Encontrados 17 documentos, a visualizar página 1 de 2

Sistema de Localização com Ultra-sons

In this paper, we present a robot location systemusing ultrasonic beacons. The robot-beacon distance is computed from the measured time-of-flight of the sound waves.In order to distinguish the different beacons we used BinaryPhase Shift Keying (BPSK) modulation with Gold sequencesas the modulated signal. The robot uses Differencial BPSK(DBPSK) demodulation and a match-filter to detect the emittedpulses. The pos...

Developing an identification system for museums using ultrasound technology

This work presents the design of a low cost electronic system that uses PSK modulated ultrasound signals to perform location and identification in indoor environments. The target application is the identification of works of art in museums. In this paper we describe the design, implementation and testing of the system prototype. This system (composed by three emitters and one receiver) can correctly identify ea...

Modelação e controlo de um sistema de aquecimento solar térmico

A rápida escassez de energia fóssil acarreta consigo o aumento incontornável do custo da sua utilização. Associada tem-se a sensibilização ambiental que incentiva a utilização de energias renováveis em detrimento de energias fósseis. Como resposta, surgem incentivos para a utilização de energias renováveis, através de apoios por parte dos governos, como é o caso da energia solar. Em uso doméstico, uma fatia con...

Chemical reactivity of paraquat with the previously validated antidote, sodium ...

Reactivity of paraquat with sodium salicylate: Formation of stable complexes

Sodium salicylate (NaSAL) has been shown to be a promising antidote for the treatment of paraquat (PQ) poisonings. The modulation of the pro-oxidant and pro-inflammatory pathways, as well as the antithrombogenic properties of NaSAL are probably essential features for the healing effects provided by this drug. Nevertheless, a possible direct chemical reactivity between PQ and NaSAL is also a putative pathway to ...

Síncope em pacientes com extra-sístoles de via de saída de ventrículo direito e...

OBJETIVO: Estudar a prevalência de síncope neurocardiogênica em pacientes com síncope inexplicada e extra-sístoles ventriculares (EV), com morfologia de via de saída de ventrículo direito (VSVD) sem cardiopatia estrutural aparente. MÉTODOS: Noventa pacientes (66 mulheres, idade média de 40,2 ± 16,95 anos) com EV monomórficas com origem na VSVD foram avaliados prospectivamente. Cinqüenta e quatro paciente...

Experimental and numerical evaluation of bond properties between reinforcement ...

A study of the bond behaviour between steel reinforcement bars and four different types of surrounding concrete: normal strength concrete (NSC), steel fibber reinforced concrete (SFRC) and two structural lightweight aggregate concretes (SLWAC) is here presented. Five beam-tests according to Standard RILEM (1982) [5] were conducted on specimens under monotonously increased loading. Bond-slip response curves betw...

Características clínicas demográficas em 99 episódios de febre reumática no Acr...

OBJETIVO: Relatar as manifestações clínicas e características demográficas de pacientes com febre reumática atendidos em serviço público no Estado do Acre. MÉTODOS: Estudo de corte transversal em pacientes atendidos consecutivamente no Ambulatório de Cardiologia da FUNDHACRE, avaliados através de questionário contendo dados demográficos, clínicos e laboratoriais. O diagnóstico de febre reumática foi realizado a...

Hemorrhagic encephalopathy in dengue shock syndrome: a case report

Dengue fever is the most important arboviral infection in the world, with an estimated 100 million cases per year and 2.5 billion people at risk. Encephalopathy is a rare complication of dengue virus infection and may occur as a consequence of intracranial hemorrhage, cerebral edema, hyponatremia, cerebral anoxia, fulminant hepatic failure with portosystemic encephalopathy, microcapillary hemorrhage or release ...

Aminotransferase changes and acute hepatitis in patients with dengue fever: ana...

INTRODUCTION: Type 3 dengue virus caused an extensive epidemic in the state of Rio de Janeiro in summer 2002. In some of the patients, it was found in an atypical form with increased aminotransferase levels and acute hepatitis. MATERIAL AND METHODS: An analysis was made of 1,585 serologically confirmed dengue cases at the Dengue Reference Center in Campos dos Goytacazes, Rio de Janeiro state. The grade of hepat...