Application of the optimised next neighbour image cleaning method to the VERITAS array

Imaging atmospheric Cherenkov telescopes, such as the VERITAS array, are subject to the Night Sky Background (NSB) and electronic noise, which contribute to the total signal of pixels in the telescope camera. The contribution of noise photons in event images is reduced with the application of image cleaning methods. Conventionally, high thresholds must be employed to ensure the removal of pixels containing noise signal. On that account, low-energy gamma-ray showers might be suppressed during the cleaning. We present here the application of an optimised next neighbour image cleaning for the VERITAS array. With this technique, differential noise rates are estimated for each individual observation and thus changes in the NSB and afterpulsing are consistently being accounted for. We show that this method increases the overall rate of reconstructed gamma-rays, lowers the energy threshold of the array and allows the reconstruction of low energy (E > 70 GeV) source events which were suppressed by the conventional cleaning method.Comment: 9 pages, PoS, 38th International Cosmic Ray Conference (ICRC2023

A TERRITORIALIZAÇÃO DOS LOTEAMENTOS FECHADOS NO MUNICÍPIO DE VINHEDO/SP E SUAS IMPLICAÇÕES

Resumo: O presente artigo faz menção à atual dinâmica urbana do município de Vinhedo/SP, município este que outrora foi um grande produtor de uvas visando atender a demanda do mercado da capital paulista e hoje é uma cidade caracterizada pela presença marcante de loteamentos fechados em todo seu território. A segregação socioespacial e a atuação do capital imobiliário e suas transformações na população local serão os temas abordados.Palavras-chave: segregação socioespacial, desterritorialização, loteamentos fechados. 

A TERRITORIALIZAÇÃO DOS LOTEAMENTOS FECHADOS NO MUNICÍPIO DE VINHEDO/SP E SUAS IMPLICAÇÕES

Resumo: O presente artigo faz menção à atual dinâmica urbana do município de Vinhedo/SP, município este que outrora foi um grande produtor de uvas visando atender a demanda do mercado da capital paulista e hoje é uma cidade caracterizada pela presença marcante de loteamentos fechados em todo seu território. A segregação socioespacial e a atuação do capital imobiliário e suas transformações na população local serão os temas abordados.Palavras-chave: segregação socioespacial, desterritorialização, loteamentos fechados. 

Taxa de sudorese e condição hídrica em atletas de natação

A natação é uma modalidade esportiva na qual seus praticantes não dão a merecida importância ao consumo de líquidos, uma vez que o meio aquático confere uma falsa sensação de hidratação e a percepção de não transpirar. Portanto, o propósito deste estudo foi aferir a taxa de sudorese e observar a condição hídrica de atletas de natação, para que assim, uma reposição hídrica apropriada seja indicada afim de evitar a desidratação. Foram avaliados 9 atletas praticantes de natação (15,4 ± 1,72 anos), onde o peso inicial e final dos mesmos foi aferido para determinar a porcentagem de perda de peso (%pp) e a taxa de sudorese. Durante o treino consumiam água à vontade e ao término da sessão os mesmos eram orientados à urinar em um copo graduado e apresentar a amostra, e então tiras reagentes foram utilizadas para avaliar a densidade urinária. Os resultados mostraram uma %pp inferior à 1,5%, não caracterizando desidratação e tampouco queda do desempenho. A média da taxa de sudorese foi 8ml/min e todos obtiveram aumento da densidade urinária em 0,005, indicando sua concentração após o exercício. Alguns estudos que também visaram aferir a taxa de sudorese e a %pp durante a natação, bem como outros esportes, mostraram resultados semelhantes ao presente estudo. Conclui-se que dentre os avaliados não houve resultados significantes para se caracterizar um quadro de desidratação e que novos estudos devem ser realizados afim de investigar o papel dos eletrólitos e dos carboidratos na hidratação. ABSTRACTSwat rate and hydration status on swimmersThe swimming is a sport in which individuals who practice does not attach too much importance to liquid intake, since the aquatic environment provides a false sense of hydration and a perception that there is no sweating. Therefore, the purpose of this study was to measure the rate of sweating and observe the hydration status on swimmers, so that a properly amount of water be recommended, in order to avoid dehydration. Nine swimmers were evaluated, in which the initial and final weight were scaled to set their weight loss percentage afterwards and sweat rate. During the training time was allowed to consume water ad libitum and at the end of the session they were instructed to urinate into a measuring cup and bring the sample, then, reactant strips were used to measure the urine's specific gravity. The results demonstrated weight loss percentage lower than 1,5%, which does not describe a dehydration process, neither a performance decrease. The sweat rate’s average was 8ml/min and an increase of urine's specific gravity at 0,005, signaling their concentration post workout. Some papers that aimed to measure the rate of sweating and weight loss percentage during the exercise reported similar results. It concludes that among the evaluated, there were no significant results for characterizing a dehydration process and further studies are suggested in order to explore the role of electrolytes and carbohydrates on hydration

O USO DE DROGAS LÍCITAS E ILÍCITAS NA GRAVIDEZ: CAUSAS E CONSEQUÊNCIAS

Objectives: This study aimed to identify and describe the prevalence of legal and illegal drug use in pregnant women and relate this use to the most frequent causes reported in medical records and the consequences for the mother, as well as for the fetuses. Methods: This is a retrospective study based on the analysis of 50 medical records of pregnant or postpartum women who have been or are chemically dependent, attended at Mãe Mogiana, a program run by the city of Mogi das Cruzes that connects doctors and specialists with pregnant and postpartum women, from 2010 to 2020. For the study, 50 medical records of pregnant women aged between 18 and 30 years, with a history of legal and illegal drug use were analyzed. Results: The results showed that the participants, most of them have elementary and high school education, are women with different professions, but most work in an outsourced company and live in a stable relationship. The use of cigarettes and alcohol was identified as the most used drugs. Conclusion: It can be concluded that the drugs legally sold in Brazil are the most used among pregnant women, because they are more accessible.Objetivos: El presente estudio tuvo como objetivo identificar y describir la prevalencia del uso de drogas lícitas e ilícitas en mujeres embarazadas y relacionar este uso con las causas más frecuentes reportadas en los registros médicos y las consecuencias para la madre, como los fetos. Método: Se trata de un estudio retrospectivo basado en el análisis de 50 registros médicos de mujeres embarazadas o posparto, que han sido o son químicamente dependientes, atendidos en Mãe Mogiana, un programa de la prefectura de Mogi das Cruzes que conecta médicos y especialistas con mujeres embarazadas y puérperas, en el período de 2010 a 2020.Para el estudio, se analizaron 50 registros médicos de mujeres embarazadas entre 18 y 30 años, con antecedentes de consumo de drogas legales e ilícitas. Resultados: Los resultados mostraron que las participantes, en su mayoría de educación primaria y secundaria, son mujeres con diferentes profesiones, pero la mayoría trabajan en una empresa de terceros y viven en una unión estable. El consumo de cigarrillos y alcohol se identificó como las drogas más utilizadas. Conclusión: Se puede concluir que los medicamentos vendidos legalmente en Brasil son los de mayor uso entre las mujeres embarazadas, porque son más accesibles.Objetivos: O presente estudo teve por objetivo identificar e descrever a prevalência do uso de drogas lícitas e ilícitas em gestantes e relacionar este uso as causas mais frequentes relatadas nos prontuários médicos e as consequências para a mãe, tal como, para os fetos. Método: Trata-se de um estudo retrospectivo baseado na análise de 50 prontuários de mulheres gestantes ou puérperas, que tenham sido ou são dependentes químicas, atendidas na Mãe Mogiana, programa da prefeitura de Mogi das Cruzes que conecta médicos e especialistas com gestantes e puérperas, no período de 2010 a 2020.Para o estudo, foram analisados 50 prontuários de gestantes entre 18 a 30 anos, com histórico de uso de drogas lícitas e ilícitas. Resultados: Os resultados demonstraram que as participantes, em sua maioria tem ensino fundamental e médio, são mulheres com diferentes profissões, mas a maioria trabalha em empresa terceirizada e vivem em união estável. Identificou-se o uso do cigarro e do álcool como as drogas mais utilizadas. Conclusão: Pode-se concluir que as drogas vendidas legalmente no Brasil são as de maior uso entre as gestantes, pelo fato de serem mais acessíveis

Multiwavelength Observations of the Blazar PKS 0735+178 in Spatial and Temporal Coincidence with an Astrophysical Neutrino Candidate IceCube-211208A

We report on multiwavelength target-of-opportunity observations of the blazar PKS 0735+178, located 2.°2 away from the best-fit position of the IceCube neutrino event IceCube-211208A detected on 2021 December 8. The source was in a high-flux state in the optical, ultraviolet, X-ray, and GeV γ-ray bands around the time of the neutrino event, exhibiting daily variability in the soft X-ray flux. The X-ray data from Swift-XRT and NuSTAR characterize the transition between the low-energy and high-energy components of the broadband spectral energy distribution (SED), and the γ-ray data from Fermi-LAT, VERITAS, and H.E.S.S. require a spectral cutoff near 100 GeV. Both the X-ray and γ-ray measurements provide strong constraints on the leptonic and hadronic models. We analytically explore a synchrotron self-Compton model, an external Compton model, and a lepto-hadronic model. Models that are entirely based on internal photon fields face serious difficulties in matching the observed SED. The existence of an external photon field in the source would instead explain the observed γ-ray spectral cutoff in both the leptonic and lepto-hadronic models and allow a proton jet power that marginally agrees with the Eddington limit in the lepto-hadronic model. We show a numerical lepto-hadronic model with external target photons that reproduces the observed SED and is reasonably consistent with the neutrino event despite requiring a high jet power

Search for Ultraheavy Dark Matter from Observations of Dwarf Spheroidal Galaxies with VERITAS

Dark matter is a key piece of the current cosmological scenario, with weakly interacting massive particles (WIMPs) a leading dark matter candidate. WIMPs have not been detected in their conventional parameter space (100 GeV $\lesssim M_{\chi} \lesssim$ 100 TeV), a mass range accessible with current Imaging Atmospheric Cherenkov Telescopes. As ultraheavy dark matter (UHDM; $M_{\chi} \gtrsim$ 100 TeV) has been suggested as an under-explored alternative to the WIMP paradigm, we search for an indirect dark matter annihilation signal in a higher mass range (up to 30 PeV) with the VERITAS gamma-ray observatory. With 216 hours of observations of four dwarf spheroidal galaxies, we perform an unbinned likelihood analysis. We find no evidence of a $\gamma$-ray signal from UHDM annihilation above the background fluctuation for any individual dwarf galaxy nor for a joint-fit analysis, and consequently constrain the velocity-weighted annihilation cross section of UHDM for dark matter particle masses between 1 TeV and 30 PeV. We additionally set constraints on the allowed radius of a composite UHDM particle.Comment: 10 pages, 7 figure

VERITAS and Fermi-LAT constraints on the Gamma-ray Emission from Superluminous Supernovae SN2015bn and SN2017egm

Superluminous supernovae (SLSNe) are a rare class of stellar explosions with luminosities ~10-100 times greater than ordinary core-collapse supernovae. One popular model to explain the enhanced optical output of hydrogen-poor (Type I) SLSNe invokes energy injection from a rapidly spinning magnetar. A prediction in this case is that high-energy gamma rays, generated in the wind nebula of the magnetar, could escape through the expanding supernova ejecta at late times (months or more after optical peak). This paper presents a search for gamma-ray emission in the broad energy band from 100 MeV to 30 TeV from two Type I SLSNe, SN2015bn, and SN2017egm, using observations from Fermi-LAT and VERITAS. Although no gamma-ray emission was detected from either source, the derived upper limits approach the putative magnetar's spin-down luminosity. Prospects are explored for detecting very-high-energy (VHE; 100 GeV - 100 TeV) emission from SLSNe-I with existing and planned facilities such as VERITAS and CTA.Comment: 20 pages, 7 figures, 2 table