Analyse par chromatographie en phase liquide des additifs présents dans les lubrifiants hydrosolubles PDF Download
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Author: Christine Tlili
Publisher:
ISBN:
Category :
Languages : fr
Pages : 286
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Book Description
Author: Christine Tlili
Publisher:
ISBN:
Category :
Languages : fr
Pages : 286
Get Book Here
Book Description
Author: DOMINIQUE.. DILETTATO
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Book Description
LA CHROMATOGRAPHIE EN PHASE SUPERCRITIQUE (CPS) CAPILLAIRE QUI UTILISE LE DIOXYDE DE CARBONE COMME PHASE MOBILE EST SPECIALEMENT ADAPTEE A L'ANALYSE DE MELANGES COMPLEXES DE COMPOSES MODEREMENT POLAIRES, PEU VOLATILS OU THERMOSENSIBLES. SON APPLICATION A LA SEPARATION D'ADDITIFS DE TRANSFORMATION DES POLYMERES DANS DES PLASTIQUES S'EST AVEREE TOUT A FAIT INTERESSANTE. POUR LES ADDITIFS ANALYSES, SES PERFORMANCES ONT ETE COMPAREES A CELLES DE LA CHROMATOGRAPHIE EN PHASE LIQUIDE HAUTE PERFORMANCE ET A CELLES DE LA CHROMATOGRAPHIE EN PHASE GAZEUSE HAUTE TEMPERATURE. LA CPS CAPILLAIRE S'EST REVELEE ETRE LA TECHNIQUE LA PLUS PERFORMANTE. PAR AILLEURS, LES ESSAIS PRELIMINAIRES REALISES SUR SON COUPLAGE A LA SPECTROMETRIE DE MASSE AVEC LES ADDITIFS LES PLUS LOURDS ONT FOURNI DES RESULTATS PROMETTEURS
Author: HAMID.. HUSSAIN MASSOUD
Publisher:
ISBN:
Category :
Languages : fr
Pages : 109
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Book Description
LE PROBLEME DE L'ANALYSE DES SULFONATES PAR DIVERSES TECHNIQUES CHROMATOGRAPHIQUES UTILISANT DES PHASES STATIONNAIRES DE TYPES SILICE, SILICE GREFFEE POLAIRE ET SILICE GREFFEE APOLAIRE, EST D'ABORD ETUDIE. L'ETUDE CHROMATOGRAPHIQUE DES DIALKYLDITHIOPHOSPHATES METALLIQUES EST ENSUITE ABORDEE. LA MISE EN OEUVRE DE DIFFERENTS SYSTEMES CHROMATOGRAPHIQUES, AINSI QUE DE DIFFERENTS MOYENS DE DETECTION (PAR REFRACTOMETRIE DIFFERENTIELLE, PAR ABSORPTIOMETRIE DANS L'UV, PAR VOIE ELECTROCHIMIQUE) PERMET DE DISTINGUER CES CONSTITUANTS SELON LEURS CHAINES ALKYLES ET SELON LA NATURE DU METAL. ENFIN, LA DEGRADATION DE CETTE DERNIERE CLASSE D'ADDITIFS, EST ETUDIEE DANS LE BUT DE METTRE AU POINT DES TECHNIQUES ANALYTIQUES DEVANT PERMETTRE DE MIEUX COMPRENDRE LES MECANISMES D'ACTION DE CES COMPOSES
Author: Jacques COTTERET
Publisher:
ISBN:
Category :
Languages : fr
Pages : 384
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Author: World Bank
Publisher: World Bank Publications
ISBN: 0821385631
Category : Social Science
Languages : en
Pages : 114
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Book Description
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.
Author: Christine Parent
Publisher: Springer Science & Business Media
ISBN: 354030326X
Category : Computers
Languages : en
Pages : 475
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Book Description
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.
