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Enhancement of coercivity,permeability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites for memory and high frequency devices

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Journal of Rare Earths 2024年第6期42卷 1128-1135,I0005页

作者： i.Sardar M.D.Hossain M.S.Sikder M.N.i.khan M.R.Rahman Physics Discipline Khulna UniversityKhulna9208Bangladesh Department of Physics Khulna University of Engineering&TechnologyKhulna9203Bangladesh Department ofComputer Science and Engineering Northern University of Business&Technology KhulnaKhulna9100Bangladesh Material Science Division Atomic Energy CentreDhaka1000Bangladesh

Spinel cubic ferrites have huge applications in me mory and high frequency *** the improvement of these modern devices,the magnetic coercivity,permeability,and dielectric properties of a ferrite are the important *** article focuses on improving the magnetic coercivity,magnetic permeability,and dielectric properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ferrites,where x=0.00,0.06,and *** X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTiR),field emission scanning electron microscopy(FESEM),energy dispersive X-ray(EDX),vibrating sample magnetometer(VSM),and an impedance analyzer were used to characterize the structural,magnetic,and dielectric properties of the *** XRD patterns indicate the formation of spinel cubic structure of the samples with a secondary peak(EuFeO_(3))for Eu doped *** densities and porosities of the samples follow an inverse trend,where the doped samples’lattice parameters are increased with the increment of rare earth Eu *** FTiR analysis also proves the spinel cubic phase of the *** average grain size of the ferrites is obtained via FESEM images,and it is increased from 121 to 198 *** analysis confirms that doping of the Eu content also changes other hysteresis loop properties of Co_(0.2)Zn_(0.3)Ni_(0.5)Eu_(x)Fe_(2-x)O_(4) ***,the coercivity of the Eu doped samples is greater than that of the mother alloy(x=0.00).The EDX study shows that there is no impurity contamination in the *** permeability and dielectric measurements show an improved quality factor of the Eu-doped samples with low magnetic and dielectric *** dependent resistivity and impedance analysis also show the improved *** the observed properties of the samples,all the investigated ferrites might be strong candidates for potential applications in memory devices,magnetic sensors,and high frequency applications.

关键词： Ferrites Raree arths Coercivity Permeability EDX Resistivity

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SPONTANEOUS PNEUMOTHORAX iN THE NEW BORN

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Chinese Medical Journal 1932年第10期46卷 986-991页

作者： kha T’i LiM Department of Obstetries and Gynecology Peiping Union Medical CollegePeiping.

Spontaneous pnenmothorax in the new born is,as far as we know,of such rare occurrence that it justifies being put on *** itis possible that if X-ray studies were made systematically of all newborn babies with defective or disordered respiration,the conditionmight prove to be not quite so rare as it seems to *** patient in this case was a full term Chinese male baby,(***.33957)born in the Peiping Union Medical College Hospital on Nov.22nd,1931.A pneu-mothorax on the right side was discovered by a roentgenogram taken on Nov.26th,when the baby was five days *** the time of birth,there was considerabledifficulty in delivering the *** only was the cord a short one,but it

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Coexisting charge density wave and ferromagnetic instabilities in monolayer inSe

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npj Computational Materials 2022年第1期8卷 1101-1109页

作者： Evgeny A.Stepanov Viktor Harkov Malte Rösner Alexander i.Lichtenstein Mikhail i.Katsnelson Alexander N.Rudenko CPHT CNRSEcole PolytechniqueInstitut Polytechnique de ParisF-91128PalaiseauFrance i.institute of Theoretical Physics University of HamburgNotkestraße 922607HamburgGermany European X-Ray Free-Electron Laser Facility Holzkoppel 422869SchenefeldGermany Radboud University Institute for Molecules and Materials6525AJNijmegenThe Netherlands The Hamburg Centre for Ultrafast imaging Luruper Chaussee 14922761HamburgGermany

Recently fabricated inSe monolayers exhibit remarkable characteristics that indicate the potential of this material to host a number of many-body *** this work,we systematically describe collective electronic effects in hole-doped inSe monolayers using advanced many-body *** this end,we derive a realistic electronic-structure model from first principles that takes into account the most important characteristics of this material,including a flat band with prominent van Hove singularities in the electronic spectrum,strong electron–phonon coupling,and weakly screened long-ranged Coulomb *** calculate the temperature-dependent phase diagram as a function of band filling and observe that this system is in a regime with coexisting charge density wave and ferromagnetic instabilities that are driven by strong electronic Coulomb *** regime can be achieved at realistic doping levels and high enough temperatures,and can be verified *** find that the electron–phonon interaction does not play a crucial role in these effects,effectively suppressing the local Coulomb interaction without changing the qualitative physical picture.

关键词： ferromagnetic charge wave

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A computational study on the optical shaping of gas targets via blast wave collisions for magnetic vortex acceleration

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High Power Laser Science and Engineering 2022年第5期10卷 35-49页

作者： i.Tazes S.Passalidis E.Kaselouris i.Fitilis M.Bakarezos N.A.Papadogiannis M.Tatarakis V.Dimitriou institute of Plasma Physics and Lasers-iPPL Hellenic Mediterranean University Research CentreRethymnonGreece Department of Electronic Engineering Hellenic Mediterranean UniversityChaniaGreece CNRS Laboratoire de Chimie Physique-Matière et RayonnementSorbonne UniversitéParisFrance Department of Music Technology and Acoustics Hellenic Mediterranean UniversityRethymnonGreece

This research work emphasizes the capability of delivering optically shaped targets through the interaction of nanosecond laser pulses with high-density gas-jet profiles,and explores proton acceleration in the near-critical density regime via magnetic vortex acceleration(MVA).Multiple blast waves(BWs)are generated by laser pulses that compress the gas-jet into near-critical steep gradient slabs of a few micrometres *** alternatives for delivering the laser pulses into the gas target are explored to efficiently control the characteristics of the density *** shock front collisions of the generated BWs are computationally studied by 3D magnetohydrodynamic *** efficiency of the proposed target shaping method for MVA is demonstrated for TW-class lasers by a particle-in-cell simulation.

关键词： blast waves particle acceleration magnetic vortex acceleration MHD simulations PiC simulations

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Large anomalous Hall, Nernst effect and topological phases in the 3d-4d/5d-based oxide double perovskites

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npj Computational Materials 2023年第1期9卷 613-622页

作者： Kartik Samanta Jonathan Noky iñigo Robredo Juergen Kuebler Maia G.Vergniory Claudia Felser Max Planck institute for Chemical Physics of Solids 01187 DresdenGermany Donostia international Physics Center 20018 Donostia-San SebastiánSpain Technische Universitaet Darmstadt 64289 DarmstadtGermany Department of Physics and Astronomy University of Nebraska-LincolnLincolnNE 68588USA

Magnetism and spin-orbit coupling are two fundamental and interconnected properties of oxide materials,that can give rise to various topological transport phenomena,including anomalous Hall and anomalous Nernst *** transport responses can be significantly enhanced by designing an electronic structure with a large Berry *** this context,rocksalt-ordered double perovskites(DP),denoted as A2BB’O6,with two distinct transition metal sites are very powerful platforms for exploration and *** this work,we present a comprehensive study based on the intrinsic anomalous transport in cubic and tetragonal stable DP compounds with 3d-4d/5d *** findings reveal that certain DP compounds show a large anomalous Hall effect,displaying topological band crossings in the proximity of the Fermi energy.

关键词： topological perovskite Nernst

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MHD flow and heat transfer of a hybrid nanofluid past a permeable stretching/shrinking wedge

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Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 507-520页

作者： i.WAiNi A.iSHAK i.POP Fakulti Teknologi Kejuruteraan Mekanikal dan Pembuatan Universiti Teknikal Malaysia MelakaHang Tuah JayaDurian Tunggal 76100MelakaMalaysia Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan MalaysiaUKM Bangi 43600SelangorMalaysia Department of Mathematics Babe¸s-Bolyai UniversityCluj-Napoca 400084Romania

The steady flow and heat transfer of a hybrid nanofluid past a permeable stretching/shrinking wedge with magnetic field and radiation effects are studied. The governing equations of the hybrid nanofluid are converted to the similarity equations by techniques of the similarity transformation. The bvp4c function that is available in MATLAB software is utilized for solving the similarity equations numerically. The numerical results are obtained for selected different values of parameters. The results discover that two solutions exist, up to a certain value of the stretching/shrinking and suction strengths. The critical value in which the solution is in existence decreases as nanoparticle volume fractions for copper and wedge angle parameter increase. it is also found that the hybrid nanofluid enhances the heat transfer rate compared with the regular nanofluid. The reduction of the heat transfer rate is observed with the increase in radiation parameter. The temporal stability analysis is performed to analyze the stability of the dual solutions, and it is revealed that only one of them is stable and physically reliable.

关键词： dual solution hybrid nanofluid stretching/shrinking wedge magnetic field radiation stability analysis

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A plant-based diet supplemented with Hermetia illucens alone or in combination with poultry by-product meal:one step closer to sustainable aquafeeds for European seabass

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Journal of Animal Science and Biotechnology 2022年第6期13卷 1818-1839页

作者： vana Lepen Pleić ivana Bušelić Maria Messina Jerko Hrabar LukaŽuvić igor Talijančić ivaŽužul Tina Pavelin ivana Anđelić Jelka Pleadin Jasna Puizina Leon Grubišić Emilio Tibaldiand TanjaŠegvić-Bubić Laboratory of Aquaculture Institute of Oceanography and FisheriesŠetalište I.Meštrovića 6321000 SplitCroatia Department of Agriculture FoodEnvironmental and Animal SciencesUniversity of UdineUdineItaly Department of Chemistry Faculty of ScienceUniversity of SplitRuđera Boškovića 3321000 SplitCroatia Croatian Veterinary institute Laboratory for Analytical ChemistrySavska Cesta 14310000ZagrebCroatia Department of Biology Faculty of ScienceUniversity of SplitRuđera Boškovića 3321000 SplitCroatia

Background:increasing demand for high-value fish species and pressure on forage fish is challenging aquaculture to ensure sustainable growth by replacing protein sources in aquafeeds with plant and terrestrial animal proteins,without compromising the economic value and quality of the final fish *** the present study,the effects of a plant protein-based diet(CV),two plant-based diets in which graded amounts of plan protein mixtures were replaced with Hermetia illucens meal alone(VH10)or in combination with poultry by-product meal(PBM)(VH10P30),a fishmeal(FM)diet(CF)and an FM diet supplemented with ***(FH10)on growth performance,gut health and homeostasis of farmed subadult European seabass were tested and ***:Fish fed the VH10 and VH10P30 diets showed the highest specific growth rates and lowest feed conversion ratios among the tested ***,the best preservation of Pi morphology was observed in fish fed the CF or FH10 diets,while fish fed the CV diet exhibited significant degenerative changes in the proximal and distal ***,PBM supplementation mitigated these effects and significantly improved all gut morphometric parameters in the VH10P30 *** substitution of the plant mixture with insect meal alone or PBM also induced most BBM genes and activated BBM enzymes,suggesting a beneficial effect on intestinal digestive/absorption *** intestinal microbiota,fish fed diets containing *** meal(FH10,VH10,VH10P30)had the highest richness of bacterial communities and abundance of beneficial genera such as Lactobacillus and *** the other hand,fish fed CV had the highest microbial diversity but lost a significant component of fish intestinal microbiota,the phylum ***,skin pigmentation most similar to that of farmed or even wild seabass was also observed in the fish groups fed CF,FH10 or ***:Plant-based diets supplemented with PBM and *** pupae meal h

关键词： Avian by-product meal Circular economy Dicentrarchus labrax Fitness Growth insect

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氧气煤粉熔剂复合喷吹（OCF）高炉炼铁工艺的研究

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钢铁 1994年第6期29卷 13-18,37页

作者：高征铠 Somm.,id 钢铁研究总院

本文提出ＯＣＦ高炉炼铁工艺，即由风口鼓入常温工业氧气和少量的炉顶循环煤气，同时喷吹大量煤粉和熔剂，用制氧机取代传统高炉工艺中的鼓风机和热风炉。模拟计算表明，使用高品位球团矿，每吨生铁喷吹４００ｋｇ煤粉和６０．５ｋｇ石... 详细信息

本文提出ＯＣＦ高炉炼铁工艺，即由风口鼓入常温工业氧气和少量的炉顶循环煤气，同时喷吹大量煤粉和熔剂，用制氧机取代传统高炉工艺中的鼓风机和热风炉。模拟计算表明，使用高品位球团矿，每吨生铁喷吹４００ｋｇ煤粉和６０．５ｋｇ石灰粉时，焦比为９９ｋｇ，需９５％纯度的氧气２８８ｍ￣３，此工艺将改变高炉的原料结构和料柱组成，全面改善高炉冶炼过程，提高操作的稳定性和灵活性，使高炉设备简化，焦比降低，不但生铁产量大幅度提高，还外供大量热值为５．０～７．０ＭＪ／ｍ￣３的煤气。

关键词：高炉炼铁氧气煤粉熔剂复合喷吹

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Drones,virtual reality,and modeling:communicating catastrophic dam failure

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international Journal of Digital Earth 2022年第1期15卷 585-605页

作者： H.R.Spero i.Vazquez-Lopez K.Miller R.Joshaghani S.Cutchin J.Enterkine Department of Geosciences Boise State UniversityBoiseIDUSA Department of Computer Sciences Boise State UniversityBoiseIDUSA

Dam failures occur worldwide and can be economically and ecologically *** the scale of these risks to the general public and decision-makers is ***-dimensional(2D)dam failure hydraulic models inform owners and floodplain managers of flood regimes but have limitations when shared with *** study addresses these limitations by constructing a 3D Virtual Reality(VR)environment to display the 1976 Teton Dam disaster case study using a pipeline composed of(1)2D hydraulic model data(extrapolated into 3D),(2)a 3D reconstructed dam,and(3)a terrain model processed from UAS(Uncrewed Airborne System)imagery using Structure from Motion *** study validates the VR environment pipeline on the Oculus Quest 2 VR Headset with the criteria:immersion fidelity,movement,immersive soundscape,and agreement with historical observations and *** this VR environment,we develop an effective method to share historical events and,with future work,improve hazard awareness;applications of this method could improve citizen engagement with Early Warning *** paper establishes a pipeline to produce a visualization tool for merging UAS imagery,Virtual Reality,digital scene creation,and sophisticated 2D hydraulic models to communicate catastrophic flooding events from natural or human-made levees or dams.

关键词： Virtual Reality 3D modeling resilience dam failure photogrammetry

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Quantum dynamics of charge transfer on the one-dimensional lattice:Wave packet spreading and recurrence

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Chinese Physics B 2016年第1期25卷 817-830页

作者： V N Likhachev O i Shevaleevskii G A Vinogradov Emanuel institute of Biochemical Physics Russian Academy of Sciences

The wave function temporal evolution on the one-dimensional （id） lattice is considered in the tight-binding approxi- mation. The lattice consists of N equal sites and one impurity site （donor）. The donor differs from other lattice sites by the on-site electron energy E and the intersite coupling C. The moving wave packet is formed from the wave function initially localized on the donor. The exact solution for the wave packet velocity and the shape is derived at different values E and C. The velocity has the maximal possible group velocity v = 2. The wave packet width grows with time -t1/3 and its amplitude decreases ,- t-1/3. The wave packet reflects multiply from the lattice ends. Analytical expressions for the wave packet front propagation and recurrence are in good agreement with numeric simulations.

关键词： quantum dynamics tight-binding approximation charge transport

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