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Vol 218

Geology
  • Date submitted
    2016-10-04
  • Date published
    2016-02-01

Results of the 5G borehole drilling at russian antarctic station «Vostok» and researches of ice cores

We produce an information about results and features of the 5G borehole drilling in Antarctic layer at Russian station Vostok. Main regularities of the change structured and physical properties by Antarctic ice layer depth, which determine mechanical and reological properties if ice, which influence to sinking of a borehole and to the maintaining of it in a working condition, the safe and competitive technologies creation for drilling of strong ice layers and the environmentally safe technology of the subglacial reservoirs unsealing. We also produce results of the ice cores researching and the paleoclimatic raws construction, which are reconstructed by the ice cores researching from Vostok station, which is compared with isotopic graph. This graph describes changes of World ocean level.

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N. I. Vasil'ev, A. N. Dmitriev, V. Ya. Lipenkov (2016) Results of the 5G borehole drilling at russian antarctic station «Vostok» and researches of ice cores. Journal of Mining Institute. Vol 218. p. 161.
Geology
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Crisis in mica production industry of the Belomorskaya pegmatite province and perspective of its overcoming

The crisis of the Belomorian pegmatite province mica sector and perspectives of its overcoming causes and consequences of the mica sector crisis in the North-West Belomorie related to studies and a production of lamellar micaceous pegmatite is discussed. The alternative importance of the unique deposit in the Mezhozernoe (Eastern Hizovaara, Northern Karelia) – primary source of scarceness lamellar light mica is confirmed. The results of mineralogical and technological researches show that it is a promising target for mining and processing a small ferrous flake muscovite.

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N. D. Malov, V. V. Shchiptsov (2016) Crisis in mica production industry of the Belomorskaya pegmatite province and perspective of its overcoming. Journal of Mining Institute. Vol 218. p. 172.
Geology
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Platinum specialization of supergene nickel deposits on ultramafic massifs of the Urals

This paper presents an analysis of geochemical data obtained as a result of persistent research of the Buruktal, Ufalei, Elov and others supergene nickel deposits of the Urals on the content of precious metals. Content and distribution of platinum group elements, gold and silver in oxide–silicate nickel ores are compared with their content in initial dunite-harzburgite bedrock. It was revealed that all the PGE accumulate in supergene nickel deposits. Geochemical specialization of PGE mineralization of supergene nickel deposits is determined by palladium and platinum, while in dunite-harzburgite substrate of primary ophiolitic massifs major platinoids are ruthenium, osmium and iridium. Pt/Pd ratio is generally less than 1, i.e. palladium is dominating in them with some exceptions.

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I. V. Talovina (2016) Platinum specialization of supergene nickel deposits on ultramafic massifs of the Urals. Journal of Mining Institute. Vol 218. p. 179.
Geology
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Isolation of promising areas to drill for unconventional hydrocarbons petrikovskih sediments Davydovskogo deposit Pripyat Trough

Pripyat Trough is the only oil basin in the territory of the Republic of Belarus. Mining is carried out within the basin for 50 years. During this time, the proportion of active stocks decreased significantly, while the share of hard-to-inventories increased. Therefore, due to the depletion of traditional reserves, urgent problem arises in the study and production of unconventional hydrocarbon traps. To this type of traps are Petrikov deposits Davydov field. These deposits have low permeability and capacitive properties, but at the same time in a number of wells in the test sediment in Colon yielded commercial oil inflows. Some of the well in a certain period of development led oil from Petrikov deposits. In similar deposits Rechitsa field yielded commercial oil inflows in drilling horizontal wells with hydraulic fracturing. Until recently, the reservoir Petrikov deposits was listed among the off-balance sheet reserves after drilling – reserves transferred to the balance of C1. Therefore, the input to the development of stranded there is a need to identify the most promising area for drilling horizontal wells, followed by hydraulic fracturing. To perform this work was carried out pointwise interpretation of GIS for all wells Davydov field, the results of which built the geological and petrophysical model of the deposit. Also, the analysis of core samples, the results of drilling. Produced dismemberment Petrikov deposits on two subhorizon on the results of the interpretation of GIS and well logs. The outcome of the work performed is a recommended site for drilling.

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E.I. Shevelev (2016) Isolation of promising areas to drill for unconventional hydrocarbons petrikovskih sediments Davydovskogo deposit Pripyat Trough. Journal of Mining Institute. Vol 218. p. 191.
Oil and gas
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Technical and technological solutions to ensure stability of downhole drilling motors

The article shows research analysis of engineering and technological solutions that aimed at improving the efficiency of drilling wells using optimization of dynamic of work downhole drill-ing motors. As the technical solutions that reduce vibration, considered two options of construc-tion of the power section. A first embodiment involves the production of a hollow rotor which can reduce its moment of inertia. The second solution is the production of modular rotor, which are changing the eccentricity (misalignment) of rotating parts of the engine. The research of fluctuations throughout the length of the power section of the working bodies and the spindle of the engine, taking into account changes in its energy characteristics has been con-ducted to ensure stable operation of the engine in a well, identifying optimal loading parameters. Indicators of shaft speed ensuring minimum vibration amplitude of the engine has been Iden-tified. Optimal speed range of the rotor to prevent buckling of the BHA and to sustain its operation is shown to be between 15-20 % of the frequency of the engine at idle. The maximum reduction in speed during the drilling process should not exceed 30 % by conducted research.

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M. V. Dvoinikov, Yu. D. Muraev (2016) Technical and technological solutions to ensure stability of downhole drilling motors. Journal of Mining Institute. Vol 218. p. 198.
Oil and gas
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

The modern technology of drilling and casing of well during the exploration of gas hydrates

In the paper, the perspectives of exploration and completion of gas hydrate fields and the drilling problems in the gas hydrates of the northwest china are studied. It has been established, that the main reasons of complications in the Muli field are the secondary hydrate formation on the walls of the well and drilling assembly and ice formation inside the set cement during the well drilling and completion in permafrost. It has been shown, that in the areas with permafrost during the drilling of the layers containing gas hydrates, temperature and pressure changes can lead to the dissociation of hydrates. At the same time, pressure increase in the annular space due to the gas release, can lead to the secondary formation of gas hydrates, drill string stuck, ceasing of drilling fluid circulation, which is the reason of serious trouble in the wellbore. The results of the research on the development of drilling fluids compositions, which lower the drilling troubles of permafrost, are presented. Comparative experiments have been conducted to evaluate the effectiveness of thermodynamic and kinetic inhibitors, which prevent the repeated hydrate formation. It has been established, that the kinetic inhibitors have the clear advantage: they have good inhibiting effects even with low amounts of additives. In the laboratory conditions, the researches have been conducted to evaluate the phase equilibrium of gas hydrates during their reaction with the water solutions, containing kinetic inhibitor PVP. A thin clay drilling mud has been developed on the water base, providing the holding of the temperature in the level of –2 °С and its effectiveness for the gas hydrate fields in the PRC has been shown. Casing effectiveness of unstable rocks during the drilling in the conditions of negative temperatures inside the well largely depends on their physical-mechanical properties, composition and the technical indicators of cement materials. The authors suggest the composition of quick-setting cements based on aluminum binding materials. It has been established, that the analyzed compositions have the ability to considerably improve the results of cementing. 

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N. I. Nikolaev, Lyu Tyan'le (2016) The modern technology of drilling and casing of well during the exploration of gas hydrates. Journal of Mining Institute. Vol 218. p. 206.
Oil and gas
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

The building a system of diagnosing the technical condition of the pipeline on the basis of continuous pulsed magnetic field

Modern diagnostic systems do not always satisfy the requirements of the oil workers. At the moment, it is impossible to assess the overall technical condition of the pipeline without huge costs on operation diagnostic system. The article deals with the main problems of diagnostics of oil pipelines. The principle of operation of the pipeline system diagnostics using pulsed DC mag-netic field. This system allows you to assess the long section of the pipeline without interfering with the operation of the plant. A large network of pipelines can be controlled by separate sections that are connected to the console controller at a time. These sites can be branched. They must be connected by analogy with the four-pole. For information carrier assumes a constant magnetic field, the range of spread of the ferromagnetic conductor is not limited. The block diagram of the proposed diagnostic system with a brief description of each item is present in the article. The basic calculation power of the magnetic field. Show original signal, and the signal is converted because of the fault of the pipe walls: cracks, cavities, orifices. Walking through these places in the line, the magnetic field at the injury site experienced reflection, refraction, inter-ference, creating extra- that distorts the rectangular modulation constant magnetic field.

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R. M. Proskuryakov, A. S. Dement'ev (2016) The building a system of diagnosing the technical condition of the pipeline on the basis of continuous pulsed magnetic field. Journal of Mining Institute. Vol 218. p. 215.
Metallurgy and concentration
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Extraction of ions of silver from hydrochloric acid solutions by tributylphosphate

The high results of the silver ions extraction from the hydrochloric acid solutions of tributylphosphate during extractant portional introduction were obtained. The extractant batch inclusion increases silver extraction process and reduces the extractant expenditure. The best extraction results were obtained for the solutions with concentration 3N HCl, 240 NaCl g/dm 3 and temperature t  = 20 °C. The principal technological scheme of the silver ions extraction from the hydrochloric acid solutions is presented.

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L. A. Voropanova, N. B. Kokoeva (2016) Extraction of ions of silver from hydrochloric acid solutions by tributylphosphate. Journal of Mining Institute. Vol 218. p. 220.
Metallurgy and concentration
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Processing of alumina production red mud with recovery of scandium concentrate

The chemical and technological principles of scandium recovery from red mud of alumina production with the use of flue gases from sintering furnaces have been developed. The optimal conditions of hydrochemical processes of successive removal of impurities for the production of scandium concentrate with simultaneous obtaining of titanium-containing product have been worked out on a pilot plant.

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I. N. Pyagai, V. L. Kozhevnikov, L. A. Pasechnik, V. M. Skachkov (2016) Processing of alumina production red mud with recovery of scandium concentrate. Journal of Mining Institute. Vol 218. p. 225.
Electromechanics and mechanical engineering
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

The method for synthesis of power supply system topology of mineral resources enterprises on the basis of logical and probabilistic assessments

A method for the synthesis of the power supply system topology of mineral resources enterprises. The expediency of using general logic probabilistic method and developed on the its basis software «ARBITR» to calculate the reliability of power supply systems. The synthesis results of power supply system topology on the example of underground mining and gas transmission systems consumers. Recommendations to improve the power supply reliability of mineral resources enterprises.

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B. N. Abramovich, S. V. Baburin (2016) The method for synthesis of power supply system topology of mineral resources enterprises on the basis of logical and probabilistic assessments. Journal of Mining Institute. Vol 218. p. 233.
Electromechanics and mechanical engineering
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Vibrodiagnostics of the technical state slurry pumps

Analysis of the work hydrotransport systems in processing plants shows that the efficiency of this type transport does not match its technical capabilities: the high laboriousness involved in the operation of the equipment, high hydroabrasive wear of slurry pumps and pipelines, low working life pumps, high metal consumption and energy. The main reason for the lack of effectiveness of hydraulic transport is hydroabrasive wear impellers of slurry pumps, causing rising levels of vibra-tion pumps, reducing the pressure characteristics, general technical state of hydrotransport system and as a result - low pumps life, not exceeding 500 hours of continuous operation. In paper, it is shown that as a criterion of period normal operation slurry pump can be used coefficient of techni-cal state, the value of which is proportional to the relative head, degree of hydroabrasive wear of the impeller and time of continuous operating. The coefficient technical state of slurry pump can be represented as a function of current flow rate and the RMS value of vibration velocity. The re-sults of theoretical and experimental studies used to develop algorithms and techniques express-diagnosis and monitoring of slurry pumps in hydrotransport system, data which indicate the need for routine maintenance of pumping equipment.

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V. I. Aleksandrov, Irzhi Sobota (2016) Vibrodiagnostics of the technical state slurry pumps. Journal of Mining Institute. Vol 218. p. 242.
Electromechanics and mechanical engineering
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Low-voltage electrical apparatus

The article describes the main trends in the development of low-voltage electrical appliances and related accessories, as well as issues of efficiency, reliability and safety. According to the authors, the main trends in the development of low-voltage apparatus can be considered: the transition from the use of certain devices to the system devices, unified by the process of installation and running in standard modules and comply with all the functional requirements of control systems; improving the standardization and normalization of the EA on an international scale; unification of constructive elements of the EA; increase the volume of production of complete device management and contactless application logic control systems and specialized computers for management purposes; increase the proportion of contactor relay equipment DC, performs a variety of control functions. Improved security service low voltage, through the use of low voltage (24 V DC, 110 V AC), voltage presence signaling devices; increase the proportion of and the use of combined control and protection devices as well as devices for the automation of recruitment and duty cycles of machines: differentsequencer, track control devices, relays, pulse counting, and so on. n.

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S. M. Apollonskii, Yu. V. Kuklev (2016) Low-voltage electrical apparatus. Journal of Mining Institute. Vol 218. p. 251.
Electromechanics and mechanical engineering
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Energy efficient electromechanical systems of mining andtransport machines

The problems of selecting the type and the structure of mining and transport machines elec-tromechanical control system, providing energy efficiency and performance. The conclusion about the most admissibility of variable frequency drives with induction motors and power semiconduc-tor converters was made. The methods and technical means of improving the energy efficiency of asynchronous electric motors due to the choice of increased power characteristics motors, design of special motor control algorithms and applying of semiconductor converters with active rectifi-ers, providing high power factor and improving of the electricity supply quality were reviewed. To improve the operational characteristics prompted use of diagnostic systems and residual life as-sessment of electrical equipment. Implementation of designs tied to the excavator-transport sector. The schemes of the excavator power drive, mining truck and implemented complex picture at coal mine are shown.

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A. E. Kozyaruk (2016) Energy efficient electromechanical systems of mining andtransport machines. Journal of Mining Institute. Vol 218. p. 261.
Electromechanics and mechanical engineering
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Energy- efficient control of asynchronous motor drive with current refinement of the loss minimum on the basis of fuzzy logic

Currently, asynchronous electric drive on the basis of semiconductor frequency converters is widespread because of the relative simplicity and reliability of the design, the use of digital control systems, providing the accuracy and flexibility of process control, which allows for a significant increase in product quality, reduction in energy consumption and improvement of the enterprise profitability. In spite of these advantages, the problem of ensuring high energy efficiency of the drive in wide range of its operational modes is still not solved in full scale. The paper is devoted to the reduction of losses in the asynchronous drive on the basis of en-ergy-saving control algorithms that aim to ensure the desired mode of the driven mechanism while minimizing losses in copper and steel of the motor. On the basis of the motor model, taking into account magnetic losses, dependences of losses in the copper and steel, as well as the total loss from the absolute slip have been derived for different operating points of the drive. The optimal values of the absolute slip for different speeds of the rotor have been obtained for use in the con-trollers ensuring operation of the drive at maximum efficiency, highest power factor and minimum of the stator current. For minimizing the losses in the drive when changing the motor parameters it has been offered the combined method based on the method of loss model and iterative method of searching the minimum of power consumption. The effectiveness of the proposed control system using fuzzy logic is confirmed by comparing the graphs of losses and efficiency, obtained at using a traditional control law and the optimal control law.

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O. B. Shonin, V. S. Pron'ko (2016) Energy- efficient control of asynchronous motor drive with current refinement of the loss minimum on the basis of fuzzy logic. Journal of Mining Institute. Vol 218. p. 270.
Electromechanics and mechanical engineering
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Reserch of modernized perforator-hammer for drifting special roadway the underground mines «Metrostroy»

The article describes the design of modernized hammer-perforators for tunnel complexes for construction of auxiliary mine workings of «Metrostroi», St Petersburg, protected by patents. The article deals with assembly variants of the executive device of percussion type for breaking faces of complicated structure. Particular attention is paid to hammers working in the mode of the «counter-shearing» accomplished by dual jackhammers. The results of experimental tests to determine pike penetration into rock array for different values of rock hardness and pressing force. It is noted that the proposed solution replaces manual labor, reduces working cycle time.

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D. A. Yungmeister (2016) Reserch of modernized perforator-hammer for drifting special roadway the underground mines «Metrostroy». Journal of Mining Institute. Vol 218. p. 281.
Geoecology and occupational health and safety
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Ecological aspects of vehicle tunnels ventilation in the conditions of megalopolises

The characteristic of Russia and foreign vehicle tunnels are provided in paper and advantages of their placement in the conditions of the city are noted. It is shown that one of the main factors defining negative impact on environment in the period of tunnels driving is mine equipment, and at operation – vehicles. The analysis of essential differences of features of pollution of atmospheric air at construction of tunnels from its pollution at construction of buildings on a surface is given. The examples illustrating levels of negative impact of the upcast ventilation shaft airflow on atmospheric air are given and the ventilation schemes reducing this influence are offered. It is shown that during operation of road tunnels of pollution of the air environment can extend on considerable distances from tunnel portals. Numerical calculations of concentration of carbon oxides and nitrogen during removal of the upcast ventilation shaft airflow through portals and through the mines built near them are executed. Technical solutions on purifications of tunnel air by means of electrostatic filters are described.

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S. G. Gendler (2016) Ecological aspects of vehicle tunnels ventilation in the conditions of megalopolises. Journal of Mining Institute. Vol 218. p. 313.
Geoecology and occupational health and safety
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Ways to ensure reliability, safety and efficiency of the costruction and installation works when buildings and structures erecting by stabilizing process of the rocking cargo suspension

Nondestructive optical methods for measuring of the «thick» films thickness of the order of 0,001-1,00 mm are analyzed. It is shown that using the laser beam radiation and modern optical and electronic schemes possible to decrease the time of single measurement to 1ms and less at the measuring frequency of 10-50 hz. The possibility of measuring thickness and spreading coefficient and evaporation kinetics of liquid films is demonstrated. A new computer method of the data processing aimed to determine the film thickness from the angle dependence of the laser beam reflection coefficient by the film is offered. The offered procedure and the experimental technique realizing it permits to decrease the thickness determination uncertainty to the order of ten.

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L. A. Goldobina, P. S. Orlov (2016) Ways to ensure reliability, safety and efficiency of the costruction and installation works when buildings and structures erecting by stabilizing process of the rocking cargo suspension. Journal of Mining Institute. Vol 218. p. 322.
Geoecology and occupational health and safety
  • Date submitted
    2016-10-06
  • Date published
    2016-02-01

Inorganic and organic vitreous foam materials and prospect of environmental cleaning from oil and oil products pollutions

The analysis of own experimental materials which are part of the new scientific direction – complex research of physical and chemical regularities of novel inorganic and organic vitreous sorbents and investigation of the oil and oil products absorption processes by that sorbents developed on department of the General and Physical Chemistry of National Mineral Resources University (Mining University) under the leadership of the author of this paper is provided. In particular, specifics of kinetic curves of oil absorption for sorbents with a vitreous surface are experimentally established and theoretically proved by the conducted researches.

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V. E. Kogan (2016) Inorganic and organic vitreous foam materials and prospect of environmental cleaning from oil and oil products pollutions. Journal of Mining Institute. Vol 218. p. 331.
Geoecology and occupational health and safety
  • Date submitted
    2016-10-06
  • Date published
    2016-02-01

Development of innovative technologies of dedusting in mining and advance coal mine faces

The article describes the results of the implementation of investment projects in the field of complex dedusting implemented in major coal producing companies in Russia. Experimental study of the processes reduce the levels of dust in the workplace in the application of modern systems of irrigation and aspiration systems. The factors that determine the mass and composition of particulate airborne dust at various ways of dust suppression. The results of the analysis of the laser dispersed composition of particles removed from the air of the working area

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G. I. Korshunov, S. B. Romanchenko (2016) Development of innovative technologies of dedusting in mining and advance coal mine faces. Journal of Mining Institute. Vol 218. p. 339.
Geoeconomics and Management
  • Date submitted
    2016-10-06
  • Date published
    2016-02-01

Problems development of the offshore oil and gas fields deposits

Based on the fact that the development of offshore fields that contain huge reserves of hy-drocarbons, is a key area to overcome the negative trends in the oil and gas industry. The article identifies ways to improve the organization and management of the development of the Arctic shelf from a methodological and practical point of view. Three groups of problems of increase of efficiency of interaction of oil and gas companies to governments and companies from other countries: 1) Institutional (taxation, production sharing agreements, concession regime and others.); investment (extension of the list of investment risks and methodical study of their principles); innovation (creation of a new generation of oil and gas equipment, marine oil and gas innova-tion clusters) and the ways to solve them.

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V. M. Vasil'tsova (2016) Problems development of the offshore oil and gas fields deposits. Journal of Mining Institute. Vol 218. p. 345.
Geoeconomics and Management
  • Date submitted
    2016-10-06
  • Date published
    2016-02-01

Development of institute of financial control in construction

The article is devoted to the complex research of development of Institute of financial control in construction. Based on the analysis of approaches of researchers to definition of concept «financial control», sets out its objectives and importance. Identifies and describes the characteristic features of state and non-state financial control. To examine the existing mechanisms of financial control system in construction in General, to prevent violations and to create the basis for the adoption of specific management decisions, it is proposed to study three main areas. Special attention is paid to the analysis of the current legislation in the field of formation of financial control in the construction and practice of its application. Presents substantial changes in the legal regulation of the contract system in the sphere of procurement for state and municipal needs, including the adjustment of the scheme of carrying out of competitive procedures by the customer. In this regard, an important role plays the method of calculation of the final rating of participants of procurement procedures, allowing to determine the winner in accordance with predetermined criteria and their weighting factors. This area is also complemented by the consideration of issues related to the establishment of the procedure for the implementation of banking support contracts, allowing to provide the customer more effective control over the observance of contractual obligations with suppliers (contractors, performers). The conducted researches allow to draw a conclusion about the need to rethink and address issues related to efficiency of use of budget investments in objects of capital construction. In this regard, the main priorities of improving financial control in the construction industry to achieve the desired rates of economic development. 

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V. P. Grakhov, O. L. Chazova (2016) Development of institute of financial control in construction. Journal of Mining Institute. Vol 218. p. 351.
Geo-nanomaterials
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Multicriteria estimation of bearing capacity of geomaterials

In the article the problem of an estimation of bearing capacity of geomaterials as a deform-able solid is considered in the current configuration, which may be as the reference (undeformed) or the actual (deformed). We propose an original variational approach to the problem for stresses in selected subdomains, in which, depending on different engineering considerations, average in-tegral values of different component of stresses are estimated and from their aggregate the bearing capacity of the current configuration of the solid is estimated regarding to given external influ-ences. In each of the selected subdomain the weakest stress field is obtained which is globally bal-anced with external influences. For example, the assessment of the average integral hydrostatic pressure is needed for study of bearing capacity of geomaterials.

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I. A. Brigadnov (2016) Multicriteria estimation of bearing capacity of geomaterials. Journal of Mining Institute. Vol 218. p. 289.
Mining education: traditions and perspectives in the XXI century
  • Date submitted
    2016-10-06
  • Date published
    2016-02-01

History and philosophy of science in technical and mining-geological education in modern Russia

The paper describes the manner to teach history and philosophy of technical sciences in today’s Russia. The conventional concept of philosophy of science is examined, in particular, in its application to technical sciences. Didactic peculiarities of the history and philosophy of science course as it is taught in Russia to PhD students, within an example of academician V.S. Stepin’s manuals, are analyzed. Concepts of the role philosophical courses play to enrich students’ scholarly training are discussed. It is underlined that the didactics based upon the belief into the rationality of the whole «world system» and into the right way in understanding its «foundations» is still preserved everywhere. It is important for philosophers to deal with describing and studying contexts which are not taken into account by disciplinary paradigms. Three levels, on which student and PhD students meet philosophy, form a unity. Collaboration and intellectual exchanges between teachers and students on the two highest levels can be turned into an abundant source of the essential information for teachers.

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M. I. Mikeshin (2016) History and philosophy of science in technical and mining-geological education in modern Russia. Journal of Mining Institute. Vol 218. p. 359.
Mining education: traditions and perspectives in the XXI century
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Analysis of charge space distribution influence on electric adhesion forces

Modeling ideas of physical and chemical processes when using an anodic bonding for materials connection are developed. The kinetics of a charge accumulation in an electrode region in a dielectric is considered. The thickness of a charge layer, electric fields strength and value of the ponderomotive pressure providing connection of materials are calculated. It is shown that the necessary ponderomotive pressure resulting in a dielectric-to-conductor seal is normally about ten megapascal and the time required is about ten minutes. The appearance of great pulling electric fields at anodic bonding process with a conductor surface to dielectric turns out to be possible due to the interlayer polarization developing in dielectric under the action of electric voltage. This results in a negative charge accumulation in a layer of small thickness beside anode. Thus applied electric voltage is distributed not through the whole thickness of a dielectric, but in fact is applied to a narrow area of the three-dimensional charge be-side anode. Arising strong electric fields force the connected materials to unite. The physical and mathematical models for force characteristics of non-uniform electric field are developed. Dependences of parameters of anodic bonding junction on time are considered. The expressions allowing to choose well-founded time of formation of anodic bonding junction are obtained, intensity of electrostatic fields and forces in dynamics is calculated. Research of a charge intermittence influence on electrostatic field strength has shown a considerable differences on small distances to the charged surface between carried out and traditional ways of calculation.

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N. S. Pshchelko (2016) Analysis of charge space distribution influence on electric adhesion forces. Journal of Mining Institute. Vol 218. p. 296.
Mining education: traditions and perspectives in the XXI century
  • Date submitted
    2016-10-05
  • Date published
    2016-02-01

Increasing the accuracy of the fast laser measurments transparent solid and liquid films thicknesses

Nondestructive optical methods for measuring of the «thick» films thickness of the order of 0,001-1,00 mm are analyzed. It is shown that using the laser beam radiation and modern optical and electronic schemes possible to decrease the time of single measurement to 1ms and less at the measuring frequency of 10-50 Hz. The possibility of measuring thickness and spreading coefficient and evaporation kinetics of liquid films is demonstrated. A new computer method of the data processing aimed to determine the film thickness from the angle dependence of the laser beam reflection coefficient by the film is offered. The offered procedure and the experimental technique realizing it permits to decrease the thickness determination uncertainty to the order of ten.

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A. B. Fedortsov (2016) Increasing the accuracy of the fast laser measurments transparent solid and liquid films thicknesses. Journal of Mining Institute. Vol 218. p. 306.