Subjects: Engineering and technical science >> Engineering Mechanics submitted time 2023-02-24
Abstract: The characteristics of whole waveforms of magnetizing inrush current and fault differential current were analyzed. By virtue of the similarity difference between the two currents and combining the superiorities of the Hausdorff distance algorithm, a novel criterion of the transformer differential protection based on the Hausdorff distance algorithm was proposed. The Hausdorff distance between the normalized differential current sequence and standard sinusoidal wave sequence was applied to distinguish between inrush current(including symmetrical inrush current) and fault differential current(including fault differential current superimposed with inrush current). The effectiveness, rapidity and anti-interference performance of the proposed criterion were validated with simulation tests.
Subjects: Chemistry >> Applied Chemistry submitted time 2020-03-05
Abstract: [Objective] Synthesis of potential neroprotective agent catalpol perpropionylated derivative (CP-6), and determination of the optimal microwav-assisted synthesis conditions. [Methods] CP-6 was synthesized by microwave-assisted synthesis (MCAS) using catalpol and propionyl anhydride as raw materials and pyridine as solvent and acid-binding agent. It was characterized by FT-IR, HRMS, NMR and assayed for neuroprotective activity by MTT method. [Results] When the molar ratio of propionic anhydride to catalpol is 18, the concentration of catalol in pyridine is 25 g/L, the reaction temperature of microwave reactor is 80 ℃, and the reaction time is 6 h, the yield of CP-6 can reach 98.51%. CP-6 has potential neroprotective activity."
Peer Review Status:Awaiting Review