Materials Literature
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The corrosion inhibition of mild steel, in 3 % NaCl solution of pH3, by amphoteric surfactants was evaluated in absence and in presence of 600 and 1200 mg H2S/l and at temperatures of 25, 40 and 65°C. These surfactants have the general formula. The presence of surfactants in the aqueous solution affected both the cath…
The fluorescence behavior of 1,1′-dimethyl-2,2′-carbocyanine and p-N,N-dimethylamino-styryl-2-ethylpyridinium was investigated in several epoxy systems. Time-correlated single photon counting was used for all fluorescence measurements to obtain the rate constant for viscosity or mobility-dependent nonradiative process…
This paper establishes the dependence of the velocity of the self-consistent motion of the foci of inhomogeneous plastic deformation on the strain-hardening coefficient during the stretching of single-crystal γ Fe. It is shown that the relationship between the velocity and the indicated quantity is inversely proportio…
Fractal geometry is used to evaluate the irregularities of crimped filament yarns. To measure the fractal dimension of textured filament yarns, methods based on the box counting dimension, the compass dimension, and the equipaced dimension are applied to digital images of the textured filament yarns, obtained using a…
Auramine O was investigated as inhibitor for the corrosion of mild steel in 1.0 M solution of various (sulphuric, hydrochloric, perchloric and phosphoric) acids by studying weight loss, polarisation curves and using electron spectroscopy for chemical analysis technique. Various corrosion parameters such as Tafel slope…
The kinetics of the thermal decomposition of poly(vinyl chloride) (PVC) was studied by a conventional thermogravimetric technique under various heating rates in a flowing nitrogen. The kinetic model that accounts for the ef fects of scission of the polymeric chain at any time was proposed to describe the thermal decom…
Heat capacities of ${\mathrm{La}}_{2}{\mathrm{NiO}}_{4+\ensuremath{\delta}}$ crystals were measured in the temperature range 14--400 K and composition range $0.047<~\ensuremath{\delta}<~0.116$ with an adiabatic calorimeter. Heat capacity anomalies were observed in the range 230--300 K due to positional order-dis…
Cordierite‐based dielectric thick films deposited by screen‐printing on a Cu 2 O‐Cu‐96% alumina substrate were investigated with regard to microstructural characteristics, densification, and crystallization. Compared to direct deposition of the cordierite layer on metal Cu, the use of the Cu 2 O layer as a diffusion b…
has illustrated the power of crystallography in dening the three-dimensional structures of complex macromolecular assemblies. Such assemblies, usually involving several components, appear to regulate most cellular processes, including membrane receptor responses, redox processes, cell signalling, the cell cycle, DNA r…
Single crystals of rare earth orthovanadates, doped with active elements, have been obtained for the first time by a hydrothermal method. In spite of the fact that these rare earth vanadates have high melting points (> 1800 degrees C) and very low solubility, the authors have obtained these rare earth orthovanadates u…
Abstract The alignment photocontrol of liquid crystalline polymer films was achieved by a thin film of a polymethacrylate with p-cyanoazobenzene side chains as a command layer, which was exposed to linearly polarized light in advance.
Binary melt-blended mixtures of two aryl ether ketone polymers (i.e., a new poly(aryl ether ketone) (code name PK99) and poly(ether ether ketone) (PEEK), have been studied. Polymer miscibility in glassy amorphous (or melt) domains has been demonstrated for the binary blend comprising of two aryl-ether-ketone-type semi…
ABSTRACT A new Line Intersection (LI) procedure for determining sterilization value (F o ) and quality or nutrient retention (cook value: C o ) was developed using the original Equivalent Point Method (O‐EPM). Analysis of 30 conventional and 5 simulated thermal curves showed excellent agreement between F o values dete…
Both the energy losses of π electron plasmon and valence electron plasmon in polycrystalline graphite have been measured by reflected electron energy loss spectroscopy (REELS). It was found that when crystallites are smaller than 10 nm, the π plasmon energy is lower than the value estimated from the valence plasmon en…
This brief report (i) presents equations that govern the balance of tangential forces in interfaces between isotropic viscous fluids and nematic liquid crystals, and (ii) establishes the physical origin of nematic Marangoni flows. It is shown that surface gradients in the orientation dependent surface free energy give…
Grain-boundary impurity diffusion of Au along the incoherent twin boundary in a diffusion-bonded Cu bicrystal has been studied by the serial sectioning technique. The measured penetration profiles had a rather atypical shape which we interpreted in terms of structural multiplicity of the grain-boundary structure. A me…
Correlation between the shape of Raman, photoluminescence (PL) and Electron Spin Resonance (ESR) signals in CVD diamond films was examined for both undoped and nitrogen-doped films. No correlation was observed between the shift of the diamond Raman line and its linewidth, even for the films produced under essentially…
The phase assemblage formation resulting from hydration of a tetracalcium aluminoferrite (ferrite) powder (4CaO·Al 2 O 3 ·Fe 2 O 3 ) was investigated by isothermal calorimetry, X ray diffraction analyses and scanning electron microscopy (SEM). Hydration of the ferrite powder was carried out isothermally at 50°C in 1·0…
Mixed radioactive and chemical wastes stored in tanks across the DOE complex generate hydrogen, ammonia, nitrous oxide, and nitrogen by a complex series of radiolytic and thermolytic reactions. Flammable conditions may result when these gases accumulate in the dome space of the waste tanks. A phenomenological model wa…
The transformation of X‐phase SiAlON (a composition of approximately Si 3 Al 6 O 12 N 2 ) to 3/2 mullite (3Al 2 O 3 ·2SiO 2 ) plus vitreous silica (SiO 2 ) at temperatures >1200°C has been studied in polycrystalline ceramics via transmission electron microscopy. The transformation of X‐phase SiAlON to mullite is ob…