Encontrados 24 documentos, a visualizar página 1 de 3

Diagnóstico imunológico de doenças associadas a vectores existentes em Portugal

Clinical presentaion and laboratory findings for the first autochthonous cases ...

Integração duma plataforma ATM no Campus da Universidade de Aveiro

This paper presents the integration of an ATM (Asynchronous Transfer Mode) network in the Campus of the University of Aveiro, that conducted to its implementation. After being pointed out the motivations to its implementation, the actual infrastructures and technologies are shortly described. Then, the main guidelines to its possible utilization are drawn. Finally, the resultingconfiguration is presented as wel...

Encaminhamento em Redes Heterogéneas: um estudo de caso baseado na Rede da Univ...

This article addresses the routing problem in heterogeneous local area networks. In particular, the routing requirements derived from the integration of an ATM network in the University of Aveiro (UA) data network are addressed. ATM technology enables a more flexible network management at cost of an extended complexity in the required routing solutions. ATM technology enables the&n...

Infecção por vírus West Nile [Flavivírus] em Portugal. Considerações acerca de ...

O vírus West Nile [WN] é um flavivírus transmitido por mosquitos e agente etiológico de febre e de doença neuroinvasiva. O vírus WN mantém-se na natureza em ciclos enzoóticos que envolvem mosquitos ornitofílicos, como vectores primários, e algumas espécies de aves como reservatório primário. A sua presença em Portugal é conhecida, surgindo esporadicamente alguns casos de infecção em equinos e humanos. Em 2010 f...

Development of a Tomato spotted wilt virus (TSWV) risk evaluation methodology ...

A risk map for the Tomato spotted wilt virus (TSWV) was elaborated for the main Portuguese processing tomato producing region, the "Ribatejo e Península de Setúbal" region, where periodically this virus causes severe losses. Forty nine tomato fields were monitored. Risk factors for TSWV infection were identified and quantified according to their relative importance in TSWV incidence. The risk factors consider...

Efficient ion blocking in gaseous detectors and its application to gas-avalanch...

http://www.sciencedirect.com/science/article/B6TJM-4T8HH99-2/2/f970f5561a88e355e57ce6de077a59fa

The Photon-Assisted Cascaded Electron Multiplier Operation in CF _4 for Ion Ba...

The operation of the recently introduced photon assisted cascaded electron multiplier (PACEM) in CF4 is investigated. The PACEM uses the VUV scintillation produced in the electron avalanches of the first multiplier of the cascade to transfer the signal to the subsequent ones. The VUV scintillation induces the emission of a large number of photoelectrons from a Csl photocathode placed on the top-surface of the s...

PACEM: a new concept for high avalanche-ion blocking

We present the Photon-Assisted Cascaded Electron Multiplier (PACEM) as a potential alternative for ion back-flow suppression in gaseous cascade electron multipliers. Using a Micro Hole and Strip Plate-Gas Electron Multiplier (MHSP-GEM) configuration, the number of ions flowing back to the scintillation region is about 1.5 ions per primary electron at an optical gain of 6.5 and a drift field of 0.1 kV/cm, and ab...

Micro-hole and strip plate-based photosensor

The performance of a new VUV photosensor, based on an micro-hole and strip plate (MHSP) electron multiplier with a CsI photocathode deposited on its top electrode, is described. This photosensor presents gains above 104 when operating in an Ar-5%Xe gas mixture at 1 atm. Although the gain of a single MHSP is not sufficient for efficient detection of single photons, this simple UV photosensor may be useful for th...