Materials Literature
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The commensurate and incommensurate structural configurations underlying the diffuse scattering from athermal {omega} found in the as-quenched {beta} phase of Ti with 8 and 15 at. % Mo have been investigated by high-resolution electron microscopy. Image interperetations were based on a simulation code developed via ob…
Measurement of dose or dose perturbation factors at high atomic number interfaces are usually performed with a thin-window parallel-plate ion chamber. In a transition region, under nonequilibrium conditions, accuracy of ion chamber readings for the dose measurements has often been questioned. This paper critically ana…
Polypropylene films were tested for lifetimes under high electric fields, using both constant and step-stress methods. Various time intervals for the step-stress test and voltages for the constant stress test were selected. The inverse power law was used in the analysis of the experimental data, with the value of the…
The purpose of this paper is to establish the environmental indicators for reconstruction of freshwater paleoenvironments. Living diatom materials were collected from rivers, lakes, marshes, high moors and lands. Therefore, diatom species were classified on the basis of habitats, as follows.1. Indicator species of the…
Abstract Thermal degradation of functionally terminated liquid polybutadiene polymers, carboxy‐terminated polybutadiene (CTPB), hydroxy‐terminated polybutadiene (HTPB), and poly(butadieneacrylonitrile‐acrylic acid) terpolymer (PBAN) and their cured analogues were studied by pyrolysis gas chromatography in the temperat…
Tissue grafts from a histoincompatible donor of the same developmental stage were introduced into an early chick embryo host in order to probe the immune response to the graft after birth, when the host has reached immune maturity. Limb buds from B4 or B12 chicken strains were grafted in situ on (B15 x B21)F1 recipien…
"One kilowatt per capita." Bulletin of the Atomic Scientists, 46(1), pp. 13–14
A methodological improvement is proposed for increasing the accuracy of the standard Raman spectroscopic method for the determination of the phase distribution in semicrystalline polyethylene (PE). A computer-assisted least-squares decomposition of the overlapping Raman bands, using analytical band shapes, is applied…
Abstract Ozonization is a very efficient, economical, and potentially practical method to modify polypropylene (PP) as well as polyethylene (PE) surfaces. Carbonyl, carboxyl, and hydroperoxide groups can be very conveniently generated by reacting these polymers with ozone. In the case of fibers and powders, surface tr…
Orientation dependence of twinning in commercially pure titanium was determined in both single crystals deformed in tension or compression and polycrystals deformed in tension. {\bar1012} and {11\bar22} twins in single crystals, and {\bar1012}, {11\bar21} and {11\bar22} twins in polycrystals occurred depending on the…
3a: 2a (0.24 g, 1 mmol) was added to a solution of la (0.41 g, 1 mmol) and NaPF, (0.18 g, 1 mmol) in 20 mL of dry methanol. The solution turned violet after a few minutes and then progressively dark red. The mixture was stirred for 20 hat room temperature. The solvent was removed in vacuo and the red solid was dissolv…
The crystal structures of CdAl 2 S 4 , HgAl 2 S 4 , and HgGa 2 S 4 were solved and refined to R = 0.032, 0.042, and 0.046, respectively. CdAl 2 S 4 and HgGa 2 S 4 crystallize with the thiogallate type structure, space group I [unk]. The positional parameters of S are x = 0.2660(1), y = 0.2770(1), z = 0.1352(1) for CdA…
Intercalation compounds between a layered double hydroxide and an anionic dye were directly synthesized by hydrolysis of mixed solutions of aluminium nitrate, magnesium nitrate, and the anionic dyes (indigo carmine or new coccine). The intercalated indigo carmine anions are possibly arranged with their molecular plane…
Microcapsules containing phenobarbitone were prepared from poly(L-lactic acid), using a water/oil emulsification and evaporation process. Polymers of three different molecular weights were used. Particle size was found to increase with an increase in core loading and polymer molecular weight. Release studies were carr…
Abstract The mineralogy of Vertisols and Mollisols, associated in a hydrotoposequence in the western part of the phosphate plateau of Morocco (High Chaouia), was studied using x‐ray diffraction, interlayer swelling with alkylammonium cations, chemical analysis, and infrared spectroscopy. The swelling behavior of Li‐ a…
The substituent effect on the thermal properties of smectic A phase for two related compounds; 4-octyloxybiphenyl-4-yl 4-Y-benzoates and 4-Y-phenyl 4-octyloxybiphenyl-4′-carboxylate with Y = N(CH3)2, OH, OCH3, CH3, C6H5, SCH3, H, CHO, halogens, COCH3, SO2CH3, CO2CH3, CN and NO2, has been examined. The smectic A–nemati…
Road accidents are a significant source of community costs associated with transport operations. More than a quarter of all wet-road accidents in the United Kingdom are related to skidding conditions, conditions which could be avoided if road surface conditions were monitored routinely and remedial treatment undertake…
alpha -Fe/sub 2/O/sub 3/, gamma -Fe/sub 2/O/sub 3/, and alpha -FeOOH powders were used as starting materials to prepare barium hexaferrite hydrothermally. Since strontium hexaferrite and lanthanum-doped calcium hexaferrite have coercivities similar to that of barium ferrite, the hydrothermal synthesis of strontium hex…
Abstract Sudden changes of compressive strain‐rate on glassy poly(methyl methacrylate) lead to the conclusion that the post‐yield state under a constant stress is a state of steady flow in the polymer. Non‐linearity between the stress divided by temperature and the logarithm of strain rate for this steady plastic flow…
Reaction of H2oep (oep = dianion of octaethylporphyrin) with two equivalents of LiN(SiMe3)2 in tetrahydrofuran (thf) yields the dilithium salt [Li(thf)4][Li(oep)], characterized in the solid state by X-ray crystallography; in solution, 7Li NMR and conductivity measurements show a more complex, solvent-dependent struct…