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Articles by M. Hedayati
Total Records ( 3 ) for M. Hedayati
  S. Sadeghi , M. Hedayati and S. Jamili
  Aim of this study was determination of sperms’ ATP content of golden grey mullet in different time, temperature and extenders. Caspian Sea Mugilidea is one of the most important fish of the sea fishery which nowadays is the predominant catches fish of the mentioned sea. The ATP content of mentioned fish sperm is an important index of fish fertility determination of the sample’s ATP concentration was done by ultra sensitive bioluminescence method. ATP content of sperms were determined at two different sampling temperature (10-12 and 18-20°C) and two different keeping temperature (4°C and room temperature) for 6 h and also ATP content assayed until 10 days storage in the three extender types (glycerol, 0.7 and 0.65% salt solution). Results of the present study showed that, ATP content of sperms, collected at 10-12°C was 74.04±7.22%, in comparison to 18-20°C. The ATP content of sperms during 6 h keeping at 4°C and room temperature were 90.26±0.91% and 17.17±1.49%, respectively. Determination of sperms’ ATP content after 5 days keeping in glycerol, 0.7 and 0.65% salt solution revealed that glycerol or 0.65% salt solution is better extender than 0.7% salt solution. But sperms which were kept in mentioned extenders for 10 days showed that glycerol was better than salt solutions based on sperm ATP content saving. Results revealed that, in order to save sperms’ ATP content of golden grey mullet, sampling at 18-20°C and keeping in glycerol as extender is recommended.
  M. Hedayati , N. Mariun , H. Hizam and S.M. Bashi
  Shunt FACTS devices are prevalent in industrial application of induction motors. These equipments are effective to compensate disturbances and increase motor speeding up. In this study an assessment study between two different shunt FACTS (SVC and STATCOM) installed on terminals of motor is done. A conventional PI controller is used to control the thyristor firing angle of SVC or phase angle of STATCOM. A pole placement method is applied to specify the perfect gain settings of the controllers. The results of simulations display that STATCOM has better response over SVC for improving dynamic behavior of induction motor under ideal supply conditions. Power quality problem that influence the dynamic behavior of induction motor, include non ideal conditions such as harmonics, interruptions, voltage unbalance and voltage sags. Whereas voltage sags is one of the main cause of disturbances in distribution systems, the performances of the induction motor under symmetrical and unsymmetrical voltage sags are investigated in this study. The results prove that STATCOM is more effectual than SVC for reduction of transients and refinement the voltage profile.
  F. Zarrineh , F. Salami , H.N. Bakht , M. Salavati and M. Hedayati
  To assess the change in plasma level of 22 and 20 kDa GH isoforms following acute aerobic exercise and chronic aerobic training, 30 male athletes in two pubertal and pre-pubertal groups were studied. Acute aerobic exercise consisted of 30 min running at 65% Vo2max on the treadmill. Plasma was sampled 30 min before and immediately after the aerobic exercise and assayed for total concentrations. These measurements were repeated at the end of six weeks of aerobic training (30 min running on the treadmill, three times weekly, at 70-80% Vo2max). In both groups, acute aerobic exercise was followed by increased 22 kDa and decreased 20 kDa concentration. These changes were larger in the pre-pubertal group. Chronic aerobic training was associated with decreased 22 kDa and increased 20 kDa response to acute aerobic exercise in both groups. There was no significant change in the rest levels of 22 and 20 kDa concentration in either groups following chronic aerobic training.
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