Wyniki wyszukiwania - Biblioteka Nauki

1

Corporate culture diagnostics in management control: Evidence from Ukraine

100%

Kuznetsova S. , Kuznetsov A.

Journal of Economics and Management

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2017

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tom 27

42-57

EN

The paper presents the model of corporate culture diagnostics for simulation in management control. Three approaches (symbolic, cognitive, and systematic) used for the diagnosis of corporate culture have been outlined. There have been provided 3 levels (basic underlying assumptions, espoused beliefs and values, and visual artifacts) to evaluate the state of corporate culture in a comprehensive way. Two methods of assessment (standard and dynamic) have been proposed for selection. 19 groups of indicators and 42 defined indicators that allow diagnosing corporate culture comprehensively have been provided. Based on the sample of 11 Ukrainian companies, the results suggest that application of the management control model provides a high quality informational base for decision-making on the trends and prospects of development, addressing problematic issues and weaknesses of the current corporate culture and use of its operating conditions and strengths to improve the overall efficiency of the company.

2

Increasing the economic efficiency of marine power plants using waste heat boilers with controlled flow separation

100%

Kuznetsov V. , Kuznetsova S.

Polish Maritime Research

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2024

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tom nr 3

94--101

EN

Heat recovery of exhaust gases from main and auxiliary marine diesel engines is an effective way to improve the technical and economic parameters of marine power plants. Improvements in engine efficiency necessitate an increase in the weight-size parameters of the waste heat boilers, which makes it difficult to recover heat. Intensification of the heat transfer process is considered to be an effective way to reduce these indicators. By utilising mathematical modelling, this paper shows the effectiveness of using profiled heating surfaces of waste heat boilers for this purpose. The use of elliptical heating surfaces with a mechanism of controlled flow separation, in the form of a triangular notch, is proposed. This will reduce surface drag and increase the overall thermal-hydraulic efficiency of the heat transfer processes. It is shown that the use of such surfaces in waste heat boilers makes it possible to increase the efficiency of marine power plants in tankers with a deadweight of about 45,500 tons up to 1.5% absolute and container ships with a deadweight of about 122,000 tons up to 2.5% absolute.

3

Determination of rational design values for gas-air coolers components of exhaust gases of marine power plants

80%

Kuznetsova S. , Kuznetsov V. , Voloshyn A.

Polish Maritime Research

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2023

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tom nr 3

81--88

EN

Modernisation of marine power plants in the transport vessel fleet to satisfy the requirements of the International Maritime Organization is an urgent scientific and technical problem. Currently, the use of catalytic selective filters, dry and wet scrubber systems and exhaust gas recirculation for marine diesel engines is widely used for this purpose. An analysis of the use of ejection gas-air coolers is presented as an additional method of emission reduction. However, the use of such device does not neutralise the harmful emissions of power plant engines, but only increases the volume concentration of their exhaust gases. But this will help to increase the efficiency of dispersion of harmful emissions, by reducing the concentration of harmful emissions to values not exceeding the maximum permissible concentrations. Its efficiency depends on the load mode of the diesel engine. It is found that the initial concentration of harmful substances in combustion products due to their dilution with fresh air at 100% engine load is reduced by about 50%. The values of the reduction of the concentration and temperature of exhaust gases with the reduction of the engine load to 75% and 50% depending on the louvre angle are obtained. It is proved that ejection gas-air coolers can be an effective additional means for compliance with modern environmental parameters, especially when vessels are in special areas of the world’s oceans.

4

Improvement of the cargo fleet vessels power plants ecological indexes by development of the exhaust gas systems

70%

Kuznetsov V. , Dymo B. , Kuznetsova S. , Bondarenko M. , Voloshyn A.

Polish Maritime Research

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2021

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tom nr 1

97--104

EN

Modernisation of the power plants of cargo fleet vessels to satisfy the requirements set out by the International Maritime Organisation is an urgent scientific and technical problem. The article presents the results of developing a solution to this problem that focuses on the exhaust gas system. We propose the use of ejection nozzles as part of this system. It was found that when the ejection coefficient in these nozzles is n = 3, it is possible to exclude the use of SCR reactors, thus reducing the operating costs of the marine power plant. Using a mathematical modelling method, the efficiency of operation of six types of nozzle as part of the exhaust gas system was investigated, and a constructive layout was proposed for the gas ducts and inlet louvres for supplying ambient air. To increase the efficiency of the proposed system, we consider several options for intensifying heat transfer processes through the use of dimple systems in the nozzles and nozzles with swirling flow. We found that these technical solutions would make it possible to further increase the efficiency of the systems by up to 19% abs.