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Author: Thi Khuyen Hoang
Publisher:
ISBN:
Category :
Languages : fr
Pages : 138
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Book Description
Ce travail de thèse se consacre à l'étude de molécules, de matériaux et de nano objets à propriétés optiques non linéaires (ONL) quadratiques. Dans un premier temps, nous avons étudié un polymère électro optique à base de polyméthacrylate de méthyle greffé par un nouveau colorant non linéaire. Une susceptibilité non linéaire de 43pm/V a été obtenue par génération de second harmonique à 1,91 ltm ; nous l'avons comparée à la valeur calculée à partir du modèle de Langevin sur l'orientation de dipôles sous champ électrique. Dans un deuxième temps, nous nous sommes intéressés à des complexes métalliques et organométalliques, en étudiant la possibilité de commuter leur hyperpolarisabilité, soit par modification de la longueur de conjugaison des ligands sous irradiation optique (photochromes), soit par transformation du caractère redox des donneurs ou des accepteurs d'électrons dans un système conjugué unidimensionnel. Enfin, nous avons étudié les propriétés ONL de dérivés du 4 diméthylamino N méthyl 4 stilbazolium tosylate (DAST), et en particulier la possibilité d'exalter leur hyperpolarisabilité par des nanoparticules d'or. Des mesures de diffusion harmonique de la lumière ont permis de mettre en évidence une nette augmentation de l'hyperpolarisabilité (d'un facteur 2) par molécule de dérivé de DAST, en régime non résonant, en présence de nanoparticules d'or, qu'elles soient attachées à cette molécule ou simplement mélangées avec elle dans un solvant commun
Author: Thi Khuyen Hoang
Publisher:
ISBN:
Category :
Languages : fr
Pages : 138
Get Book Here
Book Description
Ce travail de thèse se consacre à l'étude de molécules, de matériaux et de nano objets à propriétés optiques non linéaires (ONL) quadratiques. Dans un premier temps, nous avons étudié un polymère électro optique à base de polyméthacrylate de méthyle greffé par un nouveau colorant non linéaire. Une susceptibilité non linéaire de 43pm/V a été obtenue par génération de second harmonique à 1,91 ltm ; nous l'avons comparée à la valeur calculée à partir du modèle de Langevin sur l'orientation de dipôles sous champ électrique. Dans un deuxième temps, nous nous sommes intéressés à des complexes métalliques et organométalliques, en étudiant la possibilité de commuter leur hyperpolarisabilité, soit par modification de la longueur de conjugaison des ligands sous irradiation optique (photochromes), soit par transformation du caractère redox des donneurs ou des accepteurs d'électrons dans un système conjugué unidimensionnel. Enfin, nous avons étudié les propriétés ONL de dérivés du 4 diméthylamino N méthyl 4 stilbazolium tosylate (DAST), et en particulier la possibilité d'exalter leur hyperpolarisabilité par des nanoparticules d'or. Des mesures de diffusion harmonique de la lumière ont permis de mettre en évidence une nette augmentation de l'hyperpolarisabilité (d'un facteur 2) par molécule de dérivé de DAST, en régime non résonant, en présence de nanoparticules d'or, qu'elles soient attachées à cette molécule ou simplement mélangées avec elle dans un solvant commun
Author: Julien Venturini
Publisher:
ISBN:
Category :
Languages : fr
Pages :
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Author: Max Giordano
Publisher: John Wiley & Sons
ISBN: 1118587529
Category : Business & Economics
Languages : en
Pages : 389
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Book Description
This book gives a comprehensive view of the most recent major international research in the field of tolerancing, and is an excellent resource for anyone interested in Computer Aided Tolerating. It is organized into 4 parts. Part 1 focuses on the more general problems of tolerance analysis and synthesis, for tolerancing in mechanical design and manufacturing processes. Part 2 specifically highlights the simulation of assembly with defects, and the influence of tolerances on the quality of the assembly. Part 3 deals with measurement aspects, and quality control throughout the life cycle. Different measurement technologies and methods for estimating uncertainty are considered. In Part 4, different aspects of tolerancing and their interactions are explored, from the definition of functional requirement to measurement processes in a PLM approach.
Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270
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Book Description
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Author: Lisa H. WEASEL Ph.D.
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0814401783
Category : Technology & Engineering
Languages : en
Pages : 258
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Book Description
More than ten years ago, the first genetically modified foods took their place on the shelves of American supermarkets. But while American consumers remained blissfully unconcerned with the new products that suddenly filled their kitchens, Europeans were much more wary of these “Frankenfoods.” When famine struck Africa in 2002, several nations refused shipments of genetically modified foods, fueling a controversy that put the issue on the world's political agenda for good. In Food Fray, esteemed molecular biologist Dr. Lisa H. Weasel brings readers into the center of this debate, capturing the real-life experiences of the scientists, farmers, policymakers and grassroots activists on the front lines. Here she combines solid scientific knowledge and a gripping narrative to tell the real story behind the headlines and the hype. Seminal and cutting-edge, Food Fray enlightens and informs and will allow readers to make up their own minds about one of the most important issues facing us today.
Author: Jef Caers
Publisher: John Wiley & Sons
ISBN: 1119998719
Category : Science
Languages : en
Pages : 294
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Book Description
Modeling Uncertainty in the Earth Sciences highlights the various issues, techniques and practical modeling tools available for modeling the uncertainty of complex Earth systems and the impact that it has on practical situations. The aim of the book is to provide an introductory overview which covers a broad range of tried-and-tested tools. Descriptions of concepts, philosophies, challenges, methodologies and workflows give the reader an understanding of the best way to make decisions under uncertainty for Earth Science problems. The book covers key issues such as: Spatial and time aspect; large complexity and dimensionality; computation power; costs of 'engineering' the Earth; uncertainty in the modeling and decision process. Focusing on reliable and practical methods this book provides an invaluable primer for the complex area of decision making with uncertainty in the Earth Sciences.
Author: Gerald McNerney
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0814413722
Category : Business & Economics
Languages : en
Pages : 321
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Book Description
Americans are already feeling the pressures of the current energy situation, and many of us are ready to make a change. Clean Energy Nation is a timely and hopeful look at an issue we can't afford to ignore. --Book Jacket.
Author: Pam Helling
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0761214135
Category : Business writing
Languages : en
Pages : 132
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Book Description
Positive, practical techniques for achieving a more professional writing style. Here are the "how to" keys of writing-from putting the first words on paper to the final polishing and proofreading. Readers will learn how to edit their writing for improved clarity, cut excess words, use transitional phrases, recognize and correct run-on sentences and overcome procrastination and impulsive writing. Readers will learn how to: Identify the key components of any well-written business document Cut excess words and phrases from your writing Use transitional words and phrases Avoid misplaced and dangling modifiers and split infinitives Use commas, semicolons, colons, dashes, and parentheses Use slash marks, ellipsis marks, quotation marks, italics, and brackets Recognize and correct run-on sentences Proofread your writing for clarity of meaning Overcome the two common writing problems that waste time and money-procrastination and impulsive writing. This is an ebook version of the AMA Self-Study course. If you want to take the course for credit you need to either purchase a hard copy of the course through amaselfstudy.org or purchase an online version of the course through www.flexstudy.com.
Author: Lawrence WEBBER
Publisher: AMACOM Div American Mgmt Assn
ISBN: 0814414478
Category : Business & Economics
Languages : en
Pages : 306
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Book Description
With today’s electronic systems consuming massive amounts of energy, and improper disposal of old equipment threatening to release dangerous toxicity into the atmosphere, any company whose IT department isn’t actively working to shrink its carbon footprint isn’t just hurting the environment...it is also probably wasting money. Green Tech provides readers with practical, easily implemented strategies for sustainable computing, showing them how to: • build a business case to influence their organization's green strategy • reduce costs and improve equipment utilization while maintaining current customer service levels • identify old equipment at all levels, as well as suitable green replacements • virtualize servers • find alternative methods for data center cooling • conduct an energy audit and establish an energy baseline • determine the best options for recycling or donating old equipment Filled with realistic, cost-efficient ideas, this book shows that going green isn’t just the right thing to do, but also a good business strategy.
