Materials Literature
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Abstract A finite element simulation is proposed for the shaping of glass fiber fabric. The overall mechanical behavior of the fabric is obtained by combining the tensile behavior of a single thread and the current position of threads in the fabric. The constitutive model for a single thread in tension is based on a s…
Discotic liquid crystals represent a promising class of new materials, for example, with respect to their photoconductivity properties. To tailor the processability and mesophase behaviour of such materials, specifically functionalized cores are required as precursor molecules for discotic oligomers, polymers and netw…
Reactive porous rods of poly[(chloromethyl)styrene-co-divinylbenzene] have been prepared for the first time by copolymerization of the monomers in the presence of a porogenic diluent. A two-step modification process involving reaction with ethylenediamine followed by reaction with gamma-gluconolactone leads to a porou…
For nearly symmetric binary fluid mixtures, the coupling between concentration and velocity fields leads to a quick hydrodynamic coarsening: For bicontinuous phase separation, the pattern evolution is known to be governed by tube hydrodynamic instability. The interface tension is a driving force in the hydrodynamic co…
Abstract The dynamics of a large number of bubbles separated by distances of the order of their radii in highly viscous fluids with specific application to foams is investigated. The growth of bubbles is due to diffusion of gas from the fluid and the momentum transfer between the fluid and the bubbles. Equations gover…
Experimental observations performed on polycrystalline Cu-based Shape memory alloys exhibit assymmetrical responses for tensile or compressive test.We used a micromechanical point of view to determine the physical origin of this dissymmetry.At first approximation, we assume that the stress field is uniform inside the…
Nanocomposite materials in the form of nanometer‐sized second‐phase particles dispersed in a ceramic matrix have been shown to display enhanced mechanical properties. In spite of this potential, processing methodologies to produce these nanocomposites are not well established. In this paper, we describe a new method f…
X‐ray photoelectron spectroscopy (XPS) has been used to study surface segregation in 9.5 mol% single‐crystal Y 2 O 3 ‐ZrO 2 which has been subjected to air anneals at temperatures ranging from 900° to 1500°C. The kinetics of segregation reveal an enrichment of Y, Si, Na, and Fe at short times; however, at longer times…
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<div class="htmlview paragraph">Vacuum insulation and phase-change thermal storage have been used to enhance the heat retention of a prototype catalytic converter. Storing heat in the converter between trips allows exhaust gases to be converted more quickly, significantly reducing cold-start emissions. Using a s…
Mitochondrial 2-enoyl-CoA hydratase (mECH) and 3,2-trans-enoyl-CoA isomerase (mECI), two enzymes which catalyze totally different reactions in fatty acid beta-oxidation, belong to the low-similarity hydratase/isomerase enzyme superfamily. Their substrates and reaction mechanisms are similar [Müller-Newen, G. & Stoffel…
This article reviews aspects of the electronic, chemical, and structural properties of metal/oxide and oxide/oxide interfaces which are formed via ultrathin film growth on oxide single-crystal surfaces. The interactions at the interfaces are classified based on the nature of the reaction products, thermodynamic predic…
The influence of ethylene oxide gas treatment on the in vitro degradation behavior of noncrosslinked, glutaraldehyde crosslinked or hexamethylene diisocyanate crosslinked dermal sheep collagen (DSC) using bacterial collagenase is described. The results obtained were compared with the degradation behavior of either non…
The multifragment emission for central collisions of $^{40}\mathrm{Ar}$ (25--150 MeV/nucleon) on $^{27}\mathrm{Al}$ was studied via the quantum molecular dynamics model. The distribution of intermediate mass fragments (IMFs) can be described by a power-law function with the parameter \ensuremath{\tau} or an exponentia…
The second-electron affinity of the oxygen atom is often required in modelling the behaviour of ceramics. It is usually taken to be about 8 eV, independent of the structure of the oxide being modelled. We show that this is not so. Quantum-mechanical calculations show that the true second-electron affinity of an in-cry…
Abstract New phosphorylated epoxy‐imide polymer was obtained using diimide‐diepoxide (DIDE) cured with bis(3‐aminophenyl)methylphosphine oxide (BAMP). In addition, composition of the synthesized diimide‐diepoxide (DIDE) with common curing agents, e.g., 4,4′‐diaminodiphenylether (DDE) and 4,4′‐diaminodiphenylsulfone (D…
Metallocene/aluminoxane catalysts are among the most important recent discoveries in the field of catalytic polymerization of olefins. Not only their high activities, but also the fact that they permit the synthesis of polymers with superior blends of properties are remarkable both from academic and industrial points…
RATIONALE AND OBJECTIVES: Gd-DTPA is a well-characterized, safe contrast agent frequently used in magnetic resonance imaging (MRI) of the central nervous system. The purpose of this double-blind, comparative MRI study of brain, spine, trunk, and limbs was to evaluate the safety and efficacy of Gd-DOTA versus Gd-DTPA i…
We have observed strong photoluminescence (PL) from a well-defined two-dimensional (2D) Si structure formed on a SIMOX (separation by implanted oxygen) wafer, where the thin ( <5 nm) single crystalline silicon film is sandwiched between SiO 2 layers. The PL intensity has a sharp maximum at a Si thickness of about 2…
Quality factors and fluence-to-ambient and fluence-to-personal-dose equivalent conversion factors for neutrons have been recalculated for neutrons with energies ranging from thermal to 20 MeV. The new calculations are based on the recommendations given in ICRU Publication 60 for the quality factor and on stopping powe…