Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: charged particle

Sortuj według:

Ogranicz wyniki do:

Influence of space charged particles on satellite optical communication system

100%

Hou R. , Zhao S. , Xu J. , Wu J. , Li Y. , Zhan S. , Shi L. , Fang S.

2009

tom Vol. 39, nr 2

251-265

Although research of satellite optical communication system has been carried out for many years, there is scarce literature to comprehensively analyze the influence of space environment on satellite optical communication system. Different kinds of particles and fields exist in the space environment, including high energy charged particles, solar radiation, plasma environment, space fragment, etc. The Influence of space charged particles on satellite optical communication system was investigated in detail, which mainly related to single event upset (SEU), total dose effect and plasma environment. For SEU analysis the relation between single proton upset rate and satellite orbit was analyzed in detail. The reliability index of equipment based on SEU was proposed, the numerical calculation results have proved that the SEU effect was relatively less and corresponded to higher reliability of SRAM/MOS equipment under lower orbit altitude and inclination. For plasma environment analysis there is no obvious influence of plasma on laser signal transmission. But charging and discharging processes on satellite surface would lead to the malfunction of satellite communication system. The influence of charged particles and its related plasma on satellite optical communication system was investigated, which would be helpful for the design and the improvement of performance of satellite optical communication system.

Resonance acceleration of a charged particle in a laser beam and static magnetic field

75%

Dubik A. , Małachowski M. J.

Journal of Technical Physics

2009

tom Vol. 50, no 2

97-120

Conditions at which the charged particles can be accelerated to the significant energies under interaction with the laser or maser radiation and the static magnetic field have been studied. The studies have been performed on the basis of the derived by the author's analytical solutions. With the example of an electron, the trajectory, velocity and kinetic energy as a function of the acceleration time have been shown. We have defined the maximal static magnetic field which was found to be appropriate to achieve the resonance condition in the acceleration process. At certain values of the magnetic field, the projections of the 3-dimensional trajectory onto the plane perpendicular to the axis show quite regular curves in the shape of epicycloids or hypocycloids with convex and concave bows, respectively. In the resonance region, there appears an increase in effectiveness of the energy transfer from the electromagnetic field to the accelerated particle and it can be realized simply through a very small increase of magnetic induction. The significant gain of the energy by the accelerated electron occurs only in the case of inversely directed laser beam velocity and the static magnetic field. The maximal energy can be increased by rising the laser beam or the magnetic field intensities. The energy gained by an electron depends on the acceleration time and it increases until the maximum energy is reached. The distance the electron covers to gain the maximal energy, depends on the intensities of the laser beam and the static magnetic field, and on the acceleration time. The analysis of acceleration process in the maser beam shows many advantages arising from the longer wavelength radiation emitted. The essential advantage is connected with the reduction of the static axial magnetic field intensity.

Depozycja naelektryzowanych cząsteczek aerozolu w drogach oddechowych

63%

Grabarczyk Z. J.

tom R. 82, nr 12

72-75

W artykule przedstawiono aktualne poglądy na rolę ładunku elektrostatycznego cząsteczek fazy dyspersyjnej aerozolu w ich depozycji w drogach oddechowych człowieka i przedyskutowane niektóre inne, nie rozważane dotychczas efekty, mogące wspomagać depozycję cząsteczek naelektryzowanych dotychczas rozważane.

The paper presents the contemporary scientific view of the role of the electrostatic charge of the aerosol particles in their deposition in human air ways and some other effects which could significantly enhance the electrical effect but not considered as far as today.