671 research outputs found
Event-Triggered Observers and Observer-Based Controllers for a Class of Nonlinear Systems
In this paper, we investigate the stabilization of a nonlinear plant subject
to network constraints, under the assumption of partial knowledge of the plant
state. The event triggered paradigm is used for the observation and the control
of the system. Necessary conditions, making use of the ISS property, are given
to guarantee the existence of a triggering mechanism, leading to asymptotic
convergence of the observer and system states. The proposed triggering
mechanism is illustrated in the stabilization of a robot with a flexible link
robot.Comment: Proceedings of the 2015 American Control Conference - ACC 201
The identification of multiple thrombophilic risk factors in an infant with cerebrovascular accident
We found 1 article:
Rev Neurol. 2005 Apr 16-30;40(8):479-81.
[The identification of multiple thrombophilic risk factors in an infant with cerebrovascular accident]
[Article in Spanish]
Neves J, Costa E, Branca R, Carrilho I, Barbot J, Barbot C.
Servicio de HematologÃa, Hospital de Crianças Maria Pia, 4050-111 Porto, Portugal.
Abstract
INTRODUCTION: Neonatal stroke (NNS) incidence appears to be increasing over the last years. This is believed to be a consequence of diagnostic accuracy rather than a real amplification of this entity. Nowadays, NNS incidence is estimated to be 1:4000 full newborns.
CASE REPORT: Child with left middle cerebral artery territory infarction in which several thromboembolic risk factors were documented both in the child (neonatal sepsis and factor V Leiden) and his mother (lupus anticoagulant, pre-eclampsy and factor V Leiden).
CONCLUSIONS: This case supports the increasing evidence in recent reports that association of multiple prothrombotic risk factors (maternal and foetal) is present in NNS genesis. This way the authors agree that wide prothrombotic study may be of crucial interest in identifying subjacent thrombophilic disease, even when an exogenous risk factor is present.
PMID: 15861329 [PubMed - indexed for MEDLINE
A robust sensorless output feedback controller of the induction motor drives: New design and experimental validation
International audienceIn this paper, a sensorless output feedback controller is designed in order to drive the Induction Motor IM without the use of flux and speed sensors. Firstly, an observer that uses only the measured stator currents is synthesized to estimate the mechanical variables (speed and load torque) and the magnetic variables (fluxes) by structurally taking into account the unobservability phenomena of the Sensorless IM (SIM) and the parametric uncertainties. Secondly, a current-based field oriented sliding mode control, that uses the flux and the speed estimates given by the former observer is developed so as to steer the estimated speed and flux magnitude to the desired references. Since the observer design is independent of the control and depends on theIM parametric uncertainties, a separation principle is introduced to guarantee the practical stability of the whole closed-loop system "observer -controller" ("O-C") according to observability and unobservability time variation. A significant benchmark taking into account the unobservability phenomena of the \textit{SIM} is presented to show the performances of the whole control scheme against experimental set-up
Utilização de sensores e dos sentidos humanos no apoioà transição do concretopara o abstrato
Apresentam-se e analisam-se os contributos de 4 estudos de caso para a compreensão do potencial da utilização sinérgica dos sentidos e de sensores no apoio à transição do pensamento concreto para o abstrato, em contextos de ensino experimental das ciências no 1º e 2º ciclo do ensino básico. Recolheram-se e analisaram-se evidências de desenvolvimento da abstração sobre tópicos de considerável complexidade, como os de biodiversidade, ser vivo, temperatura e frequência cardÃaca
Collisions of particles in locally AdS spacetimes I. Local description and global examples
We investigate 3-dimensional globally hyperbolic AdS manifolds containing
"particles", i.e., cone singularities along a graph . We impose
physically relevant conditions on the cone singularities, e.g. positivity of
mass (angle less than on time-like singular segments). We construct
examples of such manifolds, describe the cone singularities that can arise and
the way they can interact (the local geometry near the vertices of ).
We then adapt to this setting some notions like global hyperbolicity which are
natural for Lorentz manifolds, and construct some examples of globally
hyperbolic AdS manifolds with interacting particles.Comment: This is a rewritten version of the first part of arxiv:0905.1823.
That preprint was too long and contained two types of results, so we sliced
it in two. This is the first part. Some sections have been completely
rewritten so as to be more readable, at the cost of slightly less general
statements. Others parts have been notably improved to increase readabilit
Collisions of particles in locally AdS spacetimes II Moduli of globally hyperbolic spaces
We investigate 3-dimensional globally hyperbolic AdS manifolds containing
"particles", i.e., cone singularities of angles less than along a
time-like graph . To each such space we associate a graph and a finite
family of pairs of hyperbolic surfaces with cone singularities. We show that
this data is sufficient to recover the space locally (i.e., in the neighborhood
of a fixed metric). This is a partial extension of a result of Mess for
non-singular globally hyperbolic AdS manifolds.Comment: 29 pages, 3 figures. v2: 41 pages, improved exposition. To appear,
Comm. Math. Phys. arXiv admin note: text overlap with arXiv:0905.182
Second order sliding mode and adaptive observer for synchronization of a chaotic system: a comparative study
International audienceIn this paper two nonlinear observers for a chaotic system are compared. Moreover, the left invertible problem and the observability singularity are discussed. Thus, after a presentation of both observers, a comparison of the two proposed methods and a discussion are done on the basis of simulations results. The last part highlights the fact that the finite time observer is more sensible to the singularity observations, but less sensible to parameter uncertainties and noise in the output of the system
Atypical haemolytic-uraemic syndrome caused by factor H mutation: case report and new management strategies in children
Atypical haemolytic uraemic syndrome is causedby alternative complement pathway dysregulation. It has recently been recognised that most cases are due to genetic factors and a growing list of mutations has been described. Atypical haemolytic uraemic syndrome is associated with a dismal prognosis, a relapsing course, high acute mortality and frequent progression to end-stage renal disease.
We describe a five-year-old boy admitted with a first recurrence of atypical haemolytic uraemic syndrome. The primary onset of the disease was at 15 months of age, following which there was complete recovery of haematological and renal parameters. His family history was significant in that his mother had died at the age of only 23 years of a stroke with associated thrombotic microangiopathy, suggesting a familial form of the disease. Sequencing of the gene encoding complement factor H revealed a heterozygous SCR20 mutation (3644G>T, Arg1215Leu), confirming the diagnosis. The patient was successfully treated with fresh frozen plasma infusions that induced disease remission.
We also review currently evolving concepts about atypical haemolytic uraemic syndrome caused by factor H mutation, its diagnosis, the role of genetic testing and management strategies in children
Towards a sanitation safety plan in the city of braga
A gestão integrada das infra-estruturas urbanas de água e saneamento constitui um desafio das cidades
ambientalmente sustentáveis. Alguns avanços no controlo de qualidade dos sistemas de abastecimento
de água para consumo humano, baseado em avaliação e gestão de riscos para a saúde pública, têm sido
conseguidos através da implementação de planos de segurança da água. Com base nesta metodologia
propõem-se, neste trabalho, contributos para a implementação de planos de segurança de saneamento,
cobrindo-se, desta forma, todo o ciclo urbano da água com princÃpios de gestão de riscos. Com esta
abordagem, estrutura-se um plano de segurança de saneamento onde são identificados eventos
perigosos, avaliados e priorizados riscos para a saúde pública e para o ambiente, assim como se
estabelecem medidas de controlo ao longo de todo o sistema de saneamento, percorrendo todas as
etapas que o constituem: recolha, tratamento, lançamento no ambiente e reutilização segura de águas
residuais. Estes conceitos foram aplicados ao sistema de saneamento da área central da cidade de
Braga, para o qual se criou expressamente uma ferramenta informática de suporte, focada nos módulos
principais da estrutura de um plano de segurança de saneamento.The integrated management of urban water and sanitation infrastructure is a challenge for
environmentally sustainable cities. Positive developments in quality control in drinking water supply
systems, based on risk assessment and risk management for public health, have been achieved through
the implementation of water safety plans. Based on this methodology, the present work gives
contributions for sanitation safety plans implementation. In this way, the urban water cycle is covered
with risk management principles. With this approach, a sanitation safety plan is structured in which
hazardous events to public health and environment are identified. Also risk assessment, risk
prioritization and control measures are established throughout the sanitation system, covering all its
steps: collection, treatment, disposal in receiving waters and safe reuse of treated wastewater. These
concepts have been applied to the sanitation system of the central area of the city of Braga, for which a
support software tool was expressly created, focusing in the core structural modules of a sanitation
safety plan
Technical advances in near real time seafloor monitoring implemented for the momar-d project
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