Elementary Particles
Mostrando 1-12 de 47 artigos, teses e dissertações.
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1. Center of mass of a system of variable mass particles
Abstract We study the dynamics of the center of mass (CM) of a set of particles when the number of particles in the system varies during a short interval of time, or when the value of the mass of one of the particles depends on time. We show that in both situations, while the population or mass of the system varies, the linear momentum of the CM differs from
Rev. Bras. Ensino Fís.. Publicado em: 21/02/2019
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2. Mechanical and thermomechanical properties of polyamide 6/Brazilian organoclay nanocomposites
Abstract Polymer/clay nanocomposites are a new class of composites with polymer matrices where the disperse phase is a silicate with elementary particles that have at least one of dimensions in nanometer order. Polyamide 6/Brazilian organoclay nanocomposites were prepared by melt intercalation, and the mechanical, thermal and thermomechanical properties were
Polímeros. Publicado em: 15/03/2016
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3. Estudo sobre a identificação de hádrons em câmaras de fotoemulsão / Study about hadron identification in emulsion chambers
This work introduces the importance of photoemulsion chambers that remain in use after decades and still offer many advantages for elementary particle physics. We cite OPERA (Oscillation Project with Emulsion-tRacking Apparatus) detector that is the greatest lead photoemulsion chamber detector ever constructed as an example of its application nowadays (nine
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/04/2012
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4. Desconstrução dimensional e violação de sabor / Dimensional desconstruction and flavor violation
The Standard Model of elementary particles describes the electroweak and strong interactions, and its predictions have successfully matched existing experimental data. However, there are some issues that are not addressed by this model, such as the gauge hierarchy problem and the origin of fermion masses. Both problems can be solved naturally using Warped Ex
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/09/2011
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5. Partículas elementares e interações fundamentais no ensino médio
Nesta dissertação apresenta-se uma sugestão de atualização curricular para o Ensino Médio por meio da inserção de tópicos de Física Moderna e Contemporânea. O objetivo desta dissertação foi desenvolver e aplicar uma Unidade de Aprendizagem (UA) sobre Partículas Elementares, além de investigar indícios de aprendizagem significativa proveniente
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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6. INVESTIGANDO AS CONCEPÇÕES DOS ESTUDANTES DO ENSINO FUNDAMENTAL AO SUPERIOR SOBRE ÁCIDOS E BASES / INVESTIGATING STUDENTS CONCEPTIONS OF BASIC EDUCATION TO HIGHER EDUCATION ON ACIDS AND BASES
This research aims at diagnosing alternative conceptions to scientific knowledge of students in Elementary Education, Middle and Upper on acids and bases. The survey was conducted between 2008 and 2009 and applied to 26 primary school students (ninth year), 36 high school (third year) and 51 Degree in Chemistry (26 freshmen and 25 trainees) totaling 113 stud
Publicado em: 2010
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7. Produção de estranheza em colisões de ions pesados relativisticos / Strangeness production in relkativistic heavy ion collisions
Relativistic heavy-ion collisions allow us to study the behavior of nuclear matter at extreme conditions of temperature and energy density. In these conditions, we expect a phase transition of matter where a free state of quarks and gluons would be formed, and that is known as Quark-Gluon Plasma (QGP). With the aim to study this new state of matter and its f
Publicado em: 2008
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8. Quark matter (strangelets) from astrophysical sources and its detection by terrestrial experiments. / Matéria de quarks (strangelets) de origem astrofísica e sua detecção por experimentos terrestres
The strange quark matter hypothesis, which states that a plasma composed of quarks up, down and strange in roughly equal amounts is absolutely stable at zero pressure, has been studied for more than twenty years, both theoretically and during searches for its detection in specific experiments. If strange quark matter is indeed stable, then there could be imp
Publicado em: 2008
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9. Issuance of metals by motor vehicles and their effects on public health / Emissão de metais por veículos automotores e seus efeitos à saúde pública
Introduction: The presence of fine metal particles in the urban atmosphere is a big concern considering that a significant accumulation of these elements has been registered during the last decades. Information about metal level in the tailpipe is scarce and specific Brazilian emission references are basically inexistent. Objective. Experimentally characteri
Publicado em: 2007
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10. Exposição aguda ao material particulado total em suspensão proveniente de diferentes fontes e suas repercussões nas respostas inflamatórias, sistêmica e local, em ratos / Acute exposure to total suspended particles from different sources and their impacts on both systemic and local inflammatory responses in rats
Background: Air pollution is associated with both increased morbidity and mortality. These associations persist even at lower concentrations and shortterm exposure. Objectives: To assess the impact of the components of three different sources of Total Suspended Particles (TSP) on local and systemic inflammatory responses in healthy rats. Methods: TSP from au
Publicado em: 2007
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11. CaracterizaÃÃo de diferentes granulados e comprimidos de carbonato de cÃlcio a partir do pà de concha de ostras / CHARACTERIZATION OF DIFFERENT GRANULATES AND TABLETS OF CALCIUM CARBONATE FROM OYSTER SHELL POWDER
Osteoporosis is a progressive systemic skeletal disease, characterized by bone mass reduction and deterioration of the bone micro-architecture, leading to fragility and with consequent increase of fracture susceptibility. The preliminary and secondary target of pharmacotherapy in osteoporosis is to prevent bone fractures. Initial treatment of osteoporosis mu
Publicado em: 2007
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12. Studies of air pollution in the municipal district of Sete Lagoas, MG using nuclear techniques / Estudos da poluição do ar do município de Sete Lagoas, MG utilizando técnicas nucleares
Toxic metals, such as Ni, V, Zn, Cu, Cr, Mn and metalloids as As and Se and their compositions are associated mainly with the smaller diameter particulates present in the atmospheric aerosols. This fact is important, principally, when it concerns public health, because this is considered the breathable fraction of particles that can penetrate deeply into the
Publicado em: 2006