Materials Literature
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New degrees of freedom in optical design are attained by introducing in the optical path abrupt phase changes over the scale of the wavelength. In this talk, I will discuss experiments on optically thin components based on phase discontinuities and applications.
For observation of parasitic reaction effect during InAlN material growth by Metal-Organic Chemical Vapor Deposition (MOCVD), the growth parameters include temperature and pressure had been varied to investigate it. The pressure would be kept at 50torr, 100torr and 150torr and temperature was varied from 700 °C to 780…
A produção de revestimentos soldados permite a proteção de componentes respeitando suas propriedades estruturais e em simultâneo otimiza a resistência ao meio. Avanços significativos podem ser conseguidos se for possível usufruir materiais com propriedades mais nobres mas tipicamente associadas a baixa. Procedimentos…
The problem of plane electromagnetic wave scattering by doubly periodic dielectric structures with pyramidal and conical elements arranged on a homogeneous dielectric substrate is considered. A hybrid projective method involving the method of coupled waves, the method of projective mathing of fields on the boundaries…
Recently, a new PLZT bulk single plate, called ceramic-controlled piezoelectric with two Pt wires (CCP2) has been produced; this CCP2 has two (300 μm of diameter and 1 cm long) Pt-wire implants. These isolation was validated using four experimental setups, one of them determine that ceramic-controlled piezoelectric wi…
Tin dioxide (SnO2) microparticles have been grown on p-type Si (100) substrate by thermal evaporation method. The experiment was conducted at 1080oC, under 1.6% oxygen (O2) gas in atmospheric ambient. The prepared film were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM…
Interaction of actinides(IV) with hydroxyisobutyric acid (HHIB) in aqueous solutions and in the course of crystallization of solid compounds was studied. The complexes ML (4-)+ (M = U, Np, Pu; L− is hydroxyisobutyrate anion; n = 1, 2, 3) exist in solution. Their apparent stepwise stability constants K′ i were measured…
We discuss the conditions in which guided modes exist in a fiber with anisotropic, uniaxial metamaterial cladding. These hollow-core fibers can offer sub-diffraction guidance.
The phase diagram of the Ga2Se3-In2Se3system as investigated by differential-thermal analysis (DTA) and X-ray diffraction (XRD) method. The single crystals from the area of existence of the γ2phase with the compositions (Ga0.6In0.4)2Se3and (Ga0.594In0.396Er0.01)2Se3were grown by a vertical Bridgman method. Absorption…
The electric and magnetic properties of the magnetically soft Fe-Si-B-Nb-Cu alloy (Finemet), as a candidate on the absorber at microwaves, have been studied in the frequency range from 0.2 to 10 GHz. Measurements were achieved with the use of the coaxial line technique, where the scattering parameters at broadband fre…
The coagulating power of lithium, sodium, and potassium chlorides in rubber recovery from SKS-30 ARK latex at 20, 40, and 60°C and from a model polystyrene latex was studied. The electrokinetic potential of the polystyrene latex at various concentrations (5, 20, 80 mM) of the chlorides added was measured.
This paper examines the influence of the lightning channel geometry, and the variation of the linear charge density with height, in a model for the first return stroke. The tortuous geometry of the discharge channel is simulated by means of statistical characterizations of natural lightning reported in the literature.…
We report results from a numerical study of optical-frequency signal transmission via localized surface plasmons (LSPs). LSPs excited within a Au disk on a Si substrate propagate over a chain of disks providing the signal.
The graphs for variation of vacancy formation energy ( ) with rc of Ashcroft's empty core model potential for different exchange and correlation functions are shown for six bcc metals, viz. Li, Na, K, Rb, Cs and Ba. Fitted value of for Li, Na, K, Rb, Cs and Ba are respectively 1.343, 1.694, 2.205, 2.384, 2.962 and 2.3…
Abstract Al62Cu25.5Fe12.5 (A) and Al65Cu20Fe15 (B) alloys were fabricated via melting and experimentally studied in both as-cast and annealed conditions. Alloy (B) was also fabricated using mechanical alloying and an annealing treatment. The melted alloys were characterized to investigate the distribution of alloying…
The frequency of minimum threshold for subharmonic generation from contrast microbubbles is investigated here. Increased damping—either due to the small radius or the encapsulation—is shown to shift the minimum threshold away from twice the resonance frequency. Free bubbles as well as four different models of the cont…
We propose an analytic theory of resonances in metallic nanoslit arrays. This is a minimal formulation of the essential physics involved in the resonance interactions of surface plasmon-polaritons and cavity modes.
The perovskite BiFeO3has received considerable attention over decades due to its unique combination of ferroelectric and magnetic properties at room temperature. Recently it has been reported that linear magnetoelectric coupling in BiFeO3can be realized by artificially introduced disorder like in solid solutions, wher…
Insulation failure is one of the major causes of catastrophic failure of high voltage apparatus. It is important for the study of partial discharge behavior in electrical apparatus to know the degration of insulating materials. This paper focuses on the analysis of acoustic signal produced by partial discharge in insu…
By Computer finite element analysis, the impact of the interface thickness, the interface module and the short fiber orientation of Al2O3-SiO2(sf)/AZ91D composite on the maximum fiber axial stress and the steady creep rate is studied. Maximum axial stress of the short fiber is in the fiber center, and the axial stress…