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Implementation of High-Q Embedded Band Pass Filter in Wireless Communication

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Intelligent Automation & soft Computing 2023年第5期36卷 2191-2200页

作者： V.satheesh Kumar s.ramesh Department of Electronics and Communication Engineering T.J.S Engineering CollegeChennaiTamilNadu601206India Valliammai Engineering College ChennaiTamil Nadu603203India

At 12.8 MHz center frequency,the advanced miniaturized polymer-based planar high quality factor(Q)passive elements embedded bandpassﬁlter works in the *** most of the demands operate inside the spectrum,the wideband or high-speed operation necessary to enhance must be acquired in microwave frequency *** channel has a quiet,high-performance micro-ﬁlter with wideband *** and inductors are used in the high quality factor(Q)passive components,and related networks are incorporated in theﬁ*** layers are concatenated using Three-Dimensional Integrated Circuit(3D-IC)integration,parasitics are removed,and interconnection losses are negotiated using de-embedding methods.A wireless application-based Liquid Crystalline Polymer(LCP)viewpoint is employed as a substrate material in this *** polymer processes,their properties,and the incorporated high-Q Band Pass Filter *** suggestedﬁlter model is computed and manufactured utilizing the L-band frequency spectrum,decreasing total physical length by 31%while increasing bandwidth by 45%.

关键词： Bandpassﬁlter wireless communication frequency spectrum embedded technology

Investigation of dry sliding wear properties of multi-directional forged Mg-Zn alloys

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Journal of Magnesium and Alloys 2019年第3期7卷 444-455页

作者： s.ramesh Gajanan Anne H.shivananda Nayaka sandeep sahu M.R.ramesh Department of Mechanical Engineering National Institute of Technology KarnatakaSurathkal 575025India Department of Mechanical Engineering Shri Madhwa Vadiraja Institute of Technology and ManagementUdupiKarnataka 574115India Department of Materials science and Engineering Indian Institute of Technology KanpurKanpur 208016India

Effect of multi-directional forging(MDF)on wear properties of Mg-Zn alloys(with 2,4,and 6wt%Zn)is *** sliding wear test was performed using pin on disk machine on MDF processed and homogenized *** behavior of samples was analyzed at loads of ION and 20 N,with sliding distances of 2000m and 4000m,at a sliding velocity of 3m/*** of worn samples were observed under scanning electron microscopy(sEM),energy dispersive spectroscopy(EDs),and x-ray diffraction(XRD)and the results were *** properties were evaluated using microhardness *** 5 passes of MDF,the average grain size was found to be 30±4p m,22±3 pm,and 18±3 pm,in Mg-2%Zn,Mg-4%Zn,and Mg-6%Zn alloys,respectively,with significant improvement in hardness in all *** resistance was improved after MDF processing,as well as,with increment in Zn content in Mg ***,it decreased when the load and the sliding distance *** surface exhibited ploughing,delamination,plastic deformation,and wear debris along sliding direction,and abrasive wear was found to be the main mechanism.

关键词： Multi-directional forging Mg-Zn alloy Microhardness Wear Coefficient of friction

Closed-Form solutions of stress Intensity Factors for semi-elliptical surface Cracks in a Cylindrical Bar Under Pure Tension

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Acta Mechanica solida sinica 2022年第2期35卷 344-356页

作者： M.K.Ramezani s.ramesh J.Purbolaksono R.Das Centre of Advanced Manufacturing and Materials Processing Department of Mechanical EngineeringFaculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia Department of Mechanical Engineering University of PertaminaJakarta 12220Indonesia sir Lawrence Wackett Aerospace Research Centre School of EngineeringRMIT UniversityMelbourneVI 3000Australia

In this work,the stress intensity factors(sIFs)for a wide range of semi-elliptical surface cracks with different inclination angles in a cylindrical bar subjected to pure tension were investigated *** main parameters considered to evaluate the sIFs were the crack size ratio(a/d),the crack aspect ratio(a/c),and the crack inclination angle(0).The dual-boundary element met hod implemented in software BEAsY was used to compute the sIF values for *** her more,the general closed-form solutions were proposed to evaluate the corresponding sIFs for Mode I,Mode II and Mode III types of fracture through curve fitting *** solutions can provide accurate and reliable values of stress intensity factors for a crack on a cylindrical bar under pure tension in a rapid way compared to those obtained using computational *** addition,these results can be used as inputs for failure studies and life evaluations of cracked cylinder under working conditions.

关键词： stress intensity factor surface crack solid cylinder Closed-form solution Dual-boundary element method

sonochemical synthesis of nanostructured nickel hydroxide as an electrode material for improved electrochemical energy storage application

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Progress in Natural science:Materials International 2017年第4期27卷 416-423页

作者： Arshid Numan Navaneethan Duraisamy Fatin saiha Omar Dhanaraj Gopi K.ramesh s.ramesh Center for Ionics University of Malaya Department of Physics Faculty of Science University of Malaya Department of Chemistry Periyar University

A facile and fast approach for the synthesis of a nanostructured nickel hydroxide(Ni（OH）;) via sonochemical technique is reported in the present study. The X-ray diffraction results confirmed that the synthesized Ni（OH）;was oriented in β-phase of hexagonal brucite structure. The nanostructured Ni（OH）;electrode exhibited the maximum specific capacitance of 1256 F/g at a current density of 200 mA/g in 1 M KOH;. Ni（OH）;electrodes exhibited the pseudocapacitive behavior due to the presence of redox reaction. It also exhibited long-term cyclic stability of 85% after 2000 cycles, suggesting that the nanostructured Ni（OH）;electrode will play a promising role for high performance supercapacitor application.

关键词： Nickel hydroxide sonochemical synthesis surface morphology Electrode materials

Pattern Recognition of Modulation signal Classification Using Deep Neural Networks

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Computer systems science & Engineering 2022年第11期43卷 545-558页

作者： D.Venugopal V.Mohan s.ramesh s.Janupriya sangsoon Lim seifedine Kadry Department of Electronics and Communication Engineering KPR Institute of Engineering and TechnologyCoimbatore641048India Department of Electronics and Communication Engineering Saranathan College of EngineeringTrichy620012India Department of Computer science and Engineering Krishnasamy College of Engineering&TechnologyCuddalore607109India Department of Electronics and Communication Engineering K.Ramakrishnan College of EngineeringTiruchirappalli621112India Department of Computer Engineering Sungkyul UniversityAnyangKorea Department of Applied Data science Noroff University CollegeKristiansandNorway

In recent times,pattern recognition of communication modulation signals has gained significant attention in several application areas such as military,civilian field,*** becomes essential to design a safe and robust feature extraction(FE)approach to efficiently identify the various signal modulation types in a complex *** works have derived new techniques to extract the feature parameters namely instant features,fractal features,and so *** addition,machine learning(ML)and deep learning(DL)approaches can be commonly employed for modulation signal *** this view,this paper designs pattern recognition of communication signal modulation using fractal features with deep neural networks(CsM-FFDNN).The goal of the CsM-FFDNN model is to classify the different types of digitally modulated *** proposed CsM-FFDNN model involves two major processes namely FE and *** proposed model uses sevcik Fractal Dimension(sFD)technique to extract the fractal features from the digital modulated ***,the extracted features are fed into the DNN model for modulation signal *** improve the classification performance of the DNN model,a barnacles mating optimizer(BMO)is used for the hyperparameter tuning of the DNN model in such a way that the DNN performance can be raised.A wide range of simulations takes place to highlight the enhanced performance of the CsM-FFDNN *** experimental outcomes pointed out the superior recognition rate of the CsM-FFDNN model over the recent state of art methods interms of different evaluation parameters.

关键词： Pattern recognition signal modulation communication signals deep learning feature extraction

Effect of processing routes on microstructure and mechanical properties of 2014 Al alloy processed by equal channel angular pressing

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Transactions of Nonferrous Metals society of China 2010年第10期20卷 1822-1828页

作者： P.VENKATACHALAM s.ramesh KUMAR B.RAVIsANKAR V.THOMAs PAUL M.VIJAYALAKsHMI Department of Metallurgical and Materials Engineering National Institute of Technology Physical Metallurgy Division IGCAR

Al-Cu alloy was deformed through equal channel angular pressing(ECAP) by routes A,Ba,Bc and C up to 5 *** was done using a 90° die for three different conditions,namely 1) as received,2) solutionised at 768 K for 1 h and 3) solutionised at 768 K for 1 h + aged at 468 K for 5 *** microstructure,microhardness and tensile strength were studied for all the three conditions and four *** improvement in hardness(HV 184 after five passes) and strength(602 MPa after three passes) was observed in solutionised and aged 2014 Al alloy deformed through route *** evolution was reasonably equiaxed in route Bc with aspect ratio of *** and aged 2014 Al alloy deformed through route Bc was identified to have better microstructure and mechanical property than the other processing routes and conditions.

关键词： ECAP processing route 2014 aluminium alloy

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Hierarchically designed MoWse_(2)/WO_(3)/C anode for fast and efficient Na+storage

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Journal of Energy Chemistry 2023年第5期80卷 291-301,I0008页

作者： Jian Wang Yachuan shao Fei Yuan Huilan sun Di Zhang Zhaojin Li s.ramesh H.J.Woo Bo Wang Centre for Ionics University of Malay1 Department of PhysicsFaculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Hebei Key Laboratory of Flexible Functional Materials School of Materials Science and EngineeringHebei University of Science and TechnologyShjiazhuang 0500000HebeiChina

Exploring anode materials with high energy and power density is one of the critical milestones in developing sodium-ion batteries/capacitors(sIBs/sICs).Here,the Mo and W-based bimetallic organic framework(Mo-W-MOF)with core-shell structure is first formed by a facile strategy,followed by a selenization and carbonization strategy to finally prepare multileveled Mo Wse_(2)/WO_(3)/C anode materials with core-shell petal like curled nanosheet *** the petal(Mose_(2))-core(WO_(3))structure,the formation of Wse_(2)flakes by partial selenization on the surface of WO_(3)serves as a heterogeneous connection between Mose_(2)and WO_(3).The enlarged layer distance(0.677 nm)between Mose_(2)and Wse_(2)can facilitate the rapid transfer of Na+and *** density functional theory(DFT)calculations verify that the Mo Wse_(2)/WO_(3)/C heterostructure performs excellent metallic ***-situ X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPs),and transmission electron microscopy(TEM)confirm the activation process from the initial insertion reaction to the later conversion ***,when employed as the anode of sIBs,a remarkable capacity of 384.3 mA h g-1after 950 cycles at 10 A g^(-1)is ***,the sICs assembled with commercial activated carbon(AC)as the cathode exhibits a remarkable energy density of 81.86 W h kg^(-1)(at 190 W kg^(-1))and 72.83 W h kg^(-1)(at 3800 W kg^(-1)).The unique structural design and the reaction investigation of the electrode process can provide a reference for the development of transition metal chalcogenides anodes.

关键词： Multileveled MoWse2/WO_(3)/C structure change Heterostructure Metallic properties Enlarged lattice distance The activation process

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Modelling of electric vehicle charging station and controlled by fuzzy logic controller with different modes of operation

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Journal of Control and Decision 2023年第1期10卷 26-39页

作者： s.C.Vijay Kumar K.Karunanithi s.P.Raja s.ramesh P.Chandrasekar R.Obulupathy vel tech rangarajan dr.sagunthala r&d institute of science and technology chennaitamil naduindia school of computer science and engineering vellore institute of technologyvelloretamil naduindia

The main objective of implementing charging stations is to ensure the good charging to theElectric Vehicles by using a solar PV array which is interconnected to the battery energy storagesystems. The charging station regulates the supply voltage and frequency without the use of amechanical speed governor. It also assures that energy gained from grid or by the DG set willhave the unity power factor (UPF) when the load is nonlinear. Besides this, the Point of CommonCoupling (PCC) voltage is synchronised with the grid/generator voltage in order to providecontinuous charging. In order to increase the optimal efficiency of the charging stations, thecharging stations will perform the active/reactive power transfer from the vehicle to grid, vehicleto house and vehicle to vehicle (V2V) power transfer. The operational experiment of the chargingstation is simulated and verified by using MATLAB/sIMULINK.

关键词： Electric vehicle charging station solar photo-voltaic generation energy transfer diesel-generator set fuzzy logic controller total harmonic distortion

Properties of Al_2O_3-sm_2O_3-CeO_2 electrolyte

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Transactions of Nonferrous Metals society of China 2012年第6期22卷 1486-1494页

作者： s.ramesh K.C.J.RAJU C.V.REDDY school of Physics University of HyderabadHyderabad 500046India Department of Physics Osmania UniversityHyderabad 500007India

Cel-xsmxO2 （x=0, 0.1, 0.2 and 0.3） and sm-doped ceria＋（2%-8%）Al2O3 were synthesized through sol-gel process followed by low temperature combustion. The synthesis, structure, densification, conductivity and thermal expansion were studied, and the structure and phase were confirmed by XRD. Dense ceramics were obtained through sintering the pellets at 1300 ℃. 2% and 4% Al2O3 were added into Ce0.8sm0.2O2 to promote the densification at 1250 ℃. The surface morphology of the sintered pellets was analyzed using sEM. A two-probe AC impedance spectroscopy was used to study the total ionic conductivity.

关键词： sol-gel process XRD-rietveld impedance spectroscopy ionic conductivity electrolyte ceramics

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