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Lakshmanan, Pandian,Kim, Dong Ha,Park, Eun Duck American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>We examined the effect of the particle size of gold on steam reforming of methanol over Au/CeO2-ZrO2 catalysts. Gold was loaded onto CeO2-ZrO2 through deposition-precipitation. The average particle size (2-12 nm) of the gold was controlled by thermal reduction under H-2 at various temperatures and by chemical reduction with various reducing agents. The catalytic activity decreased significantly with increasing particle size of the gold. The turnover frequency at the interface between gold and a support appeared to be independent of particle size in the range 2-5 nm, which implies that the perimeter of the particle may be the active site for this reaction. Methanol adsorption and conversion over these catalysts were also investigated with in-situ diffuse reflectance infrared Fourier transform spectroscopy. Analytical results for various adsorbed intermediate species during methanol conversion suggests that transformation of methoxy species is facilitated by use of smaller gold particles.</P>
Lakshmanan Vennila,Kodukkur Viswanathan Pugalendi 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.8
Myocardial infarction is the leading cause of death all over the world. Sesamol is a potent phenolic antioxidant contained only in processed sesame oil and possesses potent chemopreventive, antimutagenic, antihepatotoxic and antioxidation properties. This study was undertaken to investigate the effect of sesamol on plasma and tissue lipid profiles in isoproterenol (ISO) -induced rats. Myocardial infarction was induced in adult male albino rats of the Wistar strain, weighing 180-200 g, by administration of isoproterenol (85 mg/kg of body weight), subcutaneously for 2 consecutive days. Sesamol dissolved in saline (0.9% NaCl) was administered intraperitoneally once in a day in the morning for 7 days. Increased levels of total cholesterol,phospholipids, triglycerides and free fatty acids in the plasma and the decreased levels of phospholipids in tissues were observed in ISO-induced rats. Very low density lipoprotein cholesterol (VLDL-C) and low density lipoprotein cholesterol (LDL-C) increased while high density lipoprotein cholesterol (HDL-C) decreased in the plasma of ISO-induced rats. Administration of sesamol (50, 100 and 200 mg/kg of body weight) improved the above changes and brought towards normal level. The protective role of sesamol against isoproterenol-induced myocardial infarction was further confirmed by histopathological examination. These results suggest that sesamol has antihyperlipidaemic effect against cardiotoxicity.
Lakshmanan, N.,Raghuprasad, B.K.,Gopalakrishnan, N.,Sreekala, R.,Rama Rao, G.V. Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.35 No.6
The paper proposes two methodologies for damage identification from measured natural frequencies of a contiguously damaged reinforced concrete beam, idealised with distributed damage model. The first method identifies damage from Iso-Eigen-Value-Change contours, plotted between pairs of different frequencies. The performance of the method is checked for a wide variation of damage positions and extents. The method is also extended to a discrete structure in the form of a five-storied shear building and the simplicity of the method is demonstrated. The second method is through smeared damage model, where the damage is assumed constant for different segments of the beam and the lengths and centres of these segments are the known inputs. First-order perturbation method is used to derive the relevant expressions. Both these methods are based on distributed damage models and have been checked with experimental program on simply supported reinforced concrete beams, subjected to different stages of symmetric and un-symmetric damages. The results of the experiments are encouraging and show that both the methods can be adopted together in a damage identification scenario.
Lakshmanan, Arunachalam,Kim, Seon-Bae,Kum, Byung Gon,Jang, Hyun Myung,Kang, Bong Koo WILEY-VCH Verlag 2006 Physica status solidi. PSS. A, Applications and ma Vol.203 No.3
<P>New Recipes for rare earth doped CaSO<SUB>4</SUB> luminescence phosphors which give high photoluminescence efficiency combined with high thermal stability desired for noval display applications are described. The influence of cooling rate, thermal treatments and water washing as well as crystal size and morphology on the luminescence efficiency are described. While a modified co-precipitation technique was found best suited for preparing thermostimulated luminescence phosphors required for radiation dosimetry, those made by solid state diffusion reactions at high temperatures were found best suited to achieve the high photoluminescence efficiency required for lighting and display applications. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)</P>
Lakshmanan, A. R.,Kim, S.-B.,Jang, H. M.,Kum, B. G.,Kang, B. K.,Heo, S.,Seo, D. WILEY-VCH Verlag 2007 Advanced Functional Materials Vol.17 No.2
<P>Wide-bandgap materials doped with rare-earth ions are currently of great interest as new vacuum ultraviolet (VUV) phosphors for lighting and displays. This paper reports the development of a highly sensitive green phosphor, CaSO<SUB>4</SUB>:Tb,Na, which exhibits a quantum efficiency higher than 100 % by exploiting the energy-transfer mechanism from anion excitons to the activator ions, Tb<SUP>3+</SUP>. The VUV excitation spectra of CaSO<SUB>4</SUB>:Tb<SUP>3+</SUP> with Na<SUP>+</SUP> as a charge compensator show two prominent excitation bands at 147 and 216 nm. The former band is attributed to the charge-transfer excitations within SO<SUB>4</SUB><SUP>2–</SUP> complexes while the latter was assigned to the 4f<SUP>8</SUP> → 4f<SUP>7</SUP>5d transitions on Tb<SUP>3+</SUP>. The energy-transfer mechanism from anion excitons to Tb<SUP>3+</SUP> strongly raises the possibility of two-photon emission via a second-order down-conversion under the VUV excitation, which is basically a new approach in the goal of achieving a quantum-splitting phosphor.</P> <B>Graphic Abstract</B> <P>The vacuum ultraviolet (VUV) excitation (left) and emission spectra (right) of a CaSO4:Tb phosphor (red lines) are compared with those of the standard commercial green plasma display panel (PDP) phosphor YBO<SUB>3</SUB>:Tb (black lines). The intense green emission line at 545 nm corresponds to <SUP>5</SUP>D<SUB>4</SUB>→<SUP>7</SUP>F<SUB>5</SUB> electronic transition. The quantum efficiency of CaSO<SUB>4</SUB>:Tb under VUV excitation at 147 nm is estimated to be higher than 100 %. <img src='wiley_img/1616301X-2007-17-2-ADFM200600010-content.gif' alt='wiley_img/1616301X-2007-17-2-ADFM200600010-content'> </P>
Lakshmanan, Meiyappan,Zhang, Zhaoyang,Mohanty, Bijayalaxmi,Kwon, Jun-Young,Choi, Hong-Yeol,Nam, Hyung-Jin,Kim, Dong-Il,Lee, Dong-Yup American Society of Plant Biologists 2013 PLANT PHYSIOLOGY - Vol.162 No.4
<P><I>A metabolic/regulatory network of rice incorporates two important tissue types, germinating seeds and photorespiring leaves, is validated through experiments with rice suspension cultures, and applied to analyze metabolic capability under flooding and drought conditions.</I></P>
Lakshmanan, P.,Park, J.E.,Kim, B.,Park, E.D. Elsevier Science Publishers 2016 CATALYSIS TODAY - Vol.265 No.-
<P>The preferential oxidation of CO (CO-PROX) under excess hydrogen over Au/MOx/Al2O3 (M = La, Ce, and Mg) catalysts was investigated. All catalysts were prepared by a deposition-precipitation method with urea and characterized with inductively coupled plasma-atomic emission spectroscopy, N-2 physisorption, temperature-programmed reduction, X-ray diffraction, transmission electron microscopy, in-situ diffuse reflectance infrared Fourier transform spectroscopy, and X-ray photoelectron spectroscopy. The catalytic activity of the supported gold catalysts was found to be dependent on the promoter, and decreased in the order: Au/La2O3/Al2O3 > Au/CeO2/Al2O3 > Au/MgO/Al2O3 > Au/Al2O3. The catalytic activity of the Au/La2O3/Al2O3 catalyst depended on the pretreatment conditions, i.e., reduction with aqueous NaBH4, thermal reduction with H-2, and calcination with O-2. This indicates that the oxidation state of gold is an important factor in the activity of the catalyst, and that metallic gold is more suitable than its oxidized form for this reaction. XPS results revealed that the treatment with aqueous NaBH4 resulted in more negative charge in gold particles than that of conventional thermal reduction under H-2. Smaller gold particles appeared to be favorable for the low-temperature CO-PROX activity of the Au/La2O3/Al2O3 catalysts, which showed stable CO-PROX performance, even in the presence of CO2. (C) 2015 Elsevier B.V. All rights reserved.</P>