wastewater treatmentusing Reverse osmosis membranes

Poly(vinyl alcohol)(PVA)/cellulose acetate(CA) composite membranes were preparedfor metal ions removal from water. The top layer was modified by polyethylene glycol and glycerin,then irradiated with 32[J/cm2] photo dose to improve adequate selectivity for metal ions separation. The flux of water increased with increasingoperating pressure, and the maximum value of flux was 200[L/m2.h] at 4[bar] for the membrane(PVA68/PEG17/G15), but this membrane tear after applying pressure above 4[bar], while composite and CA membranes served for long time at pressures higher than (4[bar]). The rejection of ions decreased as the feed water pressure increased. The maximum percent retention of ions was found to be 97% for Pb+2, 96% for Cu+2, and 95% for Co+2at pressure of 2[bar] in composite membrane.

Studying of the possibilities of enhancing ship engine performance based on the dynamics of heat release in the cylinder via the analyzing of indicating pressure charts

Studies have proven that the indicatingpressure chart of marine engine cylinder can providemany information not only about pressure, but also about a large number of parameters that are useful in enhancing engine performance. Therefore, in this research paper, we attempt to study the indicators that complete the physical image of the work cycle. This attempt uses an elaborate and comprehensive mathematical model for obtaining and using these parameters in order to form a clear image of the work cycle based on the dynamics of heat release in the cylinder, for the purposes of enhancing performance and achieving a more efficient, more economical mechanical operation. As a result we will reach a number of conclusions and recommendations which,upon being approved and used, can help to achieve with great mathematical accuracy a more optimized characteristic of the work cycle.

Calculation of dose distributions produced by 6 MeV photon beam at variable depth in 3D Water Phantom using the MCNP4C2

To calculate the dose distributions of 6 MeV photon beam at variable depth in 3D water phantom the MCNP4C2 code was used, and the simulated dose profile was compared with that of the treatment planning computer system (TPS), and a good agreement was found between them. In conclusion, the MCNP4C2 code package presents a good tool adaptable to get dose distributions for the 6MeV photon beam and it can be considered as confirmed method for patient dose calculations.

Dosimetry calculations in brachy therapy treatment of cervix cancer using MCNP code

Using the Mont Carlo code (MCNP4C2), doses were calculated for organs of interest such as intestine, urinary bladder, rectum, vagina uterus, pancreas, spleen, liver, spinal cord and kidneys while patient was undergoing cervix brachytherapy by LDR instrument (Cs-137).

The influence of Radiostimulation on Morphological and Yield components of two different Durum wheat varieties

This experiment was conducted at the Faculty of Agriculture, Damascus University (2001 – 2002), to assess the effect of radiostimulation of seeds of two durum wheat varieties (Hourani and Cham 3) on some morphological traits and yield components, by using three doses of gamma rays (10, 15, and 20 GY). The study showed significant differences among radiation doses. The high doses (15, 20 GY) caused a significant deterioration in growth and development of plants, as well as yield components of the two varieties.