Five new myxosporean species belonging to three different genera were described from the Nile tilapia Oreochromis niloticus in Bahr Shebin, Nile Tributary, Nile Delta, Egypt. These species are: Zschokkella nilei sp. n., Ortholinea africanus sp. n., Triangula egyptica sp. n., Myxobolus fomenai sp. n., and Myxobolus branchiophilus sp. n. Morphometry, light microscopy, and hand drawing of mature spores and plasmodia were presented for each species.

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With the rising population, environmental pollution, and social development, potable water is reducing and being contaminated day by day continually. Thus, several researchers have focused their studies on seas and oceans in order to get potable fresh water by desalination of their saltwater. Solar still of basin type is one of the available technologies to purify water because of free solar energy. The computational fluid dynamic CFD model of the solar still can significantly improve means for optimization of the solar still structure because it reduces the need for conducting large amount of experiments. Therefore, the main purpose of this study is presenting a multi-phase, three-dimensional CFD model, which predicts the performance of the solar still without using any experimental measurements, depending on the CFD solar radiation model. Simulated results are compared with experimental values of water and glass cover temperatures and yield of fresh water in climate conditions of Sheben El-Kom, Egypt (latitude 30.5° N and longitude 31.01° E). The simulation results were found to be in acceptable agreement with the experimental measured data. The results indicated that the daily simulated and experimental accumulated productivities of the single-slope solar still were found to be 1.982 and 1.785 L/m2 at a water depth of 2 cm. In addition, the simulated and experimental daily efficiency were around 16.79% and 15.5%, respectively, for the tested water depth.

The present work is concerned with a new steam cycle proposed as a modification to the normal regenerative steam cycle. A steam ejector and an extra feed water heater are incorporated into the latter cycle. The motive steam of the ejector is bled from the steam turbine. The ejector entrains a portion of the saturated steam exiting the turbine and entering the condenser. Both amounts of motive and entrained steam are raised in pressure and used as heating steam in the first feed water heater. The saturated water getting out of this feed water heater is further heated in the second feed water heater and the cycle is then completed. Thermodynamic analyses of the proposed cycle are developed and used for predicting the characteristic performance of the proposed cycle. The results of the current work show clearly that the thermal efficiency of the proposed cycle is always greater than that of the normal regenerative steam cycle.

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