Voltage regulation in power distribution substation transformer using fuzzy implementation

Este trabalho apresenta um controlador fuzzy para realizar o ajuste automático de tensão em transformadores de subestação de distribuição de energia elétrica. Tal controle atuará em tempo-real nos transformadores dotados de comutadores de tap sob carga. O sistema inteligente foi empregado para tornar o relé regulador de tensão adaptativo. Ainda como foco do estudo, pretende-se atuar apenas na subestação de distribuição, realizando medições no barramento secundário e implementando ações de controle também neste barramento. A capacidade dos sistemas fuzzy em tratar incertezas, assim como sua habilidade em interpretar informações qualitativas, permitiu a formulação de uma estratégia de controle de tensão que atende a todas as regulamentações dos órgãos fiscalizadores brasileiros e, também, os anseios das concessionárias de distribuição frente aos aspectos relacionados com a qualidade de energia, pois os resultados obtidos foram bem satisfatórios.A fuzzy controller is introduced in this paper in order to make the voltage adjustment in power distribution substation transformer. The real-time controller in each case would act on power transformers equipped with under-load tap changers. Learning systems are employed to turn the voltage-control relays into adaptive devices. The scope of the present study has been limited to the power distribution substation, and both the voltage measurements and control actions are carried out on the secondary bus. The capacity of fuzzy systems to handle approximate data, together with their unique ability to interpret qualitative information, make it possible to design voltage control strategies that satisfy both the requirements of the Brazilian regulatory bodies and the real concerns of the electric power distribution companies in relation to the aspects involved with power quality, since the test results were highly satisfactory.FAPES

Nesting patterns of bees (Apidae) in brick walls in southern Brazil

Aiming to verify the nesting pattern of solitary bee species, a study was performed (October 2012 to March 2013) in Joinville, SC, southern Brazil, along a brick wall. There were found the following species Melitoma segmentaria (Emphorini), Caenohalictus incertus (Halictini)and Leiopodus lacertinus (Protepeolini). 147 nests showed activity in the sampling period (118 of C. incertus, 29 of M. segmentaria), 98% located in the masonry. For M. segmentaria, 29 active nests were observed (density of 4.53/ m2), with an average distance of 12.22 cmbetween them, 17 nests between the ground and 90 cm high, istributed in aggregated form (R = 0.004, p <0.02). The nests opening measured on average 0.9 cm in diameter (n =29), two of them with a mud tower entrance 0.6 cm high, with a smooth inner wall and a outer, rough. For C. incertus, 118 active nests were observed (density of 18.43/ m2), with a mean distance of 8.18 cm from each other, 98 nests between the ground and 70 cm high, distributed in aggregated form (R = 0.066, p <0.09). Individuals of L. lacertinus were noticed in all observations days, at the entrance of nests of M. segmentaria. Anthrax cf. virgo emerged from M. segmentaria nests

Labyrinthine fístulae in chronic otitis media with cholesteatoma

The chronic otitis media with cholesteatoma (COMC) may evoluate to intracranial and extra cranial complications, including the labyrithine fístulae. In this study, we present the evolution of our patients with labyrinthine fístulae. STUDY DESIGN: Clinical prospective. MATERIAL AND METHOD: Ten out 82 patients with COMC had labyrinthine fístulae and underwent surgery from January/2001 to April/2002. They were assessed by clinical exam, computed tomography scans, and pre and postoperative audiogram. RESULTS: Hearing loss, otorrhea, tinnitus and dizziness were present in 100%, 90%,80%, and 40% of the cases. In one patient the fístulae was seen only in the coronal CT-scan, in another patient the fístulae was not seen neither in coronal nor axial images. Among the patients who had tinnitus, 66% referred improvement of this complaint after surgery. DISCUSSION: in the cases without invasion of the perilymphatic space, we noticed a tendency of improvement of the postoperative audiogram pattern and clinical outcome. In the extensive fístulae, on the other hand, there were no clinical changes. CONCLUSION: The CT-scan remains the best exam to assess the COMC with 90% of sensitivity for labyrinthine fístulae. In the stage II we had a good postoperative outcome.A otite média crônica colesteatomatosa (OMCC) pode cursar com complicações intra e/ou extracranianas, entre elas a fístula labiríntica. Neste trabalho, mostramos a incidência e a evolução dos casos de fístula labiríntica decorrentes da OMCC em nosso serviço. FORMA DE ESTUDO: Clínico prospectivo. MATERIAL E MÉTODO: Dez pacientes com fístula labiríntica, do total de 82 pacientes com OMCC, foram submetidos à cirurgia no período de janeiro de 2001 a abril de 2002 e avaliados através de exame otorrinolaringológico completo, tomografia computadorizada e audiometria pré e pós-operatória. RESULTADOS: Perda auditiva, otorréia, zumbido e vertigem estavam presentes em 100%, 90%, 80% e 40% dos casos respectivamente na avaliação clínica pré-operatória. Em um paciente a fístula aparecia apenas nos cortes tomográficos coronais e tivemos um caso de falso-negativo. Dos pacientes com zumbido, 66% apresentaram melhora deste quadro no pós-operatório. DISCUSSÃO: Nos casos de fístula sem invasão do espaço perilinfático (até grau II), notamos uma tendência de melhora dos quadros clínico e audiométrico após a cirurgia. Nas fístulas extensas, por outro lado, o resultado audiométrico se manteve inalterado. CONCLUSÃO: A tomografia continua sendo o exame de escolha para os quadros de OMCC com sensibilidade de 90% para fístulas labirínticas. Nas fístulas grau II a cirurgia apresenta bom resultado funcional.Universidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Departamento de Otorrinolaringologia e Distúrbios da Comunicação HumanaUNIFESP, EPM, Depto. de Otorrinolaringologia e Distúrbios da Comunicação HumanaSciEL

Efeito do genótipo sobre a produção e composição do leite de cabras mestiças.

O potencial de produção de trinta e cinco cabras mestiças - 12 ½Pardo-alpina + ½Moxotó (½PA-M), 11 ¾ Pardo- alpina + ¼ Moxotó (3/4 PA-M) e 12 Tricross (½Anglo-nubiana + ¼ Pardo-alpina + ¼ Moxotó) - foi avaliado em um experimento foi conduzido na Embrapa Caprinos. Os cabritos foram separados das respectivas mães ao nascimento. As cabras foram ordenhadas duas vezes ao dia e o controle leiteiro procedido semanalmente. Os animais foram confinados em baias coletivas e receberam dieta para produção de 2,5 kg de leite/dia, composta de silagem de sorgo ad libitum e concentrado. Os animais foram pesados em intervalos d 14 dias. A produção de leite; como coletada, não foi influenciada pelo genótipo. No entanto, quando foi corrigida para 4% de gordura, o genótipo ½ PA-M foi superior aos 3/4 PA-M e Tricross. Não houve diferença significativa entre genótipos para gordura, proteína e extrato seco total do leite. [Effect of genotype on milk yield and composition of crossbred goats]. Abstract: The objective of this trial was to study the production of thirty-five crossbred goats: (1/2)Brown Alpine x 12 11 (2)Moxoto ((1/2)BA-M), 11 (3/4)Brown Alpine x (1/4)Moxoto ((3/4)BA-M), and 12 Tricross ((1/2)Anglo Nubian x (1/4)Moxoto x (1/4)Brown Alpine). After birth, the kids were separated from their mothers. Goats were milked twice a day and milk composition determined weekly. Animals were housed in collective pens and received a diet composed of sorghum silage (ad libitum) plus concentrate that were formulated to allow 2.5 kg/d of milk yield. Animals were weighted every 14 days. Milk production did not differ among genotypes. However, 4% fat corrected milk was greater for (1/2)BA-M than the remaining groups. No significant differences were observed for milk composition (fat, protein, and total solids) across genotypes in the current trial

Active galactic nuclei signatures in Red Geyser galaxies from Gemini GMOS-IFU observations

Red Geysers are quiescent galaxies with galactic scale ionized outflows, likely due to low-luminosity active galactic nuclei (AGN). We used Gemini GMOS-IFU observations of the inner~1–3 kpc of nine Red Geysers selected from the MaNGA survey to study the gas ionization and kinematics. The emission-line ratios suggest the presence of Seyfert/LINER (Low Ionization Nuclear Emission Region) nuclei in all sources. Two galaxies show Hα equivalent width ( Hα EW) larger than 3 Å (indicative of AGN ionization) within an aperture 2 . 5 of diameter (1.3–3.7 kpc at the distance of galaxies) for MaNGA data, while with the higher resolution GMOS data, four galaxies present Hα EW>3 Å within an aperture equal to the angular resolution (0.3–0.9 kpc). For two objects with GMOS-IFU data, the Hα EW is lower than 3 Å but larger than 1.5 Å, most probably due to a faint AGN. The spatially resolved electron density maps show values between 100 and 3000 cm −3 and are consistent with those determined in other studies. The large (MaNGA) and the nuclear scale (GMOS-IFU) gas velocity fields are misaligned, with a kinematic position angle difference between 12◦ and 60◦. The [N II] λ6583 emission-line profiles are asymmetrical, with blue wings on the redshifted side of the velocity field and red wings on the blueshifted side. Our results support previous indications that the gas in Red Geysers is ionized by an AGN, at least in their central region, with the presence of outflows, likely originating in a precessing accretion disc

The first 62 AGN observed with SDSS-IV MaNGA – IV. Gas excitation and star formation rate distributions

We present maps of the ionized gas flux distributions, excitation, star formation rate (SFR), surface mass density ΣH+, and obtain total values of SFR and ionized gas masses M for 62 active galactic nuclei (AGN) observed with SDSS-IV MaNGA and compare them with those of a control sample of 112 non-active galaxies. The most luminous AGN – with L([OIII]λ5007)≥3.8×1040ergs−1, and those hosted by earlier type galaxies are dominated by Seyfert excitation within 0.2 effective radius Re from the nucleus, surrounded by LINER excitation or transition regions, while the less luminous and hosted by later-type galaxies show equally frequent LINER and Seyfert excitation within 0.2Re. The extent R of the region ionized by the AGN follows the relation R∝L([OIII])0.5 – as in the case of the broad-line region. The SFR distribution over the region ionized by hot stars is similar for AGN and controls, while the integrated SFR – in the range 10−3–10 M⊙ yr−1 is also similar for the late-type subsample, but higher in the AGN for 75 per cent of the early-type subsample. We thus conclude that there is no signature of AGN quenching star formation in the body of the galaxy in our sample. We also find that 66 per cent of the AGN have higher ionized gas masses M than the controls – in the range 105–3 × 107 M⊙ – while 75 per cent of the AGN have higher ΣH+ within 0.2Re than the control galaxie

Precessing winds from the nucleus of the prototype Red Geyser?

Supermassive black holes (SMBHs) are present at the centre of most galaxies, with the related mass accretion processes giving origin to outflows in active galactic nuclei (AGNs). It has been presumed that only intense winds from luminous AGNs were able to suppress star formation until the discovery of a new class of galaxies with no recent star formation and with the nucleus in a quiescent state showing kpc scale outflows. We used SDSS MaNGA and Gemini Integral Field Spectroscopy of the prototype Red Geyser Akira and found that the orientation of the outflow changes by about 50° from its nucleus to kpc scales. A possible interpretation is that the outflow is produced by a precessing accretion disc due to a misalignment between the orientation of the disc and the spin of the SMBH. The precession of the central source is also supported by a similar change in the orientation of the ionization pattern. Although similar behaviour has commonly being reported for collimated relativistic jets, the precession of an AGN wide wind is reported here for the first time, implying on a larger work surface of the wind, which in turn increases the star formation suppression efficiency of the outflow

Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA : evidence of metal-poor accretion

We derive the metallicity (traced by the O/H abundance) of the narrow-line region (NLR) of 108 Seyfert galaxies as well as radial metallicity gradients along their galaxy discs and of these of a matched control sample of no active galaxies. In view of that, observational data from the SDSS-IV MaNGA survey and strong emission-line calibrations taken from the literature were considered. The metallicity obtained for the NLRs was compared to the value derived from the extrapolation of the radial oxygen abundance gradient, obtained from H II region estimates along the galaxy disc, to the central part of the host galaxies. We find that, for most of the objects (∼ 80 per cent), the NLR metallicity is lower than the extrapolated value, with the average difference ( D ) between these estimates ranging from 0.16 to 0.30 dex. We suggest that D is due to the accretion of metal-poor gas to the AGN that feeds the nuclear supermassive black hole (SMBH), which is drawn from a reservoir molecular and/or neutral hydrogen around the SMBH. Additionally, we look for correlations between D and the electron density (Ne), [O III]λ5007, and H α luminosities, extinction coefficient (AV) of the NLRs, as well as the stellar mass (M∗) of the host galaxies. Evidence of an inverse correlation between the D and the parameters Ne, M∗, and Av was found