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Book Description
La modélisation des propriétés cohésives de polymères amorphes présente de nombreux intérêts, pratiques autant que fondamentaux : elle permet notamment d'estimer certaines propriétés de surface (tension de surface / tension interfaciale) et la miscibilité de couples de polymères, au moyen du paramètre d'interaction khi. Cependant, la détermination expérimentale de telles propriétés est souvent menée de manière empirique, ou alors pour un nombre très limité de systèmes modèles. Dans cette étude, la modélisation moléculaire à l'échelle atomistique a été utilisée comme un outil d'étude des interactions locales intra- et inter- moléculaires, autorisant la caractérisation et la prédiction de grandeurs telles que : la densité d'énergie cohésive, le volume spécifique (comportement PVT) et la tension de surface dans un grand domaine de température. Ceci a été réalisé pour une large gamme de polymères amorphes depuis le PS et le PMMA considérés comme références jusqu'aux polymères de hautes performances tels que les polyéthers aromatiques de haute Tg ou des polyépoxy de structures variées. Les propriétés déterminées en modélisation moléculaire sont comparées aux données expérimentales, directes ou indirectes, que nous avons obtenues avec ces mêmes systèmes. Cette confrontation fait intervenir des modèles et des définitions qui diffèrent souvent entre l'expérience et la simulation, ainsi que des différences systématiques inhérentes à l'échelle limitée de la modélisation, par exemple en termes de température de transition vitreuse ou de tension de surface. L'aspect prédictif des simulations doit être considéré dans le sens où, pour une propriété donnée, la simulation et l'expérience fournissent un classement identique des différents polymères.
Book Description
La modélisation des propriétés cohésives de polymères amorphes présente de nombreux intérêts, pratiques autant que fondamentaux : elle permet notamment d'estimer certaines propriétés de surface (tension de surface / tension interfaciale) et la miscibilité de couples de polymères, au moyen du paramètre d'interaction khi. Cependant, la détermination expérimentale de telles propriétés est souvent menée de manière empirique, ou alors pour un nombre très limité de systèmes modèles. Dans cette étude, la modélisation moléculaire à l'échelle atomistique a été utilisée comme un outil d'étude des interactions locales intra- et inter- moléculaires, autorisant la caractérisation et la prédiction de grandeurs telles que : la densité d'énergie cohésive, le volume spécifique (comportement PVT) et la tension de surface dans un grand domaine de température. Ceci a été réalisé pour une large gamme de polymères amorphes depuis le PS et le PMMA considérés comme références jusqu'aux polymères de hautes performances tels que les polyéthers aromatiques de haute Tg ou des polyépoxy de structures variées. Les propriétés déterminées en modélisation moléculaire sont comparées aux données expérimentales, directes ou indirectes, que nous avons obtenues avec ces mêmes systèmes. Cette confrontation fait intervenir des modèles et des définitions qui diffèrent souvent entre l'expérience et la simulation, ainsi que des différences systématiques inhérentes à l'échelle limitée de la modélisation, par exemple en termes de température de transition vitreuse ou de tension de surface. L'aspect prédictif des simulations doit être considéré dans le sens où, pour une propriété donnée, la simulation et l'expérience fournissent un classement identique des différents polymères.
Author: Ahmed Belasri Publisher: Springer Nature ISBN: 9811554447 Category : Technology & Engineering Languages : en Pages : 659
Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Description
Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Author: H. R. Sasse Publisher: Springer ISBN: Category : Science Languages : en Pages : 792
Book Description
Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.
Author: Alfonso Jiménez Publisher: Royal Society of Chemistry ISBN: 1849738793 Category : Science Languages : en Pages : 374
Book Description
A comprehensive overview of the synthesis, characterisation, properties and applications of poly(lactic acid) science and technology covering scientific, ecological, social and economic issues.
Author: Jin Huang Publisher: John Wiley & Sons ISBN: 3527342699 Category : Technology & Engineering Languages : en Pages : 514
Book Description
Comprehensively introduces readers to the production, modifications, and applications of nanocellulose This book gives a thorough introduction to the structure, properties, surface modification, theory, mechanism of composites, and functional materials derived from nanocellulose. It also provides in-depth descriptions of plastics, composites, and functional nanomaterials specifically derived from cellulose nanocrystals, cellulose nanofibrils, and bacterial cellulose. It includes the most recent progress in developing a conceptual framework of nanocellulose, as well as its numerous applications in the design and manufacture of nanocomposites and functional nanomaterials. The book also looks at the relationship between structure and properties. Featuring contributions from many noted experts in the field, Nanocellulose: From Fundamentals to Advanced Materials examines the current status of nanocomposites based on nanocelluloses. It covers surface modification of nanocellulose in the nanocomposites development; reinforcing mechanism of cellulose nanocrystals in nanocomposites; and advanced materials based on self-organization of cellulose nanocrystals. The book studies the role of cellulose nanofibrils in nanocomposites, as well as a potential application based on colloidal properties of cellulose nanocrystals. It also offers strategies to explore biomedical applications of nanocellulose. Provides comprehensive knowledge on the topic of nanocellulose, including the preparation, structure, properties, surface modification and strategy Covers new reports on the application of nanocellulose Summarizes three kinds of nanocellulose (cellulose nanocrystals, cellulose nanofibrils, and bacterial cellulose) and their production, modification, and applications Nanocellulose: From Fundamentals to Advanced Materials is a useful resource for specialist researchers of chemistry, materials, and nanotechnology science, as well as for researchers and students of the subject.
Author: Bo Song Publisher: Springer ISBN: 3319224522 Category : Technology & Engineering Languages : en Pages : 265
Book Description
Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Author: J. Roorda Publisher: Springer Science & Business Media ISBN: 9401154767 Category : Technology & Engineering Languages : en Pages : 393
Book Description
The desire to understand the mechanics of elastic and plastic solids, new materials and the stability, reliability and dynamic behaviour of structures and their components under extreme environmental conditions has dominated research in structural engineering for many decades. Advances in these areas have revolutionized design methods, codes of practice, and the teaching of structural engineers. In this volume an international body of leading authorities presents some forty papers on current research directions in the specific areas of solid mechanics, structural computation, modern materials and their application, buckling and instability, design of structural systems and components, reliability, seismic analysis, and engineering education. They were presented at a symposium held July 10-12, 1994, at the University of Waterloo, Canada, to honour Professor Archibald Norbert Sherbourne who recently retired from a long and active career of teaching, research and academic administration at this University. The themes of the work contained within this volume reflect Professor Sherbourne's own research interests and will be of interest to both academics and practicing structural engineers.
Author: Jean-Paul Kurtz Publisher: Springer Science & Business Media ISBN: 0306484749 Category : Technology & Engineering Languages : en Pages : 1520
Book Description
I am pleased to present a work which marks a milestone in the history of public works and, more precisely, in that of permanent structures—a comprehensive dictionary of Civil Engineering terms. Since the beginning of time, Man has always tried to find a means to clear the obstacles which nature erected to displace him. With the first tree trunk thrown across a river, man sought to improve the crossing structure. After the invention of the wheel, and to satisfy his thirst for conquest (Roman ways), and comfort (aqueducts), man built bridges that became a preremptory necessity to move quickly. Thus, Man started to build wooden and masonry works. With the passing centuries, the builders became masters in the art of building masonry works. Then came the Industrial Revolution and the advent of the steel (1864), which was closely followed by the invention of the reinforced concrete (1855). The need for railways and improving the road network inspired great works of crossing such as viaducts and tunnels. The boom of the railway network and the development of the car required the construction of an increasing number of new structures. This phenomenon continues today with hundreds of structures built each year throughout the world.
Author: Sylvain Goudeau
Author: Sylvain Goudeau
Author: Ahmed Belasri
Author: Leslie Rainer
Author: H. R. Sasse
Author: Alfonso Jiménez
Author: Jin Huang
Author: Bo Song
Author: Hans Georg Wiedemann
Author: J. Roorda
Author: Jean-Paul Kurtz