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Polyethylene glycol (PEG) as a green solvent was employed to extract polysaccharide. The optimal conditions for PEG-based ultrasonic extraction of Dendrobium nobile Lindl. polysaccharide (JCP) were determined by response surface methodology. Under the optimal conditions: extraction temperature of 58.5°C; ultrasound power of 193W, and the concentration of polyethylene glycol-200 (PEG-200) solution...
To prevent flight crew from retracting or extending landing gear by mistake when aircraft is overspeed, set up a set of requirements according to relevant airworthiness regulations. Take some airplane as an example, the landing gear overspeed protection design could efficiently prevent flight crew from overspeed retracting or extending landing gear, though the safety requirement for the landing gear...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.