Download or read book Transistors effet de champ sur substrat InP canaux composites written by Hassan Maher and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Conception et r alisation de transistors effet de champ de la fili re AlInAs GaInAs sur substrat InP written by Pascal Chevalier (ingénieur).) and published by . This book was released on 1998 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'essor des applications hyperfrequences fonctionnant en ondes millimetriques necessite le developpement de nouvelles filieres de circuits integres. Un composant clef de ces circuits est le transistor a effet de champ a heterojonction : le hemt (high electron mobility transistor). Nous developpons dans ce memoire les resultats de l'etude de hemt alinas/gainas realises sur phosphure d'indium (inp). Apres avoir introduit les bases relatives au fonctionnement et aux domaines d'applications de ce transistor, nous presentons les outils theoriques et experimentaux utilises pour nos travaux. Ces derniers contribuent d'une part a la mise au point technologique et d'autre part a l'optimisation de la structure epitaxiale. Les recherches menees en technologie concernent principalement la technologie de grille et plus particulierement la lithographie electronique des grilles en te en tricouche de resines. La realisation de grilles de 100 nm de longueur, de faible resistivite, a permis la fabrication de transistors performants, presentant notamment une frequence de coupure extrinseque f#t proche de 250 ghz et une transconductance intrinseque de 1,5 s/mm. L'optimisation de l'epitaxie, visant a depasser les limitations des transistors a canal gainas adapte en maille sur le substrat, a conduit a l'etude des canaux composites gainas/inp. Nous avons mis en evidence leur efficacite pour reduire le phenomene d'ionisation par impact et ainsi ameliorer les performances du composant. Les performances en puissance de transistors a canal gainas/inp/inp n#+ (355 mw/mm a 60 ghz) ont montre toutes les potentialites de structures a canal composite pour la generation de puissance en ondes millimetriques.

Download or read book Conception et r alisation de transistors effet de champ h t rojonction sur substrat InP pour amplification de puissance en bande W written by Farid Medjdoub and published by . This book was released on 2004 with total page 173 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce procédé nous permet d'éloigner la surface du gaz bidimensionnel de manière à obtenir un courant de drain élevé et éviter l'effet kink tout en maintenant un rapport d'aspect favorable pour les grilles sub-1OO nm. Il apparaît que les fréquences de coupure Ft évoluent de manière croissante en fonction de la réduction de la longueur de grille. Nous avons atteint des fréquences Ft et Fmax respectives de 210 GHz et 420 GHz. Ce procédé étant validé, nous l'avons appliqué aux structures comportant des canaux tels que l'InP et l'InAsP. Nous sommes parvenus à une fréquence de coupure de 125 GHz et une fréquence maximum d'oscillation de 380 GHz avec une grille de 50 nm pour la structure à canal InP, ce qui représentent les meilleures performances fréquentielles obtenues jusqu'à présent sur ce type de composant. Sur la structure à canal InAsP, nous atteignons une fréquence de coupure de 140 GHz, une fréquence maximum d'oscillation de 430 GHz et un gain maximum disponible à 94 GHz de 13 dB avec une grille de 70 nm. Sa faible ̧conductance de sortie comparée à la structure à canal GaInAs, associée à la barrière composite nous a permis d'atteindre l'état de l'art mondial en puissance des HÉMTs sur substrat InP.

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dorland s Dictionary of Medical Acronyms and Abbreviations E Book written by Dorland and published by Elsevier Health Sciences. This book was released on 2015-07-24 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Medical acronyms and abbreviations offer convenience, but those countless shortcuts can often be confusing. Now a part of the popular Dorland’s suite of products, this reference features thousands of terms from across various medical specialties. Its alphabetical arrangement makes for quick reference, and expanded coverage of symbols ensures they are easier to find. Effective communication plays an important role in all medical settings, so turn to this trusted volume for nearly any medical abbreviation you might encounter. Symbols section makes it easier to locate unusual or seldom-used symbols. Convenient alphabetical format allows you to find the entry you need more intuitively. More than 90,000 entries and definitions. Many new and updated entries including terminology in expanding specialties, such as Nursing; Physical, Occupational, and Speech Therapies; Transcription and Coding; Computer and Technical Fields. New section on abbreviations to avoid, including Joint Commission abbreviations that are not to be used. Incorporates updates suggested by the Institute for Safe Medication Practices (ISMP).

Download or read book Dictionary of Medical Acronyms and Abbreviations written by Stanley Jablonski and published by Hanley & Belfus. This book was released on 2004-09 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dictionary lists acronyms and abbreviations occurring with a reasonable frequency in the literature of medicine and the health care professions. Abbreviations and acronyms are given in capital letters, with no punctuation, and with concise definitions. The beginning sections also include symbols, genetic symbols, and the Greek alphabet and symbols.

Download or read book Organic Solid State Lasers written by Sébastien Forget and published by Springer. This book was released on 2013-07-03 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.

Download or read book Stored grain Insects written by United States. Agricultural Research Service and published by . This book was released on 1978 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Laser 50 Years Of Discoveries written by Fabien Bretenaker and published by World Scientific. This book was released on 2014-10-27 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book provides an overview of the principle and applications of lasers enriched with numerous illustrations.Being over fifty years old, lasers continue to amaze us. Their performance characteristics are constantly reaching new limits, and the scope of their applications continues to expand. Yet, it took years of effort by teams of physicists to transform the fundamental notions of Einstein into the first experimental beam of laser light. And history is still going on as fundamental research is now triggered by its remarkable properties.This book addresses every aspects of laser light, from its fundamental principles to its industrial applications, at a level particularly suited for high school teachers, students, and anybody curious about science and technology.

Download or read book Quantum Communications and Cryptography written by Alexander V. Sergienko and published by CRC Press. This book was released on 2018-10-03 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.

Download or read book Electromagnetic Metrology written by and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Antennas for Global Navigation Satellite Systems written by Xiaodong Chen and published by John Wiley & Sons. This book was released on 2012-02-21 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to educate the reader on the most important aspects of GNSS antenna technology, this book covers the theory and design of antennas suitable for a Global Navigation Satellite System (GNSS). Various aspects of GNSS antennas are discussed, including the fundamentals of GNSS, design approaches for the GNSS terminal and satellite antennas, performance enhancement techniques used for such antennas, and the effects of the user's presence and surrounding environment on these antennas. It also provides a number of real case studies detailing ways in which antenna design can be adapted to conform to the design constraints of practical user devices. A must for antenna designers, system engineers, and researchers for GNSS systems.

Download or read book All it Is It s a Carnival written by Mária Németh Lenke and published by . This book was released on 2007 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.

Download or read book Nanofabrication written by Maria Stepanova and published by Springer Science & Business Media. This book was released on 2011-11-08 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intended to update scientists and engineers on the current state of the art in a variety of key techniques used extensively in the fabrication of structures at the nanoscale. The present work covers the essential technologies for creating sub 25 nm features lithographically, depositing layers with nanometer control, and etching patterns and structures at the nanoscale. A distinguishing feature of this book is a focus not on extension of microelectronics fabrication, but rather on techniques applicable for building NEMS, biosensors, nanomaterials, photonic crystals, and other novel devices and structures that will revolutionize society in the coming years.