Fundamentals of Metal Matrix Composites
This chapter contains sections titled: Introduction Materials Interface between Matrix and Reinforcement Theoretical Prediction of Properties Summary References
Materials Literature
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Transitions and Relaxations
Abstract The transitions and relaxation processes in polymers are considered. The recent progress and approaches toward both a phenomenological description and a theoretical understanding of its combined kinetic‐thermodynamic character are outlined. The article discusses some specificity of melting polymers, the natur…
Relaxed exciton luminescence of KCl crystals heavily doped with KI
Abstract Localized relaxed exciton luminescence in heavily doped KCl crystals containing iodine impurities has been investigated at 6 K. The excitation spectra of the I– dimer emission at 4.64 eV exhibit that the excitation peak shifts to the lower energy for the lowest excitation band with increase of the concentrati…
Preparation and in vitro drug release of ferulic acid loaded chitosan microspheres containing liposomes
OBJECTIVE: To construct the ferulic acid loaded chitosan microspheres containing liposomes. METHOD: Ferulic acid was selected to be the model drug. Liposomes were prepared by calcium acetate gradient method. The entrapment efficiency of liposomes was(79.97 +/- 0.54)%, the average size was (187.6 +/- 11.9) nm and the Z…
Crystallization and preliminary X-ray analysis of a novel esterase Rv0045c fromMycobacterium tuberculosis
The Rv0045c protein is predicted to be an esterase that is involved in lipid metabolism in Mycobacterium tuberculosis. The protein was overproduced in Escherichia coli, purified and crystallized using the hanging-drop vapour-diffusion method. The Rv0045c protein crystals diffracted to a resolution of 2.7 Å using a syn…
Formation of periodic nanotube array through the Kirkendall effect in epitaxial heterostructures
The spontaneous formation of hollow nanotubes at the heteroepitaxial interface between near lattice-matched PbSe and ZnTe is reported. Mass-spectroscopy measurements show that the rapid diffusion of zinc into PbSe, and reduced diffusion of Pb outward, governs the formation of the nanotubes by a Kirkendall vacancy-cond…
Strong harmonic generation in the chaotic regime of magnetization reversal in lanthanum manganite
A strong generation of harmonics at radio-frequencies was observed in a four-pole network with a toroidal core made of the manganite La0.6Pb0.4MnO3. Experiments were carried out with an ac radio-frequency electromagnetic field applied perpendicular to a dc magnetic field. It is shown that the threshold of generation o…
Ga and As composition profiles in InP/GaInAs/InP heterostructures—x-ray CTR scattering and cross-sectional STM measurements
Changes of composition profiles in GaInAs layers sandwiched by InP, due to the layer thicknesses, were measured by the x-ray CTR scattering and cross-sectional STM techniques. Both techniques showed quite similar results, which indicates that the x-ray CTR scattering measurements and analyses give us correct compositi…
Electric properties of aqueous grown ZnO nanorods on Au/Ti/Si substrates
Abstract Electric properties of aqueous grown ZnO nanorods were investigated. Vertical current measurement through the top 20‐nm‐thick Au electrode/ZnO nanorods/bottom Au film structure showed asymmetric I‐V properties and was discussed in terms of different interface properties between ZnO nanorods and Au. Schottky b…
Anomalous isotopic effect of tunneling states in NbTi-H/D
The thermal conductivity, heat capacity, and heat release of NbTi, NbTi-H, and NbTi-D were measured at low temperatures. All three systems reveal low-temperature anomalies typical for structural glasses. It is shown that above a concentration of 2% H or D the tunneling states of the NbTi matrix disappear. Therefore, f…
Defocus image contrast in hexagonally-ordered mesoporous material
A transmission electron microscope was used to characterize a powder form of hexagonally-ordered mesoporous silica material. The structural symmetry built into this amorphous material allowed one to obtain three characteristic images, i.e. a hexagonal honey-comb structure and wide/narrow parallel lines. These images w…
Influence of Four Wires Tandem Submerged Arc Welding Process on Heat Affected Zone Properties in High Strength Pipeline Steel
The objective of this investigation was to provide a detailed evaluation of the heat affected zone properties of a high-strength pipeline steel. The X80 high-strength low-alloy microalloyed steel was supplied as a hot rolled plate with accelerated cooling. The four-wire tandem submerged arc welding process with differ…
In-situ characterization of thermal interface materials
In this paper the aspects of thermal interface material characterization are discussed from a practical point of view. A novel method based on existing measurement standards is introduced for a quick and repeatable thermal conductivity measurement of nanoparticle-based thermal greases. The effect of the surface roughn…
Effect of water chemistry improvement on flow-accelerated corrosion in PWR secondary systems
Flow-accelerated corrosion (FAC) of carbon steel (CS) piping has been one of the main issues in light-water nuclear reactors (LWRs). Wall thinning of CS piping due to FAC increases the potential risk of pipe rupture as well as the costs for inspection and replacement of damaged pipes. In particular, corrosion products…
Innovative methodology to extract dynamic compact thermal models: Application to power devices
This paper presents a new and innovative methodology for power components manufacturers to generate accurate boundary condition independent dynamic Compact Thermal Models (“BCI” DCTMs). The originality of this methodology summarized by: taking into account of the thermal behavior of electronic components containing se…
Antioxidant Activity, Moisture-absorbing and Moisture-retention Properties of Collagen Peptides from Different Sources
Objective:To explore the antioxidant activity,moisture-absorbing and moisture-retention properties of collagen peptides from different sources.Methods:The antioxidant activities of collagen peptides from different sources were evaluated by determining their scavenging activities on 2,2-diphenyl-1-picrylhydrazyl(DPPH)…
X-Ray Diffraction and Raman Spectroscopic Studies of Glasses and Glass-Ceramics Inside the A2O-MoO3-Nb2O5-P2O5 (A= Li, Na) Systems
Phosphate glasses in the system (50-x)A2O-xMoO3-10Nb2O5-40P2O5 (AMo-40), with x=0; 30 and A=Li or Na were prepared by the melt quenching method. The effect in the crystallization behaviour of the glass due to the introduction of MoO3 in the glass composition and varying the molar ratio between network modifiers and ne…
The problem of infinitely cascaded thermoelectric converters and their optimization
A rigorous optimization procedure for cascaded thermoelectric (TE) converters is presented. The newly introduced method of generalized Lagrange multiplier functions leads to a coupled system of ordinary differential equations which can be solved swiftly numerically. That mVay also be of interest in other branches of p…
Influence of Bulk and Interface Porosity on the Adhesion of Sintered Ag Films on Barium Titanate Substrates
Abstract Measurements of the practical adhesion of screen‐printed Ag films on BaTiO3 substrates have been completed, showing that the interfacial crack propagation energy decreases rapidly with increasing silver volume porosity. A geometrical model is proposed to estimate the interface porosity, which is relevant for…
Time variation of source‐drain current for organic field‐effect transistors with dipoles of insulator surface
Abstract Time variation of the source‐drain current for organic field‐effect transistors (OFETs) with aminopropyl and octadecyl groups on the insulator layer was examined. The source‐drain current of both OFETs decreased with time immediately after the application of the gate voltage. The decrease in the source‐drain…