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High Speed Network Intrusion Detection System(NIDS)Using Low power precomputation Based Content Addressable Memory

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Computers, Materials & Continua 2020年第3期62卷 1097-1107页

作者： r.Mythili p.Kalpana KIT-Kalaignarkarunanidhi Institute of Technology Coimbatore-641402TamilnaduIndia pSG College of Technology Coimbatore-641004TamilnaduIndia

NIDS(Network Intrusion Detection Systems)plays a vital role in security threats to computers and *** the onset of gigabit networks,hardware-based Intrusion Detection System gains popularity because of its high performance when compared to the software-based *** software-based system limits parallel execution,which in turn confines the performance of a modern *** paper presents a signature-based lookup technique using reconfigurable *** Addressable Memory(CAM)is used as a lookup table architecture to improve the speed instead of search *** minimize the power and to increase the speed,pre-computation based CAM(pBCAM)can be used,as this technique avoids repeated search *** employs the two-stage comparison with a parameter memory in the first stage and data memory in the second *** the matched data in the parameter memory are compared in the data *** reduces the number of comparisons,thereby increasing the speed of the *** this work dual-port rAM-based pBCAM(Dp-pBCAM)is used to design a signature-based intrusion detection system.A low power parameter extractor is used with a minimum number of gates for *** hardware implementation is done using Xilinx Spartan 3E *** proposed Dp-pBCAM lookups support a gigabit-speed of 7.42 Gbps.

关键词： NIDS FpGA dual port rAM CAM pBCAM Dp-pBCAM

High-temperature thermodynamics of silver:Semi-empirical approach

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Chinese physics B 2017年第11期26卷 400-407页

作者： r H Joshi B Y Thakore p r Vyas A r Jani N K Bhatt Department of physics Sardar Patel University Department of physics School of Sciences Gujarat University Sardar patel Center for Science and Technology Department of physics M.K.Bhavnagar University

We report high-temperature thermodynamics for fcc silver by combining ab initio phonon dynamics to empirical quadratic temperature-dependent term for anharmonic part of Helmholtz free energy. The electronic free energy is added through an interpolation scheme, which connects ambient condition free electron gas model to Thomas-Fermi *** present study shows good agreement with experimental and reported findings for several thermal properties, and the discrepancy observed in some caloric properties is addressed. The decreases in the product of volume thermal expansion coefficient and isothermal bulk modulus and in the constant volume anharmonic lattice specific heat at high temperature are the clear evidences of proper account of anharmonicity. The present study also reveals that T-2-dependent anharmonic free energy is sufficient for correct evaluation of thermal pressure and conventional Grüneisen parameter. We observe that the intrinsic phonon anharmonicity starts dominating above characteristic temperature, which is attributed to higher order anharmonicity and can be related to higher order potential derivatives. We conclude that the uncorrelated and largeamplitude lattice vibrations at high temperature raise dominating intrinsic thermal stress mechanism, which surpasses the phonon-anharmonism and requires future consideration.

关键词： thermodynamics anharmonicity Grüneisen parameter silver

Band-gap engineering of La1-xNdxAlO3(x = 0,0.25,0.50,0.75,1)perovskite using density functional theory：A modified Becke Johnson potential study

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Chinese physics B 2016年第6期25卷 376-382页

作者： Sandeep D p rai A Shankar M p Ghimire Anup pradhan Sakhya T p Sinha r Khenata S Bin Omran r K Thapa Department of physics Mizoram University Aizawl-796004 India Department of physics Pachhunga University College Aizawl-796001 India Department of physics University of North Bengal Darjeeling-734013 India IFW Dresden e. V. P. O. Box 270116 D-01171 Dresden Germany Department of physics Bose Institute 93/1 Acharya Prafulla Chandra Road Kolkata 700009 India Laboratoire de physique Quantique et de Modelisation Mathematique (LpQ3M) Department de Technologie Universite de Mascara 29000 Mascara Algerie Algeria Department of physics and Astronomy College of Science King Saud University P. O: Box 2455 Riyadh 11451 Saudi Arabia

The structural,electronic,and magnetic properties of the Nd-doped rare earth aluminate,La1-xNdxAlO3（x = 0%to 100%） alloys are studied using the full potential linearized augmented plane wave（Fp-LApW） method within the density functional *** effects of the Nd substitution in La AlO3 are studied using the supercell *** computed electronic structure with the modified Becke–Johnson（m BJ） potential based approximation indicates that the La1-xNdxAlO3 alloys may possess half-metallic（HM） behaviors when doped with Nd of a finite density of states at the Fermi level（EF）.The direct and indirect band gaps are studied each as a function of x which is the concentration of Nddoped La *** calculated magnetic moments in the La1-xNdxAlO3 alloys are found to arise mainly from the Nd-4f state.A probable half-metallic nature is suggested for each of these systems with supportive integral magnetic moments and highly spin-polarized electronic structures in these doped systems at *** observed decrease of the band gap with the increase in the concentration of Nd doping in La AlO3 is a suitable technique for harnessing useful spintronic and magnetic devices.

关键词： density functional theory rare earth aluminates perovskites electronic structures

Optical absorption of Tl^+ ions in KBr_(1-x)I_x:TlI mixed crystals

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Nuclear Science and Techniques 2009年第4期20卷 208-218页

作者： Eswaran p ravisankar r Nagarajan S Department of physics SMK Fomra Institute of Technology Department of physics Government Arts CollegeThiruvannamalai Department of physics Pondicherry Engineering College

Optical absorption spectra of the mixed crystals of KBr1-xIx:Tl+ crystals studied at room temperature are *** absorption spectra indicated the appearance of additional bands on the low energy side of the Characteristic A,B and C absorption bands of KBr:Tl+ single crystals with increasing iodine *** with earlier reports,the additional bands were attributed to the complex Tl+centers in the mixed configuration surrounded by Br-and I-ions as nearest *** absorption spectra of gamma irradiated mixed crystals showed F band,which shifts towards low energy side with the composition of iodine ions in the mixed crystals.

关键词：能级核技术光谱吸收碘离子

pH-metric and thermodynamic studies of rare earth metal chelates

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Journal of rare Earths 2009年第3期27卷 457-460页

作者： Alok Vyas r. p. Mathur The Werner Lab Department of ChemistryDungar College

proton ligand stability constants of hydroxybenzoic acid containing nitro group （2-Hydroxy-4-nitrobenzoic acid and 3-Hydroxy-4- nitrobenzoic acid） were determined through lrving-rossoti pH titration technique. The stability constants of rare earth metal chelates containing 2-Hydroxy-4-nitrobenzoic acid and 3-Hydroxy-4-nitrobenzoic acid as ligands were studied in aqueous medium at different ionic strength （p=0.01, 0.05 and 0.1 mol/L） and temperatures （298, 308 and 318± 0.1 K）. The values of stability constant were evaluated through different computational methods like successive approximation, least square treatment, correction term method, and convergence method. The observed value of thermodynamic parameters （△G°, △H° and △S°） favors the complex formation between metal and ligands. The order of stabifity constant was found to be pr（III）〈Nd（III）〈Sm（III）〈Tb（III）〈Ho（III）〈Er（III） as reported by Stagg and powell.

关键词： hydroxy nitrobenzoic acid rare earth metal chelates Irving-rossoti method

response of photonic Hydrogels of Homogeneous particles to Uranyl Ions in Aqueous Solutions

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photonic Sensors 2023年第4期13卷 50-61页

作者： r.G.JOSHI Deepak K.GUpTA p.AMESH p.K.pArIDA T.r.rAVINDrAN Materials Science Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India Materials Chemistry and Metal Fuel Cycle Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National InstituteKalpakkam 603102India Metallurgy and Materials Group Indira Gandhi Centre for Atomic ResearchA CI of Homi Bhabha National Institute(HBNI)Kalpakkam 603102India

We study here the response of photonic hydrogels(pHs),made of photonic crystals of homogeneous silica particles in polyacrylamide hydrogels(SpHs),to the uranyl ions 22 UO_(2)^(2+) in aqueous *** is found that the reflection spectra of the SpH show a peak due to the Bragg diffraction,which exhibits a blue shift in the presence of 22 UO_(2)^(2+).Upon exposure to the SpH,22 UO_(2)^(2+)gets adsorbed on the SpH and forms complex coordinate bonds with multiple ligands on the SpH,which causes shrinking of hydrogel and leads to the blue shift in the diffraction *** amount of the blue shift in the diffraction peak increases monotonically up to 22 UO_(2)^(2+)concentrations as high as 2300μ*** equilibration time for the shift in the Bragg peak upon exposure to 22 UO_(2)^(2+)is found to be~30 *** results are in contrast to the earlier reports on photonic hydrogels of inhomogeneous microgel particles hydrogel(MpH),which shows the threshold 22 UO_(2)^(2+)concentration of~600μM,below which the diffraction peak exhibits a blue shift and a change to a red shift above *** equilibration time for MpH is~300 *** observed monotonic blue shift and the faster time response of the SpH to 22 UO_(2)^(2+)as compared to the MpH are explained in terms of homogeneous nature of silica particles in the SpH,against the porous and polymeric nature of microgels in the *** also study the extraction of 22 UO_(2)^(2+)from aqueous solutions using the *** extraction capacity estimated by the arsenazo-III analysis is found to be 112 mM/kg.

关键词： photonic hydrogels uranium extraction and monitoring arsenazo-Ⅲ-uranium complex polyacrylamide hydrogel UV-visible spectroscopy

Fracture Toughness and Microcracks on Natural Apophyllite Crystals

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Journal of Materials Science & Technology 1998年第2期14卷 156-160页

作者： Dhar, p.r. Bamzai, K. Kotru, p.N. Dept. of physics University of Jammu Jammu-180004 India

results on fracture toughness of natural apophyllite crystals when they were subjected to impact were presented. The morphology of the cracks and fracture has been studied. It was found that the crack formation does not show any anisotropic property and remains the same whatever may be the orientation of the crystal. The average values of the fracture toughness K//c and brittleness index, as determined from measurements of crack length, were estimated to be 0.107 g mu m** minus **3**/**2 and 4.19 mu m** minus **1**/**2 respectively for the a(100) plane. The yield strength for a(100), p(111) and C(001) planes of apophyllite crystals for lower loads is 2250, 2160 and 1840 Mpa and for higher loads is 1510, 1600 and 1430 Mpa respectively. (Edited author abstract) 7 refs.

关键词： Crystals

reliable energy-efficient routing with novel route update in wireless sensor networks

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Journal of Zhejiang University-Science A(Applied physics & Engineering) 2008年第8期9卷 1099-1110页

作者： r. VIDHYAprIYA p. T. VANATHI Department of Information Technology PSG College of TechnologyCoimbatore 641004 India Department of Electronics and Communication Engineering PSG College of TechnologyCoimbatore 641004 India

In this paper we introduce a novel energy-aware routing protocol rEpU (reliable, efficient with path update), which provides reliability and energy efficiency in data delivery. rEpU utilizes the residual energy available in the nodes and the re-ceived signal strength of the nodes to identify the best possible route to the destination. reliability is achieved by selecting a number of intermediate nodes as waypoints and the route is divided into smaller segments by the waypoints. One distinct ad-vantage of this model is that when a node on the route moves out or fails, instead of discarding the whole original route, only the two waypoint nodes of the broken segment are used to find a new path. rEpU outperforms traditional schemes by establishing an energy-efficient path and also takes care of efficient route maintenance. Simulation results show that this routing scheme achieves much higher performance than the classical routing protocols, even in the presence of high node density, and overcomes simul-taneous packet forwarding.

关键词： Wireless sensor networks (WSNs) routing Energy efficiency received signal strength indicator (rSSI) route repair Waypoint

Behavior of an indigenously fabricated transferred arc plasma furnace for smelting studies

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plasma Science and Technology 2018年第3期20卷 136-145页

作者： A K MANDAL r K DISHWAr O p SINHA Department of Metallurgical Engineering IIT(BHU)

The utilization of industrial solid waste for metal recovery requires high-temperature tools due to the presence of silica and alumina, which is reducible at high temperature. In a plasma arc furnace, transferred arc plasma furnace（TAp） can meet all requirements, but the disadvantage of this technology is the high cost. For performing experiments in the laboratory, the TAp was fabricated indigenously in a laboratory based on the different inputs provided in the literature for the furnace design and fabrication. The observed parameters such as arc length, energy consumption, graphite electrode consumption, noise level as well as lining erosion were characterized for this fabricated furnace. The nitrogen plasma increased by around 200 K（200 ℃） melt temperature and noise levels decreased by ~10 d B compared to a normal *** plasma offered 100 K（100 ℃） higher melt temperature with ~5 d B higher sound level than nitrogen plasma. Nitrogen plasma arc melting showed lower electrode and energy consumption than normal arc melting, whereas hydrogen plasma showed lower energy consumption and higher electrode consumption in comparison to nitrogen plasma. The higher plasma arc temperature resulted in a shorter meltdown time than normal arc with smoother arcing. Hydrogen plasma permitted more heats, reduced meltdown time, and lower energy consumption, but with increased graphite consumption and crucible wear. The present study showed that the fabricated arc plasma is better than the normal arc furnace with respect to temperature generation, energy consumption, and environmental friendliness. Therefore, it could be used effectively for smelting-reduction studies.

关键词： smelting transferred arc plasma furnace characterization hydrogen and nitrogen plasma hollow electrode graphite and magnesite lining