Abstract: The quality and shelf life of foods of containing lipids (fats and oils) significantly reduces due to rancidity.Applications of natural antioxidants are one of the most effective manners to prevent the oxidation of oils and lipids. The antioxidant properties of juice extracted from barberry fruit (Berberris vulgaris.L) using maceration and SWE (10 bars and 120 - 180°C) methods were investigated and compared with conventional method. The amount of phenolic compound and reduction power of all samples were determined and the data were statistically analyzed using multifactor design. The results showed that the total amount of phenolic compound increased with increasing of pressure and temprature from 1861.9 to 2439.1 (mg Gallic acid /100gr Dry matter). The ability of reduction power of SWE obtained antioxidant extract compared with BHA (synthetic antioxidant) and ascorbic acid (natural antioxidant). There were significant differences among reduction power of extracts and there were remarkable difference with BHA and Ascorbic acid (P
Abstract: The output beam quality of multi transverse modes of
laser, are relatively poor. In order to obtain better beam quality, one
may use an aperture inside the laser resonator. In this case, various
transverse modes can be selected. We have selected various
transverse modes both by simulation and doing experiment. By
inserting a circular aperture inside the diode end-pumped Nd:YAG
pulsed laser resonator, we have obtained 00 TEM , 01 TEM
, 20 TEM and have studied which parameters, can change the mode
shape. Then, we have determined the beam quality factor of TEM00
gaussian mode.