Materials Literature
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The rotational viscosity coefficients γ1 are measured with the rotating field method as a function of temperature in the nematic phases of 4-methoxybenzylidene-4′-n-butylaniline, 4-n-pentyl-, and 4-n-octyl-4′-cyanobiphenyl, of the eutectic mixture of two 4-n-pentylphenyl 4-alkoxybenzoates and of the eutectic mixture o…
Radiation of 193-nm (ArF excimer laser) wavelength can cause the etching of surfaces of poly(ethylene terephthalate) (PET) films in a controlled manner without any subsequent processing. Etch rates of 1200 Å/pulse of 370 mJ/cm2 were realized in air. The reaction can be attributed to (ijk) the high absorption cross sec…
A strong dependence of the intensity of the thermoluminescence (TL) output of peaks 5 (208 degrees C), 7 (266 degrees C) and 10 (422 degrees C) on temperature (T irr ) (in the range 25-295 degrees C) at which the phosphor samples were irradiated was observed in LiF (TLD-100) in the dose range covered by the authors (1…
Measurements of the dielectric constant and pyroelectric coefficient of alpha -nylon 11 have been carried out in the temperature range from -20 degrees C to 120 degrees C. The temperature dependence of both the dielectric constant and pyroelectric coefficient was found to correlate with an anomalous temperature depend…
A non-equilibrium, two-phase model for a plane, one-dimensional system is used to calculate the pressure and cavitation development in water containing free gas as cavitation nuclei. Two cases are considered, (i) the field between a vibrating horn and a stationary specimen which is placed at a small distance from the…
The authors discuss the theory of preferred orientation, determined by Mossbauer spectroscopy using unpolarised dipole radiation in the case of axial hyperfine interaction. A previous expansion of the texture function D( theta , phi ) in a series of spherical harmonics, involving five independent parameters, can be re…
The temperature dependence of relaxation mechanisms in solids are examined and compared with experimental observations. Evidence is presented for thermally activated processes, quantum mechanical tunnelling relaxation, thermally activated tunnelling and critical behavior relaxation. It is shown that the Williams-Lande…
Abstract Block copolymers of butadiene and styrene containing 21 and 61 wt.‐% styrene as well as pure polybutadiene have been investigated with respect to the extent of crosslinking produced by the irradiation with 60 Co γ‐rays. The free radical yield at 77 K, G (R.), has also been measured. Addition of the styrene bl…
Abstract The carbonation reactions of polymeric organolithium compounds with high purity, gaseous carbon dioxide have been investigated in benzene and benzene/tetrahydrofuran (75/25) solutions. The polymers investigated were poly(styryl)lithium, poly(isoprenyl)lithium, and poly(styrene‐ b ‐isoprenyl)lithium. In Benzen…
Abstract Two kinds of N ‐thiocarboxyanhydrides of D,L ‐L and D,L ‐L were synthesized, 5‐oxo‐2‐thioxo‐1,3‐oxazolidones 1a, 1b and 1,3‐thiozolidine‐2,5‐diones 2a, 2b . Their polymerizations were conducted at 20°C with primary, secondary, and tertiary amines or with potassium tert ‐butylate as initiators. The tacticity o…
Abstract Die Phenol‐Formaldehydharzverteilung im Cellulosepapier (Baumwollinters 90 g/m 2 ) wurde mittels Licht‐und Rasterelektronenmikroskopie im Zusammenhang mit der Plasmaätztechnik untersucht. Mit steigender Viskosität der Harzlösungen nimmt im untersuchten Meßbereich die Ausfüllung der Faserzwischenräume und der…
B T Kelly 1981 London: Applied Science Publishers x + 477 pp price £48 Graphite is a material of increasing technical importance, used as a moderator in nuclear reactors, electrodes and rocket nozzles, and this book describes the physics behind the technology. There are chapters on mechanical, thermal and electronic p…
The nature and composition of the mineral deposition, which occurs in the form of a characteristic band in the freshwater green alga Gloeotaenium loitlesbergarianum Hansgirg was studied using microchemical tests and spectroscopic analysis. Calcium carbonate was found to be the principal component of the band. Strontiu…
Abstract The effect of four different types and concentrations of plasticizers on some physical properties of poly(vinyl chloride) (PVC) has been studied. DOP, DOA, TTP, and Hex were used as plasticizers in concentration levels of up to 24% of PVC weight. The plasticized and unplasticized PVC were processed into sheet…
(1982). Murunskite, K2Cu3FeS4, a new sulfide of potassium, copper, and iron. International Geology Review: Vol. 24, No. 9, pp. 1109-1114.
The prompt and delayed emission spectra of a biphenyl host with naphthalene and pyrene both as guests mixed crystal have been studied. The fluorescence of naphthalene and pyrene and the excimer fluorescence of pyrene have been observed. The delayed emissions are observed from pyrene and naphthalene as delayed fluoresc…
Abstract Field observations of lubricant type and level control are presented with the intent of promoting laboratory routes to developing better rigid formulations. Calcium stearate is identified as a gelation promoter. PE wax is described as a very effective gelation retarder. POPE is an effective slip agent, ineffe…
Abstract Core samples of the Cenomanian glauconitic sediments from the Great Burgan oil field, Kuwait, display important mineralogical changes both under surface and subsurface conditions. Unconformities can be demarcated with confidence by studying the chemical weathering of unarmored glauconite which results in the…
We analyze the current‐voltage behavior of a photoelectrochemical cell assuming that its equivalent circuit consists of a photodiode in series with an electrochemical cell. One of the two cell electrodes is controlled by mixed mass and charge transfer. The model is restricted specifically to noninteracting photo and e…
The effect of Cl and SO2-4, anions as well as that of the ionic strength on the desorption of soil P were studied in 102 mineral soil samples by extracting them with KCI and K2SO4 solutions at ionic strengths of 0.025 and 0.1. The quantities of salt soluble and water soluble P in the soils were compared. Both sulphate…