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Article
Selecting the Temperature–Frequency Parameters of the Ultrasonic Measuring of Elastomer Figures of Merit
Ways are considered for the indirect ultrasonic measuring of elastomer figures of merit (fracture strength and Mooney viscosity), using a procedure developed for minimizing the measuring error. An ultrasonic t...
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Article
Investigation into the Change in the Composition of the Ethylbenzene Feed in a Styrene Production Reactor while Taking into Account the Partial Pressures of the Reactants
A mathematical description of ethylbenzene dehydrogenation has been developed taking into account the changes in the partial pressures and partial molar volumes of the components of the reaction mixtures. In c...
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Article
Method of Assessing the Acoustic Relaxation Polymer Spectrum
The paper presents an approach to assessing the relaxation spectrum of polymers based on experimental data obtained by ultrasonic spectrometry. The proposed approach is based on the expansion of the experiment...
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Article
Estimating the Effect of Ionizing Radiation on the Viscoelastic Properties of Volcanized Butyl Rubbers
The destruction of vulcanized butyl rubbers induced by ionizing radiation is described mathematically. A way of estimating the effect a dose of radiation has on a change in the viscoelastic properties of a pol...
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Article
Mathematical Modeling of Thermal Oxidative Degradation of Polybutadiene in Solution
A new mathematical model of the process of degradation of diene rubbers is proposed as the basis for the design of industrial reactors used for this process. It describes a homophasic thermal oxidative process...
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Article
Polymer Degradation in a Solution: Monitoring and Predicting Quality Parameters
The experimental study of polymer degradation processes in a solution is carried out. A mathematical description of the time dependences of the main polymer structural characteristics, i.e., the number average Mw
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Article
Study and Modeling of Polymer Degradation in Bulk
A mathematical description of the time dependence of the technological properties (Mooney viscosity, processability factor) and structural characteristics (molecular weight and molecular weight distribution pa...
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Article
Procedure for Determining Thermophysical Parameters of Vulcanizable Mixtures as a Function of Temperature
A procedure for calculating thermophysical parameters of vulcanizable mixtures from experimental data obtained by a laboratory unit developed by us is discussed. The procedure is based on a mathematical model ...
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Article
Determination of Parameters Assigned to an Anti-Surge Controller in a Turbocompressor Automation System
An algorithm that describes the operation of a dynamic compressor control system with anti-surge valve is presented. A technique for the use of the certified gaseodynamic characteristics of a compressor and th...
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Article
A Technique of Calculating the Kinetics of the Process of Nonisothermal Vulcanization of Large Articles
A technique of estimating the parameters of the vulcanization process based on a solution of the direct and inverse problems of the kinetics of the vulcanization process is considered. It is shown that the com...
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Article
Mathematical modeling of the multimodal distributions of elastomer relaxation spectra using the family of Pearson curves
An approach to the mathematical modeling of elastomer relaxation spectra obtained via acoustic spectroscopy is presented. The solving of Pearson differential equations is the basis for the calculated dependenc...
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Article
Estimating the molecular weight distribution of a polymer using acoustic relaxation spectra
An approach to estimating the molecular weight distribution function of a polymer in a solution using acoustic spectroscopy data is presented. The estimation function is based on the relationship between relax...
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Article
Simulating dynamic modes of polymer synthesis, based on the method of moments for multimodal distributions
Aspects of using the method of moments to simulate processes of the synthesis of polymers by means of gel chromatography are considered. Problems of modeling multimodal molecular weight distributions and their...
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Article
Numerical modeling and ballistic investigation of viscous shock layer radiation
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Article
The effect of water vapor on the distribution of the parameters of a turbulent wake
In the experimental study of phenomena occurring in the flow of air round models flying along a aeroballistic range with hypersonic velocities, the question arises of the effect of water vapor along the range ...
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Article
Approximate method for calculating the air parameters and the radiation intensity in a far wake
In the present paper an approximate method is proposed for solving wake problems that makes it possible to take into account the main features of a flow with complicated chemical kinetics. Analytic dependences...
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Article
Area rule for the wake behind a three-dimensional body
In three-dimensional flows, the local characteristics of the medium in the wake behind a supersonic body at Reynolds numbers Re ≳ 5·104 depend in a complicated manner on the coordinates. However, in a number of c...
