نتایج جستجو برای: particle board
تعداد نتایج: 230957 فیلتر نتایج به سال:
In this correspondence, the authors develop a novel method based on spherical radial cubature and Gauss–Laguerre quadrature rule for non-linear state estimation problems. The proposed filter, referred as cubature quadrature Kalman filter (CQKF) would be able to overcome inherent disadvantages associated with the earlier reported cubature Kalman filter (CKF). The theory and formulation of CQKF h...
Particle intensity, dose equivalent and absorbed dose have been measured on board the space shuttles during their visit to the International Space Station (ISS) on STS-108 and STS-112. The dose estimates are based on very accurate measurements of recoils produced in CR-39 by cosmic ray primary and secondary protons and heavier nuclei and by secondary neutrons. The corresponding LET spectra were...
We report a planned search technique for Gamma-Ray Bursts too weak to trigger the on-board threshold. The technique is to search residuals from a physically based background model used for analysis of point sources by the Earth occultation method. Searching residuals (as opposed to raw data) minimizes false triggers from occultation edges and many other effects which lead to a rapid variation i...
We study numerically and analytically the dynamics of charged particles on the Galton board, a regular lattice of disk scatters, in the presence of constant external force, magnetic field, and friction. It is shown that under certain conditions friction leads to the appearance of a strange chaotic attractor. In this regime the average velocity and direction of particle flow can be effectively a...
Based on a multiple hard scattering picture we derived simple relations between inclusive cross sections for large transverse momentum particle production in nucleus-nucleus, nucleon-nucleus and nucleonnucleon scatterings. The relations are compared with the recent data for 1~' production in aa collisions at high energy. Submitted to Physical Review D * Work supported in part by the Department ...
The Sileye detector can simultaneously measure particle energy losses from 2.5 Minimum Ionizing Particles (MIPs) to 2500 MIPs and determine the coordinates of passing particles with an accuracy of 1.8 mm. This instrument can be used for cosmic rays studies as well as for medical-biological and technological space researches. We will present the results obtained with the first prototype of the a...
The Altcriss project aims to perform a long term survey of the radiation environment on board the International Space Station. Measurements are being performed with active and passive devices in different locations and orientations of the Russian segment of the station. The goal is perform a detailed evaluation of the differences in particle fluence and nuclear composition due to different shie...
A new measurement of the cosmic-ray antiproton-to-proton flux ratio between 1 and 100 GeV is presented. The results were obtained with the PAMELA experiment, which was launched into low-Earth orbit on-board the Resurs-DK1 satellite on June 15th 2006. During 500 days of data collection a total of about 1000 antiprotons have been identified, including 100 above an energy of 20 GeV. The high-energ...
the aim of this study was to explore the minimum amount of urea formaldehyde (uf) resin content and optimum particleboard density while maintaining boards’ quality to reduce production costs. board density at three levels (520, 620 and 720 kg m-3) and resin content (6, 7 and 8%) were variable parameters. stepwise multivariate linear regression models were used to evaluate the influence of board...
این مقاله در پی پاسخ به این سؤال است که آیا زنان در هیئت مدیره منافع اقتصادی برای شرکت به ارمغان می‌آورند. به منظور روشن شدن این مسئله، این پژوهش به بررسی اثرات مستقیم و غیرمستقیم زنان در هیئت مدیره بر ارزش شرکت پرداخته است. با استفاده از یک مدل رگرسیونی چند متغیره اثر زنان در هیئت مدیره بر ارزش شرکت و عملکرد مالی شرکت برآورد شده است. شواهدی مستقیمی به دست نیامد که وجود یک نماینده زن در هیئت مد...
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