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Tuning structural,electrical,dielectric and magnetic properties of mg-Cu-Co ferrites via dysprosium(Dy^(3+))doping

Journal of Rare Earths 2024年第1期42卷 137-146,I0005页

作者： maria Akhtar m.S.Hasan nasir Am.n n.A.morley muhammad Imran Arshad Departm.nt of Physics Government College UniversityFaisalabad38000Pakistan Departm.nt of Physics The University of Lahore53700Pakistan Departm.nt of materials Science and Engineering The University of SheffieldS13JDUK Departm.nt of Physics&Astronomy University College LondonUK

In current research work,Dy3+substituted mg0.5Cu0.25Co0.25Fe2-xDyxO4(0.0≤x≤0.04 with the step interval of 0.01)soft ferrites were synthesized by the sol-gel auto combustion *** prepared samples were characterized by the techniques using X-ray diffraction(XRD),scanning electron microscopy(SEm),energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared(FTIR)spectroscopy,curre nt-voltage(Ⅰ-Ⅴ)measurem.nt,LCR meter,vibrating sample magnetometer(VSm)and *** data reveal that the average crystallite size is 49.71 nm and the lattice constant is 0.83703 nm for sample x=*** non-uniform grain growth was dem.nstrated by micrographs and impurity-free elem.ntal composition was observed from EDX *** DC resistivity has an increasing and decreasing trend in ferromagnetic and paramagnetic regions with an increase in ***,the high resistivity is observed with the order of 1010Ω·cm,and the activation energy is 0.944 eV for samples x=*** dielectric parameters including dielectric constant,dielectric losses,and impedance gradually decrease with the increase in frequency from 8 Hz to 8 *** m.nimum dielectric loss at high frequency is found for sample x=*** coercivity(Hc)and saturation magnetization(ms)are found in the ranges of 520.82-544.02 Oe and 20.5841-21.1473 emu/g,*** observations confirm that dysprosium(x=0.03)doped mCC-soft ferrites may be applicable in transformer cores,microwave absorbance,and telecomm.nication devices.

关键词： Soft ferrites DC resistivity Dielectric loss Impedance Coercivity Rare earths

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nanomotion of bacteria to determ.ne metabolic profile

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nanotechnology and Precision Engineering 2024年第1期7卷 1-9页

作者： S.n.Pleskova E.V.Lazarenko n.A.Bezrukov R.n.Kriukov A.V.Boryakov m.E.Dokukin S.I.Surodin Research Laboratory of Scanning Probe microscopy Lobachevsky State University of Nizhny NovgorodNizhny Novgorod 603950Russia Departm.nt of nanotechnology and Biotechnology Nizhny Novgorod State Technical University n.a.R.E.AlekseevNizhny Novgorod 603950Russia Sarov Physics and Technology Institute National Research Nuclear University MEPhISarov 607186Russia

In addition to their visible motion such as swimm.ng(e.g.,with the help ofﬂagella),bacteria can also exhibit nanomotion that is detectable only with highly sensitive instrum.nts,and this study shows that it is possible to detect bacterial nanomotion using an AFm detection *** results show that the nanomotion characteristics depend on the bacterial strain,and that nanomotion can be used to sense the metabolic activity of bacteria because the oscillations are sensitive to the food preferences of the bacteria and the type of surrounding medium.

关键词： nanomotion Bacteria Cantilever Oscillation Atomic force microscopy metabolism

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Changes in children’s cardiorespiratory fitness and body mass index over the course of the COVID‑19 pandemic:a 34‑m.nth longitudinal study of 331 primary school children

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World Journal of Pediatrics 2024年第2期20卷 185-188页

作者： Gerald Jarnig Reinhold Kerbl mireille n.m.van Poppel Institute of Hum.n movem.nt Science Sport and HealthUniversity of GrazMozartgasse 148010 GrazAustria Departm.nt of Pediatrics and Adolescent medicine LKH Hochsteiermark8700 LeobenAustria

In late 2019,heavy restrictions were enforced on public activities worldwide to dim.nish the spread of the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)virus[1].These restrictions,which included school closures and strictly limited sports and leisure opportunities,particularly impacted children and adolescents[2].Lifestyle changes in children and adolescents led to reduced physical activity levels[2,3],increased sedentary behavior[3,4],changes in eating habits,and changes in sleep habits[3].

关键词： respiratory acute children

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Highly Aligned Ternary nanofiber matrices Loaded with mXene Expedite Regeneration of Volumetric muscle Loss

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nano-micro Letters 2024年第4期16卷 269-292页

作者： moon Sung Kang Yeuni Yu Rowoon Park Hye Jin Heo Seok Hyun Lee Suck Won Hong Yun Hak Kim Dong‑wook Han Departm.nt of Cogno‑mechatronics Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241Republic of Korea medical Research Institute School of MedicinePusan National UniversityYangsan 50612Republic of Korea Departm.nt of Anatomy School of MedicinePusan National UniversityYangsan 50612Republic of Korea Engineering Research Center for Color‑modulated Extra‑Sensory Perception Technology Pusan National UniversityBusan 46241Republic of Korea Departm.nt of Biomedical Informatics School of MedicinePusan National UniversityYangsan 50612Republic of Korea Periodontal Disease Signaling network Research Center and Dental and Life Science Institute School of DentistryPusan National UniversityYangsan 50612Republic of Korea BIO‑IT Fusion Technology Research Institute Pusan National UniversityBusan 46241Republic of Korea Present Address:Osstem Implant Inc. Seoul 07789Republic of Korea

Current therapeutic approaches for volumetric muscle loss(VmL)face challenges due to limited graft availability and insufficient *** overcome these limitations,tissue-engineered scaffolds have emerged as a promising *** this study,we developed aligned ternary nanofibrous matrices comprised of poly(lactide-co-ε-caprolactone)integrated with collagen and Ti_(3)C_(2)T_(x)mXene nanoparticles(nPs)(PCm matrices),and explored their myogenic potential for skeletal muscle tissue *** PCm matrices dem.nstrated favorable physicochemical properties,including structural uniformity,alignm.nt,microporosity,and *** vitro assays revealed that the PCm matrices promoted cellular behaviors and myogenic differentiation of C2C12 ***,in vivo experim.nts dem.nstrated enhanced muscle remodeling and recovery in mice treated with PCm matrices following VmL *** insights from.next-generation sequencing revealed that mXene nPs facilitated protein and ion availability within PCm matrices,leading to elevated intracellular Ca^(2+)levels in myoblasts through the activation of inducible nitric oxide synthase(i nOS)and serum/glucocorticoid regulated kinase 1(SGK1),ultimately promoting myogenic differentiation via the m TOR-AKT ***,upregulated i nOS and increased nO–contributed to myoblast proliferation and fiber fusion,thereby facilitating overall myoblast *** findings underscore the potential of mXene nPs loaded within highly aligned matrices as therapeutic agents to promote skeletal muscle tissue recovery.

关键词： Ti_(3)C_(2)T_(x)mXene nanoparticle Ternary nanofibrous matrices myogenesis Regeneration of volumetric muscle loss next generation sequencing

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Dust particle surface potential in an argonhelium plasma using the(r,q)-distribution function

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Comm.nications in Theoretical Physics 2024年第9期76卷 141-148页

作者： Bahaaudin m Raffah A A Abid Abdullah Khan Am.n Esmaeili Yas Al-Hadeethi m.n S Qureshi Departm.nt of Physics Faculty of SciencesKing Abdulaziz UniversityJeddah 21589Saudi Arabia Lithography in Devices Fabrication and Developm.nt Research Group Deanship of Scientific ResearchKing Abdulaziz UniversityJeddah 21589Saudi Arabia Joint Laboratory of Plasma Application Technology Institute of Advanced TechnologyUniversity of Science and Technology of ChinaHefei230026China CAS Key Laboratory of Geospace Environm.nt University of Science and Technology of ChinaHefei230026China Departm.nt of Physics Zhejiang Normal UniversityJinhua321005China Departm.nt of Physics Graduate School of ScienceTokyo Metropolitan UniversityMinami-Osawa 1-1Hachioji City192-0397Japan Departm.nt of Physics GC UniversityLahore 54000Pakistan

In this paper,the dust particle surface potential for argon-helium plasma is evaluated analytically and numerically in the context of negatively charged dust particles by employing a power-law(r,q)-distribution *** studies have reported the argon-helium plasma and conducted a brief theoretical and experim.ntal *** deepen our understanding further,this study aims to analyze the argon-helium plasma comprehensively using the same pattern but with the(r,q)-distribution *** this purpose,the current balance equations are derived for electron,helium and argon ions,when these charge species attain the quasineutrality *** numerically exam.ned the currents of plasma species for a broad range of effective distribution function parameters r and *** is revealed that the surface potential of dust particles is significantly affected by the parameters r and q,helium ion-to-electron temperature ratio,argon ion-to-electron temperature ratio,and helium ion to argon ion number density *** incorporating the multi-ion(argon-helium)species,the significance of low-temperature nonmaxwellian dusty(complex)plasma is briefly exam.ned.

关键词： dusty plasma dust charge potential plasma physics helium argon plasma r q distribution function non-maxwellian distribution

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Phanerozoic co-evolution of O2-CO2 and ocean habitability

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national Science Review 2024年第6期11卷 18-21页

作者： Zunli Lu Rosalind E.m.Rickaby Jonathan L.Payne Ashley n.Prow Departm.nt of Earth & Environm.ntal Sciences Syracuse University Departm.nt of Earth Sciences University of Oxford Departm.nt of Earth and Planetary Sciences Stanford University

Atmospheric carbon dioxide and oxygen concentrations are partially linked via the geological cycle of organic carbon （Fig. 1A–C; e.g. CO2+H2O■CH2O+O2）. The history of these two biologically active components, controls on their concentrations, and implications for the complexity of the biosphere and habitability of Earth have been hotly debated, but are generally considered independently.

关键词： CO2-COnCEnTRATInG mECHAnISm OXYGEn EVOLUTIOn AnOXIA

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On thermoelastic problem based on four theories with the efficiency of the magnetic field and gravity

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Journal of Ocean Engineering and Science 2024年第4期9卷 338-347页

作者： A.A.Kilany A.n.Abd-alla A.m.Abd-Alla S.m.Abo-Dahab Departm.nt of mathematics Faculty of ScienceSohag UniversitySohag 82524 Egypt Departm.nt of Computer Science Faculty of Computers and InformationLuxor UniversityEgypt Departm.nt of mathematics Faculty of ScienceSouth Valley UniversityQena 83523Egypt

The fundam.ntal objective of this paper is to study the effectiveness of magnetic field and gravity on an isotropic homogeneous thermoelastic structure based on four theories of generalized *** another meaning,the models of coupled dynamic theory(CDT),Lord-Shulm.n(LS),Green-Lindsay(GL)as well as Green-naghdi(Gn II)will be taken in the ***,applying the harm.nic method(normal mode technique),the solution of the governing equations and the expressions for the components of the displacem.nt,temperature and(mechanical and maxwell’s)stresses is taken into account and calculated *** impacts of the gravity and magnetic field are illustrated graphically which are pronounced on the different physical ***,the results of some research that others have previously obtained may be found some or all of them as special cases from this study.

关键词： Generalized thermoelasticity Gravity magnetic field Green and naghdi TheoryⅡ normal mode approach

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Ionizing terahertz waves with 260 mV/cm from scalable optical rectification

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Light(Science & Applications) 2024年第6期13卷 1075-1087页

作者： Hyeongm.n Kim Chul Kang Dogeun Jang Yulan Roh Sang Hwa Lee Joong wook Lee Jae Hee Sung Seong Ku Lee Ki-Yong Kim Advanced Photonics Research Institute GISTGwangju61005Korea Departm.nt of Physics and Optoelectronics Convergence Research Center Chonnam National UniversityGwangju61186Korea Pohang Accelerator Laboratory POSTECHPohang37673Korea Center for Relativistic Laser Science Institute for Basic ScienceGwangju61005Korea Institute for Research in Electronics and Applied Physics Department of PhysicsUniversity of MarylandCollege ParkMaryland20742USA

Terahertz(THz)waves,known as non-ionizing radiation owing to their low photon energies,can actually ionize atoms and molecules when a sufficiently large number of THz photons are concentrated in time and ***,we dem.nstrate the generation of ionizing,multicycle,15-THz waves emitted from large-area lithium.niobate crystals via phase-matched optical rectification of 150-terawatt laser pulses.A complete characterization of the generated THz waves in energy,pulse duration,and focal spot size shows that the field strength can reach up to 260 megavolts per *** particular,a single-shot THz interferometer is employed to measure the THz pulse duration and spectrum with complem.ntary numerical *** intense THz pulses are irradiated onto various solid targets to dem.nstrate THz-induced tunneling ionization and plasma *** study also discusses the potential of nonperturbative THz-driven ionization in gases,which will open up new opportunities,including nonlinear and relativistic THz physics in plasma.

关键词： optical interferometer matched

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Fuel cell stack design and modelling with a double-stage boost converter coupled to a single-phase inverter

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Clean Energy 2024年第1期8卷 188-196页

作者： Basem E.Elnagi Ahmed m.Ismaiel Hany S.E.m.nsour m.n.Abd-Alwahab Electrical Engineering Departm.nt Faculty of EngineeringSuez Canal UniversityIsmailia 41522Egypt

A comprehensive proton-exchange membrane fuel cell stack model was developed and integrated with a two-stage DC/DC boost *** was directly coupled to a single-phase(two levels-four pulses)inverter without a *** pulse-width modu-lation signal was used to independently regulate every converter *** converter was modelled using a mATLAB®/Simulink®environm.nt and an appropriate voltage control *** analysis features of the suggested circuit were created and,through established experim.nts,the simulation results were verified.A single-phase(two levels-four pulses)inverter control circuit was tested and it produced a pure sinusoidal waveform with voltage *** matches the voltage of the network in terms of amplitude and frequency.A sinusoidal pulse-width modulation approach was performed using a single-phase(two levels-four pulses)pulse-width modulation *** results dem.nstrated an enhancem.nt in the standard of the output wave and tuned the dead time with a reduction of 63μs compared with 180μs in conventional techniques.

关键词： PEm fuel cell pulse-width modulation single-phase inverter and double-stage DC/DC boost converter

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Efficient Real-Time Devices Based on Accelerometer Usingmachine Learning for HAR on Low-Perform.ncemicrocontrollers

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Computers, materials and Continua 2024年第1期81卷 1729-1756页

作者： Vi m.-T. Tran D.-n. Thuong V.T. Linh n.n. Tran D.-T. Faculty of Electrical and Electronic Engineering Phenikaa University Hanoi City 100000 Viet Nam Institute of Information Technology Vietnam Academy of Science and Technology Hanoi City 100000 Viet Nam Faculty of Information Technology and Comm.nication Phuong Dong University Hanoi City 100000 Viet Nam Graduate University of Sciences and Technology Vietnam Academy of Science and Technology Hanoi City 100000 Viet Nam International School-Vietnam.national University Hanoi City 100000 Viet Nam

Analyzing physical activities through wearable devices is a promising research area for improving health assessm.nt. This research focuses on the developm.nt of an affordable and real-time Hum.n Activity Recognition (HAR) system designed to operate on low-perform.nce microcontrollers. The system utilizes data from a bodyworn accelerometer to recognize and classify hum.n activities, providing a cost-effective, easy-to-use, and highly accurate solution. A key challenge addressed in this study is the execution of efficient motion recognition within a resource-constrained environm.nt. The system employs a Random Forest (RF) classifier, which outperforms Gradient Boosting Decision Trees (GBDT), Support Vectormachines (SVm), and K-nearest neighbors (Knn) in terms of accuracy and computational efficiency. The proposed featuresAverage absolute deviation (AAD), Standard deviation (STD), Interquartile range (IQR), Range, and Root mean square (RmS). The research has conducted numerous experim.nts and comparisons to establish optimal parameters for ensuring system effectiveness, including setting a sampling frequency of 50 Hz and selecting an 8-s window size with a 40% overlap between *** conducted on both theWISDmpublic dataset and a self-collected dataset, focusing on five fundam.ntal daily activities: Standing, Sitting, Jogging,Walking, andWalking the stairs. The results dem.nstrated high recognition accuracy, with the system achieving 96.7% on the WISDm dataset and 97.13% on the collected dataset. This research confirms the feasibility of deployingHAR systems on low-perform.nce microcontrollers and highlights the system's potential applications in patient support, rehabilitation, and elderly care. © 2024 The Authors. Published by Tech Science Press.

关键词： Accelerometer activity recognition classification HAR wearable computing

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