Effect of the operating conditions of synthesizing diene rubber with a neodymium-based catalytic system on its branching characteristics

A mathematical model taking into account the branching of a polymer is developed for the synthesis of diene rubber with a neodymium-based catalytic system (NBCS) in a cascade of continuous reactors. The model is used to study the main branching characteristics of NBCS diene rubber. Relations for calculating the average number of branches per macromolecule, average length of a main chain, average length of side chains, weight fraction of a polymer in side chains and G-factor are derived.     

Performance of double distillation in purifying liquid ammonia for use in thermal tubes

A study has been made on the effect of single and double distillation of liquid ammonia on the contents of impurities unfavorably influencing the viability of aluminum-alloy thermal tubes.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 51, No. 3, pp. 415–417, September, 1986.     

Study of construction parameters of the forceps for tooth extraction]

The paper studies the basic parameters of dental forceps, which affect the possible destruction of the tooth removed at surgery by using mathematical simulation. Evidence is provided for the truthfulness of the anatomical rule when the dentist chooses dental forceps. Emphasis is laid on the necessity of rationally using the forceps. A procedure is proposed to assess dental instruments.     

Measuring the Ultrasonic Field Generated in Water upon the Deceleration of a Proton Beam

The scanning-detector technique was used for the first time to observe the spatial–temporal structure of an ultrasonic field generated upon the deceleration and stopping in a water medium of a proton beam from the ITEP accelerator having an energy of 200 MeV and intensity of 4 × 10¹⁰. Measurements were performed in the near-field zone at 120 points that were located in the plane running through the beam axis. The latter coincided with the axis of the acoustic antenna that appeared. Contributions from three antenna segments were discriminated: from the extended middle part, the region of the maximum energy-release density at the end of the proton range (the Bragg peak), and from the plug near entrance of the beam into the water.     

Measurements of the Parameters of the Acoustic Radiation Accompanying the Moderation of an Intense Proton Beam in Water

Using the external proton beam of the accelerator at the Institute of Theoretical and Experimental Physics (ITEP), an experiment was performed on recording the acoustic signals accompanying the moderation (up to termination) of an intense proton beam with an energy of up to 200 MeV in water. The signals are damped quasi-periodic oscillations, whose initial period reflects the features of the radiating system. Parameters of the acoustic signal are measured in a wide range of energy release (from 10¹⁶to 1.2 × 10¹⁹eV) for three values of the beam diameter.     

Multicriterial classification of investment projects using fuzzy inference systems and multisets

The problem of decision taking in the task of investment project classification and selection in a multicriterial medium is considered. The project selection is performed according to a certain set of criteria. An approach to the classification of investment projects is proposed, which allows all expert opinions (including contradictory ones) to be taken into account in the classification of projects.