70. Method for Sampling and Analyzing Non-Polar Materials Among ABS-Related Industries

Near-field effects in radiative transfer refer to the collective influence of interference, diffraction, and tunneling of electro-magnetic waves on energy transfer between two or more objects. Most studies of near-field radiative transfer have so far focused on the enhancement due to tunneling of surface polaritons. In this work, we show the existence of sharp peaks in the radiative transfer spectrum between two spheres of polar materials that are not due to surface polaritons. The peaks, which are present on either side of the restrahlen band, are because of Mie resonances.

Download Full-text

A Selection of Grapes

The Chemistry of Wine ◽

10.1093/oso/9780190687199.003.0024 ◽

2018 ◽

Author(s):

David R. Dalton

Keyword(s):

Low Density ◽

Ether Extract ◽

Cinnamic Acids ◽

La Mancha ◽

Polar Materials ◽

The World ◽

Drought Resistant ◽

Mass Spectrometric Techniques ◽

Ether Phase ◽

Selection Of

This undistinguished, productive, drought resistant, vigorous white grape, Airén, from the La Mancha region of Spain, was said to be the most widely planted grape in the world. In part the justification for this claim relies upon the observation that it is planted at a very low density! Except for its use in blending to make other wines “lighter,” it has not found wide accep¬tance. In part, it appears that its lack of popularity is the result of what is reported to be a mild, neutral flavor, and advertising has not pushed wines produced from it to the fore. Although it is now common to attempt to analyze the headspace (or ullage) in bottled wine (as well as the wine itself ) by chromatographic and mass spectrometric techniques it is less common to find that the grapes (skin, must, and seeds) are also subjected to such analysis. Nonetheless, the phenolic composition of V. vinifera var Airén was subjected to just such analysis during ripening from véraison to “technological” maturity (i.e., maturity which might actually be earlier than harvest, the latter being the decision of the viticulturist and vintner). The analysis of the ethyl ether extract of macerated skins, seeds, and accumulated solids (the pomace) was undertaken. Procyanidins and anthocyanins which would (the authors claim) interfere with subsequent analysis would not move into the ether phase. It was also found (using controls) that other highly polar materials (e.g., carboxylic acids) were only poorly extracted from the macerated skins and seeds. The isolated compounds and some information about their sources are provided in Figures 14.1 and 14.2. The analysis of the seeds, skin, and must did lead to the conclusion that “the maximum concentrations of benzoic and cinnamic acids and aldehydes and flavonol aglycones and glycosides at the end of the ripening period did not coincide with the minimum concentrations of the flavan-3-ols and hydroxycinnamic tartaric esters.” Depending upon what was sought, this information might thus affect decisions concerning the harvest date.

Download Full-text

Small-Angle Oblique-Incidence Infrared Reflection in Polar Materials: II. Experiment on ZnO

Journal of the Physical Society of Japan ◽

10.1143/jpsj.79.064712 ◽

2010 ◽

Vol 79 (6) ◽

pp. 064712 ◽

Cited By ~ 7

Author(s):

Noritaka Kuroda ◽

Yuji Kumagai ◽

Takeshi Himoto ◽

Hiroyuki Yokoi

Keyword(s):

Small Angle ◽

Oblique Incidence ◽

Infrared Reflection ◽

Polar Materials

Download Full-text

Modelling of vapour sorption in polar materials: Comparison of Flory–Huggins and related models with the ENSIC mechanistic approach

Journal of Membrane Science ◽

10.1016/s0376-7388(98)00111-2 ◽

1998 ◽

Vol 147 (1) ◽

pp. 59-71 ◽

Cited By ~ 33

Author(s):

Anne Jonquières ◽

Laurent Perrin ◽

Alain Durand ◽

Stéphanie Arnold ◽

Pierre Lochon

Keyword(s):

Vapour Sorption ◽

Mechanistic Approach ◽

Polar Materials

Download Full-text