7 research outputs found
Experimental trial on surgical treatment for transverse fractures of the proximal phalanx: technique using intramedullary conical compression screw versus lateral compression plate
AbstractObjectiveTo compare the mechanical parameters between two methods for stabilization through compression: 1.5mm axial compression plate versus conical compression screw used as an intramedullary tutor.MethodsPolyurethane models (Sawbone®) that simulated transverse fractures of the proximal phalanx were used. The models were divided into three groups: lateral plate, conical screw and no implant.ResultsGreater force was needed to result in fatigue in the synthesis using an intramedullary plate. Thus, this model was proven to be mechanically superior to the model with the lateral plate.ConclusionStabilization using the Acutrak® screw for treating fractures in the model used in this trial presents mechanical results that are statistically significantly superior to those from the axial compression technique using the lateral plate (Aptus Hand®)
Ensaio experimental para tratamento cirúrgico das fraturas transversas da falange proximal - Técnica com parafuso intramedular cônico de compressão versus placa de compressão lateral
resumo Objetivo: Comparar os parâmetros mecânicos entre dois métodos de estabilização por com pressão: placa de compressão axial de 1,5 mm com o parafuso cônico de compressão usado como tutor intramedular. Métodos: Foram usados modelos de poliuretano (Sawbone(r)) que simulam a fratura da falange proximal transversa, divididos em três grupos (placa lateral, parafuso cônico, sem implante). Resultados: Há necessidade de uma maior força para resultar na fadiga da síntese com para fuso intramedular. Comprova-se, assim, a supremacia mecânica desse sobre o modelo com a placa lateral. Conclusão: A estabilização com o parafuso Acutrak(r), no tratamento das fraturas no modelo adotado neste ensaio, apresenta resultados mecânicos superiores e estatisticamente sig nificativos em comparacão com a técnica de compressão axial com o uso da placa lateral (Aptus Hand (r))
Ensaio experimental para tratamento cirúrgico das fraturas transversas da falange proximal – Técnica com parafuso intramedular cônico de compressão versus placa de compressão lateral
AugerPrime Surface Detector Electronics
International audienceOperating since 2004, the Pierre Auger Observatory has led to major advances in our understanding of the ultra-high-energy cosmic rays. The latest findings have revealed new insights that led to the upgrade of the Observatory, with the primary goal of obtaining information on the primary mass of the most energetic cosmic rays on a shower-by-shower basis. In the framework of the upgrade, called AugerPrime, the 1660 water-Cherenkov detectors of the surface array are equipped with plastic scintillators and radio antennas, allowing us to enhance the composition sensitivity. To accommodate new detectors and to increase experimental capabilities, the electronics is also upgraded. This includes better timing with up-to-date GPS receivers, higher sampling frequency, increased dynamic range, and more powerful local processing of the data. In this paper, the design characteristics of the new electronics and the enhanced dynamic range will be described. The manufacturing and test processes will be outlined and the test results will be discussed. The calibration of the SD detector and various performance parameters obtained from the analysis of the first commissioning data will also be presented
Constraints on metastable superheavy dark matter coupled to sterile neutrinos with the Pierre Auger Observatory
International audienceDark matter particles could be superheavy, provided their lifetime is much longer than the age of the universe. Using the sensitivity of the Pierre Auger Observatory to ultra-high energy neutrinos and photons, we constrain a specific extension of the Standard Model of particle physics that meets the lifetime requirement for a superheavy particle by coupling it to a sector of ultra-light sterile neutrinos. Our results show that, for a typical dark coupling constant of 0.1, the mixing angle between active and sterile neutrinos must satisfy, roughly, for a mass of the dark-matter particle between and GeV
The Pierre Auger Observatory Open Data
International audienceThe Pierre Auger Collaboration has embraced the concept of open access to their research data since its foundation, with the aim of giving access to the widest possible community. A gradual process of release began as early as 2007 when 1% of the cosmic-ray data was made public, along with 100% of the space-weather information. In February 2021, a portal was released containing 10% of cosmic-ray data collected from 2004 to 2018, during Phase I of the Observatory. The Portal included detailed documentation about the detection and reconstruction procedures, analysis codes that can be easily used and modified and, additionally, visualization tools. Since then the Portal has been updated and extended. In 2023, a catalog of the 100 highest-energy cosmic-ray events examined in depth has been included. A specific section dedicated to educational use has been developed with the expectation that these data will be explored by a wide and diverse community including professional and citizen-scientists, and used for educational and outreach initiatives. This paper describes the context, the spirit and the technical implementation of the release of data by the largest cosmic-ray detector ever built, and anticipates its future developments
The Pierre Auger Observatory Open Data
International audienceThe Pierre Auger Collaboration has embraced the concept of open access to their research data since its foundation, with the aim of giving access to the widest possible community. A gradual process of release began as early as 2007 when 1% of the cosmic-ray data was made public, along with 100% of the space-weather information. In February 2021, a portal was released containing 10% of cosmic-ray data collected from 2004 to 2018, during Phase I of the Observatory. The Portal included detailed documentation about the detection and reconstruction procedures, analysis codes that can be easily used and modified and, additionally, visualization tools. Since then the Portal has been updated and extended. In 2023, a catalog of the 100 highest-energy cosmic-ray events examined in depth has been included. A specific section dedicated to educational use has been developed with the expectation that these data will be explored by a wide and diverse community including professional and citizen-scientists, and used for educational and outreach initiatives. This paper describes the context, the spirit and the technical implementation of the release of data by the largest cosmic-ray detector ever built, and anticipates its future developments