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Search Results: 1 - 10 of 26426 matches for " Jorge Neves "
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First Aerial South Atlantic Night Crossing  [PDF]
Fernando Neves, Jorge Barata, André Silva
Advances in Historical Studies (AHS) , 2016, DOI: 10.4236/ahs.2016.51003
Abstract: The history of the transatlantic flights began in 1919 when Albert C. Read’s team flew between Newfoundland and Lisbon, with a stopover at Azores, for fuel and repairs. The flight was made following a chain of 60 U.S. warships in order to guide it along its route and to provide assistance if needed. Two weeks later, John Alcock and Sir Arthur Whitten Brown made the first nonstop transatlantic flight from Newfoundland to County Galway, Ireland, covering more than 3000 km in just 16 hours of flight. In 1922, Gago Coutinho and Sacadura Cabral crossed the South Atlantic Ocean by air, for the first time using only internal means of navigation: a modified sextant and a course corrector; both devices proved its effectiveness. The Portuguese Aeronautics rejoiced auspicious days that time, with its aviation pioneers trying consecutively to reach more distant places along intercontinental flights. Several Around-the-World Flight Attempts were made in 1924: United States, England, France, Portugal, Argentina and Italy. However the circumnavigation purpose was only officially confirmed before the general public, when a considerable flying progress was achieved. In 1923, Gago Coutinho and Sacadura Cabral were contemplating to perform an Around the World Flight, a dream pursued also by Sarmento de Beires in 1924 and 1927. In 1927 and by following the knowledge obtained by Coutinho and Cabral, four Portuguese Airmen started an Around the World Flight Attempt in a mission that ended with seaplane sunk at the Ocean; however this mission was renamed after the seaplane loss and became known in the World as the First Aerial South Atlantic Night Crossing. For the first time in history, during the night of 16 to 17 March 1927, a Portuguese crew flew 2595 km over the Atlantic Ocean from Guinea, Africa to Fernando de Noronha Island, Brazil. The flight was made only by astronomical processes navigation resources that proved again to be absolutely feasible and trustworthy, regardless day or night lighting conditions.
Unprojection and deformations of tertiary Burniat surfaces
Jorge Neves,Roberto Pignatelli
Mathematics , 2011,
Abstract: We construct a 4-dimensional family of surfaces of general type with p_g=0 and K^2=3 and fundamental group Z/2xQ_8, where Q_8 is the quaternion group. The family constructed contains the Burniat surfaces with K^2=3. Additionally, we construct the universal coverings of the surfaces in our family as complete intersections on (\PP^1)^4 and we also give an action of Z/2xQ_8 on (\PP^1)^4 lifting the natural action on the surfaces. The strategy is the following. We consider an \'etale (Z/2)^3-cover T of a surface with p_g=0 and K^2=3 and assume that it may be embedded in a Fano 3-fold V. We construct V by using the theory of parallel unprojection. Since V is an Enriques--Fano 3-fold, considering its Fano cover yields the simple description of the universal covers above.
Codes over a weighted torus
Eduardo Dias,Jorge Neves
Mathematics , 2013,
Abstract: We define weighted projective Reed-Muller codes over a subset of weighted projective space over a finite field. We focus on the case when the set X is a projective weighted torus. We show that the vanishing ideal of X is a lattice ideal and relate it with the lattice ideal of a minimal presentation of the semigroup algebra of Q, the numerical semigroup generated by the weights of the projective space. We compute the index of regularity of the vanishing ideal as function of the weights and the Frobenius number of Q. We compute the basic parameters of weighted projective Reed-Muller codes over a 1-dimensional weighted torus and prove they are maximum distance separable codes.
The History of Aviation Education and Training  [PDF]
Jorge M. M. Barata, Fernando M. S. P. Neves
Open Journal of Applied Sciences (OJAppS) , 2017, DOI: 10.4236/ojapps.2017.74017
Abstract: Aviation education and training began early in the 20th century just after the first successful powered flight of the Wright brothers. In the present paper, the types of aviation education and training around the world are reviewed. Its developments were distinct in many different countries, and in some cases evolved from the military needs while in others from the dedication of a few enthusiasts. In the 21st century aeronautical and aerospace engineering is taught at the most advanced engineering schools in the world providing skills and competences that integrate advanced disciplines.
Jorge Tadeu de Ramos Neves
Revista Gest?o & Tecnologia , 2010,
Abstract: Está no ar o novo número da revista Gest o & Tecnologia apresentando oito artigos inéditos que tratam de temas relacionados com as diferentes vis es da Administra o moderna.
A construction of numerical Campedelli Surfaces with \Z/6 torsion group
Jorge Neves,Stavros Argyrios Papadakis
Mathematics , 2007,
Abstract: We produce a family of numerical Campedelli surfaces with \Z/6 torsion by constructing the (Gorenstein codimension 5) canonical ring of the \'{e}tale six to one cover using serial unprojection. In Section 2 we develop the necessary algebraic machinery. Section 3 contains the numerical Campedelli surface construction, while Section 4 contains remarks and open questions.
Parallel Kustin--Miller unprojection with an application to Calabi--Yau geometry
Jorge Neves,Stavros Argyrios Papadakis
Mathematics , 2009, DOI: 10.1112/plms/pds036
Abstract: Kustin--Miller unprojection constructs more complicated Gorenstein rings from simpler ones. Geometrically, it inverts certain projections, and appears in the constructions of explicit birational geometry. However, it is often desirable to perform not only one but a series of unprojections. The main aim of the present paper is to develop a theory, which we call parallel Kustin--Miller unprojection, that applies when all the unprojection ideals of a series of unprojections correspond to ideals already present in the initial ring. As an application of the theory, we explicitly construct 7 families of Calabi--Yau 3-folds of high codimensions.
Vanishing ideals over complete multipartite graphs
Jorge Neves,Maria Vaz Pinto
Mathematics , 2013,
Abstract: We study the vanishing ideal of the parametrized algebraic toric associated to the complete multipartite graph $\G=\mathcal{K}_{\alpha_1,...,\alpha_r}$ over a finite field of order $q$. We give an explicit family of binomial generators for this lattice ideal, consisting of the generators of the ideal of the torus, (referred to as type I generators), a set of quadratic binomials corresponding to the cycles of length 4 in $\G$ and which generate the \emph{toric algebra of $\G$} (type II generators) and a set of binomials of degree $q-1$ obtained combinatorially from $\G$ (type III generators). Using this explicit family of generators of the ideal, we show that its Castelnuovo--Mumford regularity is equal to $\max\set{\alpha_1(q-2),...,\alpha_r(q-2), \lceil (n-1)(q-2)/2\rceil}$, where $n=\alpha_1+... + \alpha_r$.
Perfil do administrador de clínica oftalmológica na Grande S?o Paulo
Neves, Jorge Wilson Nogueira;Maia, Marcio Boaventura;
Arquivos Brasileiros de Oftalmologia , 2003, DOI: 10.1590/S0004-27492003000700024
Abstract: purpose: to check the profile of the ophthalmology clinic administrator in great s?o paulo. methods: several questionnaires were sent to clinics at random. sex, age, schooling, graduate and postgraduate courses, partnership in the clinic, working hours, career plan, payment system and the amount of appointments per month in the clinic. results: 55% of them were men, and 60% of them were 30 to 59 years old. for 60% of them, this was their first experience in the area. 56% were in charge of clinics with more than 1,000 appointments per month. among those with college degrees (70%), 56% had a degree in business administration. half of the researched people had post-graduate courses, and the most frequent were hospital administration (40%) and mba (30%). only 10% were partners in the clinic. 75% work more than 40 hours per week. at present 60% are not attending specific courses and 56% think that it is the clinic's responsibility to incentive their careers. benefits: 75% have private health insurance and/or are registered workers. earning: salary with participation in the clinic's income (48%) and a fixed salary (42%). conclusions: in this study we found the profession of administrator of clinics being structured, with the participation of male and female professionals, graduated in business administration, some with post-graduate courses on a related subject, working over 40 hours per week, thinking that the clinic should invest in their professional growth. further research is required for a better understanding of this professional.
"Delineamento duplo central composto com 29 pontos"
Conagin, Armando;Jorge, Joassy de Paula Neves;
Bragantia , 1979, DOI: 10.1590/S0006-87051979000100023
Abstract: the double central composite design with 29 points rcpresents an extension of the central composite design and was developed for the study of three factors in more than three levels. essentially it is composed of two 23 factorials (levels 1 and b), of two stars (levels a and 2a) and of one central point. in the present paper the origin of the design, the double central composite completely randomized not orthogonal in 5 levels (-2, -1, 0, +1 and +2), the completely randomized design, orthogonal, in nine levels (-3.02; -2.00; -1.51; -1.00; 0.00; + 1.00; +1.51; +2.00; +3.02) and the orthogonal design divided in two blocks (levels -7.262; -4.391; -3.631; -1.000; 0.000; +1.000; +3.631; +4.391 and +7.262) are shown. one example of the late design is presented with its correspondent analysis. according with box and wilson criterion, this last design is more efficient than the 3 x 3 x 3 factorial. they can be used in fertilizer programs aiming the most efficient economical recommendation of dosages and in other areas of scientific research in which we want to evaluate the surface response equations and its extremum properties looking at the maximum response.
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