Download or read book Etude des non lin arit s dans les lasers contre r action distribu e written by Hans Bissessur and published by . This book was released on 1994 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE DEVELOPPEMENT DE LASERS A SEMI-CONDUCTEURS EMETTANT UNE PUISSANCE ELEVEE AVEC UN BON TAUX DE REJECTION DES MODES SECONDAIRES, ET PERFORMANTS DU POINT DE VUE DE LA REPONSE A UNE MODULATION OU DE LA LARGEUR DE RAIE EXIGE LA PRISE EN COMPTE DETAILLEE DU COUPLAGE PHOTONS-PORTEURS DANS LA CAVITE LASER. EN EFFET, LES DENSITES DE PHOTONS ET DE PORTEURS SONT GENERALEMENT INHOMOGENES LE LONG DE L'AXE DE PROPAGATION. NOUS PRESENTONS UN MODELE DETAILLE A BASE DE MATRICES DE TRANSFERT PERMETTANT DE CALCULER LA PUISSANCE ET LA LONGUEUR D'ONDE D'EMISSION, LE TAUX DE REJECTION DES MODES SECONDAIRES, AINSI QUE LES REPONSES DYNAMIQUES ET LA LARGEUR DE RAIE D'UN LASER DFB QUELCONQUE. NOUS MONTRONS QUE LES INHOMOGENEITES LIMITENT LA PLAGE DE FONCTIONNEMENT MONOMODE DU COMPOSANT ET INTRODUISENT DES NON-LINEARITES DANS LE COMPORTEMENT EN PUISSANCE ET EN LARGEUR DE RAIE. DES STRUCTURES A DEPHASAGES MULTIPLES SONT PROPOSEES POUR RELACHER LES CONTRAINTES SUR LE COEFFICIENT DE COUPLAGE, ET COMPAREES AUX STRUCTURES CLASSIQUES SANS DEPHASAGE OU AVEC UN DEPHASAGE UNIQUE D'UN QUART D'ONDE. L'ETUDE EXPERIMENTALE CONFIRME L'INTERET DES FAIBLES COEFFICIENTS DE COUPLAGE OU LE TRAITEMENT ANTI-REFLETS DE LA FACE DE SORTIE POUR L'OBTENTION DE BONS RENDEMENT SUR PLAQUE, AINSI QUE LA FORTE DEPENDANCE DE LA LARGEUR DE RAIE AVEC LA LONGUEUR DE CAVITE. L'ACCORDABILITE DES LASERS A ELECTRODES MULTIPLES EST ENSUITE ETUDIEE EN FONCTION DES COURANTS APPLIQUES. LES EFFETS THERMIQUES SONT INCLUS DANS LA MODELISATION. DIFFERENTES CONFIGURATIONS SONT EXAMINEES EN VUE D'OBTENIR UNE REPONSE FM (RESP. AM) IMPORTANTE ET PLATE A FAIBLE FREQUENCE. ENFIN, LA REPONSE EN GRANDS SIGNAUX EST MODELISEE, AVEC LES DIFFERENTS PARAMETRES PERMETTANT DE L'AMELIORER. L'INCLUSION DE LA COURBE DE GAIN EXACTE EST GENERALEMENT NECESSAIRE POUR UNE OPTIMISATION FINE DU COMPOSANT.
Download or read book Mummy Portraits of Roman Egypt written by Marie Svoboda and published by Getty Publications. This book was released on 2020-08-25 with total page 413 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication presents fascinating new findings on ancient Romano-Egyptian funerary portraits preserved in international collections. Once interred with mummified remains, nearly a thousand funerary portraits from Roman Egypt survive today in museums around the world, bringing viewers face-to-face with people who lived two thousand years ago. Until recently, few of these paintings had undergone in-depth study to determine by whom they were made and how. An international collaboration known as APPEAR (Ancient Panel Paintings: Examination, Analysis, and Research) was launched in 2013 to promote the study of these objects and to gather scientific and historical findings into a shared database. The first phase of the project was marked with a two-day conference at the Getty Villa. Conservators, scientists, and curators presented new research on topics such as provenance and collecting, comparisons of works across institutions, and scientific studies of pigments, binders, and supports. The papers and posters from the conference are collected in this publication, which offers the most up-to-date information available about these fascinating remnants of the ancient world. The free online edition of this open-access publication is available at www.getty.edu/publications/mummyportraits/ and includes zoomable illustrations and graphs. Also available are free PDF, EPUB, and Kindle/MOBI downloads of the book.
Download or read book Basics of Geomatics written by Mario A. Gomarasca and published by Springer Science & Business Media. This book was released on 2009-09-18 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geomatics is a neologism, the use of which is becoming increasingly widespread, even if it is not still universally accepted. It includes several disciplines and te- niques for the study of the Earth’s surface and its environments, and computer science plays a decisive role. A more meaningful and appropriate expression is G- spatial Information or GeoInformation. Geo-spatial Information embeds topography in its more modern forms (measurements with electronic instrumentation, sophisticated techniques of data analysis and network compensation, global satellite positioning techniques, laser scanning, etc.), analytical and digital photogrammetry, satellite and airborne remote sensing, numerical cartography, geographical information systems, decision support systems, WebGIS, etc. These specialized elds are intimately interrelated in terms of both the basic science and the results pursued: rigid separation does not allow us to discover several common aspects and the fundamental importance assumed in a search for solutions in the complex survey context. The objective pursued by Mario A. Gomarasca, one that is only apparently modest, is to publish an integrated text on the surveying theme, containing simple and comprehensible concepts relevant to experts in Geo-spatial Information and/or speci cally in one of the disciplines that compose it. At the same time, the book is rigorous and synthetic, describing with precision the main instruments and methods connected to the multiple techniques available today.
Download or read book Natural Resources and Violent Conflict written by Ian Bannon and published by World Bank Publications. This book was released on 2003-01-01 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research carried out by the World Bank on the root causes of conflict and civil war finds that a developing country's economic dependence on natural resources or other primary commodities is strongly associated with the risk level for violent conflict. This book brings together a collection of reports and case studies that explore what the international community in particular can do to reduce this risk.; The text explains the links between natural resources and conflict and examines the impact of resource dependence on economic performance, governance, secessionist movements and revel financing. It then explores avenues for international action - from financial and resource reporting procedures and policy recommendations to commodity tracking systems and enforcement instruments, including sanctions, certification requirements, aid conditionality, legislative and judicial instruments.
Download or read book Clothing Sacred Scriptures written by David Ganz and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-03 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: According to a longstanding interpretation, book religions are agents of textuality and logocentrism. This volume inverts the traditional perspective: its focus is on the strong dependency between scripture and aesthetics, holy books and material artworks, sacred texts and ritual performances. The contributions, written by a group of international specialists in Western, Byzantine, Islamic and Jewish Art, are committed to a comparative and transcultural approach. The authors reflect upon the different strategies of »clothing« sacred texts with precious materials and elaborate forms. They show how the pretypographic cultures of the Middle Ages used book ornaments as media for building a close relation between the divine words and their human audience. By exploring how art shapes the religious practice of books, and how the religious use of books shapes the evolution of artistic practices this book contributes to a new understanding of the deep nexus between sacred scripture and art.
Download or read book A Guide to the Preventive Conservation of Photograph Collections written by Bertrand Lavédrine and published by Getty Publications. This book was released on 2003 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: A resource for the photographic conservator, conservation scientist, curator, as well as professional collector, this volume synthesizes both the masses of research that has been completed to date and the international standards that have been established on the subject.
Download or read book The Chemistry of Silica written by Ralph K. Iler and published by Wiley-Interscience. This book was released on 1979-06-06 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactants and Interfacial Phenomena Milton J. Rosen Bridging the gap between purely theoretical aspects of surface chemistry and the purely empirical experience of the industrial technologist, this book applies theoretical surface chemistry to understanding the action of surfactants in modifying interfacial phenomena. It surveys the structural types of commercially available surfactants and discusses interfacial phenomena, the physicochemical principles underlying the action of surfactants in each phenomenon, and the effect of structural changes in the surfactants and environmental changes on their action. Tables of data on various interfacial properties of surfactants, compiled and calculated from the latest scientific literature, are included. 1978 304 pp. An Introduction to Clay Colloid Chemistry, 2nd Ed. H. van Olphen This book provides valuable guidance in research and design efforts by giving a clear understanding of principles and concepts of colloid chemistry as applied to clay systems. Updated and enlarged, this edition includes new information on surface characterization and adsorption mechanisms; recent results in the area of clay-organic interaction--the intercalation and intersalation of kaolinite minerals; and increased attention to the possible role of clays in biological evolution. 1977 318 pp. Physicochemical Processes for Water Quality Control Walter J. Weber, Jr. Focusing on physicochemical rather than biological processes, this book presents a comprehensive treatise on the treatment of municipal and industrial water and wastewater. All of the physicochemical processes important to municipal and industrial water and wastewater treatment--coagulation, filtration, membrane processes, chemical oxidation, and others--are included and each is covered thoroughly from principle through application. To maintain a high level of expertise, contributions have been incorporated from specialists actively involved in research or engineering applications in each area considered. 1972 640 pp.
Download or read book Electronic Composition in Printing written by Richard W. Lee and published by . This book was released on 1968 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Symposium on Electronic Composition in Printing was held at the Gaithersburg Laboratories of the National Bureau of Standards.The symposium was a state-of-the-art review of a rapidly advancing field of computer application with great potentialities for increased efficiency and savings in the Federal Government.(Author).
Download or read book Lake Pavin written by Télesphore Sime-Ngando and published by Springer. This book was released on 2018-07-07 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents the first multidisciplinary scientific work on a deep volcanic maar lake in comparison with other similar temperate lakes. The syntheses of the main characteristics of Lake Pavin are, for the first time, set in a firmer footing comparative approach, encompassing regional, national, European and international aquatic science contexts. It is a unique lake because of its permanently anoxic monimolimnion, and furthermore, because of its small surface area, its substantially low human influence, and by the fact that it does not have a river inflow. The book reflects the scientific research done on the general limnology, history, origin, volcanology and geological environment as well as on the geochemistry and biogeochemical cycles. Other chapters focus on the biology and microbial ecology whereas the sedimentology and paleolimnology are also given attention. This volume will be of special interest to researchers and advanced students, primarily in the fields of limnology, biogeochemistry, and aquatic ecology.
Download or read book Trust in Numbers written by Theodore M. Porter and published by Princeton University Press. This book was released on 2020-08-18 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: A foundational work on historical and social studies of quantification What accounts for the prestige of quantitative methods? The usual answer is that quantification is desirable in social investigation as a result of its successes in science. Trust in Numbers questions whether such success in the study of stars, molecules, or cells should be an attractive model for research on human societies, and examines why the natural sciences are highly quantitative in the first place. Theodore Porter argues that a better understanding of the attractions of quantification in business, government, and social research brings a fresh perspective to its role in psychology, physics, and medicine. Quantitative rigor is not inherent in science but arises from political and social pressures, and objectivity derives its impetus from cultural contexts. In a new preface, the author sheds light on the current infatuation with quantitative methods, particularly at the intersection of science and bureaucracy.
Download or read book The Palgrave Handbook of Critical Physical Geography written by Rebecca Lave and published by Springer. This book was released on 2018-04-04 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is recognition of the need to better integrate physical and human geography. It combines a collection of work and research within the new field of Critical Physical Geography, which gives critical attention to relations of social power with deep knowledge of a particular field of biophysical science. Critical Physical Geography research accords careful attention to biophysical landscapes and the power relations that have increasingly come to shape them, and to the politics of environmental science and the role of biophysical inquiry in promoting social and environmental justice. The Palgrave Handbook of Critical Physical Geography lays out the scope and guiding principles of Critical Physical Geography research. It presents a carefully selected set of empirical work, demonstrating the range and intellectual strength of existing integrative work in geography research. This handbook is the first of its kind to cover this emerging discipline and will be of significant interest to students and academics across the fields of geography, the environment and sustainability.
Download or read book Street Addressing and the Management of Cities written by Catherine Farvacque-Vitkovi? and published by World Bank Publications. This book was released on 2005 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been a dramatic demographic shift from rural areas to cities in sub-Saharan African countries over the last few decades. This continuing urbanisation trend has created new challenges for local governments in terms of managing urban services, since over half of the city streets in these countries have no names or addresses, and the problem is particularly acute in the poorest neighbourhoods. This publication examines the use of street addressing initiatives to address this problem, giving information on current and future applications, considering examples of use in many African countries, and setting out a methodological guide for implementing such initiatives.
Download or read book Adult Literacy in OECD Countries written by T. Scott Murray and published by . This book was released on 1998 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 1995, the Organisation for Economic Co-Operation and Development (OECD) and Statistics Canada jointly published the results of the first International Adult Literacy Survey (IALS). For this survey, representative samples of adults aged 16 to 65 were interviewed and tested in their homes in Canada, France, Germany, the Netherlands, Poland, Sweden, Switzerland, and the United States. This report describes how the survey was conducted in each country and presents all available evidence on the extent of bias in each country's data. Potential sources of bias, including sampling error, non-sampling error, and the cultural appropriateness and construct validity of the assessment instruments, are discussed. The chapters are; (1) "Introduction" (Irwin S. Kirsch and T. Scott Murray); (2) "Sample Design" (Nancy Darcovich); (3) "Survey Response and Weighting" (Nancy Darcovich); (4) "Non-Response Bias" (Nancy Darcovich, Marilyn Binkley, Jon Cohen, Mats Myrberg, and Stefan Persson); (5) "Data Collection and Processing" (Nancy Darcovich and T. Scott Murray); (6) "Incentives and the Motivation To Perform Well" (Stan Jones); (7) "The Measurement of Adult Literacy" (Irwin S. Kirsch, Ann Jungeblut, and Peter B. Mosenthal); (8) "Validity Generalization of the Assessment across Countries" (Don Rock); (9) "An Analysis of Items with Different Parameters across Countries" (Marilyn R. Binkley and Jean R. Pignal); (10) "Scaling and Scale Linking" (Kentaro Yamamoto); (11) "Proficiency Estimation" (Kentaro Yamamoto and Irwin S. Kirsch); (12) "Plausibility of Proficiency Estimates" (Richard Shillington); and (13) "Nested-Factor Models for the Swedish IALS Data" (Bo Palaszewski). Fourteen appendixes contain supplemental information, some survey questionnaires, and additional documentation for various chapters. (Contains 94 tables, 12 figures, and 74 references.) (SLD)
Download or read book Cosmeceuticals and Active Cosmetics written by Raja K Sivamani and published by CRC Press. This book was released on 2015-09-18 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cosmeceuticals and Active Cosmetics discusses the science of nearly two dozen cosmeceuticals used today. This third edition provides ample evidence on specific cosmeceutical substances, their classes of use, skin conditions for which they are used, and points of interest arising from other considerations, such as toxicology and manufacturing. The book discusses both cosmetic and therapeutic uses of cosmeceuticals for various conditions including rosacea, dry skin, alopecia, eczema, seborrheic dermatitis, purpura, and vitiligo. Active ingredients in the following products are discussed: caffeine, curcumin, green tea, Rhodiola rosea, milk thistle, and more. Also covered are topical peptides and proteins, amino acids and derivatives, antioxidants, vitamins E and C, niacinamide, botanical extracts, and biomarine actives. Providing ample scientific references, this book is an excellent guide to understanding the science behind the use of cosmeceuticals to treat a variety of dermatological conditions.
Download or read book Laser Dynamics written by Thomas Erneux and published by Cambridge University Press. This book was released on 2010-04-29 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridging the gap between laser physics and applied mathematics, this book offers a new perspective on laser dynamics. Combining fresh treatments of classic problems with up-to-date research, asymptotic techniques appropriate for nonlinear dynamical systems are shown to offer a powerful alternative to numerical simulations. The combined analytical and experimental description of dynamical instabilities provides a clear derivation of physical formulae and an evaluation of their significance. Starting with the observation of different time scales of an operating laser, the book develops approximation techniques to systematically explore their effects. Laser dynamical regimes are introduced at different levels of complexity, from standard turn-on experiments to stiff, chaotic, spontaneous or driven pulsations. Particular attention is given to quantitative comparisons between experiments and theory. The book broadens the range of analytical tools available to laser physicists and provides applied mathematicians with problems of practical interest, making it invaluable for graduate students and researchers.
Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.
Download or read book Heritage Sites of Astronomy and Archaeoastronomy in the Context of the UNESCO World Heritage Convention written by Clive L. N. Ruggles and published by . This book was released on 2017-11-30 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This joint venture between ICOMOS, the advisory body to UNESCO on cultural sites, and the International Astronomical Union is the second volume in an ongoing exploration of themes and issues relating to astronomical heritage in particular and to science and technology heritage in general. It examines a number of key questions relating to astronomical heritage sites and their potential recognition as World Heritage, attempting to identify what might constitute "outstanding universal value" in relation to astronomy. "Heritage Sites of Astronomy and Archaeoastronomy--Volume 2" represents the culmination of several years' work to address some of the most challenging issues raised in the first ICOMOS-IAU Thematic Study, published in 2010. These include the recognition and preservation of the value of dark skies at both cultural and natural sites and landscapes; balancing archaeoastronomical considerations in the context of broader archaeological and cultural values; the potential for serial nominations; and management issues such as preserving the integrity of astronomical sightlines through the landscape.Its case studies are developed in greater depth than those in volume 1, and generally structured as segments of draft nomination dossiers. They include seven-stone antas (prehistoric dolmens) in Portugal and Spain, the thirteen towers of Chankillo in Peru, the astronomical timing of irrigation in Oman, Pic du Midi de Bigorre Observatory in France, Baikonur Cosmodrome in Kazakhstan, and Aoraki-Mackenzie International Dark Sky Reserve in New Zealand. A case study on Stonehenge, already a World Heritage Site, focuses on preserving the integrity of the solstitial sightlines.As for the first ICOMOS-IAU Thematic Study, a international team of authors including historians, astronomers and heritage professionals is led by Professor Clive Ruggles for the IAU and Professor Michel Cotte for ICOMOS.
