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Aleksandr S. Ivanov
Aleksandr S. Ivanov
Leading Researcher, Ph.D.
Empress Catherine II Saint Petersburg Mining University
Leading Researcher, Ph.D.
Empress Catherine II Saint Petersburg Mining University
Saint Petersburg
Russia

Articles

Thematic volume: Processes in the depths of the Earth
  • Date submitted
    2024-05-03
  • Date accepted
    2024-10-02
  • Date published
    2024-10-31

Genetic geological model of diamond-bearing fluid magmatic system

Article preview

The article proposes a genetic geological model of diamond deposit formation associated with kimberlites and lamproites. It is based on the synthesis of published data on diamond-bearing kimberlite systems and an original study of the ontogenetic features of diamond crystals. Deep diamond crystallization, its upward transportation and subsequent concentration in near-surface kimberlite-lamproite bodies and other rocks, including those brought to the surface by high-amplitude uplifts of crystalline basement rocks, are combined in a single system. An assumption is made about the primary sources of the Anabar placer diamonds. The possibility of hydrocarbon generation at mantle levels corresponding to diamond formation areas and their transportation to the upper crustal zones by a mechanism similar to the mantle-crust migration of diamond-bearing fluidized magmas is shown. The high rate of their upward movement allows transportation to the surface without significant loss as a result of dissolution in melts and sorption on the surface of mineral phases. The significant role of fluid dynamics at all stages of this system is noted.

How to cite: Kozlov A.V., Vasilev E.A., Ivanov A.S., Bushuev Y.Y., Kolyadina A.I. Genetic geological model of diamond-bearing fluid magmatic system // Journal of Mining Institute. 2024. Vol. 269. p. 708-720. EDN CFZLAK
Metallurgy and concentration
  • Date submitted
    2018-01-02
  • Date accepted
    2018-03-08
  • Date published
    2018-06-25

Noncontact laser control of electric-physical parameters of semiconductor layers

Article preview

Non-contact non-destructive laser-interferometric methods for measuring several electrophysical parameters of semiconductor and dielectric layers are proposed. They are the lifetime of charge carriers for electrons and holes separately; parameters of recombination centers, namely their concentration and capture cross-sections; bulk volume lifetime and rate of surface recombination, as well as the diffusion length of charge carriers. The methods are based on the interference-absorption interaction in a semiconductor of two laser radiations with different wavelengths. Short-wave injection radiation generates additional charge carriers in the material, which leads to a change in its optical constants at the wavelength of the other – long-wavelength probing laser radiation – and to modulation of this radiation as it passes through the sample of the studied material. The means for implementing the proposed methods and methods for processing the modulation signal for determining the parameters of the investigated samples are developed. The methods have been successfully tested on samples of such materials as germanium, silicon, indium antimonide and cadmium-mercury-tellurium alloy. It is shown that the methods can be used both in scientific research and electronic industry.

How to cite: Fedortsov A.B., Ivanov A.S. Noncontact laser control of electric-physical parameters of semiconductor layers // Journal of Mining Institute. 2018. Vol. 231. p. 299. DOI: 10.25515/PMI.2018.3.299
Geotechnical engineering, powerengineering and automation
  • Date submitted
    2008-09-29
  • Date accepted
    2008-11-10
  • Date published
    2009-03-01

Structure and control algorithms of sensorless frequency controlled electric drive for mining machines

Article preview

In clause the urgency of transition from traditional gauges of electric drives of a dredge to nogauge is shown to the observer of the basic coordinates, the mathematical model of the adaptive observer for a drive of rise of a dredge is proved and created.

How to cite: Ivanov A.S. Structure and control algorithms of sensorless frequency controlled electric drive for mining machines // Journal of Mining Institute. 2009. Vol. 182. p. 85-87.
Electric drive, power supply, automation and control of mining and oil and gas production
  • Date submitted
    2007-11-26
  • Date accepted
    2008-01-10
  • Date published
    2008-05-01

Pilot diagnostics of mining machines transmissions state by parameters of electric drive supply

Article preview

For diagnosing transmission of the mountain machine without installation of expensive gauges pilot diagnostics on parameters of a feed of the electric motor, based on the assumption can be used, that the majority of the indignations arising in transmission and influencing at the moment of resistance, overcome by the engine, affects change of instant power consumed by the electric motor.

How to cite: Poddubnaya A.A., Fokin A.S., Ivanov S.L., Ivanov A.S., Semenov M.A. Pilot diagnostics of mining machines transmissions state by parameters of electric drive supply // Journal of Mining Institute. 2008. Vol. 178. p. 159-161.
Geotechnical engineering, powerengineering and automation
  • Date submitted
    2006-11-22
  • Date accepted
    2007-01-13
  • Date published
    2007-05-01

Development of structure and algorithm of control of escalator drive with basic coordinates observer

Article preview

The paper demonstrates the necessity to introduce efficient adjustable electric drives for inter-floor moving ramps; a mathematical model has been created for an automatic drive control system and a mathematical model of the adaptive observer for the ramp drive has been justified and created.

How to cite: Ivanov A.S. Development of structure and algorithm of control of escalator drive with basic coordinates observer // Journal of Mining Institute. 2007. Vol. 173. p. 80-82.
Mining electromechanics
  • Date submitted
    2006-07-04
  • Date accepted
    2006-09-06
  • Date published
    2007-01-01

Structure and mathematical model of asynchronous frequency electric drive without main coordinate sensors

Article preview

Wind is one of the most important alternative sources of energy, the distinguishing features of which are zero cost and no negative impact on the environmental situation. In view of the increasingly worsening fuel and energy crisis, interest in the use of wind energy has increased significantly over the past few years. Data on the structure of a wind power plant are given. Asynchronous machine with squirrel cage rotor is considered as a generator. A model of an autonomous induction generator is constructed taking into account the nonlinearity of the magnetic circuit. The model for automatic construction of mechanical characteristic of asynchronous machine is also presented. Modeling is performed in the MatLab Simulink environment.

How to cite: Ivanov A.S. Structure and mathematical model of asynchronous frequency electric drive without main coordinate sensors // Journal of Mining Institute. 2007. Vol. № 1 170. p. 50-53.
Mining electromechanics
  • Date submitted
    2005-06-09
  • Date accepted
    2005-07-24
  • Date published
    2006-01-01

Intellectual algorithms of electric drive control of oil and gas pumping units on the basis of neural networks

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The article considers alternative possibilities of controlling electric drives of oil pumping units with the help of intelligent neural networks, models of traditional and modern sensorless coordinate observer, their comparison is carried out.

How to cite: Ivanov A.S. Intellectual algorithms of electric drive control of oil and gas pumping units on the basis of neural networks // Journal of Mining Institute. 2006. Vol. № 1 167. p. 171-174.
Mining electromechanics
  • Date submitted
    2003-06-13
  • Date accepted
    2003-07-16
  • Date published
    2004-01-01

Structure of the electromechanical part and synthesis of the stepper machine motion control algorithm for deep-sea research

Article preview

The Russian Federation is one of the largest miners and exporters of natural resources worldwide. The mineral reserves at the bottom of the world's oceans are many times greater than those on land, which makes it necessary to develop fundamentally new equipment for their extraction. One of the most interesting solutions to this problem is a double-supported walking machine. The issues devoted to the development of the structure and algorithm of controlling the motion of the walking machine for mining minerals from the seabed are considered. A mathematical model of the electromechanical drive for turning the chassis during stepping is proposed, technical requirements to the electromechanical drives of the machine are stated and the control algorithm of the non-contact electric drive is described.

How to cite: Ivanov A.S. Structure of the electromechanical part and synthesis of the stepper machine motion control algorithm for deep-sea research // Journal of Mining Institute. 2004. Vol. № 1 159. p. 114-116.