Materials Literature
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Two new homologous series, each consisting of 12 mesogens with isoamyloxy and isobutoxy branching terminal groups, have been synthesized, and their mesomorphic properties are studied. All the derivatives are mesomorphic in nature, with the lower members exhibiting nematic mesophase and the higher derivatives showing s…
Rapid thermal oxidation and quenching in liquid nitrogen (RTOQN) has been examined on anodized porous silicon (PS). The as-anodized PS samples exhibit a photoluminescence peak at 750 nm that decays instantaneously upon discontinuance of 325-nm He–Cd laser irradiation. In contrast, PS samples after RTOQN show a lumines…
The crystal structure of a newly synthesized compound Na2Ba2[B10O17(OH)2] has been determined (Syntex $$P\bar 1$$ diffractometer, MoK α radiation, 1784 crystallographically nonequivalent reflections, anisotropic approximation, R = 1.7%). The parameters of the monoclinic unit cell are a = 11.455(7), b = 6.675(4), c = 9…
A method for observing the liquid microstructure of beer has been developed to ascertain whether bubble nucleation is initiated from the beer itself. Observations were conducted under an electron microscope using specimens prepared by forming a thin-film replica of beer. Immediately after opening the bottle, microbubb…
The doped yttrium oxybromide (YOBr) phosphors were synthesized by a solid state reaction. The YOBr:Eu phosphor showed a strong and narrow red emission band at 621 nm and maximum emission intensity was obtained when 0.05 mol ion was doped. The luminescent properties of a YOBr:Eu phosphor were investigated by photolumin…
Three-layer structures made of concrete-type materials usually have an internal layer of a less strength, which serves as thermal insulation and makes the structure more light. Therefore cracks may appear in the internal layer of a bended structure earlier than in the external tensile layer. This paper deals with an i…
We formulate a novel method of characterizing optically transparent substances using dispersion theory. The refractive index is given by a generalized Cauchy dispersion equation with coefficients that are moments of the uv and ir absorptions. Mean dispersion, Abbé number, and partial dispersion are combinations of the…
We report observation of the dynamic enhancement of photorefractive effect in dye-doped nematic liquid crystal in the presence of an applied ac electric field. The multi-wave mixing efficiency in a planar cell with photoconductive orienting layers has been increased by two orders.
Heparinization is believed to be one of the methods to suppress thrombus formation on blood-contacting surfaces. However, this study hypothesizes that heparinization alone might not be sufficient to provide a blood-compatible surface; that is, a surface property that resists biofouling is necessary to obtain an effect…
Dynamically vulcanized poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) thermoplastic elastomers (TPEs) were prepared following a semi-efficient vulcanization system (semi-EV) with the incorporation of di-ethylhexyl phthalate (DOP) as a plasticizer. The PVC/ENR TPEs were melt mixed at 150°C and 50 rpm using a…
When welding onto an in-service pipeline, to facilitate a repair or to install a branch connection using the “hot tapping” technique, two risks need to be considered. The first is the risk of burnthrough, where the welding arc causes the pipe wall to be penetrated allowing the contents to escape. The second is the ris…
Two novel manganese(II) complexes, [Mn(phen)2N3·H2O]ClO4·H2O and Mn(phen)2(N3)2 have been synthesized by the reaction of Mn(ClO4)2·6H2O and Mn(CH3CO2)2·4H2O with NaN3 and phen in EtOH/H2O solution, respectively (where phen = 1,10-phenanthroline). Their crystal structures have been determined by X-ray diffraction. Both…
Abstract Raman scattering measurements were carried out for Fe 3 O 2 BO 3 and Ni 2 FeO 2 BO 3 ludwigite crystals in the temperature range from 15 to 300 K. At room temperature ludwigite has an orthorhombic structure belonging to space group $D_{2h}^{9}$ . Attempts made to record polarized Raman spectra were successful…
The general theory of continua with microstructure reviewed in [2] (and, in particular, the theory of gyrocontinua studied in [1]) is adapted to apply to perfect spin fluids and hyperuids [10]. Obvious changes are needed due to the prevailing interest for solids in [1] and to some extent in [2]; here, in addition, the…
As micro-actuator materials, TiNi shape memory alloy thin films with substrate are used more and more in MEMS field. The residual stress in Ti-rich TiNi thin films with silicon substrate prepared by the magnetron-sputtering technique is measured by both X-ray glancing and contour method. The influence of crystallizati…
A review with refs. concerning study of polyion counterion interaction by electrochem. methods is presented. [on SciFinder (R)]
We carried out molecular dynamics simulation of amorphous silicon nitride containing boron and carbon, in order to investigate the short-range atomic arrangement and diffusion behavior. In amorphous Si–B–N, boron atoms are in a nearly threefold coordinated state with nitrogen atoms, while boron atoms in amorphous Si–B…
Plates of both square and round geometries are tested to determine the strength and fatigue properties of ceramics under multiaxial stresses. The necessary tolerances required for accurate testing are not well documented in published literature. The stresses in square and round plates subjected to loading between conc…
A field-induced orthorhombic phase was observed on the (110) cub cuts in 0.68Pb(Mg 1/3 Nb 2/3 )O 3 -0.32PbTiO 3 (PMNT 68/32) single crystals by using a polarizing microscope and electrical measurements. It was found that the induced monodomain orthorhombic ferroelectric state is intrinsic metastable, whose phase stabi…
The method used to assess the reactivity of lime was evaluated to gauge it usefulness as a quality control tool. The effect of particle sizes, different lime and water masses for a fixed s:l ratio and the same for various s:l ratios on the reactivity values obtained, were investigated. An attempt to introduce the amou…