Results of research of pre-sowing disinfection of seeds in an electric field

2020 ◽  
pp. 178-186
Author(s):  
Y. V. Gerasymchuk ◽  
O. I. Adamenko ◽  
V. G. Sahnevych ◽  
O. M. Nychyporuk ◽  
Y. M. Berlinec ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Experiment ◽  
Corona Discharge ◽  
Electrostatic Field ◽  
Simultaneous Action ◽  
Small Scale ◽  
Soybean Seeds ◽  
Germination Energy ◽  
Maize Seeds ◽  
Model Sample

Annotation Purpose. Determine the effect of pre-sowing disinfection of seeds in an electric field on the indicators of sowing qualities and yielding properties. Methods. Analysis of the effect of the decontamination factors of the electric field on the pathogenic microflora of agricultural seeds and the creation of a model sample of electrotechnological means for its disinfection. Small-scale and laboratory experiments to determine the influence on the sowing qualities and yielding properties of seeds while simultaneously acting on the decontamination factors of an electric field. Results. Scheme of a model sample of an electrotechnological tool with simultaneous action on seeds of agricultural disinfectants of electrostatic field, corona discharge and ozone. Indicators of sowing qualities and yielding properties of “Terek” soybean seeds according to the results of small-field field experiment after pre-sowing decontamination in an electric field. Dependence of germination energy and laboratori likeness of wheat and maize seeds on the duration of simultaneous action of decontamination factors of electrostatic field, corona discharge and ozone. Conclusions. The simultaneous action of the decontamination factors of the electrostatic field, the corona discharge field and the ozone on soybean seeds improves its indicators of sowing qualities and yielding properties. In relation to control (seeds without disinfection in an electric field) the yield increase is 13.8–18.6%. The current tendency to reduce the duration of pest control is to increase the voltage of the electric field to 5.3 кV/сm. Disinfection of wheat and maize seeds in an electric field increases germination energy by 8–11% and laboratory germination by 5–9%. The highest value of germination energy was obtained with the duration of decontamination 30 min. Keywords: seeds, decontamination, electric field, simultaneous effect of decontamination factors, field experiment.

Transient Response of Electrostatic Field due to Collision ESD between Spherical Electrodes by using Bare-chip Optical Electric Field Sensor

2020 ◽  
Vol 140 (12) ◽  
pp. 599-600
Author(s):  
Kento Kato ◽  
Ken Kawamata ◽  
Shinobu Ishigami ◽  
Ryuji Osawa ◽  
Takeshi Ishida ◽  
...  
Keyword(s):  
Electric Field ◽  
Transient Response ◽  
Electrostatic Field ◽  
Electric Field Sensor ◽  
Field Sensor

scholarly journals MMS Multipoint electric field observations of small-scale magnetic holes

2016 ◽  
Vol 43 (12) ◽  
pp. 5953-5959 ◽  
Author(s):  
Katherine A. Goodrich ◽  
Robert E. Ergun ◽  
Frederick D. Wilder ◽  
James Burch ◽  
Roy Torbert ◽  
...  
Keyword(s):  
Electric Field ◽  
Small Scale ◽  
Field Observations

Effects of Space Charge on ESEM Gas Amplification

1997 ◽  
Vol 3 (S2) ◽  
pp. 609-610 ◽  
Author(s):  
B.L. Thiel ◽  
M.R. Hussein-Ismail ◽  
A.M. Donald
Keyword(s):  
Electric Field ◽  
Electrostatic Field ◽  
Secondary Electron ◽  
Sample Surface ◽  
Cascade Process ◽  
Secondary Electrons ◽  
Positive Ions ◽  
Space Charges ◽  
Cascade Amplification ◽  
Environmental Sem

We have performed a theoretical investigation of the effects of space charges in the Environmental SEM (ESEM). The ElectroScan ESEM uses an electrostatic field to cause gas cascade amplification of secondary electron signals. Previous theoretical descriptions of the gas cascade process in the ESEM have assumed that distortion of the electric field due to space charges can be neglected. This assumption has now been tested and shown to be valid.In the ElectroScan ESEM, a positively biased detector is located above the sample, creating an electric field on the order of 105 V/m between the detector and sample surface. Secondary electrons leaving the sample are cascaded though the gas, amplifying the signal and creating positive ions. Because the electrons move very quickly through the gas, they do not accumulate in the specimen-to-detector gap. However, the velocity of the positive ions is limited by diffusion.

Ground verification of in-orbit anomalies in the double probe electric field experiment on Freja

1996 ◽  
Vol 43 (6) ◽  
pp. 2767-2771 ◽  
Author(s):  
B. Johlander ◽  
R. Harboe-Sorensen ◽  
G. Olsson ◽  
L. Bylander
Keyword(s):  
Electric Field ◽  
Field Experiment ◽  
Double Probe

scholarly journals Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

2016 ◽  
Vol 4 ◽  
Author(s):  
Yingxia Wei ◽  
Yaoxiang Liu ◽  
Tie-Jun Wang ◽  
Na Chen ◽  
Jingjing Ju ◽  
...  
Keyword(s):  
Experimental Study ◽  
Femtosecond Laser ◽  
Electric Field ◽  
Corona Discharge ◽  
High Voltage ◽  
Fluorescence Spectra ◽  
Spectroscopic Analysis ◽  
Laser Pulses ◽  
Spectroscopic Measurement ◽  
High Electric Field

We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.

scholarly journals Charging of Piezoelectric Cellular Polypropylene Film by Means of a Series Dielectric Layer

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 333
Author(s):  
Pedro Llovera-Segovia ◽  
Gustavo Ortega-Braña ◽  
Vicente Fuster-Roig ◽  
Alfredo Quijano-López
Keyword(s):  
Electric Field ◽  
Corona Discharge ◽  
Dielectric Layer ◽  
Dielectric Breakdown ◽  
Piezoelectric Materials ◽  
High Resistivity ◽  
Internal Electric Field ◽  
Dielectric Polarization ◽  
Surface Flashover ◽  
In Series

Piezoelectric polymer cellular films have been developed and improved in the past decades. These piezoelectric materials are based on the polarization of the internal cells by means of induced discharges in the gas inside the cells. Internal discharges are driven by an external applied electric field. With this polarization method, cellular polypropylene (PP) polymers exhibit a high piezoelectric coefficient d33 and have been investigated because of their low dielectric polarization, high resistivity, and flexibility. Charging polymers foams is normally obtained by applying a corona discharge to the surface with a single tip electrode-plane arrangement or a triode electrode, which consists of a tip electrode-plane structure with a controlled potential intermediate mesh. Corona charging allows the surface potential of the sample to rise without breakdown or surface flashover. A charging method has been developed without corona discharge, and this has provided good results. In our work, a method has been developed to polarize polypropylene foams by applying an insulated high-voltage electrode on the surface of the sample. The dielectric layer in series with the sample allows for a high internal electric field to be reached in the sample but avoids dielectric breakdown of the sample. The distribution of the electric field between the sample and the dielectric barrier has been calculated. Experimental results with three different electrodes present good outcome in agreement with the calculations. High d33 constants of about 880 pC/N have been obtained. Mapping of the d33 constant on the surface has also been carried out showing good homogeneity on the area under the electrode.

scholarly journals Distribution frequency and incidence of seed-borne pathogens of some cereals and industrial crops in Serbia

2012 ◽  
Vol 27 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Jelena Levic ◽  
Slavica Stankоvic ◽  
Vesna Krnjaja ◽  
Aleksandra Bocarov-Stancic ◽  
Dragica Ivanovic
Keyword(s):  
Plant Species ◽  
Negative Correlation ◽  
Fusarium Species ◽  
Significant Negative Correlation ◽  
Soybean Seeds ◽  
Sunflower Seeds ◽  
Maize Seeds ◽  
Alternaria Species ◽  
Penicillium Spp ◽  
Distribution Frequency

A total of 41 species of fungi were isolated from seed samples of barley, maize, soybean, and sunflower collected at different locations in Serbia. The majority of detected species occurred on barley (35 of 41 species or 87.8%) comparing to soybean (17 of 41 species or 41.5%), sunflower (16 of 41 species or 39.0%) and maize (15 of 41 species or 36.9%). Species belonging to genera Alternaria, Chaetomium, Epicoccum, Fusarium, Penicillium and Rhizopus were present on seeds of all four plant species. Alternaria species were dominant on soybean, barley and sunflower seeds (85.7%, 84.7% and 76.9%). F. verticillioides and Penicillium spp. were mainly isolated from maize seeds (100 and 92.3% respectively), while other species were isolated up to 38.5% (Chaetomium spp. and Rhizopus spp.). F. graminearum, F. proliferatum, F. poae and F. sporotrichioides were the most common Fusarium species isolated from barley (51.1-93.3%), while on the soybean seeds F. oxysporum (71.4%), F. semitectum (57.1%) and F. sporotrichioides (57.1%) were prevalent. Frequency of Fusarium species on sunflower seeds varied from 7% (F. equiseti, F. graminearum, F. proliferatum and F. subglutinans) to 15.4% (F. verticillioides). Statistically significant negative correlation (r = -0.678

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