Materials Literature
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Quitosana é um polissacarídeo usado em diversas aplicações biológicas, por exemplo, em liberação controlada de drogas, transfecção, aceleração da cicatrização de feridas e como agente bactericida, entre outras. Em todas essas aplicações, o polímero interage com tecidos e células. Entretanto, embora sua ação seja compr…
Neste trabalho foram avaliadas as atividades de catalisadores do tipo perovskita LaNi1-xCoxO3 frente à reação de reforma a vapor de etanol. Devido à baixa área superficial, característica de óxidos do tipo perovskita, esses foram suportados em SiO2, Al2O3 e ZrO2, a fim de verificar o efeito do suporte na atividade cat…
La thérapie cellulaire suscite de grands espoirs dans le domaine cardiovasculaire. Cependant les premières études humaines sont décevantes. Parmi les explications avancées, citons un mauvais choix de cellules, une méthode de délivrance inadéquate, une préparation des cellules et des tissus hôtes insuffisante ou une tr…
"Snapshots of cooperative atomic motions in the optical suppression of charge density waves" might not seem like an exciting title. But the paper, which appeared in last Thursday's Nature was my favorite of last week.
Les titano-zirconate de plomb PbZrTiO3 (PZT) de structure pérovskite sont largement utilisés dans l industrie de l électronique en raison de leurs excellentes propriétés diélectriques et électromécaniques. Le contexte actuel de l innovation technologique est la miniaturisation et l allègement des produits tout en en g…
Electrical conduction and relaxation phenomena in bismuth borate glasses in the composition 2Bi2O3-B2O3 (Bi4B2O9) were investigated. Dielectric studies carried out on these glasses revealed near constant loss (NCL) response in the 1 kHz to 1MHz frequency range at moderately high temperatures (300-450K) associated with…
Dans ce mémoire, après une présentation du contexte sur le couplage fluide/grain(chapitre 2) je détaille plus précisément les études effectuées sur le charriage dansun écoulement laminaire cisaillé (chapitre 3), la liquéfaction des sols sous vagues (chapitre4) ainsi que le glissement d’un sol granulaire immergé (chapi…
L’état métallurgique de l’austénite avant le dernier refroidissement (taille de grain, texture, écrouissage …) ne peux pas directement être caractérisée car elle se transforme lors du dernier refroidissement or elle influence remarquablement les propriétés d’emploi des aciers. Ce travail de thèse propose une méthode a…
De nos jours, la modélisation numérique constitue un outil indispensable pour le prototypage de convertisseurs électromagnétiques. Les matériaux magnétiques jouent un rôle essentiel dans la conversion de l’énergie, il est donc nécessaire de maîtriser leur comportement et leur représentation. L’objectif de ce travail s…
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Integrated circuits are built through a sequence of patterning steps. If the transistor shown in Fig. 6.1 is going to be contacted electrically so that it functions properly, the contact to the gate must physically connect to the gate and not short electrically to the source or drain. This requires that the pattern cr…
Measurement is required for developing lithographic processes and is fundamental to engineering and manufacturing control. The problem of accurate measurement is particularly significant for lithographers, where the extremely small features of state-of-the-art processes have pushed measurement capabilities to their li…
In addition to EUV lithography, a number of other alternatives to optical lithography have been or are being pursued. These alternative techniques have sometimes been called next-generation lithographies, and are frequently referred to by the acronym NGL. A number of alternatives to optical lithography have been conce…
Aos meus paisMax e Rosana. AgradecimentosGostaria de expressar o meu agradecimento a todos aqueles que de alguma forma contribuíram para a realização deste trabalho, em especial:• Aos meus pais Max e Rosana e à minha irmã Monique, sempre presentes em meu coração, pelo apoio incontestável, harmonia e superação que traz…
Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species.
REFORMS SOUGHT FOR AGROCHEMICAL DATA USDA’s failure to collect agricultural pesticide and fertilizer usage data from 2007 to 2009 because of budget constraints had a big impact on data users, a report from the Government Accountability Office (GAO) concludes. The report (GAO-11-37) finds that when USDA’s National Agri…
This specification establishes the requirements for biodegradable, enzyme based, precoating surface cleaners.
As k1 factors [Eq. (2.8)] fall below 0.8, a number of effects become observable that are not seen when k1 is larger. Processes with small values of k1 began to appear in the mid-1990s, and are quite common today, as seen from Table 8.1. Some of the effects seen in patterns generated with low-k1 processes are discussed…
This specification covers an ethylene propylene elastomer in the form of molded sheet and shapes, color coded purple per ARP1527.
Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species.