90 documents found, page 1 of 9

A SWOT analysis of organizations in the agri-food chain sector from the norther...

Research on modern agri-food chains aims to enhance flexibility by analyzing supply chain aspects to identify improvement opportunities. A SWOT analysis of 39 agri-food sector organizations using a SWOT analysis organized using the PESTEL and MEETHS categories was conducted to evaluate the stakeholders’ needs in this sector of activity in Northern Portugal. Logistic regressions were used to compute inferential ...

Differential responses of photosynthesis, yield and soil properties 4 years aft...

Olive orchards represent a key agricultural system in the Mediterranean Basin. Soil degradation processes associated with unsustainable agronomic practices and climate change could severely impact the sustainability of Mediterranean rainfed olive orchards. In this context, soil amendments are important tools that can be used to enhance soil fertility for sustained environmental quality and plant performance. In...

Deep learning soft-decision GNSS multipath detection and mitigation

A technique is proposed to detect the presence of the multipath effect in Global Navigation Satellite Signal (GNSS) signals using a convolutional neural network (CNN) as the building block. The network is trained and validated, for a wide range of /0 values, with a realistic dataset constituted by the synthetic noisy outputs of a 2D grid of correlators associated with different Doppler frequencies and code dela...

Performance of GNSS evil waveform detectors in the presence of multipath

The detection of evil waveforms (EWF) in GNSS signals is crucial to refrain from using anomalous signals in the PVT solution, which could degrade significantly its accuracy. The EWF detectors are, in general, based on the computation of the distortion of the code autocorrelation function. Thus, the multipath effect, an independent mechanism that also distorts the autocorrelation shape, can be incorrectly assume...

Signal quality monitoring aspects in GNSS signals affected by evil waveforms

Evil waveforms (EWF) are anomalies in the GNSS transmitted signals that can degrade significantly the accuracy of the PVT solution. The cross-correlation function of the incoming signal disturbed by EWF distortion and the locally-generated code signal is obtained analytically for threat models TM-A, TM-B and TM-C. These results are useful to evaluate efficiently the performance of EWF detectors, namely the dete...

O processo de escolha de um vinho - atributos diferenciares. O caso particular ...

Choices in sustainable food consumption: how spanish low intake organic consume...

The consumption of organic products has consistently increased over the last decades, covering increasingly diversified consumers, both in the characteristics and the reasons associated with consumption. This heterogeneity evidences the need to examine in depth the reasons for the purchase and consumption of these products. The core aim of this study is related to the motivational drivers of organic consumption...

Polyphenol composition and biological activity of Thymus citriodorus and Thymus...

The polyphenol compositions of Thymus × citriodorus and Thymus vulgaris extracts as obtained by exhaustive hydroethanolic (HE) extraction and aqueous decoction (AD) were compared. In addition, their compositions and bioactivities were compared to those of Thymus pulegioides and Thymus mastichina, grown under the same edaphoclimatic conditions, and Thymus carnosus. Rosmarinic acid was the most abundant polypheno...

Thymus zygis subsp. zygis an Endemic Portuguese Plant: Phytochemical Profiling,...

Thymus zygis subsp. zygis is an endemic Portuguese plant belonging to the Thymus zygis species. Although T. zygis is commonly used as a condiment and as a medicinal herb, a detailed description of the polyphenol composition of hydroethanolic (HE) and aqueous decoction (AD) extracts is not available. In this work, we describe for the first time a detailed phenolic composition of Thymus zygis subsp. zygis HE and ...

A natureza elusiva das melanoidinas dos alimentos: o exemplo das bebidas de café