University of Bahrain

About: University of Bahrain is a education organization based out in Madīnat ‘Īsá, Bahrain. It is known for research contribution in the topics: Thin film & Doping. The organization has 1650 authors who have published 3405 publications receiving 48162 citations. The organization is also known as: Bahrain University & UoB.

Electrical and Optical Investigations on Tungsten-Incorporated CdO Thin Films

Abstract: Transparent conductive oxide tungsten-incorporated cadmium oxide (CdO) thin films were deposited on glass substrates by a vacuum evaporation technique. The structural, electrical, and optical properties have been investigated as functions of tungsten (W) doping content. The results show that W ions occupy structural interstitial positions in addition to accumulating on crystallite and grain boundaries. The bandgap of W-incorporated CdO films suffers narrowing that was studied within the framework of the available phenomenological models. The electrical study shows that W-incorporated CdO films are degenerate semiconductors. The lowest resistivity of 3.85 × 10−4 Ω cm was achieved, with carrier mobility of 39.2 cm2 V−1 s−1 and carrier concentration of 4.13 × 1020 cm−3, for W incorporation of 0.1%. The average transmission attained was ~80% in the near-infrared (NIR) spectral region, with the optical bandgap ranging from 1.77 eV to 2.0 eV.

CMOS analogue neurone circuit with programmable activation functions utilising MOS transistors with optimised process/device parameters

Abstract: In on-chip learning feedforward and feedback neural networks, different nonlinear activation functions are required. To date, these different functions are realised by physically changing the activation circuits. A novel CMOS analogue circuit suitable for modelling neurons with programmable activation functions is introduced. The proposed circuit is realised by optimising the second-order components of MOS transistors. Programmability of the activation function is achieved using an external controlling signal. Intensive simulations based on SPICE3 indicate that the proposed circuit can realise different activation functions including step, linear threshold, and sigmoid functions.

Field distribution and iron loss computation in reluctance augmented shaded-pole motors using finite element method

Abstract: A detailed field distribution in a reluctance augmented shaded-pole motor using the finite-element method is presented. No-load and loaded cases are considered separately. The effect of the shading coil on the spatial distribution of the air-gap flux density is examined, and it is found that the demagnetizing effect of the shading rings contributes to a more uniform distribution of the air-gap flux. Correct paths of various flux linkages and saturating regions are identified. The iron losses are computed using the flux density distribution obtained over the cross section of the machine. >