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Etude Dynamique Theorique Et Experimentale Des Essais De Frottement Pion Disque
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Book Synopsis Etude dynamique, théorique et expérimentale des essais de frottement pion-disque by : ACHOUR.. LIMOUNI
Download or read book Etude dynamique, théorique et expérimentale des essais de frottement pion-disque written by ACHOUR.. LIMOUNI and published by . This book was released on 1998 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES ESSAIS DE FROTTEMENT ONT ETE EFFECTUES SUR UN TRIBOMETRE PION SUR DISQUE. POUR OBTENIR UNE VARIATION IMPORTANTE DU MODULE D'YOUNG, UNE VARIETE IMPORTANTE DE MATERIAUX A ETE TESTEE PLUSIEURS MOYENS ONT ETE UTILISES POUR ANALYSER LES SURFACES EN FROTTEMENT : LE PROFILOMETRE LASER, LE MICROSCOPE INTERFEROMETRIQUE, LA CAMERA VIDEO ET LE MICROSCOPE ELECTRONIQUE A BALAYAGE. UNE ANALYSE MODULE DE LA MACHINE DE FROTTEMENT A PERMIS DE VALIDER LES APPROCHES THEORIQUES PAR ELEMENTS FINIS ET PAR PARAMETRES DISCRETS. PENDANT L'ESSAI DE FROTTEMENT, LES VIBRATIONS ONT ETE PRELEVEES A L'AIDE D'UN CAPTEUR D'EFFORT TRIDIRECTIONNEL ET DEUX CAPTEURS D'ACCELERATION. L'ANALYSE SPECTRALE DES SIGNAUX DES EFFORTS ET DES ACCELERATIONS MONTRE QUE LE FROTTEUR VIBRE A LA MEME FREQUENCE DANS LES DIRECTIONS NORMALE ET TANGENTIELLE. L'ALOURDISSEMENT DU SUPPORT DU FROTTEUR CONDUIT A UN CHANGEMENT DU REGIME VIBRATOIRE ET PRODUIT UN ACCROISSEMENT DE L'USURE ET DU COEFFICIENT DE FROTTEMENT. UNE EVALUATION DU MODULE D'ELASTICITE PRODUIT UNE HAUSSE DE LA FREQUENCE DE LA VIBRATION ET UNE ELEVATION DU COEFFICIENT DE FROTTEMENT. POUR UN FROTTEUR HEMISPHERIQUE L'AUGMENTATION DU RAYON DU FROTTEUR CONDUIT A UNE HAUSSE DE LA FREQUENCE ET A UNE ELEVATION DU COEFFICIENT DE FROTTEMENT ET DE L'USURE DU FROTTEUR. LA VIBRATION EST PRODUITE PAR LA PRESENCE DES PARTICULES D'USURE A L'INTERFACE. LA DEFINITION DE LA PARTICULE CONDUIT AU MOUVEMENT DU FROTTEUR, ET PROVOQUE DES EMPREINTES SUR LA SURFACE DU DISQUE. LE MODELE ANALYTIQUE A PERMIS DE VALIDER LES RESULTATS DE MESURE DE METTRE EN EVIDENCE LES HARMONIQUES INDUITES PAR LE FROTTEMENT.
Book Synopsis Résultats les plus marquants de l'étude théorique et expérimentale sur le frottement médiat ... by : Nikolaĭ Pavlovich Petrov
Download or read book Résultats les plus marquants de l'étude théorique et expérimentale sur le frottement médiat ... written by Nikolaĭ Pavlovich Petrov and published by . This book was released on 1889 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Unesco. International Scientific Committee for the Drafting of a General History of Africa Publisher :Univ of California Press ISBN 13 :9780520067035 Total Pages :1076 pages Book Rating :4.0/5 (67 download)
Book Synopsis Africa Since 1935 by : Unesco. International Scientific Committee for the Drafting of a General History of Africa
Download or read book Africa Since 1935 written by Unesco. International Scientific Committee for the Drafting of a General History of Africa and published by Univ of California Press. This book was released on 1999 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hardcover edition of volume 8 was published in 1994. This paperback edition is the eighth and final volume to be published in the UNESCO General History of Africa. Volume 8 examines the period from 1935 to the present, and details the role of African states in the Second World War and the rise of postwar Africa. This is one of the most important books in the entire series, and as such, it is an unabridged paperback.
Book Synopsis Préhistoire africaine by : Colette Roubet
Download or read book Préhistoire africaine written by Colette Roubet and published by . This book was released on 1981 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Social Media Reader by : Michael Mandiberg
Download or read book The Social Media Reader written by Michael Mandiberg and published by NYU Press. This book was released on 2012-03 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first collection to address the collective transformation happening in response to the rise of social media With the rise of web 2.0 and social media platforms taking over vast tracts of territory on the internet, the media landscape has shifted drastically in the past 20 years, transforming previously stable relationships between media creators and consumers. The Social Media Reader is the first collection to address the collective transformation with pieces on social media, peer production, copyright politics, and other aspects of contemporary internet culture from all the major thinkers in the field. Culling a broad range and incorporating different styles of scholarship from foundational pieces and published articles to unpublished pieces, journalistic accounts, personal narratives from blogs, and whitepapers, The Social Media Reader promises to be an essential text, with contributions from Lawrence Lessig, Henry Jenkins, Clay Shirky, Tim O'Reilly, Chris Anderson, Yochai Benkler, danah boyd, and Fred von Loehmann, to name a few. It covers a wide-ranging topical terrain, much like the internet itself, with particular emphasis on collaboration and sharing, the politics of social media and social networking, Free Culture and copyright politics, and labor and ownership. Theorizing new models of collaboration, identity, commerce, copyright, ownership, and labor, these essays outline possibilities for cultural democracy that arise when the formerly passive audience becomes active cultural creators, while warning of the dystopian potential of new forms of surveillance and control.
Book Synopsis Hacking Capitalism by : Johan Söderberg
Download or read book Hacking Capitalism written by Johan Söderberg and published by Routledge. This book was released on 2015-12-22 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Free and Open Source Software (FOSS) movement demonstrates how labour can self-organise production, and, as is shown by the free operating system GNU/Linux, even compete with some of the worlds largest firms. The book examines the hopes of such thinkers as Friedrich Schiller, Karl Marx, Herbert Marcuse and Antonio Negri, in the light of the recent achievements of the hacker movement. This book is the first to examine a different kind of political activism that consists in the development of technology from below.
Download or read book Hacker States written by Luca Follis and published by MIT Press. This book was released on 2020-04-07 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: How hackers and hacking moved from being a target of the state to a key resource for the expression and deployment of state power. In this book, Luca Follis and Adam Fish examine the entanglements between hackers and the state, showing how hackers and hacking moved from being a target of state law enforcement to a key resource for the expression and deployment of state power. Follis and Fish trace government efforts to control the power of the internet; the prosecution of hackers and leakers (including such well-known cases as Chelsea Manning, Edward Snowden, and Anonymous); and the eventual rehabilitation of hackers who undertake “ethical hacking” for the state. Analyzing the evolution of the state's relationship to hacking, they argue that state-sponsored hacking ultimately corrodes the rule of law and offers unchecked advantage to those in power, clearing the way for more authoritarian rule. Follis and Fish draw on a range of methodologies and disciplines, including ethnographic and digital archive methods from fields as diverse as anthropology, STS, and criminology. They propose a novel “boundary work” theoretical framework to articulate the relational approach to understanding state and hacker interactions advanced by the book. In the context of Russian bot armies, the rise of fake news, and algorithmic opacity, they describe the political impact of leaks and hacks, hacker partnerships with journalists in pursuit of transparency and accountability, the increasingly prominent use of extradition in hacking-related cases, and the privatization of hackers for hire.
Download or read book Hacking Europe written by Gerard Alberts and published by Springer. This book was released on 2014-09-03 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hacking Europe traces the user practices of chopping games in Warsaw, hacking software in Athens, creating chaos in Hamburg, producing demos in Turku, and partying with computing in Zagreb and Amsterdam. Focusing on several European countries at the end of the Cold War, the book shows the digital development was not an exclusively American affair. Local hacker communities appropriated the computer and forged new cultures around it like the hackers in Yugoslavia, Poland and Finland, who showed off their tricks and creating distinct “demoscenes.” Together the essays reflect a diverse palette of cultural practices by which European users domesticated computer technologies. Each chapter explores the mediating actors instrumental in introducing and spreading the cultures of computing around Europe. More generally, the “ludological” element--the role of mischief, humor, and play--discussed here as crucial for analysis of hacker culture, opens new vistas for the study of the history of technology.
Book Synopsis The Success of Open Source by : Steve WEBER
Download or read book The Success of Open Source written by Steve WEBER and published by Harvard University Press. This book was released on 2009-06-30 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Much of the innovative programming that powers the Internet, creates operating systems, and produces software is the result of "open source" code, that is, code that is freely distributed--as opposed to being kept secret--by those who write it. Leaving source code open has generated some of the most sophisticated developments in computer technology, including, most notably, Linux and Apache, which pose a significant challenge to Microsoft in the marketplace. As Steven Weber discusses, open source's success in a highly competitive industry has subverted many assumptions about how businesses are run, and how intellectual products are created and protected. Traditionally, intellectual property law has allowed companies to control knowledge and has guarded the rights of the innovator, at the expense of industry-wide cooperation. In turn, engineers of new software code are richly rewarded; but, as Weber shows, in spite of the conventional wisdom that innovation is driven by the promise of individual and corporate wealth, ensuring the free distribution of code among computer programmers can empower a more effective process for building intellectual products. In the case of Open Source, independent programmers--sometimes hundreds or thousands of them--make unpaid contributions to software that develops organically, through trial and error. Weber argues that the success of open source is not a freakish exception to economic principles. The open source community is guided by standards, rules, decisionmaking procedures, and sanctioning mechanisms. Weber explains the political and economic dynamics of this mysterious but important market development. Table of Contents: Preface 1. Property and the Problem of Software 2. The Early History of Open Source 3. What Is Open Source and How Does It Work? 4. A Maturing Model of Production 5. Explaining Open Source: Microfoundations 6. Explaining Open Source: Macro-Organization 7. Business Models and the Law 8. The Code That Changed the World? Notes Index Reviews of this book: In the world of open-source software, true believers can be a fervent bunch. Linux, for example, may act as a credo as well as an operating system. But there is much substance beyond zealotry, says Steven Weber, the author of The Success of Open Source...An open-source operating system offers its source code up to be played with, extended, debugged, and otherwise tweaked in an orgy of user collaboration. The author traces the roots of that ethos and process in the early years of computers...He also analyzes the interface between open source and the worlds of business and law, as well as wider issues in the clash between hierarchical structures and networks, a subject with relevance beyond the software industry to the war on terrorism. --Nina C. Ayoub, Chronicle of Higher Education Reviews of this book: A valuable new account of the [open-source software] movement. --Edward Rothstein, New York Times We can blindly continue to develop, reward, protect, and organize around knowledge assets on the comfortable assumption that their traditional property rights remain inviolate. Or we can listen to Steven Weber and begin to make our peace with the uncomfortable fact that the very foundations of our familiar "knowledge as property" world have irrevocably shifted. --Alan Kantrow, Chief Knowledge Officer, Monitor Group Ever since the invention of agriculture, human beings have had only three social-engineering tools for organizing any large-scale division of labor: markets (and the carrots of material benefits they offer), hierarchies (and the sticks of punishment they impose), and charisma (and the promises of rapture they offer). Now there is the possibility of a fourth mode of effective social organization--one that we perhaps see in embryo in the creation and maintenance of open-source software. My Berkeley colleague Steven Weber's book is a brilliant exploration of this fascinating topic. --J. Bradford DeLong, Department of Economics, University of California at Berkeley Steven Weber has produced a significant, insightful book that is both smart and important. The most impressive achievement of this volume is that Weber has spent the time to learn and think about the technological, sociological, business, and legal perspectives related to open source. The Success of Open Source is timely and more thought provoking than almost anything I've come across in the past several years. It deserves careful reading by a wide audience. --Jonathan Aronson, Annenberg School for Communication, University of Southern California
Book Synopsis How Users Matter by : Nelly Oudshoorn
Download or read book How Users Matter written by Nelly Oudshoorn and published by MIT Press. This book was released on 2005-08-12 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Users have become an integral part of technology studies. The essays in this volume look at the creative capacity of users to shape technology in all phases, from design to implementation. Using a variety of theoretical approaches, including a feminist focus on users and use (in place of the traditional emphasis on men and machines), concepts from semiotics, and the cultural studies view of consumption as a cultural activity, these essays examine what users do with technology and, in turn, what technology does to users. The contributors consider how users consume, modify, domesticate, design, reconfigure, and resist technological development—and how users are defined and transformed by technology. The essays in part I show that resistance to and non-use of a technology can be a crucial factor in the eventual modification and improvement of that technology; examples considered include the introduction of the telephone into rural America and the influence of non-users of the Internet. The essays in part II look at advocacy groups and the many kinds of users they represent, particularly in the context of health care and clinical testing. The essays in part III examine the role of users in different phases of the design, testing, and selling of technology. Included here is an enlightening account of one company's design process for men's and women's shavers, which resulted in a "Ladyshave" for users assumed to be technophobes. Taken together, the essays in How Users Matter show that any understanding of users must take into consideration the multiplicity of roles they play—and that the conventional distinction between users and producers is largely artificial.
Book Synopsis Coding Freedom by : E. Gabriella Coleman
Download or read book Coding Freedom written by E. Gabriella Coleman and published by Princeton University Press. This book was released on 2013 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Who are computer hackers? What is free software? And what does the emergence of a community dedicated to the production of free and open source software--and to hacking as a technical, aesthetic, and moral project--reveal about the values of contemporary liberalism? Exploring the rise and political significance of the free and open source software (F/OSS) movement in the United States and Europe, Coding Freedom details the ethics behind hackers' devotion to F/OSS, the social codes that guide its production, and the political struggles through which hackers question the scope and direction of copyright and patent law. In telling the story of the F/OSS movement, the book unfolds a broader narrative involving computing, the politics of access, and intellectual property. E. Gabriella Coleman tracks the ways in which hackers collaborate and examines passionate manifestos, hacker humor, free software project governance, and festive hacker conferences. Looking at the ways that hackers sustain their productive freedom, Coleman shows that these activists, driven by a commitment to their work, reformulate key ideals including free speech, transparency, and meritocracy, and refuse restrictive intellectual protections. Coleman demonstrates how hacking, so often marginalized or misunderstood, sheds light on the continuing relevance of liberalism in online collaboration.
Book Synopsis Digital Keywords by : Benjamin Peters
Download or read book Digital Keywords written by Benjamin Peters and published by Princeton University Press. This book was released on 2016-06-07 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: How the digital revolution has shaped our language In the age of search, keywords increasingly organize research, teaching, and even thought itself. Inspired by Raymond Williams's 1976 classic Keywords, the timely collection Digital Keywords gathers pointed, provocative short essays on more than two dozen keywords by leading and rising digital media scholars from the areas of anthropology, digital humanities, history, political science, philosophy, religious studies, rhetoric, science and technology studies, and sociology. Digital Keywords examines and critiques the rich lexicon animating the emerging field of digital studies. This collection broadens our understanding of how we talk about the modern world, particularly of the vocabulary at work in information technologies. Contributors scrutinize each keyword independently: for example, the recent pairing of digital and analog is separated, while classic terms such as community, culture, event, memory, and democracy are treated in light of their historical and intellectual importance. Metaphors of the cloud in cloud computing and the mirror in data mirroring combine with recent and radical uses of terms such as information, sharing, gaming, algorithm, and internet to reveal previously hidden insights into contemporary life. Bookended by a critical introduction and a list of over two hundred other digital keywords, these essays provide concise, compelling arguments about our current mediated condition. Digital Keywords delves into what language does in today's information revolution and why it matters.
Download or read book Hacked written by Kevin F. Steinmetz and published by NYU Press. This book was released on 2016-11-29 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inside the life of a hacker and cybercrime culture. Public discourse, from pop culture to political rhetoric, portrays hackers as deceptive, digital villains. But what do we actually know about them? In Hacked, Kevin F. Steinmetz explores what it means to be a hacker and the nuances of hacker culture. Through extensive interviews with hackers, observations of hacker communities, and analyses of hacker cultural products, Steinmetz demystifies the figure of the hacker and situates the practice of hacking within the larger political and economic structures of capitalism, crime, and control.This captivating book challenges many of the common narratives of hackers, suggesting that not all forms of hacking are criminal and, contrary to popular opinion, the broader hacker community actually plays a vital role in our information economy. Hacked thus explores how governments, corporations, and other institutions attempt to manage hacker culture through the creation of ideologies and laws that protect powerful economic interests. Not content to simply critique the situation, Steinmetz ends his work by providing actionable policy recommendations that aim to redirect the focus from the individual to corporations, governments, and broader social issues. A compelling study, Hacked helps us understand not just the figure of the hacker, but also digital crime and social control in our high-tech society.
Book Synopsis Exploding the Phone by : Phil Lapsley
Download or read book Exploding the Phone written by Phil Lapsley and published by Open Road + Grove/Atlantic. This book was released on 2013-02-05 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: “A rollicking history of the telephone system and the hackers who exploited its flaws.” —Kirkus Reviews, starred review Before smartphones, back even before the Internet and personal computers, a misfit group of technophiles, blind teenagers, hippies, and outlaws figured out how to hack the world’s largest machine: the telephone system. Starting with Alexander Graham Bell’s revolutionary “harmonic telegraph,” by the middle of the twentieth century the phone system had grown into something extraordinary, a web of cutting-edge switching machines and human operators that linked together millions of people like never before. But the network had a billion-dollar flaw, and once people discovered it, things would never be the same. Exploding the Phone tells this story in full for the first time. It traces the birth of long-distance communication and the telephone, the rise of AT&T’s monopoly, the creation of the sophisticated machines that made it all work, and the discovery of Ma Bell’s Achilles’ heel. Phil Lapsley expertly weaves together the clandestine underground of “phone phreaks” who turned the network into their electronic playground, the mobsters who exploited its flaws to avoid the feds, the explosion of telephone hacking in the counterculture, and the war between the phreaks, the phone company, and the FBI. The product of extensive original research, Exploding the Phone is a groundbreaking, captivating book that “does for the phone phreaks what Steven Levy’s Hackers did for computer pioneers” (Boing Boing). “An authoritative, jaunty and enjoyable account of their sometimes comical, sometimes impressive and sometimes disquieting misdeeds.” —The Wall Street Journal “Brilliantly researched.” —The Atlantic “A fantastically fun romp through the world of early phone hackers, who sought free long distance, and in the end helped launch the computer era.” —The Seattle Times
Download or read book Cyber Mercenaries written by Tim Maurer and published by Cambridge University Press. This book was released on 2018-01-18 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cyber Mercenaries explores the secretive relationships between states and hackers. As cyberspace has emerged as the new frontier for geopolitics, states have become entrepreneurial in their sponsorship, deployment, and exploitation of hackers as proxies to project power. Such modern-day mercenaries and privateers can impose significant harm undermining global security, stability, and human rights. These state-hacker relationships therefore raise important questions about the control, authority, and use of offensive cyber capabilities. While different countries pursue different models for their proxy relationships, they face the common challenge of balancing the benefits of these relationships with their costs and the potential risks of escalation. This book examines case studies in the United States, Iran, Syria, Russia, and China for the purpose of establishing a framework to better understand and manage the impact and risks of cyber proxies on global politics.
Download or read book The Watchman written by Jonathan Littman and published by St. Martin's Press. This book was released on 1997-03-31 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a first-rate detective story--and all true. It's the story of a seemingly invincible electronic thief, con man, and stalker--and the people who tracked him down. Jonathan Littman brings his readers straight into the world of cyberpunk crime as he shows the origins, development, and climax of the wildest and most audacious known crime spree in cyberspace. Hundreds of hours of interviews allow Littman to tell much of the story through the eyes of those who lived it, and his own edgy style and excellent pacing make for a thriller that's hard to put down.
Book Synopsis The Routledge Companion to Media and Activism by : Graham Meikle
Download or read book The Routledge Companion to Media and Activism written by Graham Meikle and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Routledge Collection to Media and Activism is a wide-ranging collection of original essays by leading contributors from around the world.
