Apports de la chimiométrie à l'interprétation des données de la spectroscopie infrarouge

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ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.:/5 (49 download)

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Book Synopsis Apports de la chimiométrie à l'interprétation des données de la spectroscopie infrarouge by : Christine Wojciechowski

Download or read book Apports de la chimiométrie à l'interprétation des données de la spectroscopie infrarouge written by Christine Wojciechowski and published by . This book was released on 1998 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dans l'industrie agroalimentaire, la maitrise de la qualite s'applique autant sur les produits finis que sur les matieres premieres. Les techniques d'analyses classiques, longues et couteuses, posent des problemes de gestion des flux pour des controles de routine. En revanche, la spectroscopie irtf est une technique simple, rapide, fiable et specifique. Combinees avec des methodes chimiometriques qui contribuent a sa rapidite grace au traitement automatique des donnees spectrales, son utilisation est envisagee pour resoudre les problemes donnes. Neanmoins, les methodes d'analyses necessitant l'etablissement d'une calibration souvent longue, leur developpement est justifie pour des analyses frequentes. Afin d'evaluer le potentiel de l'irtf dans le domaine alimentaire, differentes applications ont ete developpees. Avec un echantillonnage adapte (en transmission, en reflexion, par couplage microscopique), les resultats sont competitifs tant sur le domaine qualitatif que quantitatif. La constitution d'une base de donnees de reference permet une caracterisation automatique des ingredients et materiaux d'emballage a reception ainsi qu'une identification des corps etrangers. Apres calibration par regression pls sur des spectres atr, la quantification des vitamines (b1, b2, b6 et pp) dans un melange multivitamines conduit a des erreurs de 3 a 10% par comparaison aux techniques d'analyses traditionnelles. L'application des reseaux de neurones artificiels non supervises (de type kohonen) ou supervises offre la possibilite de discriminer les amidons natifs des amidons modifies avec une precision comparable aux methodes statistiques (pca et pls). Enfin, en complement de la methode cpg, apres calibration par regression pls sur des spectres atr, l'irtf permet d'obtenir rapidement une estimation globale de la teneur en acides gras trans (agt) dans les matieres grasses pour suivre leur evolution au cours des procedes de fabrication.

Spectroscopie infrarouge et chimiométrie pour l'instrumentation en chimie analytique des procédés

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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (965 download)

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Book Synopsis Spectroscopie infrarouge et chimiométrie pour l'instrumentation en chimie analytique des procédés by : Cyril Ruckebusch

Download or read book Spectroscopie infrarouge et chimiométrie pour l'instrumentation en chimie analytique des procédés written by Cyril Ruckebusch and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La chimie analytique des procedes integre les methodes de chimiometrie pour la determination indirecte de proprietes d'interet a partir d'observations complexes, les spectres de vibration par exemple. Les hydrolysats de l'hemoglobine bovine contiennent, selon l'avancement de la proteolyse, des peptides potentiellement utilisables pour la nutrition clinique ou dans les milieux de culture cellulaire. Ainsi, s'il est possible d'evaluer rapidement le degre d'hydrolyse de la reaction, un etat du procede produisant une population peptidique choisie peut etre maintenu. Des modeles empiriques doivent donc etre elabores a partir d'observations en ligne, par atr-ftir, sur differentes repetitions a l'echelle pilote du procede. L'analyse des donnees spectrales echantillonnees revele, notamment par le biais des cartes auto-organisatrices de kohonen, une structure du nuage de points qui rend incontestablement delicate la procedure d'etalonnage. Neanmoins, les modeles de reseaux de neurones artificiels a retro-propagation de l'erreur se montrent performants. La precision de la prediction est estimee par un critere rmsep autour de 0,4% dans la gamme 0 ; 8,7%. De plus, les modeles optimises possedent une architecture tres simple, basee sur une topologie 441, qui confere une credibilite supplementaire a la methode ; interpretations, deductions et validations sont possibles, du point de vue des spectres de vibration comme des parametres du modele.

La spectroscopie infrarouge et ses applications analytiques

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Publisher :
ISBN 13 : 9782743008093
Total Pages : 660 pages
Book Rating : 4.0/5 (8 download)

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Book Synopsis La spectroscopie infrarouge et ses applications analytiques by : Dominique Bertrand

Download or read book La spectroscopie infrarouge et ses applications analytiques written by Dominique Bertrand and published by . This book was released on 2006-01-01 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt: Présente tous les aspects de la spectroscopie infrarouge appliquée à l'analyse des produits alimentaires, en étudiant dans un même cadre le proche et le moyen infrarouge. Sont développés les méthodes d'analyse rapide, les bases physiques de la spectroscopie infrarouge, les spectres des constituants majeurs des aliments, les principales applications de la chimiométrie...

Soil Analysis

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Publisher : CRC Press
ISBN 13 : 9789054107163
Total Pages : 514 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis Soil Analysis by : J. Gautheyrou

Download or read book Soil Analysis written by J. Gautheyrou and published by CRC Press. This book was released on 2001-01-01 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to provide a better understanding of tools for soil analysis in order to use them more efficiently. It covers sampling problems as well as difficulties relating to actual analysis and quality control.

Biotechnology and Sustainable Development

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Publisher : CABI
ISBN 13 : 9780851996752
Total Pages : 340 pages
Book Rating : 4.9/5 (967 download)

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Book Synopsis Biotechnology and Sustainable Development by : Ismail Serageldin

Download or read book Biotechnology and Sustainable Development written by Ismail Serageldin and published by CABI. This book was released on 2003 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the first scientific conference convened at the Library of Alexandria, 'Biotechnology and Sustainable Development: Voices of the South and North', which was held in Alexandria, Egypt, in March 2002, this book contains overviews of agriculture, health, ethics and the environment. It discusses how dramatic improvements in food security, health, and lifestyle could accrue to the poor people of developing countries through the applications of new technologies.

LRCW 3

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Publisher :
ISBN 13 : 9781407307343
Total Pages : 0 pages
Book Rating : 4.3/5 (73 download)

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Book Synopsis LRCW 3 by : Simonetta Menchelli

Download or read book LRCW 3 written by Simonetta Menchelli and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

LRCW 2

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Publisher : British Archaeological Reports Oxford Limited
ISBN 13 :
Total Pages : 510 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis LRCW 2 by : Michel Bonifay

Download or read book LRCW 2 written by Michel Bonifay and published by British Archaeological Reports Oxford Limited. This book was released on 2007 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers from the second Late Roman Coarse Wares conference, held in Aix-en-Provence in April 2005.

Use of Sediment Quality Guidelines and Related Tools for the Assessment of Contaminated Sediments

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Publisher : SETAC
ISBN 13 : 1880611716
Total Pages : 818 pages
Book Rating : 4.8/5 (86 download)

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Book Synopsis Use of Sediment Quality Guidelines and Related Tools for the Assessment of Contaminated Sediments by : Richard J. Wenning

Download or read book Use of Sediment Quality Guidelines and Related Tools for the Assessment of Contaminated Sediments written by Richard J. Wenning and published by SETAC. This book was released on 2005 with total page 818 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Confronting Poverty in Iraq

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Publisher : World Bank Publications
ISBN 13 : 0821385631
Total Pages : 114 pages
Book Rating : 4.8/5 (213 download)

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Book Synopsis Confronting Poverty in Iraq by : World Bank

Download or read book Confronting Poverty in Iraq written by World Bank and published by World Bank Publications. This book was released on 2011-01-10 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report provides the most comprehensive and rigorous analysis of Iraqi income and expenditure in several decades. The report makes extensive use of the Iraq Household Socio-Economic Survey, the first nationwide income and expenditure survey since 1988. IHSES data is complemented income and expenditure data from a wide range of other measures of living standards, allowing us to analyze living standards in a holistic way. The analysis presented here was performed with two main goals first, to inform the Government s Poverty Reduction Strategy; and second, to serve as a baseline for future assessments of changes in living standards and the identification of critical issues for deeper examination. Iraqi living standards have two unusual characteristics. First, they have fallen over the past generation. Second, they feature surprisingly little inequality. These characteristics are both rooted in Iraq s recent history of authoritarian government, war, military occupation, insurgency, and civil strife leading to infrastructure destruction and population displacement. There have been few opportunities for individuals to prosper from professional or entrepreneurial activities. Decades of neglected investment have resulted in deterioration of social services and economic infrastructure. Consequently, individuals have lacked capabilities to prosper and an investment climate conducive to prosperity. School enrollment and life expectancy have declined. Extremely low returns to education reflect the combination of poor educational quality and lack of employment opportunities. In terms of economic infrastructure, access to reliable electricity and water, and even access to paved roads are low, are further reflections of decades of neglect. While the upper end of the distribution has been pulled down by a lack of opportunities, the lower end has been supported by direct government provision of food. The Public Distribution System (PDS) provides 85 percent of food needs. While PDS has been useful as a safety net for the poor and the vulnerable, the system is expensive, inefficient, and fiscally risky. Indeed, PDS food rations account for a far greater share of public spending than does education or health. Going forward, Iraq faces two main challenges. First, although Iraq does not have to develop from scratch, it faces a formidable challenge in re-development. Second, a shift by the Government is required from direct provision of basic subsistence toward investment in human capacities. The Government can provide an enabling environment through investments in economic infrastructure and services to business and citizens, thus allowing the population to make productive use of education and their own labor. Both challenges are now being taken up by the Poverty Reduction Strategy, which articulates a detailed set of required actions and outlines priorities for government spending.

Conceptual Modeling for Traditional and Spatio-Temporal Applications

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Publisher : Springer Science & Business Media
ISBN 13 : 354030326X
Total Pages : 475 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis Conceptual Modeling for Traditional and Spatio-Temporal Applications by : Christine Parent

Download or read book Conceptual Modeling for Traditional and Spatio-Temporal Applications written by Christine Parent and published by Springer Science & Business Media. This book was released on 2006-09-02 with total page 475 pages. Available in PDF, EPUB and Kindle. Book excerpt: From environmental management to land planning and geo-marketing, the number of application domains that may greatly benefit from using data enriched with spatio-temporal features is expanding very rapidly. This book shows that a conceptual design approach for spatio-temporal databases is both feasible and easy to apprehend. While providing a firm basis through extensive discussion of traditional data modeling concepts, the major focus of the book is on modeling spatial and temporal information.