Among his many scientific achievements, Dr Ayari recently set up a system, using an electronic telescope capable of detecting and observing the lunar crescent.

The invention, which will facilitate the observation of the lunar crescent in spite of adverse weather conditions, will save considerable time and efforts to determine the position of the lunar aster in setting up the beginning of religious holidays or events.

The Tunisian scientist, expressed his commitment to increase efforts in order to contribute to Tunisia 's aura abroad, as well as his willingness in giving conferences in Tunisian universities, so as to make to enable Tunisian students to benefit from his expertise.

The tank and 178 tons of readily accessible contaminated soil were excavated and properly disposed of early on, but other, harder-to-reach contaminated soils had to be left in place beneath and near building foundations, where essential underground utilities were located. Although Tetra Tech's engineering evaluation identified excavation as the preferred approach for remediating the remaining contamination, the cost of excavating the hard-to-reach soils was prohibitive, at over $1 million. After examining alternative remediation technologies, in-situ chemical oxidation (the application into the subsurface of highly reactive chemicals, which chemically oxidize and destroy contaminants on contact) was chosen as a more cost-effective means of site remediation. Most conventional in-situ chemical oxidation chemistries were ruled out, however, due to their corrosivity and tendency to generate intense heat and/or explosive pressures.

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