Seelig R (40 results)

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paperback. Condition: Good. First Edition. Corners are bent. Used - Good.

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SC. Condition: Gut. Obr-, [WES59]. Deu 400g.

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Paperback. Condition: Brand New. 53 pages. 11.00x8.50x0.12 inches. In Stock.

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Soft cover. Condition: Near Fine. Soft cover. Minimal wear. Very clean, crisp and tight. Feel free to email for additional images. Seelig, GH, Abbott, RW (photography) (illustrator).

Broché. Condition: Assez bon. Ed. U.S. Antarctic Research Program. 1965, 23 pages. Avec l'article : - Western Ross Sea-Balleny islands-Macquarie, Seelig, Walter R. Brochure. Format : 20,5 x 26,5. BE intérieur, pages légèrement jaunies. Etat extérieur satisfaisant, légèrement défraîchi.

Condition: New.

Hardcover. Condition: Used: Very Good. Libro nuovo. La copertina risulta strappata in più punti. Consegna 24/48 ore 50L4. Renate Seelig (illustrator).

Condition: Fine. 126 pp., Hardcover, fine. - If you are reading this, this item is actually (physically) in our stock and ready for shipment once ordered. We are not bookjackers. Buyer is responsible for any additional duties, taxes, or fees required by recipient's country. Photos available upon request.…

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Condition: New. pp. 140.

Taschenbuch. Condition: Neu. Ab Initio Calculations of Conformational Effects on 13C NMR Spectra of Amorphous Polymers | R. Born (u. a.) | Taschenbuch | ix | Englisch | 2011 | Springer | EAN 9783642644900 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu. …

Taschenbuch. Condition: Neu. Druck auf Anfrage Neuware - Printed after ordering - In NMR, it is well-known that the chemical shift conveys structural informa tion, e. g. a carbonyl carbon will have a resonance frequency appreciably dif ferent from a methyl carbon, etc. The relation between structure and chemical shift is mostly established by empirical rules on the basis of prior experience. It is only quite recently that the advent of both comparatively cheap comput ing power and novel quantum chemistry approaches have provided feasible routes to calculate the chemical shift at the ab initio level for molecules of reasonable size. This raises the question whether application of these novel theoretical concepts offers a means of obtaining new structural information for the complex chain molecules one deals with in polymer science. Solid state 13C-NMR spectra of glassy amorphous polymers display broad, partially structured resonance regions that reflect the underlying disorder of the polymer chains. The chemical shift responds to the variation of the ge ometry of the chain, and the broad resonance regions can be explained by an inhomogeneous superposition of various chain geometries (and thus chem ical shifts). In this review, we present a novel approach to combine polymer chain statistical models, quantum chemistry and solid state NMR to pro vide quantitative information about the local chain geometry in amorphous polymers. The statistical model yields the relative occurrence of the various geometries, and quantum chemistry (together with a force field geometry op timization) establishes the link between geometry and chemical shift.…

Hardcover. Condition: New.