ProGRES

ARTICLE

[Ceramic clay from Burkina Faso used in building construction]: Céramiques d'argile du Burkina Faso utilisées en construction immobilière

D. BATHIEBO

2 raw clays samples from Burkina Faso were analyzed in order to improve the ceramic process of roof tiles and small bricks manifacture. The major phases etected by X-ray diffraction in the 2 samples are kaolinite, illite, orthose and quartz. In addition, feeble quantities of albite and montmorillonite are also detected. The thermal behavior be(...)

Mots clés non renseignés

ARTICLE

Transformation grâce à un Filtrage Numérique des techniques "Ajout de Signal" en techniques "Tone Reservation" pour la Réduction du PAPR des Signaux OFDM

Désiré GUEL, Jacques PALICOT

L'OFDM (Orthogonal Frequency Division Multiplexing) souffre d'une grande variation d'amplitude caractérisée par un PAPR (Peak-to-Average Power Ratio) élevé. La "Réservation Tone" (TR) est une technique de réduction de PAPR qui utilise un ensemble de porteuses réservées pour transmettre le "signal de réduction du PAPR". Du f(...)

PAPR, Tone Reservation, Signaux OFDM

ARTICLE

In vitro Antibacterial Properties of Total Alkaloids Extract from Mitragyna Inermis (Willd.) O. Kuntze, a West African Traditional Medicinal Plant

Cheikna Zongo, Etienne-Francois O. Akomo, A. Savadogo, Louis Clement Obame, Jean Koudou and Alfred S. Traore

The antimicrobial activity of the total alkaloids from the leaves of Mitragyna inermis (Willd.) O. Kuntze (Rubiaceae) From Burkina Faso was evaluated using disc diffusion essay and broth microdilution assay. The extract was used against ten (10) reference bacterial strains and three (3) clinical isolates including Gram(+) and Gram(-) strains.(...)

Mots clés non renseignés

ARTICLE

Biodepollution of wastewater containing phenolic compounds from leather industry by plant peroxidases

Mamounata Diao • Naﬁsse´tou Oue´draogo • Lamine Baba-Moussa • Paul W. Savadogo • Amani G. N’Guessan • Imael H. N. Bassole´ • Mamoudou H. Dicko

This study deals with the use of peroxidases (POXs) from Allium sativum, Ipomoea batatas, Raphanus sativus and Sorghum bicolor to catalyze the degradation of free phenolic compounds as well as phenolic compounds contained in wastewater from leather industry. Secretory plant POXs were able to catalyze the oxidation of gallic acid, f(...)

Peroxidase Leather Wastewater Biodepollution Phenolic compound

ARTICLE

Analysis and comparison of clipping techniques for OFDM Peak-to-Average Power Ratio reduction

Guel Desire and Palicot Jacques

One of the main disadvantages of Orthogonal Frequency Division Multiplexing (OFDM) is its high Peak-to-Average Power Ratio (PAPR), which significantly reduces the efficiency of the High Power Amplifier (HPA). Due to the simplest way for PAPR reduction, clipping techniques are frequently used in practice for OFDM PAPR reduction. In this paper,(...)

Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), Clipping techniques

ARTICLE

Experimental characterization of gaseous species emitted by the fast pyrolysis of biomass and polyethylene

S. K. Ouiminga, T. Rogaume, M. Sougoti, J-M. Commandré, J. Koulidiati

This study aims to experimentally characterize the carbonaceous and nitrogenous species, from the flash pyrolysis of millet stalks and polyethylene plastic bags, using the device of the tubular kiln, coupled to two gas analyzers: Analyzer Fourier Transform Infrared (FTIR) and an analyzer Infrared Non-Dispersive (IRND). Gaseous products analyze(...)

Pyrolysis, Millet stalk, Polyethylene, Carbon

ARTICLE

La problématique diaspo à l’université de Ouagadougou ou les paradoxes de l’identité nationale burkinabè

Bouraiman ZONGO

A l’intérieur du champ de la migration, la problématique diaspo à l’Université de Ouagadougou est analysée comme une question identitaire dans un contexte social de rencontre et de diversité culturelle. L’objectif du texte est de mettre en évidence les difficultés que les étudiants burkinabè ont à surmonter les préjugés réciproques qui renforc(...)

Université de Ouagadougou, diaspo, diversité culturelle, conflits

ARTICLE

Sensitive and Selective Electrochemical Analysis of Methyl‐parathion (MPT) and 4‐Nitrophenol (PNP) by a New Type p‐NiTSPc/p‐PPD Coated Carbon Fiber Micro...

Issa Tapsoba, S. Bourhis, T. Feng, M. Pontié

A novel modified carbon fiber microelectrode (CFME) was obtained by combination of tetrasulfonated nickel phtalocyanine (p‐NiTSPc) electroformed film associated to para‐phenylenediamine (p‐PPD) electropolymerized outer‐coating. The modified CFMEs where denoted C/p‐NiTSPc and C/p‐NiTSPc/p‐PPD, respectively. These electrodes are dedicated to the(...)

Mots clés non renseignés

ARTICLE

OFDM PAPR Reduction Based on Nonlinear Functions without BER Degradation and Out-of-Band Emission

Guel Désire and Palicot Jacques

Peak-to-average power ratio (PAPR) reduction techniques based on nonlinear functions (clipping, companding techniques, etc) are the most straightforward PAPR reduction methods. These techniques reduce the PAPR at the cost of generating distortions. In this paper, we prove basing on Bussgang theorem that in context of PAPR reduction techniques(...)

Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), Nonlinear functions

ARTICLE

Medicinal plants used in traditional medicine in Centre East Region of Burkina Faso.

Ky K.J.M., Zerbo P., Gnoula C., Simporé J., Nikiéma J-B. et Millogo-Rasolodimby J.

Cette publication de 12 pages, 04 tableaux, 04 figures et 35 références, a porté sur l'inventaire et l'utilisation des plantes en médecine traditionnelle pour le traitement des maladies dans la Région du Centre-Est. La méthode était basée sur des enquêtes ethnobotaniques avec entretien semi-directif auprès de 50 personnes très expérimentées en(...)

Médecine traditionnelle, Indication thérapeutique, Plantes médicinales, Burkina Faso

ARTICLE

La coqueluche du nouveau-né en Afrique

K. NAGALO

Résumé La coqueluche est une maladie contagieuse due à Bordetella pertussis, qui peut être prévenue par la vaccination. Elle est grave chez les enfants de moins de 3 mois. Ceux-ci sont dans la plupart des cas contaminés par leurs parents alors qu'ils sont peu ou pas protégés contre la maladie. Les présentations atypiques sont fréquentes et la(...)

Mots clés non renseignés

ARTICLE

In Vitro Antiplasmodial and Antibacterial Activities of Canthium multiflorum Schum & Thonn (Rubiacea) Extracts

Akomo EF, Zongo C, Karou SD, Obame LC, Savadogo A, Atteke C, Traore AS

Because of the resistance of pathogens to actually available drugs, there is a continuous need for new agents to cure several diseases such as malaria and microbial infections. In the establishment of new drugs, plant are often a source of new leads, indeed aqueous, acetone and methanol extracts of Canthium multiflorum were tested for antiplas(...)

Mots clés non renseignés

ARTICLE

Clipping Formulated As an Adding Signal Technique for OFDM Peak Power Reduction

Guel Desire and Palicot Jacques

Due to the simplest way for PAPR reduction, clipping technique have been proposed and seem to be promising for use in commercial systems. In this paper, the conventional clipping technique is formulated as an adding signal technique for PAPR reduction. We show that, when clipping occurs very rarely, the adding signal for PAPR reduction commonl(...)

Peak to Average Power Ratio (PAPR), Nonlinear distortion, Wireless LAN