1,111 research outputs found
VI Workshop on Computational Data Analysis and Numerical Methods: Book of Abstracts
The VI Workshop on Computational Data Analysis and Numerical Methods (WCDANM) is going to be held on June 27-29, 2019, in the Department of Mathematics of the University of Beira Interior (UBI), Covilhã, Portugal and it is a unique opportunity to disseminate scientific research related to the areas of Mathematics in general, with particular relevance to the areas of Computational Data Analysis and Numerical Methods in theoretical and/or practical field, using new techniques, giving especial emphasis to applications in Medicine, Biology, Biotechnology, Engineering, Industry, Environmental Sciences, Finance, Insurance, Management and Administration. The meeting will provide a forum for discussion and debate of ideas with interest to the scientific community in general. With this meeting new scientific collaborations among colleagues, namely new collaborations in Masters and PhD projects are expected. The event is open to the entire scientific community (with or without communication/poster)
Instability in spatial evolutionary games
We investigate the aspects that influence the instability of
spatial evolutionary games, namely the Prisoner's Dilemma and the
Snowdrift games. In this paper instability is defined as the proportion of
strategy changes in the asymptotic period of the evolutionary process.
The results show that with the Prisoner's Dilemma, when the level of
noise present in the decision process is very low, the instability decreases
as the synchrony rate decreases. With the Snowdrift this pattern of behavior
depends strongly on the interaction topology and arises only for
random and scale-free networks. However, for large noise values, the instability
in both games depends only on the proportion of cooperators
present in the population: it increases as the proportion of cooperators
approaches 0.5. We advance an explanation for this behavior
Multinomial logistic regression in worker’s health
In European countries, namely in Portugal, it is common to hear some people mentioning that they are exposed to excessive and continuous psychosocial stressors at work. This is increasing in diverse activity sectors, such as, the Services sector. A representative sample was collected from a Portuguese Services’ organization, by applying a survey (internationally validated), which variables were measured in five ordered categories in Likert-type scale. A multinomial logistic regression model is used to estimate the probability of each category of the dependent variable general health perception where, among other independent variables, burnout appear as statistically significant
Waste marble dust blended cement
Marble processing activities generates a.significant amount of waste in dust form. This waste, which is nowadays one of the environmental problems worldwide, presents great potential of being used as mineral addition in blended cements production. This paper shows preliminary results of an ongoing project which ultimate goal is to investigate the viability of using waste marble dust (WMD), produced by marble Portuguese industry, as cement replacement material. In order to evaluate the effects of the WMD on mechanical behaviour, different mortar blended cement mixtures were tested. These mixtures were prepared with different partial substitution level of cement with WMD. Strength results of WMD blended cements were compared to control cements with same level of incorporation of natural limestone used to produce commercial Portland-limestone cements. The results obtained show that WMD blended cements perform better than limestone blended cements for same replacement level up to 20% w/w. Therefore, WMD reveals promising attributes for blended cements production
Carbapenemase-producing Enterobacteriaceae in a Portuguese hospital - a five-year retrospective study
Our hospital experienced an outbreak of OXA-48-producing Enterobacteriaceae, triggering this study. We aimed to describe the population with carbapenemase-producing Enterobacteriaceae (CPE) in our hospital from 2014 to 2018, the phenotypic and genotypic characteristics of isolates, and strategies to stop the outbreak.info:eu-repo/semantics/publishedVersio
Rate adaptation for wireless video streaming based on error statistics
This paper presents a new rate-control algorithm for live video streaming over wireless IP networks, which is based on selective frame discarding. In the proposed mechanism excess 'P' frames are dropped from the output queue at the sender using a congestion estimate based on packet loss statistics obtained from RTCP feedback and from the Data Link (DL) layer. The performance of the algorithm is evaluated through computer simulation. This paper also presents a characterisation of packet losses owing to transmission errors and congestion, which can help in choosing appropriate strategies to maximise the video quality experienced by the end user. Copyright © 2007 Inderscience Enterprises Ltd
Mammals in Portugal: A data set of terrestrial, volant, and marine mammal occurrences in Portugal
Open Research: The complete data set is available as Supporting Information and are also
available in Figshare at https://doi.org/10.6084/m9.figshare.14938437Mammals are threatened worldwide, with ca. 26% of all species being
included in the IUCN threatened categories. This overall pattern is primarily associated to
habitat loss or degradation, and human persecution for terrestrial mammals, and pollution,
open net fishing, climate change and prey depletion for marine mammals. Mammals play
a key role in maintaining ecosystems functionality and resilience, and therefore
information on their distribution is crucial to delineate and support conservation actions.
MAMMALS IN PORTUGAL is a publicly available data set compiling unpublished georeferenced
occurrence records of 92 terrestrial, volant, and marine mammals in mainland
Portugal and archipelagos of Azores and Madeira that includes 107,852 data entries
between 1873 and 2021 (72% of the data occurring in 2000 and 2021). The methods used
to collect the data were: live observations/captures (42%), sign surveys (38%), camera
trapping (16%), bioacoustics surveys (4%) and radio-tracking and inquiries that represent
less than 1% of the records. The data set includes 13 types of records: 1) burrows | soil
mounds | tunnel, 2) capture, 3) colony, 4) dead animal | hair | skulls | jaws, 5) genetic
confirmation, 6) inquiries, 7) observation of live animal, 8), observation in shelters, 9)
photo trapping | video, 10), predators diet | pellets | pine cones/nuts, 11) scat | track | ditch,
12) telemetry and 13) vocalization | echolocation. The spatial uncertainty of most records ranges between 0 and 100 m (76%). Rodentia (n = 34,754) has the highest number of
records followed by Chiroptera (n = 18,858), Carnivora (n = 18,594), Lagomorpha (n =
17,679), Cetartiodactyla (n = 11,568) and Eulipotyphla (n = 6,400). The data set includes
records of species classified by the IUCN as threatened (e.g., Oryctolagus cuniculus (n =
12,407), Monachus monachus (n = 1512), and Lynx pardinus (n = 197)]. We believe that
this data set may stimulate the publication of other European countries data sets which
would certainly contribute to ecology and conservation-related research, and therefore
assisting on the development of more accurate and tailored conservation management
strategies for each species. There are no copyright restrictions; please cite this data paper
when the data are used in publicationsinfo:eu-repo/semantics/acceptedVersio
Influence of the particle size and animal slurry type on the potential of nitrogen mineralization after soil incorporation
RAMIRAN International ConferenceAnimal manures are rich in organic matter and nutrients, namely nitrogen (N) and, consequently, widely applied to
soil as organic fertilizers. However, a large part of the nitrogen contained in animal manures is in the organic form
and so not directly available for plants. Indeed, organic N has to be mineralized prior to plant uptake (Rees and
Castle, 2002). Several manure characteristics as the C:N ratio (Chadwick et al., 2000), the lignin content
(Kristensen, 1996) and the NH4 +/organic N ratio (Beauchamp and Paul, 1989) have been suggested as indicators of
the plant-available N. More recently, Fangueiro et al. (2008) showed that the potential of N mineralization (PNM) of
cattle slurry is inversely correlated with slurry particle size: finest fractions are the particle-size fractions from which
N mineralization occurs in slurries whereas coarser fractions are associated with immobilization. Furthermore,
Moller et al. (2002) reported that animal diet and anaerobic decomposition during storage in slurry channels and
stores affect the slurry particle size distribution. Such information is of great interest since the finest slurry particle
size should infiltrate the soil more easily and quickly relative to the coarser slurry particle size that should remain
close to soil surface. Furthermore, mechanical slurry separation is now performed in many pig and dairy farms in
order to improve slurry management in terms of nutrients utilization and reducing costs related to slurry storage.
Slurry separation by screw press leads to a nutrient rich organic solid fraction (0.7– 3.2 mm particles) that may be
composted and a liquid fraction that can be used for fertigation.
In the present study, three types of slurry (pig, duck and cattle) were separated into 4 slurry particle size
fractions (>2000 um, 2000-500 um, 500-100 um, <100 um) in order to assess the influence of the type of slurry and
slurry particle size on the PNM after soil incorporation
mHealth Applications to Monitor Lifestyle Behaviors and Circadian Rhythm in Clinical Settings: Current Perspective and Future Directions
Metabolic diseases are a global rising health burden, mainly due to the deleterious interaction of current lifestyles with the underlying biology of these diseases. Daily habits and behaviors, such as diet, sleep, and physical exercise impact the whole-body circadian system through the synchronization of the peripheral body clocks that contribute to metabolic homeostasis. The disruption of this system may promote the development of metabolic diseases, including obesity and diabetes, emphasizing the importance of assessing and monitoring variables that affect circadian rhythms. Advances in technology are generating innovative resources and tools for health care management and patient monitoring, particularly important for chronic conditions. The use of mobile health technologies, known as mHealth, is increasing and these approaches are contributing to aiding both patients and healthcare professionals in disease management and education. The mHealth solutions allow continuous monitoring of patients, sharing relevant information and data with physicians and other healthcare professionals and accessing education resources to support informed decisions. Thus, if properly used, these tools empower patients and help them to adopt healthier lifestyles. This article aims to give an overview of the influence of circadian rhythms disruption and lifestyle habits in the progression of metabolic diseases while also reviewing some of the mobile applications available to monitor lifestyle behaviors and individual chronobiology. Herein is also described the design and development of the NutriClock system, an mHealth solution developed by our team to monitor these variables
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