Informatics Publishing Limited

Sawadogo Moumouni ¹, Zougmore Francois ¹, Doumounia Ali ¹, Sanou Serge Roland ¹, Kebre B. Marcel ¹

Affiliations
1 Laboratoire de Materiaux et Environnement (LAME), UFR-SEA, Universite Ouaga 1 Pr Joseph Ki-Zerbo, Ouagadougou, BF

Abstract

This paper presents an optimization methodology for fixed service microwave link. To obtain high throughput on the microwave link, the possibility to use wideband channel and low modulation or the reverse are possible. We present a methodology to obtain high speed and best performance for microwave links based on modulation and frequency channel choice. In the first time we present a microwave design parameters, the performances of an Additive White Gaussian Noise channel (AWGN) and we propose a methodology for the ITU-RF adjacent channels arrangement optimization to obtain a high speed transmission with a best fade margin (99.9998% of annual availability) . In the second time, we present an experimental design using a microwave link design tool and measurements on physical link.

Keywords

Optimization, Frequency, Performance, Microwave, High Speed.

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Kohio Niessan ¹, Kagone Abdoul Karim ¹, Koalaga Zacharie ¹, Zougmore Francois ¹, Njomo Donatien ²

Affiliations
1 Universite de Ouagadougou, Burkina Faso, BF
2 Universite de Yaounde, CM

Abstract

In this paper we calculate the transport coefficients of plasmas formed by air and water vapor mixtures. The calculation, which assume local thermodynamic equilibrium (LTE) are performed in the temperature range from 500 to 12000 K. We use the Gibbs free energy minimization method to determine the equilibrium composition of the plasmas, which is necessary to calculate the transport coefficients. We use the Chapman-Enskog method to calculate the transport coefficients. The results are presented and discussed according to the rate of water vapor. The results of the total thermal conductivity and electrical conductivity show in particular that the increasing of the rate of water vapor in air can be interesting for power cut. This could be improve the performance of plasma during current breaking in air contaminate by the water vapor.

Keywords

Plasma, Equilibrium Composition, Transport Coefficients.

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Sanou Serge Roland ¹, Zougmore Francois ¹, Kebre Marcel ¹, Koalaga Zacharie ¹, Doumounia Ali ¹

Affiliations
1 Laboratoire de Materiaux et Environnement (LAME), UFR-SEA, Universite de Ouagadougou, Ouagadougou, BF

Abstract

This paper presents a comparison of the performances of coded OFDM (Orthogonal Frequency Division Multiplexing) for optical broadband transmission using Random Neural Network (RNN), a variant of RNN, Soft Decision Decoding (SDD) and LDPC channel decoding techniques. The performance evaluation is based firstly on the Error Vector Magnitude (EVM) to assess the effects of imperfections in the optical channel, and secondly on the estimated Bit Error Rate (BER) based on OSNR. The simulations are performed at a rate of 10Gb/s over 1000 km using VPI software co-simulation environment. The results show that the error correcting codes, particularly LDPC codes, are well suited and efficient for broadband.These codes provide satisfactory solutions for OFDM, reducing the effects of chromatic dispersion (CD), polarization mode dispersion (PMD), Intersymbol Interference(ISI) and non-linearities.

Keywords

OFDM, BER, EVM, Optical Fiber, Decoder, Neural Network, SDD, LDPC, Broadband.

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Kabore Karim ¹, Bambara Luc Telado ², Zongo Inoussa ³, Derra Moumouni ¹, Cisse Ousmane ¹, Zougmore Francois ¹, Darko Emmanuel ⁴

Affiliations
1 Department of Physics, University of Ouagadougou, BF
2 Nuclear Medicine Office, Yalgado Teaching Hospital, BF
3 National Center of Scientific Research and Technology, BF
4 Radiation Protection Institute, Ghana Atomic Energy Commission, GH

Abstract

Radionuclides transport in groundwater system is described using a numerical method in MatLab. The activity concentration and annual committed effective dose (ACED) to the public from consumption of the natural radionuclides ²³⁸U and ²³²Th were determined. The maximum activity concentrations were around 0.3 Bq/L, and 0.08 Bq/L for ²³⁸U and ²³²Th respectively. The activity concentration tends to be neglected at 1500 m for 238U and 1000 m for ²³²Th. from the discharged point. The corresponding annual committed effective dose estimated was 0.022 mSv/y. The results obtained for this study are far below the recommended levels of 10.0 Bq.L^-1 and 1.0 Bq.L^-1 for ²³⁸U and ²³²Th respectively for drinking water established by the WHO and 1 mSv per year dose limit recommended by the ICRP for public radiation exposure.

Keywords

Modelling, Groundwater, Activity Concentration, Committed Effective Dose, Uranium, Thorium.

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