A CMOS/SOI single-input PWM discriminator for low-voltage body-implanted applications

A CMOS/SOI circuit to decode Pulse-Width Modulation (PWM) signals is presented as part of a body-implanted neurostimulator for visual prosthesis. Since encoded data is the sole input to the circuit, the decoding technique is based on a novel double-integration concept and does not require low-pass filtering. Non-overlapping control phases are internally derived from the incoming pulses and a fast-settling comparator ensures good discrimination accuracy in the megahertz range. The circuit was integrated on a 2 mum single-metal thin-film CMOS/SOI fabrication process and has an effective area of 2 mm(2). Measured resolution of encoding parameter a is better than 10% at 6 MHz and V-DD = 3.3 V. Idle-mode consumption is 340 LW. Pulses of frequencies up to 15 MHz and alpha = 10% can be discriminated for 2.3 V less than or equal to V-DD less than or equal to 3.3 V. Such an excellent immunity to V-DD deviations meets a design specification with respect to inherent coupling losses on transmitting data and power by means of a transcutaneous link.

Minas e a aclamação de D. João VI no limiar da formação do Estado-Nação brasileiro: memórias, conflitos e sedições

Dans cet article on examinera les cérémonies d'acclamation du roi D. João VI qui ont eu lieu à Tejuco en 1818. Le décodage de la riche variété d'images esthétiques présente dans ces célébrations peut être une stratégie privilégiée pour comprendre la création, à ce moment-là, des mythes qui donneraient soutien et orientation au projet d'affirmation du prestige politique du roi et à la consolidation de sa domination sur la région et sur tout le territoire brésilien. on analysera en particulier le conflit de mémoires entre la signification symbolique de la célébration et la révolte du peuple de Minas contre l'exploitation coloniale portugaise qui avait éclaté dans la région environ trois décennies avant.

Climate and acute/subacute paracoccidioidomycosis in a hyper-endemic area in Brazil

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Comment on Effect of spin-orbit interaction on the plasma excitations in a quantum wire

We comment on the recent results [Phys. Rev. B 70, 235314 (2004)] showing the dispersion relations of single-particle and collective excitations in quantum wires in the presence of the Rashba spin-orbit interaction (SOI). We claim that those calculations performed in the absence of SOI, and used as a strong reference to the interacting case, are unlikely to be correct. We show the correct omega-q plane of the system in the absence of Rashba SOI.

Desafios e missão do intelectual público

Dans cet article qui se propose de rendre hommage à Carlos Estevam Martins, chercheur en sciences sociales, on examine le rôle de l'intellectuel dans le monde actuel. on part du présupposé qu'on assiste à une métamorphose, due à la forte tendance à l'hyperspécialisation, qui éloigne les intellectuels du vrai débat sur les idées et l'intérêt civique. Paradoxalement, cette même métamorphose exige la présence active de l'intellectuel en tant que personnage apte à produire du sens et des synthèses, pouvant ainsi aider la communauté politique à trouver des formes plus évoluées de conscience de soi.

No limiar do mundo visível: a noção de esquema corporal nos cursos de Merleau-Ponty na Sorbonne

Suivant notre intention générale qui est d'étudier longitudinalement l'utilisation que Merleau-Ponty fait de la notion de schéma corporel dans sa philosophie, nous nous consacrons dans cet article à ses cours à la Sorbonne. Ces cours font partie d'une période intermédiaire de son oeuvre. Le philosophe y amorce des discussions concernant la corporeité à partir de la psychologie de l'enfant et de la psychanalyse, en abordant le problème de l'intersubjectivité et la théorie du schéma corporel. Merleau-Ponty comprend que l'acquisition d'un schéma corporel unitaire, total, implique une décentralisation de soi, de façon que le corps propre, le corps d'autrui et le monde puissent s'entrelacer dans un tissu relationnel qui implique inextricablement visibilité et épaisseur intra-corporel. Nous considérons que dans ces études Merleau-Ponty effectue un grand pas vers la notion de chair telle qu'on la trouve dans ses textes plus tardifs.

O silêncio das musas: Épico, ciência e poesia em Haroldo de Campos

The epic and science seem to have been the most important concerns of the Brazilian author Haroldo de Campos (1929-2003) in his last twenty years of life. The books Finismundo: a última viagem and A máquina do mundo repensada are two significant works in his aesthetical journey. This paper presents some strategies for reading both books, in which the relationship between those themes is emphasized. As a starting point, it is believed that the analogy between science and the epic does not represent a paradigm of reading on which the poetry of Harold de Campos intends to base itself, but a way of thinking about the political and literary concerns that constitute its own situation. The creation of a poetics of adventure as an alternative to the end of utopia and the affirmation of a principle of indeterminacy as a way to oppose the interpretations immediately available in the present constitute two of the main interests found in this mode of reading.

Disponibilidade de fósforo para a soja cultivada sobre braquiária

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação dos impactos econômicos do potencial de desenvolvimento da mitilicultura no município de Ubatuba-SP

Pós-graduação em Aquicultura - FCAV

Companhia de dança Afro Bataka: ações artísticas, socioculturais e políticas

Pós-graduação em Artes - IA

Acesso ao direito e a democratização da justiça na assistência jurídica integral e gratuita contemporânea

Pós-graduação em Ciências Sociais - FFC

O papel dos municípios na segurança pública: relações entre CONSEG e administração municipal (1985-2008)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Os posseiros e a luta pela terra na região do Bico do Papagaio 1964-1985: modernização e tradição

Pós-graduação em Ciências Sociais - FFC

A propriedade intelectual no mundo contemporâneo no contexto geral das relações de propriedade

Pós-graduação em Ciências Sociais - FFC

União Européia: a luta pelo reconhecimento identitário e a questão da cidadania supranacional

Pós-graduação em Ciências Sociais - FFC