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Author: Maxime Guérette
Publisher:
ISBN:
Category :
Languages : fr
Pages : 135
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Author: Maxime Guérette
Publisher:
ISBN:
Category :
Languages : fr
Pages : 135
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Book Description
![Synthèse et caractérisation de polymères semi-conducteurs à base de 5-alkyl [3,4-c] thienopyrrole-4,6-dione PDF](https://books.google.com/books/content/images/frontcover/8LFBzQEACAAJ?fife=w80-h100)
Author: Philippe Berrouard
Publisher:
ISBN:
Category :
Languages : en
Pages : 177
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Book Description
Cette thèse porte sur la synthèse et la caractérisation de polymères à base de 5-alkyl[3,4-c]thienopyrrole-4,6-dione (TPD). Une importance particulière a été allouée aux aspects synthétiques entourant la conception de ces polymères. En premier lieu, nous avons étudié la réaction de polycondensation par hétéroarylation directe (DHAP) entre une unité TPD et une unité bithiophène. Le polymère obtenu par DHAP a été entièrement caractérisé et ses propriétés ont été comparées avec celles d'un polymère homologue fait par couplage de Stille. En second lieu, nous avons élaboré une voie de synthèse menant à un intermédiaire clef : le TPD possédant un atome d'iode en position 2. Cet intermédiaire permet, de façon simple et peu coûteuse, la confection de nouveaux monomères et polymères. Finalement, en unifiant les concepts développés au cours de nos travaux sur la DHAP et le TPD mono halogénés, nous avons simplifié davantage la synthèse de certains monomères et polymères de TPD. Nous avons également conçu une nouvelle série d'homopolymères et de pseudohomopolymères de TPD. Ces matériaux ont été caractérisés et des corrélations ont été faites entre les structures et les propriétés de ces polymères.
Author: Veronica Cortes de Zea Bermudez
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
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Book Description
UNE NOUVELLE FAMILLE DE MATERIAUX POLYMERES CONDUCTEURS PROTONIQUES BASIQUES EST PRESENTEE. LE CONCEPT DE DOPAGE PAR TROUS DE PROTONS EST INTRODUIT. IL CONSISTE A ARRACHER DES PROTONS AUX FONCTIONS SULFAMYLES, RSO#2NH-(PKA=11), APPARTENANT AU POLYMERE. LES SYSTEMES PROPOSES CONTIENNENT TROIS COMPOSANTS: 1) UNE MATRICE POLYMERE COMPORTANT DES UNITES SOLVATANTES LINEAIRES POLY(OXYETHYLENE) OU DES POLYMACROMONOMERES A CHAINE OLIGOOXYETHYLENIQUE; 2) UNE SOURCE DE PROTONS (GROUPEMENT SULFAMYLE LIBRE OU GREFFE) ET 3) UN AGENT DEPROTONANT (EXTERNE: CATION GUANIDINIUM OU INTERNE: GROUPEMENT IMIDAZOLINE). CETTE ETUDE A PORTE DANS UN PREMIER TEMPS SUR LA SULFAMIDE. SA CONDUCTIVITE NON NEGLIGEABLE A TEMPERATURE AMBIANTE EST ASSOCIEE A UN MECANISME D'AUTO-PROTONATION. LE SPECTRE VIBRATIONNEL A ETE REATTRIBUE ET L'EXISTENCE D'UNE TRANSITION DE PHASE PRE-FUSIONNELLE EST MISE EN EVIDENCE. LA SULFAMIDE A ETE INITIALEMENT COMPLEXEE PAR LE POLY(OXYETHYLENE). LE DIAGRAMME DE PHASES CORRESPONDANT A ETE TRACE. EN ABSENCE D'AGENT DOPANT, DES CONDUCTIVITES DE L'ORDRE DE 10##5 S/CM SONT OBSERVEES. DES MELANGES SULFAMIDETETRAETHYLENEGLYCOLDIMETHYLETHER ET SULFAMIDE/EAU ONT ETE ANALYSES PAR SPECTROSCOPIE RAMAN ET INFRAROUGE, INDIQUANT LA FAIBLESSE DES INTERACTIONS ENTRE LA SULFAMIDE ET LE POLY(OXYETHYLENE). LES ETUDES SPECTROSCOPIQUES REALISEES SUR LES COMPLEXES POLY(OXYETHYLENE)/SULFAMIDE REVELENT L'INFLUENCE DE L'EPAISSEUR DES FILMS ET DU DOPAGE SUR LE DEGRE D'HETEROGENEITE DES ECHANTILLONS. L'INCORPORATION DE SULFAMIDE A DES POLYMERES SOLVATANTS A SQUELETTE DE POLY(METHYLMETHACRYLATE) ET CHAINES LATERALES OLIGOOXYETHYLENIQUES COURTES CONDUIT A L'OBTENTION DE MATERIAUX ENTIEREMENT AMORPHES. LA CONDUCTIVITE MAXIMALE A TEMPERATURE AMBIANTE ATTEINT 3 10##5 S/CM PAR DOPAGE. DES RESEAUX TRIDIMENSIONNELS A SQUELETTE DE SILICE ONT ETE SYNTHETISES PAR LA METHODE SOL-GEL: LES SULFONAMIDOSILS A GROUPEMENTS SULFAMYLES GREFFES (AVEC UN DOMAINE DE STABILITE ELECTROCHIMIQUE DE 2V) ET LES ORMOLYTES A GROUPEMENTS SULFAMOYLES LIBRES DONT LA CONDUCTIVITE EST DE L'ORDRE DE 10##6 S/CM A 25C
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 854
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Author: Gérard Dreyfus
Publisher: Springer Science & Business Media
ISBN: 3540288473
Category : Science
Languages : en
Pages : 509
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Book Description
Neural networks represent a powerful data processing technique that has reached maturity and broad application. When clearly understood and appropriately used, they are a mandatory component in the toolbox of any engineer who wants make the best use of the available data, in order to build models, make predictions, mine data, recognize shapes or signals, etc. Ranging from theoretical foundations to real-life applications, this book is intended to provide engineers and researchers with clear methodologies for taking advantage of neural networks in industrial, financial or banking applications, many instances of which are presented in the book. For the benefit of readers wishing to gain deeper knowledge of the topics, the book features appendices that provide theoretical details for greater insight, and algorithmic details for efficient programming and implementation. The chapters have been written by experts and edited to present a coherent and comprehensive, yet not redundant, practically oriented introduction.
Author: Alexandru Grumezescu
Publisher: Academic Press
ISBN: 0128043784
Category : Science
Languages : en
Pages : 926
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Book Description
Encapsulations, a volume in the Nanotechnology in the Agri-Food Industry series,presents key elements in establishing food quality through the improvement of food flavor and aroma. The major benefits of nanoencapsulation for food ingredients include improvement in bioavailability of flavor and aroma ingredients, improvement in solubility of poor water-soluble ingredients, higher ingredient retention during production process, higher activity levels of encapsulated ingredients, improved shelf life, and controlled release of flavor and aroma. This volume discusses main nanoencapsulation processes such as spray drying, melt injection, extrusion, coacervation, and emulsification. The materials used in nanoencapsulation include lipids, proteins, carbohydrates, cellulose, gums, and food grade polymers. Applications and benefits of nanoencapsulation such as controlled release, protections, and taste masking will be explained in detail. Includes the most up-to-date information on nanoencapsulation and nanocontainer-based delivery of antimicrobials Presents nanomaterials for innovation based on scientific advancements in the field Provides control release strategies to enhance bioactivity, including methods and techniques for research and innovation Provides useful tools to improve the delivery of bioactive molecules and living cells into foods
Author: Xian Jun Loh
Publisher: Springer
ISBN: 9812871527
Category : Technology & Engineering
Languages : en
Pages : 229
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Book Description
This book presents the research involving in situ gelling polymers and can be used as a guidebook for academics, industrialists and postgraduates interested in this area. This work summaries the academic contributions from the top authorities in the field and explore the fundamental principles of in situ gelling polymeric networks, along with examples of their major applications. This book aims to provide an up-to-date resource of in situ gelling polymer research.
Author: Linda Strande
Publisher: IWA Publishing
ISBN: 1780404735
Category : Technology & Engineering
Languages : en
Pages : 428
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Book Description
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.
Author: Antonio Pizzi
Publisher: CRC Press
ISBN: 9004190937
Category : Technology & Engineering
Languages : en
Pages : 464
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Book Description
Wood adhesives are of tremendous industrial importance, as more than two-thirds of wood products in the world today are completely or partially bonded together using a variety of adhesives. Adhesive bonding offers many advantages over other joining methods for wood components, and there has been a great deal of R& D activity in devising new wood adhesives or improving the existing ones. The modern mantra in all industrial sectors is: "think green, go green," which has attracted much attention in the wood adhesive industry. Therefore, there is also a lot of research activity in synthesizing environmentally benign and human-friendly wood adhesives. This book is divided into four parts: Part 1: Fundamental Adhesion Aspects in Wood Bonding; Part 2: Synthetic Adhesives; Part 3: Environment-friendly adhesives; and Part 4: Wood Welding and General Paper. It addresses many different types of wood adhesives, as well as bonding (welding) of wood components without adhesives, a more recent development. The information contained in this book is valuable for individuals engaged in all aspects of wood adhesion and adhesives and, hopefully, will inspire new ideas in wood adhesives, a topic of vital industrial importance.
Author: Paul-André Calatayud
Publisher: IRD Editions
ISBN: 9782709916141
Category : Cassava
Languages : en
Pages : 116
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Book Description
Most basic information on plant-mealybug interactions during the last decade has come from research on the cassava Manihot esculenta Crantz (Euphorbiaceae) system with two mealybug species, namely Phenacoccus manihoti Matile-Ferrero and Phenacoccus herreni Cox and Williams (Sternorrhyncha: Pseudococcidae). Both these insects cause severe damage to cassava in Africa and South America, respectively. This book reviews these interactions (plant selection by the insects, nutritional requirements
