Materials Literature
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Conventionally batched varistors in the ZnO–Co3O4–Pr6O11 system that were sintered at or above 1280 °C exhibited a sharp increase in the average breakdown voltage per grain boundary. In these samples, barrier heights and donor concentration values, derived from capacitance-voltage analysis, exhibited sharp changes at…
Abstract Silicon nitride is a ceramic material of great interest to advanced engine construction and mechanical engineering owing to an outstanding combination of favorable properties like high mechanical strength at high temperatures, corrosion and wear resistance, great hardness, and low density. The material is bas…
This review reports data on the general and renal tolerance of the paramagnetic contrast agent Gd-DTPA after intravenous administration. Gd-DTPA was administered usually at a dose level of 0.1-0.2 mmol/kg body wt (range: 0.005-0.25 mmol/kg body wt) in cranial, spinal and body MR indications. In phase I-IIIa studies a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of distillation compositions from multiple temperature measurements using partial-least-squares regressionThor Mejdell and Sigurd SkogestadCite this: Ind. Eng. Chem. Res. 1991, 30, 12, 2543–2555Publication Date (Print):December 1, 1991Publication History Published…
Abstract This review summarizes the literature relating to the application of surface‐enhanced Raman scattering (SERS) and surface‐enhanced resonance Raman scattering (SERRS) techniques to the study of biological molecules. The emphasis is on publications that have appeared during the period from 1985 to 1991. The rev…
The effect of chitosan coating (1.0 and 1.5% w/v) on the storability of bell pepper and cucumber fruits stored at 13 and 20C (RH 85%) was determined by monitoring the weight loss, respiration and quality: Chitosan coating markedly reduced the weight loss in both bell pepper and cucumber at both temperatures. Increasin…
Abstract This review concentrates on the electronic contribution to surface‐enhanced Raman scattering (SERS). This socalled ‘chemical effect’ is quantitatively separated from classical electromagnetic enhancement. It proceeds by increased electron‐photon coupling at an atomically rough surface and by temporary charge…
Laminar composites, containing layers of Ce‐ZrO 2 and either Al 2 O 3 or a mixture of Al 2 O 3 and Ce‐ZrO 2 , have been fabricated using a colloidal method that allowed formation of layers with thicknesses as small as 10 μm. Strong interactions between these layers and the martensitic transformation zones surrounding…
The structure of persistent shear bands in granular materials is investigated by numerically simulating an idealized assembly of two-dimensional particles. Flexible stress-controlled boundaries are used instead of periodic boundaries to avoid constraining the motion of particles within the shear bands. The displacemen…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Macromolecules carrying biological information often consist of independent modules containing recurring structural motifs. Detection of a specific structural motif within a protein (or DNA) aids in elucidating the role played by the protein (DNA element) and the mechanism of its operation. The number of crystallograp…
Experiments with light-emitting porous silicon (LEPOS) are described. The porous silicon was made from n-type silicon by anodization in an electrolytic cell by HF with an applied electrical current. Visible light emission was achieved by irradiation with ultraviolet light. Visible electroluminescence (EL) was achieved…
In this article emphasis will be placed on selectively from 45 papers presented at the spring meeting and 33 papers also presented at the fall meeting.
The main factors of deterioration that affect the Cathedral of Guadíx are of a natural origin, basically thermic and hydraulic, due to its great oscillations in temperature in Summer, the frequency of frosts in Winter and the rains. The lithotypes employed are mainly calcarenite of mean porosite and slightly more comp…