Article
Physics, Applied
V. A. Shalygin, R. B. Adamov, M. Ya Vinnichenko, M. D. Moldavskaya, D. A. Firsov
Summary: Investigation into the far-infrared transmission in silicon carbide of 6H polytype reveals that the lifetimes of folded transverse acoustic phonons increase more than six times as the temperature decreases, while the oscillator strengths remain constant.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Forestry
Liamara Santos Masullo, Alexandre de Vicente Ferraz, Jose Henrique Tertulino Rocha, Gabriel de Castilho Valdo, Patricia Andressa de Avila, Antonio Leite Florentino, Fabio Henrique Silva Floriano de Toledo, Luis Reynaldo Ferracciu Alleoni, Jose Leonardo de Moraes Goncalves
Summary: This study assessed the soil Cu and Zn pools in a cultivated Eucalyptus grandis plantation in Brazil and evaluated the effects of mineral Cu and Zn fertilization on soil nutrient fractionation. The results showed no differences in nutritional status of trees despite absence of Cu and Zn fertilizers and removal of harvest residues. Foliar Cu concentration was positively correlated with soil Cu content, while foliar Zn concentration was positively correlated with soil Zn content.
FOREST ECOLOGY AND MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
C. F. Majkrzak, N. F. Berk, B. B. Maranville, J. A. Dura, T. Jach
Summary: In the analysis of neutron scattering measurements, it is typically sufficient to treat the incident and scattered neutron beams as incoherent distributions of plane waves. However, for some cases, such as specular neutron reflectometry, a localized wave packet is required to describe the individual neutron's wavefunction. This study demonstrates how neutron diffraction patterns can be accurately described by associating an individual neutron with a wave packet in these cases, and illustrates the importance of considering the transverse spatial extent of the neutron wavefront.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2022)
Article
Multidisciplinary Sciences
Heda Zhang, Jahyun Koo, Chunqiang Xu, Milos Sretenovic, Binghai Yan, Xianglin Ke
Summary: This study discovers that kagome metal TbMn6Sn6 is a ferrimagnetic topological Dirac material and observes its asymmetrical anomalous Nernst effect and anomalous thermal Hall effect. First-principles calculations demonstrate that the anomalous transverse transport is consistent with the Berry curvature contribution from the massive Dirac gaps in the 3D momentum space. Additionally, the transverse thermoelectric transport exhibits an exchange-bias behavior with respect to the applied magnetic field.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Yujuan Wu, Shishuo Liu, Qingmei Xie, Zhaofei Chen, Zhangxiong Zi, Jun Cai, Jinjun Feng
Summary: This letter investigates the influence of the asymmetric C-magnet on the beam transmission of a travelling wave tube (TWT) and proposes a magnetic pole piece with an arc slot to effectively reduce the transverse magnetic field. Experimental results show that this magnetic structure improves the performance of TWTs.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Mathematics, Applied
Lorenzo Valvo, Andrea Carati
Summary: This paper discusses the results of molecular dynamics simulations for a magnetized one component plasma, with the aim of estimating the diffusion coefficient in the plane perpendicular to the magnetic field. The authors find that there is a threshold in terms of the magnetic field strength: for weak fields, the diffusion coefficients scale as 1/magnetic field strength squared, while a slower decay is observed at high field strength. The relationship between this transition and the mixing properties of the microscopic dynamics is investigated by analyzing the behavior of velocity autocorrelation.
Article
Optics
Olena Benavides, Lelio de la Cruz May, Aaron Flores Gil, Efrain Mejia Beltran
Summary: This study investigated the hemispherical reflectivity of niobium using solid-state lasers with a 50 ns pulse duration in a Q-switched mode at wavelengths of 1.06μm and 0.69μm. The experiment found that the reflectivity of niobium decreases as the laser fluence increases towards the plasma formation threshold, due to changes in the surface absorptivity caused by plasma formation. The study also observed a significant effect of laser wavelength on the reflectivity values at low laser fluence.
Article
Materials Science, Multidisciplinary
Kook Tae Kim, Dong-Ok Kim, Jung Yun Kee, Ilwan Seo, Yongseong Choi, Jun Woo Choi, Dong Ryeol Lee
Summary: The study investigates the induced Pt magnetization in a Pt/Co/Pt thin film structure and characterizes the Pt structural and magnetic properties using synchrotron-based resonant x-ray reflectivity and x-ray resonant magnetic reflectivity measurements. An advanced Bayesian inference analysis method is utilized to extract material parameters from the data. Significant differences in Pt magnetization and Co-Pt interfacial roughness are observed between the top and bottom Pt layers, with higher values in the top Pt layer.
CURRENT APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Niranjan Kumar, Aleksey V. Nezhdanov, Sergey A. Garakhin, Ruslan M. Smertin, Pavel A. Yunin, Vladimir N. Polkovnikov, Nikolay I. Chkhalo, Aleksandr I. Mashin
Summary: The physical properties and stress analysis of Si layers embedded in bi-layer periodic Mo/Si and W/Si multilayer mirrors were investigated by Raman scattering. It was found that the alternate Si layers in these multilayers were in the amorphous phase, with the TO phonon mode shifting and linewidth changing with thickness and thermal annealing. The reduction of period thickness in thermally annealed multilayers led to changes in the reflection properties of mirrors.
SURFACES AND INTERFACES
(2021)
Article
Physics, Applied
T. Genieys, M. N. Petrakakis, G. D. Tsibidis, M. Sentis, O. Uteza
Summary: The optical response of nickel under ultrashort laser irradiation is investigated over a wide range of fluence and pulse duration. It is found that the reflectivity remains stable at the ablation threshold, but is dominated by fast-thermalized free electrons at higher laser fluences. This study provides insight into the electron collision rate as a key parameter for laser-matter interaction.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Raghunandan B. Iyer, Yilong Luan, Ruth Shinar, Joseph Shinar, Zhe Fei
Summary: This study investigates exciton-plasmon polaritons in WSe2/Au heterostructures using scattering-type scanning near-field optical microscopy (s-SNOM). The dispersion diagram of the polaritons is constructed by mapping the interference fringes at different excitation energies, showing strong exciton-plasmon coupling. The polariton wavelength is found to be sensitive to the thickness of WSe2, with a drastic decrease below 40 nm.
Article
Physics, Applied
Ken-ichi Uchida, Weinan Zhou, Yuya Sakuraba
Summary: The transverse thermoelectric effect involves the conversion of a temperature gradient into a transverse charge current in a magnetic field or magnetic material, or vice versa. The anomalous Nernst effect in magnetic materials has gained attention for its potential applications in fundamental physics and thermoelectricity. Recent progress has been made in utilizing magnetic materials for transverse thermoelectric generation, with the potential to advance thermal energy harvesting and heat-flux sensing technologies.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Haiyuan Zou, Yi Cui, Xiao Wang, Z. Zhang, J. Yang, G. Xu, A. Okutani, M. Hagiwara, M. Matsuda, G. Wang, Giuseppe Mussardo, K. Hodsagi, M. Kormos, Zhangzhen He, S. Kimura, Rong Yu, Weiqiang Yu, Jie Ma, Jianda Wu
Summary: The study presents V-51 NMR and inelastic neutron scattering (INS) measurements on the quasi-1D antiferromagnet BaCo2V2O8 under transverse field. It reveals a 1D quantum critical point (QCP) at H-c(1D) approximately 4.7 T and provides an unambiguous experimental realization of the massive E-8 phase in the compound. The results offer a new experimental route for exploring the dynamics of quantum integrable systems and physics beyond integrability.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Harsh Bhatt, Yogesh Kumar, Champa Lal Prajapat, Christy J. Kinane, Andrew Caruana, Sean Langridge, Saibal Basu, Surendra Singh
Summary: The effect of stacking sequence on magnetic and superconducting properties, and the resulting magnetic proximity effect (MPE), was investigated in LSMO/YBCO and LSMO/SrTiO3/YBCO heterostructures using spin-polarized neutron reflectivity experiments. The results showed that the stacking sequence influenced the superconducting transition temperature and magnetization in the heterostructures. The thickness of the MPE-induced magnetic depleted layer was found to decrease at higher superconducting transition temperatures. The study suggests that tuning the strength of MPE in oxide heterostructures may offer a promising platform for device realization.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Ruodong Zhi, Biao Liu, Gang Lv, Leilei Cui, Tong Zhou
Summary: This article proposes a novel transverse flux linear synchronous motor integrated with propulsion, levitation, and guidance functions (PLG). The structure and principle of the motor are discussed, and the air-gap magnetic flux density, propulsion, levitation, and guidance forces are calculated. The calculated results are also validated by experiments, providing electromagnetic theory analysis for electromagnetic suspension transportation integrated with PLG.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Mechanics
Gholamreza Kefayati, Ali Tolooiyan, Andrew P. Bassom, Kambiz Vafai
Summary: This study introduces a mesoscopic method based on the lattice Boltzmann method for investigating the behavior of non-Newtonian fluids in porous media. By modeling power-law fluids in different REV models of porous media, a general mesoscopic model for both two- and three-dimensional cases was developed, and successfully used to simulate natural convection and double-diffusive natural convection in porous media.
Article
Mathematics, Applied
Madeleine Cockerill, Andrew P. Bassom, Lawrence K. Forbes
Summary: The equations of motion for fluid flow in a shallow circular ocean centred at the North Pole are considered, revealing two families of exact closed-form solutions. One set of solutions can be expressed in terms of associated Legendre functions while the other can be written in simple algebraic form.
APPLIED MATHEMATICS LETTERS
(2021)
Article
Astronomy & Astrophysics
Madeleine Cockerill, Andrew P. Bassom, Andrew J. Willmott
Summary: This study examines the properties of freely propagating barotropic Rossby waves in a circular polar cap, using linearised shallow water equations to derive an amplitude equation for the waves. The coefficients of the amplitude equation depend on the topography of the basin, but the properties of the waves are shown to be not particularly sensitive to the precise details of the underlying topography.
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS
(2022)
Article
Engineering, Multidisciplinary
J. A. Leach, Andrew P. Bassom
Summary: The evolution of solutions of a class of scalar nonlinear hyperbolic reaction-diffusion equations with relaxation time and monostable cubic reaction function was studied. It was found that the large-time structure of the solution is determined by the evolution of a propagating wave-front, which can take one of three forms depending on the specific values of the problem parameters.
JOURNAL OF ENGINEERING MATHEMATICS
(2021)
Article
Mechanics
Ciprian D. Coman, Andrew P. Bassom
Summary: In this paper, we revisit the bifurcation problem of an axially compressed thin elastic circular cylinder, taking into account the nonlinear pre-buckling bending deformations. By using suitable scaling arguments and singular perturbation methods, we explore the connection with the more widely studied classical cases and confirm our novel theoretical results through direct numerical simulations.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2022)
Article
Physics, Applied
I. R. Hooper
Summary: This study demonstrates that increasing the light-matter interaction for millimeter waves using diffractively coupled waveguide modes significantly improves the photomodulation efficiency by more than two orders of magnitude, while maintaining the switching speed of the bare wafer.
PHYSICAL REVIEW APPLIED
(2022)
Article
Mechanics
J. M. Floryan, W. Wang, S. Panday, Andrew P. Bassom
Summary: The study of laminar natural convection in an infinite vertical slot with a corrugated profile and different heating profiles shows that the interaction between heating and topography patterns results in diverse fluid flow effects. The addition of grooves to an isothermal plate reduces vertical fluid flow and increases transverse heat flow, while sinusoidal heating generates counter-rotating rolls without net vertical flow. The combination of corrugation and periodic heating leads to various flow patterns, with the details controlled by a pattern interaction effect dictated by the relative positions of the heating and corrugation patterns.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Geochemistry & Geophysics
S. G. Meyer, A. M. Reading, A. P. Bassom
Summary: This study applies unsupervised techniques to analyze large-scale mine microseismic network data using Self-Organizing Maps (SOM), demonstrating the effectiveness of machine learning in expediting signal classification and analysis. By extracting waveform features and utilizing standard and weighted SOM variants, signals can be rapidly classified and prioritized for further processing, providing practical benefits and insights into underlying event mechanisms.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Mechanics
J. M. Floryan, A. Baayoun, S. Panday, Andrew P. Bassom
Summary: This study analyzes the laminar natural convection in inclined slots subjected to patterned heating. The results show that periodic heating applied at the lower plate generates net upward flow when the slot is tilted, while periodic heating applied at the upper plate produces net downward flow in the inclined situation. Addition of uniform heating promotes upward flow, while cooling has the opposite effect. There is a critical inclination angle where the maximum net flow rate is greatest.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Physics, Applied
I. R. Hooper, E. Khorani, X. Romain, L. E. Barr, T. Niewelt, S. Saxena, A. Wratten, N. E. Grant, J. D. Murphy, E. Hendry
Summary: In this paper, a new type of silicon-based metamaterial with a tunable electron-hole lifetime is designed, achieved by periodically patterning a dielectric surface passivation layer. The application of these metamaterials as photomodulators is investigated, with switching times depending on photoexcitation intensity, wafer thickness, and carrier lifetime.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Mechanics
J. M. Floryan, W. Wang, Andrew P. Bassom
Summary: This study investigates the role of patterned heating in reducing pressure losses in vertical conduits. The heating generates flow separation structures, which limit the frictional resistance by reducing the contact between the stream and the sidewalls. It also modifies the temperature field, inducing a net buoyancy force that can either assist or oppose the pressure gradient required for maintaining a fixed flow rate. The system response depends on the spatial distribution and intensity of the heating, as well as the flow Reynolds number and fluid Prandtl number. Carefully chosen wall heating patterns can have a significant impact on the system response.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Mathematics, Applied
Madeleine C. Cockerill, Lawrence K. Forbes, Andrew P. Bassom
Summary: We study the long-term evolution of an axisymmetric bubble and explore its possible development. Through linearized inviscid analysis, we predict the stability of the bubble under small disturbances, while a nonlinear inviscid extension reveals that the growth of unstable modes is ultimately limited by the formation of axisymmetric curvature singularities. The addition of surface tension delays but does not entirely prevent these singularities. Our results show good agreement with a viscous Boussinesq theory, especially at early times. The inclusion of viscosity allows for a wide range of possible large-scale deformations, with the most exotic being jet-like structures that can pinch off and break into distinct parts. Spectral methods are used to solve the inviscid and Boussinesq models, while the linearized inviscid model admits a closed-form series solution.
QUARTERLY JOURNAL OF MECHANICS AND APPLIED MATHEMATICS
(2023)
Article
Mathematics, Applied
Andrew Bassom, Phil Howlett, Peter Taylor
Summary: This study proposes and justifies an explicit Maclaurin series solution for a classic non-autonomous abstract evolution equation involving bounded linear operators on Banach space.
APPLIED MATHEMATICS LETTERS
(2023)
Article
Mechanics
J. M. Floryan, N. N. Haq, Andrew P. Bassom
Summary: This study conducts an asymptotic analysis on the effect of surface vibrations in mitigating resistance in a fluid system. The results reveal the intricacies of the phenomena at work and describe their interplay. The findings suggest that high-frequency small vibrations can significantly reduce resistance, with the effect depending on the wavelength of the vibrations. This research is important for understanding fluid systems in both biological and technological contexts.
EUROPEAN JOURNAL OF MECHANICS B-FLUIDS
(2023)
Article
Engineering, Electrical & Electronic
Michal Mrnka, Ian R. Hooper, Harry Penketh, David B. Phillips, Euan Hendry
Summary: This paper presents a new design concept of dual-band spaceplate, which can simultaneously operate in two different frequency bands, enabling better utilization of spectral bandwidth. The design uses a multilayer stack of semitransparent mirrors separated by free-space voids to emulate the effect of free-space propagation, and the frequency separation can be adjusted to achieve different frequency bands.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
