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S. Md. AKBAR,S. K. JAYALAKSHMI,H. C. SHARMA,K. SREERAMULU 한국곤충학회 2011 Entomological Research Vol.41 No.6
Dihydrolipoamide dehydrogenase (DHLDH) was isolated from the mitochondria of Helicoverpa armigera, a destructive pest which has developed resistance to commonly used insecticides. The flavoenzyme was purified 17.98-fold to homogeneity with an overall yield of 10.53% by employing ammonium sulfate precipitation, hydroxylapatite chromatography and CM-Sephadex chromatography. The purified enzyme exhibited the specific activity of 18.7 U/mg and was characterized as a dimer with a subunit mass of 66 kDa. The enzyme showed specificity for nicotinamide adenine dinucleotide – hydrogen (NADH) and lipoamide, as substrates, with Michaelis-Menten constants (K_m) of 0.083 mmol/L and 0.4 mmol/L, respectively. The reduction reaction of lipoamide by the enzyme could be explained by ping-pong mechanism. The spectra of DHLDH showed the maximum absorbance at 420 nm, 455 nm and 475 nm. The enzyme activity was strongly inhibited by mercurial and arsenical compounds. The N-terminal sequence of Ha-DHLDH showed homology with those of mammalian and arthropod DHLDH. Since H. armigera has developed high levels of resistance to commonly used insecticides, biochemical properties of the metabolic enzymes such as DHLDH, could be helpful to develop insecticidal molecules for the control of H. armigera, with a different mode of action.
Studies on hydrogen embrittlement in Zr- and Ni-based amorphous alloys
Jayalakshmi, S.,Park, S.O.,Kim, K.B.,Fleury, E.,Kim, D.H. Elsevier 2007 Materials science & engineering. properties, micro Vol.449 No.-
<P><B>Abstract</B></P><P>Mechanical and structural properties of Zr<SUB>50</SUB>Ni<SUB>27</SUB>Ni<SUB>18</SUB>Co<SUB>5</SUB> (at.%) and Ni<SUB>59</SUB>Zr<SUB>16</SUB>Ti<SUB>13</SUB>Nb<SUB>7</SUB>Sn<SUB>3</SUB>Si<SUB>2</SUB> (at.%) amorphous alloys were studied before and after hydrogenation. In both alloys, upon hydrogenation, a significant reduction in mechanical properties was evident. The occurrence of hydrogen embrittlement was supported by fracture morphology and is further explained based on the corresponding structural changes induced by hydrogenation.</P>
Vyas, Chirag K.,Brahmmananda Rao, C. V. S.,Jayalakshmi, S.,Joshirao, Pranav M.,Manchanda, Vijay K. Walter de Gruyter GmbH 2015 RADIOCHIMICA ACTA Vol.103 No.4
<B>Abstract</B><P>The present work investigates the role of increase in the basicity of organophosphorus extractant (dialkylalkyl phosphonates) on the uptake of actinides and fission products vis-à-vis tributyl phosphate (TBP), currently employed as a universal extractant. Two dialkylalkyl phosphonates viz. dibutylpropyl phosphonate (DBPrP) and dibutylpentyl phosphonate (DBPeP) were synthesized, characterized and evaluated for their solvent extraction behavior towards U(VI), Th(IV), Eu(III) and Tc(VII) in nitric acid medium ranging from 0.01–6 M. It was observed that increasing the basicity of the phosphoryl oxygen enhanced the uptake of the actinides and the distribution coefficient values were significantly larger as compared to TBP. The limiting organic concentration (LOC) value was estimated for Th(IV) for these extractants and compared with the TBP system. The separation factors of actinides with phosphonates over Tc(VII) are distinctly better than that with TBP.</P>
N. S. Jayalakshmi,K. M. Bhargavi 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
This paper presents a plug-in electric vehicle (PEV) charging unit supplied by PV, wind and the battery in an autonomous mode of DC microgrid (MG) system. With the traditional control methods of PEV, the EV is charged without considering generation and the load limits. The control strategy proposed for PEV in this article is to increase the maximum rate of charging capacity of an EV only if generation exceeds the load demand using new current-loop control technique. The variation of photovoltaic irradiance, DC and AC loads, battery charging and discharging characteristics are considered which are directly coupled to a medium voltage DC bus. This tends to be an attractive option for increasing the efficiency and operation of electric vehicle charging station. The power reference based droop controller is designed for the battery to provide an efficient power management of a DC MG system by regulating the DC link voltage with less deviation. The effectiveness of the proposed MG system with Escape Ford EV vehicle has been validated by MATLAB/Simulink. The reported simulation results show that the approach presented is capable of governing the PEV charging unit and regulation of DC bus voltage.
Vishnu G. Nair,Adarsh Rag S.,Jayalakshmi K. P.,Dileep M. V.,K. R. Guruprasad 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.7
In this paper, a dynamic workspace allocation methodology for coverage path planning using multiple robots in the presence of obstacles is presented. The entire workspace is initially partitioned using the Manhattan Voronoi partitioning method, without considering the obstacles present, and the robots execute Multi-Robot Simultaneous Exploration and Coverage (MRSimExCoverage) using the Spanning Tree Coverage (STC) algorithm and cover the workspace. A dynamic workspace re-allocation strategy to optimize the area covered by each robot, whenever obstacles are detected, so as to avoid certain obstacle-induced coverage issues is studied. Simulation experiments within the Matlab/V-rep environment are used to demonstrate and validate the performance of the proposed algorithm. Though the authors used the STC algorithm for path planning for demonstration, any suitable coverage algorithm may be used.