134 documents found, page 1 of 14
A portable and low-cost optical device for pigment-based taxonomic classificati...
Magalhães, Vitor; Pinto, Vânia Cristina Gonçalves; Sousa, Paulo Jorge Teixeira; Afonso, José A.; Gonçalves, L. M.; Fernández, Emilio; Minas, GraçaThe proliferation of certain phytoplankton species may lead to harmful algal blooms (HABs) that can affect living resources and human health. Therefore, an accurate identification of phytoplankton populations is essential for the sustainable management of some activities relevant for the blue economy, such as aquaculture, being also relevant for environmental monitoring and marine research purposes. Microalgae ...
Polymer sorting through fluorescence spectra
Penso, Camila Maria Ramos Aires Moreira; Castanheira, Elisabete M. S.; Paiva, Maria C.; Gonçalves, L. M.This study identifies different polymers using their fluorescent data under various light wavelengths that ranged from 245 nm to 345 nm in 10 nm intervals. The primary goal of the proposed method is to select optimal wavelengths that can lead to the accurate identification of six polymers: polyamide 6 (PA6), polymethyl methacrylate (PMMA), polypropylene (PP), polystyrene (PS), high-density polyethylene (HDPE), ...
Portable and low-cost fluorometer for phytoplankton monitoring
Sá, Leonardo Rafael Correia; Pinto, Vânia Cristina Gonçalves; Sousa, Paulo Jorge Teixeira; Magalhães, Vitor H.; Carvalho, Denise Andreia MotaPhytoplankton monitoring using fluorescence spectroscopy techniques has been frequently used over time. This monitoring is based on the detection of the main photosynthetic pigment, chlorophyll-a, as its concentration is widely used as a proxy of phytoplankton biomass in the water column. However, the fluorometers available for their measurement and use in the field are still quite expensive and bulky, which li...
Low cost, portable in-situ spectral analysis sensor for monitoring water contam...
Lopes,Pedro Dinis; Penso, Camila Maria Ramos Aires Moreira; Carneiro, Catia Filipa; Gonçalves, L. M.Protecting water resources is essential for mitigating the impacts of global warming. Preserving hydrological basins and implementing sustainable practices in water use plays a critical role in maintaining natural ecosystems. In-situ sensors are a highly valuable tool for continuously monitoring these resources. They provide essential information that enables responsible authorities to act promptly and minimize...
Marine sensors: recent advances and challenges
Gonçalves, L. M.; Martins, Marcos Silva; Lima, Rui Alberto Madeira Macedo; Minas, Graça[Excerpt] The ocean has a huge impact on our way of life; therefore, there is a need to monitor and protect its biodiversity. Additionally, the ocean industrial potential for health, minerals, and oil has promoted the need for constant and real-time monitoring. Due to all of these concerns, it is important to develop efficient and smart marine sensors to improve our knowledge of the sea environment and to suppo...
Wave profile and tide monitoring system for scalable implementation
Rocha, J. L.; Matos, Tiago; Faria, C. L.; Penso, Camila Maria Ramos Aires Moreira; Martins, Marcos Silva; Gomes, P. A.; Gonçalves, L. M.Presentation of a wave profile and tide monitoring system, with low-cost and low-power pressure sensors connected to a datalogger in a wired or acustic network.
Wave profile and tide monitoring system for scalable implementation
Rocha, J. L.; Matos, Tiago; Faria, C. L.; Penso, Camila Maria Ramos Aires Moreira; Martins, Marcos Silva; Gomes, P. A.; Gonçalves, L. M.A versatile, miniaturized, cost-effective, low-power wave profile and tide monitoring system, capable of long-term and scalable deployment, was developed to integrate pressure and temperature sensors in an RS485 network, for standalone operation with organized memory or real-time shared data monitoring. The pressure and temperature sensors are controlled by low-power microcontrollers, that communicate the data ...
A microfluidic device for size-based microplastics and microalgae separation
Magalhães, Vitor H.; Pinto, Vânia Cristina Gonçalves; Sousa, Paulo Jorge Teixeira; Gonçalves, L. M.; Fernández, Emilio; Minas, GraçaPhytoplankton are microscopic marine algae that constitute the foundation of the aquatic food web. They are essential to drive life in the oceans but can also be harmful in the form of algae blooms, either by producing phytoplankton toxins or massive biomass proliferation. Microalgae cell size is a relevant morphologic trait that can help identifying species responsible for these blooms at early stages. Sorting...
Inductive salinity sensor
Barroso, Maria; Rocha, J. L.; Faria, C. L.; Gomes, P. A.; Gonçalves, L. M.Salinity determinations are usually made indirectly, measuring electrical conductivity, which depends on salinity and temperature. Unusual conductivity and salinity are indicative of pollution, regardless anthropogenic or natural sources. Aquatic species adapt to specific salinity levels. If this level is altered, it can result in the death of them, because there are changes in the oxygen concentrations. The go...
Low-cost portable sensor for uplastics differentiation
Penso, C. M.; Paiva, M. C.; Viana-Gomes, J.; Rocha, J.L.; Gonçalves, L. M.Na última década, os μplásticos tornaram-se um dos principais problemas de poluição nos oceanos, cursos de água e rios, atraindo atenção devido aos efeitos nocivos que provocam no meio ambiente e na saúde. Os métodos atuais para quantificação de μplásticos incluem imagiologia hiperespectral, espectroscopia de Raman e espectroscopia de infravermelho por transformadade Fourier (FTIR). No entanto, estes equipament...