963 results on '"Dionísio, P"'
Search Results
2. Numerical integration rules based on B-spline bases
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Yáñez, Dionisio F.
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Mathematics - Numerical Analysis - Abstract
In this work, we present some new integration formulas for any order of accuracy as an application of the B-spline relations obtained in [1]. The resulting rules are defined as a perturbation of the trapezoidal integration method. We prove the order of approximation and extend the results to several dimensions. Finally, some numerical experiments are performed in order to check the theoretical results.
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- 2024
3. A non-separable progressive multivariate WENO-$2r$ point value
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Mulet, Pep, Ruiz-Alvarez, Juan, Shu, Chi-Wang, and Yáñez, Dionisio F.
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Mathematics - Numerical Analysis - Abstract
The weighted essentially non-oscillatory {technique} using a stencil of $2r$ points (WENO-$2r$) is an interpolatory method that consists in obtaining a higher approximation order from the non-linear combination of interpolants of $r+1$ nodes. The result is an interpolant of order $2r$ at the smooth parts and order $r+1$ when an isolated discontinuity falls at any grid interval of the large stencil except at the central one. Recently, a new WENO method based on Aitken-Neville's algorithm has been designed for interpolation of equally spaced data at the mid-points and presents progressive order of accuracy close to discontinuities. This paper is devoted to constructing a general progressive WENO method for non-necessarily uniformly spaced data and several variables interpolating in any point of the central interval. Also, we provide explicit formulas for linear and non-linear weights and prove the order obtained. Finally, some numerical experiments are presented to check the theoretical results.
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- 2024
4. Abelian Chern-Simons vortices in the presence of magnetic impurities
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Bazeia, Dionisio, Campos, João G. F., and Mohammadi, Azadeh
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High Energy Physics - Theory ,Nonlinear Sciences - Pattern Formation and Solitons - Abstract
This work deals with Abelian Chern-Simons vortices interacting with magnetic impurities. We compute static solutions with winding numbers zero and one. Then, we develop a numerical algorithm to simulate their collisions. Collisions between a vortex with winding number two and a magnetic impurity are also performed. All scattering results are interpreted in terms of the moduli space approximation and compared with the Abelian Maxwell-Higgs model.
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- 2024
5. Integrated Microstrip Patch Antenna with a Frequency-Selective Surface Utilizing Hospital Textile Materials for Reduced Specific Absorption Rate in Wearable Wireless Communication Systems
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Sousa, Matheus Emanuel Tavares, de Andrade Lira, Ruann Víctor, da Silva, Isaac Barros Tavares, de Andrade, Humberto Dionísio, Assis Brito Filho, Francisco de, and de Siqueira Campos, Antonio Luiz Pereira
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- 2024
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6. The SCIP Optimization Suite 9.0
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Bolusani, Suresh, Besançon, Mathieu, Bestuzheva, Ksenia, Chmiela, Antonia, Dionísio, João, Donkiewicz, Tim, van Doornmalen, Jasper, Eifler, Leon, Ghannam, Mohammed, Gleixner, Ambros, Graczyk, Christoph, Halbig, Katrin, Hedtke, Ivo, Hoen, Alexander, Hojny, Christopher, van der Hulst, Rolf, Kamp, Dominik, Koch, Thorsten, Kofler, Kevin, Lentz, Jurgen, Manns, Julian, Mexi, Gioni, Mühmer, Erik, Pfetsch, Marc E., Schlösser, Franziska, Serrano, Felipe, Shinano, Yuji, Turner, Mark, Vigerske, Stefan, Weninger, Dieter, and Xu, Lixing
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Mathematics - Optimization and Control ,90C05, 90C10, 90C11, 90C30, 90C90, 65Y05 - Abstract
The SCIP Optimization Suite provides a collection of software packages for mathematical optimization, centered around the constraint integer programming (CIP) framework SCIP. This report discusses the enhancements and extensions included in the SCIP Optimization Suite 9.0. The updates in SCIP 9.0 include improved symmetry handling, additions and improvements of nonlinear handlers and primal heuristics, a new cut generator and two new cut selection schemes, a new branching rule, a new LP interface, and several bug fixes. The SCIP Optimization Suite 9.0 also features new Rust and C++ interfaces for SCIP, new Python interface for SoPlex, along with enhancements to existing interfaces. The SCIP Optimization Suite 9.0 also includes new and improved features in the LP solver SoPlex, the presolving library PaPILO, the parallel framework UG, the decomposition framework GCG, and the SCIP extension SCIP-SDP. These additions and enhancements have resulted in an overall performance improvement of SCIP in terms of solving time, number of nodes in the branch-and-bound tree, as well as the reliability of the solver., Comment: The release report of the SCIP Optimization Suite version 9.0
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- 2024
7. A note on some bounds between cubic spline interpolants depending on the boundary conditions: Application to a monotonicity property
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Baeza, Antonio and Yáñez, Dionisio F.
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Mathematics - Numerical Analysis - Abstract
In the context of cubic splines, the authors have contributed to a recent paper dealing with the computation of nonlinear derivatives at the interior nodes so that monotonicity is enforced while keeping the order of approximation of the spline as high as possible. During the review process of that paper, one of the reviewers raised the question of whether a cubic spline interpolating monotone data could be forced to preserve monotonicity by imposing suitable values of the first derivative at the endpoints. Albeit a negative answer appears to be intuitive, we have found no results regarding this fact. In this short work we prove that the answer to that question is actually negative.
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- 2024
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8. GAMPix: a novel fine-grained, low-noise and ultra-low power pixelated charge readout for TPCs
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Shutt, Tom, Trbalic, Bahrudin, Pena-Perez, Aldo, Luitz, Steffen, Convery, Mark, Dragone, Angelo, Rota, Lorenzo, Freytag, Dietrich R., Doering, Dionisio, Mele, Filippo, Moore, Miriam, Tanaka, Hiro, and Tsai, Yun-Tse
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Physics - Instrumentation and Detectors ,Astrophysics - Instrumentation and Methods for Astrophysics ,High Energy Physics - Experiment - Abstract
We report on the development of a novel pixel charge readout system, Grid Activated Multi-scale pixel readout (GAMPix), which is under development for use in the GammaTPC gamma ray instrument concept. GammaTPC is being developed to optimize the use of liquid argon time projection chamber technology for gamma ray astrophysics, for which a fine grained low power charge readout is essential. GAMPix uses a new architecture with coarse and fine scale instrumented electrodes to solve the twin problems of loss of measured charge after diffusion, and high readout power. Fundamentally, it enables low noise and ultra low power charge readout at the spatial scale limited by diffusion in a time projection chamber, and has other possibly applications, including future DUNE modules., Comment: 23 pages, 18 figures
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- 2024
9. Impact on silk synthesis resulting from whey protein supplementation and hydration in silkworm diet, Bombyx mori (Lepidoptera: Bombycidae)
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Aguiar, Rachel Colauto Milanezi, Lopes, Thayná Bisson Ferraz, Pezenti, Larissa Forim, Dionísio, Jaqueline Fernanda, Lepri, Sandra Regina, Mantovani, Mário Sergio, Levy, Sheila Michele, Nascimento, Cristianne Cordeiro, Amano, Renata, and da Rosa, Renata
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- 2024
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10. Malignant melanoma in Portuguese adult population: a scoping review of the real-world evidence
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Gouveia, Emanuel, de Sousa, Rita Teixeira, Aguiar, Sandra I., Gírio, Ana, Costa, Inês, Dionísio, Maria Rita, and Moital, Inês
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- 2024
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11. Subdivision schemes based on weighted local polynomial regression. A new technique for the convergence analysis
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López-Ureña, Sergio and Yáñez, Dionisio F.
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Mathematics - Numerical Analysis - Abstract
The generation of curves and surfaces from given data is a well-known problem in Computer-Aided Design that can be approached using subdivision schemes. They are powerful tools that allow obtaining new data from the initial one by means of simple calculations. However, in some applications, the collected data are given with noise and most of schemes are not adequate to process them. In this paper, we present some new families of binary univariate linear subdivision schemes using weighted local polynomial regression. We study their properties, such as convergence, monotonicity, polynomial reproduction and approximation and denoising capabilities. For the convergence study, we develop some new theoretical results. Finally, some examples are presented to confirm the proven properties.
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- 2023
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12. Experimental investigation on the moisture movement behavior of granites
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Nazerigivi, Amin, Ghiassi, Bahman, Dionísio, Amélia, and Vasconcelos, Graça
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- 2024
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13. Developing a Gamified Digital Platform to Promote Extracurricular Activities in Basic and Secondary Schools -- Preliminary Findings
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Ana Raquel Carvalho, Laura Ferreira, Lara Gonçalves, Carlos Santos, João Almeida, Nuno Ribeiro, Miguel Filipe, João Brandão, Samuel Santos, Catarina Dionísio, and L. Pedro
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Designing learning solutions in digitally mediated contexts requires attention to the level of immersion, interactivity, personalization, and engagement promoted, to which the incorporation of active learning methods and gamified strategies can be strategic. However, more research is needed on how teachers use technology-enhanced active learning strategies and on the impact of game-design elements inclusion in learning environments. This study provides findings from the informed exploration stage of a project, consisting of the development and assessment of a digital platform to be used in Portuguese basic and secondary schools to support participation in extracurricular projects and promote its users' sense of belonging. A survey by questionnaire was publicly shared with Portuguese schoolteachers, in June 2022, to map the current technological reality in Portuguese schools and teachers' relationship with technologies. 215 valid responses were analysed with descriptive statistics and content analysis. The use of digital technologies was found not to have decreased after the emergency remote learning period. Teachers assumed that the most used platforms coincided with those institutionally supported and that combining the promotion of active learning methods and the formal recognition of learners' attitudes and skills in a digital solution was something innovative and required in Portuguese schools.
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- 2024
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14. Non-linear WENO B-spline based approximation method
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Amat, Sergio, Levin, David, Ruiz-Álvarez, Juan, and Yáñez, Dionisio F.
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Mathematics - Numerical Analysis - Abstract
In this work we present a new WENO b-spline based quasi-interpolation algorithm. The novelty of this construction resides in the application of the WENO weights to the b-spline functions, that are a partition of unity, instead to the coefficients that multiply the b-spline functions of the spline. The result obtained conserves the smoothness of the original spline and presents adaption to discontinuities in the function. Another new idea that we introduce in this work is the use of different base weight functions from those proposed in classical WENO algorithms. Apart from introducing the construction of the new algorithms, we present theoretical results regarding the order of accuracy obtained at smooth zones and close to the discontinuity, as well as theoretical considerations about how to design the new weight functions. Through a tensor product strategy, we extend our results to several dimensions. In order to check the theoretical results obtained, we present an extended battery of numerical experiments in one, two and tree dimensions that support our conclussions.
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- 2023
15. Multiple Fault Diagnosis in a Wind Turbine Gearbox with Autoencoder Data Augmentation and KPCA Dimension Reduction
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Felix, Leonardo Oldani, de Sá Só Martins, Dionísio Henrique Carvalho, Monteiro, Ulisses Admar Barbosa Vicente, Pinto, Luiz Antonio Vaz, Tarrataca, Luís, and Martins, Carlos Alfredo Orfão
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- 2024
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16. Neural underpinnings of ethical decisions in life and death dilemmas in naïve and expert firefighters
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Duarte, Isabel C., Dionísio, Ana, Oliveira, Joana, Simões, Marco, Correia, Rita, Dias, Joana A., Caldeira, Salomé, Redondo, João, and Castelo-Branco, Miguel
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- 2024
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17. Neurochemical differences in core regions of the autistic brain: a multivoxel 1H-MRS study in children
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Dionísio, Ana, Espírito, Ana, Pereira, Andreia C., Mouga, Susana, d’Almeida, Otília C., Oliveira, Guiomar, and Castelo-Branco, Miguel
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- 2024
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18. Kink-antikink collisions in the $\phi^8$ model: short-range to long-range journey
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Bazeia, Dionisio, Campos, João G. F., and Mohammadi, Azadeh
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High Energy Physics - Theory ,Nonlinear Sciences - Pattern Formation and Solitons - Abstract
We studied kink-antikink collisions in (1+1)-dimensional spacetime for all $Z_2$ symmetric $\phi^8$ models with four degenerate minima. Such a polynomial model has only one free parameter, allowing us to conduct an exhaustive analysis. We performed detailed simulations in all three sectors of the model. We observed resonance windows from both localized and delocalized modes, as well as a sector change with the formation of additional kink-antikink pairs. Furthermore, we were able to show how collisions are modified when two quadratic minima merge into a quartic one, causing the kinks to acquire a long-range character. We demonstrated that when the tail not facing the opposing kink is long-range, incoming kinks and antikinks decay directly into radiation, as suggested in \cite{campos2021interaction}, by forming a large number of small kink-antikink pairs. Finally, we briefly discussed whether our analysis could be generalized to other polynomial models.
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- 2023
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19. Neural underpinnings of ethical decisions in life and death dilemmas in naïve and expert firefighters
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Isabel C. Duarte, Ana Dionísio, Joana Oliveira, Marco Simões, Rita Correia, Joana A. Dias, Salomé Caldeira, João Redondo, and Miguel Castelo-Branco
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Medicine ,Science - Abstract
Abstract When a single choice impacts on life outcomes, faculties to make ethical judgments come into play. Here we studied decisions in a real-life setting involving life-and-death outcomes that affect others and the decision-maker as well. We chose a genuine situation where prior training and expertise play a role: firefighting in life-threatening situations. By studying the neural correlates of dilemmas involving life-saving decisions, using realistic firefighting situations, allowed us to go beyond previously used hypothetical dilemmas, while addressing the role of expertise and the use of coping strategies (n = 47). We asked the question whether the neural underpinnings of deontologically based decisions are affected by expertise. These realistic life-saving dilemmas activate the same core reward and affective processing network, in particular the ventromedial prefrontal cortex, nucleus accumbens and amygdala, irrespective of prior expertise, thereby supporting general domain theories of ethical decision-making. We found that brain activity in the hippocampus and insula parametrically increased as the risk increased. Connectivity analysis showed a larger directed influence of the insula on circuits related to action selection in non-experts, which were slower than experts in non rescuing decisions. Relative neural activity related to the decision to rescue or not, in the caudate nucleus, insula and anterior cingulate cortex was negatively associated with coping strategies, in experts (firefighters) suggesting practice-based learning. This shows an association between activity and expert-related usage of coping strategies. Expertise enables salience network activation as a function of behavioural coping dimensions, with a distinct connectivity profile when facing life-rescuing dilemmas.
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- 2024
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20. European Cities of Sport as a Strategic Policy for Local Development of Sports: A Perspective from Sports Management in the Last Decade
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Teixeira Mário Coelho, Mamede Nuno Brito, Seguí-Urbaneja Jordi, and Sesinando André Dionísio
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europe ,sports management ,physical activity participation ,development through sport ,sports participation ,Sports ,GV557-1198.995 - Abstract
European sports policies have focused on the implementation of public instruments and policy measures, aiming to encourage EU member states to promote and improve sports habits, while simultaneously tackling high levels of sedentary lifestyle among Europeans. Despite these efforts, data concerning the various measures is quite limited, making it impossible to assess the real impact on the population, particularly in the case of the European Cities of Sport. This award has been held since 2007 and has already distinguished 193 cities; however, current knowledge does not allow researchers to theorise about its multiple impacts as a strategic policy instrument for the local development of sport in Europe, thus constituting a gap within sports management research. In order to further this knowledge, we explored European reality over a decade (2013–2022), analysing nine awards of Portuguese cities. We employed qualitative methods for documentary analysis of public information and descriptive statistics for data analysis. The results show that over 2 600 multidisciplinary events were organised, among which 402 had an international character (15%), an average of 50 sports disciplines per edition, 359 events related to culture and education, and involved over 1 000 000 participants, with an overall investment of over €39 million. This research now allows a theoretical-scientific and operational referential pattern of key indicators to be established for future European ECS applications, while demonstrating an encouraging relationship, from a sports perspective and economically, between public investment made and estimated return, thus contributing to better political decisions and to the positive implications of increasing public investment in sport.
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- 2024
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21. Influence of the Pandeiros Small Hydroelectric Plant reservoir on the concentration and composition of solids transported by the Pandeiros River, Brazil
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de Oliveira, Jonas Faria Dionísio, Coelho, Gilberto, and Carvalho, Ronan Naves
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- 2024
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22. Human visceral leishmaniasis and polymorphisms in interleukin-coding genes: a systematic review
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Amanda Virginia Batista Vieira, Manuela Rocha de Menezes, Pablo Cantalice Santos Farias, Elis Dionísio da Silva, Gilberto Silva Nunes Bezerra, Walter Lins Barbosa Júnior, and Zulma Maria de Medeiros
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Kala-azar ,Visceral leishmaniasis ,Leishmania sp. ,Single base polymorphism ,Systematic review ,Arctic medicine. Tropical medicine ,RC955-962 ,Toxicology. Poisons ,RA1190-1270 ,Zoology ,QL1-991 - Abstract
ABSTRACT Visceral leishmaniasis (VL) is a neglected disease that is typical of tropical and subtropical parts of the world and is caused by the trypanosomatid Leishmania donovani complex. This disease is a multifactorial condition that involves parasitic, environmental, and immunogenetic characteristics. Genetic changes in genes encoding cytokines may be associated with changes in their expression and, consequently, with the development of clinical resistance or susceptibility to the disease. This systematic review and meta-analysis aimed to assess whether single nucleotide polymorphisms (SNPs) in interleukin genes influence the clinical consequences of visceral leishmaniasis infection. To this end, we carried out a systematic review and meta-analysis with structured searches in the EMBASE, PubMed, Scopus, SciELO, and Web of Science databases without time restrictions. Two independent reviewers examined the studies, performed data extraction, and assessed quality by assigning scores. If there were any discrepancies, a third reviewer with more experience was consulted. After the screening process, 28 articles were included in the systematic review and 9 in the final analysis of the meta-analysis. Statistical analyses were carried out using various genetic models. The odds ratio (OR) and corresponding 95% confidence intervals (CIs) were calculated to estimate the associations. Overall, the main clinical outcomes were classified as not associated or associated when they presented susceptibility, resistance, risk, or protective factors for the development of the disease. Associations between IFN-γ +874T/A polymorphisms in the dominant model (OR 1.64, 95% CI 1.13-2.38, I2 = 0%, p < 0.01) and heterozygous model (OR 1.72, 95% CI 1.15-2.57, I2 = 0%, p < 0.01) and IL-18 -137G/C in the recessive model (OR 1.33, 95% CI 1.02-1.71, I2 = 9%, p = 0.03) and VL were observed. For the IL-10 gene SNPs, there was no significant association. Our findings suggest that SNPs in the IFN-γ and IL-18 genes may be associated with the risk of developing VL.
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- 2024
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23. The Yacon FOS-rich syrup: Characterization, formulation into a coating with prebiotic potential, and application on minimally processed melon
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Débora Samara Oliveira e Silva, Maria Irisdara Almeida Gomes, Lorena Maria Freire Sampaio, Ana Paula Dionísio, Adriano Lincoln Albuquerque Mattos, Aline Gonzaga Cunha, Luciana Siqueira Oliveira, Maria Izabel Gallão, Thatyane Vidal Fonteles, Sueli Rodrigues, and Maria Raquel Alcântara de Miranda
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Functional foods ,Antioxidants ,Fructooligosaccharides ,Bioavailability ,Edible films ,Shelf life ,Nutrition. Foods and food supply ,TX341-641 - Abstract
Abstract This research aimed to characterize the syrup from Yacon (Smallanthus sonchifolius (Poepp.) H. Rob.) roots as a rich source of prebiotic fructooligosaccharide (FOS) and, thus, to formulate and characterize a gelatin-based coating enriched with Yacon syrup and to apply this coating on minimally processed melons. Then, the minimally processed melons were stored for 6 days at 10 °C and they were evaluated regarding their storage potential through quality, sensory and microbiological attributes, and bioavailability of FOS. Yacon syrup presents 17.22% of FOS, high antioxidant ferric reducing oxidant power (FRAP) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) activities, 60.88% of sugars, 66.25% of carbohydrates, 2,148.1 µg kg−1 of chlorogenic acid, and 13,897.2 µg gallic acid kg−1 of phenolic contents. The incorporation of 10% Yacon syrup in the gelatin matrix increased coating thickness, accentuated the yellow color, increased the hydrophilic character, and lowered moisture. Yacon syrup-enriched gelatin matrix coating preserved the postharvest quality of minimally processed melon for 5 days at 10 °C with increased functional properties due to FOS bioavailability and higher total phenolic and carotenoid contents.
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- 2024
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24. Production of Oligosaccharides from Pine Nut Shells by Autohydrolysis
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Torrado, Ivone, Dionísio, Ana, Fernandes, Maria C., Roseiro, Luísa Bivar, Carvalheiro, Florbela, Pereira, Helena, and Duarte, Luís C.
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- 2023
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25. Resonance mediated by fermions in kink-antikink collisions
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Bazeia, Dionisio, Campos, João G. F., and Mohammadi, Azadeh
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High Energy Physics - Theory ,Nonlinear Sciences - Pattern Formation and Solitons - Abstract
We investigate generalizations of the $\phi^4$ and sine-Gordon models, including interactions with Dirac Fermions. We observe new resonance phenomena by taking the fermion back-reaction into account. First, we show that the vibrational mode responsible for the resonance structure of the $\phi^4$ model has the same frequency as the energy of the fermion excited state when the back-reaction becomes more significant. Second, we consider the sine-Gordon model with the addition of a fermion field and find that a resonant structure appears, despite the absence of a scalar vibrational mode. The vibrational frequency of the mode responsible for the exchange mechanism is again the energy of the fermion excited state. Therefore, we find a new type of resonant energy exchange mechanism which is mediated by fermions., Comment: Accepted for publication in JHEP
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- 2022
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26. Impact of streptozotocin-induced diabetes on experimental masseter pain in rats
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Yuri Martins COSTA, Clarissa Carolina Fernandes HERCULIANI, Flávia Fonseca Carvalho SOARES, Michelle de Campos Soriani AZEVEDO, Paulo César Rodrigues CONTI, Thiago José DIONÍSIO, Gabriela de Moraes OLIVEIRA, Flávio Augusto Cardoso de FARIA, Carlos Ferreira SANTOS, Gustavo Pompermaier GARLET, and Leonardo Rigoldi BONJARDIM
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Diabetes Mellitus ,Diabetic Neuropathies ,Nociception ,Masseter Muscle ,Pain ,Dentistry ,RK1-715 - Abstract
Abstract This study aimed to assess the influence of streptozotocin (STZ)-induced diabetes on the nociceptive behavior evoked by the injection of hypertonic saline (HS) into the masseter muscle of rats. Forty male rats were equally divided into four groups: a) isotonic saline control, which received 0.9% isotonic saline (IS), (Ctrl-IS); b) hypertonic saline control, which received 5% HS (Ctrl-HS); c) STZ-induced diabetic, which received IS, (STZ-IS); d) STZ-induced diabetic, which received HS (STZ-HS). Experimental diabetes was induced by a single intraperitoneal injection of STZ at dose of 60 mg/kg dissolved in 0.1 M citrate buffer, and 100 μL of HS or IS were injected into the left masseter to measure the nociceptive behavior. Later on, muscle RNA was extracted to measure the relative expression of the following cytokines: cyclooxygenase-2 (COX-2), tumor necrosis factor (TNF-α), and interleukins (IL)-1β, -2, -6, and -10. One-way analysis of variance (ANOVA) was applied to the data (p < 0.050). We observed a main effect of group on the nociceptive response (ANOVA: F = 11.60, p < 0.001), where the Ctrl-HS group presented the highest response (p < 0.001). However, nociceptive response was similar among the Ctrl-IS, STZ-IS, and STZ-HS group (p > 0.050). In addition, the highest relative gene expression of TNF-α and IL-6 was found in the masseter of control rats following experimental muscle pain (p < 0.050). In conclusion, the loss of somatosensory function can be observed in deep orofacial tissues of STZ-induced diabetic rats.
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- 2024
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27. Cashew nut (Anacardium occidentale L.) and cashew nut oil reduce cardiovascular risk factors in adults on weight-loss treatment: a randomized controlled three-arm trial (Brazilian Nuts Study)
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Talitha Silva Meneguelli, Ana Claudia Pelissari Kravchychyn, Aline Lage Wendling, Ana Paula Dionísio, Josefina Bressan, Hercia Stampini Duarte Martino, Elad Tako, and Helen Hermana Miranda Hermsdorff
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clinical trial ,cashew nut ,Anacardium occidentale L. ,obesity ,body fat ,cardiometabolic markers ,Nutrition. Foods and food supply ,TX341-641 - Abstract
IntroductionCashew nut contains bioactive compounds that modulate satiety and food intake, but its effects on body fat during energy restriction remains unknown. This study aimed to assess the effects of cashew nut and cashew nut oil on body fat (primary outcome) as well as adiposity, cardiometabolic and liver function markers (secondary outcomes).Materials and methodsAn eight-week (8-wk) randomized controlled-feeding study involved 68 adults with overweight/obesity (40 women, BMI: 33 ± 4 kg/m2). Participants were randomly assigned to one of the energy-restricted (−500 kcal/d) groups: control (CT, free-nuts), cashew nut (CN, 30 g/d), or cashew nut oil (OL, 30 mL/d). Body weight, body composition, and blood collection were assessed at the baseline and endpoint of the study.ResultsAfter 8-wk, all groups reduced significantly body fat (CT: −3.1 ± 2.8 kg; CN: −3.3 ± 2.7 kg; OL: −1.8 ± 2.6 kg), body weight (CT: −4.2 ± 3.8 kg; CN: −3.9 ± 3.1 kg; OL: −3.4 ± 2.4 kg), waist (CT: −5.1 ± 4.6 cm; CN: −3.9 ± 3.9 cm; OL: −3.7 ± 5.3 cm) and hip circumferences (CT: −2.9 ± 3.0 cm; CN: −2.7 ± 3.1 cm; OL: −2.9 ± 2.3 cm). CN-group reduced liver enzymes (AST: −3.1 ± 5.3 U/L; ALT: −6.0 ± 9.9 U/L), while the OL-group reduced LDL-c (−11.5 ± 21.8 mg/dL) and atherogenic index (−0.2 ± 0.5). Both intervention groups decreased neck circumference (CN: −1.0 ± 1.2 cm; OL: −0.5 ± 1.2 cm) and apo B (CN: −6.6 ± 10.7 mg/dL; OL: −7.0 ± 15.3 mg/dL).ConclusionAfter an 8-wk energy-restricted intervention, all groups reduced body fat (kg), weight, and some others adiposity indicators, with no different effect of cashew nut or cashew nut oil. However, participants in the intervention groups experienced additional reductions in atherogenic marker, liver function biomarkers, and cardiovascular risk factors (neck circumference and apo B levels), with these effects observed across the OL group, CN group, and both intervention groups, respectively.Clinical trial registration:https://ensaiosclinicos.gov.br/rg/RBR-8xzkyp2, identifier 8xzkyp2.
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- 2024
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28. Determination of suspended sediment rating curve and models to estimate the suspended solids concentration in the Pandeiros river, Brazil
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Jonas Faria Dionísio de Oliveira, Gilberto Coelho, and Ronan Naves Carvalho
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Water resources ,Sediments ,Hydrosedimentology ,Pandeiros river ,Sediment rating curve ,Technology ,Hydraulic engineering ,TC1-978 ,River, lake, and water-supply engineering (General) ,TC401-506 ,Geography. Anthropology. Recreation ,Environmental sciences ,GE1-350 - Abstract
ABSTRACT The present study aimed to fit the sediment rating curves in three sampling points of the Pandeiros River (Brazil), as well as to establish models for estimating the suspended solids concentration using the flow and turbidity data. The study used data measured between May 2019 and January 2023. The following variables were determined: flow, suspended solids concentration, suspended solids discharge and turbidity. The sediment rating curves were fitted using the power model. The coefficient of determination was higher than 0.93 for all the fits. As for the models fitted to estimate the suspended solids concentration, the best results were obtained by the power model, using flow as the independent variable, and the linear model, using turbidity as the independent variable. It was concluded that both the rating sediment curve and the models fitted to estimate the solids concentration can be used to assist in the hydrosedimentological monitoring of the Pandeiros River.
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- 2024
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29. Smart sensors using artificial intelligence for on-detector electronics and ASICs
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Carini, Gabriella, Deptuch, Grzegorz, Dickinson, Jennet, Doering, Dionisio, Dragone, Angelo, Fahim, Farah, Harris, Philip, Herbst, Ryan, Herwig, Christian, Huang, Jin, Mandal, Soumyajit, Suarez, Cristina Mantilla, Deiana, Allison McCarn, Miryala, Sandeep, Newcomer, F. Mitchell, Parpillon, Benjamin, Radeka, Veljko, Rankin, Dylan, Ren, Yihui, Rota, Lorenzo, Ruckman, Larry, and Tran, Nhan
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Physics - Instrumentation and Detectors ,High Energy Physics - Experiment - Abstract
Cutting edge detectors push sensing technology by further improving spatial and temporal resolution, increasing detector area and volume, and generally reducing backgrounds and noise. This has led to a explosion of more and more data being generated in next-generation experiments. Therefore, the need for near-sensor, at the data source, processing with more powerful algorithms is becoming increasingly important to more efficiently capture the right experimental data, reduce downstream system complexity, and enable faster and lower-power feedback loops. In this paper, we discuss the motivations and potential applications for on-detector AI. Furthermore, the unique requirements of particle physics can uniquely drive the development of novel AI hardware and design tools. We describe existing modern work for particle physics in this area. Finally, we outline a number of areas of opportunity where we can advance machine learning techniques, codesign workflows, and future microelectronics technologies which will accelerate design, performance, and implementations for next generation experiments., Comment: Contribution to Snowmass 2021; 27 pages, 6 figures
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- 2022
30. Exploiting sparseness in damage characterization: A close look at the regularization techniques
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Memarzadeh, Esmaeil, Bernal, Dionisio, and Ulriksen, Martin D.
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Mathematics - Dynamical Systems - Abstract
The idea of exploiting sparseness in under-determined damage characterization problems is not new, and regularizations techniques that tend to promote sparseness, such as L1-norm minimization, have been investigated in the last ten years or so. Although various claims of merit have been made, two interconnected issues put these claims into question, and this paper brings some attention to the matter. The first is that the relationship between the structural parameters and the modal features previously considered has been linear and to ensure that the premise was closely realized, only very small damage severities have been considered. The second issue, intimately related to the first, is the fact that the noise, which has been typically taken as small relative to the "change in the features", is then unrealistically small. In problems where the damage is sufficiently large, the nonlinear dependence of the features on the parameters cannot be generally discarded. It is found that the attainable performance is much less "impressive" that what has been often claimed. The paper also examines the potential merit of using Lp-norm (0
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- 2022
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31. Neurochemical differences in core regions of the autistic brain: a multivoxel 1H-MRS study in children
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Ana Dionísio, Ana Espírito, Andreia C. Pereira, Susana Mouga, Otília C. d’Almeida, Guiomar Oliveira, and Miguel Castelo-Branco
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Medicine ,Science - Abstract
Abstract Autism spectrum disorder (ASD) is a neurodevelopmental condition which compromises various cognitive and behavioural domains. The understanding of the pathophysiology and molecular neurobiology of ASD is still an open critical research question. Here, we aimed to address ASD neurochemistry in the same time point at key regions that have been associated with its pathophysiology: the insula, hippocampus, putamen and thalamus. We conducted a multivoxel proton magnetic resonance spectroscopy (1H-MRS) study to non-invasively estimate the concentrations of total choline (GPC + PCh, tCho), total N-acetyl-aspartate (NAA + NAAG, tNAA) and Glx (Glu + Gln), presenting the results as ratios to total creatine while investigating replication for ratios to total choline as a secondary analysis. Twenty-two male children aged between 10 and 18 years diagnosed with ASD (none with intellectual disability, in spite of the expected lower IQ) and 22 age- and gender-matched typically developing (TD) controls were included. Aspartate ratios were significantly lower in the insula (tNAA/tCr: p = 0.010; tNAA/tCho: p = 0.012) and putamen (tNAA/tCr: p = 0.015) of ASD individuals in comparison with TD controls. The Glx ratios were significantly higher in the hippocampus of the ASD group (Glx/tCr: p = 0.027; Glx/tCho: p = 0.011). Differences in tNAA and Glx indices suggest that these metabolites might be neurochemical markers of region-specific atypical metabolism in ASD children, with a potential contribution for future advances in clinical monitoring and treatment.
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- 2024
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32. Global and explicit approximation of piecewise smooth 2D functions from cell-average data
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Amat, Sergio, Levin, David, Ruiz-Alvarez, Juan, and Yáñez, Dionisio F.
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Mathematics - Numerical Analysis - Abstract
Given cell-average data values of a piecewise smooth bivariate function $f$ within a domain $\Omega$, we look for a piecewise adaptive approximation to $f$. We are interested in an explicit and global (smooth) approach. Bivariate approximation techniques, as trigonometric or splines approximations, achieve reduced approximation orders near the boundary of the domain and near curves of jump singularities of the function or its derivatives. Whereas the boundary of $\Omega$ is assumed to be known, the subdivision of $\Omega$ to subdomains on which $f$ is smooth is unknown. The first challenge of the proposed approximation algorithm would be to find a good approximation to the curves separating the smooth subdomains of $f$. In the second stage, we simultaneously look for approximations to the different smooth segments of $f$, where on each segment we approximate the function by a linear combination of basis functions $\{p_i\}_{i=1}^M$, considering the corresponding cell-averages. A discrete Laplacian operator applied to the given cell-average data intensifies the structure of the singularity of the data across the curves separating the smooth subdomains of $f$. We refer to these derived values as the signature of the data, and we use it for both approximating the singularity curves separating the different smooth regions of $f$. The main contributions here are improved convergence rates to both the approximation of the singularity curves and the approximation of $f$, an explicit and global formula, and, in particular, the derivation of a piecewise smooth high order approximation to the function.
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- 2022
33. Motivations and Expectations of Olympic Volunteers: Building a Legacy of Personal Development as a Key Factor for the Success of Sports Mega-Events
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Teixeira Mário Coelho, Banza Telma Frade, Almeida Nuno Castanheira, and Sesinando André Dionísio
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sports management ,volunteer development ,sporting events ,olympics ,sports legacy ,Sports ,GV557-1198.995 - Abstract
The scientific breakthrough in understanding the role of sports volunteers, as well as the importance of motivation and expectations management in decision-making, has boosted several studies, helping to reinforce the conceptual idea of a sports legacy, especially in relation to the participation and involvement of Olympic volunteers. In this sense, and reinforcing this idea, this study aimed to analyse and measure the perception of sports volunteers regarding the motivations and expectations arising from their participation in the Rio 2016 Olympic Games. The study followed a quantitative-descriptive and inferential methodology, with a validated sample of 828 responses collected through a semi-structured questionnaire adapted from the original VMS-ISE motivation scale. The results point to a reinforcement of the perceived importance and value associated with participation in the Olympic Games that translate into high levels of motivation and satisfaction by most of the volunteers involved. The most valued factors were the feeling of pleasure promoted by the experience, the possibility of personal and professional development, the passion for the Olympic Games, and the passion for sport. The majority of the candidates validated the post-event expectations as having exceeded their initial ones, and 92.0% of the volunteers would participate in a similar event again. The study allows the reinforcement of sports volunteers intentions and expectations, while validating and confirming previous studies on the importance of motivation and personal development in a successful recruitment strategy that fosters regular and consolidated participation of previous volunteers.
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- 2023
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34. Explicit multivariate approximations from cell-average data
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Amat, Sergio, Levin, David, Ruiz-Alvarez, Juan, and Yáñez, Dionisio F.
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Mathematics - Numerical Analysis - Abstract
Given gridded cell-average data of a smooth multivariate function, we present a constructive explicit procedure for generating a high-order global approximation of the function. One contribution is the derivation of high order approximations to point-values of the function directly from the cell-average data. The second contribution is the development of univariate B-spline based high order quasi-interpolation operators using cell-average data. Multivariate spline quasi-interpolation approximation operators are obtained by tensor products of the univariate operators.
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- 2021
35. Ionic Liquid Crystals as Chromogenic Materials
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Andreia F. M. Santos, João L. Figueirinhas, Madalena Dionísio, Maria H. Godinho, and Luis C. Branco
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ionic liquid crystals ,chromogenic materials ,photochromism ,electrochromism ,thermochromism ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
Ionic liquid crystals (ILCs), a class of soft matter materials whose properties can be tuned by the wise pairing of the cation and anion, have recently emerged as promising candidates for different applications, combining the characteristics of ionic liquids and liquid crystals. Among those potential uses, this review aims to cover chromogenic ILCs. In this context, examples of photo-, electro- and thermochromism based on ILCs are provided. Furthermore, thermotropic and lyotropic ionic liquid crystals are also summarised, including the most common chemical and phase structures, as well as the advantages of confining these materials. This manuscript also comprises the following main experimental techniques used to characterise ILCs: Differential Scanning Calorimetry (DSC), Polarised Optical Microscopy (POM) and X-Ray Powder Diffraction (XRD). Chromogenic ILCs can be interesting smart materials for energy and health purposes.
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- 2024
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36. Evaluation of Chemokines MIG and IP-10 as Immunological Biomarkers of Human Visceral Leishmaniasis: A Systematic Review
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Bruna Eduarda Freitas Monteiro, Elis Dionísio da Silva, Walter Lins Barbosa Júnior, Amanda Virginia Batista Vieira, Roberta dos Santos Souza, Maria Karollyne dos Santos Paiva, Pablo Cantalice Santos Farias, Diego Lins Guedes, Gilberto Silva Nunes Bezerra, and Zulma Maria de Medeiros
- Subjects
visceral leishmaniasis ,chemokines ,biomarker ,MIG ,IP-10 ,systematic review ,Medicine - Abstract
Visceral leishmaniasis (VL) is a neglected tropical disease that is potentially fatal when untreated. Current diagnostic methods have limitations that contribute to ongoing transmission and poor prognosis. Thus, new tests are needed to provide quick, accurate diagnoses and evaluate clinical progression and treatment efficacy. The monokine induced by interferon-gamma (MIG) and interferon-gamma-inducible protein 10 (IP-10) has been associated with the host susceptibility to VL with potential diagnostic and prognostic purposes. We performed a systematic review using four search databases (Scopus, PubMed, Web of Science, and MEDLINE) to identify studies assessing MIG and IP-10 as potential biomarkers in patients with VL across various clinical conditions. A total of 13 studies were potentially eligible and included in this review. The articles, in general, reveal that the chemokines MIG and IP-10 are elevated in response to infection by Leishmania spp., acting on the host’s resistance to the development of the disease. They are associated with asymptomatic conditions and after VL treatment, and this relationship can be observed in both immunocompetent and immunocompromised individuals. Consequently, these chemokines hold relevance in the diagnoses and appropriate management of individuals with VL.
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- 2024
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37. Effects of Cashew Nuts (Anacardium occidentale L.) and Cashew Nut Oil on Intestinal Permeability and Inflammatory Markers during an Energy-Restricted 8-Week Intervention: A Randomized Controlled Trial (Brazilian Nuts Study)
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Talitha Silva Meneguelli, Aline Lage Wendling, Ana Claudia Pelissari Kravchychyn, Daniela Mayumi Usuda Prado Rocha, Ana Paula Dionísio, Josefina Bressan, Hércia Stampini Duarte Martino, Elad Tako, and Helen Hermana Miranda Hermsdorff
- Subjects
Anacardium occidentale L. ,cashew nut oil ,intestinal permeability ,inflammation ,energy-restricted diet ,Chemical technology ,TP1-1185 - Abstract
Cashew nuts can contribute to improving intestinal permeability and inflammation as they contain essential nutrients and bioactive compounds, but no clinical trials have evaluated these potential effects. This randomized trial aimed to assess the effects of cashew nuts and their oil on intestinal permeability and inflammatory markers. Sixty-four adults with overweight or obesity were allocated into three groups receiving energy restriction (−500 kcal/day): control (CT, free nuts), cashew nuts (CN, 30 g/day), or cashew nut oil (OL, 30 mL/day). Urine lactulose and mannitol, plasma zonulin and the lipopolysaccharide-binding protein (LBP), plasma interleukins (IL-6, TNF-α, IL-10, IL-1β, IL-8, and IL-12p70), and C-reactive proteins were analyzed. Energy restriction reduced body fat and other indicators of adiposity without differences between the groups. Only the control group increased LBPs after an 8-week intervention. There were no statistically significant differences found between the groups in terms of intestinal permeability and inflammatory markers. In conclusion, incorporating cashew nuts or cashew nut oil into an energy-restricted 8-week dietary intervention did not change intestinal permeability and inflammatory markers. As studies evaluating cashew nuts on these markers remain scarce, further research is needed, perhaps with a longer study period and a higher concentration of cashew nuts and oil.
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- 2024
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38. The fate of Salmonella enterica and Listeria monocytogenes in the pulp of eight native Brazilian and exotic fruits
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Silva, Beatriz S., Amorim-Neto, Dionisio P., Pia, Arthur K.R., Campagnollo, Fernanda B., Furtado, Marianna M., Carvalho, Ana Carolina B.R., Oteiza, Juan M., and Sant'Ana, Anderson S.
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- 2024
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39. Osteoporosis screening using machine learning and electromagnetic waves
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Albuquerque, Gabriela A., Carvalho, Dionísio D. A., Cruz, Agnaldo S., Santos, João P. Q., Machado, Guilherme M., Gendriz, Ignácio S., Fernandes, Felipe R. S., Barbalho, Ingridy M. P., Santos, Marquiony M., Teixeira, César A. D., Henriques, Jorge M. O., Gil, Paulo, Neto, Adrião D. D., Campos, Antonio L. P. S., Lima, Josivan G., Paiva, Jailton C., Morais, Antonio H. F., Lima, Thaisa Santos, and Valentim, Ricardo A. M.
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- 2023
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40. A Feature Selection Committee Method Using Empirical Mode Decomposition for Multiple Fault Classification in a Wind Turbine Gearbox
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Felix, Leonardo Oldani, de Sá Só Martins, Dionísio Henrique Carvalho, Monteiro, Ulisses Admar Barbosa Vicente, Castro, Brenno Moura, Pinto, Luiz Antônio Vaz, and Martins, Carlos Alfredo Orfão
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- 2023
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41. Autocuidado Familiar: ensaio teórico para famílias com filho(s) com perturbação do desenvolvimento intelectual
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Teresa Dionísio Mestre, Ermelinda Caldeira, and Manuel José Lopes
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autocuidado ,enfermagem familiar ,deficiência intelectual ,doença crónica ,Medicine (General) ,R5-920 ,Public aspects of medicine ,RA1-1270 - Abstract
Enquadramento: o autocuidado surge no contexto familiar, apesar de ser encarado como um determinante de saúde individual. A família, entendida como um sistema e unidade social converge para um padrão de autocuidado e não para um somatório do mesmo. Objetivo: efetuar a transposição do autocuidado individual para o familiar, atendendo às necessidades e características da família com filho(s) com perturbação do desenvolvimento intelectual, através da adoção do autocuidado familiar, enquanto conceito central de um padrão de cuidados. Metodologia: ensaio teórico que reflete o percurso reflexivo de conceção do autocuidado familiar nas famílias identificadas, ancorado na Teoria do Autocuidado de Enfermagem, no Modelo de Parceria de Cuidados, na Teoria de Médio Alcance do Autocuidado da Doença Crónica e na Teoria Geral dos Sistemas. Resultados: identificaram-se fatores condicionantes ao desenvolvimento de autocuidado familiar, que antecedem quatro domínios em constante interação com o ambiente, sociedade e comunidade. Através destes, a família procura manter, proteger e/ou promover a saúde, mediada por comportamentos de monitorização e gestão da doença. Conclusão: as famílias em análise procuram alcançar a saúde familiar, mantendo-a por meio de práticas de promoção da saúde e gestão da doença, sempre mediadas por comportamentos de autocuidado familiar.
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- 2024
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42. Corrigendum: Evaluation of PIK3CA mutations in advanced ER+/HER2-breast cancer in Portugal – U-PIK Project
- Author
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Ana Peixoto, Luís Cirnes, Ana Luísa Carvalho, Maria João Andrade, Maria José Brito, Paula Borralho, Nuno Coimbra, Pedro M. Borralho, Ana Sofia Carneiro, Lisandra Castro, Lurdes Correia, Maria Rita Dionísio, Carlos Faria, Paulo Figueiredo, Ana Gomes, Joana Paixão, Manuela Pinheiro, Hugo Prazeres, Joana Ribeiro, Natália Salgueiro, Fernando. C Schmitt, Fátima Silva, Ana Rita Silvestre, Ana Carla Sousa, Joana Almeida-Tavares, Manuel R. Teixeira, Saudade André, and Jose Carlos Machado
- Subjects
advanced breast cancer ,ER+/HER2− ,PIK3CA mutations ,ring trial ,validation ,molecular pathology ,Biology (General) ,QH301-705.5 - Published
- 2024
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43. Impact of family-centered care in families with children with intellectual disability: A systematic review
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Teresa Dionísio Mestre, Manuel José Lopes, David Matias Mestre, Rogério Ferrinho Ferreira, Ana Pedro Costa, and Ermelinda Valente Caldeira
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Disabled children ,Family ,Family nursing ,Health personnel ,Intellectual disability ,Systematic review ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background: Family-Centered Care (FCC) is an approach to healthcare planning, delivery and evaluation, based on beneficial partnerships between health professionals, patients and families. FCC may be particularly relevant for families with children with intellectual disability (ID), given their needs of continuum care. Objective: To identify which components of the FCC are practiced and which health outcomes are considered effective in families with children with ID. Method: A systematic review guided by the PRISMA STATEMENT 2020 approach and the STROBE reporting guidelines was performed on specific databases through the EBSCOhost Web platform: MEDLINE with Full Text, CINAHL PLUS with Full Text, Academic Search Complete and Psychology and Behavioral Sciences Collection. Peer-reviewed articles published in English or Portuguese languages from 2018 to September 2023 were retrieved. Methodological quality was established using the Quality Assessment Tool for Observational, Cohort and Cross-Sectional Studies – NHLBI, NIH. Results: Ten studies met the eligibility criteria and were synthetized. The results revealed nine components, reflecting the way FCC was developed: shared decision-making; family education; respect for culture; family engagement; recognition of the family's needs, characteristics and interests; specialized care support; social and emotional support; family functionality; and family seen as a unit. The health outcomes demonstrate effective gains in improving children's health through family satisfaction with health services. Also achieved psychological and social benefits, with improved family well-being and quality of life, favoring family empowerment. Conclusions: The evidence suggests that FCC components involves an effective partnership between the family and health professionals as the main key in developing care plans, as well as the experience that the family unit brings to the delivery of care. FCC approach include all family members as decision-makers, providing emotional, physical and instrumental levels of support. Health outcomes emerged in three strands; for children with ID, families and health services.
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- 2024
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44. Endobronchial amphotericin B to treat hemoptysis in an inoperable patient with aspergillosis
- Author
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Mário Pinto, João Rodrigues, Marta Silva, Dionísio Maia, and António Miguel
- Subjects
Pulmonary aspergillosis ,Aspergilloma ,Hemoptysis ,Flexible bronchoscopy ,Amphotericin B ,Medicine (General) ,R5-920 ,Biology (General) ,QH301-705.5 - Abstract
A 37-year-old man presented with chronic cavitary pulmonary aspergillosis and hemoptysis refractory to systemic antifungal therapy with voriconazole and bronchial artery embolization. Surgical excision was unfeasible due to the patient's refusal of blood transfusions. Ten sessions of intracavitary instillation of amphotericin B via flexible bronchoscopy were then performed. Hemoptysis cessation and aspergilloma resolution were achieved, with no toxicity or side effects, and the clinical benefits were sustained at six months of follow-up.
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- 2024
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45. Optimization of laccase production by Pleurotus ostreatus Florida and evaluation of metabolites generated during Kraft lignin biotransformation
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Franco, Paula C. I., Shiraishi, Igor S., Dekker, Robert F. H., Barbosa-Dekker, Aneli M., Borsato, Dionísio, Angilelli, Karina B., Evaristo, Geisa P. C., Simionato, Julliana I., and Daniel, Juliana F. S.
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- 2023
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46. Phenotypic, genotypic, and resistome of mesophilic spore-forming bacteria isolated from pasteurized liquid whole egg
- Author
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Chincha, Alexandra A.I.A., Marone, Marina P., Pia, Arthur K.R., Freire, Luisa, Amorim-Neto, Dionisio P., Carazzolle, Marcelo F., and Sant'Ana, Anderson S.
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- 2024
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47. Thick branes in the scalar-tensor representation of $f(R,T)$ gravity
- Author
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Rosa, João Luís, Marques, Matheus A., Bazeia, Dionisio, and Lobo, Francisco S. N.
- Subjects
General Relativity and Quantum Cosmology - Abstract
Braneworld scenarios consider our observable universe as a brane embedded in a five-dimensional bulk. In this work, we consider thick braneworld systems in the recently proposed dynamically equivalent scalar-tensor representation of $f(R,T)$ gravity, where $R$ is the Ricci scalar and $T$ the trace of the stress-energy tensor. In the general $f\left(R,T\right)$ case we consider two different models: a brane model without matter fields where the geometry is supported solely by the gravitational fields, and a second model where matter is described by a scalar field with a potential. The particular cases for which the function $f\left(R,T\right)$ is separable in the forms $F\left(R\right)+T$ and $R+G\left(T\right)$, which give rise to scalar-tensor representations with a single auxiliary scalar field, are studied separately. The stability of the gravitational sector is investigated and the models are shown to be stable against small perturbations of the metric. Furthermore, we show that in the $f\left(R,T\right)$ model in the presence of an extra matter field, the shape of the graviton zero-mode develops internal structure under appropriate choices of the parameters of the model., Comment: 14 pages, 12 figures
- Published
- 2021
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48. Monotone cubic spline interpolation for functions with a strong gradient
- Author
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Aràndiga, Francesc, Baeza, Antonio, and Yáñez, Dionisio F.
- Subjects
Mathematics - Numerical Analysis - Abstract
Spline interpolation has been used in several applications due to its favorable properties regarding smoothness and accuracy of the interpolant. However, when there exists a discontinuity or a steep gradient in the data, some artifacts can appear due to the Gibbs phenomenon. Also, preservation of data monotonicity is a requirement in some applications, and that property is not automatically verified by the interpolator. In this paper, we study sufficient conditions to obtain monotone cubic splines based on Hermite cubic interpolators and propose different ways to construct them using non-linear formulas. The order of approximation, in each case, is calculated and several numerical experiments are performed to contrast the theoretical results.
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- 2021
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49. Average scattering entropy of quantum graphs
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Silva, Alison A., Andrade, Fabiano M., and Bazeia, Dionisio
- Subjects
Quantum Physics ,Mathematical Physics - Abstract
The scattering amplitude in simple quantum graphs is a well-known process which may be highly complex. In this work, motivated by the Shannon entropy, we propose a methodology that associates to a graph a scattering entropy, which we call the average scattering entropy. It is defined by taking into account the period of the scattering amplitude which we calculate using the Green's function procedure. We first describe the methodology on general grounds, and then exemplify our findings considering several distinct groups of graphs. We go on and investigate other possibilities, one that contains groups of graphs with the same number of vertices, with the same degree, and the same number of edges, with the same length, but with distinct topologies and with different entropies. And the other, which contains graphs of the fishbone type, where the scattering entropy depends on the boundary conditions on the vertices of degree $1$, with the corresponding values decreasing and saturating very rapidly, as we increase the number of elementary structures in the graphs., Comment: 9 pages, 12 figures, matches published version
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- 2021
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50. The Marine Macroalgae Collection from Herbarium João de Carvalho e Vasconcellos (LISI)—140 Years of History
- Author
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João Canilho Santos, Paula Paes, Pedro Arsénio, Rui Figueira, José Carlos Costa, Margarida Dionísio Lopes, Helena Cotrim, and Dalila Espírito-Santo
- Subjects
phycology ,algae ,historical collections ,taxonomy ,metadata ,digitization ,Biology (General) ,QH301-705.5 - Abstract
Herbaria phycological collections have approximately one million 700 thousand specimens preserved in European herbaria, a significantly lower number when compared to vascular plants, due to factors such as greater sampling difficulty and fewer specialists. Several studies report that coastal systems have undergone dramatic ecological changes in the last 150 years, with macroalgae being a particularly affected group. Thus, macroalgal herbaria are essential sources for the study and conservation of this biodiversity, as well as a pillar that responds to several ecological questions. Despite having a large coastline, Portugal’s phycological collections are scarce, poorly developed, and practically inaccessible digitally. In 2021/2022, all the phycological specimens present at LISI were the focus of this exploratory project whose objective was to catalog them, taxonomically review the specimens and place them at the service of the scientific community through the incorporation of digitized vouchers into online databases. Three marine collections were constituted and studied, accounting for a total of 852 vouchers and more than 1800 specimens, being the Portuguese Marine Macroalgae Collection, the oldest digitized phycological collection available in Portugal. This project provides an opportunity for other educational institutions to embrace their long-neglected collections as well.
- Published
- 2024
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- View/download PDF
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