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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 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, 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, 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>
Compatibility of Lithium ion Phosphate Battery in Solar off Grid Application
Lakshmanan, Sathishkumar,Vetrivel, Dhanapal,Subban, Ravi,R., Saratha,Nanjan, Sugumaran The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.4
Solar energy harvesting is practiced by various nations for the purpose of energy security and environment preservation in order to reduce overdependence on oil. Converting solar energy into electrical energy through Photovoltaic (PV) module can take place either in on-grid or off-grid applications. In recent time Lithium battery is exhibiting its presence in on-grid applications but its role in off-grid application is rarely discussed in the literature. The preliminary capacity and Peukert's study indicated that the battery quality is good and can be subjected for life cycle test. The capacity of the battery was 10.82 Ah at 1 A discharge current and the slope of 1.0117 in the Peukert's study indicated the reaction is very fast and independent on rate of discharge. In this study Lithium Iron Phosphate battery (LFP) after initial characterization was subjected to life cycle test which is specific to solar off-grid application as defined in IEC standard. The battery has delivered just 6 endurance units at room temperature before its capacity reached 75% of rated value. The low life of LFP battery in off-grid application is discussed based on State of Charge (SOC) operating window. The battery was operated both in high and low SOC's in off-grid application and both are detrimental to life of lithium battery. High SOC operation resulted in cell-to-cell variation and low SOC operation resulted in lithium plating on negative electrode. It is suggested that to make it more suitable for off-grid applications the battery by default has to be overdesigned by nearly 40% of its rated capacity.