Materials Literature
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This paper attempts to theoretically analyze the tension and pressure decay of a single layer tubular elastic fabric used for pressure garments. In the theoretical analysis, we assume that the exponential decay model of the fabric tube on pressure and tension is used and supported by the experiment. We also reveal tha…
Optical and electron microscopies are used to analyze the mechanism and kinetics of internal reduction of an Fe 2+ ‐doped magnesium aluminosilicate melt. Melt samples are heated to temperatures in the range of 1300°–1400°C under a flowing gas mixture of CO/CO 2 , which corresponds to a p O2 range of 1 × 10 −13 –4 × 10…
The present article describes the energy evaluation of bubble generation and shock wave emission by laser focusing in liquid nitrogen at 78 K. By adjusting the ambient pressures to 164.9 kPa which corresponds to an overpressure, Δp, of 58.8 kPa, the threshold energy for bubble generation can be investigated. When the…
Supramolecular liquid crystalline complexes have been obtained from binary mixtures of 4-(alkoxyphenylazo) pyridines and 4-octyloxylbenzoic acid. None of the pyridine-based derivatives is mesomorphic, but the hydrogen-bonded complexes are. Their liquid crystalline properties were investigated by DSC, polarizing optica…
A compact classical electron spin detector based on Mott scattering is described. This Mott polarimeter has an efficiency of ≈5.6×10−4, a maximum counting rate of 500 kcps and bulk size 15 cm×25 cm. The design of the polarimeter goes back to the classical Mott detector, operating from 100 to 120 kV but it can be combi…
Thin BaTiO3 (BTO) layers were deposited by magnetron sputtering on a Si substrate between two thin LaNiO3 (LNO) electrodes (LNO/BTO/LNO/Si structure). The thickness of the BTO layer was varied between 35 nm and 1 μm. The stress, dielectric permittivity, and ferroelectric hysteresis loop were measured after deposition…
The optical performances of a liquid crystal (LC) Fabry–Perot (FP) etalon in various configurations were simulated by a faster 4×4 matrix method. Results show that the FP with a 90° twisted nematic LC is polarization insensitive if the applied voltage exceeds ∼3X of the Freedericksz transition threshold. This method c…
Plasma polymerization of pyrrole was carried out in the presence and absence of iodine, and the resulting films were characterized by optical and electrical means. Their infrared spectra were very similar to each other, suggesting that iodine was neither bonded in any manner to, nor strongly interacting with, the pyrr…
Plastic optical parts require antireflective as well as hard coatings. A novel design concept for coating plastics combines both functions. Symmetrical three-layer periods with a phase thickness of 3/2pi are arranged in a multilayer to achieve a step-down refractive-index profile. It is shown mathematically that the e…
Since their discovery in 1991, carbon nanotubes have attracted much attention and generated a great deal of research interest due to their unique structures and properties. Both theoretical modeling and experimental work have been carried out concerning the production, purification, properties and applications of carb…
Carbon atoms forming the cap of a carbon nanotube are selectively removed through a technique that causes field evaporation during field emission. The resulting changes in the spatially resolved electronic structure are imaged in real time using field emission microscopy. We demonstrate that through repetitive field e…
Long duration phosphorescent SrAl2O4 phosphors doped with various auxiliary activators (Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) have been evaluated for the fiber-optic thermometer application. In this thermometer, temperature was measured based on the temperature dependence of the lifetime and/or in…
RATIONALE AND OBJECTIVES: The purpose of this study was to evaluate superparamagnetic iron oxide (SPIO) nanoparticles to discriminate infarcted from normal tissue after myocardial infarction using high field MR imaging (7 tesla). MATERIALS AND METHODS: Permanent myocardial infarction was induced in rats. SPIO nanopart…
We describe an optical metrology for measuring shear-induced structure and orientation in dilute dispersions of multiwalled carbon nanotubes. Small-angle polarized light scattering and optical microscopy are combined in situ to quantify the structural anisotropy of multiwalled carbon nanotubes in semidilute, surfactan…
High lateral resolution direct imaging of surfaces with chemical sensitivity is of increasing importance for basic and applied research in the field of surface and materials science. A novel and versatile beamline, to be employed for the spectromicroscopic study of surfaces in the submicron range, is now available at…
ZnO is a wide bandgap semiconductor with a direct bandgap of 3.32eV at room temperature. It is a candidate material for ultraviolet LED and laser. ZnO has an exciton binding energy of 60 meV, much higher than that of GaN. It is found to be significantly more radiation hard than Si, GaAs, and GaN, which is critical aga…
Abstract The objective of this work was to evaluate the effects of a new boron-nitrogen, phosphate-free fire-retardant (FR) formulation on several mechanical properties of FR-treated wood and to assess the potential of this treatment for in-service thermal-induced strength loss resulting from exposure to high temperat…
In this work, the diamond deposited by hot filament chemical vapor deposition (CVD) is polished using an atmospheric pressure plasma. In order to position the film relative to the plasma, a microactuator system is designed using a stack of domed piezoelectric actuators. A dynamic model based on the physical system is…
In protecting food, packagings are shifting from passive protection to taking an active role in improving food quality. The active packaging, consisting of a polymer liner with an active agent in it, is able to produce a desired effect on the food. A wide variety of active agents exist, such as antimicrobials, which c…
Hydrogen-terminated Si [111] surfaces have been studied for tribological performance in the sliding of a diamond slider to obtain fundamental information on contact problems between an Si memory disk and the slider. The authors focus on the tribological role of the atoms on the contact surfaces and observe an extraord…