Intérêt et influence des faisceaux d'ions dans l'étude de la croissance et de l'évolution de couches minces amorphes PDF Download

Author: Mireille Fallavier
Publisher:
ISBN:
Category :
Languages : fr
Pages : 119

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Author: Mireille Fallavier (auteur d'une thèse de sciences.)
Publisher:
ISBN:
Category :
Languages : fr
Pages : 119

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Author: M. Fallavier
Publisher:
ISBN:
Category :
Languages : en
Pages : 119

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Author: Corinne Gledel
Publisher:
ISBN:
Category :
Languages : en
Pages : 253

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This work is essentially devoted to the synthesis and study of amorphous thin films obtained from lamellar crystalline materials such as LixV2 05 (0 ≤ x ≤ 0.2), M11PS3 (M= Mn, Fe, Ni, Cd, Sn and ln2/3)The achievement of materials presenting a correct stoichiometry has required the realization of a flash evaporation device operating at 1500° C and adapted to allow quenching of the vapor at liquid nitrogen temperature.The amorphous thin films have been characterized by, optical and electron scanning microscopy, microscopy, microprobre, UV-visible and I.R. spectroscopies.Their electrical conductivity has been studied and compared with the crystalline parent compounds.The local atomic arrangement (short range order) of several MPS3 films has been studied using the E.X.A.F.S.technique. Results show that the films have the same basic structure as the parent crystalline compounds, but deviati0ns are observed, depending on the metal M.The possibility of applying these films to design new photovoltaic devices has been examined. Amorphous V205 and LixV205 films have n type semiconducting properties and they lead to photosensitive p-n junction when deposited on to p type silicon wafers.Finally, we have examined the possibility of synthesing new amorphous M3Ps4 materials either by flash evaporation and by a novel soft chemistry, i.e. synthesis by reaction M ions in acetonitrile on the PS4 3- Ligand.

Author: Edward A. Metzbower
Publisher: ASM International(OH)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 286

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Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299

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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: Goddard Space Flight Center. Office of Public Affairs
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 366

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Author: Paolo Mele
Publisher:
ISBN: 9781536160864
Category : Zinc oxide thin films
Languages : en
Pages : 0

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Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.

Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005023
Category : Computers
Languages : en
Pages : 190

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Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.

Author: Rob Flickenger
Publisher: "O'Reilly Media, Inc."
ISBN: 9780596005597
Category : Computers
Languages : en
Pages : 310

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Book Description
Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.