Effects of high voltage nanosecond pulsed plasma and micro DBD plasma on seed germination, growth development and physiological activities in spinach

2016 ◽  
Vol 605 ◽  
pp. 117-128 ◽  
Author(s):  
Sang-Hye Ji ◽  
Ki-Hong Choi ◽  
Anchalee Pengkit ◽  
Jun Sup Im ◽  
Ju Sung Kim ◽  
...  
Keyword(s):  
Seed Germination ◽  
High Voltage ◽  
Pulsed Plasma ◽  
Dbd Plasma ◽  
Growth Development

scholarly journals Nanostructured Titanium Film Deposited by Pulsed Plasma Magnetron Sputtering (Pdms) on a High Voltage Ceramic Insulator for Outdoor Use

2015 ◽  
Vol 18 (4) ◽  
pp. 853-859 ◽  
Author(s):  
Kleber Franke Portella ◽  
Priscilla Mengarda ◽  
Mariana d'Orey Gaivão Portella Bragança ◽  
Sebastião Ribeiro Júnior ◽  
Jose Sergio Santos de Melo ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
High Voltage ◽  
Pulsed Plasma ◽  
Titanium Film ◽  
Nanostructured Titanium ◽  
Ceramic Insulator

scholarly journals Investigation of the Effects of Plasma Discharges on Methane Decomposition for Combustion Enhancement of a Lean Flame

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1452 ◽  
Author(s):  
Maria Grazia De Giorgi ◽  
Antonio Ficarella ◽  
Donato Fontanarosa ◽  
Elisa Pescini ◽  
Antonio Suma
Keyword(s):  
High Voltage ◽  
Slight Modification ◽  
Flame Stabilization ◽  
Standoff Distance ◽  
Quartz Tube ◽  
Gas Temperature ◽  
Dbd Plasma ◽  
Peak Voltage ◽  
Burner Exit ◽  
The Impact

The present work focuses on the impact of dielectric barrier discharge (DBD) plasma actuators (PAs) on non-premixed lifted flame stabilization in a methane CH4-air Bunsen burner. Two coaxial DBD-PA configurations are considered. They are composed of a copper corona, installed on the outer surface of a quartz tube and powered with a high voltage sinusoidal signal, and a grounded needle installed along the burner axis. The two configurations differ in the standoff distance value, which indicates the positioning of the high frequency/high voltage (HV) electrode’s upper edge with respect to the needle tip. Experimental results highlight that flame reattachment is obtained at a lower dissipated power when using a negative standoff distance (i.e., placing the needle upstream with respect to the corona). At 11 kV peak-to-peak voltage and 20 kHz frequency, plasma actuation allowed for reattaching the flame with a very low dissipated power (of about 0.05 W). Numerical simulations of the electrostatic field confirmed that this negative standoff configuration has a beneficial effect on the momentum sources, which oppose the flow and show that the highest electric field extends into the inner quartz tube, as confirmed by experimental visualization close to the needle tip. The modeling predicted an increase in the gas temperature of about 21.8 °C and a slight modification of the fuel composition at the burner exit. This impacts the flame speed with a 10% increase close to the stoichiometric conditions with respect to the clean configuration.

On the boundary flow using pulsed nanosecond DBD plasma actuators

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840035
Author(s):  
Zi-Jie Zhao ◽  
Y. D. Cui ◽  
Jiun-Ming Li ◽  
Jian-Guo Zheng ◽  
B. C. Khoo
Keyword(s):  
Flat Plate ◽  
Stable State ◽  
Single Pulse ◽  
Plasma Actuator ◽  
Plasma Actuators ◽  
Pulsed Plasma ◽  
Dbd Plasma ◽  
Narrow Region ◽  
Layer Flow ◽  
Induced Velocity

Our previous studies in quiescent air environment [Z. J. Zhao et al., AIAA J. 53(5) (2015) 1336; J. G. Zheng et al., Phys. Fluids 26(3) (2014) 036102] reveal experimentally and numerically that the shock wave generated by the nanosecond pulsed plasma is fundamentally a microblast wave. The shock-induced burst perturbations (overpressure and induced velocity) are found to be restricted to a very narrow region (about 1 mm) behind the shock front and last only for a few microseconds. These results indicate that the pulsed nanosecond dielectric barrier discharge (DBD) plasma actuator has stronger local effects in time and spatial domain. In this paper, we further investigate the effects of pulsed plasma on the boundary layer flow over a flat plate. The present investigation reveals that the nanosecond pulsed plasma actuator generates intense perturbations and tends to promote the laminar boundary over a flat plate to turbulent flow. The heat effect after the pulsed plasma discharge was observed in the external flow, lasting a few milliseconds for a single pulse and reaching a quasi-stable state for multi-pulses.

scholarly journals Impacts of high temperature on embryonic growth and seed germination of dill (Anethum graveolens)

2021 ◽  
Author(s):  
Alexander F. Bukharov ◽  
Dmitry N. Baleev ◽  
Aleksey V. Soldatenko ◽  
Farhad B. Musaev ◽  
Parfait Kezimana ◽  
...  
Keyword(s):  
High Temperature ◽  
Seed Germination ◽  
Heat Exposure ◽  
Mother Plant ◽  
Anethum Graveolens ◽  
Short Term ◽  
Exogenous Factor ◽  
Seed Formation ◽  
Agricultural Plants ◽  
Growth Development

Temperature is the main exogenous factor that determines the growth, development and productivity of agricultural plants, including seed germination. In this work, we studied the thermosensitivity of heterogeneous dill seeds (Anethum graveolens). The study aimed to study the short-term (1-5 days) effect of high temperature (40°C) on the growth of the embryo and germination of dill seeds formed on different umbels of the mother plant. The growth of the embryo had a significant effect on seed germination (r = 0.976; P < 0.001). Seeds collected from primary umbels have a more developed embryo and can overcome the effects of thermal stress. We also found that the duration of heat exposure at 40°C, leading to a decrease in viability, can vary from 1-5 days for seeds from primary umbels, to 1-2 days for seeds from secondary umbels, which, in our opinion, is due to the heteromorphism. The influence of the place of seed formation on the mother plant and the high temperature during germination is critical for embryo growth and dill seeds’ germination.

scholarly journals Effect of constant high-voltage electric field on wheat seed germination

IOP SciNotes ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 024002
Author(s):  
S A Krivov ◽  
A V Lazukin ◽  
Y A Serdyukov ◽  
S V Gundareva ◽  
G A Romanov
Keyword(s):  
Seed Germination ◽  
Electric Field ◽  
High Voltage ◽  
Wheat Seed
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