Groundwater is the main water source in Jifarah plain, northwestern Libya, which suffers from a continuous decrease in the piezometric head. This is due to the difference between aquifer recharge and amount of water drawn each year to meet the increasing needs of the population supply, agricultural and industry activities. These were study the design of the model is very close to the natural hydrological conditions in the reservoir.

Conceptual and numerical models were implemented in a regional scale to show change in the natural situation after the over-pumping, which occurred in the last decades. Results of the conceptual model indicated that the highest groundwater levels and the value of discharge per unit width of aquifers. 

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In this paper SiC particle reinforce aluminum metal matrix composite welded using high power continuous laser. Microstructure of laser beam welded SiC/Al MMC is characterized as functions of laser processing parameters. Results show that sound weld with little pores can be produced by laser beam welding, while aluminum carbide is formed in the weld. The size and the volume fraction of aluminum carbide are proportional to the laser power density. direction of shielding gas flow has significant effect on weld quality and weld microstructure.

Precoded spatial multiplexing multiple-input multiple-output (MIMO) systems using limited feedback have been extensively studied to reduce the feedback information based on the notion of delay-free feedback channel. In order to reduce performance degradation of precoded spatial multiplexing MIMO systems due to delay in the feedback channel, in this paper, we take into account the time varying nature of the channel, and consider the feedback delay problem. We propose the use of a linear predictor at the receiver to provide the precoder at the transmitter with predicted channel state information, and hence, mitigate the effect of feedback delay. The predictor is implemented using Kalman filter. The performance of this method is evaluated using computer simulation, and the achieved results demonstrate improved bit error rate performance in frequency selective Rayleigh fading channels.