Materials Literature
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Sepiolite is a high surface area clay mineral containing channels of molecular dimensions. In industrial applications as an adsorbent or catalyst support, the mineral should have thermal stability. In this study, the effect of heat treatment on sepiolite structure was investigated. Thermal decomposition of raw sepioli…
PURPOSE: To quantify regional cerebral blood volume (rCBV) on the basis of the enhancement of blood proton relaxation rates after intravenous administration of gadopentetate dimeglumine. METHODS: A series of sequential MR images on one section was recorded during bolus transit with a standard fast low-angle shot seque…
This paper presents a numerical model for the analysis of magneto-mechanical problems in magnetostrictive materials. The governing equations of these phenomena are solved simultaneously using a strong coupling model based on the finite element method. The magnetic force in magnetostrictive materials is calculated by a…
The effect of 60Co radiation on the noise and drain-source current characteristics of hydrogenated amorphous silicon (alpha-Si:H) field-effect transistors (FETs) was examined as a function of dose to cumulative doses as high as approximately 2 x 10(4) Gy. Following these measurements, room-temperature and elevated-tem…
High transmittance, low resistivity, and c-axis highly oriented ZnO:Ga thin films on glass were obtained by laser ablation at different deposition temperatures. The surface morphology, crystalline structure, and optical and electrical properties were found to depend directly on substrate temperature. From optical and…
An assessment of the experimental findings leads to the conclusion that optimal structural superplasticity results from grain/interphase boundary sliding—diffusion coupled flow. An analysis of the boundary sliding process is presented first. By suggesting that both regions I and IIa (lower stress range of region II) o…
Today, after continued development and extensive field and laboratory testing, nonceramic insulators are in use through 765 kV. At transmission voltages, nonceramic insulators have become very popular from 69 through 345 kV. Above 345 kV some nonceramic insulators are in use; however, their usage has not yet become si…
The effects of woven structures on fluid flow through basic weaves of monofilament filter cloths are studied numerically using the fluid-flow software FLUENT. The flow pattern and resistance to flow in the interstices are obtained as results of the numerical solution. The results show that the construction of the fabr…
Hydrogen in porous Vycor glass (pore radius ${\mathit{R}}_{\mathit{p}}$=3.0 nm) has been investigated with a torsional oscillator technique at 7.5 K \ensuremath{\le}T\ensuremath{\le} 22 K. ${\mathrm{H}}_{2}$ molecules which are adsorbed in Vycor at T\ensuremath{\gtrsim}${\mathit{T}}_{3}$ (${\mathit{T}}_{3}$, triple po…
We have investigated the crystal structure, surface morphology, and electrical conductance of Cu films grown on H-terminated Si(100). The films were grown by thermal evaporation at 10−8 Torr, at deposition rates from 0.1 to 3.5 nm/s and at substrate temperatures from room temperature up to 200 °C. Typical film thickne…
This paper presents the implicit Runge-Kutta methods as an interesting alternative to Crank-Nicolson and backward Euler methods to solve differential algebraic systems arising in nonlinear transient magnetodynamic problems.
Multicomponent transparent conducting oxide films with electrical, optical, and chemical properties that varied with the composition were prepared by rf magnetron sputtering. A resistivity as low as 2.8×10−3 Ω cm was obtained for InGaO3 films prepared at substrate temperatures of room temperature and 350 °C. In deposi…
Abstract Peroxidase‐catalyzed phenol polymerization in the presence of hydrogen peroxide has been extensively studied. The process offers many advantages over the conventional chemical process to produce phenol‐based resins. The enzymatic process avoids the use of formaldehyde and results in minimal formation of by‐pr…
The importance of defects in the formation of graphitic structures such as fullerenes, nanotubes, onion-like structures, helically coiled nanotubes and hypothetical periodic structures is analyzed. The structures mentioned above can also present defects which preserve their connectivity and topology. We have calculate…
Bi 0.5 Na 0.5 TiO 3 (BNT) modified with Pb showed an increased and broadened dielectric constant and limited grain growth. Pb also lowered the first transition temperature. The phases of BNT were confirmed to be ferroelectric at room temperature which transformed to antiferroelectric above 220°C. When BNT was doped wi…
The structure determination of the glutamate dehydrogenase from the hyperthermophile Pyrococcus furiosus has been completed at 2.2 A resolution. The structure has been compared with the glutamate dehydrogenases from the mesophiles Clostridium symbiosum, Escherichia coli and Neurospora crassa. This comparison has revea…
A systematic investigation of hydrogenated amorphous substoichiometric silicon oxide films (a-SiOx: H) is presented. The a-SiOx: H films were prepared by dc magnetron sputtering and were subsequently annealed at temperatures ranging from 300 to 900°C. No formation of nanocrystals is detectable either with X-ray diffra…
Abstract It is shown that supermolecules with a tetrahedral symmetry and appropriate side‐chains exhibit liquid‐crystalline phase behaviour. The use of an optimised hydrosylation reaction allows for the synthesis of materials that have four mesogenic groups attached to a siloxane core, where the conformation and the c…
Abstract The scope of this paper is to review peroxide curing of diene elastomers. At high dicumyl peroxide loading and high curing temperature, changes in the crosslinking mechanisms were observed. Both Abstraction of allylic hydrogen and addition to the double bond can act as mechanisms of crosslinking. IR spectrosc…
Single-crystal high-pressure X-ray diffraction studies on the protein crystals of orthorhombic and tetragonal hen egg-white lysozyme polymorphs were carried out using a Merrill-Bassett diamond-anvil cell, image-plate detector and synchrotron radiation. The orthorhombic crystal has been squeezed to 85.5% of its ambient…