Download or read book Acc l ration Laser de Particules Charg es Et G n ration de Forts Champs Associ s Des Courants de D charge Induite Par Laser written by Michael Ehret and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work aims at both, the experimental benchmark of laser-driven ion acceleration from targets in the near-critical density regime and the exploration of laser-driven open-geometry platforms for spatial and spectral ion beam tailoring. Theoretically described mechanisms and dynamics predicted by numerical simulations are compared to novel experimental findings that are supported by new particle in cell simulations and heuristic models. Results comprise (i) demonstration of Helium ion acceleration from ultra-relativistic laser-driven near-critical density gas jet targets employing shock nozzles, (ii) further investigation of the driving mechanisms of charged particle beam lensing platforms in the quasi-static regime driven by ns-laser and in the transient regime driven by sub-ps laser, and (iii) studies of transport and tailoring of laser accelerated particle beams by electromagnetic and magnetic fields.The Helium ion source shows cut-off energies above 55MeV and peaked particle number densities of several 1e8/MeV for 22(2)MeV projectiles, a regime suitable for isotope production in alpha-therapy. Hence, the destruction of nozzles in the violent experimental environment and the perspective to high-repetition-rate operation underlines the need of mass producible nozzles with automatized nozzle exchange and vacuum systems able to maintain good vacuum levels.Ns-laser driven magnetic lenses show comparable current amplitudes in the spontaneous magnetic fields of the plasma and the consumer loop, which favors the theoretical modeling of the platform as a plasma-diode power source. During the laser drive, space charge effects arise with the arrival of the laser-plasma in vicinity of the magnetic lens, representing a possible threat to efficient lensing of ion beams. A modified target geometry is presented that decreases space charge effects.Short laser-pulse driven solid target discharge gives rise to a surficial pulsed potential dynamics guided by the target geometry. This work shows that electromagnetic discharge pulses emanating the interaction region are followed by a pulse discharge current from the ground, both transporting kA-range currents through the target rod. The observed pulsed current dynamics on timescales of tens of ps indicates the presence of a hot surface plasma. The temperature and electron density of the surface plasma are promising control parameters of the discharge pulse dispersion. The high branch of the dispersion relation is responsible for a group velocity different from the speed of light. Solutions on the low branch of the dispersion relation agree with modulations of the target potential in their spatial dimensions and temporal growth rate.Experimental and numerical studies of short laser pulse driven platforms show their applicability to spectral shaping of ion beams, with a perspective to temporal compression of beams for cases where low energy parts of the spectrum get efficiently post-accelerated. Presented are the experimental study of a simple double-coil geometry and a numerical study of a helical coil target.This work motivates junction of presented approaches for future experiments aiming at high repetition rate laser accelerated high energy density ion beams for applications, notably medical isotope production, or fundamental research, ranging from studies on collective stopping effects, warm dense matter generation to an optimized fast ignition particle injector.
Download or read book ETUDE DU SILLAGE LASER written by Fabien Dorchies and published by . This book was released on 1998 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS LE BUT D'ACCELERER DES PARTICULES CHARGEES AVEC DES CHAMPS ELECTRIQUES SUPERIEURS AUX LIMITES ACTUELLES DES CAVITES ACCELERATRICES CONVENTIONNELLES (DE L'ORDRE DE 100 MV/M), PLUSIEURS MECANISMES UTILISANT UNE ONDE PLASMA ELECTRONIQUE EXCITEE PAR LA FORCE PONDEROMOTRICE D'UNE IMPULSION LASER INTENSE ONT ETE PROPOSES. PARMI CEUX-CI, LE SILLAGE LASER SEMBLE LE PLUS PROMETTEUR : UNE IMPULSION LASER ULTRA-COURTE ( 1 PS) ET ULTRA-INTENSE ( 10#1#7 W.CM##2) SE PROPAGEANT DANS UN PLASMA SOUS-DENSE (DE L'ORDRE DE 10#1#7 ELECTRONS PAR CM#3), EXCITE DANS SON SILLAGE UNE ONDE PLASMA ELECTRONIQUE DE FORTE AMPLITUDE. LE CHAMP ELECTRIQUE LONGITUDINAL ASSOCIE A CETTE ONDE PEUT ETRE TRES ELEVE ET ACCELERER EFFICACEMENT DES ELECTRONS INJECTES. CETTE THESE PRESENTE UNE ETUDE EXPERIMENTALE DE CE MECANISME. DANS UN PREMIER TEMPS, L'ONDE PLASMA EXCITEE PAR SILLAGE LASER A ETE MESUREE OPTIQUEMENT EN UTILISANT LE DIAGNOSTIC D'INTERFEROMETRIE FREQUENTIELLE. CETTE PREMIERE SERIE D'EXPERIENCES A PERMIS DE MONTRER LA VALIDITE DE LA THEORIE LINEAIRE DU SILLAGE DANS UN REGIME FORTEMENT RADIAL, JUSQU'A UNE AMPLITUDE RELATIVE DE L'ORDRE DE 100%. UNE EXPERIENCE A ETE CONCUE ET ETUDIEE DANS UN REGIME LONGITUDINAL. LORS D'UNE AUTRE EXPERIENCE, DES ELECTRONS ONT ETE INJECTES DANS L'ONDE PLASMA. DES ELECTRONS ACCELERES PAR UN CHAMP DE L'ORDRE DE 1 GV/M ONT ETE OBSERVES. A NOUVEAU, LA THEORIE LINEAIRE DU SILLAGE PERMET DE RENDRE COMPTE DES RESULTATS OBSERVES. CETTE EXPERIENCE A NOTAMMENT MONTRE L'INFLUENCE DES CHAMPS ELECTRIQUES RADIAUX ASSOCIES A L'ONDE PLASMA SUR LA QUALITE DE L'ACCELERATION. CETTE ACCELERATION EST LIMITEE PAR LA LONGUEUR SUR LAQUELLE EXISTE L'ONDE PLASMA, C'EST A DIRE PAR LA LONGUEUR DE RAYLEIGH DU FAISCEAU LASER. UN MOYEN D'AUGMENTER LE GAIN D'ENERGIE DES ELECTRONS EST DE GUIDER L'IMPULSION LASER INTENSE SUR DE PLUS GRANDES LONGUEURS. DANS CETTE OPTIQUE, UNE PREMIERE EXPERIENCE DE GUIDAGE DANS UN CAPILLAIRE DIELECTRIQUE CREUX A ETE REALISEE.
Download or read book Offshore Power Systems written by Faye H. Horn and published by . This book was released on 1974 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quantum Theory of Finite Systems written by Jean-Paul Blaizot and published by Mit Press. This book was released on 1986 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and pedagogical account of the various methods used in the quantum theory of finite systems, including molecular, atomic, nuclear, and particle phenomena. Covering both background material and advanced topics and including nearly 200 problems, Quantum Theory of Finite Systems has been designed to serve primarily as a text and will also prove useful as a reference in research. The first of the book's four parts introduces the basic mathematical apparatus: second quantization, canonical transformations, Wick theorems and the resulting diagram expansions, and oscillator models. The second part presents mean field approximations and the recently developed path integral methods for the quantization of collective modes. Part three develops perturbation theory in terms of both time-dependent Feynman diagrams and time-independent Goldstone diagrams. A fourth part discusses variational methods based on correlated wavefunctions, including spin correlations. The approximation schemes are formulated for fermions and bosons at eigher zero or non-zero temperature. Although the formalism developed applies to both finite and infinite systems, the book stresses those aspects of the theory that are specific to the description of finite systems. Thus special attention is given to mean field approximations, the ensuing broken symmetries, and the associated collective motions such as rotations. Conversely, some specific features of systems with infinite numbers of degrees of freedom (such as the thermodynamic limit, critical phenomena, and the elimination of ultraviolet divergencies) are deliberately omitted. Jean-Paul Blaizot and Georges Ripka are associated with the Centre d'Etudes Nucleaires de Saclay.
Download or read book X Ray and Neutron Reflectivity Principles and Applications written by Jean Daillant and published by Springer Science & Business Media. This book was released on 2003-07-01 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reflection of and neutrons from surfaces has existed as an x-rays exp- imental for almost it is in the last technique fifty Nevertheless, only years. decade that these methods have become as of enormously popular probes This the surfaces and interfaces. to be due to of several appears convergence of intense different circumstances. These include the more n- availability be measured orders tron and sources that can over (so reflectivity x-ray many of and the much weaker surface diffuse can now also be magnitude scattering of thin films and studied in some the detail); growing importance multil- basic the realization of the ers in both and technology research; important which in the of surfaces and and role roughness plays properties interfaces; the of statistical models to characterize the of finally development topology its and its characterization from on roughness, dependence growth processes The of and to surface scattering experiments. ability x-rays neutro4s study four five orders of in scale of surfaces over to magnitude length regardless their and also their to ability probe environment, temperature, pressure, etc. , makes these the choice for buried interfaces often probes preferred obtaining information about the microstructure of often in statistical a global surfaces, the local This is manner to complementary imaging microscopy techniques, of such studies in the literature witnessed the veritable by explosion published the last few Thus these lectures will useful for over a resource years.
Download or read book Invasive Species in the Pacific written by Greg Sherley and published by . This book was released on 2000 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phytochemicals in Nutrition and Health written by Mark S. Meskin and published by CRC Press. This book was released on 2002-03-19 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Are soy isoflavones neuroprotective? Just how different is one species of Echinacea from another? Which phytochemicals will be effective as therapeutic agents in vivo? Supported by solid scientific research, Phytochemicals in Nutrition and Health helps provide answers to these and other probing questions concerning the mechanisms of action associat
Download or read book Anticancer Molecules written by Hiroshi Maruta and published by . This book was released on 1999 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume discusses the value of research on tumor suppressor genes and the structure-function relationship of the corresponding proteins. The applicability of these non-peptide molecules to anti-cancer drugs is also taken up; and by focusing on contemporary research issues in the field, the book aims to promote understanding and cooperation between industrial and academic researchers.
Download or read book Modern Approaches to Terminological Theories and Applications written by Heribert Picht and published by Peter Lang. This book was released on 2006 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume comprises contributions originally presented at the 15th European Symposium on Languages for Special Purposes held at the University of Bergamo on 29 August - 2 September 2005. The volume is divided into four parts: Approaches to Terminological Theories; Terms in Discourse; Knowledge Elicitation, Ordering and Management; Term extraction and terminographical work. The research presented in the various contributions to this volume clearly indicates that terminology as an inter- and transdisciplinary field of knowledge is firmly developing its theoretical foundations and practical applications in accordance with and within the framework of its overall goal: to ensure and to augment the quality of communication with professional content.
Download or read book Languages for Special Purposes written by John Humbley and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-10-22 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook gives an overview of language for special purposes (LSP) in scientific, professional and other contexts, with particular focus on teaching and training. It provides insights into research paradigms, theories and methods while also highlighting the practical use of LSPs in concrete discourse situations. The volume is transdisciplinary oriented with a firm basis in the language sciences, including terminology, knowledge transfer, multilingual and cross-cultural exchange.
Download or read book Microbial Biotechnology Basic Research and Applications written by Joginder Singh and published by Springer Nature. This book was released on 2020-07-07 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microbial biotechnology is an important area that promotes advanced research into using microbes for value-added products, human nutrition, and the overall wellbeing of society. This book presents the latest information on the use of microbes for sustainable development, and highlights state-of-the-art biotechnological techniques used to harness microbial biotechnological traits on a commercial scale. Gathering contributions from authoritative researchers in the field, it addresses recent advances in microbial biotechnological approaches that offer sustainable options for future generations. Exploring a broad range of microbial products and their uses, the book specifically places emphasis on the application of microorganisms in healthcare, the environment and industry. It also discusses various compound classes derived from microbial metabolites. Pursuing a holistic approach to recent advances in the utilization of various microbes as biotechnological tools, the book also covers traditional uses, and explores emerging strategies to harness their full potential. Accordingly, it offers a valuable resource for researchers and graduate students alike.
Download or read book Indigenous Men and Masculinities written by Robert Alexander Innes and published by Univ. of Manitoba Press. This book was released on 2015-11-06 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: What do we know of masculinities in non-patriarchal societies? Indigenous peoples of the Americas and beyond come from traditions of gender equity, complementarity, and the sacred feminine, concepts that were unimaginable and shocking to Euro-western peoples at contact. "Indigenous Men and Masculinities", edited by Kim Anderson and Robert Alexander Innes, brings together prominent thinkers to explore the meaning of masculinities and being a man within such traditions, further examining the colonial disruption and imposition of patriarchy on Indigenous men. Building on Indigenous knowledge systems, Indigenous feminism, and queer theory, the sixteen essays by scholars and activists from Canada, the U.S., and New Zealand open pathways for the nascent field of Indigenous masculinities. The authors explore subjects of representation through art and literature, as well as Indigenous masculinities in sport, prisons, and gangs. "Indigenous Men and Masculinities" highlights voices of Indigenous male writers, traditional knowledge keepers, ex-gang members, war veterans, fathers, youth, two-spirited people, and Indigenous men working to end violence against women. It offers a refreshing vision toward equitable societies that celebrate healthy and diverse masculinities.
Download or read book Special Language written by Christer Laurén and published by Multilingual Matters. This book was released on 1989-01-01 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the most advanced human thinking is expressed by special language there are exciting possibilities for research in which philosophical, semantic, semiotic, text-linguistic and pragmatic approaches are utilized.
Download or read book Greek Painted Pottery written by Robert Manuel Cook and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Athenian Vase Construction written by Toby Schreiber and published by Getty Publications. This book was released on 1999-05-27 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on her study of Greek pottery sherds and vases and on her profound hands-on knowledge of pottery construction techniques, including experiments with the potting of Attic shapes, Toby Schreiber describes how ancient Greek potters constructed their vases. Drawn in large part from vases and fragments in the collection of the Getty Museum, the many photographs that accompany the text show how much even seemingly insignificant sherds may reveal about technique when studied by someone knowledgeable about potting. The drawings - all done by the author - demonstrate step by step with admirable clarity how the potter executed his craft. Written by a master potter, this is a book both for those who know little or nothing about potting techniques and for those who already have an understanding of these matters.
Download or read book Formal Ontology in Information Systems written by Brandon Bennett and published by IOS Press. This book was released on 2006 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers in areas such as artificial intelligence, formal and computational linguistics, biomedical informatics, conceptual modeling, knowledge engineering and information retrieval have come to realize that a solid foundation for their research calls for serious work in ontology, understood as a general theory of the types of entities and relations that make up their respective domains of inquiry. In all these areas, attention is now being focused on the content of information rather than on just the formats and languages used to represent information. The clearest example of this development is provided by the many initiatives growing up around the project of the Semantic Web. And, as the need for integrating research in these different fields arises, so does the realization that strong principles for building well-founded ontologies might provide significant advantages over ad hoc, case-based solutions. The tools of formal ontology address precisely these needs, but a real effort is required in order to apply such philosophical tools to the domain of information systems. ontological questions which call for further philosophical investigations. The purpose of FOIS is to provide a forum for genuine interdisciplinary exchange in the spirit of a unified effort towards solving the problems of ontology, with an eye to both theoretical issues and concrete applications. This book contains a wide range of areas, all of which are important to the development of formal ontologies.
Download or read book Aerospace power in the twenty first century a basic primer written by Clayton K. S. Chun and published by DIANE Publishing. This book was released on 2001 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dr. Chun's Aerospace Power in the Twenty-First Century: A Basic Primer is a great start towards understanding the importance of aerospace power and its ability to conduct modern warfare. Aerospace power is continually changing because of new technology, threats, and air and space theories. However, many basic principles about aerospace power have stood the test of time and warfare. This book provides the reader with many of these time-tested ideas for consideration and reflection. Although Aerospace Power in the Twenty-First Century was written for future officers, individuals desiring a broad overview of aerospace power are invited to read, share, and discuss many of the ideas and thoughts presented here. Officers from other services will find that this introduction to air and space forces will give them a good grasp of aerospace power. More experienced aerospace leaders can use this book to revisit many of the issues that have affected air and space forces in the past and that might affect them in the future. Air Force officers will discover that Aerospace Power in the Twenty-First Century is a very timely and reflective resource for their professional libraries.
