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Plasmonic nanostructures of SnO2:Sb thin film under gamma radiation response

Maged A. F., Amin M., Osman H., Nada L. A. M.

Materials Science Poland

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2020

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Vol. 38, No. 1

62--72

EN

This paper is a part of a natural dye solar cell project. Conductive transparent oxide (CTO) films have been deposited onto preheated glass substrates using a spray pyrolysis technique. The optical, electrical, structural properties as well as thermal annealing and gamma radiation response were studied. The average optical energy gap of doped films for direct allowed and direct forbidden transitions were found to be 3.92 and 3.68 eV, respectively. The plasmon frequency and plasmon energy after doping were found to be 3.48 x 1014 s-1 and 0.23 eV. The negative absorbance of the doped film was observed in UV-Vis range after applying both thermal annealing and ϒ-dose irradiation with 22 kGy. The negative refractive index of the doped film in UV range (220 – 300 nm) is promising for optical applications. The electron mobility μe reached a maximum of 27.4 cm2·V-1·s-1for Sb concentration of 10 %. The corresponding resistivity ρ and sheet resistance Rs reached their minimum values of 1.1 x 10-3 Ω·cm and 35 Ω·sq-1, respectively. The dopant concentration has been increased from 4.13 x 1019 to 2.1 x 1020cm-3. The doped film was found to exhibit three diffraction peaks associated with (2 2 2), (2 0 0), and (2 1 1) reflection planes, of which the peak of (2 2 2) of Sb2O3 and the peak of (2 0 0) were very close.

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M-estimation of the mixed-type generalized linear model

Dong Y., Song L., Wang M., Amin M.

Probability and Mathematical Statistics

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2018

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Vol. 38, Fasc. 1

209--223

EN

To investigate the features of the individual from the mixed-type model, a novel model, named the mixed-type generalized linear model, is proposed firstly in this work, which is verified to be realistic and useful. We consider the robustness of M-estimation to estimate the unknown parameters of the mixed-type generalized linear model. By applying the law of large numbers and the central limit theorem, the consistency and asymptotic normality of the M-estimation for the mixed-type generalized linear model are proved with regularity assumptions. At last, in order to evaluate the finite sample performance of the estimator for the new model, several applied instances are presented, which show the good performance of the estimator.

3

Remarks on the relationship between Cooperating Distributed grammar systems and Lindenmayer systems

Amin M.

Fundamenta Informaticae

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1998

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Vol. 36, nr 2,3

103-107

EN

In [2] it is shown that the family of languages generated by cooperating distributed (CD) grammar systems with context-free components in the derivation modes =k,>.k, for k>2, and the family of EOL languages are incomparable. Because one of the languages used in the proof of the incomparability does not work, we fill here the gap, using another language. We also give an effective procedure for constructing an ETOL system form a given context-free cooperating/distributed (CD) grammar system working in the maximum mode of cooperation.