A. Caseiro

article

EP22.13: “Paladini's fountain‐like hemorrhage”: an ultrasound ominous fetoplacental hemorrhage sign to be aware of

L.M. Frada, R. Ribeiro, C. Albuquerque, A. Lima, more

Ultrasound in Obstetrics & Gynecology > 54 > S1 > 381 - 382

chapter

Real-time multiple IGBT open-circuit fault diagnosis in three-level neutral-point-clamped converters with no additional sensors

L. M. A. Caseiro, A. M. S. Mendes

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society > 3181 - 3186

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society

Most diagnostic techniques in the literature focus on the occurrence of a single fault, which limits their functionality. This paper presents a real-time diagnostic algorithm for multiple IGBT open-circuit faults in three-level Neutral-Point-Clamped converters. The proposed algorithm is based on an indirect analysis of the converter pole voltage errors and requires no additional sensors, relying only...

chapter

Generalized IGBT open-circuit fault diagnosis algorithm with no additional sensors for grid-connected N-level NPC converters

L. M. A. Caseiro, A. M. S. Mendes

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society > 2421 - 2426

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society

This paper presents a real-time diagnostic algorithm for IGBT open-circuit faults in Neutral-Point-Clamped converters, generalized for the N-level case. This algorithm can thus be used in any NPC converter without adaptations, regardless of the number of levels. The algorithm is based on the estimated instant pole voltage error and requires no additional sensors, relying only on signals already available...

chapter

Open-circuit fault diagnosis in neutral-point-clamped UPS inverters with no additional sensors

L. M. A. Caseiro, A. M. S. Mendes

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society > 2463 - 2468

IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society

The operating conditions of UPS inverters and the fact that the load is unknown lead to great difficulties in fault diagnosis. This paper proposes the use of a fault diagnosis algorithm based on estimated pole voltage error for UPS inverters based on the 3-level Neutral-Point-Clamped topology. This algorithm is independent from the load and is not affected by unbalanced three-phase operation. This...

article

Real-Time IGBT Open-Circuit Fault Diagnosis in Three-Level Neutral-Point-Clamped Voltage-Source Rectifiers Based on Instant Voltage Error

Luis M. A. Caseiro, Andre M. S. Mendes

IEEE Transactions on Industrial Electronics > 2015 > 62 > 3 > 1669 - 1678

This paper presents a real-time diagnostic algorithm for insulated-gate bipolar transistor open-circuit faults in three-level neutral-point-clamped rectifiers. This algorithm is based on the instant voltage error in the converter and requires only signals already available to the control system, avoiding the use of additional hardware. The algorithm is independent from the load and from the used control...

chapter

Open-circuit fault diagnosis in Neutral-Point-Clamped active power filters based on instant voltage error with no additional sensors

L. M. A. Caseiro, A. M. S. Mendes, P. M. A. F. Lopes

2015 IEEE Applied Power Electronics Conference and Exposition (APEC) > 2217 - 2222

2015 IEEE Applied Power Electronics Conference and Exposition (APEC)

This paper proposes the use of a fault diagnosis algorithm based on instant voltage error for Neutral-Point-Clamped active power filters. This algorithm uses only signals already available to the filter controller and thus does not require any additional hardware. The algorithm is highly independent from the load and control technique. Very fast diagnostics and a high reliability are achieved by considering...

chapter

Fault tolerance in back-to-back three-level neutral-point-clamped induction motor drives

L M A Caseiro, A M S Mendes, S M A Cruz

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014) > 1 - 6

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

In this paper, the fault-tolerant capabilities of a back-to-back three-level Neutral-Point-Clamped induction motor drive are analysed. A strategy is proposed to manage fault-tolerant operation and the reconfiguration procedure, using minimal hardware expansion. This strategy includes diagnosis and tolerance solutions for IGBT open-circuit faults in both inverter and rectifier stages, thus guaranteeing...

article

OP05.07: Prenatal ultrasonography evaluation of an intracranial tumor: a case report

P. Pina, A. Caseiro

Ultrasound in Obstetrics & Gynecology > 42 > s1 > 61 - 61

chapter

Fault diagnosis and tolerance in three-level Neutral-Point-Clamped rectifiers

L. M. A. Caseiro, A. M. S. Mendes, Aderito N. Alcaso

IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society > 404 - 409

IECON 2012 - 38th Annual Conference of IEEE Industrial Electronics

Some of the main concerns in the use of power converters are their reliability and the ability to detect and maintain operation when in fault. Many techniques have been proposed to identify and respond to faults in Neutral-Point-Clamped converters. Most of these methods, however, require additional hardware and/or changes in the topology. In this paper, a NPC rectifier is investigated, including the...

article

Indoor and outdoor characterisation of organic and inorganic compounds in city centre and suburban elementary schools of Aveiro, Portugal

P.N. Pegas, T. Nunes, C.A. Alves, J.R. Silva, more

Atmospheric Environment > 2012 > 55 > Complete > 80-89

Pollutants inside school buildings may affect children's health and influence learning performance and attendance. This study investigated pollutant concentrations inside and outside school buildings at different locations (city centre and suburban) in Aveiro, Portugal, between April and June 2010. The aim was to evaluate simultaneously comfort parameters (temperature, relative humidity, CO ₂...

article

Burn wood influence on outdoor air quality in a small village: Foros de Arrão, Portugal

N. Canha, M. C. Freitas, M. Almeida-Silva, S. M. Almeida, more

Journal of Radioanalytical and Nuclear Chemistry > 2012 > 291 > 1 > 83-88

One Plus Sequential Air Sampler—Partisol was placed in a small village (Foros de Arrão) in central Portugal to collect PM₁₀ (particles with an aerodynamic diameter below 10 μm), during the winter period for 3 months (December 2009–March 2010). Particles masses were gravimetrically determined and the filters were analyzed by instrumental neutron activation analysis to assess their chemical composition...

article

Smoke emissions from biomass burning in a Mediterranean shrubland

C.A. Alves, C. Gonçalves, C.A. Pio, F. Mirante, more

Atmospheric Environment > 2010 > 44 > 25 > 3024-3033

Gaseous and particulate samples from the smoke from prescribed burnings of a shrub-dominated forest with some pine trees in Lousã Mountain, Portugal, in May 2008, have been collected. From the gas phase Fourier transform infrared (FTIR) measurements, an average modified combustion efficiency of 0.99 was obtained, suggesting a very strong predominance of flaming combustion. Gaseous compounds whose...

article

Quantifying emissions of primary biological aerosol particle mass in Europe

W. Winiwarter, H. Bauer, A. Caseiro, H. Puxbaum

Atmospheric Environment > 2009 > 43 > 7 > 1403-1409

Atmospheric concentration measurements of tracers for primary biological aerosol particles (PBAPs) have been used to obtain estimates of their release into the atmosphere. Emission flux data of surrogate compounds, for which concurrent concentration measurements were available, were used to quantify the release of PBAPs as PM ₁₀ mass. Results indicate fungal spores to be the most important...

article

Characterizing air particulate matter composition and sources in Lisbon, Portugal

S. M. Almeida, M. C. Freitas, C. Repolho, I. Dionísio, more

Journal of Radioanalytical and Nuclear Chemistry > 2009 > 281 > 2 > 215-218

The goal of this research is to determine trends and sources of airborne particulates in the centre of Lisbon, by using speciated particulate-matter data and back-trajectory analyses. Results showed that, in 2007, the annual PM_2.5 concentration exceeded the World Health Organization recommended levels. PM_2.5 diurnal variability and the ratio between weekdays’ and weekends’ concentrations indicated...

article

Characterisation of the seasonal exposure to air pollutants for a respiratory epidemiological study

M. C. Freitas, S. M. Almeida, A. M. G. Pacheco, I. Dionísio, more

Journal of Radioanalytical and Nuclear Chemistry > 2009 > 281 > 2 > 219-223

In 2006, elementary schools of inner-city Lisbon, Portugal were given questionnaires to identify respiratory problems. In 1,175 children aged 5–10 years, 27.7% reported rhinitis, 2.5% reported hay fever and 25.9% reported asthma symptoms. April and August were the months with higher incidence of rhinitis, with a considerable difference nonetheless (10.5% and 2.3%, respectively.). The former trends...

article

Evaluating children exposure to air pollutants for an epidemiological study

S. M. Almeida, M. C. Freitas, C. Repolho, I. Dionísio, more

Journal of Radioanalytical and Nuclear Chemistry > 2009 > 280 > 2 > 405-409

Recent health studies evidence that epidemiological studies must be combined with accurate analyses of the physico-chemical properties of the particles in order to determine the effects of atmospheric aerosols on human health. The project “Atmospheric Aerosol Impacts on Human Health” focuses on the chemical characterization of PM2.5 aerosols with the aim to analyze the health risks associated with...

article

Association between monthly-reported rhinitis by children from basic schools and monthly-averaged air pollutants, at Lisbon (Portugal)

M. C. Freitas, I. Dionísio, D. G. Beasley, S. M. Almeida, more

Journal of Radioanalytical and Nuclear Chemistry > 2009 > 282 > 1 > 15-20

The number of children reporting rhinitis by month is compared with air pollutant concentrations in Lisbon, where they live and attend school. INAA, ionic exchange chromatography and data accessed through the internet were statistically processed with the children rhinitis data. Association between rhinitis and atmospheric variables are processed using Spearman non-parametric statistics and principal...

article

Chemical composition of atmospheric aerosols during the 2003 summer intense forest fire period

C.A. Pio, M. Legrand, C.A. Alves, T. Oliveira, more

Atmospheric Environment > 2008 > 42 > 32 > 7530-7543

In Portugal, during summer 2003, unusually large forested areas (>300,000ha) were destroyed by fire, emitting pollutants to the atmosphere. During this period, aerosol samples were collected in the Aveiro region, and analysed for total mass and a set of inorganic and organic compounds, including tracers of biomass burning. Comparisons of aerosol size distributions, levels of particulate mass and...

chapter

The Titech large vocabulary WFST speech recognition system

Paul R. Dixon, Diamantino A. Caseiro, Tasuku Oonishi,, Sadaoki Furui,

2007 IEEE Workshop on Automatic Speech Recognition&Understanding (ASRU) > 443 - 448

2007 IEEE Workshop on Automatic Speech Recognition and Understanding

In this paper we present evaluations on the large vocabulary speech decoder we are currently developing at Tokyo Institute of Technology. Our goal is to build a fast, scalable, flexible decoder to operate on weighted finite state transducer (WFST) search spaces. Even though the development of the decoder is still in its infancy we have already implemented a impressive feature set and are achieving...

INFONA - science communication portal

Search results for: A. Caseiro

EP22.13: “Paladini's fountain‐like hemorrhage”: an ultrasound ominous fetoplacental hemorrhage sign to be aware of

Real-time multiple IGBT open-circuit fault diagnosis in three-level neutral-point-clamped converters with no additional sensors

Generalized IGBT open-circuit fault diagnosis algorithm with no additional sensors for grid-connected N-level NPC converters

Open-circuit fault diagnosis in neutral-point-clamped UPS inverters with no additional sensors

Real-Time IGBT Open-Circuit Fault Diagnosis in Three-Level Neutral-Point-Clamped Voltage-Source Rectifiers Based on Instant Voltage Error

Open-circuit fault diagnosis in Neutral-Point-Clamped active power filters based on instant voltage error with no additional sensors

Fault tolerance in back-to-back three-level neutral-point-clamped induction motor drives

OP05.07: Prenatal ultrasonography evaluation of an intracranial tumor: a case report

Fault diagnosis and tolerance in three-level Neutral-Point-Clamped rectifiers

Indoor and outdoor characterisation of organic and inorganic compounds in city centre and suburban elementary schools of Aveiro, Portugal

Burn wood influence on outdoor air quality in a small village: Foros de Arrão, Portugal

Smoke emissions from biomass burning in a Mediterranean shrubland

Quantifying emissions of primary biological aerosol particle mass in Europe

Characterizing air particulate matter composition and sources in Lisbon, Portugal

Characterisation of the seasonal exposure to air pollutants for a respiratory epidemiological study

Evaluating children exposure to air pollutants for an epidemiological study

Association between monthly-reported rhinitis by children from basic schools and monthly-averaged air pollutants, at Lisbon (Portugal)

Chemical composition of atmospheric aerosols during the 2003 summer intense forest fire period

The Titech large vocabulary WFST speech recognition system

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