11 research outputs found
Input Frequencies Optimization Based on Genetic Algorithm for Maximal Mutual Information
Among encountered problems in digital and analog communications, there is mismatch between canals and sources. As
regards theory of information, unfortunately, this mismatch found expression in information loss during transfer to
reception side. In order to settle the problem, the solution consists in adjustment of probability law at source so that we
maximize the mean mutual information. For a little number of symbols, either at emission or at reception, the work can
be done analytically with some difficulties. Unfortunately, the problem have tendency to become more and more difficult
and complicated as number of symbols increases. In this case and as alternative, we propose a non-traditional
optimization method, namely genetic algorithm, which will express, with regard to our problem, all its efficiency through
this paper with some conclusive applications
Cosmic ray oriented performance studies for the JEM-EUSO first level trigger
JEM-EUSO is a space mission designed to investigate Ultra-High Energy Cosmic Rays and Neutrinos (E > 5 ⋅ 1019 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
PRELIMINARY DESIGN AND SIMULATION OF SIPM DEVICE OPERATION FOR A POTENTIAL CUBESAT RADIATION DETECTOR
Ultrafiltration for the Removal of Cadmium in Waste Streams from Industrial Waste Incineration
International audienc
Influence of pressure on the gas/liquid interfacial area a and the coefficient kLa in a counter-current packed column
Validation of the gas-lift capillary bubble column as a simulation device for a reactor by the study of CO2 absorption in Na2CO3/NaHCO3 solutions
The effect of suspended matter concentration on the coagulation–flocculation and decantation process for low brackish water C (NaCl)
Modelling mass transfer during venting/soil vapour extraction: Non-aqueous phase liquid/gas mass transfer coefficient estimation
Meteor studies in the framework of the JEM-EUSO program
Abstract We summarize the state of the art of a program of {UV} observations from space of meteor phenomena, a secondary objective of the JEM-EUSO international collaboration. Our preliminary analysis indicates that JEM-EUSO, taking advantage of its large {FOV} and good sensitivity, should be able to detect meteors down to absolute magnitude close to 7. This means that JEM-EUSO should be able to record a statistically significant flux of meteors, including both sporadic ones, and events produced by different meteor streams. Being unaffected by adverse weather conditions, JEM-EUSO can also be a very important facility for the detection of bright meteors and fireballs, as these events can be detected even in conditions of very high sky background. In the case of bright events, moreover, exhibiting some persistence of the meteor train, preliminary simulations show that it should be possible to exploit the motion of the {ISS} itself and derive at least a rough 3D reconstruction of the meteor trajectory. Moreover, the observing strategy developed to detect meteors may also be applied to the detection of nuclearites, exotic particles whose existence has been suggested by some theoretical investigations. Nuclearites are expected to move at higher velocities than meteoroids, and to exhibit a wider range of possible trajectories, including particles moving upward after crossing the Earth. Some pilot studies, including the approved Mini-EUSO mission, a precursor of JEM-EUSO, are currently operational or in preparation. We are doing simulations to assess the performance of Mini-EUSO for meteor studies, while a few meteor events have been already detected using the ground-based facility EUSO-TA