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Article
Transesterification of Shea (Karite) and Palm Oils in Supercritical Ethanol
The biodiesel fuel synthesis process is implemented in a batch plant by the transesterification of shea (Karite) and palm oils in an ethanol medium under supercritical fluid conditions in the temperature range...
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Article
Radicals in Cellular Structures
The involvement of natural radicals in single-electron processes of cell activity is considered. It was shown that coenzymes that have intermediate free radical quinoid and semichinoid forms can interact with ...
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Article
Structural changes in Bi-43 wt % Sn eutectic alloy under superplastic deformation
Methods of scanning electron microscopy have been used to study the microstructure of superplastically deformed samples of eutectic alloy Bi-43 wt % Sn. The observed specific features of the deformation relief...
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Article
Peculiarities of the volume ratio of α and β phases in the superplastic eutectic Bi-43 wt % Sn Alloy
This work deals with the study of the volume ratio of α(Sn) and β(Bi) phases in the as-cast eutectic Bi-43 wt % Sn alloy, as well as in this alloy after casting, followed by compression in a hydraulic press to...
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Article
X-ray diffraction study of structural and phase states of a superplastic Sn-38 wt % Pb alloy and their variations under the effect of external mechanical stresses and aging
Structural and phase states of the eutectic alloy Sn-38 wt % Pb, which exhibits superplastic properties at room temperature, have been studied using samples that were cast, forged in a hydraulic press to ∼73%,...
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Article
Changes in the structural phase state and elastic and inelastic properties of superplastic eutectic Sn-38% wt Pb alloy during the aging process
We investigate how the dynamic Young’s modulus E and decrement δ change due to the compression and natural aging of eutectic Sn-38% wt Pb alloy, which exhibits superplastic properties at room temperature. We also...
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Article
Phase state of a Bi-43 wt % Sn superplastic alloy and its changes under the effect of external mechanical stresses and aging
Samples of a Bi-43 wt % Sn superplastic alloy have been studied by X-ray diffraction in the ascast state, after compression of as-cast samples to ∼70% on a hydraulic press, after aging in the as-cast and preli...
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Article
Hydrodynamic flow of the eutectic under the conditions of superplasticity
In this paper we present original experimental data indicating the manifestation of a hydrodynamic mode of deformation under the conditions of superplasticity. The investigations have been performed on a cast ...
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Article
Some aspects of superplastic flow of eutectic alloys connected with metastability
Some features of the manifestation of superplastic properties in the Pb-62% Sn alloy have been investigated depending on the duration of aging after preliminary reduction. Mechanical tests have been conducted ...
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Article
Minimax optimal placement problem for special-form objects on a multiply connected domain
An optimal placement problem for special-form objects on a multiply connected domain is considered. The objects must be disjoint and belong to a convex region that contains forbidden areas. The performance cri...
