May 2008

Annual effective dose and concentration levels of heavy metals in different types of tea in Egypt

Six marked brands of black tea (S1, S2, S4, S5, S6, and S7) and one type of green tea (S3) which commonly consumed in Egypt, were collected from local markets. The total alpha and beta gross activities in different tea samples were measured. The annual effective dose (mSv/y) for both total alpha and beta gross activities (Bq/2 gm) related to different types of tea drink corresponding to each radionuclide was...

Author(s): Y. F. Lasheen, N. S. Awwad, A. El-khalafawy and A. A. Abdel-Rassoul

May 2008

Removal OF EMG and ECG artifacts from EEG based on real time recurrent learning algorithm

EEG (Electroencephalograph) recording from the scalp has biological artifacts and external artifacts.  Biological artifacts, which are generated, can be EMG (Electromyograph) signal, EOG  (Electrooculograph) signal or ECG (Electrocardiograph) signal. These artifacts appear as noise in the  recorded EEG signal individually or in a combined manner. Usually physicians are misled by...

Author(s): H. N. Suresh and C. Puttamadappa

May 2008

Estimation of solar radiation at Uturu, Nigeria

The estimation of the solar radiation at Uturu latitude 05.33oN and 06.03oN was carried out in this work. The temperature data were obtained from 5th – 31st October, 2007) using the maximum and minimum thermometer placed in the Stevenson screen at 1.5 m The Hargreaves equation was used to estimate the solar radiation at Uturu. The mean global solar radiation obtained for the period is...

Author(s): I. U. Chiemeka

May 2008

Phase and conductivity dynamics of strontium hexaferrite nanocrystals in a hydrogen gas flow

The phase and conductivity dynamics of strontium hexaferrite nanocrystals were isothermally studied at different temperatures during a constant flow of hydrogen gas at normal atmospheric pressure. The nanocrystals were prepared by self-flash combustion of acetate precursors. While the formed phase was characterized using XRD, TEM, and optical microscopy after hydrogen exposure, the electrical conductivity was in-situ...

Author(s): A. A. Fargali, M. K. Zayed, M. H. Khedr and A. F. Moustafa

May 2008

Inhibiting effect of cetyl pyridinium chloride (CPC) on the corrosion of mild steel in acidic medium

The inhibiting effect of Cetyl Pyridinium Chloride (CPC) on mild steel in 1M Hydrochloric acid has been studied by using three techniques namely: weight loss, electrochemical polarization and metallurgical research microscopic techniques.  Results obtained reveal that CPC is good inhibitor and shows very good corrosion inhibition efficiency (IE). The IE was found to vary with concentration of inhibitor and...

Author(s): Atul Kumar