2,514 research outputs found

    iindex : plataforma ‘omni-channel’ para o Comércio a Retalho

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    Atualmente, devido à massificação dos acessos à internet em todo o mundo, o uso de dispositivos móveis e a consequente facilidade de acesso à informação, os consumidores estão mais informados e exigentes do que nunca. Para acompanhar as tendências dos consumidores, retalhistas tem vindo a modernizar os seus canais de venda recorrendo a novas tecnologias que permitam, não só aumentar as vendas, mas também satisfazer as expectativas dos seus clientes e proporcionar-lhes uma melhor experiência de compra. No que diz respeito a retalhistas que tenham loja física, esta tarefa torna-se mais difícil de realizar. Para colmatar estas dificuldades, as empresas começam a recorrer ao conceito designado como Internet das Coisas para interligar os canais digitais com a loja física. A Internet da Coisas (IoT) representa uma rede de equipamentos e/ou dispositivos eletrónicos com conectividade que permitem recolher e enviar informação. O uso deste tipo de equipamento, juntamente com o já presente dispositivo móvel dos consumidores, permite aos retalhistas interligar a sua loja física aos canais digitais existentes e, desta forma, enriquecer a experiência de compra dos seus clientes. Com o surgimento deste tipo de dispositivos, e as suas múltiplas aplicabilidades, começou a haver necessidade de ferramentas que permitissem integrar estes equipamentos com outros canais digitais. Assim, o objetivo deste projeto consiste no desenvolvimento de uma plataforma que permite a empresas de comércio a retalho integrar nas suas lojas o conceito IoT, interligar os diferentes canais digitas e, desta forma, oferecer aos seus clientes uma verdadeira experiencia de compra inovadora e transversal entre todos os canais de venda existentes

    RESPOSTAS CARDIOVASCULARES AGUDAS APÓS UMA, DUAS E TRÊS SÉRIES EM EXERCÍCIO RESISTIDO

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    O objetivo do presente estudo foi comparar a frequência cardíaca (FC), a pressão arterial (PA) e o duplo produto (DP) após uma, duas e três séries de um exercício do treinamento resistido e, ainda, estimar o número de séries necessárias para se atingir o DPrisco. Treze indivíduos fisicamente ativos (25 ± 3 anos; 80,2 ± 12,9 kg; 177,0 ± 6,0 cm), experientes em treinamento resistido, realizaram 3 séries de 10 repetições com 75% de 1RM no leg press 45º. O intervalo entre as séries foi de 1 minuto. As medidas de FC e PA foram aferidas antes do exercício e ao final de cada série. A pressão arterial sistólica (PAS), a FC e o DP apresentaram valores mais elevados que os observados no repouso, bem como, diferenças significativas interséries. A pressão arterial diastólica (PAD) não se alterou ao longo das séries do exercício. A FC mostrou um maior aumento percentual (96, 109 e 115% a cada série, respectivamente) comparado a PAS (32, 39 e 43% a cada série, respectivamente). Como o DP combina as respostas da FC e PAS, ficaram evidentes maiores aumentos percentuais (158, 190 e 210% a cada série, respectivamente). O DP de repouso foi de 7886 mmHg.bpm, logo para atingir o DPrisco seriam necessárias 7 séries para que fosse ultrapassado (31543 mmHg.bpm)

    Measurement of the cosmic ray spectrum above 4×10184{\times}10^{18} eV using inclined events detected with the Pierre Auger Observatory

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    A measurement of the cosmic-ray spectrum for energies exceeding 4×10184{\times}10^{18} eV is presented, which is based on the analysis of showers with zenith angles greater than 6060^{\circ} detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above 5.3×10185.3{\times}10^{18} eV, the "ankle", the flux can be described by a power law EγE^{-\gamma} with index γ=2.70±0.02(stat)±0.1(sys)\gamma=2.70 \pm 0.02 \,\text{(stat)} \pm 0.1\,\text{(sys)} followed by a smooth suppression region. For the energy (EsE_\text{s}) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find Es=(5.12±0.25(stat)1.2+1.0(sys))×1019E_\text{s}=(5.12\pm0.25\,\text{(stat)}^{+1.0}_{-1.2}\,\text{(sys)}){\times}10^{19} eV.Comment: Replaced with published version. Added journal reference and DO

    Energy Estimation of Cosmic Rays with the Engineering Radio Array of the Pierre Auger Observatory

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    The Auger Engineering Radio Array (AERA) is part of the Pierre Auger Observatory and is used to detect the radio emission of cosmic-ray air showers. These observations are compared to the data of the surface detector stations of the Observatory, which provide well-calibrated information on the cosmic-ray energies and arrival directions. The response of the radio stations in the 30 to 80 MHz regime has been thoroughly calibrated to enable the reconstruction of the incoming electric field. For the latter, the energy deposit per area is determined from the radio pulses at each observer position and is interpolated using a two-dimensional function that takes into account signal asymmetries due to interference between the geomagnetic and charge-excess emission components. The spatial integral over the signal distribution gives a direct measurement of the energy transferred from the primary cosmic ray into radio emission in the AERA frequency range. We measure 15.8 MeV of radiation energy for a 1 EeV air shower arriving perpendicularly to the geomagnetic field. This radiation energy -- corrected for geometrical effects -- is used as a cosmic-ray energy estimator. Performing an absolute energy calibration against the surface-detector information, we observe that this radio-energy estimator scales quadratically with the cosmic-ray energy as expected for coherent emission. We find an energy resolution of the radio reconstruction of 22% for the data set and 17% for a high-quality subset containing only events with at least five radio stations with signal.Comment: Replaced with published version. Added journal reference and DO

    Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy

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    We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cosmic-ray energy. A comparison with predictions from state-of-the-art first-principle calculations shows agreement with our measurement. The radiation energy provides direct access to the calorimetric energy in the electromagnetic cascade of extensive air showers. Comparison with our result thus allows the direct calibration of any cosmic-ray radio detector against the well-established energy scale of the Pierre Auger Observatory.Comment: Replaced with published version. Added journal reference and DOI. Supplemental material in the ancillary file

    SELNET clinical practice guidelines for bone sarcoma

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    Bone sarcoma are infrequent diseases, representing < 0.2% of all adult neoplasms. A multidisciplinary management within reference centers for sarcoma, with discussion of the diagnostic and therapeutic strategies within an expert multidisciplinary tumour board, is essential for these patients, given its heterogeneity and low frequency. This approach leads to an improvement in patient's outcome, as demonstrated in several studies. The Sarcoma European Latin-American Network (SELNET), aims to improve clinical outcome in sarcoma care, with a special focus in Latin-American countries. These Clinical Practice Guidelines (CPG) have been developed and agreed by a multidisciplinary expert group (including medical and radiation oncologist, surgical oncologist, orthopaedic surgeons, radiologist, pathologist, molecular biologist and representatives of patients advocacy groups) of the SELNET consortium, and are conceived to provide the standard approach to diagnosis, treatment and follow-up of bone sarcoma patients in the Latin-American context

    Is it really advantageous to operate proximal femoral fractures within 48 h from diagnosis? – A multicentric retrospective study exploiting COVID pandemic-related delays in time to surgery

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    Objectives: Hip fractures in the elderly are common injuries that need timely surgical management. Since the beginning of the pandemic, patients with a proximal femoral fracture (PFF) experienced a delay in time to surgery. The primary aim of this study was to evaluate a possible variation in mortality in patients with PFF when comparing COVID-19 negative versus positive. Methods: This is a multicentric and retrospective study including 3232 patients with PFF who underwent surgical management. The variables taken into account were age, gender, the time elapsed between arrival at the emergency room and intervention, pre-operative American Society of Anesthesiology score, pre-operative cardiovascular and respiratory disease, and 10-day/1-month/6-month mortality. For 2020, we had an additional column, “COVID-19 swab positivity.” Results: COVID-19 infection represents an independent mortality risk factor in patients with PFFs. Despite the delay in time-to-surgery occurring in 2020, no statistically significant variation in terms of mortality was detected. Within our sample, a statistically significant difference was not detected in terms of mortality at 6 months, in patients operated within and beyond 48 h, as well as no difference between those operated within or after 12/24/72 h. The mortality rate among subjects with PFF who tested positive for COVID-19 was statistically significantly higher than in patients with PFF who tested. COVID-19 positivity resulted in an independent factor for mortality after PFF. Conclusion: Despite the most recent literature recommending operating PFF patients as soon as possible, no significant difference in mortality was found among patients operated before or after 48 h from diagnosis

    Expedição ao Sítio Histórico e Patrimônio Cultural Kalunga: um Relato de Experiência

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    The Kalunga Historical and Cultural Heritage Site (SHPCK) is located in the northeast of Goiás and is considered one of the best-preserved areas of native Cerrado in all of Brazil. This is due to local geographic characteristics and mainly to the sustainable character of agricultural production by the traditional peoples who inhabit the region. In addition to having a vast preserved territory, the Kalungas have unique traditional knowledge about local plants. Due to biodiversity, they have access to herbal plants that can be used in human and animal food. However, the number of species of toxic plants may also considered high. With this report we aim to describe the unique experience that was the Expedition to the Kalunga Historical and Cultural Site and Heritage, as well as to emphasize the importance of the toxic plants of the Cerrado and the appreciation of traditional knowledge.A Comunidade Quilombola Kalunga fixou-se no Sítio Patrimônio Histórico e Cultural Kalunga (SHPCK), localizado no nordeste do estado de Goiás, e é considerada uma das áreas mais bem preservadas de Cerrado nativo em todo o Brasil. Isso se deve à dificuldade de acesso, às características geográficas locais e também ao caráter sustentável da produção agropecuária do povo quilombola que habita a região. Além de possuírem vasto território preservado, os Kalungas detêm conhecimento tradicional singular sobre as plantas locais e, graças à biodiversidade do Cerrado, eles têm acesso a plantas fitoterápicas e que podem ser utilizadas na alimentação humana e animal. No entanto, o número de espécies de plantas tóxicas também pode ser considerado elevado. Com este relato, objetivamos descrever a experiência única que foi a Expedição ao Sítio e Patrimônio Histórico e Cultural Kalunga, assim como ressaltar a importância das plantas tóxicas do Cerrado e da valorização do conhecimento tradicional.A Comunidade Quilombola Kalunga fixou-se no Sítio Patrimônio Histórico e Cultural Kalunga (SHPCK), localizado no nordeste do estado de Goiás, e é considerada uma das áreas mais bem preservadas de Cerrado nativo em todo o Brasil. Isso se deve à dificuldade de acesso, às características geográficas locais e também ao caráter sustentável da produção agropecuária do povo quilombola que habita a região. Além de possuírem vasto território preservado, os Kalungas detêm conhecimento tradicional singular sobre as plantas locais e, graças à biodiversidade do Cerrado, eles têm acesso a plantas fitoterápicas e que podem ser utilizadas na alimentação humana e animal. No entanto, o número de espécies de plantas tóxicas também pode ser considerado elevado. Com este relato, objetivamos descrever a experiência única que foi a Expedição ao Sítio e Patrimônio Histórico e Cultural Kalunga, assim como ressaltar a importância das plantas tóxicas do Cerrado e da valorização do conhecimento tradicional
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