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Your search keyword '"Almajid, Abdulhakim A."' showing total 205 results
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205 results on '"Almajid, Abdulhakim A."'

18. The Effect of Alloying, Processing and Heat Treatment on the Wear Resistance of Al-Cu-Mg-Ag Alloys.

Author

Abdelkawy, Abdallah, El-Danaf, E. A., and Almajid, Abdulhakim

Subjects
WEAR resistance, HEAT treatment, ALUMINUM alloys, ALLOYS, HOT rolling, SILVER alloys, MAGNESIUM alloys
Abstract

In this study, eight aluminum-based alloys with two levels of weight percentages of copper, magnesium, and silver were cast and hot rolled. The alloys were processed at two conditions; hot rolled solely or hot rolled and aged to peak condition (T6). Statistically designed experiments were carried out to investigate the wear resistance of the aluminum -based alloys. The study investigated the following process variables: the effect of the level of alloying, the processing condition, the level of applied load, and the test duration on the wear performance and weight loss as a response variable. Analysis of variance (ANOVA) was carried out to define the significant factors. The means effect and interactions plots were extracted, and the regression model was developed and experimentally validated. The weight percentages of Cu and Ag, applied load, and test duration were found to be significant. The wear resistance improved with increasing percentages of Cu, Mg and Ag and the peak aging. The regression model represented the experimental results properly. [ABSTRACT FROM AUTHOR]

Published
2023
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39. Experimental and numerical studies of dielectric properties of BaTi[O.sub.3]-platinum composites at microwave frequencies

Author

Kuga, Yasuo, Lee, Seung-Woo, Taya, Minoru, Almajid, Abdulhakim, Lee, Sangil, Li, Jing-Feng, and Watanabe, Ryuzo

Subjects
Dielectrics -- Research, Microwave devices -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The conductor loading method has been used for creating a lossy dielectric material with a desired loss tangent. This method may also be applicable for developing high dielectric constant materials. In this paper, we will present the experimental results of the dielectric properties of BaTi[O.sub.3] and BaTi[O.sub.3]-platinum (BaTi[O.sub.3]-Pt) composites. These composite materials were designed to increase the real part of the effective dielectric constant at high frequency. Three different platinum volume fractions were used, 3, 5 and 10%, to make BaTi[O.sub.3]-Pt composites, in addition to a pure BaTi[O.sub.3] material. To characterize the BaTi[O.sub.3]-Pt composites, microwave frequency measurements were conducted using the waveguide transmission technique. The experimental and numerical results verify that it is possible to increase the dielectric constant using the conductor loading method. Index Terms--Microwave dielectric properties, conductor loading, barium tetratitanate.

Published
2005

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