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Impedance spectroscopy and DFT/TD-DFT studies of diyttrium trioxide for optoelectronic fields

Journal of Rare Earths 2023年第4期41卷 605-612页

作者： Ali A.Alkathiri A.A.Atta moamen S.Refat Sonam Shakya A.m.Hassanien Saud A.Algarni Emad m.A.Ahmed Sultan E.Alomariy m.ham.ed alsawat Norah Algethami Department of Physics College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Department of Chemistry Aligarh Muslim UniversityAligarh202002India Department of Physics Faculty of Science and Humanity Studies at Al-QuwayiyahShaqra UniversityAl-Quwayiyah11971Saudi Arabia

Yttrium(Ⅲ)oxide or so-called diyttrium trioxide(Y_2O_3)is an excellent candidate ceramic material for optoelectronic ***,electrical conductivity,and dielectric relaxation properties of bulk yttrium(Ⅲ)oxide were studied.X-ray diffraction(XRD)results indicate that the yttrium(Ⅲ)oxide compound has a crystalline cubic *** transform infrared(FTIR)technique was used to ascertain the chemical structure of the yttrium(Ⅲ)oxide *** spectroscopy was used to analyze frequency-dependent electrical properties as a function of temperature in the range of 303-423 K and frequency range of 0.1 Hz-2 *** spectroscopy parameters such as dielectric constant,dielectric loss,loss factor,electric modulus,and complex impedance of the yttrium(Ⅲ)oxide compound were *** Nyquist plot describes the complex impedance of the yttrium(Ⅲ)oxide for different *** universal Jonscher's power law was used for the analysis of the complex electrical conductivity of the yttrium(Ⅲ)oxide *** is found that the real(σ')and imaginary(σ")parts of the complex conductivity increase with increasing *** exponent frequency(s)equals unity,which confirms that the predominant conduction mechanism is a nearly constant loss(NCL)***/TD-DFT studies using B3LYP/LanL2DZ level of theory were used to provide comparable theoretical data and electronic energy gap of HOmO→LUmO.

关键词： Yttrium(Ⅲ)oxidel Impedance spectroscopy DFT/TD-DFT Rare earths

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Performance Analysis of Curved Track G2T-FSO(Ground-to-Train Free Space Optical)model under Various Weather Conditions

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Computer modeling in Engineering & Sciences 2024年第12期141卷 2087-2105页

作者： m.ham.ed A.Alhartomi mohammad F.L.Abdullah Wafi A.B.mabrouk m.ham.ed S.m.Gismalla Ahmed Alzahmi Saeed Alzahrani mohammad R.Altimania m.ham.ed S.alsawat Department of Electrical Engineering University of TabukTabuk71491Saudi Arabia Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia(UTHM)Johor86400Malaysia Center for Communication Systems and Sensing King Fahd University of Petroleum and Minerals(KFUPM)Dhahran31261Saudi Arabia Department of mechanical Engineering University of TabukTabuk71491Saudi Arabia

The demand for broadband data services on high-speed trains is rapidly growing as more people commute between their homes and ***,current radio frequency(RF)technology cannot adequately meet this *** order to address the bandwidth constraint,a technique known as free space optics(FSO)has been *** paper presents a mathematical derivation and formulation of curve track G2T-FSO(Ground-to-train Free Space Optical)model,where the track radius characteristics is 2667 m,divergence angle track is 1.5°for train velocity at V=250 km/*** transmitter configurations are proposed to maximize coverage range and enhance curve track G2T-FSO link performance under varying weather *** curved track G2T-FSO model was evaluated in terms of received power,signal-to-noise ratio(SNR),bit error rate(BER),and eye *** results showed maximum coverage lengths of 618,505,365,and 240 m for 4Tx/1Rx,3Tx/1Rx,2Tx/1Rx,and 1Tx/1Rx configurations,*** analyzed results demonstrate that the G2T-FSO link can be effectively implemented under various weather conditions.

关键词： Free space optics curve track ground-to-train communications geometrical loss weather conditions

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