227 research outputs found
Efeitos de variáveis cognitivas, emocionais e atitudinais no rendimento a matemática
Several predictive variables have been proposed to explain achievement on mathematics, allowing for the anticipation of complexity and the combination of multiple variables. Some studies indicate the multifactorial nature of mathematical performance, combining the cognitive and affective dimensions of the individual and the teaching and learning processes of mathematics. The main objective of this study is to evaluate the impact of cognitive, emotional and attitudinal variables on math performance. The results highlight the need to look at mathematics achievement in the 4th year of school using a multivariate approach
Self-consistency in Theories with a Minimal Length
The aim of this paper is to clarify the relation between three different
approaches of theories with a minimal length scale: A modification of the
Lorentz-group in the 'Deformed Special Relativity', theories with a
'Generalized Uncertainty Principle' and those with 'Modified Dispersion
Relations'. It is shown that the first two are equivalent, how they can be
translated into each other, and how the third can be obtained from them. An
adequate theory with a minimal length scale requires all three features to be
present.Comment: typos corrected, published with new title following referee's advic
1-D Harmonic Oscillator in Snyder Space, the Classic and the Quantum
The 1-D dimension harmonic oscillator in Snyder space is investigated in its
classical and quantum versions. The classical trajectory is obtained and the
semiclassical quantization from the phase space trajectories is discussed. In
the meanwhile, an effective cutoff to high frequencies is found. The quantum
version is developed and an equivalent usual harmonic oscillator is obtained
through an effective mass and an effective frequency introduced in the model.
This modified parameters give us an also modified energy spectra.Comment: 8 pages, 2 figure
Evaluation of the AIDS risk perception among healthcare workers in the hospital University Unit of Messina (Italy)
No Summar
Smart cities and smart tourism: what future do they bring?
We have sought to understand the current state of the art on smart
tourism and on smart cities. Furthermore, we have sought to understand community
awareness and the will to embrace innovation, as they are decisive
factors to acquire base knowledge and overcome barriers in (soon to be)
overpopulated cities and for those who are looking for a limited time culture
experience - known as tourists. We live in an age where technology is
increasingly present in our lives and provides us solutions to societal problems.
Problems such as traffic, infrastructure and natural resources management, or
even increasing citizens’ participation in governance, bringing them closer to
decision-making. The objective is to understand the current level of people’s
knowledge about the impact that technologies have on the society in which we
live and their perception of the usefulness in solving these same problems.
Therefore, an anonymous questionnaire was carried out (176 valid answers were
received), as well as a focus group with two experts on the Smart Cities subject.
What future is brought by those who live and breathe technology? Are people
willing to accept a paradigm shift?This work is financed by the ERDF – European Regional Development Fund through the
Operational Programme for Competitiveness and Internationalisation - COMPETE 2020 Programme
and by National Funds through the Portuguese funding agency, FCT - Fundação para a
Ciência e a Tecnologia within project POCI-01-0145-FEDER-031309 entitled “PromoTourVR -
Promoting Tourism Destinations with Multisensory Immersive Media”.info:eu-repo/semantics/publishedVersio
Upcycling spent brewery grains through the production of carbon adsorbents: application to the removal of carbamazepine from water
Spent brewery grains, a by-product of the brewing process, were used as precursor of biochars and activated carbons to be applied to the removal of pharmaceuticals from water. Biochars were obtained by pyrolysis of the raw materials, while activated carbons were produced by adding a previous chemical activation step. The influence of using different precursors (from distinct fermentation processes), activating agents (potassium hydroxide, sodium hydroxide, and phosphoric acid), pyrolysis temperatures, and residence times was assessed. The adsorbents were physicochemically characterized and applied to the removal of the antiepileptic carbamazepine from water. Potassium hydroxide activation produced the materials with the most promising properties and adsorptive removals, with specific surface areas up to 1120 m2 g-1 and maximum adsorption capacities up to 190 ± 27 mg g-1 in ultrapure water. The adsorption capacity suffered a reduction of < 70% in wastewater, allowing to evaluate the impact of realistic matrices on the efficiency of the materials.publishe
Rayleigh-Ritz Calculation of Effective Potential Far From Equilibrium
We demonstrate the utility of a Rayleigh-Ritz scheme recently proposed to
compute the nonequilibrium effective potential nonperturbatively in a strong
noise regime far from equilibrium. A simple Kramers model of an ionic conductor
is used to illustrate the efficiency of the method.Comment: 4 pages, Latex (Version 2.09), 2 figures (Postscript),
tar+gzip+uuencoded. Submitted to Phys. Rev. Let
Microsporogenesis in Brachiaria brizantha (Poaceae) as a selection tool for breeding.
The genus Brachiaria comprises more than 100 species and is the single most important genus of forage grass in the tropics. Brachiaria brizantha , widely used in Brazilian pastures for beef and dairy production, is native to tropical Africa. As a subsidy to the breeding program underway in Brazil, cytological studies were employed to determine the chromosome number and to evaluate microsporogenesis in 46 accessions of this species available at Embrapa Beef Cattle (Brazil)
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