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Sao Paulo, Brazil

The São Paulo State Technological Colleges or FATECs are public institutions of higher education belonging to CEETEPS , governmental maintainer. The FATECs are important Brazilian institutions of higher education, being pioneers in the graduation of technologists. They are located in several cities of the São Paulo state, with three campuses in the capital , and several other units in the metropolitan region of São Paulo, countryside and seashore.The 46 FATECs offer high degree careers in virtually all areas of knowledge. In most of the units, are offered courses of higher education in technology, focused in the training of technologists. The units of São Caetano do Sul, Ourinhos, Carapicuíba and Americana, however, offer the option of bachelorship and licentiate degree in the career of System Analysis and Information Technology, starting the tradition of FATECs to train, too, bachelors and licentiates.More than 28 thousand students are currently enrolled in FATECs. For the formation of this quota is annually invested more than R$ 1 billion . Wikipedia.

Da Silva D.M.,Sao Paulo State Technological College | Kassab L.R.P.,Sao Paulo State Technological College | Siarkowski A.L.,University of Sao Paulo | De Araujo C.B.,Federal University of Pernambuco
Optics Express | Year: 2014

We report the fabrication of waveguide amplifiers produced by RF-sputtering, using a PbO-GeO2 glass (PGO glass) film codoped with Er3+/Yb3+. RIB waveguides were obtained from PGO thin films using optical lithography followed by reactive ion etching process. The optical losses in the waveguide were ∼1.0 dB/cm and the maximum internal gain at 1.53 μm, with excitation at 980 nm, was 3 dB/cm. Nanostructured gold films deposited on the waveguides enhanced the Er3+ ions photoluminescence (PL) by ∼400% in the red region and ∼30% in the infrared, under 980 nm pumping. The optical gain was enhanced and reached 6.5 dB/cm. The results demonstrate that the PGO waveguides, with or without gold nanoparticles, are promising for integrated photonics. © 2014 Optical Society of America.

Oliveira A.C.D.,Sao Paulo State Technological College | Kaminski P.C.,University of Sao Paulo
Technovation | Year: 2012

Along with the emergence of new competition rules, namely, the need to reduce the time to launch a product in the market and the capacity to modify and adapt it based on the identification of consumer choices, the approach of an interactive innovation model requires that small and medium industrial enterprises have a technological innovation strategy. This paper presents a support model to small and medium enterprises, starting from the diagnosis (definition of their degree of maturity) of technological innovation factors. This mapping aims to guide the technological innovation effort by offering a set of guidelines to be used, in this category of companies, as a strategy to select and manage the most suitable tools and technologies for the development of new products, according to their specific activities and contingencies. This reference model is exemplified by its application, using actual data, in industrial SMEs in the region of São Paulo, Brazil. A case study is also presented for the definition of the degree of maturity of an industrial SME of the metal-mechanical sector, including the resulting proposals of guidelines to the company. © 2012 Elsevier Ltd.

Vaveliuk P.,Sao Paulo State Technological College | Martinez-Matos O.,Complutense University of Madrid
Optics Express | Year: 2011

The limits of the paraxial approximation for a laser beam under ABCD transformations is established through the relationship between a parameter concerning the beam paraxiality, the paraxial estimator, and the beam second-order moments. The applicability of such an estimator is extended to an optical system composed by optical elements as mirrors and lenses and sections of free space, what completes the analysis early performed for free-space propagation solely. As an example, the paraxiality of a system composed by free space and a spherical thin lens under the propagation of Hermite-Gauss and Laguerre-Gauss modes is established. The results show that the the paraxial approximation fails for a certain feasible range of values of main parameters. In this sense, the paraxial estimator is an useful tool to monitor the limits of the paraxial optics theory under ABCD transformations. © 2011 Optical Society of America.

Vaveliuk P.,Sao Paulo State Technological College | Martinez-Matos O.,Complutense University of Madrid
Optics Express | Year: 2012

Negative propagation is an unusual effect concerning the local sign change in the Poynting vector components of an optical beam under free propagation. We report this effect for finite-energy Airy beams in a subwavelength nonparaxial regime. This effect is due to a coupling process between propagating and evanescent plane waves forming the beam in the spectral domain and it is demonstrated for a single TE or TM mode. This is contrary to what happens for vector Bessel beams and vector X-waves, for which a complex superposition of TE and TM modes is mandatory. We also show that evanescent waves cannot contribute to the energy flux density by themselves such that a pure evanescent Airy beam is not physically realizable. The break of the shape-preserving and diffraction-free properties of Airy beams in a nonparaxial regime is exclusively caused by the propagating waves. The negative propagation effect in subwavelength nonparaxial Airy beams opens new capabilities in optical traps and tweezers, optical detection of invisibility cloacks and selective on-chip manipulation of nanoparticles. © 2012 Optical Society of America.

Vaveliuk P.,Sao Paulo State Technological College | Vaveliuk P.,CONICET | Lencina A.,CONICET | Lencina A.,National University of La Plata | And 2 more authors.
Optics Letters | Year: 2014

In this Letter a new class of light beam arisen from the symmetrization of the spectral cubic phase of an Airy beam is presented. The symmetric Airy beam exhibits peculiar features. It propagates at initial stages with a single central lobe that autofocuses and then collapses immediately behind the autofocus. Then, the beam splits into two specular off-axis parabolic lobes like those corresponding to two Airy beams accelerating in opposite directions. Its features are analyzed and compared to other kinds of autofocusing beams; the superposition of two conventional Airy beams having opposite accelerations (in rectangular coordinates) and also to the recently demonstrated circular Airy beam (in cylindrical coordinates). The generation of a symmetric Airy beam is experimentally demonstrated as well. Besides, based on its main features, some possible applications are also discussed. © 2014 Optical Society of America.

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