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Abstract

The aim of the article is a preliminary assessment of the possibility of using ATES (Aquifer Thermal Energy Storage) technology for the seasonal storage of heat and cold in shallow aquifers in Poland. The ATES technology is designed to provide low-temperature heat and cold to big-area consumers. A study by researchers from the Delft University of Technology in the Netherlands indicates very favorable hydrogeological and climate conditions in most of Poland for its successful development. To confirm this, the authors used public hydrogeological data, including information obtained from 1324 boreholes of the groundwater observation and research network and 172 information sheets of groundwater bodies (GWBs). Using requirements for ATES systems, well-described in the world literature, the selection of boreholes was carried out in the GIS environment, which allowed aquifers that meet the required criteria to be captured. The preliminary assessment indicates the possibility of the successful implementation of ATES technology in Poland, in particular in the northern and western parts of the country, including the cities of: Gdańsk, Warsaw, Wrocław, Bydgoszcz, Słupsk, and Stargard.

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Authors and Affiliations

Maciej Miecznik
Robert Skrzypczak
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Abstract

The article proposes a methodology for the formation of a combined model of the equilibrium values of pricing and the volume of electricity production, taking into account green and traditional sources of electricity production on the example of Ukraine. In accordance with the projected price and volume of electricity production in 2021, a model for redistributing electricity sources were considered, taking into account the minimization of budgetary resources and the risk of electricity production with appropriate restrictions in the production of various types of electricity and their impact on minimizing the price for the end user.
The studies have shown that important factors in the formation of electricity prices are indicators of the cost and volume of production, distribution and transportation of electricity to consumers, which largely depends on the formation and further development of the energy market in Ukraine. Also, the redistribution of the volumes of traditional and non-traditional electricity in the common “pot” is of great importance while minimizing risks and budgetary constraints. Balancing the system for generating electricity from various sources will help not only optimize long-term electricity prices and minimize tariffs for the end user, but also allow planning profit in the form of long-term market return on investment.
The analysis of the results showed that the optimal distribution of energy production makes it possible to obtain energy resources in the required volume with lower purchase costs and with minimal risk.
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Authors and Affiliations

Yuliia Halynska
1
ORCID: ORCID
Tetiana Bondar
2
ORCID: ORCID
Valerii Yatsenko
3
ORCID: ORCID
Viktor Oliinyk
3
ORCID: ORCID

  1. Department of International Economic Relations, Sumy State University, Ukraine
  2. Department of Management, Sumy State University, Ukraine
  3. Economic Cybernetics Department, Sumy State University, Ukraine
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Abstract

Promoted by many cities to meet the commute needs of their residents (for work, education, etc.), urban rail transport is a spatially expanding system. The safety of rail passengers and road users is one of the most important factors to consider when designing the infrastructure and assessing the operation of the urban tram system. One of the unsolved issues in the functioning of tram transport are sections of tramways with large longitudinal slopes. The article presents an attempt to use risk management for assessing the operational safety of tramways located on road sections with large longitudinal gradients. This particular problem occurs on a tram route in Gdansk. It runs along a street (partly on an overpass) with a gradient above 5% and a small horizontal curve. Risk was assessed using TRANS-RISK, a risk management method. In the first stage, a risk analysis was carried out using the Bow–Tie methods and error trees. The main risks of serious accidents on the analysed section of the tramway were identified. Three sub-concepts were used to assess risk: individual, societal and collective. Although not generally used for assessments of urban transport infrastructure, the latter was found most useful for assessing the safety of the analysed infrastructure. The results of the analyses and assessments helped to formulate design and maintenance principles for tram infrastructure located on sections with steep gradients.
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Bibliography

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Authors and Affiliations

Kazimierz Jamroz
1
ORCID: ORCID
Sławomir Grulkowski
1
Krystian Birr
1
ORCID: ORCID
Łukasz Jeliński
1
ORCID: ORCID
Marcin Budzyński
1
ORCID: ORCID

  1. Gdansk University of Technology, Faculty of Civil and Environmental Engineering, Narutowicza 11/12, 80-233 Gdansk, Poland
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Abstract

The paper presents the response of a three-layered annular plate with damaged laminated facings to the loads acting in their planes. The presented problem concerns the analysis of the combination of global plate failure in the form of buckling with the local micro defects, like fibre or matrix cracks, located in the laminas. The plate structure consists of thin laminated, fibre-reinforced composite facings and a thicker foam core. The matrix and fibre cracks of facings laminas can be transversally symmetrically or asymmetrically located in plate structure. Critical static and dynamic stability analyses were carried out solving the problem numerically and analytically. The numerical results show the static and dynamic stability state of the composite plate with different combinations of damages. The final results are compared with those for undamaged structure of the plate and treated as quasi-isotropic ones. The analysed problem makes it possible to evaluate the use of the non-ideal composite plate structure in practical applications.

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Bibliography

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Authors and Affiliations

Dorota Pawlus
1

  1. Faculty of Mechanical Engineering and Computer Science, University of Bielsko-Biala, Poland.
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Abstract

Palaeostresses inferred from brittle mesostructures in the southern Wright Peninsula show a stress field characterized by compressional, strike−slip and extensional regime stress states. The compressional stress ( s 1 ) shows a main NW−SE direction and the extensional stress ( s 3 ) shows a relative scattering with two main modes: NE−SW to E−W and NW−SE. The maximum horizontal stress ( s y ) has a bimodal distribution with NW−SE and NE−SW direction. The compressional orientation is related to subduction of the former Phoenix Plate under the Antarctic Plate from the Early Jurassic to the Early Miocene. Extensional structures within a broad−scale compressional stress field can be related to both the decrease in relative stress magnitudes from active margins to intraplate regions and stretching processes occurring in eastern Adelaide Island, which develop a fore−arc or intra−arc basin from the Early Miocene. Stress states with NW−SE−trending s 1 are compatible with the dominant pattern established for the western Antarctic Peninsula. NW−SE orientations of s 3 suggest the occurrence of tectonic forces coming from fore−arc extension along the western Antarctic Peninsula.
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Authors and Affiliations

Adolfo Maestro
Jerónimo López-Martínez

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