Materials Literature
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The high-frequency and time-dependent behavior of carbon-nanotube (CN) transistors is examined by numerically solving the time-dependent Boltzmann transport equation self-consistently with the Poisson equation. The two-port admittance matrix, containing the transistor'sy-parameters, is extracted. At frequencies below…
A theoretical model is presented of the visible, near-infrared, and near-ultraviolet transmittance spectra of arbitrarily-shaped small-sized insulator particles embedded in an insulator in relation to the particle dimensions and the radiation frequency. The model is based on a number of assumptions. In the band gap of…
Low-reversible charging processes are studied on highly dispersed carbon electrodes used in double-layer capacitors and having high specific surface area (higher than 1000 m 2 /g). Restrictions on power and cyclability of such capacitors are due to the occurrence of irreversible and low-reversible electrode recharging…
Abstract Two novel transition‐metal complex templated borates containing crystalline water, Co(en) 3 [B 4 O 5 (OH) 4 ]Cl·3H 2 O ( 1 ) and [Ni(en) 3 ][B 5 O 6 (OH) 4 ] 2 ·2H 2 O ( 2 ), have been synthesized hydrothermally and characterized by elemental analysis, single crystal X‐ray diffraction, FT‐IR spectroscopy, and…
Recent years, technologies for new energy have developed rapidly since the energy crisis and the environmental pollution got worse. And the solar energy generation technology tends towards the stage of a large number of applications in engineering from the research stage. This paper designed a grid-connected PV system…
The molecular dynamics of liquid lead is simulated at T = 613 K using the following three models of an interparticle interaction potential: the Dzugutov pair potential and two multiparticle potentials (the “glue” potential and the Gupta potential). One of the purposes of this work is to determine the optimal model pot…
Microstructural studies using transmission electron microscopy were performed on a ZnO:Mn diluted magnetic semiconductor thin film. The high-resolution imaging and electron diffraction reveal that the ZnO:Mn thin film has a high structural quality and is free of clustering/segregated phases. High-angle annular dark fi…
Boron carbide (B 4 C) powders were synthesized by calciothermic reduction process from the mixtures of borax (or boron trioxide), petroleum coke, and calcium. The synthesized materials were characterized by XRD, SEM, and chemical analysis.
A study of the resistance to fatigue-crack growth in a submicrocrystalline alloy Al-6% Mg-0.3% Sc-0.4% Mn in combination with a precision analysis of the fracture surface of the samples has been performed. A comparison of crack resistance between coarse-grained and submicrocrystalline states of this alloy showed that…
This paper is a summary of the lecture Michael Hanack gave at the 5th ICPP meeting in Moscow. A new method for the preparation of phthalonitriles is reported which makes the syntheses of substituted phthalocyanines much easier. Then the generation of highly reactive dehydrophthalocyanines using different methods is de…
Thin-film solid-state rechargeable batteries are ideal power sources for microsystems applications, where a high level of integration is required. The technology and the steps involving the fabrication of such a battery are discussed in this paper. A DC reactive sputtering technique was used in the thin-films depositi…
Abstract An experimental investigation into the effects of two frequencies of low‐power ultrasound on detergent (Teepol) stabilised air‐water foams is presented. Foam was subjected to ultrasound at 28 and 40 kHz with a power‐to‐foam volume ratio of approximately 3 W l −1 with particular consideration being given to th…
Homogeneous dispersion of multi-walled carbon nanotubes (CNTs) in aqueous solution was achieved using several dispersants. The most efficacious dispersant was Polyethyleneimine (PEI). Stable CNT dispersions are found to have higher zeta potentials compared to poorly dispersed suspensions. Application of a strong magne…
Fine-grained (on the order of several microns in grain size) ceramics have been produced from various nano- and submicron-sized powders (silica, alumina, titania, aluminum nitride, and tungsten carbide). The compaction and sintering behaviors of various powder mixtures and the properties of the resultant ceramics have…
The corrosion behaviour of zinc in chloride medium was investigated in the absence as well as the presence, of acetate ions. The temperature effect was also investigated by varying the temperature in a range of 298 to 328 K, while the pH was kept constant at 8.5. Polarization resistance (R p ) and activation energy (E…
Electron-microscopic and electron-graphic analysis has demonstrated that the Zr 2 Co 11 compound has a complex structure. All grains consist of thin plates of a high-temperature rhombohedral phase, which are parallel to the (0001) crystallographic plane; the crystal lattices in the neighboring regions have a twin orie…
Abstract By combining a non‐equilibrium, atmospheric pressure, plasma jet with an aerosol delivery system, it is possible to deposit polymeric coatings onto three‐dimensional substrates. In this study, the effects of varying process parameters on the deposition of a fluorocarbon precursor, using this system, are inves…
The main aim of this paper is to present a new modelling of transformers in Simulink/Matlab enabling to simulate slow transients more accurate than the existing models used in the software. In this paper, first several types of transformer cores and their magnetic behaviors are described. Next, for accurate simulation…
We present a complete model and design approach for high speed electro-optic (EO) polymer modulators. A general numerical model for arbitrary travelling-wave EO modulators is built, and the dispersion characteristic of each polymer layer in the device stack is carefully considered and integrated into the model. A velo…
The thermal flash method was developed to characterize the thermal diffusivity of micro/nanofibers without concern for thermal contact resistance, which is commonly a barrier to accurate thermal measurement of these materials. Within a scanning electron microscope, a micromanipulator supplies instantaneous heating to…