996 resultados para Jones matrix


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Immobilized lipase B from Candida antarctica (Novozym® 435, N435) was utilized as part of a chemoenzymatic strategy for the synthesis of branched polyesters based on a cyclotetrasiloxane core in the absence of solvent. Nuclear magnetic resonance spectroscopy and matrix-assisted laser desorption ionization time-of-flight mass spectrometry were utilized to monitor the reactions between tetraester cyclotetrasiloxanes and aliphatic diols. The enzyme-mediated esterification reactions can achieve 65– 80% consumption of starting materials in 24–48 h. Longer reaction times, 72–96 h, resulted in the formation of cross-linked gel-like networks. Gel permeation chromatography of the polymers indicated that the masses were Mw ¼ 11 400, 13 100, and 19 400 g mol 1 for the substrate pairs of C7D4 ester/ octane-1,8-diol, C10D4 ester/pentane-1,5-diol and C10D4 ester/octane-1,8-diol respectively, after 48 h. Extending the polymerization for an additional 24 h with the C10D4 ester/octane-1,8-diol pair gave Mw ¼ 86 800 g mol 1. To the best of our knowledge this represents the first report using lipase catalysis to produce branched polymers that are built from a cyclotetrasiloxane core.

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Letter addressed to Robert D. Band from A.R.W. Jones of the Personal Trust Department of the Royal Trust Company, Toronto listing the securities to be held by Mr. Band and his sister and brother, Sept. 5, 1961.

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Payment for Shelby, Cunningham, Jarvis, Mater and Jones accounts. This document has some water damage which has smeared the writing but it does not affect text, July 29, 1882.

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Payment for the Shelby, Cunningham, Jarvis, Jones, Mater, Sampson, Conklin, Dennis and Griffin accounts, Jan. 29, 1883.

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Payment for the Shelby, Cunningham, Jarvis, Jones, Mater, Sampson, Dennis, Conklin and Griffin accounts, July 30, 1883.

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Payment for the Cunningham, Jarvis, Jones, Mater, Sampson, Dennis, Conklin and Griffin accounts, Jan. 29, 1884.

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Payment for Atkins, Schmidt, Crick, Mank, Underwood and Crew accounts Jan. 26, 1886.

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Payment for Sampson, Griffin, Cunningham and Jones accounts, Feb. 14, 1887.

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Note (1 page, handwritten) by Samuel Woodruff regarding the Cunningham, Mater and Jones accounts, n.d.

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Letter which was enclosed with the application, bond mortgage and abstract of the Jones and Mater accounts to Samuel Woodruff from Jarvis, Conklin and Co., May 4, 1882.

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Printed blank of Statement of Security Form naming the bond as Jones County Texas Bonds for the purpose of building a courthouse. It is made out to S.D. Woodruff and dated June 12, 1885. An envelope addressed to Mr. S.D. Woodruff is also included. The postmarks are Kansas, 1885 and St. Catharines, June 13, 1885.

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Affiliation: Département de Médecine, Faculté de médecine, Université de Montréal & Centre de Recherche du Centre Hospitalier de l'Université de Montréal (CHUM), Hôpital Notre-Dame du CHUM

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On étudie l’application des algorithmes de décomposition matricielles tel que la Factorisation Matricielle Non-négative (FMN), aux représentations fréquentielles de signaux audio musicaux. Ces algorithmes, dirigés par une fonction d’erreur de reconstruction, apprennent un ensemble de fonctions de base et un ensemble de coef- ficients correspondants qui approximent le signal d’entrée. On compare l’utilisation de trois fonctions d’erreur de reconstruction quand la FMN est appliquée à des gammes monophoniques et harmonisées: moindre carré, divergence Kullback-Leibler, et une mesure de divergence dépendente de la phase, introduite récemment. Des nouvelles méthodes pour interpréter les décompositions résultantes sont présentées et sont comparées aux méthodes utilisées précédemment qui nécessitent des connaissances du domaine acoustique. Finalement, on analyse la capacité de généralisation des fonctions de bases apprises par rapport à trois paramètres musicaux: l’amplitude, la durée et le type d’instrument. Pour ce faire, on introduit deux algorithmes d’étiquetage des fonctions de bases qui performent mieux que l’approche précédente dans la majorité de nos tests, la tâche d’instrument avec audio monophonique étant la seule exception importante.