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RISS 인기검색어
- 검색키워드
- 저자 : Alonso Jr., G. (검색결과 4 건)
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EUSO-TA – First results from a ground-based EUSO telescope
Abdellaoui, G.,Abe, S.,Adams Jr., J.H.,Ahriche Jr., A.,Allard Jr., D.,Allen Jr., L.,Alonso Jr., G.,Anchordoqui Jr., L.,Anzalone Jr., A.,Arai Jr., Y.,Asano Jr., K.,Attallah Jr., R.,Attoui Jr., H.,Ave P Elsevier 2018 Astroparticle physics Vol.102 No.-
<P>EUSO-TA is a ground-based telescope, installed at the Telescope Array (TA) site in Black Rock Mesa, Utah, USA. This is the first detector to successfully use a Fresnel lens based optical system and multi-anode photomultipliers (64 channels per tube, 2304 channels encompassing a 10.6 degrees x 10.6 degrees field of view) for detection of Ultra High Energy Cosmic Rays (UHECR). The telescope is located in front of one of the fluorescence detectors of the TA experiment. Since its installation in 2013, the detector has observed several ultra-high energy cosmic ray events and, in addition, meteors. The limiting magnitude of 5.5 on summed frames (similar to 3 ms) has been established. Measurements of the UV night sky emission in different conditions and moon phases and positions have been completed. The performed observations serve as a proof of concept for the future application of this detector technology. (C) 2018 Elsevier B.V. All rights reserved.</P>
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Abdellaoui, G.,Abe, S.,Adams Jr., J.H.,Ahriche Jr., A.,Allard Jr., D.,Allen Jr., L.,Alonso Jr., G.,Anchordoqui Jr., L.,Anzalone Jr., A.,Arai Jr., Y.,Asano Jr., K.,Attallah Jr., R.,Attoui Jr., H.,Ave P North-Holland 2019 Astroparticle physics Vol.111 No.-
<P><B>Abstract</B></P> <P>The JEM-EUSO (Joint Experiment Missions for the Extreme Universe Space Observatory) program aims at developing Ultra-Violet (UV) fluorescence telescopes for efficient detections of Extensive Air Showers (EASs) induced by Ultra-High Energy Cosmic Rays (UHECRs) from satellite orbit. In order to demonstrate key technologies for JEM-EUSO, we constructed the EUSO-Balloon instrument that consists of a ∼1 m<SUP>2</SUP> refractive telescope with two Fresnel lenses and an array of multi-anode photo-multiplier tubes at the focus. Distinguishing it from the former balloon-borne experiments, EUSO-Balloon has the capabilities of single photon counting with a gate time of 2.3 µs and of imaging with a total of 2304 pixels. As a pathfinder mission, the instrument was launched for an 8 h stratospheric flight on a moonless night in August 2014 over Timmins, Canada. In this work, we analyze the count rates over ∼2.5 h intervals. The measurements are of diffuse light, e.g. of airglow emission, back-scattered from the Earth’s atmosphere as well as artificial light sources. Count rates from such diffuse light are a background for EAS detections in future missions and relevant factor for the analysis of EAS events. We also obtain the geographical distribution of the count rates over a ∼780 km<SUP>2</SUP> area along the balloon trajectory. In developed areas, light sources such as the airport, mines, and factories are clearly identified. This demonstrates the correct location of signals that will be required for the EAS analysis in future missions. Although a precise determination of count rates is relevant for the existing instruments, the absolute intensity of diffuse light is deduced for the limited conditions by assuming spectra models and considering simulations of the instrument response. Based on the study of diffuse light by EUSO-Balloon, we also discuss the implications for coming pathfinders and future space-based UHECR observation missions.</P>
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Cosmic ray oriented performance studies for the JEM-EUSO first level trigger
Abdellaoui, G.,Abe, S.,Acheli, A.,Adams Jr., J.H.,Ahmad Jr., S.,Ahriche Jr., A.,Albert Jr., J.-N.,Allard Jr., D.,Alonso Jr., G.,Anchordoqui Jr., L.,Andreev Jr., V.,Anzalone Jr., A.,Aouimeur Jr., W.,Ar Elsevier BV * North-Holland 2017 Nuclear Instruments & Methods in Physics Research. Vol. No.
<P><B>Abstract</B></P> <P>JEM-EUSO is a space mission designed to investigate Ultra-High Energy Cosmic Rays and Neutrinos ( E > 5 ⋅ 1 <SUP> 0 19 </SUP> eV ) from the International Space Station (ISS). Looking down from above its wide angle telescope is able to observe their air showers and collect such data from a very wide area. Highly specific trigger algorithms are needed to drastically reduce the data load in the presence of both atmospheric and human activity related background light, yet retain the rare cosmic ray events recorded in the telescope. We report the performance in offline testing of the first level trigger algorithm on data from JEM-EUSO prototypes and laboratory measurements observing different light sources: data taken during a high altitude balloon flight over Canada, laser pulses observed from the ground traversing the real atmosphere, and model landscapes reproducing realistic aspect ratios and light conditions as would be seen from the ISS itself. The first level trigger logic successfully kept the trigger rate within the permissible bounds when challenged with artificially produced as well as naturally encountered night sky background fluctuations and while retaining events with general air-shower characteristics.</P>
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WBC Analysis Through Image Processing
Christine D. Bandalan,Randy G. Alegre,Angelie C. Allego,Paolo Francisco E. Alonso,Daniel L. Balagosa,Rodrigo C. Talingting Jr 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This study aims to develop a simple, cost effective and efficient neutrophil, lymphocyte and monocyte counter using image processing techniques. To achieve this, a microscope, with a CCD camera mounted on it, is interfaced with the system. The camera provides the live feed from the microscope which is the source of still images that are subjected to the software for assessment. OpenCV library is used in the image processing techniques. The process has two main modules ? cell detection and cell matching. In cell detection, the region of interest (ROI) is extracted and undergoes image matching by means of histogram method. Matching module is subdivided into three ? neutrophil matching, lymphocyte matching and monocyte matching. The result of the matching process is the classification of the detected cell which can be neutrophil, lymphocyte, monocyte or unclassified. Additionally, the total number of neutrophils, lymphocytes and monocytes including unclassified cells found per image and on all images are given.
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