Paulo Ribeiro - Academia.edu (original) (raw)

Papers by Paulo Ribeiro

Acta medica portuguesa, 2013

Embalming is a chemical process that aims the preservation and sanitization of the human body ind... more Embalming is a chemical process that aims the preservation and sanitization of the human body indefinitely. The technique of embalming is an important tool in teaching and research in anatomy enabling the preservation of cadaveric material in good conditions (lessening any significant structural changes and maintaining the natural appearance). This article presents the results of embalmed cadavers in the course of arterial perfusion, through the use of a perfusion machine, particularly designed to this objective, and which allows the control of the embalming fluid injection process. The influence of this technique and the optimization of its parameters on the final quality of embalming were evaluated by sequential histological analysis of the cadaveric tissues using an original method of classification of samples collected from 17 deceased corpses of the Corpses Donation Office of the Department of Anatomy of Faculdade de Ciências Médicas from Universidade Nova de Lisboa, subject to...

International Journal of Environmental Research and Public Health, 2021

Introduction. Digital impressions in implant dentistry rely on many variables, and their accuracy... more Introduction. Digital impressions in implant dentistry rely on many variables, and their accuracy, particularly in complete edentulous patients, is not well understood. Aim. The purpose of this literature review was to determine which factors may influence the accuracy of digital impressions in implant dentistry. Emphasized attention was given to the design of the intra-oral scan body (ISB) and scanning techniques. Materials and methods. A Medline, PubMed and EBSCO Host databases search, complemented by a hand search, was performed in order to select relevant reports regarding the appliance of digital impressions in implant dentistry. The search subject included but was not limited to accuracy of digital impressions in implant dentistry, digital scanning techniques, the design and material of the ISBs, and the depth and angulation of the implant. The related titles and abstracts were screened, and the remaining articles that fulfilled the inclusion criteria were selected for full-te...

Anais da XIV Conferência Brasileira sobre Qualidade da Energia Elétrica, 2021

Earth System Science Data, 2021

The Coimbra Magnetic Observatory (COI), Portugal, established in 1866, has provided nearly contin... more The Coimbra Magnetic Observatory (COI), Portugal, established in 1866, has provided nearly continuous records of the geomagnetic field elements for more than 150 years. However, during its long lifetime inevitable changes to the instruments and measurement procedures and even the relocation of the observatory have taken place. In our previous work (Morozova et al., 2014) we performed homogenization-elimination of the artificial changes-of the measured declination series (D) for the period from 1866 to 2006. In this paper we continue work on applying homogenization procedures to the measured series of the absolute monthly values of the horizontal (H , 1866-2006), vertical (Z, 1951-2006) and inclination components (I , 1866-1941). After homogenization of all measured series for the 1866-2006 time interval, we performed the homogenization of the series of all geomagnetic field elements (X, Y , Z, H , D, I and F) to the level of the 2015 epoch. Since all series except D have a gap of about 10 years in the middle of the 20th century, splitting each of them into two, the homogenization to the level of 2015 was done only for the series available after 1951 (with the D series homogenized for the whole time interval of 1866-2015). The COI geomagnetic field elements are available via the following addresses: https://doi.org/10.5281/zenodo.4308022 (Ribeiro et al., 2020) for the original COI data (ASCII and XLSX formats) and https://doi.org/10.5281/zenodo.4308036 (Morozova et al., 2020) for the homogenized COI data (ASCII and XLSX formats).

Journal of Proteomics, 2016

Click here to download high resolution image  We built and present the database CanisOme with do... more Click here to download high resolution image  We built and present the database CanisOme with dogs annotated proteome.  Proteome annotation includes quantification by disease and dog breed.  Dogs tryptase-P15944 is a marker candidate for immune response in tumoral process.  Two mechanisms of macrophage response inhibition by Leishmania are proposed. *Highlights (for review) CanisOme-The protein signatures of Canis lupus familiaris diseases

This paper presents a theoretical model for the estimation of the lineshape of lasers by the dela... more This paper presents a theoretical model for the estimation of the lineshape of lasers by the delayed self-heterodyne method, considering phase noise effects, based on [1]. Closed-forms expressions for the autocorrelation function and the power spectral density of the laser are derived, considering three cases: phase noise with low power, phase noise with medium power and phase noise with high power. The resulting expressions are valid for any optical phase noise probability distribution.

Polímeros, 2003

Um dos métodos atuais importantes para o desenvolvimento de produtos é o QFD (Quality Function De... more Um dos métodos atuais importantes para o desenvolvimento de produtos é o QFD (Quality Function Deployment ou Desdobramento da Função Qualidade). O QFD consiste em um processo sistemático para traduzir a opinião do cliente em requisitos técnicos e operacionais, mostrando e documentando as informações na forma de matrizes. O método objetiva enfocar os itens mais importantes, proporcionando um mecanismo para alcançar vantagens competitivas no processo de desenvolvimento. Este trabalho destaca o conceito do QFD, citando uma aplicação em uma empresa que produz filmes flexíveis de polipropileno (BOPP). O trabalho apresenta alguns aspectos da introdução do método na empresa, apontando as dificuldades encontradas, resultados e benefícios decorrentes da implantação. Dentre os benefícios gerados, destacam-se a importância do papel do QFD como um método para sistematizar o processo de desenvolvimento, bem como outros benefícios para a equipe, tais como melhoria nas habilidades de planejamento,...

Resources, Conservation and Recycling, 2010

Pulp mill sludge produced in the Cova da Beira region (Portugal) contains organic matter (11-47%)... more Pulp mill sludge produced in the Cova da Beira region (Portugal) contains organic matter (11-47%), nitrogen (38-2560 mg N/kg) and phosphorus (167-370 mg P/kg), which may be valuable for increasing soil productivity. The levels of heavy metals are below the limits recommended by legislation and the amount of nitrogen and phosphorous to be introduced in soils does not present a risk for nutrient leaching. After identifying the environmental and technical restrictions on its application, an area of 1650 ha was identified where the sludge can be applied in forage crops, fruit trees, olive groves and vineyards. A suitable area was also found for a biosolids storage centre. The use of GIS allowed to define a sludge application index and to produce land-use suitability maps, which can be useful for sludge management.

WIT Transactions on Ecology and the Environment, 2009

Evaluating, monitoring and informing about urban environmental quality has become a main issue, p... more Evaluating, monitoring and informing about urban environmental quality has become a main issue, particularly important when considered as a decisionmaking tool that contributes to more habitable and sustainable cities. Following a tendency observed in other European cities, the city of Braga (Portugal) has decided to create an infrastructure for environmental data acquisition and a webbased platform as a public information system. Some of the innovations introduced in this new platform include the use of mobile instrumented units, the extensive use of simulation software to create long-term pollution (air and noise) maps, and the presentation of the information through a geographical interface developed over Google Maps technology. This paper discusses some of the critical aspects regarding the conceptual design of such an information system, and presents the actual information system developed for Braga, named SmarBRAGA.

2009 3rd IEEE International Conference on E-Learning in Industrial Electronics (ICELIE), 2009

Abstract-This paper presents the design and implementation of a remote experiment for controlling... more Abstract-This paper presents the design and implementation of a remote experiment for controlling the level of a two-tank system. It describes also the management of the team work: it was performed in a remote collaborative methodology by two students of the fourth year of the Industrial ...

All Days, 2005

The 2003 Brazilian deepwater drilling record (4th in the world) was achieved with a slender well ... more The 2003 Brazilian deepwater drilling record (4th in the world) was achieved with a slender well in a 2887-meter water depth in Campos Basin (block BMC-10), Rio de Janeiro. Uncommon to the drilling practices throughout the world and, particularly, in the Brazilian coast, the well was safely drilled with a surface blowout preventer system (SBOP). Beyond the importance of a world record class, the result points out to an important paradigm shift in the current technical culture throughout the country, considering safety (human, environmental and material), economical and regulatory issues which surrounds such decision taking task. This work presents two discussions: the first one concerns the technical issues considering well control operations performed on the drilled well and on a hypothetical conventional well that could also be drilled under the same conditions. This discussion involves the calculation of pressures at the choke, at the casing and liner shoes, pit gain and produced...

Waste Management, 2008

The European Union introduced several policy instruments based in the extended producer responsib... more The European Union introduced several policy instruments based in the extended producer responsibility (EPR) in order to improve the environmental performance of products and services through their life cycles. In this context, the Portuguese government decided to apply the EPR concept to tyres, and producers were obliged to constitute an end-of-life management system to promote the collection, recycling and reuse of end-of-life (EOL) tyres. This required producers, distributors, recyclers and retreaders to be identified and characterized, and local processing infrastructures to be analyzed. The information was used to design an economically optimised EOL tyre management system while promoting the activity of all EOL operators in order for the imposed collecting and recovery targets to be fulfilled. This paper discusses the interaction between the different governmental, private and academic institutions for the creation of the integrated management system for EOL tyres, the approach taken, the technical, political and legal aspects underneath them, as well as the environmental consequences induced by the creation of the management system. The results obtained during the first years of operation are reported and show an increase in the collection and recycling of EOL tyres and the consolidation of the collection and processing infrastructures.

Journal of the American College of Cardiology, 2013

Background: Accountable care organization and high quality affordable patient care would need imp... more Background: Accountable care organization and high quality affordable patient care would need impeccable team work between primary and specialist care physicians. Hence, we evaluated factors that would prompt termination of continued collaboration between primary care physicians and consulting cardiologists. methods: One hundred three primary care doctors were interviewed and a 11 point questionnaire was compiled. The eleven potential factors for cause of termination of referrals were graded on a scale of 1 (least important) to 10 (most important). Mean scores were computed for each factor to determine the most important factors for the referring primary care physicians. results: We interviewed 84 physicians that practiced in the city and 19 in rural areas. The average years in practice for the primary care physicians was 20.9 years. The most important factors for termination of referrals in the order of diminishing importance were cardiologist's bedside manners as perceived by the patient (7.9 +2.1), poor feedback from the cardiologist (7.8 +2.3) and patients not getting their questions fully answered by the cardiologist during the visit (7.8+1.9). Less important factors were staff failing to respond to calls promptly (7.2+2.0), ease of getting an appointment (7.0 +2.3), the patient is displeased with the clinical plan (6.6 +2.3), staff friendliness (6.6 +2.5), physician promptness (5.6 +2.6), tests are not done the same day/results are not given promptly (5.6 +2.4), cardiologist keeps the patient even if there is only a minor cardiac problem (5.4 +3.0), and cardiologist is too aggressive with tests (4.9 +2.6). conclusions: The most important factors that result in termination of referrals between primary care physicians and specialist cardiologists include cardiologist's bedside manners as perceived by the patient, poor feedback from the cardiologist, and patients not getting their questions fully answered by the cardiologist during the visit.

International Journal of Risk Assessment and Management, 2009

The use of mobile phones has been the target of a great controversy due to possible biological an... more The use of mobile phones has been the target of a great controversy due to possible biological and behavioural effects. This research presents a preliminary evaluation, regarding the learning and stress levels in subjects of the species Rattus norvegicus, submitted to microwave radiation. The psychological analysis was based on laboratory tests using the aquatic maze (tank of Morris), to determine the capacity of learning and memorisation and the elevated cross maze, designed to evaluate the levels of anxiety and stress. The consumption of water and food was monitored as well as the weight of the animals. The experiments were accomplished using irradiated rats (Experimental Group), and non-irradiated rats (Control Group). No significant differences were observed in the learning or performance of the groups in the aquatic maze experiment. For the elevated cross maze tests, the subjects of the Experimental Group manifested lower stress levels.

IEEE Signal Processing Magazine, 2009

ignal processing has been used in many different applications, including electric power systems. ... more ignal processing has been used in many different applications, including electric power systems. This is an important category, since a wide variety of digital measurements is available and data analysis is required to deliver diagnostic solutions and correlation with known behaviors. Measurements are taken at numerous locations, and the analysis of data applies to a variety of issues in power quality (PQ) and reliability ■ power system and equipment diagnostics ■ power system control ■ power system protection. ■ This article focuses on problems and issues related to PQ and power system diagnostics, in particular those where signal processing techniques are extremely important. PQ is a general term that describes the quality of voltage and current waveforms. PQ problems include all electric power problems or disturbances in the supply system that prevent end-user equipment from operating properly. Examples of voltage and current variations that can result in PQ problems include voltage interruptions, long-and short-duration voltage variations, steady-state [ Assessing power system quality using signal processing techniques ]

European Transactions on Electrical Power, 2010

This paper outlines a number of possible research directions in power quality. The introduction o... more This paper outlines a number of possible research directions in power quality. The introduction of new sources of generation will introduce the need for new research on voltage-magnitude variations, harmonic emission and harmonic resonance. Statistical performance indicators are expected to play an important role in addressing the hosting capacity of the power system for these new sources. The quickly growing amounts of power-quality data call for automatic analysis methods. Advanced signal-processing tools need to be developed and applied to address this challenge. Equipment with an active power-electronic interface generates waveform distortion at higher frequencies than existing equipment. The emission, spread, consequences and mitigation of this distortion require more research emphasis. The growing complexity of the power system calls for remote identification of system events and load transitions. Future DC networks, at different voltage levels, require the research on DC power quality next to AC power quality. Research on methods to describe and analyse time-varying harmonics has applications in a number of the above-mentioned issues. So does the use of hardware-in-the-loop (HIL) and real-time-digital simulation. Existing power quality standards should not form a barrier against future research; instead research should result in improved standards as well as completely new concepts. Examples are: voltage dips in three-phase systems, flicker due to non-incandescent lamps, and voltage variations on the timescale between 1 second and 10 minutes. All together, it is concluded in this paper that sufficient important and interesting research challenges and opportunities remain in the power quality area.