The Origin Of The Cabacal Cu-au Deposit, Alto Jauru Greenstone Belt, Brazil

The Cabacal Deposit is located in the southern part of the Amazonian Craton (Brazil). It is hosted within the felsic volcanic and volcanoclastic rocks of the Proterozoic Alto Jauru Greenstone Belt.;The processes leading to the deposit are under debate. Some consider the Cabacal Deposit to be of shear-related origin, whereas some interpreted it to be a syngenetic deposit. The present study concludes that the Cabacal Deposit is a deformed volcanogenic massive sulphide deposit. The age of the volcanic system is around 1.7Ga, and of deformation is around 1.6Ga.;Host rocks are commonly sheared parallel to lithological boundaries. Intensive alteration affected the host rocks in the vicinity of the ore bodies. This alteration zone consists of an inner chloritized core, surrounded by a sericitic zone similar to those that occur in VMS deposits. The felsic volcanic host rocks have chemical characteristics pointing to their generation in an island arc environment.;Of the intrusive bodies of the area, the Cabacal Tonalites have some chemical similarities with the felsic volcanic rocks from the Manuel Leme Formation. They also show characteristics of an island arc environment. Possibly, the intrusion took place simultaneously with the shear that affected that area.;Ore in Cabacal is distributed in three zones (South, Central and East Copper Zones) composed of a portion rich in copper and a stringer zone of quartz and sulphide veins. The Central Copper Zone shows a massive sulphide body. Mineralization occurs as landed, veined, breccia and massive ore.;The first mineralizing event in Cabacal is syngenetic with the Manuel Leme formation deposition and it generated a VMS deposit. The second mineralizing event is deformation-related, and redistributed gold into structural features, creating zones with high gold grades. Different fluids were involved in the first mineralization event. Geochemical and thermometric studies suggest fluids with low salinities and of a wide range in temperature (240 to 340{dollar}\sp\circ{dollar}C). Gold transport occurred as Au(HS){dollar}\sp-\sb2{dollar} or AuCl{dollar}\sp-\sb2,{dollar} depending on the associated paragenesis. Results of oxygen isotope studies indicate a fluid with low {dollar}\delta\sp{lcub}18{rcub}{dollar}O ({dollar}-{dollar}2.85 to +2.3), similar to those from the Kuroko mines

To Ada or not To Ada: Adaing vs. Javaing in real-time systems

Ada is really an unfortunate Lady. After years fighting against C/C++ villains, her major lift-up (Ada 95) had brought up a promise of fortune. However, a new strong villain (Java) has appeared trying to end her struggle for survival. Ada has now to fight with her own weapons. She will only prosper by her own merits. But two questions emerge. Do they exist? Are they better than Java’s? Our opinion is that they do exist, and are not matched by any other programming languageFLAD; DEMEGI/FEU

The DEAR-COTS hard real-time subsystem

In this report, the Hard Real-Time Subsystem of DEAR-COTS is described, and the services it must provide are identified. This report is an input of ISEP/IPP and FEUP for the specification of the DEAR-COTS architecture (deliverable to the FCT)

Flow of low viscosity Boger fluids through a microfluidic hyperbolic contraction

In this work we focus on the development of low viscosity Boger fluids and assess their elasticity analyzing the flow through a microfluidic hyperbolic contraction. Rheological tests in shear and extensional flows were carried out in order to evaluate the effect of the addition of a salt (NaCl) to dilute aqueous solutions of polyacrylamide at 400, 250, 125 and 50 ppm (w/w). The rheological data showed that when 1% (w/w) of NaCl was added, a significant decrease of the shear viscosity curve was observed, and a nearly constant shear viscosity was found for a wide range of shear rates, indicating Boger fluid behavior. The relaxation times, measured using a capillary break-up extensional rheometer (CaBER), decreased for lower polymer concentrations, and with the addition of NaCl. Visualizations of these Boger fluids flowing through a planar microfluidic geometry containing a hyperbolic contraction, which promotes a nearly uniform extension rate at the centerline of the geometry, was important to corroborate their degree of elasticity. Additionally, the quantification of the vortex growth upstream of the hyperbolic contraction was used with good accuracy and reproducibility to assess the relaxation time for the less concentrated Boger fluids, for which CaBER measurements are difficult to perform

Nanogel formation of polymer solutions flowing through porous media

A gelation process was seen to occur when Boger fluids made from aqueous solutions of polyacrylamide (PAA) and NaCl flowed through porous media with certain characteristics. As these viscoelastic fluids flow through a porous medium, the pressure drop across the bed varies linearly with the flow rate, as also happens with Newtonian fluids. Above a critical flow rate, elastic effects set in and the pressure drop grows above the low-flow-rate linear regime. Increasing further the flow rate, a more dramatic increase in the slope of the pressure drop curve can be observed as a consequence of nanogel formation. In this work, we discuss the reasons for this gelation process based on our measurements using porous media of different sizes, porosity and chemical composition. Additionally, the rheological properties of the fluids were investigated for shear and extensional flows. The fluids were also tested as they flowed through different microfluidic analogues of the porous media. The results indicate that the nanogel inception occurs with the adsorption of PAA molecules on the surface of the porous media particles that contain silica on their surfaces. Subsequently, if the interparticle space is small enough a jamming process occurs leading to flow-induced gel formation

SAR calculation using FDTD simulations

The main intend of this work, is to determinate the Specific Absorption Rate (SAR) on human head tissues exposed to radiation caused by sources of 900 and 1800MHz, since those are the typical frequencies for mobile communications systems nowadays. In order to determinate the SAR, has been used the FDTD (Finite Difference Time Domain), which is a numeric method in time domain, obtained from the Maxwell equations in differential mode. In order to do this, a computational model from the human head in two dimensions made with cells of the smallest possible size was implemented, respecting the limits from computational processing. It was possible to verify the very good efficiency of the FDTD method in the resolution of those types of problems

Modulation of ankle antagonist co-activation during the transition from upright standing to gait and to sit in post-stroke subjects

Antagonist co-activation represents a neuronal command for the modulation of muscle synergies with postural control purposes, probably assuming a key role in the characterisation of tonus dysfunction in post-stroke subjects. This study aims to evaluate the ankle antagonist co-activation during different functional tasks in post-stroke subjects. The CONTRA limb presented decreased values in TA/SOL pair during upright standing and increased values in both muscle pairs during gait initiation compared to the IPSI limb (Table 1). No significant differences were found between tasks (Table 1). he IPSI and CONTRA limbs presented increased antagonist co-activation when an adequate antigravity function and the coordination of the tibia forward rotation are required, respectively. The comparison of these values with that obtained by healthy subjects seems to point to a bilateral postural control dysfunction in post-stroke subjects related to tonus modulation deficits that should be addressed in neurorehabilitation. Future studies with a higher sample are required to extend the results.info:eu-repo/semantics/publishedVersio

Intervenção especializada do enfermeiro

Nos últimos anos, no que à área da saúde diz respeito, assistimos a uma verdadeira progressão tecnológica, com o aparecimento de novas formas de tratamento que demonstram ser uma clara mais-valia para as pessoas de quem cuidamos. A oxigenoterapia hiperbárica é um desses exemplos, ao apresentar resultados positivos em diferentes especialidades da prática clínica, onde se inclui o tratamento da pessoa em situação crítica (Fernandes, 2009). Considerando a especificidade do ambiente hiperbárico e a complexidade associada, por norma, à condição clínica da pessoa em situação crítica, compreende-se que este meio terapêutico seja representativo de riscos acrescidos para este tipo de doentes. Os enfermeiros, pelas competências que lhes são reconhecidas, são perspetivados como uma peça imprescindível na promoção da segurança nos cuidados de saúde (Fernandes & Queirós, 2011). Neste sentido, como ponto de partida para este trajeto, elaborei uma revisão integrativa da literatura com a seguinte questão de investigação: “Qual a intervenção do enfermeiro na promoção da segurança da pessoa em situação crítica submetida a oxigenoterapia hiperbárica?”. Com o objetivo major de desenvolver competências especializadas de enfermagem no âmbito da promoção da segurança da pessoa em situação crítica, realizei três estágios, em contexto de serviço de urgência e de unidades de medicina hiperbárica, onde, através das atividades efetuadas, desenvolvi competências em diferentes áreas, entre as quais destaco: a prestação de cuidados à pessoa e família a vivenciar processos complexos de doença crítica, a gestão e garantia da eficácia e efetividade comunicacional, a maximização na prevenção e controlo de infeção e a disseminação de conhecimento, com vista à progressão e melhoria contínua da prática de enfermagem (Regulamento n.º 429/2018, 2018; Regulamento n.º 140/2019, 2019). O percurso efetuado, descrito e analisado ao longo do presente documento, foi sustentado nas Teorias de Meyer e Lavin (2005) e de Locsin (2005).In the recent years, regarding health area, we have witnessed a true technological breakthrough, with the appearance of new methods of treatment, which proved to be a clear added value for the people we take care for. Hyperbaric oxygen therapy is one such example, as it shows positive results in different specialties of clinical practice, including the treatment of critically ill patient (Fernandes, 2009). Considering the specificity of the hyperbaric environment and the complexity associated to the clinical condition of the critically ill patient, it is understandable, that this therapeutic domain represents increased risks for this type of patient. Nurses, due to their recognized competences, are seen as an essential piece in safety promotion in healthcare field (Fernandes & Queirós, 2011). In this regard, as a starting point for this journey, I have prepared an integrative literature review with the subsequent research question: "What is the nurse's intervention in promoting the safety of critically ill patient undergoing hyperbaric oxygen therapy?". With the main goal of developing specialized nursing skills, in the context of safety promotion of critically ill patient, I carried out three internships, within the context of an emergency care service and hyperbaric medicine units where, through the activities prompted out, I have developed skills in different areas, among which I highlight: the provision of care to the person and family experiencing complex processes of critical illness, the management and guarantee of communication efficacy and effectiveness, the maximization of infection prevention and control and the dissemination of knowledge, with a view to progression and continuous improvement of nursing practice (Regulamento n.º 429/2018, 2018; Regulamento n.º 140/2019, 2019). The course taken, described, and analyzed throughout this document, was supported by the Theories of Meyer and Lavin (2005) and Locsin (2005)