scholarly journals Monitoring of Elastic Deformations of the Hydraulic Structure Gabcíkovo

2021 ◽  
Vol 906 (1) ◽  
pp. 012106
Author(s):  
Juraj Škvarka ◽  
Emilia Bednárová ◽  
Ivan Slávik ◽  
Monika Takácová
Keyword(s):  
Hydraulic Structure ◽  
Load Condition ◽  
Hydropower Plant ◽  
Measuring Instruments ◽  
Limit Values ◽  
Term Operation ◽  
Navigation Lock ◽  
The Right ◽  
The Impact

Abstract The settlement and its calculations and monitoring are among the main factors influencing the structure and operability of hydraulic structures. Our paper focuses on the hydraulic structure Gabcíkovo which consists of the hydropower plant with an installed capacity of 720 MW and two navigation locks to ensure international ship transportation. Conventional geodetic methods of classical or very precise leveling with state-of-the-art measuring instruments are currently used to monitor deformations on navigation locks of hydraulic structure Gabcíkovo. In their subsoil, there are gravelly sediments to a depth of about 400 m. Under the gravel sediments, there are Neogene clays and silts. From the beginning of construction, deformations are measured on all structures using special tachymetric devices to monitor the elastic displacements. The obtained measured values are then processed in time dependences and compared with the limit values. During the current almost 30-year operation of the navigation locks, filling and emptying cycles, loading and unloading of the subsoil can be counted in the tens of thousands. The impact of the long-term operation, but especially the current innovation and modernization of navigation locks, aimed at increasing the safety and intensity of transport brings new knowledge and experiences. During the implementation of required improvement related to this project, the right navigation lock is empty for more than a year. The created technical conditions made it possible to monitor the influence of long-term unloading on the subsoil on the vertical displacements in detail. This unusual load condition is a motivation to present the results of measurements in the presented paper.

scholarly journals The impact of information management in developing new products in bank – an empirical analysis

2021 ◽  
Vol 54 (3-4) ◽  
pp. 197-206
Author(s):  
Zoran Najdanović ◽  
Natalia Tutek
Keyword(s):  
Product Development ◽  
Information Management ◽  
New Product Development ◽  
New Products ◽  
New Product ◽  
Business Decisions ◽  
Customer Preferences ◽  
The Right ◽  
The Impact

Successful information management is big challenge for any organization. In this paper the emphasis is on information management in new product development in bank. Under strong pressure from competition and new technological changes, as well as the turbulent changes in the environment, financial institutions must continuously develop new products and services. In order to make the services more interesting to the users, it is necessary to collect data about the users, their wishes and preferences. The data should then be converted into useful information that will result with developing the right product or service that users will recognize as necessary. Products become personalized, user-friendly, and the emphasis is on the importance of long-term company relationships with customers. Only with well-organized information, managers can make the right business decisions and companies can react in time to market changes. When creating their strategy, successful companies analyze and identify elements that significantly contribute to creating a competitive advantage and ensuring long-term growth and development. The paper presents an empirical research of customer preferences which lead to new product development in bank.

Numerical Modelling of a District Scale Groundwater Heat Pump Operation: Case Study from Colchester, UK

2021 ◽  
Author(s):  
Taha Sezer ◽  
Abubakar Kawuwa Sani ◽  
Rao Martand Singh ◽  
David P. Boon
Keyword(s):  
Large Scale ◽  
District Level ◽  
Thermal Plume ◽  
Injection Wells ◽  
Term Operation ◽  
Heating And Cooling ◽  
Groundwater Heat Pump ◽  
The Impact

<p>Groundwater heat pumps (GWHP) are an environmentally friendly and highly efficient low carbon heating technology that can benefit from low-temperature groundwater sources lying in the shallow depths to provide heating and cooling to buildings. However, the utilisation of groundwater for heating and cooling, especially in large scale (district level), can create a thermal plume around injection wells. If a plume reaches the production well this may result in a decrease in the system performance or even failure in the long-term operation. This research aims to investigate the impact of GWHP usage in district-level heating by using a numerical approach and considering a GWHP system being constructed in Colchester, UK as a case study, which will be the largest GWHP system in the UK. Transient 3D simulations have been performed pre-construction to investigate the long-term effect of injecting water at 5°C, into a chalk bedrock aquifer. Modelling suggests a thermal plume develops but does not reach the production wells after 10 years of operation. The model result can be attributed to the low hydraulic gradient, assumed lack of interconnecting fractures, and large (>500m) spacing between the production and injection wells. Model validation may be possible after a period operational monitoring.</p>

scholarly journals The impact of environmental conditions on water salinity in the area of the city of Inowrocław (north-central Poland)

2017 ◽  
Vol 13 (1) ◽  
pp. 5-15 ◽  
Author(s):  
Piotr Hulisz ◽  
Arkadiusz Krawiec ◽  
Sylwia Pindral ◽  
Łukasz Mendyk ◽  
Kamila Pawlikowska
Keyword(s):  
Surface Water ◽  
Groundwater Resources ◽  
Geological Structure ◽  
Anthropogenic Factors ◽  
Limit Values ◽  
Surface Water And Groundwater ◽  
Zechstein Salt ◽  
The Impact ◽  
The City

AbstractThe article presents the influence of natural and anthropogenic factors on the chemical and physical properties of surface water and groundwater in the area of the city of Inowrocław. It has been shown that the properties of the waters were most strongly affected by the specific geological structure (the city is located within the Zechstein salt dome) as well as the long-term influence of a salt mine and soda plant. The composition of most analysed samples was dominated by Ca2+, Na+and Cl−ions. In places of heavy industrial activity, some water parameters were several time higher than permissible limit values according to Polish standards. It is concluded that, due to the threat to the city’s drinking groundwater resources and fertile soils, the surface water and groundwater in the area in question require permanent monitoring.

scholarly journals The Impact of Investment Decision and Funding on Financial Performance and Firm Value

2019 ◽  
Vol 8 (2) ◽  
pp. 103
Author(s):  
Hadi Santoso
Keyword(s):  
Data Analysis ◽  
Financial Performance ◽  
Firm Value ◽  
Stock Exchange ◽  
Investment Decision ◽  
Investment Decisions ◽  
The Right ◽  
The Impact ◽  
Selection Of

Managers who are responsible for the management of companies are faced with two important decisions - investment and funding. The right investment decisions and choice of funding sources are important because they affect the company's financial performance. The selection of the types of assets to be invested and the right types of financing sources result in optimal returns for the company. It reflects good company performance and future prospects. In addition, optimal return is a good sign for investors. Companies that perform well experience increase in the value of their firm. This study examined the effect of investment decisions and the selection of appropriate sources of funds on the performance of the company and the consequent impact on the firm value. The study was conducted in two parts. The first part examined the effect of investment decisions on long-term assets with long-term funding on the rate of return and firm value. The second part examined the effect of investment decisions on the company's short-term assets and funding for financial performance and firm value. The case study used in this research is a consumer goods sub-sector company listed on the Indonesia Stock Exchange in the period 2010 to 2017. Path analysis is the data analysis tools that was used. The results of data analysis showed that the asset structure has an effect on financial performance and firm value. The capital structure affects the financial performance but does not affect the firm value of the company. Financial performance was measured by ROI.

scholarly journals Improving the reliability of cable lines operation in hot climates

2020 ◽  
Vol 216 ◽  
pp. 01151
Author(s):  
Daniyar Bakhtiyarovich Madrakhimov ◽  
Vera Pavlovna Ivanova ◽  
Victoria Vyacheslavovna Tsypkina
Keyword(s):  
Solar Radiation ◽  
Climatic Factors ◽  
Climate Conditions ◽  
Term Operation ◽  
Asian Region ◽  
Hot Climate ◽  
Central Asian ◽  
Cable Lines ◽  
The Impact

Reliability of cable lines in hot climate is determined by the climatic characteristics of cables and wires, which include: long-term and short-term heat resistance, cold resistance, moisture resistance, resistance to cyclic exposure to temperatures and solar radiation, ozone resistance, etc. This article considers the main impacts of environmental factors: high temperatures, solar radiation, which, as practice shows, lead to irreversible deterioration of the electrical and mechanical properties of cable products. The result of climatic impacts in the Central Asian region, in hot climate conditions, is the aging of both insulation and protective coverings, which leads to irreversible change in the mechanical and electrical properties of the used polymers due to the loss of elasticity of the extruded material and its subsequent cracking, turning into cracks. The assessment of the possibility of long-term operation of the used polymer was carried out according to the polyethylene oxidation period, which determines the time of natural preservation of various types of cables during the period of their operation. The research was carried out on samples of cables stored under a canopy in wooden boxes, protected from sunlight and precipitation, by measuring criterion parameters with strict compliance with the established norms. Thus, the proposed solution for increasing the reliability of cable lines consists of debugging the technological process of applying insulation and sheathing, in which the extrusion of the polymer mass is carried out by technique that minimizes the ingress of contamination. Review of the results showed that extrusion line improvement would provide possibility of increasing reliability in the operation of cable products under the impact of climatic factors of the Central Asian region due to the reduced aging of insulation.

scholarly journals Lefebvre’s thought in contemporary urban sociology

Sociologija ◽  
2013 ◽  
Vol 55 (3) ◽  
pp. 475-491
Author(s):  
Miloje Grbin
Keyword(s):  
Urban Sociology ◽  
Right To The City ◽  
Henri Lefebvre ◽  
Production Of Space ◽  
Theoretical Assumptions ◽  
The Right ◽  
Space Production ◽  
The Impact ◽  
The City

This paper presents the impact of Henri Lefebvre?s thought in contemporary urban sociology. In the first chapter, the reader can find brief descriptions of two most relevant Lefebvre?s concepts linked to his comprehension of space: production of space, the right to the city and a couple of firmly related concepts. The second chapter presents several examples of their recent interpretations by the authors from different theoretical backgrounds. Simultaneously, it evaluates the relevance of Lefebvre?s theoretical assumptions in contemporary social context, as well as their theoretical and methodological relevance for further research and development of urban sociology. Conclusion emphasizes that Lefebvre?s ideas have a deep and long term influence in urban sociology.

scholarly journals Optimization Model for the Long-Term Operation of an Interprovincial Hydropower Plant Incorporating Peak Shaving Demands

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4804
Author(s):  
Rui Cao ◽  
Jianjian Shen ◽  
Chuntian Cheng ◽  
Jian Wang
Keyword(s):  
Power Generation ◽  
Optimization Model ◽  
Hydropower Plant ◽  
Mixed Integer ◽  
Short Term ◽  
Long Distance ◽  
Peak Shaving ◽  
Term Operation ◽  
Proposed Model

The increasing peak-to-valley load difference in China pose a challenge to long-distance and large-capacity hydropower transmission via high-voltage direct current (HVDC) lines. Considering the peak shaving demands of load centers, an optimization model that maximizes the expected power generation revenue is proposed here for the long-term operation of an interprovincial hydropower plant. A simulation-based method was utilized to explore the relationships between long-term power generation and short-term peak shaving revenue in the model. This method generated representative daily load scenarios via cluster analysis and approximated the real-time electricity price of each load profile with the time-of-use price strategy. A mixed-integer linear programming model with HVDC transmission constraints was then established to obtain moving average (MA) price curves that bridged two time-coupled operations. The MA price curves were finally incorporated into the long-term optimization model to determine monthly generation schedules, and the inflow uncertainty was addressed by discretized inflow scenarios. The proposed model was evaluated based on the operation of the Xiluodu hydropower system in China during the drawdown season. The results revealed a trade-off between long-term energy production and short-term peak shaving revenue, and they demonstrated the revenue potential of interprovincial hydropower transmission while meeting peak shaving demands. A comparison with other long-term optimization methods demonstrated the effectiveness and reliability of the proposed model in maximizing power generation revenue.

scholarly journals A varying comprehensive hydropower coefficient for medium/long-term operation of a single reservoir

2020 ◽  
Vol 51 (4) ◽  
pp. 686-698
Author(s):  
Wenting Gong ◽  
Pan Liu ◽  
Lei Cheng ◽  
He Li ◽  
Zhikai Yang
Keyword(s):  
Big Data ◽  
Hydropower Plant ◽  
Simulation Accuracy ◽  
K Value ◽  
Term Operation ◽  
Water Power ◽  
Hydropower Plants ◽  
Water Head ◽  
Study Results

Abstract In medium/long-term reservoir operation, the hydropower output is calculated from k × q × h, where q is the power discharge, h is the water head, and k is the comprehensive hydropower coefficient. k indicates the conversion efficiency from water power to electricity, however, it is standard practice to use a constant k. We developed a novel method to derive the varying k based on observed big data. The operational frequencies of different units for time (multiple periods) and space (multiple units) were accounted based on the observed big data from each unit, and then weights were obtained. Finally, k was derived by integrating the efficiency curves (hill charts) of the different units with their weights. The Three Gorges Project, China, was selected for a case study. Results indicated that: (1) the varying k value can improve hydropower simulation accuracy, (2) simulations using 10-day intervals have a higher accuracy for hydropower calculation than daily and monthly scales, (3) the evaluation of hydropower plant benefits is sensitive to k, and there is potential for producing more hydropower. These findings are highly relevant to the operation of hydropower plants and to the evaluation of medium/long-term hydropower generation for a hydropower plant.

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