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Bari (2000) proposed a method to determine the optimum slope angle and orientation of solar collectors for different periods of operation (1-365 days) at any position in the Malaysian territory. He mentioned that the optimum slope angle as well as the orientation can be found conveniently and accurately by this method. Later on he applied this method to calculate the optimum tilt angle over Thailand and Philippines. The present comments are focused on these statements and the novelty of this work. © 2016 Elsevier Ltd. All rights reserved. Source


Stanciu and Stanciu [1] mentioned that when using the Hottel and Woertz model for estimating the incident solar radiation, the daily optimum tilt angle Bopt,d for a flat plate collector could be computed as simplest as Bopt,d = L - δ function on the latitude, L, and solar declination, δ, with emphasizing that this equation is applicable all over the world from 0° latitude to 80° and the novelty of their work consists in finding this global optimum instead of "local" ones for which monthly adjustment is required. The present comments are focused on these statements and the novelty of this work. ©2015 Elsevier Ltd. All rights reserved. Source


Kharita M.H.,Syrian Atomic Energy Commission | Jabra R.,Higher Institute for Applied Science and Technology | Yousef S.,Syrian Atomic Energy Commission | Samaan T.,Syrian Atomic Energy Commission
Radiation Physics and Chemistry | Year: 2012

P 2O 5-PbO-BaO glass system has been investigated to see its potential use as radiation shielding material by studying the effect of the content of each of its composing oxides. The results show that this glass system is suitable as radiation shielding material and has some advantages comparing to the existing commonly used radiation protection glasses. © 2012 Elsevier Ltd. Source


Nader A.,Syrian Atomic Energy Commission | Kouba O.,Higher Institute for Applied Science and Technology
Measurement: Journal of the International Measurement Confederation | Year: 2010

The expression of the transverse resistance for an ohmic parallelepipedic layered conductor, measured with strip contacts, extended along its width, is a slowly convergent series. This series is reworked and transformed to the sum of an analytical part and an exponentially convergent series, which reduces considerably the number of terms needed for the numerical evaluation. In addition, an asymptotic formula is obtained, valid for Γ < 2, Γ is the effective anisotropy. This formula is used to determine the room temperature resistivity anisotropy of two small Γ layered superconductors, which are 2H-NbSe2 and 2H-TaSe2. © 2010 Elsevier Ltd. All rights reserved. Source


Kouba O.,Higher Institute for Applied Science and Technology | Nader A.,Syrian Atomic Energy Commission
Measurement: Journal of the International Measurement Confederation | Year: 2010

The geometric factor for the resistivity measurement of a thin disk, given in a previous work as a slowly converging series, is reworked and reduced to a simple form. On the other hand, the correction, when contacts are assumed of vanishing width, is also calculated analytically and discussed. It is found not to exceed 1.5% when λ, the ratio of distances between potential contacts and current contacts, is equal to 1. Our new expression is applied to determine the room temperature resistivity of two metallic thin disks. © 2010 Elsevier Ltd. All rights reserved. Source

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