Castelo Branco, Portugal

Polytechnic Institute of Castelo Branco
Castelo Branco, Portugal

The Polytechnic Institute of Castelo Branco is a state-run polytechnic institute of higher education, comprising schools of agriculture, technology, management, education, art and health. It is located in Castelo Branco, Portugal. The first two schools of this institution opened in 1982 - Escola Superior Agrária and 1985 - Escola Superior de Educação . Wikipedia.

Time filter
Source Type

Horta C.,Polytechnic Institute of Castelo Branco
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2017

The objective of this study was to assess the type and fractions of phosphorus (P) forms in composts and struvite and how these P forms affect the bioavailability of P in the soil. P fertilization was performed with compost from sewage sludge (CSS), compost from poultry litter (CPL) and struvite (SV) and compared with single superphosphate (SSP). P forms were quantified through a sequential fractionation scheme. The first extraction was performed with H2O, the second with 0.5 M NaHCO3, the third with 0.1 M NaOH and the fourth with 1 M HCl. The release of P over time, after soil P fertilization, was assessed by incubating the fertilizers with a low-P acid soil. P bioavailability was assessed through a micro-pot experiment with the incubated soils in a growth chamber using rye plants (Secale cereale L.). Inorganic P forms in the first two fractions represented ~50% (composts), 32% (SV) and 86% (SSP) of the total P; and in the HCl fraction, ~40% (composts), 26% (SV) and 13% (SSP) of the total P. Despite the variability of the P form fractions in the composts and struvite, the P release and bioavailability were similar among the fertilized treatments. The acidic nature of the soil, which improve solubility of Ca-P forms, and the high efficiency of rye, which favors P uptake, were factors that contributed to these results. © 2017 Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved.

Agency: European Commission | Branch: FP7 | Program: CP | Phase: ICT-2007.2.2 | Award Amount: 25.84M | Year: 2009

The European robotics industry plays a key role in maintaining our continents industrial base. The robotics industry is strong, but fragmented and dispersed. In the future, cutting-edge technology resulting from top-level research will be the decisive factor for success. Europe not only has a powerful robotics industry, but can also boast superb research. By drawing on these resources, ECHORD aims at producing new knowledge through advancing the state of the art in selected research foci and developing novel technology from which new products can be derived. Within ECHORD, opportunities for knowledge advancement and technology transfer between academia and industry will be created across the whole continent. This will be achieved through the solicitation of focused, small-size RTD projects, so-called experiments, which can be rapidly negotiated, funded and executed. Via these experiments, ECHORD will bring about a large-scale introduction of robotic equipment into research institutions. This is expected to result in both tangible and measurable out-comes in terms of the accelerated development of technologies, as well as the deployment of robotics technology into new scenarios for the direct application of research results. For ECHORD, three such scenarios have been defined: human-robot co-working, hyper flexible cells, and cognitive factories. The foremost purpose of the scenarios is to define an environment that is both scientifically challenging to research institutions and commercially relevant to robot manufacturers.

Fernandes N.O.,Polytechnic Institute of Castelo Branco | Carmo-Silva S.,University of Minho
International Journal of Production Research | Year: 2011

In this paper, we report a simulation study on the role of sequence-dependent set-up times in decision making at the order release level of a workload controlled make-to-order flow-shop. The study evaluates the potential for set-ups savings, dependent on the level of workload in the shop, for two alternative strategies, namely considering set-up times centrally, within the release decision or locally, within the dispatching decision. These strategies are compared and assessed on the basis of two main performance measures namely time in system and standard deviation of the job lateness. Results indicate that the local strategy, which has been traditionally adopted in practice and in most of the studies dealing with sequence-dependent set-up times, does not always give the best results. The release frequency and the shop workload appear critical to the selection of the strategy to adopt, strongly influencing system performance. © 2011 Taylor & Francis.

Fernandes N.O.,Polytechnic Institute of Castelo Branco | Carmo-Silva S.,University of Minho
International Journal of Production Economics | Year: 2011

Workload control is a production planning and control concept specifically designed for complex manufacturing environments. Past research on Workload control has been essentially focused on discrete order release. This means that release of orders to the shop floor takes places on a periodic basis. Continuous order release has been somehow neglected, in spite of its apparent potential for improving system performance, including the reduction of order flow times. This paper presents a simulation study of this order release approach. The study contributes for improving the basis for setting workload norms, selecting the workload control strategy and deciding upon routing alternatives under continuous order release. © 2010 Elsevier B.V. All rights reserved.

Soares V.N.G.J.,University of Beira Interior | Soares V.N.G.J.,Polytechnic Institute of Castelo Branco | Rodrigues J.J.P.C.,University of Beira Interior | Farahmand F.,Sonoma State University
Information Fusion | Year: 2014

Vehicular networks are characterized by a highly dynamic network topology, and disruptive and intermittent connectivity. In such network environments, a complete path from source to destination does not exist on the most part of the time. Vehicular delay-tolerant network (VDTN) architecture was introduced to deal with these connectivity constraints. VDTN assumes asynchronous, bundle-oriented communication, and a store-carry-and-forward routing paradigm. A routing protocol for VDTNs should make the best use of the tight resources available in network nodes to create a multi-hop path that exists over time. This paper proposes a VDTN routing protocol, called GeoSpray, which takes routing decisions based on geographical location data, and combines a hybrid approach between multiple-copy and single-copy schemes. First, it starts with a multiple-copy scheme, spreading a limited number of bundle copies, in order to exploit alternative paths. Then, it switches to a forwarding scheme, which takes advantage of additional contact opportunities. In order to improve resources utilization, it clears delivered bundles across the network nodes. It is shown that GeoSpray improves significantly the delivery probability and reduces the delivery delay, compared to traditional location and non location-based single-copy and multiple-copy routing protocols. © 2013 Elsevier Ltd. All rights reserved.

Caldeira J.M.L.P.,Polytechnic Institute of Castelo Branco | Caldeira J.M.L.P.,Upper Alsace University | Rodrigues J.J.P.C.,University of Beira Interior | Lorenz P.,Upper Alsace University
IEEE Communications Magazine | Year: 2012

The use of electronic health (eHealth) technologies in healthcare improves the quality of health services furnished to patients. The application of these technologies helps physicians and other health professionals to pursue early detection of abnormal status on patients' health. Body sensor networks are a type of wireless sensor networks aimed to be deployed on persons in order to collect physiological parameters for healthcare monitoring purposes. These BSNs are composed by several small sensors placed along patient's body, and capable to send (wirelessly) the collected health parameters to remote providers. BSNs need to operate every time and everywhere to transmit these important parameters to healthcare providers or automatic system to detect any anomaly in the patient health status. To provide this continuous monitoring of patients, it is mandatory to provide mobility support for the BSN so it can always be connected to some gateway to the Internet and therefore to back-end health providers. Several mechanisms with mobility support for mobile devices have been provided. However, the mobility support of a whole BSN has not been fully addressed. This article overviews available handover mechanisms used for wireless sensors mobility and proposes a new ubiquitous mobility approach for BSNs in healthcare. A case study with this new handover mechanism developed for a hospital infirmary is presented and highlights the gain of performances of the proposed solution. © 1979-2012 IEEE.

Antunes F.V.,University of Coimbra | Correia L.,Polytechnic Institute of Castelo Branco | Ramalho A.L.,Polytechnic Institute of Castelo Branco
International Journal of Fatigue | Year: 2015

Numerical models have been successfully developed to predict plasticity induced crack closure (PICC). However, despite the large research effort a full understanding of the links between physical parameters, residual plastic wake and PICC has not been achieved yet. The plastic extension of material behind crack tip, Δyp, obtained by the integration of vertical plastic deformation perpendicularly to crack flank, is proposed here to quantify the residual plastic field. The values of Δyp and PICC were obtained numerically in a M(T) specimen using the finite element method. An excellent correlation was found between PICC and Δyp which indicates that this parameter controls the phenomenon, and can be used to quantify the effect of physical parameters. An empirical model was developed to predict PICC assuming that the residual plastic field is a set of vertical plastic wedges, that the linear superposition principle applies and that the influence of a particular wedge exponentially decreases with distance to crack tip. The model was applied successfully to predict PICC for different residual plastic fields which provided an additional validation of Δyp as the parameter controlling PICC. © 2013 Elsevier Ltd. All rights reserved.

Dias A.M.P.G.,University of Coimbra | Jorge L.F.C.,Polytechnic Institute of Castelo Branco
Engineering Structures | Year: 2011

The load-carrying capacity and ultimate deformation capacity of timber-concrete composite systems can be significantly influenced by the ductility of the connection between the two materials. The use of more ductile connections can increase the load-carrying capacity of the composite system as well as its ultimate deformation capacity. In this work, the potential increase that might be expected for these two parameters due to the use of ductile connections will be assessed through numerical simulations, taking the non-linear behaviour of the connections into account.Furthermore, the connection ductility required to achieve the maximum load capacity depends on the mechanical properties of the connection as well as on the geometric and mechanical properties of the composite system. There are certain types of connections, such as notched connections, with a very brittle behaviour, for which the failure of the composite structure might be significantly influenced by connection failure, unless very small spacing between the fasteners is used. On the other hand, ductile connections such as dowel-type fasteners can be used with large spacing since their high ultimate deformation capacity is unlikely to be reached before the failure of either the concrete or the timber member. With the aim of identifying the maximum spacing that should be allowed for each specific connector type, numerical analyses were performed with the aim of identifying the maximum spacing that should be allowed for each specific connector type so as to maximize the load-carrying capacity and possibly increase the ultimate deformation capacity. © 2011 Elsevier Ltd.

Loading Polytechnic Institute of Castelo Branco collaborators
Loading Polytechnic Institute of Castelo Branco collaborators