Title	Two Dimensional Natural Convection Heat Losses from Square Solar Cavity Receiver
Author	Hussain Saleem, Altaf H. Nizamani, Waseem Ahmed Bhutto, Abdul Majid Soomro, Muhammad Yousuf Soomro, Arrif Toufik
Citation	Vol. 19  No. 4  pp. 293-298
Keywords	Computational Fluid Dynamics Convective heat loss Nusselt number Solar cavity Solar concentrators

Title	Buck-Buck/Boost Converter with High Input Power Factor and Non-Floating Output Voltage
Author	Abdul Hakeem Memon, Noor Nabi Shaikh, Mahesh Kumar, Zubair Ahmed Memon
Citation	Vol. 19  No. 4  pp. 299-304
Keywords	Total harmonic distortion (THD), buck converter, buck/boost converter, power factor (PF)

Title	An Application of Principal Component Analysis for the Temporal Variations in Water Quality Data of Manora Channel: Karachi
Author	Sidrah Ghayas, Junaid Sagheer Siddiquie, Suboohi Safdar, Asif Mansoor
Citation	Vol. 19  No. 5  pp. 1-8
Keywords	Seasonal variations, pollutants, water quality, factor analysis, industrial effluents, chemical parameters, waste water.

Title	A General Structure for Improving the Lifetime and Stability Period of Wireless Sensor Networks
Author	Mohammad A. Abbadi, Mouhammd Al-Kasassbeh, Ameen Al Saudi
Citation	Vol. 19  No. 5  pp. 9-18
Keywords	M-GEAR, LEACH, wireless sensor networks (WSNs) and energy consumption.