scholarly journals Influence of ultrasonic treatment on the change of monocrystalline silicon defective region

2021 ◽  
Vol 2086 (1) ◽  
pp. 012035
Author(s):  
A A Solovyev ◽  
V V Rybin ◽  
A V Kulagin
Keyword(s):  
Experimental Study ◽  
Ultrasonic Treatment ◽  
Monocrystalline Silicon ◽  
Surface Strength ◽  
Ultrasonic Action ◽  
Defective Region ◽  
Processing Modes

Abstract The article presents the results of an experimental study of ultrasonic action on monocrystalline silicon samples. The influence of the processing modes on the surface strength of the material under study was found.

INFLUENCE OF INTENSITY OF ULTRASONIC ACTION ON DEGREE OF PURIFICATION OF HALITE WASTE FROM CALCIUM SULPHATE IMPURITY

2018 ◽  
Vol 61 (12) ◽  
pp. 122-128
Author(s):  
Olga E. Nisina ◽  
Sergey V. Lanovetskiy ◽  
Oleg K. Kosvintsev
Keyword(s):  
Sodium Chloride ◽  
Ultrasonic Treatment ◽  
Calcium Sulfate ◽  
Calcium Sulphate ◽  
Raw Material ◽  
Technical Solution ◽  
Optimal Regime ◽  
Minimum Concentration ◽  
Ultrasonic Action ◽  
Residual Content

When enriching potassium-magnesium ores, millions of tons of solid halite waste are formed, occupying vast areas and posing a danger to the environment. The main useful component of both these wastes is sodium chloride, which serves as a raw material in many chemical industries. The most common processing lines are the production of technical sodium chloride and technical sodium chloride solution. These products are intermediate and can be used in further chemical processes. Obtaining these products of the required quality is hindered by the presence of impurities, such as CaSO4, MgCl2, insoluble residues. The most undesirable impurity is calcium sulphate, the concentration of which can reach 3%. According to the literature sources, the optimal intensity of ultrasonic treatment of the water-dispersed medium was determined. The results of analyzes of phase and granulometric composition of solid halite waste (quarry salt and halite dump) are presented. The character of distribution of calcium sulfate impurity in crystals of halite waste is revealed. The article examines the results of the study of the influence of the intensity of ultrasonic treatment on the residual content of calcium sulphate in halite waste. Based on the results of the studies, the duration and intensity of the ultrasonic effect were established, at which the minimum concentration of calcium sulfate in the resulting halite raw material is reached. The obtained results allowed to establish the optimal regime of the process of cleaning the halite raw materials (intensity of ultrasonic action, processing time), which allow to significantly reduce the content of calcium sulphate during the mechanical cleaning stage and confirmed the potential possibility of using the obtained results for improving the technology of sodium chloride technical solution production, solid halite waste produced by potassium chloride "Uralkali".

Development of Wear-Resistant Materials Based on Polytetrafluoroethylene and Carbon Fibers of UVIS-AK-P Brand

2019 ◽  
Vol 945 ◽  
pp. 327-332 ◽  
Author(s):  
M.A. Markova ◽  
P.N. Petrova
Keyword(s):  
Carbon Fibers ◽  
Polymer Matrix ◽  
Tribological Properties ◽  
Ultrasonic Treatment ◽  
Energy Deposition ◽  
Planetary Mill ◽  
Mechanochemical Processing ◽  
Ultrasonic Action ◽  
Mechanical And Tribological Properties ◽  
Tribotechnical Properties

The present paper considers the influence of various technological approaches, based on the application of joint mechanochemical processing of composite components and ultrasonic action, on the performance of composites based on PTFE and discrete carbon fibers of UVIS-AK-P brand. It is established that the use of a certain method of energy deposition on the composite components for the complex enhancement of physical-mechanical and tribological properties depends on the concentration of carbon fibers (CF) in polymer matrix. As a result of the joint mechanoactivation treatment of the components in the planetary mill for 2 minutes, an improvement in physical-mechanical and tribotechnical properties of PTFE with CF concentration of 5 wt.% is observed. An improvement at concentration of 3 wt.% of CF is detected during ultrasonic treatment of PCM components.

scholarly journals Ultrasound-assisted dewatering of crude oil from Kumkol oilfield

2021 ◽  
pp. 4-10
Author(s):  
Zhanna Nadirova ◽  
Oleksandr Ivakhnenko ◽  
Manap Zhantasov ◽  
Gulmira Bimbetova ◽  
Kazim Nadirov
Keyword(s):  
Crude Oil ◽  
Water Content ◽  
Ultrasonic Treatment ◽  
Initial Water Content ◽  
Residual Water ◽  
Acoustic Intensity ◽  
Initial Water ◽  
Ultrasonic Action ◽  
Ultrasound Assisted ◽  
Oil Emulsions

Reducing the water content of crude oil is a necessary step in preparing oil for transportation and processing. This task is complicated by the presence of stable water-in-oil emulsions. The most widely used approach to oil demulsification is exploring chemical demulsifiers. However, the high cost and impossibility of regenerating the latter require the search for new ways to destroy water-oil emulsions. One of the promising areas is the use of ultrasound. This paper presents the results of studies on the ultrasonic treatment of four samples of emulsions with different water content (8.74; 15; 25 and 30 vol.%) based on oil from the Kumkol oilfield (Kazakhstan). Samples of emulsions were subjected to ultrasonic action at a frequency of 40 kHz for 5-60 min at a temperature of 70±1°C, followed by settling for 40 min at the indicated temperature. The influence of the initial water content in the emulsion, the acoustic intensity, as well as the duration of ultrasonic treatment on the dewatering ratio was investigated. It was found that the residual water content in the oil was 5.04- 7.82 vol.%. Ultrasonic treatment of crude oil from the Kumkol oilfield can be used for preliminary dewatering, to subsequently reduce the consumption of chemical demulsifiers.

scholarly journals Effect of ultrasonic treatment on sucrose inversion in vegetable and fruit purees

2020 ◽  
pp. 69-72
Author(s):  
L. K. Patsyuk ◽  
T. V. Fedosenko ◽  
V. V. Kondratenko ◽  
E. A. Medvedeva ◽  
T. V. Narinyants ◽  
...  
Keyword(s):  
Ultrasonic Treatment ◽  
Reducing Sugars ◽  
Ultrasound Exposure ◽  
Ultrasonic Action ◽  
Total Reducing Sugars ◽  
Flow Through ◽  
Carrot Puree ◽  
Apple Puree ◽  
Apple Purée ◽  
Control Samples

Relevance. This article presents the results of a study of the process of sucrose inversion in vegetable and fruit monocomponent purees with and without sucrose under the influence of ultrasonic action on them.Methods. For the study, experimental samples of carrot, pumpkin and Apple puree of two types were made – a monocomponent natural puree (without sugar) and puree with the addition of 5% sucrose (by weight). The main part of the study was to study the depth of sucrose inversion in experimental samples, depending on the specified parameters of ultrasound exposure at a frequency of 21.6 kHz for 30 minutes on a laboratory cavitation unit in a flow-through cyclic mode.Results. It was found that in all experimental samples, the amount of total reducing sugars increased significantly compared to the values obtained in control samples that were not subjected to ultrasonic treatment. So, in natural apple puree (without adding sucrose) after ultrasound exposure, an increase in total reducing sugars was detected by 9.3%, and in experimental samples of apple puree with added sucrose – by 10.9%, in relation to control samples, which is 1.2 times higher than in natural puree. In samples of carrot puree (without adding sucrose), the increase in total reducing sugars was 6.7%, and in puree with added sucrose, the increase was 12.2%, which is 1.8 times higher than the inversion in puree without sugar. In samples of pumpkin puree without sugar, the increase in reducing sugars was 4.2%, and in samples with added sucrose – 9.9%, i.e. 2.4 times higher than in samples without sugar.These data allow us to conclude that ultrasound exposure can intensify the inversion of sucrose with an increase in the number of reducing sugars, and this process takes place more deeply in products containing added sucrose.

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