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Synthesis and Characterization of Transition Metals Doped ZnO Nanorods

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Journal of Materials Science & Technology 2012年第7期28卷 587-593页

作者： g.Murugadoss Department of Physics Annamalai University

Different morphologies of undoped and transition metals （Mn, Co and Ni） doped one-dimensional （ID） ZnO nanocrystals were successfully synthesized by chemical method in an air atmosphere using polyvinylpyrrolidone （PVP） as a surfactant. The structure and optical properties were studied by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, thermal gravimetric analysis （TgA）, ultraviolet visible （UV-vis） absorption spectra and photoluminescence （PL） spectra. The doped ZnO nanorods exhibited a blue-shifted band gap and enhanced ultraviolet （UV） emission. In addition defect related emission was observed for the doped ZnO.

关键词： ZnO Luminescence Defect Transmission electron microscopy (TEM)

Synthesis and photoluminescence properties of zinc sulfide nanoparticles doped with copper using effective surfactants

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Particuology 2013年第5期11卷 566-573页

作者： g.Murugadoss Centre for Nanoscience and Technology Anna University

Zinc sulfide （ZnS）, various concentrations of Cu2＋（0.25%-1.25%）-doped ZnS and ZnS：Cu2~ nanoparticles capped with various surfactants have been successfully synthesized by a chemical precipitation method in ambient air at 80 ~C. The synthesized particles were characterized by UV-visible absorption （UV-vis）, X-ray diffraction （XRD）, transmission electron microscopy （TEM）, and Fourier transform infrared （FT-1R） and photoluminescence （PL） spectroscopy. The absorption peaks of the synthesized nanoparticles were noticeably blue-shifted from the bulk material. The XRD analysis confirmed the formation of a cubic phase for all samples. The average size of the particles ranged from 3.2 to 5.3 nm. The TEM analysis showed that the particles were highly monodispersed and spherical in shape. Particles with increased Cu2＋ concentrations had a red shift in their PL emission spectra. Enhanced PL emissions were observed for surfactant-capped particles. The experimental results indicate that, as expected, the PL spectrum confirms the presence of Cu2＋ ions in the ZnS nanoparticles.

关键词： NanoparticlesDopingSurfactantQuantum confinementRed shift

generalized analytical solutions for certain coupled simple chaotic systems

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Chinese Physics B 2017年第5期26卷 71-81页

作者： g Sivaganesh A Arulgnanam Department of Physics Alagappa Chettiar College of Engineering & Technology Karaikudi Tamilnadu-630 004 India Department of Physics St. John's College Palayamkottai Tamilnadu-627 002 India

We present a generalized analytical solution to the normalized state equations of a class of coupled simple secondorder non-autonomous circuit systems. The analytical solutions thus obtained are used to study the synchronization dynamics of two different types of circuit systems, differing only by their constituting nonlinear element. The synchronization dynamics of the coupled systems is studied through two-parameter bifurcation diagrams, phase portraits, and time-series plots obtained from the explicit analytical solutions. Experimental figures are presented to substantiate the analytical results. The generalization of the analytical solution for other types of coupled simple chaotic systems is discussed. The synchronization dynamics of the coupled chaotic systems studied through two-parameter bifurcation diagrams obtained from the explicit analytical solutions is reported for the first time.

关键词： chaotic bifurcation normalized identical chaos exponent Pecora generalization circuits explicit

Tomographic study of the deep tectonics in the Yecheng-Shiquanhe area of the Tibetan Plateau

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Science China Earth Sciences 2005年第4期48卷 477-483页

作者： g. Wittlinger g. Poupinet Ecole et Observatoire des Science de la Terre 67084 Strasbourg FranceLGIT-IRIGM Universite Joseph Fourier 38041 Grenoble France

The Yecheng-Shiquanhe profile runs over the western Tibetan Plateau from the south margin of the Tarim Basin, crossing the west Kunlun orogeny, to the east of Karakorum. The authors applied body waves to 3-dimensional inversion of travel time residuals and outlined the deep tectonic pattern of the northwestern Tibetan Plateau. An image was obtained, showing that the Tarim lithosphere is subducted southwards underneath the west Kunlun orogeny at an angle of 40° and a depth of 280 km. Surface structures are well expressed in the image and can be further traced in deeper levels. The prominent finding is that the gozha Fault and Karakax Fault are likely to join together beyond a depth of ～200 km, which is the very zone of active seismicity.

关键词： west Kunlun, lithosphere, velocity perturbation, subduction.

On the pressure and stress singularities induced by steady flows of a pair of nonmiscible,incompressible,viscous fluids contacting a wall with slip

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Acta Mechanica Sinica 2020年第3期36卷 686-691页

作者： g.B.Sinclair Department of Mechanical Engineering Louisiana State UniversityBaton RougeLA 70803USA

An earlier asymptotic analysis identified the flow-induced power and log singularities present when two nonmiscible,incompressible,viscous fluids contact a wall with no slip *** a parallel asymptotic analysis identifies such singularities in pressures and stresses when slip is *** the singularity exponents for the two types of contact conditions are similar,the angles of interface impingement that have either power or log singularities are usually quite distinct.

关键词： Incompressible viscous fluids Slip conditions Fluid-structure interactions Singular stresses

gTCS-Vagus Nerve Stimulator Automation Using Private IoT-Blockchain Smartcontract

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Computer Systems Science & Engineering 2023年第2期44卷 1325-1340页

作者： g.Karthikeyan g.Kousalya Coimbatore Institute of Technology CoimbatoreIndia

generalized Tonic Clonic Seizure(gTCS)is a form of epileptic seizure in which a patient loses control over their entire body,ultimately leading to loss of *** Vagus Nerve Stimulator(VNS)is a tool/method for treating epileptic episodes that sends counter-electrical stimulations to the Vagus Nerve in order to mitigate epileptic signals from the *** machine is a stand-alone device that depends on human *** proposed framework uses an IoT and Blockchain oversight mechanism to augment the device's *** system counteracts against false-activation by monitoring the patient's vitals through a smart watch and allows only legitimate *** nominal operating threshold is determined by preprocessing inferences that include an 18-year-old gTCS epileptic patient and a data set of 281 non-gTCS epileptic *** proposed system functions as a dual control lock where the IoT system and the manually activation system work in tandem to activate the *** on the values sensed by the IoT device,the deployed system is able to make deci-sions and regulate the use of the *** IoT-Blockchain framework is able to fully eradicate false activation by increasing accuracy and transparency,ensur-ing the device is used correctly and safely.

关键词： IoT gTCS vagus nerve stimulator blockchain smart contract

Critical interfaces in body armour systems

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Defence Technology（防务技术） 2021年第6期17卷 1887-1894页

作者： Ian g.Crouch Ulverston Armour Solutions UlverstonLA127BJCumbriaUK

The ballistic performance,and behaviour,of an armour system is governed by two major sets of variables,geometrical and *** these,the consistency of performance,especially against small arms ammunition,will depend upon the consistency of the properties of the constituent *** a body armour system for example,fibre diameter,areal density of woven fabric,and bulk density of ceramic are examples of critical parameters and monitoring such parameters will form the backbone of associated quality control *** is often overlooked,because it can fall into the User’s domain,are the interfaces that exist between the various products;the carrier,the Soft Armour Insert(SAI),and the one or two hard armour plates(HAP1 and HAP2).This is especially true if the various products are sourced from different suppliers.

关键词： Interfaces Body armour Body armor Ceramic armour UHMWPE Aramids Ballistic fibres Fabrics Interfacial materials Hard armour plates Soft vests

Trajectory predictions of new lift separation sabots

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Defence Technology（防务技术） 2021年第4期17卷 1361-1373页

作者： Sreelal Mohanan Rajesh g Department of Aerospace Engineering Indian Institute of Technology MadrasChennaiTamilnadu600036India

This paper presents a modified analytical model to evaluate the trajectories of various lift separation sabot *** aerodynamic forces acting on the sabot surfaces during a supersonic flight are modeled in the present analytical model by incorporating the pressures on the windward side of the sabot due to the detached/attached shock and its reflections and then integrated using the 3-DoF dynamical *** trajectory and the aerodynamic coefficients were obtained for these configurations at a projectile Mach number of *** sabot configurations,which include two new designs,are compared with each other and with the conventional free flight trajectory data of the conventional *** mechanical interaction between the sabot and projectile is also addressed in the present *** comparison shows that the new designs with the aerodynamic surfaces close to the center of gravity,lift-off from the projectile with minimal mechanical interaction compared to a conventional sabot.

关键词： Lift separation Sabot Trajectory Shock reflection

Bianchi type I in f(T) gravitational theories

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Chinese Physics B 2016年第5期25卷 58-64页

作者： M I Wanas g g L Nashed O A Ibrahim Astronomy Department Faculty of Science Cairo University Cairo Egypt Centre for Theoretical Physics The British University in Egypt El-Sherouk City Egypt Mathematics Department Faculty of Science Ain Shams University Cairo Egypt Egyptian Relativity group (ERg) Giza Egypt

A tetrad field that is homogeneous and anisotropic which contains two unknown functions A（t） and B（t） of cosmic time is applied to the field equations of f（T）, where T is the torsion scalar, T = T~μ_（νρ）S_μ^（νρ）. We calculate the equation of continuity and rewrite it as a product of two brackets, the first is a function of f（T） and the second is a function of the two unknowns A（t） and B（t）. We use two different relations between the two unknown functions A（t） and B（t） in the second bracket to solve it. Both of these relations give constant scalar torsion and solutions coincide with the de Sitter one. So,another assumption related to the contents of the matter fields is postulated. This assumption enables us to drive a solution with a non-constant value of the scalar torsion and a form of f（T） which represents ΛCDM.

关键词： f(T) gravitational theory Bianchi type I special solutions