2,238 research outputs found
Optical frequency tripling with improved suppression and sideband selection
Journal Article, Impact factor:3.749A novel optical dispersion tolerant millimetre-wave radio-over-fibre system using optical frequency tripling technique with enhanced and selectable sideband suppression is demonstrated. The implementation utilises cascaded optical modulators to achieve either an optical single sideband (OSSB) or double sideband-suppressed carrier (DSB-SC) signal with high sideband suppression. Our analysis and simulation results indicate that the achievable suppression ratio of this configuration is only limited by other system factors such as optical noise and drifting of the operational conditions. The OSSB transmission system performance is assessed experimentally by the transport of 4 WiMax channels modulating a 10 GHz optical upconverted RF carrier as well as for optical frequency doubling and tripling. The 10 GHz and tripled carrier at 30 GHz are dispersion tolerant resulting both in an average relative constellation error (RCE) of -28.7 dB after 40 km of fibre. (C)2011 Optical Society of AmericaFundação para a CiĂȘncia e Tecnologi
Optical Techniques for Defect Evaluation in Vehicles
The optical techniques are a powerful tool on situations where either the physical contact or
invasive techniques for evaluation are not suitable. Vehicle environments constitute an
application field for the optical techniques and are the focus of this chapter. In order to
reinforce this kind of techniques, it must be clarified that the idea to manipulate the light backs
to the second century before our age, when Archimedes planned to destroy enemy ships using
a solar heat ray with an array of actuators to change the shape of a mirror (Bifano T., 2011).
Therefore, the field of photonics is the one that offers the possibility to achieve one of the
greatest realizations and applications because the light is present in all aspects of the human
life and our way of living is impossible without light (Carmo J. P. et al., 2012a). Optical
measurement systems are also suitable for harsh monitorization because they are non-contact
and full-field techniques. This is the case of Moiré Interferometry, which is used for many
optoelectronic applications as displacement measurements (Wronkowski L., 1995), evaluation
of microelectronics devices deformation (Xie H. et al., 2004), optical communications (Chen L.
et al., 2000), strain measurements with Fiber Bragg Grattings, FBGs, (Silva A. F. et al., 2011) and
spectrography (Kong S. H. et al., 2001). In this context, it must be noted that the recent nuclear
disaster in Fukushima, Japan, confirms the need of tighter security measures be done within
harsh environments (which includes the automobiles) in order to increase both the safety of
people and the reliability of vehiclesâ parts
Active swarms on a sphere
Here we show that coupling to curvature has profound effects on collective
motion in active systems, leading to patterns not observed in flat space.
Biological examples of such active motion in curved environments are numerous:
curvature and tissue folding are crucial during gastrulation, epithelial and
endothelial cells move on constantly growing, curved crypts and vili in the
gut, and the mammalian corneal epithelium grows in a steady-state vortex
pattern. On the physics side, droplets coated with actively driven microtubule
bundles show active nematic patterns. We study a model of self-propelled
particles with polar alignment on a sphere. Hallmarks of these motion patterns
are a polar vortex and a circulating band arising due to the incompatibility
between spherical topology and uniform motion - a consequence of the hairy ball
theorem. We present analytical results showing that frustration due to
curvature leads to stable elastic distortions storing energy in the band.Comment: 5 pages, 4 figures plus Supporting Informatio
Fabrication methodology of microlenses for stereoscopic imagers using standard CMOS process
This paper presents the fabrication technology of microlenses
maintaining a high reproducibility of their characteristics with low
cost. The objective of microlenses is to be integrated into imagers
in CMOS technology to allow stereoscopic vision. The fabricated
microlenses form cylindrical arrays to be placed above the optical
filters and photodetectors, in order to potentiate stereoscopic vision
and at the same time maximizing the color fidelity. An array of
optical filters centered at the primary colors will enable a
multicolor usage. The AZ4562 material was the photoresist
selected for fabricating the microlenses. The cylindrical shape is
obtained by reflowing the photoresist using the hot-plate technique.This work and Rui Pedro Rocha were fully supported by the Portuguese Foundation for
Science and Technology under the project FCT/PTDC/EEA-ELC/109936/2009 and the
financial grant SFRH/BD/33733/2009, respectively
Phase diagram of a model for a binary mixture of nematic molecules on a Bethe lattice
We investigate the phase diagram of a discrete version of the Maier-Saupe
model with the inclusion of additional degrees of freedom to mimic a
distribution of rodlike and disklike molecules. Solutions of this problem on a
Bethe lattice come from the analysis of the fixed points of a set of nonlinear
recursion relations. Besides the fixed points associated with isotropic and
uniaxial nematic structures, there is also a fixed point associated with a
biaxial nematic structure. Due to the existence of large overlaps of the
stability regions, we resorted to a scheme to calculate the free energy of
these structures deep in the interior of a large Cayley tree. Both
thermodynamic and dynamic-stability analyses rule out the presence of a biaxial
phase, in qualitative agreement with previous mean-field results
Low-power low-voltage RF CMOS transceiver at 2.4 GHz
A radio-frequency transceiver chip was designed in a UMC RF 0.18 ”m CMOS process. The target RF frequency is 2.4 GHz ISM band. A possible application of this transceiver is the integration into textiles for sensing biomedical data. The power supply of the transceiver is 1.8 V. Simulations shown
power consumption less than 10 mW for the receiver
A 2.4-GHz CMOS short-range wireless-sensor-network interface for automotive applications
This paper describes a CMOS interface for shortrange
wireless sensor networks (CMOS-SRWSN interface). The
sensor interface is composed of a sensor readout, electronics
for processing and control, a memory, a radio-frequency CMOS
transceiver for operation in the 2.4-GHz industrial, scientific, and
medical bands, and a planar antenna. The receiver has a sensitivity
of â60 dBm and consumes 6.3 mW from a 1.8-V supply. The
transmitter delivers an output power of 0 dBm with a power
consumption of 11.2 mW. The application of the CMOS-SRWSN
interface is in the automotive industry for the reduction of cables
and to support the information, communication, and entertainment
systems in cars.
A 2.4-GHz RF CMOS transceiver for wireless sensor applications
A radio-frequency transceiver chip was designed in a UMC RF 0.18 ”m CMOS process. The target RF frequency is 2.4 GHz ISM band. The specifications are a sensibility of -60 dBm and a power transmission
of 0 dBm. The power supply of the transceiver is 1.8 V. Simulations show a power consumption of 10.7 mW. Innovative topics concerning efficient power management was taken into account during the design of the transceiver
2.4 GHz wireless sensor network for smart electronic shirts
This paper presents a wireless sensor network for smart electronic shirts. This allows the monitoring of individual
biomedical data, such the cardio-respiratory function. The solution chosen to transmit the bodyâs measured signals for further processing was the use of a wireless link, working at the 2.4 GHz ISM band. A radio frequency transceiver chip was
designed in a UMC RF 0.18 ”m CMOS process. The power supply of the transceiver is 1.8 V. Simulations show a power consumption of 12.9 mW. Innovative topics concerning efficient power management was taken into account during the design of the transceiver.(undefined
Circular Orbits in Einstein-Gauss-Bonnet Gravity
The stability under radial and vertical perturbations of circular orbits
associated to particles orbiting a spherically symmetric center of attraction
is study in the context of the n-dimensional: Newtonian theory of gravitation,
Einstein's general relativity, and Einstein-Gauss-Bonnet theory of gravitation.
The presence of a cosmological constant is also considered. We find that this
constant as well as the Gauss-Bonnet coupling constant are crucial to have
stability for .Comment: 11 pages, 4 figs, RevTex, Phys. Rev. D, in pres
- âŠ