Materials Literature
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The phase diagram for the system ZrO 2 ‐Y 2 O 3 was redetermined. The extent of the fluorite‐type ZrO 2 ‐Y z O 3 solid solution field was determined with a high‐temperature X‐ray furnace, precise lattice parameter measurements, and a hydrothermal technique. Long range ordering occurred at 40 mol% Y 2 O 3 and the corre…
Low temperature transmission electron microscopy can be used to study the structure of biological materials in the hydrated state. Spatial averaging techniques are necessary to overcome the radiation damage problems, and for this reason the techniques described are most applicable to crystalline objects. However, with…
An experimental model of a hard-disc system (the two-dimensional analogue of a hard-sphere system) is described. The melting transition is studied qualitatively by a photographic technique. The half-width of the singlet distribution function is measured and compared with results obtained by the method of molecular dyn…
Die von Hrn. Kurlbaum in der heutigen Sitzung mitgeteilten interessanten Resultate der von ihm in Gemeinschaft mit Hrn. Rubens auf dem Gebiete der längsten Spektralwellen ausgeführten Energiemessungen haben die zuerst von den Herren Lummer und Pringsheim auf Grund ihrer Beobachtungen aufgestellte Behauptung nachdrückl…
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…