Materials Literature
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The Raman and infrared (IR) spectra of ethylene carbonate (EC) containing various concentrations of lithium perchlorate have been studied. It was found that both the vibrational frequencies and the relative intensities of the bands related to the ring structure and C=O group of the EC molecule change with the concentr…
Teflon clad and As/sub 40/S/sub 60/ glass clad As/sub 40/S/sub 55/Se/sub 5/ fibers transmitting in the 1-6 /spl mu/m wavelength region have been fabricated in lengths of about 50 m and with minimum losses of 0.098 and 0.65 dB/m, respectively. Short lengths of the Teflon clad fiber possessed a minimum loss of 0.047 dB/…
MOCVD has many promising advantages over physical processes but industrial applications are still sparse, probably because commercial availability of suitable precursors is limited. In this Research News article the stringent requirements for metal‐organic compounds for thermal MOCVD as well as for photo‐MOCVD and MOM…
Abstract For a range of different fillers, silicas and carbon blacks, added to a rubber melt at various concentrations, dynamic moduli in the linear viscoelastic limit have been determined. It is shown that reinforcement is due to hydrodynamic effects and the formation of a secondary particulate structure within the r…
Barley starch was plasticized in a melt mixer using glycerol and water as plasticizers. Plasticizer concentration, time, temperature, and shear were varied, and their effects on the molecular weight of starch and the glass transition temperature and mechanical properties of the mixtures were studied. Depolymerization…
Electromigration reliability of different metallization systems (Al-2%Si, Al-Cu/TiW, Cu, and TiN/Al-2%Si/TiN) and structures (Al-via and W-plug) under bidirectional current stress has been studied in a wide frequency range (from mHz to 200 MHz). The experimental results show that at low frequency, the damage healing f…
Abstract Thermal and microwave‐activated ring‐opening polymerization at 180°C in the presence of titanium tetrabutylate at different ε‐caprolactone/titanium tetrabutylate molar ratios were compared. A special equipment was developed to control polymerization in the microwave field and to simultaneously monitor viscosi…
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…