Browsing by Issue Date, starting with "2017"
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- Hypermedia APIs for the Web of ThingsPublication . Martins, Jaime; Mazayev, Andriy; Correia, NoéliaThe Web of Things is a new and emerging concept that defines how the Internet of Things can be connected using common Web technologies, by standardizing device interactions on upper-layer protocols. Even for devices that can only communicate using proprietary vendor technologies, upper-layer protocols can generally provide the necessary contact points for a high degree of interoperability. One of the major development issues for this new concept is creating efficient hypermedia-enriched application programming interfaces (APIs) that can map physical Things into virtual ones, exposing their properties and functionality to others. This paper does an in-depth comparison of the following six hypermedia APIs: 1) the JSON Hypertext Application Language from IETF; 2) the Media Types for Hypertext Sensor Markup from IETF; 3) the Constrained RESTful Application Language from IETF'; 4) the Web Thing Model from Evrythng; 5) the Web of Things Specification from W3C; and 6) the Web Thing API from Mozilla.
- Human resources management skills needed by organizationsPublication . Sousa, Maria; Benlamri, R.; Sparer, M.This article analyses the concept of skills and also investigates the skills needed by organizations in Human Resources as a strategic area. The relevance of \ purpose is to identify the skills to be developed in Human Resources Courses in Higher Education. The skills needed by the organizations were identified through document analysis based on prospective studies developed in industry between 2011 and 2014. The research problem considered the analytical dimension of skills development in organizations anchored to the following research questions: What are the skills needed to be developed in Higher Education Courses to transform the Human Resources function strategic for organizations? This study is centred on the research of more relevant skills which can contribute to transform the Human Resources function strategic for organizations contributing for the improvement of their performance and competitiveness in the market.
- The continental shelf off the Guadiana estuaryPublication . Mendes, Isabel; Rosa, Francisca; Moura, Delminda; Mendes, I.; Gomes, Ana; Aníbal, JaimeThe Continental shelf is the seafloor area around a large land mass where the sea is relatively shallow compared with the open ocean.This major physiographic domain is comprised between the shoreline and the shelf break located at variable water depths (generally, around 200 m water depth) and variable extensions (average width of about 80 km). The continental shelf off the Guadiana estuary is the area in front of the Guadiana River mouth,which is influenced by the discharges of the Guadiana River Basin.This area is located in the southern border between Portugal and Spain, in the middle part of the northern Gulf of Cadiz continental shelf, southwestern Iberian Peninsula.
- Monitoring bubble production in a seagrass meadow using a source of opportunityPublication . Felisberto, Paulo; Rodríguez, Orlando; Silva, João P.; Jesus, Sergio; Ferreira, Hugo Q.; Ferreira, Pedro P.; Cunha, Maria E.; de los Santos, Carmen B.; Olivé, Irene; Santos, RuiUnder high irradiance, the photosynthetic activity of dense seagrass meadows saturates the water forming oxygen bubbles. The diel cycle of bubble production peaks at mid-day, following light intensity pattern. It is well known that bubbles strongly affect the acoustic propagation, increasing signal attenuation and decreasing the effective water sound speed, noticeable at low frequencies. Thus, the diurnal variability of bubbles may show an interference pattern in the spectrograms of low frequency acoustic signals. In an experiment conducted in July 2016 at the Aquaculture Research Station of the Portuguese Institute for the Sea and Atmosphere in Olhão, Portugal, the spectrograms of low frequency (<20kHz) broadband noise produced by water pumps in a pond of 0.48ha covered by the seagrass Cymodocea nodosa showed interference patterns that can be ascribed to the variability of the sound speed in the water. Preliminary analysis suggests that the daily cycle of bubble concentration can be inferred from these interference patterns.
- Understanding paleolithic human coastal adaptations in southwetern Iberian Peninsula (Paleocoast Project)Publication . Marreiros, Joao; Duarte, D. N.; Regala, Frederico; Dores, Tiago; Francisco, Rui; Soares, RicardoThe geological and geomorphological formations in the Atlantic shore of Southern Portugal in Algarve are characterized by karstic formations. Karstic features, such as natural caves and shelters, have long been seen as an attractive ecological and geological landscape to early human occupation during the Pleistocene and Early Holocene. The project PaleoCoast, Paleolithic Human Coastal Adaptations in Southwestern Iberian Peninsula, aims to locate and identify coastal karst formation, and assess its speleological and geological characterization, and archaeological potential. This poster introduces the PaleoCoast research project, including research scope, goals and methods, and an overview on the preliminary results from the pilot study conducted in 2017.
- Modeling nitrate-contaminated groundwater discharge to the Ria Formosa Coastal Lagoon (Algarve, Portugal)Publication . Hugman, Rui; Stigter, Tibor; Costa, Luis; Monteiro, José PauloA numerical flow and transport model is developed to assess groundwater discharge and nutrient transport to the Ria Formosa coastal lagoon in southern Portugal. A total N load of 350 ton/year is estimated for the considered area, of which agriculture accounts for 73% of total N load, and domestic effluent and atmospheric deposition for the remaining 9% and 18% respectively. Model results suggest that nutrient recycling has led to the high concentrations observed in the Campina de Faro (M12) aquifer, but is still insufficient to account for observed values at the coastline. Furthermore results suggest that even for the best case mitigation scenario, good quality status will not be achieved by 2027, as mandated by the EU Water Framework Directive.
- Equidade e bem-estar no uso de paragens de autocarroPublication . Pires Rosa, Manuela; Gil, Fábio CavacoO turismo acessível está promovendo mudanças profundas nos sistemas de transporte, que requerem meios de transporte específicos e ambientes físicos urbanos que integram paragens de autocarros que garantam equidade social, segurança e bem- estar para todos os turistas. As pessoas com mobilidade reduzida têm necessidades especiais. Em consequência, os espaços edificados, os veículos de transporte, a informação e os serviços devem ter em conta os princípios do Design Universal que garantem um “uso equitativo”, “flexível”, “intuitivo”, “percetível”, “baixo esforço físico”, “tolerável” e espaços “bem dimensionados” para diversos usuários. Estes princípios também consideram outras pessoas com requisitos de acesso, como é o caso dos turistas com trolleys ou com carrinhos de bebé. Uma paragem de autocarro, com atributos de qualidade, necessita de algumas características inovadoras nos abrigos de passageiros, nas áreas de espera, no revestimento dos pavimentos e na rede pedestre. Pretende-se apresentar os atributos de uma paragem de autocarros e listar indicadores de desempenho para avaliar a sua qualidade. A metodologia de análise e diagnóstico das condições de acessibilidade é aplicada em três paragens de autocarro localizadas na cidade de Faro, Portugal. O diagnóstico permite concluir que a renovação destas interfaces modais deve ser considerada nos processos atuais de regeneração urbana.
- Chemical stressors in the Guadiana RiverPublication . Bebianno, Maria João; Gonzalez-Rey, Maria; Veiga-Pires, C.The Guadiana River,the fourth major river of the Iberian Peninsula,represents an important aquatic system from a socio,geo and ecological point of view for Portugal and Spain. Important economic activities such as agriculture,tourism and aquaculture are present along with several economic facilities such as harbour (commercial and fishing),marina and small shipyards for construction and repair of small vessels.All these activities generate wastes some of them toxic to the aquatic environment.
- UHMWPE/HDPE in-reactor blends, prepared by in situ polymerization: synthetic aspects and characterizationPublication . Ferreira, A. E.; Cerrada, M. L.; Pérez, Ernesto; Lorenzo, V.; Vallés, E.; Ressia, J.; Cramail, H.; Lourenco, J. P.; Ribeiro, M. R.This work covers the synthesis and characterization of in-reactor Ultra-High Molecular Weight Polyethylene/ High Density Polyethylene, UHMWPE/HDPE, blends by in situ polymerization in a single reactor, through dual catalyst immobilization. These blends are synthesized combining two different catalysts (one for each targeted molar mass) co-immobilized in mesoporous Santa Barbara Amorphous, SBA-15, particles. First, the ethylene polymerization behavior is investigated, under different polymerization conditions. Then, studies on the thermal, mechanical and rheological characteristics of the produced in-reactor blends are presented and their performance is compared and discussed in a comprehensive way. Moreover, the effect of different filler contents on the properties exhibited by the resulting materials is investigated. Results have shown that these in-reactor UHMWPE/HDPE blends exhibit a complex thermal, mechanical and rheological behavior, which depends mainly on the proportion between the two polymer components and on the amount of SBA-15.
- Modelling of optoelectronic circuits based on resonant tunneling diodesPublication . Rei, João F. M.; Foot, James A.; Rodrigues, Gil; Figueiredo, José; Costa, M. F. M.Resonant tunneling diodes (RTDs) are the fastest pure electronic semiconductor devices at room temperature. When integrated with optoelectronic devices they can give rise to new devices with novel functionalities due to their highly nonlinear properties and electrical gain, with potential applications in future ultra-wide-band communication systems (see e.g. EU H2020 iBROW Project). The recent coverage on these devices led to the need to have appropriated simulation tools. In this work, we present RTD based optoelectronic circuits simulation packages to provide circuit signal level analysis such as transient response. We will present and discuss the models, and evaluate the simulation packages.