceramics. Therefore, different amount of Y<SUB>2</SUB>O<SUB>3</SUB> was added to Mg-α/β-Sialon composite and effect of Y<SUB>2</SUB>O<SUB>3</SUB> addition on microstructure, thermal, mechanical and optical properties was investigated. α-Sialon phase was increased with increasing the amount of Y<SUB>2</SUB>O<SUB>3</SUB> up to 1wt.%, but addition of 2wt.% Y<SUB>2</SUB>O<SUB>3</SUB>, most β-Sialon phase was observed. Thermal conductivity and coefficient of thermal expansion values were increased with increasing the amount of Y<SUB>2</SUB>O<SUB>3</SUB>. However, translucency was decreased in higher Y<SUB>2</SUB>O<SUB>3</SUB> addition.
A.B.Joshi,D.Satyanarayana,K.S.Chandrashekar,E.V.S.Subrahmanyam 한국생약학회 2004 Natural Product Sciences Vol.10 No.3
From the flowers of Ervatamia coronaria four indole alkaloids have been isolated and characterized as harmine, heyneanine, voacristine and apparicine with the help of various spectral data. The alkaloids Harmine and Heyneanine are reported first time from the flowers of Ervatamia coronaria.
Nonlinear thermoelastic response of laminated composite conical panels
Joshi, R.M.,Patel, B.P. Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.1
Nonlinear thermoelastic static response characteristics of laminated composite conical panels are studied employing finite element approach based on first-order shear deformation theory and field consistency principle. The nonlinear governing equations, considering moderately large deformation, are solved using Newton-Raphson iterative technique coupled with the adaptive displacement control method to efficiently trace the equilibrium path. The validation of the formulation for mechanical and thermal loading cases is carried out. The present results are found to be in good agreement with those available in the literature. The adaptive displacement control method is found to be capable of handling problems with multiple snapping responses. Detailed parametric study is carried out to highlight the influence of semicone angle, boundary conditions, radius-to-thickness ratio and lamination scheme on the nonlinear thremoelastic response of laminated cylindrical and conical panels.
Nonlinear thermoelastic response of laminated composite conical panels
B.P. Patel,R.M. Joshi 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.1
Nonlinear thermoelastic static response characteristics of laminated composite conical panels are studied employing finite element approach based on first-order shear deformation theory and field consistency principle. The nonlinear governing equations, considering moderately large deformation, are solved using Newton-Raphson iterative technique coupled with the adaptive displacement control method to efficiently trace the equilibrium path. The validation of the formulation for mechanical and thermal loading cases is carried out. The present results are found to be in good agreement with those available in the literature. The adaptive displacement control method is found to be capable of handling problems with multiple snapping responses. Detailed parametric study is carried out to highlight the influence of semicone angle, boundary conditions, radius-to-thickness ratio and lamination scheme on the nonlinear thremoelastic response of laminated cylindrical and conical panels.
Studies on Composite Filaments from Nanoclay Reinforced Polypropylene
Joshi, Mangala,Shaw, M.,Butola, B.S. The Korean Fiber Society 2004 Fibers and polymers Vol.5 No.1
The development of high tenacity, high modulus monofilaments from Polypropylene/Clay nanocomposite has been investigated. Pure sodium montmorillonite nanoclay was modified using hexadecyl trimethyl ammonium bromide (HTAB) via an ion exchange reaction. Pure and modified clay were characterized through X-ray diffraction, FTIR and TGA. The modified clay was melt blended with polypropylene (PP) in presence of a swelling agent. Composite filaments from PP/Clay nanocomposite were prepared at different weight percentages of nanoclay and the spinning and drawing conditions were optimized. The filaments were characterized for their mechanical, morphological and thermal properties. The composite PP filaments with modified clay showed improved tensile strength, modulus and reduced elongation at break. The composite filaments with unmodified clay did not show any improvement in tensile strength but the modulus improved. The sharp and narrow X-ray diffraction peaks of PP/nanoclay composite filaments indicate increase in crystallinity in presence of modified clay at small loadings (0.5 %). The improved thermal stability was observed in filaments with modified as well as unmodified clays.