Materials Literature
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High performance polymeric foams have experienced a growing demand in aerospace applications such as cryogenic insulation, flame-retardant panels and structural sub-components. The Next Generation Launch Technology (NGLT) program requires foams capable of retaining their structural integrity while providing insulating…
${\mathrm{Pr}}_{2}{\mathrm{Fe}}_{17}{\mathrm{H}}_{5}$ is an interesting compound where isolated hexagons formed by the tetrahedral sites of the host metal lattice are filled with hydrogen atoms. A localized jump diffusion of hydrogen atoms in ${\mathrm{Pr}}_{2}{\mathrm{Fe}}_{17}{\mathrm{H}}_{5}$ over the vertices of t…
Using molecular dynamics simulations we investigated the effect of aging on static and dynamic properties of supercooled Al2 O3 models at the temperatures of 2100 K and 5600 K . Simulations were done in the basic cube under periodic boundary conditions containing 3000 ions with Born-Mayer type pair potentials. We obta…
Effective complex piezoelectric and dielectric constants of disordered heterogeneous systems, such as statistical mixtures consisting of spheroidal particles of the same orientation but with random distribution in space, are studied. It is found for the first time that, in such systems, there exists giant piezoelectri…
The formation of inclusion complexes between methyl orange (MO) and β-cyclodextrin (β-CD) was studied extensively using UV-visible absorption spectroscopy. In neutral-to-basic media, where MO is an anion, two complexes of stoichiometries 1:1 and 1:2 (guest:host) are formed, as determined by principal components analys…
From June 2000 to June 2002, four sites on the mainstem of the Xiangxi River and one site on each of its major tributaries were sampled 16 times each for benthic algae. All total, 223 taxa (most to species and variety levels) were found (193 Bacillariophyta, 20 Chlorophyta, nine Cyanophyta and one Xanthophyta). The di…
Results from impedance spectroscopy measurements at temperatures between 400 and 1000°C, for single crystal and highly pure and dense polycrystalline α-Al2O3 samples with well-defined grain size, are compared with that from molecular dynamics calculation. Between 650 and 1000°C, the measured activation energy for cond…
Frequency- and temperature-dependent dielectric spectroscopy of a newly-synthesised AFLC compound in its planar orientation has been carried out in order to determine the different dielectric parameters and analyse the various modes of dielectric relaxation of the different phases. The compound is (S)-(+)-4′-(1-methyl…
Nous avons etudie l'aeschynite-(Y) et le polycrase-(Y) metamictes par diffraction X et par spectroscopie de Raman. Afin de retablir leur structure originelle, ces echantillons ont ete chauffes a divers paliers de temperature. Les temperatures 400, 500, 650, 800 et 1000°C semblent, d'apres les traces thermogravimetriqu…
The trypsin-like serine proteases comprise a structurally similar family of proteins with a wide diversity of biological functions. Members of this family play roles in digestion, hemostasis, immune responses, and cancer metastasis. Bovine trypsin is an archetypical member of this family that has been extensively char…
We use lubrication theory on the flow equations for nematic liquid crystals to derive a simple model describing the evolution of the film height under gravity, in the case of finite surface “anchoring energy” at the free surface and at the rigid substrate. This means that the molecules of the nematic have a preferred…
Abstract The inhibition effects of sodium silicate and polyphosphate on corrosion of carbon steel in a potable water supply have been studied using weight loss, electrochemical impedance and Tafel polarization measurements. In the water supply under test there were sufficient calcium ions, (220 ppm), to form the norma…
The word ‘silk’ brings to the mind a kaleidoscope of images: silkworm culture in the villages of China, camel trains on the ancient silk road of Asia, the finery of the mediaeval courts, the workshops of Huguenot refugees in Spitalfields and Macclesfield, Victorian velvet and chiffon mills, the parachutes of Spitfire…
Hydride precipitation along the radial-axial plane increases in high burn-up boiling water reactor (BWR) fuel claddings. The radially-oriented hydrides may have an important role during fuel behavior in a reactivity-initiated accident and may reduce ductility of the cladding under pellet-cladding mechanical interactio…
The region containing reactive cysteines, Cys 707 (SH1)-Cys 697 (SH2), of skeletal muscle myosin is thought to play a key role in the conformational changes of the myosin head during force generation coupled to ATP hydrolysis. In the present study, we synthesized a photochromic crosslinker, 4,4'-azobenzene-dimaleimide…
An Aerosol Test Facility (ATF) has been designed, fabricated, assembled and tested for the fast reactor safety studies. ATF mainly consists of an aerosol chamber, a plasma torch for the production of aerosols of fuel and fission product equivalent materials, a sodium combustion cell for the production of sodium aeroso…
Fluorinated inorganic-organic finishing materials prepared by a sol-gel process using poly(methacrylic acid) (PMAA), tetraethoxysilane (TEos), and perfluoroalkyltriethoxy-silane are applied to nylon carpeting, and their performance is evaluated by means of the industry standards for water repellency, compressibility,…
Vickers hardness, deformation and damage mechanisms of Ti 3 SiC 2 crystals induced by indentation in the load range of 0.25 – 20 N were investigated. The Vickers hardness of Ti 3 SiC 2 crystals decreases with increasing indentation load and finally reaches a constant value of ∼ 4 GPa. The typical deformation and damag…
The relationship between spatially heterogeneous dynamics (SHD) and jamming is studied in a glass-forming binary Lennard-Jones system via molecular dynamics simulations. It has been suggested [ Phys. Rev. Lett . 2001, 86, 111] 1 that the probability distribution of interparticle forces P ( F ) develops a peak at the g…
A novel method called “Reciprocating Extrusion” is exploited to realize the high potential of Mg‐15Al‐1Zn alloy to exhibit superior mechanical properties and superplasticity, bypassing the costly and complicated RS+PM route. Such refined alloys exhibit unique high‐strain‐rate superplasticity at 325 °C and maximum elon…