Materials Literature
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A theoretical description of the inelastic interactions of electrons with solid polystyrene is presented. The response of the valence electrons to energy and momentum transfers is determined by a model insulator theory; carbon K-shell ionization cross sections are derived from atomic, generalized oscillator strengths.…
Abstract The thermal degradation of ammonium polyphosphate (APP), a commercial fire retardant, and its blends with poly(methyl methacrylate) (PMMA) have been studied by thermal volatilization analysis (TVA) and the degradation products identified. APP degrades under vacuum in three stages. Initially it condenses to an…
The turnover of total collagen in several tissues of 12-week-old normotensive and hypertensive rats was estimated by using tritium-labeled proline as a precursor. The effect of reutilization of the label was minimized by treatment with large doses of unlabeled proline subsequent to administering the radioactive imino…
\n\t\t\t\t\tRefractive indices have been measured throughout the nematic phase of 4-n-pentyl-4'cyanobiphenyl (5CB) and the smectic A and nematic phases of 4-n-octyl-4'-cyanobiphenyl (8CB). The Vuks and Neugebauer methods of calculating the order parameter are compared. Without knowledge of the molecular polarisabiliti…
Experimental studies have been carried out using crevices of Type 316 stainless steel freely exposed in chloride solutions. The characteristic behaviour of corrosion potential with time, together with morphological evidence, indicates a mechanism in which an induction period precedes the permanent breakdown of passivi…
An extensive survey of the Raman spectral activity of a wide variety of carbon materials has produced experimental evidence for at least five structure‐sensitive lines or bands. In addition to the well‐known, always present 1580 cm −1 graphite line and the 1360 cm −1 disordered carbon line, there is a disorder line at…
Qualitative results of an x-ray photoelectron and optical investigation of three thin-film transition-metal oxides, namely, WO3, MoO3, and V2O5 are reported. Data were obtained on films that were not colored and colored by an electrochromic process. The particular electrochromic coloration process used is electrolytic…
This paper is divided into two parts. The authors’ purpose in Part I is to formulate a set of mathematically consistent governing differential equations of motion describing the nonplanar, nonlinear dynamics of an inextensional beam. The beam is assumed to undergo flexure about two principal axes and torsion. The equa…
A mathematical model of the initiation stage of crevice corrosion has been developed, based on the generally accepted mechanism of oxygen depletion within the crevice, followed by a pH fall and eventually permanent breakdown of the passive film and the onset of rapid corrosion. The model highlights the importance of t…
Organs of fish, amphibian, reptile, bird and mammals when stained by Sirius Red and studied with polarization microscopy present different colors in regions where collagens I, II and III have been described. Collagen type I presented a yellow, orange or red color while collagen type III appeared green. Collagen type I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Classical Thermodynamic Discussion of the Effect of Composition on Glass-Transition TemperaturesP. R. Couchman and F. E. KaraszCite this: Macromolecules 1978, 11, 1, 117–119Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inis…
RESUME Ramon Margalef Departamento de Ecologia, Universidad de Barcelona, Barcelona, 7, Spain. Received 4/4/78, in revised form 20/5/78, accepted 28/5/78. The different life-forms observed in phytoplankton are functionally interpreted as adaptations to survival in an unstable and turbulent environment. In comparison w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStrong metal-support interactions. Group 8 noble metals supported on titanium dioxideS. J. Tauster, S. C. Fung, and R. L. GartenCite this: J. Am. Chem. Soc. 1978, 100, 1, 170–175Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published i…
Abstract Lattice images of the niobium oxides, structures based on the linkage of octahedral groups in continuous networks, occasionally contain features recognizable as dislocations. Since lattice imaging enables the micro-structure to be resolved in great detail, at the level of local structural organization, it is…
Defects introduced by high energy electron irradiation at low temperatures have been studied in manganese doped RbMgF 3 . At these low temperatures negative-ion vacancies are not mobile and only the various radiation induced interstitials and X 2 - (V K ) centres are mobile. It is found that at 15K where X 2 - centres…
The magnetic susceptibilities parallel and perpendicular to the chain axis have been measured in the three linear ferromagnets TMNC, TMNB and CsNiF 3 between 1.2 and 77K. Strong anisotropy is observed at low temperature. The variation of chi //c with temperature is in good agreement with the predictions of the quantum…
Presents room-temperature measurements of the in-plane resistivity (j,E perpendicular to c) and Hall coefficient (j perpendicular to c ,B/sub //c/) of TiSe 2 and TiS 2 as a function of pressure. With pressure both the resistivity and Hall coefficient decrease rapidly in TiSe 2 ; this the authors interpret in terms of…
In Nb${\mathrm{Se}}_{3}$ one-dimensional diffuse scattering was observed above 140 K and the satellite spots at a lower temperature. They correspond to the Kohn anomaly and the superlattice coupled with charge-density wave, respectively. The superlattice was found to be incommensurate, with the period ${a}^{\ensuremat…
Whewellite and weddellite, calcium salts of oxalic acid, have been found in the litter layer of several different soils, indicating that oxalate is a major metabolic product of fungi in natural environments. The presence of oxalate in soil solution speeds weathering of soil minerals and increases the availability of n…
The programming of the R-matrix method recently used to calculate total and partial atomic photoionisation cross sections has been extended to enable photoelectron angular-distribution beta parameters to be studied for a general atomic system. The program has been used to calculate the beta -parameters for photoelectr…