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Date submitted2023-11-01
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Date accepted2024-05-02
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Date published2024-12-25
Improving the procedure for group expert assessment in the analysis of professional risks in fuel and energy companies
The lack of a unified approach to the assessment of professional risks in fuel and energy companies (FEC) in the national regulatory environment and a high degree of subjectivity of the results of hazard identification and risk assessment makes mathematically sound recruitment of an expert group urgent and necessary. The article presents the results of a comprehensive study on hazard identification and risk assessment at 6,105 workplaces in 24 branches of a FEC company based on the application of the expert assessment method and a scientifically sound qualitative and quantitative selection of experts. The priority vectors of factors are determined, global priorities are calculated, the size of the expert group (15 persons) is determined and mathematically substantiated for carrying out hazard identification and risk assessment at workplaces with sufficient reliability of results. For the first time, a set of factors characterizing the FEC companies that influence the determination of professional competence of experts is proposed. The formed expert group presented more precise, objective and consistent results of risk assessment. Standards for free distribution of personal protective equipment (PPE) and wash-off agents to 7,234 company employees for implementation and trial use were developed. A fragment of the results obtained for a driller's workplace is presented. This approach allows a significant increase in objectivity and efficiency of the professional risk management system and provision of the PPE to employees in the concept of a risk-oriented approach helping to prevent industrial injuries and improve the level of occupational safety culture in fuel and energy companies taking into account global practice.
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Date submitted2023-01-27
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Date accepted2023-03-04
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Date published2023-04-25
Use of the UNIFAC model in the calculation of physicochemical properties of ecotoxicants for technological and ecoanalytical purposes
- Authors:
- Vladimir G. Povarov
- Ignatyi I. Efimov
Modern development vector of environmental monitoring leads to elaboration of analytical methods for qualitative and quantitative analysis of different ecotoxicants. Many studies face the lack of information on isomers and homologues of already studied compounds. This problem cannot always be solved experimentally due to the difficulty of separating or synthesizing certain compounds; the use of group theories of solutions will help partly; using them, solubility in water or partition coefficient between two immiscible solvents is calculated for ecotoxicants. These parameters are important for solving the analytical and ecological problems. The partition coefficient in the octanol – water system is associated with a possibility of accumulation of different compounds in living organisms; the partition coefficient in the hexane – acetonitrile system can be used in gas chromatographic analysis. Solubility in water is closely associated with accumulation of ecotoxicants in water bodies, as well as with their ability to be transferred. This paper presents the capabilities of the UNIFAC model for solving physicochemical problems using the example of calculating the properties of real ecotoxicants on the basis of the available thermodynamic data. All the obtained calculated values were compared with those determined experimentally. In the case of pyrene derivatives, solubility data were obtained for the first time using a correlation group model to calculate the heat of fusion and melting temperature.
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Date submitted2022-06-20
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Date accepted2022-10-10
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Date published2022-11-03
Monitoring of grinding condition in drum mills based on resulting shaft torque
Grinding is the most energy-intensive process among all stages of raw material preparation and determines the course of subsequent ore beneficiation stages. Level of electricity consumption is determined in accordance with load characteristics forming as a result of ore destruction in the mill. Mill drum speed is one of process variables due to which it is possible to control ore destruction mechanisms when choosing speed operation mode of adjustable electric mill drive. This study on increasing energy efficiency due to using mill electric drive is based on integrated modelling of process equipment – grinding process and electromechanic equipment – electric drive of grinding process. Evaluating load torque by means of its decomposition into a spectrum, mill condition is identified by changing signs of frequency components of torque spectrum; and when studying electromagnetic torque of electric drive, grinding process is monitored. Evaluation and selection of efficient operation mode of electric drive is based on the obtained spectrum of electromagnetic torque. Research results showed that with increasing mill drum speed – increasing impact energy, load torque values are comparable for the assigned simulation parameters. From the spectra obtained, it is possible to identify mill load condition – speed and fill level. This approach allows evaluating the impact of changes in process variables of grinding process on parameters of electromechanical system. Changing speed operation mode will increase grinding productivity by reducing the time of ore grinding and will not lead to growth of energy consumption. Integration of digital models of the technological process and automated electric drive system allows forming the basis for developing integrated methods of monitoring and evaluation of energy efficiency of the entire technological chain of ore beneficiation.
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Date submitted2021-05-28
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Date accepted2021-11-30
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Date published2021-12-27
Features of grouping low-producing oil deposits in carbonate reservoirs for the rational use of resources within the Ural-Volga region
A methodology has been developed and a procedure for selecting homogeneous groups has been implemented using a set of parameters characterizing the properties of formation fluids, layering conditions, geological and physical properties of formations at different levels of the hierarchy. An algorithm for identifying deposits for monitoring and justifying measures to improve the efficiency of development management is proposed. A justification for the selection of associative groups of long-term developed objects using the parameters of geological heterogeneity according to different tectonic-stratigraphic elements is presented. To reduce the degree of uncertainty in the evaluation of objects by the degree and nature of geological heterogeneity, the parameters reflecting the degree of uncertainty of the system using complex characteristics are proposed. For different deposit associations, a different influence of the features of the object structure on the degree of their division has been established. In the process of deposit drilling, as additional information about development objects is obtained, it is necessary to specify the nature of the distinguished groups of objects first of all based on the use of characteristics of geological heterogeneity. Comparison of various grouping options shows the need to take into account the geological heterogeneity of objects during their drilling. The identification of groups of objects using a limited number of parameters is approximate, but at the stage of drafting the first design documents, it is possible to solve certain tasks aimed at determining the strategy for the development of deposits
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Date submitted2020-06-23
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Date accepted2021-03-02
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Date published2021-04-26
Automated digitization of radial charts
Radial charts were commonly used in the industry to allow retrospective assessment of technological parameters. Today it is relevant to digitize the obtained data in order to simplify the automation of technological processes. Digitization of radial charts by means of standard methods is carried out with the help of human labor at significant time costs. The article proposes an automated method for digitizing radial charts using software, developed in the LabVIEW programming environment. The results of processing radial charts are displayed on the screen in numerical and graphical form, and can also be exported to a file (for example, to Notepad or MS Excel). The presented technique can be applied to images obtained on a color or black-and-white scanner, which minimizes geometric distortions, associated with the conversion of a paper document into electronic form, and ensures recognition quality of the clear plot line with an average relative error of up to 3 %. In case of ink fading or perspective photos of the diagram, the value of relative error can reach 8 %, as a result of which additional manual correction of the data will be required.
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Date submitted2014-11-28
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Date accepted2015-01-13
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Date published2015-10-26
Nanobar code as multi-purpose two-dimensional notation with new features
- Authors:
- E. I. Pryakhin
The article gives an analysis of the current standard two-dimensional codes, showing their features and applications. It was concluded that the feasibility of developing a new type of two-dimensional codes, the Nanobar code (NBC), in which information can be open (available) and, if necessary, closed (unavailable) to the user through the use of cryptographic encryption techniques. At the same time the new codes provide a significant increase in the volume of coded information that allows us to recommend using them as a local database, in particular for the issue of electronic technological certificates and product passports, personal dog tags for the military, athletes and others. It is noted as an important characteristic that the Nanobar code is able to encode different types of digital information. Due to its characteristics, the NBC is proposed to use as an identification number and protect legal products against counterfeiting. Two variants of the NBC technology application are proposed – with laser printing and printer. For reading information from the NBC, special software was developed, including mobile applications that allow using a smartphone to read the NBC. The basic scope of the NBC application was suggested.
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Date submitted2013-07-02
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Date accepted2013-09-09
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Date published2014-03-17
Identification of degradation of soil and vegetable communities testing technogenic loading on materials of space shooting
- Authors:
- D. S. Korelskii
The basic principles on the use of satellite images of different resolution to assess the state of natural soil and plant communities with severe human impacts, primarily atmospheric. Researchers give now various signs of change of qualitative and quantitative structure of vegetation under technogenic loading. However all of them have essential shortcomings that demands continuation of researches in the field for the purpose of increase of reliability of allocation of zones of a breaking of plant communities in an operative mode.
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Date submitted2009-09-23
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Date accepted2009-11-23
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Date published2010-06-25
Experience of mediatext in social culture teaching creating
- Authors:
- I. V. Trofimova
This article is devoted a problem of creation of the mediatext as new format for presentation of the scientific information. On a material of culture of the 1930 which have marked transition from avant-garde to totalitarianism, the (video) picture reflecting leading tendencies of an epoch and the form of their artistic realisation is built.