Reproduction de : Thèse d'exercice : Pharmacie : Nantes : 2009. / Bibliogr.

Thèse de doctorat : mécanique et matériaux : Ecole centrale de Paris : 2009. / Titre provenant de l'écran-titre. Bibliogr. 161 réf.

In mineral deposits the application of the Re-Os system has evolved on two fronts; as a geochronometer in molybdenite, and as a tracer of the source of metals by direct determination of the source of Os contained in the ore minerals. Results obtained from a wide variety and types of mineral deposits indicate that ore minerals in most deposits contain a high initial osmium composition, compared to the mantle value at the time of ore formation. The Re-Os data presented here for the Platreef, South Africa, adds to the growing notion that the crust plays a fundamental role in the formation of mineral deposits and as a source of ore minerals. Additional data from the Zambian Copperbelt illustrate the utility of the Re-Os system as a geochronometer of sulfide mineralization. Two isochron ages of ca. 825 Ma and 575 Ma are consistent with a long-lived period of multistage mineralization linked to basin evolution and support a model where brines play a fundamental role in the formation of sediment-hosted stratiform deposits.Numerous new Re-Os molybdenite ages have recently been reported; however, the behavior of Re and Os in molybdenites is still poorly understood and controversy remains regarding the possible disturbance of the Re-Os isotopic system. Previous studies indicate that the Re-Os system in molybdenites, and in other sulfides, can experience disturbance by Re and Os loss or Re gain (both examples of open system behavior), and that the analysis of these altered samples yields equivocal ages. Through replicate analyses of samples and/or comparison with other robust dating techniques, such as the U-Pb geochronometer, it is possible to differentiate between Re-Os molybdenite ages reflecting a mineralization age or a post depositional event. Once the reliability of the Re-Os molybdenite analyses is proven, it is possible to constrain the timing of mineralization and the identification of multiple molybdenite mineralization events, information that is relevant in assessing the longevity of porphyry systems.The examples presented in this work support the use of the Re-Os isotopic system as an important geochemical tool in the understanding of mineral deposits.

No description available.

One challenge associated with developing location-based social applications for iOS devices is building a framework on top of Apple’s Core Bluetooth Framework to drive user discovery. Many applications on Apple’s App Store use Bluetooth to enable location-based user discovery. These Social Location-Based Frameworks are private and often are lacking. An ideal Social Location-Based Bluetooth Framework would be public, would be responsive while the application is minimized, have a light battery footprint, and securely transfer the necessary data to enable social interaction. Samantha, a Social Location-Based Framework, meets all of these characteristics. In a Test Application, Samantha took no more than 5 seconds to start up and discover all nearby users. The average discovery time was 3.5 seconds. In addition the battery draw, measured using Apple’s Battery Monitoring Instrument, during testing never exceed 1/20. This means an application running Samantha in the background for a 12-hour period would not significantly drain the battery. In terms of security, Samantha transfers a Unique User Identifier (UUID) across Bluetooth than contains no sensitive information. This UUID, a string of random characters, contains no personal information and it is only useful because it allows specific identification of a nearby user in a database holding additional information. This two-step process ensures that confidential information is never exposed. An example application, Ripple, uses Samantha to create a location-based social application and highlights the framework’s intended use.

Ever had an experience of forgetting to do something very important on a place you just past?. Remembering, on arrival at your destination afterward, requires an action to return to the task location. This can be unproductive and perhaps result to frustration. The purpose of this thesis is to develop a “Location Task-To-Do manager” an android mobile application that will efficiently organizes task-to-do list and remind an individual to perform a task at a pre-defined location through notification and alert messages. The methods used includes,  investigation of pre-existing systems, requirement elicitation survey technique, three-tier architecture design pattern, iterative development life-cycle model, acceptance test plan and a sets of other technology such as  Java SDK, Android APIs, TCP/IP protocol, object oriented programing techniques and MySql relational database. The result showed that, installed “Location Task-To-Do manager” application on individual mobile devices/smartphones were capable of creating task, adding task, editing task, deleting task, sharing task and setting task location through its user friendly graphical interfaces. Users are able to receive notification to perform a task within a minimum distance of 1km to the exact task location.

Syftet med uppsatsen var att undersö̈ka likheter och skillnader i SVT och Viasats respektive huvudkanals bevakning av vinter-OS 2010 i Vancouver och 2014 i Sotji, då̊ OS i Sotji var det fö̈rsta som sä̈ndes i kommersiell tv i Sverige. Frågestä̈llningarna utgick från vilka idrotter, sä̈ndningstyper och kö̈n de två kanalerna prioriterade, samt vilka orsaker som kan finnas till eventuella likheter och skillnader. Studien baserades på två metoder: En kvantitativ innehållsanalys av båda kanalernas sändningar, sammanlagt 387 timmar tv-material, och kompletterande kvalitativa intervjuer med representanter för respektive kanal. Resultatet av den kvantitativa innehållsanalysen visade att båda kanalerna är lika sett till vilka sporter de prioriterade, och sett till kö̈nsrepresentationen. Den stö̈rsta skillnaden fanns i sändningstyper, dä̈r TV3 lade mer tid på studiosändningar än SVT, som i sin tur lade mer tid på eftersändningar och sammandrag. De kvalitativa intervjuerna visade att båda kanalerna resonerade på ett liknande sätt kring sina sändningar, vilket förstärker kanalernas likhet. Den teoretiska ramen för uppsatsen innefattade teorier om kommersialisering, nyhetsvärdering, maskulin hegemoni och sportjournalistiken som institution. Samtliga teorier har i olika grad använts för att förklara olika resultat, men störst vikt har lagts vid Peter Dahléns teori om sportjournalistiken som institution. Den viktigaste slutsatsen från resultatet var att de två kanalerna inte skiljde sig särskilt mycket åt i sina respektive bevakningar av OS. En förklaring till det kan vara att sportjournalistiken som institution är kommersiell i sig, och på detta sätt skiljer sig kraftigt från nyhetsjournalistiken.

Thèse (M.Sc.)--Université Laval, 2007. / Bibliogr.: f. 71-89. Publié aussi en version électronique dans la Collection Mémoires et thèses électroniques.

Thèse (M.Sc.)--Université Laval, 2008. / Bibliogr.: f. 109-121. Publié aussi en version électronique dans la Collection Mémoires et thèses électroniques.

Thesis--Coimbra. / Includes bibliographical references.