Materials Literature
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A calcium hexaluminate (CaAl 12 O 19 , magnetoplumbite structure) sol was used to coat alumina and yttrium‐aluminum‐garnet (YAG) single‐crystal fibers and single‐crystal alumina plates. When the coated substrates were either annealed or hot‐pressed in polycrystalline alumina and YAG matrices, the calcium hexaluminate…
Solutions to problems involving the scattering and guiding of waves by multilayered grating configurations can be phrased in rigorous modal terms. We show that such a modal solution can be represented by electrical transmission-line networks, which are generalized forms of simpler conventional circuits. This approach…
carolyn BRODIN, B\"ORJESSON, ENGBERG, TORELL, AND SOKOLOV RELAXATIONAL AND VIBRATIONAL DYNAMICS IN... The structural relaxation behavior of a strong glass former ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ has been investigated over broad temperature (300--1275 K) and frequency (0.5 GHz--10 THz) ranges using depolarized ligh…
Unilamellar liposomes that retain their contents in the systemic circulation can alter the pharmacokinetics of anticancer agents in favorable ways. It has long been recognized that certain liposome compositions may increase the local drug concentration substantially above that achievable with a free drug. We report he…
Diamond is the most suitable material for many experimental methods in nanoprobe microscopy and materials testing. The extreme hardness, the high Young’s modulus, the inert nature of the surface, and the electrical conductivity obtained through doping make this material particularly attractive. We have coated silicon…
The ring diameter of ring‐like distributed oxidation induced stacking faults (OSF) in Czochralski grown silicon crystals has been investigated as a function of pull rate and the calculated axial temperature gradient G at the solid/liquid interface of the growing crystals. It is shown that the radial position of the OS…
Polyhydric alcohols, i.e., ethylene glycol, glycerol, propylene glycol, 1,3-propanediol (trimethylene glycol), and polyethylene glycol (200 and 400), were investigated for their plasticizing effects on soy protein plastics. Tensile strength and percentage elongation at break of compression-molded soy protein specimens…
In recent years a number of hyperthermophiles with the ability to utilize sugars as source for carbon and energy have been isolated. Analysis of their central metabolism may reveal adaptations to the extreme environment, or give information about the evolution of the primary pathways involved. The best studied represe…
Alumina trihydrate is an effective and widely used fire retardant and smoke suppressant, with several other incidental advantages, but it usually lowers the mechanical strength of thermosetting resins and laminates. This paper reports the extent of the reduction in the impact damage tolerance of glass-epoxy woven rovi…
This paper describes recent results of research on organic materials, especially organic photopolymers for opto-electronic devices, which are contributing to the realization of the “Multimedia World” in the 21st century. For this purpose two photoactive polymers were developed for Gbit-scale dynamic random access memo…
The Crystallographic Information File (CIF) uses the self-defining STAR file structure. This requires the creation of a dictionary of data names and definitions. A basic dictionary of terms needed to describe the crystal structures of small molecules was approved in 1991 and is currently used for the submission of pap…
The addition of metallic fillers is recognized to impart improvement of acoustic properties to polyurethane-based materials used for marine applications. The system under consideration was obtained by the reaction of a triisocyanateterminated prepolymer with 1,4-butanediol, in the presence of various concentrations of…
Conventional rigid polyisocyanurate (PUIR) foams blown with HCFC-141b often suffer from poorer compressive strengths, dimensional stability and inferior flammability properties when compared to foams blown with CFC-11. It is often hypothesized that these properties can be improved by increasing the isocyanurate (or "t…
Abstract Mineral fillers have been used very often in the past for improving elastic modulus and temperature resistance of polyolefines, also to the detriment of impact resistance. Very recently it has been pointed out that good fracture toughness can be achieved if an appropriate mechanism is stimulated and a good bo…
Abstract The miscibility of isotactic polypropylene (PP) in blends with (a) polystyrene‐ block ‐poly(ethylene‐ stat ‐butylene)‐ block ‐polystyrene (SEBS) and processing oil, (b) poly(ethylene‐ co ‐propylene) (EPM), and (c) EPM and processing oil, has been studied using the method of melting‐point depression. Near equi…
The popular assumption that all salts are totally ionized in aqueous solution is false. Moreover, it is approximated only by alkali metal salts and by salts of alkaline earth metals with high atomic numbers.
Diffusion of the aroma compounds p-cymene and acetophenone into three different packaging films was studied at 500 MPa for kinetic measurement, and in the range of 0.1–450 MPa for measurement of the diffusion rate as a function of pressure. Absorption of aroma compounds was lower in pressurized than in nonpressurized…
The morphology of fullerene networks can be widely extended by introducing heptagonal or octagonal rings, which produce a Gaussian negative curvature. Their presence makes it possible to form donut-, coil- and sponge-shaped networks of carbon atoms. We discuss the geometry of the polymorphous forms based on the net di…
Wholly aromatic polybenzimidazoles were synthesized from aromatic tetraamines and difunctional aromatic acids and characterized as new thermally stable polymers. The melt polycondensation of aromatic tetraamines and the diphenyl esters of aromatic dicarboxylic acids was developed as a general procedure of wide applica…
The magnetoelastic properties of steel wires are used for measuring a mechanical load in tension. A microcomputer-controlled measuring instrument was designed. The dependence of magnetic behaviour on a previous state is eliminated by the suggested method of commutated measurement of amplitude permeability from saturat…