Materials Literature
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A generalized lightning traveling current source (GTCS) return stroke model has been used to examine the characteristics of the lightning channel corona sheath surrounding a thin channel core. The return stroke process is modeled with positive charge coming from the channel core discharging negative leader charge in t…
This paper is focused on thermal and optical properties of four-chip HPLED package with different thermal interface materials. The package is attached to MCPCB via solder paste and thermal compound. Through cumulative structure function, solder point of HPLED package is determined as 2.955K/W. The photometric properti…
Many of the acoustic cloak designs are based on the acoustic analogy of transformation optics. This process dictates some major challenges when realizing such cloaks: the materials are very otherworldly. One of the most significant obstacles, the mass-anisotropy, has been removed by using two isotropic acoustic materi…
A new hybrid film solar cell was made with a structure of Glass/ITO/PbS/P3HT/Al. PbS film was prepared by a simple solid-solid reaction and poly(3-hexylthiophene) (P3HT) film was obtained by a spin coating method. The solar cells are photosensitive in a large spectral range (extending from near infrared to high energy…
Because the general properties of complex waves are not contained in any one reference of which we are aware, we summarize some of the general properties of complex waves supported by uniform or periodic source-free waveguides and discuss some of the distinguishing features of fast and slow waves.
In order to investigate the temperature dependence of the ZnO phonon dispersion the inelastic neutron scattering measurements were performed on large, single crystal of this compound. The acoustic branches were determined at several temperatures between liquid helium temperature and room temperature along selected hig…
Possibility of the employment of a linear coupling equation of mass attenuation coefficients for two energies for the density determination by dual-energy X-ray absorptiometry of multicomponent samples with variable content was theoretically approved and experimentally demonstrated. The relative error of the density m…
One of the critical components to be developed for high-voltage superconducting devices, such as superconducting transformers, cables, and fault current limiters, is a high-voltage bushing to supply a high current to devices without insulation difficulties in cryogenic environments. Unfortunately, suitable bushings fo…
Thin structure of the anode-electrolyte interface (AEI) was studied, and plausible nucleation and growth mechanisms at electron-beam physical vapor deposition (EB-PVD) were established. ZrO2condensates with two mechanisms - planar and cellular ones like it happens at solidification from liquid phase. ZrO2condensation…
The dilatometric measurements of a TiNi-based alloy during thermal cycling through the temperature range of the B2 ⟷ martensitic transformations performed simultaneously with electrical resistance measurements and supplemented with differential scanning calorimetry analysis demonstrate two-stage deformation. At the fi…
The results of investigations of current-voltage characteristics for metal-dielectric-metal and metal-dielectric-semiconductor-metal structures, where crystalline and glass lithium borates used as dielectrics, are presented.
Germanium dioxide (GeO2) thin film with a high-quality interface was directly formed by using a damage-free and low-temperature neutral beam oxidation (NBO) process. GeO2film with little suboxide could be formed even at a low substrate temperature of 300°C because of the extremely low activation energy (Ea) oxidation…
The true reasons of decrease in efficiency of "breathing" gases cleaning of tanks and railway tanks from methanol on CJSC "Methanol" (Tomsk, Russia) are determined. Platinum catalyst aging is caused by sintering and partial destruction of ceramic blocks owing to excess of ultimate service temperature, blocking of the…
Abstract We observed the condensation of water and ethanol on a hydrophobic polymer film coated with fluorinated silicone particles and identified five states: the circular droplet, ellipsoidal droplet, network, huge droplet, and film states. The shape of the condensed droplets changed with the particle density and th…
In this work, we used bulk monocrystalline p-type Si (100) substrate as the acceptor and core/shell CdSe/ZnS QDs as the donor. To match the absorption spectrum of silicon, QD peak emission wavelength was set to 580 nm. Our Si substrates possessed approximately 1.65 nm thick native oxide on the top, as verified by the…
The covalent incorporation of C60 into one block of a poly(1,4-(2,5-dioctyloxy)phenylene vinylene)-based diblock copolymer resulted in a donor–acceptor diblock copolymer, which demonstrated a very efficient electron transfer upon excitation of the PPV block. The strong quenching of the photoluminescence from the PPV b…
Analyzing mechanism of the chip formation is a significant way to understand the metal cutting process better. The characterization of serrated chip formation in high speed machining of hardened AISI1045 steel is investigated with the aid of optical microscopy and micro-hardness measurement in this paper. The chip mor…
This paper presents a high-mobility low-power ZnO thin film transistor deposited at low temperature on plastic substrates. A mobility of 52 cm2/Vs is achieved for this transistor, signifying its application in flexible electronics and displays.
Equivalent electric circuits allowing the simulation of the behaviour of nanocomposites based on thermosetting resin and nanocarbon filler over a broad range of frequency are presented. The electric circuits are constructed by employing a multi-step simple procedure in which the values and number of the parameters are…
We have revealed a giant exchange bias (EB) in a colossal magnetoresistance Nd2/3Ca1/3MnO3manganite at low temperatures, evident of its intrinsic interface exchange coupling. The phenomenon found confirms our previous assumption that the low temperature magnetic structure of the compound is represented by small (nano-…