Download or read book APPROCHE NUMERIQUE ET EXPERIMENTALE DES VIBRATIONS AMORTIES DE TUBES REMPLIS DE MATERIAUX GRANULAIRES written by JEAN-MARC.. BOURINET and published by . This book was released on 1996 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE REMPLISSAGE A L'AIDE DE MATERIAUX GRANULAIRES CONSTITUE UN PROCEDE D'AMORTISSEMENT PASSIF PARTICULIEREMENT INTERESSANT POUR LES TUBES. LA PREMIERE PARTIE DU TRAVAIL PRESENTE ABORDE CE SUJET PAR UNE APPROCHE NUMERIQUE DES VIBRATIONS DE FLEXION D'UN TUBE A SECTION RECTANGULAIRE REMPLI DE MATERIAU GRANULAIRE. UNE METHODE DE TYPE RAIDEUR DYNAMIQUE A ETE EMPLOYEE EN SUPPOSANT UNE RESONANCE INTERNE EN 1/4 D'ONDE DANS LE MATERIAU ET EN ASSIMILANT LE TUBE A UNE POUTRE DE TIMOSHENKO. CETTE APPROCHE A CONDUIT A LA REALISATION SOUS MATLAB D'UN PROGRAMME GENERAL D'ETUDE DES VIBRATIONS DE TREILLIS DE POUTRES (AMORTIES OU NON). CE PROGRAMME MET EN UVRE DES ALGORITHMES SPECIFIQUES A LA METHODE UTILISEE ET REPOSE SUR L'EXPLOITATION DU CARACTERE CREUX DES MATRICES IMPLIQUEES. LA SECONDE PARTIE REGROUPE L'ENSEMBLE DES ESSAIS EXPERIMENTAUX EFFECTUES. L'HYPOTHESE DE RESONANCE INTERNE DU MATERIAU GRANULAIRE A TOUT D'ABORD FAIT L'OBJET D'UN ESSAI CONSISTANT EN UNE ETUDE DES VIBRATIONS VERTICALES HARMONIQUES D'UN MATERIAU GRANULAIRE CONFINE ENTRE 2 PAROIS. DES RESONANCES EN 1/4 D'ONDE SEMBLENT EFFECTIVEMENT SE PRODUIRE EN L'ABSENCE DE PRESSION DE CONFINEMENT. L'ANALYSE EST CEPENDANT DELICATE CAR LA VITESSE DES ONDES DANS LE MATERIAU DEPEND DE L'ORDRE DE LA RESONANCE ET DU NIVEAU D'ACCELERATION (PLAGE D'ETUDE: 0.5-10MS#-#2). L'ETUDE DE L'INFLUENCE DE LA CONTRAINTE ISOTROPE DANS LE MATERIAU A MONTRE L'APPARITION FRANCHE DE RESONANCES BILATERALES SUR LES COURBES DE MASSES APPARENTES AU NIVEAU DES PAROIS POUR UNE PRESSION CARACTERISTIQUE DE L'ORDRE DE 40MBAR. AU DELA DE CE SEUIL, LES FREQUENCES DE RESONANCE AUGMENTENT TRES RAPIDEMENT AVEC LA PRESSION DE CONFINEMENT. LE PROGRAMME REALISE A ETE APPLIQUE A UN TUBE REMPLI DE BILLES DE VERRE QUI A FAIT L'OBJET DE LA SECONDE ETUDE EXPERIMENTALE. LES RESULTATS OBTENUS PENDANT L'ESSAI VIBRATOIRE DU MATERIAU GRANULAIRE ONT ORIENTE LE CHOIX DES PARAMETRES DU MODELE. LES FREQUENCES PROPRES ET AMORTISSEMENTS MODAUX EXPERIMENTAUX ONT ETE COMPARES A CEUX CALCULES

Download or read book Properties of UO2 written by J. Belle and published by . This book was released on 1957 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.