Materials Literature
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During secondary recrystallization of grain oriented silicon steel, isolated grains are often observed in secondary-recrystallized Goss grains (matrix). In an extraction experiment, the crystallographic relations between each isolated grain and the matrix were investigated. Although the Σ9 grain boundary against Goss…
To understand a void formation mechanism in electroplated Cu interconnects used for Si-ULSI (ultra-large scale integrated) devices, microstructures of Cu films which were prepared by the electroplating technique using plating baths with or without organic additives were investigated by transmission electron microscopy…
SUMMARIES The utility of polarised attenuated-total-reflectance (ATR) FTIR spectroscopy was investigated for the identification of cellulosic fibres and characterisation of their state of degradation. Turning the polariser so that the electric vector is parallel (Epll) or perpendicular (Eprp) provides a means of asses…
The multiple melting behavior and the associated crystalline forms of poly(hexamethylene terephthalate) (PHT) in PHT–clay hybrids were comprehensively analyzed using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and polarized-light microscopy (PLM). The intercalated morphology of the org…
By virtue of its spontaneous polarization (PS), a ferroelectric SmC* liquid crystal can be switched between two states corresponding to opposite molecular tilt orientations using an electric field, thus producing an ON-OFF light shutter between crossed polarizers. Considerable efforts have been made over the past deca…
Cathodoluminescence (CL) is the light that is emitted from a material irradiated by an electron beam. The present study was undertaken to show the applicability to biological studies of a scanning electron microscope (SEM) equipped with a high-sensitive cathodoluminescence detection system. For this purpose, we inject…
A novel cross-shaped porphyrin pentamer having four imidazolyl-porphyrinatozinc(II) moieties, one at each meso-position, was prepared. AFM measurements confirmed the formation of a large twodimensional porphyrin array structure: a thin layer of 6∼7 porphyrins was assembled over a 350 × 350nm2 area, representing linkag…
A previously developed 3D model 14 for the simulation of selective dissolution and passivation of alloys, based on a Monte Carlo method, has been expanded. The probabilities of dissolution used in the first model were set empirically as a function of the number of first nearest neighbors. In the present model the ener…
Precipitation behavior of intermetallic phases in ferrite matrix is investigated by transmission electron microscopy (TEM) in Fe-10Cr-1.4W-4.5Co (at%) alloys with and without 0.3 at%Si. It is intended to provide basic information for the alloy design of ferritic heat resistant alloys strengthened by intermetallic comp…
A new class of cage-like oligomers were selectively formed by hydrolysis and polycondensation of a methylene-bridged bistrialkoxysilane precursor in the presence of tetramethylammonium hydroxide, which led to the creation of novel silica-based hybrid materials.
For improving the understanding of molecular mobility through the glass transition, we compare results obtained by two dielectric techniques, dynamic dielectric spectroscopy (DDS) and thermo‐stimulated currents (TSC), for a series of amorphous model polymers, the poly(n‐alkyl methacrylates). This permits us to determi…
Corrosion inhibition properties of chemical and electrochemically synthesized polyaniline(PAni), poly-o-methoxianiline(POMA)and their copolymers, in form of coatings of stainless steel AISI 304 and aluminum alloy 6061-T6 are studied in 3%and 0.1 M NaCl solutions, respectively. Polarization curves showed that the prote…
The advancement of self-sealing ceramic matrix composites offers durability improvements in hot section components of gas turbine engines. These durability improvements come with no need for internal cooling and with reduced weight. Building on past material efforts, ceramic matrix composites based on either a carbon…
A series of tensile testing was carried out on the ultrafine grained 5083 Al alloy, which was fabricated by equal channel angular pressing (ECAP) with different ECAP strains, at low temperature superplastic (LTS) temperature of 548 K. This investigation was aimed at examining the effect of the ECAP strain inducing dif…
The full set of piezoelectric stress coefficients and the spontaneous polarization of ferroelectric Im2m sodium nitrite were calculated by first-principles quantum-mechanical methods. The Berry phase approach, implemented in the periodic LCAO computational scheme, was employed with an all-electron basis set and the Ha…
SUMMARIES Bleached softwood bisulphite and alum-rosin sized rag paper samples were subjected to conservation treatments with calcium hydroxide and with calcium hydroxide – methyl cellulose solutions. Accelerated ageing at 90ºC and 50% RH was done in order to evaluate the influence of these treatments on several paper…
Isothermal combustion experiments of coke pellet mixed with lime/limestone had been performed to investigate the effect of lime/limestone addition on the reduction of NO and SO2 emission. The coke pellets were combusted between 700°C and 1300°C under pure oxygen atmosphere. Combustion kinetics and conversion data of S…
Specific features of the test method procedure capable for determining the plasticity characteristic dH by indentation of inhomogeneous coatings affected by residual stress was clarified. When the value of the plasticity characteristic for coating was found to be as great as dH > 0.5 a simplified model was found to…
A novel modified poly(dl-lactic acid) (PDLLA) was obtained by covalently grafting of maleic anhydride onto the backbone of PDLLA, attempting to improve PDLLA's hydrophilicity and cell affinity and to provide reactive groups for further chemical modification. FTIR, ^13 C NMR and DSC were used to characterize the maleic…
During the launch of the Space Shuttle Columbia on January 16, 2003, foam originating from the external tank impacted the shuttle's left wing 81 seconds after lift-off. Then on February 1st, Space Shuttle Columbia broke-up during re-entry. In the weeks that followed, the Columbia Accident Investigation Board had forme…