Materials Literature
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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…
The real part of dielectric constant (ε΄) and dielectric loss tangent(tanδ) were studied for Al.- substituted Ni – Cd spinel ferrites having thechemical formula Ni0.7 Cd0.3 Fe2-x Alx O4 where [x= 0.4, 0.6, 0.8,and 1] This iscarried our in the range of temperature from room temperature up to 650 Kand applying frequenci…
Glass-ceramics based on the naturally occurring quadruple chain silicate, canasite (Na 4 K 2 Ca 5 Si 12 O 30 F 4 ), have been produced. The phase evolution of these materials has been investigated using differential thermal analysis (DTA), X-ray diffraction (XRD), and scanning and transmission electron microscopy (SEM…
Escherichia coli fatty acid cyclopropane synthase (CFAS) was overproduced and purified as a His6-tagged protein. This recombinant enzyme is as active as the native enzyme with a Km of 90 microm for S-AdoMet and a specific activity of 5 x 10(-2) micromol.min(-1).mg(-1). The enzyme is devoid of organic or metal cofactor…
A simple synthetic route for the preparation of luminescent and rodlike CdS nanocrystals embedded in poly(BA -co- GMA -co- GMA-IDA) (PBGM) copolymer templates, by soap-free emulsion copolymerization, is presented. In this study, GMA-IDA chelating groups within the copolymer were the coordination sites for chelating Cd…
Abstract The new deeply colored solids (AgI) 2 Te 6 and (AgI) 2 Se 6 are obtained under hydrothermal conditions in hydroiodic acid. They contain molecules of cyclic hexatellurium and hexaselenium (Te 6 , Se 6 , respectively, both chair conformations) stabilized in a matrix of AgI. Whereas Se 6 molecules are well known…
A signal loss is generally reported in electron probe microanalysis (EPMA) of porous, highly divided materials like heterogeneous catalysts. The hypothesis generally proposed to explain this signal loss refers to porosity, roughness, energy losses at interfaces, or charging effects. In this work we investigate by Mont…
A re-investigation of the chemical constituents of the stem bark of Symplocos racemosa Roxb. led to the isolation of four new glycosides, symplocomoside (1), symponoside (2), symplososide (3) and symploveroside (4). Benzoylsalireposide (5) and salireposide (6) were re-isolated from this plant. The structures of the ne…
As predicted at the B3LYP/LANL2MB level of theory, the adsorption of tetraaza[14]annulene ligands (simple analogues of porphyrins and phthalocyanines) on single-walled carbon nanotubes is insignificantly influenced by the presence of aliphatic (methyl) or/and aromatic (benzo) substituents on the macrocyclic molecules.…
The mechanism, microstructure and mechanical properties of transient liquid phase (TLP) bonded magnesium alloy (Mg – 3Al – 1Zn) joints using copper interlayers in an argon atmosphere have been investigated. The formation process of the TLP joint comprises a number of stages: plastic deformation and solid state diffusi…
The goal of this article is first to review the charging effects occurring when an insulating material is subjected to electron irradiation in a scanning electron microscope (SEM) and next their consequences from both scanning electron microscopy and electron probe microanalysis (EPMA) points of view. When bare insula…