Transition-metal selenides have captured significant research attention as anode materials for sodium ion batteries (SIBs) due to their high theoretical specific capacities and excellent electronic conductivity. However, volumetric expansion inferior cycle life still hinder practical application. Herein, a three-dimensional (3D) ordered macroporous bimetallic (Mn,Fe) selenide modified by carbon layer (denoted 3DOM-MnFeSex@C) composite containing heterojunction interface is fabricated through...

3D orthogonal woven composites are receiving increasing attention with the ever-growing market of composites. A current challenge for these materials' development is how to improve their damage tolerance in and layer-to-layer structures under extreme loads. In this paper, a reduction strategy proposed by combining structural electromagnetic properties. An integrated experimental platform designed power system, drop-testing machine, data acquisition devices investigate effects pulse impact...

Establishing scaling laws for amorphous alloys is of critical importance describing their mechanical behavior at different size scales. In this paper, taking Ni2Ta metallic alloy as a prototype materials system, we derive the law impact resistance alloys. We use laser-induced supersonic micro-ballistic experiments to measure first time size-dependent response also report results molecular dynamics (MD) simulations same system but much smaller Comparing these results, determined both length...

Abstract In design of superconducting systems, type-II superconductors are tasked with carrying a transport current while typically operating in the presence an external magnetic field. When exposed to unexpected perturbations, these systems will be susceptible instabilities, mainly manifesting as flux jump and quench. These two phenomena can occur simultaneously or sequentially, one potentially triggering other. this paper, we build comprehensive electromagnetic-thermal-mechanical coupling...

Recently, the application of high-Tc superconductors with longitudinal geometry to linear bearings and transportation devices has reached a higher stage development. For these maglev systems, static stability already been established; but dynamic is still under investigation, since systems have multiple degrees freedom their dynamics are coupled intricate superconducting phenomena. In this paper, in terms Newton's second law, thermal diffusion equation, Maxwell's equations together nonlinear...

In high-temperature superconducting magnets, slow quench propagation of YBa2Cu3O7−δ coils makes the time delay detection signal and active protection, resulting in local heat accumulation further coil degradation accompanied by strong mechanical response. Based on Maxwell's equations, conduction equation, basic equations elasticity, we build theoretically validate a two-dimensional axisymmetric electro-thermal-mechanical model for an insulated pancake with real dimensions this work. Such has...

For a maglev system, vertical and lateral displacements of the levitation body may simultaneously occur under external disturbances, which often results in changes guidance forces even causes some serious malfunctions. To fully understand effect disturbances on performance, this work, we build two-dimensional numerical model basis Newton's second law motion mathematical formulation derived from magnetoquasistatic Maxwell's equations together with nonlinear constitutive relation between...

This paper presents an investigation on the AC losses in several typical superconducting composite conductors using H-formulation model. A single strip with ferromagnetic substrate or cores and a stack of coated substrates are studied. We consider all carrying transport currents simultaneously exposed to perpendicular magnetic fields. The influences amplitude, frequency, phase difference materials investigated. results show that magnetization stacked strips have similar characteristics. can...

Silica aerogels have incomparable advantages among thermal insulation materials because of their ultralow density and conductivity, but cumbersome production processes, high cost, low mechanical stability limit practical application. In this study, a novel aqueous process to prepare lightweight aerogel-like silica foams (ASFoams) through the cast-in situ method ambient pressure drying was proposed with multiblock polyurethane surfactant as vesicle template. ASFoams possess unique loose...

We investigate the optical gradient force in 2D hybrid and plasmonic waveguides. By comparing with conventional dielectric waveguides, we show that can be enhanced by at least 1 order of magnitude waveguides due to strongly fields waveguide surfaces. compare coupled different geometries, including rectangular, circular, triangular cross sections find rectangular provide strongest force. also enhancement is nonresonant thus used for a broad range wavelengths.

Soft ferromagnets are widely used as flux-concentration materials in the design of guideways for superconducting magnetic levitation transport systems. In order to fully understand influence soft on performance, this work we apply a numerical model based functional minimization method and Bean's critical state study properties an infinitely long superconductor immersed field created by guideway different sets parallel permanent magnets with between them. The force, guidance stiffness pole...

Abstract It has been a key issue for photovoltaic (PV) cells to survive under mechanical impacts by tiny dust. In this paper, the performance degradation and damage behavior of PV subjected massive dust impact are investigated using laser-shock driven particle experiments modeling. The results show that light-electricity conversion efficiency decreases with increasing velocity particles’ number density. drops from 26.7 3.9% 40 185 m/s densities 35 150/mm 2 , showing reduction up 85.7% when...

We demonstrate a chip-scale compact, broadband polarization rotator on silicon substrate. Unlike previously demonstrated waveguide rotators, our approach relies the adiabatic mode evolution in single horizontal slot-waveguide, which results simple design and one-mask fabrication process.The structure is designed to rotate TM-polarized input by 90 degree while be transparent with TE-polarized input. The fabricated device has total length of 100μm. Transmission spectra show average extinction...

The magneto-elastic problem of a thin superconducting disk in perpendicular magnetic field is analyzed with field-dependent critical current. We calculate numerically the body force distribution and discuss dependence Jc on behavior during ascent descent for three state models: Bean, Kim, exponential models. results show that when considering Jc, flux remagnetization fronts have larger moving speed towards center relative to Bean model. Simultaneously, most dangerous stage possible cracking...

To improve the mechanical properties of high temperature superconductors due to intrinsic brittleness and defects is a central problem for application superconductors. This paper presents an analysis behavior finite cylindrical type-II containing ellipsoidal cavity in applied magnetic field. After Bean's critical state model method minimum energy variation are employed, dependences magnetoelastic behaviors on sizes superconducting sample obtained. The results display that induced current...