Aiming at studying the influence of actuating frequency on plasma assisted detonation initiation by alternating current dielectric barrier discharge, a loosely coupled method is used to simulate the detonation initiat...Aiming at studying the influence of actuating frequency on plasma assisted detonation initiation by alternating current dielectric barrier discharge, a loosely coupled method is used to simulate the detonation initiation process of a hydrogenoxygen mixture in a detonation tube at different actuating frequencies. Both the discharge products and the detonation forming process which is assisted by the plasma are analyzed. It is found that the patterns of the temporal and spatial distributions of discharge products in one cycle are not changed by the actuating frequency. However, the concentration of every species decreases as the actuating frequency rises, and atom O is the most sensitive to this variation, which is related to the decrease of discharge power. With respect to the reaction flow of the detonation tube, the deflagration-todetonation transition（DDT） time and distance both increase as the actuating frequency rises, but the degree of effect on DDT development during flow field evolution is erratic. Generally, the actuating frequency affects none of the amplitude value of the pressure, temperature, species concentration of the flow field, and the combustion degree within the reaction zone.展开更多
Transcranial alternating current stimulation(tACS)is a noninvasive neuromodulation technique that regulates brain function by applying sinusoidal alternating currents of specific frequencies to targeted brain regions ...Transcranial alternating current stimulation(tACS)is a noninvasive neuromodulation technique that regulates brain function by applying sinusoidal alternating currents of specific frequencies to targeted brain regions through the scalp electrodes.[1]This guideline aims to evaluate and summarize the efficacy and safety of tACS in clinical applications.We conducted a structured literature search across major databases using the terms“tACS”or“transcranial alternating current stimulation”to identify all relevant literature up to June 2022.展开更多
基金Project supported by the Open Project of Science and Technology on Scramjet Laboratory,China(Grant No.CG-2014-05-118)the National Natural Science Foundation of China(Grant No.91441123)
文摘Aiming at studying the influence of actuating frequency on plasma assisted detonation initiation by alternating current dielectric barrier discharge, a loosely coupled method is used to simulate the detonation initiation process of a hydrogenoxygen mixture in a detonation tube at different actuating frequencies. Both the discharge products and the detonation forming process which is assisted by the plasma are analyzed. It is found that the patterns of the temporal and spatial distributions of discharge products in one cycle are not changed by the actuating frequency. However, the concentration of every species decreases as the actuating frequency rises, and atom O is the most sensitive to this variation, which is related to the decrease of discharge power. With respect to the reaction flow of the detonation tube, the deflagration-todetonation transition（DDT） time and distance both increase as the actuating frequency rises, but the degree of effect on DDT development during flow field evolution is erratic. Generally, the actuating frequency affects none of the amplitude value of the pressure, temperature, species concentration of the flow field, and the combustion degree within the reaction zone.
基金supported by grants from the National Key Research and Development Program of China(Nos.2021YFC2501400,2021YFC2501404).
文摘Transcranial alternating current stimulation(tACS)is a noninvasive neuromodulation technique that regulates brain function by applying sinusoidal alternating currents of specific frequencies to targeted brain regions through the scalp electrodes.[1]This guideline aims to evaluate and summarize the efficacy and safety of tACS in clinical applications.We conducted a structured literature search across major databases using the terms“tACS”or“transcranial alternating current stimulation”to identify all relevant literature up to June 2022.
