Liquid crystalline hydrogen‐bonded complexes formed between alkoxystibazoles and phenols
Abstract Mesomorphic materials formed by hydrogen bonding between 4‐alkoxystillbazoles and some phenols are described.
Materials Literature
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Alumina/Aluminum Composites Formed by the Directed Oxidation of Aluminum Using Magnesia as a Surface Dopant
Al 2 O 3 /AI composites have been formed by the directed oxidation of pure Al doped with MgO powder. Thermal gravimetric analysis was used to characterize reaction kinetics. Optical and scanning electron microscopy and SEM coupled with microanalysis were used to characterize the microstructure of product. Directed oxi…
Microstructural Design of Advanced Multi-Step Three-Dimensional Braided Preforms
The "multi-step" braiding process is introduced as an extension to the four-step braiding process. This process greatly enlarges the possibilities of braid micro-structures. An assumed yam packing arrangement within the braided preform and geometric considerations were used to relate yam orientation to non-dimensional…
Determination of the structure of the cubic phase in high-ZrO2Y2O3-ZrO2alloys by convergent-beam electron diffraction
Convergent-beam electron diffraction (CBED) was used to determine the space group of 9·9 and 18 mol.% Y2O3-stabilized cubic ZrO2 single crystals. The result (space group, 43m) is different from the known tetragonal structure (space group, P42/nmc) present in lower solute (3·2 mol.% Y2O3) alloys, and the cubic structur…
Electrically Controlled Light Scattering of the Aerosil-Liquid Crystal System
Optical and electro-optical characteristics of a silica suspension in a liquid crystal were studied. Their possible applications in different electro-optical devices are analyzed.
Rubbing test responses of the skin to man‐made mineral fibres of different diameters
The irritant potency of 5 types of insulation wools (2 types of rockwool and 3 types of glasswool) were studied on the basis of their differences in diameter by a standardized rubbing test. Assessment was done by laser Doppler flowmetry (LDF) and erythema scores. Insulation wools show a wide distribution of the diamet…
Localization Analysis of Nonlocal Model Based on Crack Interactions
The conventional nonlocal model, often used as a localization limiter for continuum‐based constitutive laws with strain‐softening, has been based on an isotropic averaging function. It has recently been shown that this type of nonlocal averaging leads to a model that cannot satisfactorily reproduce experimental result…
Poling behaviour of ceramic/polymer ferroelectric composites
Composite materials made from Calcium modified Lead Titanate grains embedded in a copolymer matrix of poly(vinyledene fluoride trifluorethylene) have been produced in order to optimise their pyroelectric and piezoelectric properties. The resulting coefficients are dependent both on the electrical, mechanical and therm…
Ferroelectric phase transitions in IV-VI semiconductors associated with off-center ions
New ferroelectric phase transitions were found in ternary and quaternary solid solutions of IV-VI semiconductors. Their analysis shows that offcenter ions play important role in the appearance of ferroelectricity in these crystals.
A Phosphorus-Bromine Flame Retardant for Engineering Thermoplastics—A Review
A brominated phosphate was evaluated as a flame retardant in a polycarbonate and various polycarbonate blends. This flame retardant was found to be significantly more effective than an all-bromine and an all- phosphorus flame retardant, and bromine-phosphorus synergy was demon strated. The synergy is more pronounced w…
Dynamic Mechanical Analysis of Glass Mat-Reinforced Polypropylene (GMT-PP)
DMA spectra were taken from tensile loaded neat and glass-fiber mat- reinforced polypropylene (GMT-PP) with different reinforcement fractions ( V f ). Reliable data were achieved by using rectangular specimens of proper dimension, i.e., having a clamped surface of 60 x 15 mm 2 . It was established that the β- or T g -…
Electrical characteristics of polypyrrole composites at microwave frequencies
Abstract The microwave absorption and reflection characteristics of composites of polypyrrole with paper, cotton cloth and polyester fabrics have been evaluated. Refiectivity measurements in the range 2–18 GHz and plane wave modelling have revealed impedance charateristics with a common transition rgion. Relationships…
Model for water outgassing from metal surfaces. II
The outgassing rate from an electropolished stainless steel (type 304) surface is measured after the surface is exposed to H2O vapor at pressures (p0) of 10−3–10 Torr for exposure periods (t0) of 3–600 min. The system is kept at 310, 350, or 390 K during H2O exposures and subsequent outgassing measurements. Our data s…
Effect of uniaxial stress on the reversible and irreversible permeabilities of 2% Mn pipeline steel
The results of a study of the effects of constant uniaxial stress on the irreversible and reversible differential permeabilities of minor and saturation major hystersis loops are presented, extending an earlier study which studied those permeability components on the initial magnetization curve. Tension was found to i…
Studies on the transesterification of polycarbonate/poly(ethylene terephthalate) blends. II: Effect of transesterification on the compatibility and crystallization behaviour of the blends
Abstract The effect of transesterification on the compatibility of polycarbonate poly(ethylene terephthalate) (PC/PET) blends and the crystallization and melting behaviour of PET was studied. The results show that with increase of the reaction extent, the compatibility of the blends was enhanced during melt‐processing…
A method for the determination of nitrogen in clays, with application to the burial diagenesis of shales
Abstract A new operationally defined method for the measurement of fixed inorganic nitrogen (N fix ) associated with clays has been tested and applied to a sequence of mixed-layer illite/smectite (I/S) (ranging from 40 to 68% illite in I/S) in shales from a drill site in Terrebonne Parish, Louisiana. This new method h…
Structure and Properties of (Ba,Ca)TiO 3 Ceramics Prepared Using (Ba,Ca)CO 3 Precursors: II, Diffuse Phase Transition Behavior
Ferroelectric phase transition in (Ba,Ca)TiO 3 ceramics has been investigated using dielectric measurements. It is shown that samples prepared using (Ba,Ca)CO 3 , precursors exhibit diffuse phase transition (DPT) while those prepared by the conventional route show BaTiO 3 ‐type sharp transition. The diffuseness of the…
Crystallogenesis of biological macromolecules: facts and perspectives
This paper gives an overview of the science of crystals of biological macromolecules. The historical background of the field is outlined and the main achievements and open problems are discussed from both biological and physical-chemical viewpoints. Selected results, including data from the authors, illustrate this ov…
On the anisotropic migration of point defects in h.c.p. zirconium
Point-defect calculations in h.c.p. zirconium have been carried out with a pair potential constructed in terms of the generalized pseudopotential theory. Two models of the h.c.p. lattice with either the ideal or the experimental c/a ratio were considered. It has been found with both models that the monovacancy has the…
Friction and Wear Properties of Chemomechanically Polished Diamond Films
The role of surface roughness on the coefficient of friction and wear of polished CVD diamond films has been investigated. Diamond films grown on single crystal silicon (001) substrates by Hot Filament Chemical Vapor Deposition (HFCVD) process were polished by a chemomechanical process in which a diamond film was poli…