Encontrados 15 documentos, a visualizar página 1 de 2
Enhancing tourism through viticulture enterprises in Douro Region: The Inov@Dou...
Cunha, Carlos R.; Peres, Emanuel; Morais, Raul; Reis, Manuel CabralThis paper describes a business and technological model proposal, known as Inov@Douro, intended to support and to promote competitive and sustained precision agriculture practices in the Portuguese Douro Region. Our approach is based on a distributed cooperative network, tailored to meet the specific needs of viticulture enterprises which also explore tourism as a valuable national and international business so...
Contextualized ubiquity: a new opportunity for rendering business information a...
Cunha, Carlos R.; Peres, Emanuel; Morais, Raul; Bessa, Maximino; Reis, Manuel CabralStating that information and services are ubiquitous, means that they are available anywhere, anytime. The development of mobile-devices with wireless network-access capabilities, together with the decrease in network-traffic costs and the proliferation of free wireless hotspots, makes the use of mobile-devices, as Internet access tools, increasingly common and attractive. With novel forms of presenting informa...
Bioimplantable impedance and temperature monitor low power micro-system suitabl...
Miranda, N.; Morais, Raul; Dias, Maria Isabel R.; Viegas, Carlos A.; Silva, F.; Serôdio, C.; Almeida, José Carlos; Azevedo, Jorge Manuel Teixeira deBased on cyclic physiologic animal bioimpedance and body temperature a new method is being evaluated to predict estrus in dairy cattle with the aim of improving artificial insemination efficiency. Preceding in-vivo tests are being performed with a dedicated system based on the impedance converter AD5933, and a two-electrode configuration bioimplantable capsule. Acquired results will allow the optimal design of ...
Numerical analysis of the Edge Crack Torsion test for mode III interlaminar fra...
Marcelo Francisco de Sousa Ferreira de Moura; Maria Victoria Castro Fernandez; Alfredo Balacó Morais; Raul Duarte Salgueiral Gomes CampilhoA detailed numerical analysis of the edge crack torsion test was performed to verify its adequacy for the mode iii interlaminar fracture characterization of composite laminates. a new data reduction scheme based on specimen compliance was proposed. three-dimen- sional ï¬ nite element analyses including a cohesive damage model were performed in order to evaluate the accuracy of perceived giiic values obtained wi...
Concept study of an implantable microsystem for electrical resistance and tempe...
Morais, Raul; Valente, António; Almeida, José Carlos; Silva, Amélia; Soares, Salviano; Reis, M.C.; Valentim, Ramiro; Azevedo, Jorge Manuel Teixeira deIn cattle breeding industry, where artificial insemination techniques are employed, the successful detection of estrus onset leads to considerable cost-saving in herd management. One of the most reliable approaches is based on the determination of progesterone concentration in milk. However, these methods rely on the biosensor concept where a biological substrate is used in a chemical-binding reaction to direct...
Concept study of an implantable microsystem for electrical resistance and tempe...
Morais, Raul; Valente, A.; Almeida, José Carlos; Silva, Amélia M.; Soares, Salviano; Reis, M.J.C.S.; Valentim, Ramiro; Azevedo, JorgeIn cattle breeding industry, where artificial insemination techniques are employed, the successful detection of estrus onset leads to considerable cost-saving in herd management. One of the most reliable approaches is based on the determination of progesterone concentration in milk. However, these methods rely on the biosensor concept where a biological substrate is used in a chemical-binding reaction to direct...
An implantable microsystem for electrical resistance and temperature measuremen...
Morais, Raul; Valente, António; Almeida, José Carlos; Silva, Amélia; Soares, Salviano; Valentim, Ramiro; Azevedo, Jorge Manuel Teixeira deIn the cattle breeding industry, where artificial insemination techniques are employed, the successful detection of oestrus onset leads to considerable cost saving in herd management. One of the most reliable approaches is based on the determination of progesterone concentration in milk. However, these methods rely on the biosensor concept where a biological substrate is used in a chemical binding reaction to, ...
A wireless RF CMOS mixed-signal interface for soil moisture measurements
Morais, Raul; Valente, A.; Couto, Carlos; Correia, J. H.This paper describes a wireless RF CMOS interface for soil moisture measurements. The interface basically comprises a Delta-Sigma (ΔΣ) modulator for acquiring an external sensor signal, and a RF section where data is transmitted to a local processing unit. The ΔΣ modulator is a single-bit, second-order modulator and it is implemented using switched-capacitors techniques in a fully-differential topology. With a ...
Modeling, simulation and testing of a silicon soil moisture sensor based on the...
Valente, A.; Morais, Raul; Couto, Carlos; Correia, J. H.A silicon soil moisture sensor, based in the dual-probe heat-pulse (DPHP) method, was modeled, simulated and tested for achieving, with low-cost, accurate and reliable measurements. This method is based on the application of a heat pulse during a fixed interval of time. The maximum rise in temperature (ΔTM) is monitored by the measurement probe, placed at a certain distance of the heater source. A low-cost high...
A CMOS mixed-signal interface with a RF transmitter for a micromachined soil mo...
Morais, Raul; Valente, A.; Couto, Carlos; Correia, J. H.This paper describes a CMOS mixed-signal interface with a RF transmitter. This die is assembled in a Multi-Chip-Module (MCM) micro-system together with the micromachined soil moisture sensor to achieve a cost effective solution with accurate and reliable measurements for soil moisture in agriculture. The soil moisture probe, based on Dual-Probe Heat-Pulse (DPHP) method, is fabricated in bulkmicromachining techn...
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