18 research outputs found
Radio modelling of the brightest and most luminous non-thermal colliding-wind binary Apep
Stars and planetary system
Radio modelling of the brightest and most luminous non-thermal colliding-wind binary Apep
Stars and planetary system
Evolutionary-enhanced quantum supervised learning model
Quantum supervised learning, utilizing variational circuits, stands out as a
promising technology for NISQ devices due to its efficiency in hardware
resource utilization during the creation of quantum feature maps and the
implementation of hardware-efficient ansatz with trainable parameters. Despite
these advantages, the training of quantum models encounters challenges, notably
the barren plateau phenomenon, leading to stagnation in learning during
optimization iterations. This study proposes an innovative approach: an
evolutionary-enhanced ansatz-free supervised learning model. In contrast to
parametrized circuits, our model employs circuits with variable topology that
evolves through an elitist method, mitigating the barren plateau issue.
Additionally, we introduce a novel concept, the superposition of multi-hot
encodings, facilitating the treatment of multi-classification problems. Our
framework successfully avoids barren plateaus, resulting in enhanced model
accuracy. Comparative analysis with variational quantum classifiers from the
technology's state-of-the-art reveal a substantial improvement in training
efficiency and precision. Furthermore, we conduct tests on a challenging
dataset class, traditionally problematic for conventional kernel machines,
demonstrating a potential alternative path for achieving quantum advantage in
supervised learning for NISQ era
A review of phytic acid sources, obtention, and applications
Phytic acid (PA), extracted from oilseeds, legumes, cereals, nuts, and pollen by acid solutions under heating and/or stirring and then purified, has shown beneficial health and physiological effects due to its pronounced antioxidant activity and ability to chelate Fe3+ ions. Publications on PA have increased, especially the ones reporting its effect on disease prevention and treatment. Moreover, recent studies have suggested the PA efficacy as a foodborne pathogens inhibitor. Therefore, due to its countless proven properties, phytic acid has gained greater attention than its common classification as just an antinutrient. Past and current studies have been reviewed to provide an overview on PA structure, sources, biosynthesis, extraction, purification, and applications.The authors would like to thank the financial support of CNPq, CAPES (finance code 001) and Fundação Araucária
(project code 3462014). Joana S. Amaral is thankful to the Foundation for Science and Technology (FCT, Portugal) for
their financial support by national funds FCT/MCTES to CIMO (UIDB/00690/2020).This work was supported by the CNPq; Coordenação de Aperfeiçoamento de Pessoal de NÃvel Superior [001]; Fundação
Araucária [3462014]; Foundation for Science and Technology [UIDB/00690/2020].info:eu-repo/semantics/publishedVersio
Comparing hypervelocity star populations from the Large Magellanic Cloud and the Milky Way
Galaxie
Ensino de Ciências e Matemática: elementos didáticos para teoria e experimentação
O livro Ensino de Ciências e Matemática — elementos didáticos para teoria e experimentação visa ser um referencial para professores e estudantes destas duas áreas do conhecimento pautado na ideia da busca de novas práticas pedagógicas para o desenvolvimento de competências por meio da aprendizagem dialógica, cuja base é o correto trabalho da teoria e da experimentação — elementos norteadores do pensamento cientÃfico.
Seu conteúdo é resultante de notas de aula da Especialização em Ensino de Ciências e Matemática ofertada por docentes da Universidade Federal da Integração Latino-Americana (UNILA) como curso de formação continuada (Comfor/MEC) para professores da educação básica no Oeste do Paraná
Phytic acid against clostridium perfringens type a: a food matrix study
This study evaluated the inhibitory effect of phytic acid (PA) on the spore germination and
vegetative cells growth of Clostridium perfringens type A, as well as its effect in combination with
maltodextrin (MD) in cooked sausages. The addition of 1% PA showed a satisfactory inhibition of
spores’ germination and vegetative cells growth of C. perfringens in BHI media. The inhibitory effect
of 1% PA on vegetative cells was similar to the additive sodium sorbate (SS) at 10%. Subsequently,
a mixture of PA-MD (1:1; w/w) was evaluated for the inhibition of C. perfringens spores in cooked
sausages. The PA-MD 1.5% and 2.5% had a similar performance to SS 10% and a similar or higher
performance than 0.015% NO2 (p < 0.05). In an unprecedented way, the present study demonstrated
that PA inhibited spore germination and vegetative cells growth of C. perfringens, highlighting its
potential use as an alternative and natural preservative for the meat industry.This research was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de
NÃvel Superior-Brazil (CAPES)-Finance Code 001, Conselho Nacional de Desenvolvimento CientÃfico
e Tecnológico-Brazil (CNPq), and Fundação Araucária-Brazil-Programa Universal Pesquisa Básica e Aplicada (Edital 05/2011, Agreement 346/2014). J.S. Amaral is grateful to the Foundation for
Science and Technology (FCT, Portugal) for financial support by national funds FCT/MCTES to
CIMO (UIDB/00690/2020).info:eu-repo/semantics/publishedVersio
Recommended from our members
V-LoTSS: The circularly polarised LOFAR Two-metre Sky Survey
We present the detection of 68 sources from the most sensitive radio survey in circular polarisation conducted to date. We used the second data release of the 144 MHz LOFAR Two-metre Sky Survey to produce circularly polarised maps with a median noise of 140 µJy beam−1 and resolution of 20″ for ≈27% of the northern sky (5634 deg2). The leakage of total intensity into circular polarisation is measured to be ≈0.06%, and our survey is complete at flux densities ≥1 mJy. A detection is considered reliable when the circularly polarised fraction exceeds 1%. We find the population of circularly polarised sources is composed of four distinct classes: stellar systems, pulsars, active galactic nuclei, and sources unidentified in the literature. The stellar systems can be further separated into chromospherically active stars, M dwarfs, and brown dwarfs. Based on the circularly polarised fraction and lack of an optical counterpart, we show it is possible to infer whether the unidentified sources are likely unknown pulsars or brown dwarfs. By the completion of this survey of the northern sky, we expect to detect 300±100 circularly polarised sources
Exoplanet interior retrievals:core masses and metallicities from atmospheric abundances
The mass and distribution of metals in the interiors of exoplanets are essential for constraining their formation and evolution processes. Never the less, with only masses and radii measured, the determination of exoplanet interior structures is degenerate, and so far simplified assumptions have mostly been used to derive planetary metallicities. In this work, we present a method based on a state-of-The-Art interior code, recently used for Jupiter, and a Bayesian framework, to explore the possibility of retrieving the interior structure of exoplanets. We use masses, radii, equilibrium temperatures, and measured atmospheric metallicities to retrieve planetary bulk metallicities and core masses. Following results on the giant planets in the Solar system and recent development in planet formation, we implement two interior structure models: one with a homogeneous envelope and one with an inhomogeneous one. Our method is first evaluated using a test planet and then applied to a sample of 37 giant exoplanets with observed atmospheric metallicities from the pre-JWST era. Although neither internal structure model is preferred with the current data, it is possible to obtain information on the interior properties of the planets, such as the core mass, through atmospheric measurements in both cases. We present updated metal mass fractions, in agreement with recent results on giant planets in the Solar system.</p