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Search Results: 1 - 10 of 306857 matches for " J. Lopes "
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Simple General Purpose Ion Beam Deceleration System Using a Single Electrode Lens  [PDF]
J. Lopes, J. Rocha
World Journal of Engineering and Technology (WJET) , 2015, DOI: 10.4236/wjet.2015.33014
Abstract: Ion beam deceleration properties of a newly developed low-energy ion beam implantation system were studied. The objective of this system was to produce general purpose low-energy (5 to 15 keV) implantations with high current beam of hundreds of μA level, providing the most wide implantation area possible and allowing continuously magnetic scanning of the beam over the sample(s). This paper describes the developed system installed in the high-current ion implanter at the Laboratory of Accelerators and Radiation Technologies of the Nuclear and Technological Cam-pus, Sacavém, Portugal (CTN).
Forty years of the first attempt at the electroweak unification and of the prediction of the weak neutral boson Z0
Leite Lopes, J.;
Brazilian Journal of Physics , 1999, DOI: 10.1590/S0103-97331999000300024
Abstract: the author describes his first attempt in 1958 at the unification of electromagnetic and weak interactions and his prediction in the same paper of the neutral z0 boson which would be the intermediate quantum exchanged in an eventual electron-neutron weak interaction (as muonic neutrinos were not known at that time).
As potencialidades analíticas da Nova Sociologia Econ?mica
Lopes Júnior, Edmilson;
Sociedade e Estado , 2002, DOI: 10.1590/S0102-69922002000100004
Abstract: the new economic sociology is the most promising reaction of sociology against the "economic imperialism" that happened in the field since the 80's. in this article, we draw an overview of this rich research field of the contemporary social theory.
Behaviorismo radical, epistemologia e problemas humanos
Jair Lopes Júnior
Psicologia: Ciência e Profiss?o , 1994, DOI: 10.1590/s1414-98931994000100007
Abstract:
Forty years of the first attempt at the electroweak unification and of the prediction of the weak neutral boson Z0
Leite Lopes J.
Brazilian Journal of Physics , 1999,
Abstract: The author describes his first attempt in 1958 at the unification of electromagnetic and weak interactions and his prediction in the same paper of the neutral Z0 boson which would be the intermediate quantum exchanged in an eventual electron-neutron weak interaction (as muonic neutrinos were not known at that time).
Minimum Number of Colors: the Turk's Head Knots Case Study
P. Lopes,J. Matias
Mathematics , 2010,
Abstract: The minimum number of colors is a challenging knot invariant since, by definition, its calculation requires taking the minimum over infinitely many minima. In this article we estimate and in some cases calculate the minimum number of colors for the Turk's head knots on three strands.
Minimum Number of Fox Colors for Small Primes
P. Lopes,J. Matias
Mathematics , 2010,
Abstract: This article concerns exact results on the minimum number of colors of a Fox coloring over the integers modulo r, of a link with non-null determinant. Specifically, we prove that whenever the least prime divisor of the determinant of such a link and the modulus r is 2, 3, 5, or 7, then the minimum number of colors is 2, 3, 4, or 4 (respectively) and conversely. We are thus led to conjecture that for each prime p there exists a unique positive integer, m, with the following property. For any link L of non-null determinant and any modulus r such that p is the least prime divisor of the determinant of L and the modulus r, the minimum number of colors of L modulo r is m.
As redes sociais do crime organizado: a perspectiva da nova sociologia econ?mica
Lopes Júnior, Edmílson;
Revista Brasileira de Ciências Sociais , 2009, DOI: 10.1590/S0102-69092009000100004
Abstract: this article deals with social networks, directly or indirectly, linked to the organized crime in brazil today. the analysis is based on the theoretical and methodological contributions of two of the most important theories in contemporary sociology: the analysis of networks and the new economic sociology. this analytic task is guided by the hypothesis that the best way to understand organized crime is one that takes it as a process situated on a continuum that goes from lawful activity to the criminal act. the empiric basis on which this sociological narrative is founded is supplied by the written reports of operations carried out by the federal police in the last three years and by a research already concluded on gangs specialized in robbing banks in the countryside of the brazilian northeast.
Measurement of Radio Emission from Extensive Air Showers with LOPES
J. R. Hoerandel,for the LOPES Collaboration
Physics , 2009, DOI: 10.1016/j.nima.2010.06.058
Abstract: A new method is explored to detect extensive air showers: the measurement of radio waves emitted during the propagation of the electromagnetic shower component in the magnetic field of the Earth. Recent results of the pioneering experiment LOPES are discussed. It registers radio signals in the frequency range between 40 and 80 MHz. The intensity of the measured radio emission is investigated as a function of different shower parameters, such as shower energy, angle of incidence, and distance to shower axis. In addition, new antenna types are developed in the framework of LOPES-Star and new methods are explored to realize a radio self-trigger algorithm in real time.
Two dimensional incompressible ideal flow around a small obstacle
D. Iftimie,M. C. Lopes Filho,H. J. Nussenzveig Lopes
Physics , 2002,
Abstract: In this article we study the asymptotic behavior of incompressible, ideal, time-dependent two dimensional flow in the exterior of a single smooth obstacle when the size of the obstacle becomes very small. Our main purpose is to identify the equation satisfied by the limit flow. We will see that the asymptotic behavior depends on $\gamma$, the circulation around the obstacle. For smooth flow around a single obstacle, $\gamma$ is a conserved quantity which is determined by the initial data. We will show that if $\gamma = 0$, the limit flow satisfies the standard incompressible Euler equations in the full plane but, if $\gamma \neq 0$, the limit equation acquires an additional forcing term. We treat this problem by first constructing a sequence of approximate solutions to the incompressible 2D Euler equation in the full plane from the exact solutions obtained when solving the equation on the exterior of each obstacle and then passing to the limit on the weak formulation of the equation. We use an explicit treatment of the Green's function of the exterior domain based on conformal maps, {\it a priori} estimates obtained by carefully examining the limiting process and the Div-Curl Lemma, together with a standard weak convergence treatment of the nonlinearity for the passage to the limit.
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