2,649 research outputs found
Aspectos processuais da recuperação judicial
Divulgação dos SUMÁRIOS das obras recentemente incorporadas ao acervo da Biblioteca
Ministro Oscar Saraiva do STJ. Em respeito à lei de Direitos Autorais, não disponibilizamos a
obra na íntegra.Localização na estante: 347.736(81) B277
A Flexible Piezoresistive/Self-Capacitive Hybrid Force and Proximity Sensor to Interface Collaborative Robots
Force and proximity sensors are key in robotics, especially when applied in
collaborative robots that interact physically or cognitively with humans in
real unstructured environments. However, most existing sensors for use in
robotics are limited by: 1) their scope, measuring single parameters/events and
often requiring multiple types of sensors, 2) being expensive to manufacture,
limiting their use to where they are strictly necessary and often compromising
redundancy, and 3) have null or reduced physical flexibility, requiring further
costs with adaptation to a variety of robot structures. This paper presents a
novel mechanically flexible force and proximity hybrid sensor based on
piezoresistive and self-capacitive phenomena. The sensor is inexpensive and
easy to apply even on complex-shaped robot structures. The manufacturing
process is described, including controlling circuits, mechanical design, and
data acquisition. Experimental trials featuring the characterisation of the
sensor were conducted, focusing on both force-electrical resistance and
self-capacitive proximity response. The sensor's versatility, flexibility,
thinness (1 mm thickness), accuracy (reduced drift) and repeatability
demonstrated its applicability in several domains. Finally, the sensor was
successfully applied in two distinct situations: hand guiding a robot (by touch
commands), and human-robot collision avoidance (by proximity detection)
On Dirac-like Monopoles in a Lorentz- and CPT-violating Electrodynamics
We study magnetic monopoles in a Lorentz- and CPT-odd electrodynamical
framework in (3+1) dimensions. This is the standard Maxwell model extended by
means of a Chern-Simons-like term, (
constant), which respects gauge invariance but violates both Lorentz and CPT
symmetries (as a consequence, duality is also lost). Our main interest concerns
the analysis of the model in the presence of Dirac monopoles, so that the
Bianchi identity no longer holds, which naively yields the non-conservation of
electric charge. Since gauge symmetry is respected, the issue of charge
conservation is more involved. Actually, the inconsistency may be circumvented,
if we assume that the appearance of a monopole induces an extra electric
current. The reduction of the model to (2+1) dimensions in the presence of both
the magnetic sources and Lorentz-violating terms is presented. There, a
quantization condition involving the scalar remnant of , say, the mass
parameter, is obtained. We also point out that the breaking of duality may be
associated with an asymmetry between electric and magnetic sources in this
background, so that the electromagnetic force experienced by a magnetic pole is
supplemented by an extra term proportional to , whenever compared to the
one acting on an electric charge.Comment: 10 pages, no figures, typed in te
Evaluation of genotype resistance testing for salvage antiretroviral therapy at AIDS care centers from Ribeirão Preto, São Paulo, Brazil
The availability of HIV-1 genotype resistance testing (GRT) to clinicians has been insufficiently studied outside randomized clinical trials. The present study evaluated the outcome of salvage antiretroviral therapy (ART) recommended by an expert physician based on GRT in a non-clinical trial setting in Ribeirão Preto, Brazil. A prospective, open, nonrandomized study evaluating easy access to GRT at six Brazilian AIDS Clinics was carried out. This cooperative study analyzed the efficacy of treatment recommended to patients whose salvage ART was guided by GRT with that of treatment with ART based only on previous ART history. A total of 112 patients with ART failure were included in the study, and 77 of them were submitted to GRT. The median CD4 cell count and viral load for these 77 patients at baseline were (mean ± SD) 252.1 ± 157.4 cells/µL and 4.60 ± 0.5 log10 HIV RNA copies/mL, respectively. The access time, i.e., the time elapsed between ordering the GRT and receiving the result was, on average, 71.9 ± 37.3 days. The study results demonstrated that access to GRT followed by expert recommendations did not improve the time to persistent treatment failure when compared to conventional salvage ART. Access to GRT in this Brazilian community health care setting did not improve the long-term virologic outcomes of HIV-infected patients experiencing treatment failure. This result is probably related to the long time required to implement ART guided by GRT
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