Search for new physics in the multijet and missing transverse momentum final state in proton-proton collisions at root s=8 Tev

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

A Reynolds stress model for turbulent flows of viscoelastic fluids

A second-order closure is developed for predicting turbulent flows of viscoelastic fluids described by a modified generalised Newtonian fluid model incorporating a nonlinear viscosity that depends on a strain-hardening Trouton ratio as a means to handle some of the effects of viscoelasticity upon turbulent flows. Its performance is assessed by comparing its predictions for fully developed turbulent pipe flow with experimental data for four different dilute polymeric solutions and also with two sets of direct numerical simulation data for fluids theoretically described by the finitely extensible nonlinear elastic - Peterlin model. The model is based on a Newtonian Reynolds stress closure to predict Newtonian fluid flows, which incorporates low Reynolds number damping functions to properly deal with wall effects and to provide the capability to handle fluid viscoelasticity more effectively. This new turbulence model was able to capture well the drag reduction of various viscoelastic fluids over a wide range of Reynolds numbers and performed better than previously developed models for the same type of constitutive equation, even if the streamwise and wall-normal turbulence intensities were underpredicted.

Probing new physics in diphoton production with proton tagging at the Large Hadron Collider

The sensitivities to anomalous quartic photon couplings at the Large Hadron Collider are estimated using diphoton production via photon fusion. The tagging of the protons proves to be a very powerful tool to suppress the background and unprecedented sensitivities down to 7 x 10(-15) GeV-4 are obtained, providing a new window on extra dimensions and strongly interacting composite states in the multi-TeV range. Generic contributions to quartic photon couplings from charged and neutral particles with arbitrary spin are also presented.

Numerical and experimental investigations of three-dimensional container filling with Newtonian viscous fluids

Conselho Nacional de Desenvolvimento Cient��fico e Tecnol��gico (CNPq)

Theoretical Analysis and Experimental Validation of the Scholte Wave Propagation in Immersed Plates for the Characterization of Viscous Fluids

This work reports the study of an attractive interfacial wave for application in ultrasonic NDE techniques for inspection and fluid characterization. This wave, called quasi-Scholte mode, is a kind of flexural wave in a plate in contact with a fluid which presents a good sensitivity to the fluid properties. In order to explore this feature, the phase velocity curve of quasi-Scholte mode is experimentally measured in a plate in contact with a viscous fluid, showing a good agreement with theory.

Estudo da fluidodin��mica de uma mistura de s��lidos em um leito fluidizado g��s-s��lido

Fluidization consists in a bed of solid particles acquire fluid behavior by using a fluid (in this case air) flowing through the solid particles. Because of this, it can be a good mix of these materials, as well as to show increased rates of heat and mass transport. The fluid flowing through the spaces between the particles gives an interstitial velocity, that if is too low does not cause movement of the particulates. The gradual increase in speed will generate small vibrations between the particles promotes its fluidization. Our study focus in the fluid state of solid bed , when the fluid velocity reaches a state where the drag forces are sufficient to support the weight of the solid particles making these solids behave like fluids . Knowledge of the minimum velocity required to fluidize that particles is of great importance since below this speed there is no fluidization, and far above it, the solids are carried out of the bed. The fluidized bed reactor is widely used in physics and engineering, particularly in gas-solid fluidization, with emphasis on thermochemical processes

Dipolo e escoamento uniforme: escoamento em torno de um cilindro circular

The study of movements of ideals fluids is more simple that the viscous fluids because do not have the presence of tension of shear. The normal tensions are the one that must be considered in this analysis. The theory corresponding to these flows is the same used in other fields of the physics called Theory of Potentials Fields, which the vector identity is fundamental. Any flow into irrotational (null vorticity) physically possibly has a current function and a potential of velocity that satisfied the equation of Laplace. Reciprocally, any solution of equation of Laplace represents a current function or a potential of velocity of a flow into physically possible. Once the equation of Laplace is linear, the addiction of any numbers of solutions is also a solution. So, several potentials flows into can be constructed superposing configurations of elementary flows into. The purpose of the superposition of elementary flows into is a production of similar configurations to those of practical interest. The combination of mathematical elegancy with utility in the potential flow into attracted many for its study. Some of the most famous mathematician of history studied the theory and application of ���hydrodynamic���, how was called the potential fluid into before 1900

The Didactic Transposition of the Photoelectric Effect in High School Brazilian Physics Textbooks

�� not��rio que o livro did��tico desempenha um papel fundamental na pr��tica pedag��gica da maioria dos professores de F��sica constituindo importante fonte de refer��ncia para professores e estudantes. Ao mesmo tempo representa a mem��ria impressa das demandas e paradigmas de ensino, e procura atender ��s exig��ncias prescritas na legisla����o e diretrizes, de uma determinada localidade e per��odo. Atualmente, a inser����o de F��sica Moderna e Contempor��nea no curr��culo do Ensino M��dio brasileiro est�� entre as prioridades, preconizando, entre. outros, o ensino do efeito fotoel��trico, em fun����o da relev��ncia do fen��meno ao corroborar a interpreta����o corpuscular da natureza da luz, e o consequente laureio de Albert Einstein com o Pr��mio Nobel. Estudos realizados apontam que muitos dos livros did��ticos apresentam a hist��ria do efeito fotoel��trico de maneira superficial ou err��nea, e exp��em incorretamente a fun����o trabalho e o conceito de f��ton (Klassen, 2011). Tendo em vista o exposto, objetivamos analisar como ocorre a apresenta����o do efeito fotoel��trico especificamente em dez cole����es did��ticas brasileiras aprovadas pelo Programa Nacional do Livro Did��tico do Ensino M��dio 2012 do governo federal, tendo como aporte te��rico as considera����es de Yves Chevallard (Brockington e Pietrocola, 2005). Procuramos resposta para a seguinte pergunta: Quais s��o as transposi����es ocorridas na apresenta����o do efeito fotoel��trico (saber s��bio) para se tornar o saber a ensinar em materiais escolares? Nossa an��lise centrou-se no processo de descontextualiza����o, entendido como o processo pelo qual o saber s��bio passa para que seja ensin��vel, sendo necess��rio que seja arrancado de seu contexto original, ou seja, o seu processo hist��rico.