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Výpočet proudové hustoty svazků nabitých částic
Oral, Martin
A method and a program for calculation of current density profiles was developed. It simulates the propagation of a charged-particle beam in an optical system. Since it requires data of positions of a high number (billions - 109) of particles on a given target, analytical expressions for paraxial position and aberrations are used for calculation, that are very fast to evaluate (millions of particles per second). Ray tracing is slow for this purpose (up to 100 particles per second). The accuracy of the analytical expressions is comparable with ray tracing in a certain space near the optical axis
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Optical fibers for chemical sensing
Matějec, Vlastimil ; Chomát, Miroslav ; Kašík, Ivan
The paper deals with performance of optical fibers for the development of chemical fibers. In its first part, there are physical basis shown are employed for the sensor design. Characteristics of particular types of fibers used in fiber-optic chemical sensors, namely polymer-clad silica /PCS/ fibers, sectorial fibers or fibers with special graded-index profiles are discussed in the next parts of the paper.
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Numerický 3D model kolize pevné částice s drsným dnem kanálu
Lukerchenko, Nikolay ; Chára, Zdeněk ; Vlasák, Pavel
The paper deals with 3D numerical model of the random process of rotating spherical particle-bed impact and rebound for saltation movement of a particle in channels with rough bed. The collision height and the contact point are defined as random variables of the collision process. The collision height depends on bed roughness. The contact point position depends on the irection of the particle velocity vector before the collision
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Nové výsledky v dozimetrii posádek letadel
Spurný, František
Important activities: The constitution of WG 21 of ISO TC/85 preparing a normative document on the dosimetry measurements onboard aircraft. The constitution of the Tasking group No. 50 of ICRU and ICRP with the goal to prepare a recommendation "Reference doses from cosmic radiation exposure of aircraft crews". The preparation of the fimal report on the EC Project DOSMAX. The preparation of EURADOS report for the committee on the article 31 of EURATOM. The acquisition new experimental data on aircraft crew exposure, partially in the frame of contract of author`s institute with Czech Airlines, a.s
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