http://hdl.handle.net/123456789/2169 Search the Channel search http://repository.ksu.edu.sa/jspui/simple-search http://hdl.handle.net/123456789/5787 Title: Improving the lockhart and martinelli two-phase flow Correlation by SAS<br/><br/>Authors: Hemeida, Adel; Faisal Sumait, Faisal<br/><br/>Abstract: The correlation of Lockhart and Martinelli in its present form cannot be used to study a large set of data because it requires the use of charts and hence cannot be simulated numerically. A correlation between Lockhart and Martinelli parameters</>and X lor a two phase pressure drop in pipelines was developed using the Statistical Analysis System (SAS). This enabled the development of a computer program for the analysis of data using the Lockhart and Martinelli correlation. Fielddata from Saudi flowlines were then analysed using the program and the results show that the impoved Lockhart and Martinelli correlation predicts accurately the downstream pressure in flowlines with an average percent difference of 5.1 and standard deviation of 9.6%. http://hdl.handle.net/123456789/5710 Title: Automatic contingency analysis and passive Corrective control for Alleviating line overloads in a newly developing power system<br/><br/>Authors: EI-Razaz, Z.; Mazi, A.A.; Al-Marzooq, N.<br/><br/>Abstract: This paper implements a contingency selection algorithm to rank different contin-gencies. The algorithm uses the change in a performance index as a measure torank different single line outage contingencies. The shortcomings of the algorithmhave been highlighted. The main one is the masking phenomenon wherein acontingency which leaves a number of lines heavily loaded is ranked equally withone which produces single overload. It has been shown, that this masking can begreatly reduced by appropriate selection of the various parameters in the perform-ance index equation combined with experience of the system network configurationand operation. The overloads resulting from the high ranked contingencies havebeen alleviated by a passive corrective approach. This is based mainly uponcalculating a small percentage of the line distribution factors. A newly developingpower system of the central region of the Kingdom of Saudi Arabia has been usedto implement and demonstrate the effectiveness of both the ranking algorithm aswell as the passive corrective measure http://hdl.handle.net/123456789/5338 Title: Innovative scheme for evaluation of soil induced stresses using a customized two-point Gauss formula<br/><br/>Authors: Al-Shamrani, Mosleh A.<br/><br/>Abstract: This paper presents a systematic procedure in which the variation in induced stresses in soil layers is effectively dealt with using only two sublayers. A customized two-point Gauss quadrature formula was derived to evaluate induced stresses such that the weight factors for the derived formula were set equal to those of the two-point Gauss-Legendre formula. However, the base points were obtained by dividing the compressible layer into two sublayers whose thicknesses were determined such that their middle points are the base points for the derived formula. The thickness of the two sublayers was expressed in terms of a factor called the sublayering ratio. Expressions for this ratio were derived for different types of loads and loaded areas, and its values were presented in a series of normalized, non-dimensional charts. Numerical examples were included to illustrate the use of the developed charts for obtaining the value of the sublayering ratio, and the application of the derived formula in settlement computations.<br/><br/>Description: Civil Engineering Department, College of Engineering, King Saud University http://hdl.handle.net/123456789/4086 Title: Investigation of new nondegenerate dual-mode microstrip patch filter<br/><br/>Authors: Sheta, A.F.; Dib, N.; Mohra, A.<br/><br/>Abstract: A new nondegenerate dual-mode microstrip patch filter structure is introduced. Theproposed filter is based on a square microstrip patch with four slots etched in symmetrical form.Besides its simple structure, the filter has the advantages of small size and low loss. The full-waveIE3D package is used to analyse the proposed structure. Design curves that relate the moderesonance frequencies and fractional bandwidth against slot parameters are presented. A bandpassfilter is designed, analysed and tested at 2.15GHz. Experimental results show good agreement withtheoretical results.