Materials Literature
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An adiabatic scanning calorimeter has been used in a calorimetric investigation of alkyl-cyanobiphenyl (nCB) liquid crystals. Measurements near solid to smectic (KA), smectic A to nematic (AN) and nematic to isotropic (NI) or smectic A to isotropic (AI) phase transitions have been carried out for scanning rates as low…
An organic polymer Kapton H film was irradiated with high-energy (∼MeV) N+2 ions. The specific resistivity of the film irradiated to a dose ∼1017 N/cm2 was estimated to be ∼10−2 Ω cm, which is about 20 orders of magnitude smaller than that of the unirradiated film. With increase of dose, the irradiated region of the f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrophase structure of solvent-cast diblock copolymers and copolymer-homopolymer blends containing spherical microdomainsFrank S. Bates, C. V. Berney, and R. E. CohenCite this: Macromolecules 1983, 16, 7, 1101–1108Publication Date (Print):July 1, 1983Publication History Pub…
Birefringence in three orthogonal directions was determined at normal incidence by the compensator method on thin sections of cellophane sheets, before and after subjecting them to swelling and stretching treatments. Considerable increase in crys tallinity and longitudinal orientation of molecular chain axes was achie…
Mechanically blended powder of UO2, PUO2 and graphite and its compact were heated in a vacuum to have some informations on the formation of mixed carbide (U, Pu)C. It was experimentally confirmed that PUO2 was reduced to sesquicarbide without forming a solid solution with UO2 in the reduction process. Larger quantity…
Abstract Considerable work has been published on the subject of filling reaction injection molded (RIM) polyurethane elastomers with discontinuous particulate fillers such as milled glass fibers, flake glass and wollastonite, RIM polyurethane elastomers are filled for three reasons: (1) to increase stiffness, (2) to d…
Short sediment cores (ca. 40 cm long) were collected from three locations within Kootenay Lake, B.C., and the occurrence of diatoms within the cores was recorded and analyzed. This analysis of fossil diatoms in the sediments of Kootenay Lake has provided evidence for environmental change as a result of man's activitie…
Previous studies have been conducted by using tritium to identify the areas to which hydrogen segregates in steels. Most of these studies were conducted with stainless alloys or steels coated with barrier films on the surface to avoid the loss of optical resolution due to the formation of corrosion products from the p…
Abstract The tensile behaviors of polystyrene (PS), poly(styrene/acrylonitrile) (SAN), high‐impact polystyrene (HIPS), and poly(acrylonitrile/butadiene/styrene) (ABS) were examined systematically in the wide range of strain rate, 1.7 × 10 −4 –13.1 m/s. When glassy and brittle PS was a criterion, the incorporation of a…
The annealing and fading characteristics of CaF2:Tm (TLD-300) have been investigated. The best annealing temperature and time are given. The thermal treatment after exposure and before read out has also been studied. This work also reports the results of studies on fading in dark and light conditions. The stability of…
Abstract Infrared spectroscopy (4000–50 cm −1 ) was used to characterize the two crystalline modifications of poly(p‐phenylene terephthalamide). Polarized studies revealed that hydrogen bonds are oriented primarily perpendicular to the film plane in both forms. We also found that the crystalline modification coagulate…
Magnetometer surveys above gas pipelines show stress induced magnetic anomalies at pipe bends. This suggests a potential technique for the noninvasive monitoring of stress in buried pipelines, etc. Laboratory measurements of the magnetic field changes due to the elastic bending of 110 mm diameter pipe are presented. T…
Abstract A method has been developed for extracting the clay fraction from soil samples and using it for soil color comparisons. A syringe press has been constructed to aid the procedure.
For the complete nuclear fuel cycle, the development of a process for the co-conversion of Pu-U nitrate mixed solutions to mixed oxide powder has been performed along the line of non-proliferation policy of nuclear materials. A new co-conversion process using a microwave heating method has been developed and successfu…
Abstract Reactions of Ni(CH3)2(bpy) (1), Ni(C2H5)2(bpy) (2) (bpy=2,2′-bipyridine), trans-Ni(CH3)2(triethylphosphine)2 (3), Ni(CH3)2(1,2-bis(diphenylphosphino)ethane) (4), and Ni(CH3)2(1,3-bis(diphenylphosphino)propane) (5) with alkyl or aryl halides, R′COY (Y=Cl, Br, OC6H5, OCOC6H5), and CS2 have been investigated. Th…
Heat conduction is considered in a semi-infinite solid subjected to a high step change in surface heat flux, such that melting occurs. A time-dependent relaxation model for the energy flux is assumed, leading to a non-Fourier, non-linear equation for the thermal field, which is solved under suitable conditions on the…
The dynamic structure factors of crystals with sublattices which are mutually incommensurate are examined. The sublattices may be individually ordered, but incommensurate, or only one may be ordered with an interpenetrating fluid of the second atomic species. At high frequencies there are two propagating longitudinal-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structures of 2,11-dithia- and 1,3,10,12-tetrathia[3.3](2,6)-pyridinophanesGeorge R. Newkome, Sebastiano Pappalardo, and Frank R. FronczekCite this: J. Am. Chem. Soc. 1983, 105, 15, 5152–5153Publication Date (Print):July 1, 1983Publication History Publi…
Abstract Blepharida sacra (Weise) is one of many species of flea beetles that have remarkable jumping abilities. The energy for its prodigious leaps is evidently stored in a central scroll‐shaped organ inside the hind femur of this insect—the metafemoral spring. X‐ray diffraction, scanning electron microscope, and ana…
Summary On-going field scaling tests have provided a unique opportunity to study how strontium sulfate and calcium sulfate scales are formed in an oil-producing well. Results indicate that development of nucleation sites on tubing surfaces is the most critical step. Scale profiles within a wellbore are determined main…