2021 №1(35)https://rep.ksu.kz//handle/data/107952022-08-14T11:36:00Z2022-08-14T11:36:00ZThe study of curves of the transient current in polytetrafluoroethylene by means of Fourier analysisTurdybekov, K.M.Turdybekov, M.K.https://rep.ksu.kz//handle/data/108702021-05-06T19:04:21Z2021-03-30T00:00:00ZThe study of curves of the transient current in polytetrafluoroethylene by means of Fourier analysis
Turdybekov, K.M.; Turdybekov, M.K.
Experimental transition current curves for polytetrafluoroethylene after exposure to high-energy ionizing
radiation are obtained. The transient current curves in irradiated polytetrafluoroethylene are analyzed based on
the discrete Fourier transform. It is shown that there is an intense maximum of dielectric absorption in the infralow frequency region. This maximum is characterized by abnormally large values of the dielectric increment,
permittivity, and the dielectric loss factor. It is concluded that the volume polarization of the irradiated
polytetrafluoroethylene is uniform. The polarization observed in this frequency range is associated with the
activation of migration of trapped charge carriers within microscopic regions.
2021-03-30T00:00:00ZInvestigation of the thermophysical characteristics of minerals at various heating parametersShaimerdenova, K.M.Stoev, M.Sekerbayeva, G.K.Bulkairova, G.A.Ospanova, D.A.Tussypbayeva, A.S.Rakhmankyzy, A.https://rep.ksu.kz//handle/data/108692021-05-06T19:04:19Z2021-03-30T00:00:00ZInvestigation of the thermophysical characteristics of minerals at various heating parameters
Shaimerdenova, K.M.; Stoev, M.; Sekerbayeva, G.K.; Bulkairova, G.A.; Ospanova, D.A.; Tussypbayeva, A.S.; Rakhmankyzy, A.
The study of natural minerals in the production of heat and electrical insulating materials is of particular
practical interest for the study of their thermophysical characteristics. The regularities of changes in the heat
capacity of minerals when heated in production and operating conditions are of particular interest. Natural
minerals of wollastonite and quartz were considered as the object of research. The heat capacity of these minerals
was measured in an apparatus with a three-dimensional sensor and a panel for automatic control of gas flows,
when heated to the temperature of 1600ºС by the calorimetric method. Based on the experimental results, graphs
of the dependence of the heat capacity of mineral samples on temperature were constructed.
2021-03-30T00:00:00ZInfluence of the impact of acoustic cavitation on the physical and chemical properties of waterDyussenov, K. M.Sakipov, K.E.Shayakhetova, R.T.Nedugov, I.A.Aitmagambetova, M.B.Yessimseit, A.K.https://rep.ksu.kz//handle/data/108682021-05-06T19:04:17Z2021-03-30T00:00:00ZInfluence of the impact of acoustic cavitation on the physical and chemical properties of water
Dyussenov, K. M.; Sakipov, K.E.; Shayakhetova, R.T.; Nedugov, I.A.; Aitmagambetova, M.B.; Yessimseit, A.K.
The article presents the results of an experimental study of the changing the ionic composition of water
under the influence of acoustic cavitation. The effect of acoustic radiation on the physical and chemical properties
of water was studied in the frequency range 20 Hz - 50 kHz. It is shown that the ultrasonic range leads to an
increase in the concentration in the area of metal traces and affects the change in the pH of water. The
mechanism of action of cavitation leads to a change in the structural characteristics of water. It is shown that one
of the manifested effects of ultrasonic cavitation can be used for various applications.
2021-03-30T00:00:00ZEfficiency analysis of using a combination of air and ground heat pumps for heating and ventilationBezrodny, M.K.Oslovskyi, S.А.https://rep.ksu.kz//handle/data/108672021-05-06T19:04:15Z2021-03-30T00:00:00ZEfficiency analysis of using a combination of air and ground heat pumps for heating and ventilation
Bezrodny, M.K.; Oslovskyi, S.А.
The article considers the energy efficiency of the combination of two most common heat sources for heat
pumps, namely soil and ambient air. A feature of such a system is the connection of air and ground heat pumps in
series with water. A computational model of the proposed system is developed, based on the system of equations
for heat and material balances of the system. The result of the analysis was a system of equations, the analysis of
which made it possible to study the two main characteristics of energy efficiency, namely, the relative heat load of
the ground heat exchanger and the specific total costs of external work for the drive of the system, depending on
the depth of utilization of the heat of ventilation emissions. It is shown that a positive effect from the use of a
heating and ventilation system with two heat pumps, both in terms of energy and investments, can be achieved
with the utilization depth of ventilation emissions corresponding to the condition of equality of the conversion
factors for air and ground heat pumps.
2021-03-30T00:00:00Z