Materials Literature
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Micro-structured metallic devices are used extensively to control the transmission and absorption of electromagnetic waves in the optical, infrared, THz, and microwave domains. The simplest geometry of this class consists of arrays of metal strips printed on a dielectric substrate. The combination of two closely space…
In this paper the effective properties of a perpendicularly magnetized magnonic crystal are theoretically studied. The magnonic crystal is a two-dimensional antidot lattice composed by circular holes embedded into a ferromagnetic film. Both the periodicity of the magnonic crystal and the diameter of the holes are in t…
Short circuits between sheets of magnetic core of electrical machines in service are due to inter-laminar insulation damage, manufacturing defects, edge burrs and winding faults. These inter-laminar faults lead to circulating eddy currents between the affected laminations which are larger than seen in normal operation…
We show that PT-symmetry concepts, combined with an effective nonlocal response, allow realizing all-angle negative refraction and aberration-free optical imaging. The designed PT-symmetric lens is an example of “absolute optical instrument”, with similar imaging properties as DNG lenses, but without some of their dra…
We find scattering cancellation in diffusive transport of acoustics waves propagating through strongly scattering media and for ballistic sound in the long wavelength limit.
Width-modulated dynamic magnonic crystal is developed. It utilizes a spin-wave waveguide fabricated from a single-crystal Yttrium Iron Garnet film and two conducting wires attached to the film surface between modulated and unmodulated areas. Application of electric currents to the wires produces Oersted fields that pr…
Directional and circularly polarised emission from quantum dots coupled with chiral Ag nanostructures has been demonstrated. Semiconductor quantum dots were deposited onto the chiral structures using the Layer-by-Layer deposition technique. Time-resolved photoluminescence measurements demonstrated a lifetime quenching…
The relationship between the empirical parameters of the Havriliak–Negami formula with the physical characteristics of metal nanostructured composites is discussed. The analysis is based on a non-phenomenological theory of the complex permittivity of these materials. It turns out that the absolute values and temperatu…
Recent scientific advances in total or partial reflection (band gaps due to periodicity) and invisibility (artificial anisotropy via transformation physics) for elastic waves, as well as wave magnitude damping (using Helmholtz resonators), open new avenues in seismic metamaterials.
In this paper it is theoretically shown that in ferromagnetic films with in-plane magnetization there exist magnetic waves characterized by a “negative” group velocity. The group velocity is anti-parallel to the phase velocity and to the propagation in-plane wave vector placed along the direction of the static magneti…
This article is devoted to studying the kinetics of formation of individual nanoparticles of noble metals and composites based on them. The effect of the concentration of the reducing agent and temperature on the rate of formation of nanoparticles of noble metals is studied. In order to characterize the morphology, ph…
Electrical and optical phenomena in the process of combustion of heterogeneous energetic condensed systems (ECSs) of the (Zr + CuO + LiF)–(Zr + BaCrO4 + LiF) type that represent the model of a high-temperature electrochemical cell (HEC) are experimentally investigated. It is found that combustion of the systems studie…
A method for describing the creep behavior until fracture of a highly filled polymer material previously damaged in preliminary tests is proposed. The constitutive relations are the relations of nonlinear endochronic theory of aging viscoelastic materials (NETAVEM) [1]. The numerical-graphical method for identifying t…
The high-temperature heat capacity of YbVO 4 in the range 381–1054 K has been measured by differential scanning calorimetry for the first time, and thermodynamic functions of the solid compound—changes in enthalpy and entropy, reduced Gibbs energy—have been determined using this data.
The direct impact of a lightning strike at electrical systems and living beings can lead to destruction of system elements, equipment and eventually death. The resulting magnitude of voltage and current can be attenuated or amplified, due to the reflection process of their waves in points of the system where there is…
Przedmiotem badań była analiza wpływu parametrów procesu zrobotyzowanego napawania GMA drutem rdzeniowym EnDOtec DO48 o średnicy 1,6 mm powierzchni roboczych krzywek przesiewacza koksu ze stali trudnościeralnej HTK 900H na jakość, kształt i odporność na zużycie ścierne napoin. Próby napawania prowadzono z zastosowanie…
Abstract Rape, camelina, wheat and Jerusalem artichoke vegetable wastes (straw) as annually renewable raw materials were processed into activated carbons, which were modified with silver nanoparticles for carbonaceous sorbents to acquire specific properties, since carbonaceous sorbents are usually widely used in the f…
This paper presents a preliminary study on the effect of dispersive ground parameters on surges transferred from medium-voltage to low-voltage distribution lines located in rural areas. In this study, a direct lightning strike is assumed at different points of a distribution line terminated at a 10 kVA 7.967 kV/240–12…
Films of the L10 Fe50Pt50 phase with a thickness of 20 nm in the multilayer Fe(2 nm)/Fe50Pt50(20 nm)/Pt(2 nm) magnetic structure have been prepared by magnetron sputtering. The multilayer structures have been annealed at 700°C for 30 min and then at 430–600°C for 1 h either in an external magnetic field of ∼3500 Oe, w…
Although pathway-specific kinetic theories are fundamentally important to describe and understand reversible polymerisation kinetics, they come in principle at a cost of having a large number of system-specific parameters. Here, we construct a dynamical Landau theory to describe the kinetics of activated linear supram…