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RISS 인기검색어
- 검색키워드
- 저자 : Salah Mahrous (검색결과 3 건)
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Poole -Frenkel conduction in polyvinyl chloride stabilized with dibutylin laurate-maleate
Salah Mahrous,T.A.Hanfy 한국물리학회 2004 Current Applied Physics Vol.4 No.5
Electric conduction in PVC-stabilized with dibutylin lauratemaleate has been investigated. In the low voltage region, theconduction was found to be due to thermally generated carriers. At higher voltages, the conduction mechanism was identied asPooleFrenkel type. The charge carriers injected on the polymer surface from the electrodes was found to disappear and become thesource of thermally stimulated discharge (TSD) current.
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Dielectric relaxation of chlorinated polyvinyl chloride (CPVC) stabilized with cyanoguanidine
Salah Mahrous,Taha A. Hanfy,Maged S. Sobhyv 한국물리학회 2007 Current Applied Physics Vol.7 No.6
Dielectric spectra of CPVC stabilized with cyanoguanidine were studied in the temperature range 300450 K and frequency range10 kHz to 1 MHz. In these conditions, only one clear dielectric relaxation band (a-type) associated with dipolar polarization wasobserved. Dielectric losses was found to directly proportional to the number of dipoles (N) which reects the orientational distributionof polymer chains in the amorphous region, at which dielectric losses concerned. Calculations of the dielectric modulusM0(T) at lowtemperature indicate that there is a role of the electrode polarization in the relaxation process. Dielectric loss data were used to calculatethe activation enthalpy by two dierent methods, the obtained value was. 450 kJ/mol.
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Swarm Satellite Observations of the 21 August 2017 Solar Eclipse
Hussien, Fayrouz,Ghamry, Essam,Fathy, Adel,Mahrous, Salah The Korean Space Science Society 2020 Journal of Astronomy and Space Sciences Vol.37 No.1
On 21 August 2017, during 16:49 UT and 20:02 UT period, a total solar eclipse started. The totality shadow occurred over the United States in time between ~17:15 UT and ~18:47 UT. When the solar radiation is blocked by the moon, observations of the ionospheric parameters will be important in the space weather community. Fortunately, during this eclipse, two Swarm satellites (A and C) flied at about 445 km through lunar penumbra at local noon of United States in the upper ionosphere. In this work, we investigate the effect of the solar eclipse on electron density, slant total electron content (STEC) and electron temperature using data from Swarm mission over United States. We use calibrated measurements of plasma density and electron temperature. Our results indicate that: (1) the electron density and STEC have a significant depletion associated with the eclipse; which could be due to dominance of dissociative recombination over photoionization caused by the reduction of ionizing extreme ultraviolet (EUV) radiation during the eclipse time (2) the electron temperature decreases, compared with a reference day, by up to ~150 K; which could be due to the decrease in photoelectron heating from reduced photoionization.
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