Controlling the softening temperature of epoxy oligomers and their mixtures

Трофимов, А. Н.; Simonov-Emel’yanov, I. D.; Pleshkov, L. V.; Zarubina, A. Yu.; Prokhorova, Yulia; Trofimov, D. A.

doi:10.1134/s1995421217020228

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…In [16] the question of appropriate choice of the multigrid parameters for the boundary-value problem (1) for the multi-layered foundation is investigated. This problem has not physical but geometric anisotropy: the length of the roadbed area considered is larger than its width and height.…”

Section: Endmentioning

confidence: 99%

“…This problem has not physical but geometric anisotropy: the length of the roadbed area considered is larger than its width and height. The determined parameters of the Multigrid Algorithm are: type of the relaxation operator (16); interpolation and projection operators (20), (18); method for creating the coarse-grid matrix A k on the levels k<K max , numbers  1 ,  2 of pre-and postrelaxation, number  of correction refinement procedures, numbers  k of précising steps in FMGalgorithm.…”

Section: Endmentioning

confidence: 99%

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Non-destructive control data analysis of railroad foundation constructions

et al. 2019

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The evaluation of the parameters of multi-layered foundations (railroad basis, foundations of railway structures, etc.) plays an important role in ensuring the safe movement of trains. The method of estimating the mechanical and geometric parameters of such foundations based on the solutions of inverse problems for multi-layered elastic packets is proposed. As input data for such problems the measured displacements of certain points on the package surface are used. The method allows estimating the parameters of the a priori distribution of unknown variable parameters, identifying and excluding outliers of the measured data from the created model, and constructing a posteriori estimation of the unknown parameters probability density with acceptable resolution. Proposed method can be used to create a new generation of equipment intended for non-destructive monitoring and estimating of the condition of the railroad basis and the foundations of artificial structures. The appropriate software of such vehicles based on the developed methods of data processing can be developed. The use of such equipment allows to operatively analyzing the state of individual areas of the railroad to decide on the need of repairing or replacing the railroad base or foundation of other elements of railroad infrastructure.

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Section: Endmentioning

confidence: 99%

Section: Endmentioning

confidence: 99%

Non-destructive control data analysis of railroad foundation constructions

et al. 2019

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“…There are experimental data on the use of sensing results for planning the development and production of oil on the oil field in Iraq [7], evaluation of the methodology for prediction of oil and gas occurrence of northwestern Colombia using remote and geophysical data [8]. Long-term geodynamic monitoring of oil and gas fields in Western Siberia by satellite radar interferometry is used [9].…”

Section: Introductionmentioning

confidence: 99%

Research methods of geological structures over hydrocarbon accumulation

Yanushkevich,

Maladzechkina,

Dauhiala

et al. 2024

E3S Web Conf.

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The article presents the results of research methods of geological structures over hydrocarbon accumulation. Measurements of the characteristics of these structures at the Geological hydrocarbon accumulation of the Republic of Belarus are made. Irradiation with a dual-frequency electromagnetic wave and reception of the reflected wave in modes with the low-frequency signal exceeding 10 times the highfrequency signal and the high-frequency signal exceeding 10 times the low-frequency signal were used. It has been established that measurement of reflection coefficient contrast between a geological structure and a homogeneous underlying profile increases the accuracy of hydrocarbon isolation. Methods of hydrocarbon deposit search based on the measurement of phase components of surface impedance in the mode of amplitude-frequency-modulated signals and determination of reflective properties of the medium over hydrocarbon accumulation in the mode of dual-frequency signals have been developed. The data of the obtained studies can be used to develop methods of hydrocarbon deposits detection.

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Carbon fiber plastics for vehicles manufactured by resource-saving formation technology

Bilym

Rogozin

Firsov

et al. 2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The advantages of the technology of molding carbon plastics based on pre-pregs with separate application of components (SAC-technology) of epoxy binders cured by the mechanism of migration polymerization of epoxy cycles are presented. Using the methods of linear dilatometry and dynamic mechanical tests, the molecular mobility of the segmental and local types in polymer matrices of carbon fiber reinforced plastics based on traditional mixed pre-pregs and binary pre-pregs with separate application of components has been investigated. The question of the influence of the activation ability of an acid catalyst during the curing of an epoxy binder on the degree of decrease in internal stresses and the realization of an increased packing density of polymer chains in the polymer matrix of the composite is considered. The importance of choosing an acid catalyst for the curing of a polymer binder is shown, which for CFRP composites provides the necessary combination of elastic and dissipative properties. The use of the considered binders makes it possible to improve a number of important operational characteristics, especially in the case of the production of large-sized products: solidity, crack resistance, impact resistance, fracture toughness. These properties are very significant during the composite materials applying in transport engineering.

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Controlling the softening temperature of epoxy oligomers and their mixtures

Cited by 3 publications

References 2 publications

Non-destructive control data analysis of railroad foundation constructions

Non-destructive control data analysis of railroad foundation constructions

Research methods of geological structures over hydrocarbon accumulation

Carbon fiber plastics for vehicles manufactured by resource-saving formation technology

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