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22 results on '"Moussi, Abderrahmane"'

11. Financial COVID-19 Crisis: an Empirical Study and Prediction of Some Stock Market Indices.

Author

Moussi, Abderrahmane and Ouazza, Ahmed

Subjects
*STOCK price indexes, *COVID-19 pandemic, *STOCK exchanges, *FINANCIAL crises, *RATE of return on stocks
Abstract

The main purpose of this paper is to highlight the direct linear relationship between the financial markets crash and the COVID-19 pandemic daily data. Moreover, we propose efficient modeling able to predict the values of some stock market indices without statistical learning. To achieve this goal, we first carry out a statistical study of the effects of COVID- 19 daily data on some European, American and Chinese stock indices during the period from December 31, 2019 until July 31, 2020 which will be divided into two phases. This study is accomplished particularly by evaluation of the correlations between these various stock market indices, between these indices and the pandemic daily data of the concerned countries as well as by the study of changes in stock market indices returns and daily volatility during the pandemic. We also establish linear regression models using stepwise method, then predictions successfully made. The obtained results by applications on real data show that the first period is marked by a linear causal relationship between the values of the studied stock indices, the Chinese COVID- 19 data and the values of CSI300 index. While in the second period, the evolution of the studied indices is characterized by a linear causal relationship with the American COVID-19 data and the NYSE index evolution. [ABSTRACT FROM AUTHOR]

Published
2021

20. Morphology and Electrical Properties of Copper Thin Films Electroplated on Ni/n+-Si(100) for Silicon Solar Contact

Author

Mebarki, Mourad, Moussi, Abderrahmane, Azizi, Amor, redha, Mohamed, and, Khelladi, and Mahiou, Linda

Abstract

Cu thin films were electrodeposited on Ni/n+-Si(100) substrate from sulfuric solution with fixed pH at room temperature. The effect of deposition time of Cu coatings was studied by using the chronoamperometry method (CA), the atomic force microscopy (AFM), X-ray diffraction (XRD) and four point probe to investigate surface topography , structure and electrical properties of Cu films. From electrochemical measurements, the Cu film thickness ranging from 63 nm to 8.9 um was calculated using Faraday's law. The AFM study showed a rugose surface of the Cu films and the variation of film morphology with deposition time were established. The XRD spectra revealed the formation of thin Cu films with a preferential orientation. Sheet resistance and resistivity showed strong dependence on the deposition time of Cu films. Cu films will be in the future metal contact for silicon solar cells.

Published
2016

22. Fish Consumption Impact on Coronary Heart Disease Mortality in Morocco: A Mathematical Model with Optimal Control.

Author

Lamlili, E. N. Mohamed, Boutayeb, Abdesslam, Derouich, Mohamed, Boutayeb, Wiam, and Moussi, Abderrahmane

Subjects
*FISH as food, *FOOD consumption, *CORONARY disease, *MATHEMATICAL models, *OPTIMAL control theory, *COOKING
Abstract

Extending the results of a previous paper on the relationship between fish consumption and coronary heart disease, an optimal control approach is proposed in the present paper. The Pontryagin's minimum principle is used to characterize the optimal control, to minimize the population of susceptible individuals and also to reduce the mortality rate of coronary heart disease. A numerical simulation is carried out to show the impact of the proposed optimal control. Indeed, the model shows that the prevalence and mortality of coronary heart disease can be significantly reduced in a period of 10 years. [ABSTRACT FROM AUTHOR]

Published
2016

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