scholarly journals Effect of High Voltage Electrical Pulses on the Oil Yield of Sunflower Meal

2020 ◽  
Vol 50 (1) ◽  
pp. 106-114
Author(s):  
Ivan Shorstkii
Keyword(s):  
High Voltage ◽  
Oil Quality ◽  
Sudden Change ◽  
Sunflower Meal ◽  
Prolonged Heating ◽  
Electric Pulses ◽  
Electrical Pulses ◽  
Voltage Pulses ◽  
Disintegration Index

Introduction. One of the most important tasks of the modern oil and cake industry is to develop advanced technologies that could increase the yield of high quality oil and related target components from oilseeds. Study objects and methods. The present research featured sunflower oilseeds. The main method of electrical treatment processing was high-voltage electrical pulses of microsecond duration: electric field strength = 13.3 kV/cm, frequency = 30 Hz. To assess the effects of electric pulses, we used disintegration index, i.e. a method of determining the number of destroyed cells according to the electrical conductivity of the material. To assess the effect of the treatment, the sunflower meal was pressed in a hydraulic press. The procedure was followed by extraction using hydrocarbon solvent. As an additional assessment, we analyzed the biomass impedance before and after treatment with high-voltage discharges with the determination of the disintegration index. To assess the quality of the resulting oil, we determined the acid and peroxide values. IR spectroscopy provided a more thorough assessment of the quality of the oil. Results and discussion. After the sunflower meal was treated with high-voltage pulses, the yield of pressed oil increased by 1.9%. The residual oil content in the meal fell down to 0.61% compared with 1.19% in the control samples. Oil quality indicators showed that treatment with high-voltage pulses did not significantly affect the acid value. The sudden change in the peroxide number was probably caused by the prolonged heating during the experiment. Conclusion. The obtained experimental data made it possible to forecast the prospects of using the high-voltage electric pulse for oilseed processing and assess the effectiveness of the technology together with its prospective industrial use. The alternative technology can replace the stage of crushing and pre-heating.

scholarly journals Effect of nanosecond electropulse effects on the properties of the alloy Cu-1.75% Cr

2019 ◽  
Vol 58 (5) ◽  
pp. 133-140
Author(s):  
Igor E. Ignatiev ◽  
◽  
Pavel V. Kotenkov ◽  
Elena V. Ignatieva ◽  
Eduard Yu. Goyda ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Electric Pulse ◽  
Melt Processing ◽  
Electric Pulses ◽  
Proposed Model ◽  
Significant Difference ◽  
Electrical Pulses ◽  
Mathematical Formulas ◽  
Cr System

The hardness, electrical resistance, deformation resistance of the Cu-1.75%Cr alloy obtained by irradiating its melt at a temperature of one thousand three hundred and fifty degrees Celsius by nanosecond unipolar electrical pulses of one thousand Hertz, a single signal duration of one nanosecond and ten kilowatts were experimentally determined. The dependences of the determined properties of the metal on the duration of the electric pulse irradiation are established. A comparison was made between irradiated and unirradiated, but obtained under the same thermal and temporal conditions, alloy samples. An improvement was observed in both mechanical (increase in hardness up to eight percent) and electrical (decrease in electrical resistance to fourteen and a half percent) characteristics due to electric pulse effect on the melt. It was found that the best time for electropulse treatment is from five to ten minutes. It is shown that the effect of irradiation of the Cu-1.75%Cr melt on the electrical resistance of the resulting alloy and its hardness differs from the results of irradiation of the Cu-1%Cr melt, but retains the same tendencies in changing properties. A significant difference was found in the hardness values of unirradiated samples of Cu-1.75%Cr and Cu-1%Cr alloys. A model of the connection of electrical resistance and hardness of Cu-Cr alloys with the redistribution of chromium in their volume is proposed. The results of melt processing by nanosecond unipolar electric pulses are presented in the form of microstructure snapshots, tables, and mathematical formulas. On the basis of the obtained results, it was concluded that the proposed model is useful for assessing the quality of Cu-Cr system alloys from the standpoint of increasing their hardness and decreasing electrical resistance, including after electropulse treatment of the corresponding melts.

An Analysis of On-Bord High-Voltage Converters of Single-Phase Alternating Current with Increased Miroelectric Power Factor

2020 ◽  
Vol 10 (10) ◽  
pp. 44-51
Author(s):  
Yury Yu. SKOROKHOD ◽  
◽  
Sehgey I. VOL’SKIY ◽  
Keyword(s):  
High Voltage ◽  
Single Phase ◽  
Input Current ◽  
Voltage Converter ◽  
Input Unit ◽  
Power Circuit ◽  
Electrical Systems ◽  
Static Converters ◽  
Technical Requirements

The power circuit arrangements of on-board high-voltage static converters fed from a 3000 V AC single-phase network that in the general case produce multi-channel AC and DC output voltages are considered. The basic technical requirements posed to such converters are formulated. The general structural diagram of high-voltage converters with improved electric power consumption quality is given. Possible power circuit arrangements for the high-voltage converter input unit based on single-phase input current correction devices are considered. A classification and criteria for comparative evaluation of the possible power circuit arrangements of these devices are proposed. The information presented in the article will be of interest for specialists engaged in designing on-board electrical systems involving high-voltage converters that must comply with strict requirements for the quality of consumed single-phase input current.

Effect of Storage Conditions on the Oil Quality of Chinese Tallow Tree Seeds

2008 ◽  
Author(s):  
Dorin Boldor ◽  
Beatrice Gabriela Terigar ◽  
Sundar Balasubramanian
Keyword(s):  
Oil Quality ◽  
Storage Conditions ◽  
Chinese Tallow Tree ◽  
Chinese Tallow ◽  
Tallow Tree ◽  
Tree Seeds

Irrigation effects on phenolic profile and extra virgin olive oil quality of ''Chemlali'' variety grown in South Tunisia

2021 ◽  
Vol 141 ◽  
pp. 322-329
Author(s):  
Jihed Faghim ◽  
Mbarka Ben Mohamed ◽  
Mohamed Bagues ◽  
Kamel Nagaz ◽  
Tebra Triki ◽  
...  
Keyword(s):  
Olive Oil ◽  
Oil Quality ◽  
Virgin Olive Oil ◽  
Extra Virgin Olive Oil ◽  
Phenolic Profile ◽  
Olive Oil Quality ◽  
Irrigation Effects ◽  
South Tunisia

Effect of the rise rate of nanosecond high-voltage pulses on the breakdown of air gaps

1999 ◽  
Vol 25 (9) ◽  
pp. 749-751 ◽  
Author(s):  
L. M. Vasilyak ◽  
S. P. Vetchinin ◽  
D. N. Polyakov
Keyword(s):  
High Voltage ◽  
Air Gaps ◽  
Rise Rate ◽  
Voltage Pulses
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