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Computer Simulation of Effect of Intergrain Exchange Interaction on Magnetic Properties of Nanocomposite Magnets

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Journal of Rare Earths 2004年第1期22卷 146-151页

作者： Fukunaga h Mukaino h Department of Electrical Engineering & Electronics Graduate School of Science & Technology Nagasaki University Nagasaki 852-8521 Japan Nagasaki University Nagasaki 852-8521 Japan

Effects of the intergrain exchange interaction on magnetic properties of nanocomposite magnets were investigated by using the computer simulation based on the micromagnetic theory. The simulation was carried out under the assumptions that the strength of the intergrain exchange interaction is weaker than that of the intragrain exchange interaction, that inhomogeneous nanostructures result in the distribution of the strength of the intergrain exchange interaction, and that there exists nonmagnetic intergranular phase (NMIP) between grain boundaries. The distribution of the strength of the intergrain exchange interaction was simulated by the lognormal distribution with the standard deviation of σ.The calculations for Nd 2Fe 14B/α-Fe nanocomposite magnets reveal that a suitably weak intergrain exchange interaction and small grain size enable us to improve magnetic properties. It is also found that a Nd 2Fe 14B/α-Fe nanocomposite magnet has a potential of a (Bh) max value exceeding 300 kJ·m -3. On the other hand, the calculations for Nd 2Fe 14B/Fe 3B nanocomposite magnets reveal that the distribution of the strength of the intergrain exchange interaction deteriorates magnetic properties significantly. Particularly, this tendency is remarkable, when the grain size L is larger than its optimum value, 11 nm. The existence of nonmagnetic boundary layers accelerats this tendency. At σ=0.2, the calculated demagnetization curve for the model magnet composed of Nd 2Fe 14B(36%)/Fe 3B(54%)/NMIP(10%) (Valume fraction) grains (L=15 nm) agrees with that obtained experimentally for a Nd 2Fe 14B/Fe 3B nanocomposite magnet. These results suggest importance of refinement of grain size, suppression of a nonmagnetic intergranular phase, and preparation of homogeneous nanostructure for superior magnetic properties.

关键词： metal materials nanocomposite magnet exchange interaction nanostructure remanence intergranular phase

Critical Concentration of Zinc for Increasing Production and Quality of Mangosteen Fruit in West Sumatera, Indonesia

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Phyton-International Journal of Experimental Botany 2024年第11期93卷 2767-2786页

作者： Martias Dewi Fatria Adha Fatmah Siregar Raden heru Praptana Antonius Kasno Muhammad Prama Yufdy Riska Ni Luh Putu Indriyani Affandi Tri Budiyanti Sri hadiati Ellina Mansyah Irwan Muas Jumjunidang mizu Istianto Djoko Mulyono Intan Gilang Cempaka Triyani Dewi Agus Supriyo Bambang Nuryanto West Sumatera Mangosteen Association Department of PlantationFood Crops and Horticulture West SumateraPadang25157Indonesia Indonesian Agency for Agricultural Instrument Standardization Jakarta12540Indonesia Research Center for Food Crops National Research and Innovation AgencyBogor16911Indonesia Research Center for horticulture National Research and Innovation AgencyBogor16915Indonesia

West Sumatera is one of the largest mangosteen production centers in *** the 2019 harvest season,there were variations in fruit production and quality which indicated symptoms of zinc(Zn)deﬁ*** study evaluates the status of Zn for increasing the production and quality of mangosteen fruit Ratu Kamang *** study was conducting using the observation method in Lima Puluh Kota,West Sumatera from January to December *** study used ten mangosteen trees aged 23 years in three locations selected *** observed included soil properties,leaf nutrients,number of fruits;fruit,rind,aril and seed weights,percentage of fruit scars(FS)and percentage of fruit contaminated with yellow sap(YSC).The relationship between Zn concentration in leaves and fruit production and quality was analyzed using Pearson’s correlation and regression *** results showed that Zn played a role in increasing the production and quality of man-gosteen fruit at certain concentration ranges in the *** concentrations of 23.45–30.00 mg/kg play a role in increasing production,while Zn concentrations of 26.29–30.29 mg/kg play a role in increasing *** lowest incidence of FS and YSC was found in trees with Zn concentration in the leaves between 30.00–32.00 mg/*** concentration in the leaves of 30.00 mg/kg was the critical concentration in increasing the production and quality of mangosteen fruit under local cultivation *** has an antagonistic relationship to iron(Fe)and cop-per(Cu)in leaf tissue.

关键词： Mangosteen fruit fertilizer management fruit grade production level of zinc

A simple tight-binding approach to topological superconductivity in monolayer MoS2

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Chinese Physics B 2020年第2期29卷 425-431页

作者： h Simchi Department of Physics Iran University of Science and TechnologyNarmakTehran 16844Iran Iran Semicondutor Technology Center Tehran 19575-199Iran

Monolayer molybdenum disulfide(MoS2)has a honeycomb crystal ***,with considering the triangular sublattice of molybdenum atoms,a simple tight-binding hamiltonian is introduced(derived)for studying the phase transition and topological superconductivity in MoS2 under uniaxial *** is shown that spin-singlet p+ip wave phase is a topological superconducting phase with nonzero Chern *** the chemical potential is greater(smaller)than the spin-orbit coupling(SOC)strength,the Chern number is equal to four(two)and otherwise it is equal to ***,the results show that,if the superconductivity energy gap is smaller than the SOC strength and the chemical potential is greater than the SOC strength,the zero energy Majorana states ***,we show that the topological superconducting phase is preserved under uniaxial strain.

关键词： MoS2 topological superconductivity Chern number band inversion

Peristaltic flow of Johnson-Segalman fluid in asymmetric channel with convective boundary conditions

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Applied Mathematics and Mechanics(English Edition) 2014年第6期35卷 697-716页

作者： h.YASMIN T.hAYAT A.ALSAEDI h.h.ALSULAMI Department of Mathematics Quaid-i-Azam University Nonlinear Analysis and Applied Mathematics (NAAM) Research Group Faculty of Science King Abdulaziz University

This work is concerned with the peristaltic transport of the Johnson-Segalman fluid in an asymmetric channel with convective boundary conditions. The mathematical modeling is based upon the conservation laws of mass, linear momentum, and energy. The resulting equations are solved after long wavelength and low Reynolds number are used. The results for the axial pressure gradient, velocity, and temperature profiles are obtained for small Weissenberg number. The expressions of the pressure gra-dient, velocity, and temperature are analyzed for various embedded parameters. Pumping and trapping phenomena are also explored.

关键词： asymmetric channel convective condition pumping and trapping Johnson-Segalman fluid

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第十四届全国儿童消化系统疾病学术会议纪要

中华儿科杂志 2023年第11期61卷 1055-1056页

作者：郑伟江逊江米足浙江大学医学院附属儿童医院消化科、国家儿童健康与疾病临床医学研究中心、国家儿童区域医疗中心杭州310052 空军军医大学第二附属医院儿科西安710038 浙江大学医学院附属儿童医院消化科和儿童内镜中心、国家儿童健康与疾病临床医学研究中心、国家儿童区域医疗中心杭州310052

第十四届全国儿童消化系统疾病学术会议于2023年8月3至5日在贵州省贵阳市召开。本次会议有力地推动了全国儿科消化系统疾病诊治水平和基础研究水平的提高。

关键词：消化系统疾病贵州省贵阳市学术会议纪要基础研究水平全国

Non-relativistic scattering amplitude for a new multi-parameter exponential-type potential

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Chinese Physics B 2016年第8期25卷 21-25页

作者： Yazarloo B h Mehraban h hassanabadi h Physics Department Semnan University Physics Department Shahrood University of Technology

In this paper, we study the scattering properties of s-wave Schrdinger equation for the multi-parameter potential,which can be reduced into four special cases for different values of potential parameters, i.e., hulthn, Manning–Rosen,and Eckart potentials. We also obtain and investigate the scattering amplitudes of these special cases. Some numerical results are also obtained and reported.

关键词： scattering amplitude Schrodinger equation multi-parameter potential phase shifts cross section

Leveraging ROTI map derived from Indonesian GNSS receiver network for advancing study of Equatorial Plasma Bubble in Southeast/East Asia

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Earth and Planetary Physics 2025年第1期9卷 101-116页

作者： Prayitno Abadi Ihsan N.Muafiry Teguh N.Pratama Angga Y.Putra Suraina Gatot h.Pramono Sidik T.Wibowo Febrylian F.Chabibi Umar A.Ahmad Wildan P.Tresna Asnawi Research Center for Climate and Atmosphere Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia School of Electrical Engineering Telkom UniversityBandungIndonesia Directorate of Laboratory Management Facilities and Science and Technology Park Indonesian National Research and Innovation Agency(BRIN)PontianakIndonesia Geophysics Laboratory Master Program in PhysicsUniversitas Gadjah Mada(UGM)YogyakartaIndonesia Research Center for Space Indonesian National Research and Innovation Agency(BRIN)BandungIndonesia Indonesian Geospatial Information Agency(BIG) JakartaIndonesia Research Center for Photonics Indonesian National Research and Innovation Agency(BRIN)Tangerang SelatanIndonesia Department of Earth and Planetary Sciences Hokkaido UniversitySapporoJapan

This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning *** by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude ***-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast *** provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this *** generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific *** preliminary findings from the ROTI maps of Ina-CORS are ***,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther ***,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East *** have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,*** observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities *** sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionosphe

关键词： Equatorial Plasma Bubble(EPB) GNSS receivers’network Indonesia Continuously Operating Reference Station(Ina-CORS) ionospheric map Rate of TEC change index(ROTI)map

Photocurrent improvement of an ultra-thin silicon solar cell using the localized surface plasmonic effect of clustering nanoparticles

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Chinese Physics B 2020年第6期29卷 532-537页

作者： F Sobhani h heidarzadeh h Bahador Department of Electrical and Computer Engineering University of Mohaghegh ArdabiliArdabilIran

The cluster-shaped plasmonic nanostructures are used to manage the incident light inside an ultra-thin silicon solar *** we simulate spherical,conical,pyramidal,and cylindrical nanoparticles in a form of a cluster at the rear side of a thin silicon cell,using the finite difference time domain(FDTD)*** calculating the optical absorption and hence the photocurrent,it is shown that the clustering of nanoparticles significantly improves *** photocurrent enhancement is the result of the plasmonic effects of clustering the *** comparison,first a cell with a single nanoparticle at the rear side is *** four smaller nanoparticles are put around it to make a *** photocurrents of 20.478 mA/cm2,23.186 mA/cm2,21.427 mA/cm2,and 21.243 mA/cm2 are obtained for the cells using clustering conical,spherical,pyramidal,cylindrical NPs at the backside,*** values are 13.987 mA/cm2,16.901 mA/cm2,16.507 mA/cm2,17.926 mA/cm2 for the cell with one conical,spherical,pyramidal,cylindrical NPs at the backside,***,clustering can significantly improve the ***,the distribution of the electric field and the generation rate for the proposed structures are calculated.

关键词： clustering nanoparticles plasmonic solar cell localized surface plasmon resonance photocurrent finite difference time domain(FDTD)method light management

Gaussian process hydrodynamics

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Applied Mathematics and Mechanics(English Edition) 2023年第7期44卷 1175-1198页

作者： h.OWhADI California Institute of Technology MC 9-94PasadenaCA 91125U.S.A.

We present a Gaussian process(GP)approach,called Gaussian process hydrodynamics(GPh)for approximating the solution to the Euler and Navier-Stokes(NS)*** to smoothed particle hydrodynamics(SPh),GPh is a Lagrangian particle-based approach that involves the tracking of a finite number of particles transported by a ***,these particles do not represent mollified particles of matter but carry discrete/partial information about the continuous *** is achieved by placing a divergence-free GP priorξon the velocity field and conditioning it on the vorticity at the particle *** physics(e.g.,the Richardson cascade and velocityincrement power laws)is incorporated into the GP prior by using physics-informed additive *** is equivalent to expressingξas a sum of independent GPsξl,which we call modes,acting at different scales(each modeξlself-activates to represent the formation of eddies at the corresponding scales).This approach enables a quantitative analysis of the Richardson cascade through the analysis of the activation of these modes,and enables us to analyze coarse-grain turbulence statistically rather than *** GPh is formulated by using the vorticity equations,it does not require solving a pressure *** enforcing incompressibility and fluid-structure boundary conditions through the selection of a kernel,GPh requires significantly fewer particles than *** GPh has a natural probabilistic interpretation,the numerical results come with uncertainty estimates,enabling their incorporation into an uncertainty quantification(UQ)pipeline and adding/removing particles(quanta of information)in an adapted *** proposed approach is suitable for analysis because it inherits the complexity of state-of-the-art solvers for dense kernel matrices and results in a natural definition of turbulence as information *** experiments support the importance of selecting physics-informed kernels and

关键词： I Navier-Stokes(NS)equation Euler Lagrangian vorticity Gaussian pro-cess(GP) physics-informed kernel