Download or read book Ph nom nes d oxydation des lubrifiants pour moteurs essence fonctionnant haute temp rature written by Xavier Maleville and published by . This book was released on 1993 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book PHENOMENES D OXYDATION DES LUBRIFIANTS MOTEURS A ESSENCE FONCTIONNANT A HAUTE TEMPERATURE written by Xavier Maleville and published by . This book was released on 1993 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BUT DE CETTE THESE EST LA COMPREHENSION DU MECANISME DE L'AUGMENTATION DE LA VISCOSITE DU LUBRIFIANT, ET LA CARACTERISATION DES PRODUITS RESPONSABLES DE CE PHENOMENE, DANS L'ETAPE QUI PRECEDE L'INSOLUBILITE DES PRODUITS. A L'AIDE D'UN TEST D'OXYDATION EN LABORATOIRE, NOUS ETUDIONS LA RESISTANCE A L'OXYDATION D'HUILE DE BASE, L'INFLUENCE DE LA CATALYSE ET LA REPONSE DE CES HUILES AUX ANTIOXYDANTS. NOUS MONTRONS QUE L'HUILE AYANT DE FORTES TENEURS EN CARBONES AROMATIQUES ET EN SOUFRE, AVEC UN ANTIOXYDANT ET CATALYSEE PAR LE FER SOLUBLE, PRESENTE UNE RESISTANCE A L'OXYDATION INFERIEURE AUX AUTRES HUILES DE BASE. ENSUITE, NOUS CARACTERISONS, A L'AIDE DE TECHNIQUES PHYSICO-CHIMIQUES ET DE FRACTIONNEMENT, LES COMPOSES ORGANIQUES FORMES AU COURS DE L'OXYDATION DE L'HUILE: LES PRODUITS VOLATILS, LES PRODUITS LOURDS SOLUBLES ET INSOLUBLES DE L'HUILE OXYDEE. LES CONSTITUANTS POLAIRES DE CES PRODUITS, SONT CONSTITUES D'ESPECES HYDROXYLES, CARBONYLES ET CARBOXYLES. LES PRODUITS VOLATILS SONT FORMES DE COMPOSES OXYGENES LINEAIRES NON SOUFRES, D'EAU, D'ALCANES, AINSI QUE DE CONSTITUANTS OXYGENES CYCLIQUES ET D'AROMATIQUES, PRESENTS UNIQUEMENT POUR LES HUILES MINERALES. LEUR MASSE MOLAIRE MOYENNE EST INFERIEURE A CELLE DE L'HUILE DE BASE. LES ESPECES RESPONSABLES DE L'AUGMENTATION DE LA VISCOSITE SONT LES PRODUITS LOURDS SOLUBLES ET INSOLUBLES DANS L'HUILE OXYDEE. LES PRODUITS SOLUBLES CONTIENNENT DU SOUFRE, ONT 10% D'OXYGENE ET ONT UNE MASSE D'ENVIRON 1000 G/MOL. ILS PROVIENNENT, POUR LES HUILES DE BASE MINERALES, ESSENTIELLEMENT DE L'OXYDATION DES COMPOSES AROMATIQUES. LES PRODUITS INSOLUBLES ONT UNE MASSE MOLAIRE MOYENNE DE 2000 G/MOL, UNE TENEUR EN OXYGENE DE 20% ET UNE FORTE TENEUR EN SOUFRE. LES COMPOSES SOUFRES ET AROMATIQUES D'UNE HUILE MINERALE PARTICIPENT VIVEMENT A LA FORMATION DE PRODUITS INSOLUBLES. FINALEMENT, NOUS AVONS PROPOSE UN MECANISME DE L'AUGMENTATION DE LA VISCOSITE METTANT EN JEU DES INTERACTIONS CHIMIQUES INTERMOLECULAIRES, DES REACTIONS DE CONDENSATION ET FORMATION DE MACROMOLECULES POLAIRES, MACROMOLECULES QUI PERDENT LEUR AFFINITE POUR LE MILIEU ET PRECIPITENT. UNE ETUDE DE LA RESISTANCE A L'OXYDATION, SUR ESSAIS MOTEURS, DE LUBRIFIANTS, FORMULES A PARTIR DE NOS HUILES DE BASE ET A ADDITIVATION IDENTIQUE, CONFIRME NOS RESULTATS, ET MONTRE QU'UN DES PARAMETRES LES PLUS IMPORTANTS DANS LA STABILITE A L'OXYDATION DES HUILES MINERALES FORMULEES EST LE COMPORTEMENT A L'OXYDATION DES HUILES DE BASE ET LEUR REPONSE VIS-A-VIS DES ANTIOXYDANTS, EN PRESENCE DE CATALYSEUR

Download or read book Ph nom nes d oxydation des lubrifiants pour motuers essence fonctionnant haute temp rature written by Xavier Maleville and published by . This book was released on 1993 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.

Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.

Download or read book Soil Conservation Districts written by and published by . This book was released on 1963 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compendium of Sanitation Systems and Technologies written by Elizabeth Tilley and published by . This book was released on 2014 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.

Download or read book Soil and Water Conservation written by Boy Scouts of America and published by . This book was released on 1995 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Outlines requirements for pursuing a merit badge in soil and water conservation.

Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --