Repositório Comunidade: CCT
https://hdl.handle.net/1822/1220
CCT2024-03-28T23:25:42ZCost effective CTD for long term deployments in water columns
https://hdl.handle.net/1822/89783
Título: Cost effective CTD for long term deployments in water columns
Autor: Rocha, J. L.; Matos, T.; Martins, Marcos Silva; Lopes, Sérgio F.; Gomes, Pedro T.; Henriques, Renato F.; Gonçalves, L. M.
Resumo: Estuaries have the particularity of being in constant change concerning the salinity of the water, since the river carries fresh water to the mouth, while the force of the tide pushes salty water upstream, reaching several kilometers upstream given the right conditions. These bodies of water do not mix instantly, allowing the appearance of a distinct border between the two, known as the front. This document presents a monitoring system composed of four-probe salinity sensors, which acquire conductivity, temperature, and pressure data to calculate salinity, arranged in such a way as to make measurements along the water column, to detect the shape of the front, as well as monitoring the estuary. The sensors, and the monitoring system in general, are cost-effective, low-power, and accurate in long-term deployment, even when installed in adverse conditions such as at sea. The sensors consume $26 \mu \mathrm{A}$ in sleep mode and 10 mA during measurement, and the measurement time is less than 100 ms. The choice of a four-point configuration allows overcoming the inevitable decay of the electrodes and possible measurement errors, contributing to autonomous long-term operation.
<b>Tipo</b>: conferencePaperThe role of the iron oxyhydroxides and efflorescent sulfates in remediation by natural attenuation of mining contaminated systems
https://hdl.handle.net/1822/89495
Título: The role of the iron oxyhydroxides and efflorescent sulfates in remediation by natural attenuation of mining contaminated systems
Autor: Barroso, Ana; Antunes, Isabel Margarida; Marinho Reis, A. Paula; Vasques, Isabela; Antelo, Juan; Fiol, Sarah; Gomes, Patricia; Valente, Teresa Maria Fernandes
<b>Tipo</b>: conferenceAbstract2024-03-13T13:45:57ZPelotherapy and electrotherapy in one single therapeutic modality
https://hdl.handle.net/1822/89494
Título: Pelotherapy and electrotherapy in one single therapeutic modality
Autor: Bastos, Carla Marina; Rocha, Fernando; Gomes, Nuno; Marinho Reis, A. Paula
Resumo: [Excerpt] Introduction Pelotherapy and electrotherapy are therapeutic methodologies with proven success in physical medicine and rehabilitation (PMR) and dermatology fields. The main purpose of these therapeutic modalities is to reduce pain, accelerate wound healing, alleviate muscle spasms, and improve mobility and muscle tone.[...]
<b>Tipo</b>: bookPart2024-03-13T13:15:20ZBioaccessibility by perspiration uptake of minerals from two different sulfurous peloids
https://hdl.handle.net/1822/89490
Título: Bioaccessibility by perspiration uptake of minerals from two different sulfurous peloids
Autor: Bastos, Carla Marina; Rocha, Fernando; Patinha, Carla; Marinho Reis, A. Paula
Resumo: Testing the risks of peloid usage in thermal centers, spas, or at home is essential for establishing safety guidelines regarding peloid formulations and releasing concerning substances. Additionally, evaluating the beneficial effects of specific elements on human health helps understand the therapeutic action and effectiveness of pelotherapy for dermatological or musculoskeletal disorders. A methodology was developed to study the biogeochemical behavior of elements in formulated peloids. With periodic stirring, two peloids were created with the same clay and two different sulfurous mineral-medicinal glasses of water for 90 days. Bentonite clay, rich in smectite and primary exchangeable cations Ca and Mg, with high heat capacity, was used. The mineral-medicinal waters were collected from recognized Portuguese thermal centers for their efficacy in treating rheumatic, respiratory, and dermatological pathologies. The peloids were used directly from the maturation tank without drying, and a reference sample of bentonite mixed with demineralized water was prepared. An artificial perspiration test simulated the peloids’ interaction with the skin. Thirty-one elements extracted from the two prepared peloids were analyzed using ICP-MS. The data were analyzed and compared to the original clay's mineralogical composition and the maturation tanks' supernatant composition. The solubility of potentially toxic elements and the bioaccessibility of metals through perspiration were low, with undetectable amounts extracted from the samples. This analytical method provided reliable information on dermal exposure and identifying elements that may enter the bloodstream, requiring the implementation of surveillance and control measures.
<b>Tipo</b>: conferenceAbstract2024-03-13T12:21:50ZGeological setting of the chipindo mine: a preliminary analysis
https://hdl.handle.net/1822/89489
Título: Geological setting of the chipindo mine: a preliminary analysis
Autor: Kumoleha, António; Marinho Reis, A. Paula; Nogueira, Pedro; Simões, P. P.
Resumo: As a contribution to the metallogenic model for the Chipindo mineral deposit, the preliminary characterization of the geology of the area is presented. The open-pit mine is located in Huíla, Angola, and currently explores primary gold. It is included in the South Sheet D-33/J of Caconda from the Geological Map of Angola at 1:250 000 scale. - essentially, composed by leucocratic granites, with potassium feldspar phenocrysts of idiomorphic habit and poikilitic texture. The exploration targets mineralised quartz veins. For this work, and as part of a PhD thesis of Kumoleha A., a total of 49 rock and mineral samples were collected in the mining area for the lithological and mineralogical characterization of the deposit. 21 samples were collected in the mining area, including the mineralized structures, and host rocks. The field description encompasses i) Quartz associated with leucogranites; ii) Mineralized quartz veins; iii) Pegmatitic veins; iv) Strongly fractured quartz; v) Quartz veins with en-echelon structures; vi) Weakly mineralized quartz; vii) Highly altered and deformed volcanic tuffs; viii) Volcanic rocks, with copper sulphides (mainly bornite); ix) Altered dolerite rock. To characterise the regional geological setting, 20 rock samples were collected in the following geological units: a) Acid metavulcanites; b) Granites to biotitic-amphibolic, porphyroid granodiorites; c) Gabbros, diorites and quartz-diorites, variably foliated, metamorphosed and/or metasomatized; d) Coarse-grained porphyroid leucogranites. Eight samples of mine waste were collected from the floatation tanks for geochemical analysis and study of tailings, including the potential environmental impact. The sampling and sample description already carried out allows the preliminary characterization of this gold deposit. Future investigation will include mineralogical, geochemical, petrographic and metallographic studies that will certainly increase our understanding of the processes that formed this mineral deposit.
<b>Tipo</b>: conferenceAbstract2024-03-13T12:11:41Z