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1

Implementation of the Models of Operational Research for the Solution of the CNC Machines Life Cycle

Šaffová Damiána, Petráš Dávid, Mykhei Maksym

Management Systems in Production Engineering

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2025

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nr 2 (33)

289--297

EN

Operational research is a significant part of management, based on improving efficiency, operability, and machine quality. Those improvements influence the time of the repair process, workforce availability for the repair process, safety, and environment. The main goal of this article is to investigate the optimal – operating service life of the machine and the optimal – operating time interval for the renewal of the CNC metalworking machine. The research was implemented in a small enterprise in Slovakia that needed a CNC machine in the production process. The research hypothesis was determined H1: Using quantitative models of operational research can manage the machine’s life cycle. We used quantitative mathematical models of operational research. By calculation, we found that the optimal – operational lifetime of the CNC machine is 6 years. The renewal time of the machine is between the 5th and 6th year of use with a minimal level of the total costs for repairs and maintenance. This simulation is essential information for the financial plan for CNC machine renewal. The results of the research showed a confirmed hypothesis. The suggested proactive model is a viable instrument for the machine park in small enterprises with various orientations.

2

Improving Tire Lifespan Using the Six Sigma Approach: A Case Study in a Coal-Hauling Company

Hia Selamat W., Laksono Singgih Moses

Management and Production Engineering Review

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2025

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Vol. 16, No. 1

1--7

EN

In the mining industry, the use and maintenance of equipment are associated with significant operational costs. One of the issues in this case is tire wear, as tires account for a major part of the operating costs of rubber-tired equipment. This paper aims to improve the tire life span of hauling dump truck tires using the Six Sigma approach. The case study was conducted at a medium-sized coal-hauling contractor company. The root causes were identified through a cause-effect diagram, which improved operations by increasing tire life by 27% from 56.065 kilometers to 73.093 kilometers.

3

The Role of Intellectual Capital in the ESG Strategies of Modern Companies

Podobińska-Staniec Marta

Inżynieria Mineralna

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2025

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Vol. 1, no. 1

291--296

EN

Non-financial reporting, conducted by companies for many years, has now been aligned with the ESG principles (Environmental, Social, Governance). The question of whether ESG reporting considers the intellectual capital of enterprises, which includes knowledge resources, competencies, relationships, and information about patents and innovation, is raised. Although it may seem intuitive that it should, the reality might be more complex. The author of this study attempted to explore this connection by formulating two main research questions: whether there is a relationship between the information contained in ESG reports and intellectual capital, and whether strategies for managing intellectual capital can provide stakeholders with relevant information about the long-term condition of the company. In the past, stock market indices promoting good practices and sustainable development played a role in assessing such issues; however, currently, the obligation to report on ESG aspects may serve as a foundation for better protection and management of most intangible assets held by organizations.

PL

Raportowanie niefinansowe, realizowane przez przedsiębiorstwa od wielu lat, obecnie zostało podporządkowane zasadom ESG (Environmental, Social, Governance). W związku z tym pojawia się pytanie, czy raportowanie ESG uwzględnia kapitał intelektualny przedsiębiorstw, czyli zasoby wiedzy, kompetencji, relacji, a także informacje dotyczące patentów i innowacyjności. Choć intuicyjnie wydaje się, że tak powinno być, rzeczywistość może być bardziej złożona. Autor niniejszego opracowania podjął próbę zbadania tego powiązania, formułując dwa główne pytania badawcze: czy istnieje zależność między informacjami zawartymi w raportach ESG a kapitałem intelektualnym oraz czy strategie zarządzania kapitałem intelektualnym mogą dostarczyć interesariuszom istotnych informacji na temat długofalowej kondycji przedsiębiorstwa. W przeszłości rolę w ocenie takich aspektów pełniły indeksy giełdowe promujące dobre praktyki i zrównoważony rozwój, jednak obecnie to właśnie obowiązek raportowania aspektów ESG może stanowić fundament do lepszej ochrony i zarządzania większością aktywów niematerialnych, jakimi dysponują organizacje.

4

Upgrading the production process and improving the quality of linear double-row cages through value stream maping

Paruzel Weronika, Zwierzchowski Maciej

Advances in Science and Technology. Research Journal

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2025

|

Vol. 19, no. 3

252--261

EN

In an era of intense competition in the market, manufacturing companies confront the challenges of optimizing production processes and improving the quality of the products they offer. In this context, instruments such as Value Stream Mapping (VSM), a logical map and a technological approach to the process become invaluable. The purpose of this article is to present a methodology for their application in the process of optimizing production time and improving product quality, as well as the results of a study conducted at a manufacturing company engaged in the production of linear technology solutions.

5

Use of the importance-performance analysis method in customer satisfaction surveys for entertainment services – case study

Jagusiak-Kocik Marta

Zeszyty Naukowe Politechniki Morskiej w Szczecinie

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2024

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nr 79 (151)

49--55

EN

The aim of this work is to assess the possibility of using the IPA method to examine the quality of entertainment services. The increasingly popular children’s playrooms are chosen as the service. A survey was conducted among parents visiting playrooms with their children, which included, in addition to a short description, a Question regarding the assessment of 12 attributes that may affect the level of satisfaction with the selected service. Respondents were asked to rate these attributes on a scale from 1 to 5 in terms of two criteria. The first one is the importance of a given attribute; the second criterion concerns the assessment of the degree of performance of a given attribute. These activities made it possible to divide the attributes into a matrix, which distinguishes important and well-rated attributes, important but worse-rated attributes, less important and poorly rated attributes, and less important and well-rated attributes. Thanks to the IPA method, information is obtained about what is important to the respondents within entertainment facilities such as children’s playrooms and to what extent it meets their expectations, and the matrix form enables the identification of those attributes that require improvement. The obtained results may be useful in improving such facilities and enhancing their safety.

6

Why organizations do not use the information obtained during auditing for improvement – identifying the reasons

Ligarski Mariusz

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2024

|

z. 194

245--258

EN

Purpose: The aim of the article is to examine the reasons why organizations do not use the information obtained in the audit process. Design/methodology/approach: For the realization of the work we used the results of our own research of organizations that have certified quality management systems for compliance with the requirements of ISO 9001. The information obtained relates to organizations operating in the territory of Poland. Findings: Organizations conducting quality management system audits acquire a variety of information that should be used for management purposes. Some organizations have serious problems with acquiring data and processing it, and using the information for decision-making and improvement-oriented activities. The paper identifies 10 potential reasons why organizations do not use information from the audit process. A comparison was made between the causes found in internal and external audits. An analysis of each of the identified causes was carried out, paying attention to their origins. Attention was paid to the connections between the causes. Directions for eliminating problems were indicated. Practical implications: The results obtained have practical application. Organizations with an awareness of the causes of problems are able to take, both corrective action and preventive action. In the first case, it is about taking corrective actions to existing problems. In the second case, it is about preventive actions, which should prevent a problem from arising. Social implications: The results obtained have social implications. They draw attention to the need to build a pro-quality and improvement-oriented awareness. Originality/value: The article for the first time identifies the causes of problems arising in organizations in the context of the use of audit information. Attention is paid to the mechanism of disorders and ways to eliminate them are indicated. The article is especially recommended to the top management of organizations that conduct system audits.

7

Using the theory of constraints thinking process tools to solve critical problems in the organization

Knop Krzysztof

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2024

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z. 197

305--331

EN

Purpose: The article aims to practically use the tools of the Theory of Constraints thinking process to eliminate critical problems in a selected subsystem of an enterprise in the automotive industry and, based on practical experience, to determine the strengths and weaknesses resulting from their use as well as external opportunities and threats, to indicate appropriate remedial actions that will enable managers of any organization to use thinking tools effectively. Design/methodology/approach: The goals of the article were achieved through the practical application of selected thinking process tools from the Theory of Constraints to solve critical problems in the R&D department of the selected company from the automotive industry. Identifying the goals of the subsystem of the studied company, identifying key problems, solving an important conflict in the subsystem, determining ways to solve key problems, and practically applying one of the solutions using the whole TOC toolkits constituted the scope of the research. The research tools were the TOC thinking process tools, such as the Goal Tree, the Current Reality Tree, the Evaporating Cloud, the Future Reality Tree, the Prerequisite Tree, and the Transition Tree. An active SWOT analysis was used to indicate the strengths and weaknesses of thinking tools, based on the experience gained, and external opportunities and threats related to their use were identified. The research methodology was based on the use of qualitative analysis to develop thinking process tools through interviews and brainstorming with the key stakeholders of the studied organizational subsystem, interested in achieving specific goals for the analyzed subsystem and assessing the practical application of the thinking process tools. Findings: It has been proven that the use of the Theory of Constraints thought process tools allows you to effectively solve critical problems in the subsystem of an automotive company. Using the tools of the thought process, key problems were identified in the analyzed organizational subsystem and actions were proposed to eliminate them. It will also identify the strengths and weaknesses of these improvement tools, as well as the opportunities and threats associated with their use by the organization. Research findings indicate that TOC thinking process tools enable a systematic approach to solving complex problems. Thanks to these tools, the analyzed company can combat internal constraints that limit its effectiveness, efficiency and competitiveness on the market. The condition for the effective use of thinking process tools is support from management, employees' knowledge of how to use them, using individual tools at a given time, the most important ones in the context of problem-solving, and effectively struggling with the weaknesses of these tools. Research limitations/implications: The study concerned a single company from the automotive industry, which makes it impossible to generalize the results to the entire industry. The qualitative nature of the research methodology introduces subjectivity into the analysis. Future research will focus on conducting comparative studies to evaluate the effectiveness of thinking process tools in identifying the root cause of complex problems compared to other methods used to solve problems. Practical implications: The research results indicate the effectiveness of the Theory of Constraints thinking process tools in solving critical problems. Other organizations can use this approach to streamline their processes, eliminate difficult systemic constraints, and more effectively achieve business goals. Thanks to thinking tools, companies can identify the root causes of their problems and indicate ways to solve them. By involving managers and employees from the organization interested in achieving the established goals in the process of creating thinking process tools and using their knowledge and experience, it is easier to properly identify the root causes of critical problems and then implement appropriate remedial actions. The SWOT analysis, based on the research and experience obtained, establishes the conditions for the effective use of TOC thinking process tools by other enterprises. Originality/value: The article has cognitive and practical values. The research results can serve as a reference point, and benchmark for managers of various organizations in terms of the approach to eliminating critical problems in the organization and how to effectively use TOC thought process tools by empowering their strengths, eliminating their weaknesses, taking advantage of opportunities, and counteracting threats.

8

Selected instruments for improving university management

Jakubiec Marcin

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2024

|

z. 195

219--230

EN

Purpose: The aim of the article is a theoretical and cognitive characterization of selected instruments for improving university management (such as concepts, systems and methods in the area of quality management), and then analyzing their knowledge and use on the example of the University of Bielsko-Biala. Design/methodology/approach: The article is a theoretical and analytical study in the field of selected instruments for improving university management, based on a case study of the University of Bielsko-Biala. The analytical part of the article was carried out in the last quarter of 2023 and included the university's rector and other management staff. Findings: The case study allowed to indicate which instruments for improving university management are known and used at the analyzed university. The presentation of some of the instruments was supported by practical examples of their use, in particular in the area of value stream mapping. Research limitations/implications: Limitations in the implementation of the case study in the field of university management improvement instruments should be related to the instruments included in the analysis. Such action is usually subjective and the researcher is not always able to comprehensively address the issue at hand, taking into account the methodological and substantive aspects. Practical implications: Through a case analysis, it was indicated which instruments for improving university management are known and used at the studied university. Such an analysis may be a contribution to further research and discussion on management improvement instruments that can be used by universities. Originality/value: The added value of the article is the case analysis, which allowed for the identification of selected improvement instruments that can be used in university management.

9

Implementation of Industry 4.0 elements and their impact on the enterprise productivity

Żarski Wojciech, Lamparski Wojciech

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2024

|

z. 194

701--710

EN

Purpose: The main incentive for choosing the topic of the study is related to the need to look for solutions to fundamental problems related to the activities of manufacturing enterprises that must meet the requirements of market competition by achieving competitive advantages and increasing productivity. The subject of the study are advanced manufacturing technologies, characterized by a high level of innovation and automation, and their impact on the productivity of a manufacturing company. The aim of the study is to assess the impact advanced manufacturing technologies on the productivity and production quality on the example of a company producing parts and components for rail vehicles. Design/methodology/approach: the study analyzed the literature on productivity and calculated productivity indicators based on the company's financial data. Moreover, the participant observation method was used to assess the reorganization of the production process, and a survey was conducted for company employees to determine the validity of the implemented technological investments. The case study concerns a company producing parts and components for rail vehicles. Findings: The level of approval of investments in advanced manufacturing technologies and their impact on the quality and efficiency of the manufacturing process of was determined. The implementation of advanced manufacturing technologies allowed the company to: shortened the manufacturing process by approximately 40%, the number of procedures was reduced from nine to five, and the number of employees participating in it was reduced from ten to five. Originality/value: assessment of the effects of the use of advanced technologies, the study is addressed to the management of manufacturing enterprises.

10

Application of selected methods in process improvement

Lestyánszka Škůrková Katarína, Prajová Vanessa, Praj Filip

System Safety : Human - Technical Facility - Environment

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2024

|

Vol. 6, iss. 1

459--472

EN

As customer needs and expectations change, and as competitive pressures and technological advances increase, organisations are forced to continuously improve their products and processes. The use of quality management methods and tools stimulates organisations to analyse customer requirements, to define the processes that contribute to the creation of a customer-acceptable product, and to keep these processes under control. The present paper deals with improving the manufacturing process of conveyor sorting belts, specifically the problem of opening joints on CSC belts. By forming a team and their joint efforts, the root causes of the problem in the CSC belt manufacturing process were identified using the Ishikawa diagram and action plan, and several corrective measures were proposed. The root causes that were likely related to the occurrence of the joint opening problem on the CSC belts prior to its detection include: hiring new staff for the LBWC department, purchasing four new Fonmar ALFA heat presses, rebuilding the Rodder & Piller die-cutting equipment, changing the way the belt joints are cut, implementing an unwinding system on the Rodder & Piller equipment, and changing the pressing parameters. Among the deficiencies found in connection with the monitored process are: uneven shape of the cut teeth, life of the strips - dynamic tests, presence of polyurethane in the joint. Corrective measures taken include: use of modular roller belt, inspection of joints using work lights. These corrective measures have also been implemented, with verification validating these measures.

11

Investigation of the accuracy of BeiDou, QZSS and QZSS/BeiDou satellites configuration for short, medium and long baselines in the Asia-Pacific regions

Pirti Atinc

Reports on Geodesy and Geoinformatics

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2024

|

Vol. 118

17--21

EN

The field of satellite navigation has seen significant advancements due to the fast development of multi-constellation Global Navigation Satellite Systems (GNSS). Around 150 satellites will be in service when all six systems – GPS, GLONASS, Galileo, BeiDou, QZSS, and NAVIC – are launched by 2030, offering both enormous potential and advantages for research and engineering applications. This study used an experiment on the accuracy, particularly for short, medium, long baselines (Wide Lane ambiguity solution) of the BeiDou, QZSS and QZSS/BeiDou combinations. It showed that with the integration of BeiDou/QZSS static measurements in the study region millimetre-centimetre accuracy for short, medium, and long baselines can be attained. Based on the results of this study, it can be concluded that the 1st (QZSS/BeiDou), 2nd (BeiDou), and 3rd (QZSS) strategies feature different horizontal accuracies for all categories. The obtained results with different satellite configurations for the Fixed-Wide-Lane integer ambiguity solution are compared with each other. Accuracy at the short baseline (BeiDou, QZSS, and BeiDou/QZSS satellites) was obtained in the range of 0.5–0.7 cm. For the medium baseline, it was computed around 1.8–82 cm. For the long baseline, the accuracy was 5.6–13.3 cm.

12

Quality by design. Założenia, wymagania i efekty

Zych Wiktoria

Kierunek Farmacja

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2024

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nr 2

20--22

PL

Wdrożenie metodologii Quality by Design (QbD) przynosi wiele korzyści. To przede wszystkim usprawnienie procesów produkcyjnych, możliwość wdrożenia środków kontroli jakości w czasie rzeczywistym, ograniczenie liczby odchyleń oraz podejmowanie decyzji regulacyjnych w oparciu o określone wcześniej ryzyko.

13

Ciągłe doskonalenie. Projekt czy kultura?

Rostankowski Rafał

Kierunek Farmacja

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2024

|

nr 4

44--46

PL

Rozwój organizacji zależy od opracowania i wdrożenia odpowiedniej strategii. Aby skutecznie realizować jej wytyczne, niezbędne są efektywne procesy. Jednak strategiczne plany często zawodzą, a ich wykonanie nie odbywa się zgodnie z wcześniej przyjętymi założeniami.

14

Implementation of Active Learning in BPM Education

Grzesiak Marzena

Decision Making in Manufacturing and Services

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2024

|

Special Issue: Business Process Management

117--125

EN

The challenges that are faced by BPM educators are not only related to the evolution of the BPM concept and technological trends but also to the changing expectations and attitudes of students as well as the requirements of the labor market. Active learning promotes the better memorization and understanding of even tricky issues. Active-learning methods are increasingly being implemented, and their effectiveness is being studied in numerous scientific studies. Many studies have confirmed that better learning outcomes are achieved through active learning. Implementing flipped learning in a previous academic year and supplementing it with other active methods in the following year allowed for course improvements; students showed more outstanding commitment and satisfaction with the classes. The introduction of changes to the Business Process Modeling and Process Management courses was dictated by, among other things, the desire to adapt to the postulates that have been developed in the BPM educator community regarding the scope of the knowledge and the skills that were transferred within the courses. The changes concerned both lectures (reviews and updates of content, abandonments of the form of administration) and the laboratory (changes of program, preparations for certification). The conclusions from the observations of the pilot implementation of the changes in the courses constituted the basis for refining the materials and methods in the next academic year.

15

Stabilization of operational processes through the application of the SDCA and the DACI matrix

Leby Christ Lekuma

Archives of Engineering Knowledge

|

2024

|

T. 10, Nr 1

137--141

EN

This article presents how the combined use of the SDCA cycle and the DACI matrix improves process management in the production and administration areas. The first part provides a theoretical analysis of the SDCA-DACI method. Then, it discusses its practical application in production and administrative services. It also presents a case study of the implementation of this method in a manufacturing company, where the results before and after the implementation of SDCA-DACI over a period of six months are compared. The analysis shows a 20% reduction in the relative defect rate (from 5% to 4%) and a reduction in the average approval time from 10 to 7 days, which corresponds to a 30% improvement in the efficiency of decision-making processes. The results of the study prove that the integration of SDCA-DACI is an effective tool for stabilizing and optimizing organizational processes. This approach promotes better assignment of responsibilities, reduction of errors and improvement of internal communication. In addition, the possibility of broad application of this method in various sectors is emphasized, which makes it a universal tool supporting effective management and continuous organizational improvement.

16

Statistical multivariate analysis of the dosing process results for predictive production and quality management – a case study from the food industry

Knop Krzysztof

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2023

|

z. 176

277--292

EN

Purpose: The aim of this article is to perform a multivariate statistical analysis of package filling process results for predictive production and quality management. The article presents a case study from the food industry that demonstrates the feasibility of using an appropriate set of control charts for ongoing and predictive production and quality management. Design/methodology/approach: The objectives of the article were achieved through the use of Statistical Process Control (SPC) tools, in particular control charts. The control charts used include both traditional numerical chart such as Xbar and S and special charts such as MA, EWMA, CUSUM and GCC. Findings: SPC tools such as control charts have proven to be extremely useful in monitoring the filling process and predicting future performance. By carefully monitoring the process using traditional and special control charts, it is possible to quickly identify small, gradual or sudden changes that may occur in the production process before the process gets out of control. Research limitations/implications: The research will continue by identifying additional factors that affect the quality of the product, particularly as regards precision and accuracy of dosing, and by evaluating the process studied in terms of its ability to meet customer requirements. Other statistical techniques will also be used to identify patterns and relationships between the various parameters of the process under study. This approach will provide more comprehensive information about the quality and ability of the dosing process to meet customer requirements.. Practical implications: By implementing the right SPC toolkit and using dedicated software that significantly speeds up data analysis, companies can effectively control the quality of the production process. By monitoring the behaviour of the process over time and detecting small changes and trends, it is possible to respond to potential problems in advance. Originality/value: This article is intended for production process managers who want to learn how to use the right SPC toolkit to obtain information about the process behaviour and the moments when intervention actions should be taken.

17

Selected issues of using Lean Management in university management

Jakubiec Marcin

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2023

|

z. 175

179--192

EN

Purpose: The aim of the article is to present an analysis of selected elements of Lean Management - barriers in management systems and methods of improvement on the example of public universities in Poland. Design/methodology/approach: The article is a theoretical and empirical study presenting selected results and an analysis of the survey results. The study was conducted on a group of 58 public universities in Poland in 2021-2022. Findings: The analysis of the research results presents the characteristics of selected barriers in the management systems of the analyzed universities. The answer to the existing barriers is the presentation of selected methods of improvement undertaken by the managers of the surveyed universities in order to minimize or eliminate them. Research limitations/implications: The limitations relate to the conducted study and result from the selection of selected barriers in university management systems for the study and the ways of improving these systems. Therefore, some of the barriers or ways of improvement may have been omitted, which will be taken into account in subsequent research and articles. Practical implications: The results of the study show the barriers in management systems in the surveyed universities, which are often a source of waste and other problems. As part of the study results, university managers indicated which improvement methods they take to counteract the existing barriers. Originality/value: The added value of the article is a study conducted on a group of public academic universities in Poland in the field of implementation of selected elements of Lean Management.

18

Evaluation of quality policy of selected companies in the context of quality management independence

Molenda Michał

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2023

|

z. 175

357--368

EN

Purpose: The primary purpose of the article is to present a study whose subject was the assessment of the quality policies implementation in selected enterprises. Design/methodology/approach: The deliberations are based on the related subject literature and an analysis of the long-term survey results. The practical results of the research described in this article are based on a survey of supervisory employees and middle managers, who represented the enterprise by filling out a single survey sheet. The survey was conducted in 2015-2022 among 240. enterprises operating in Poland. During the survey, independence in setting quality policy was identified for 237. enterprises. These were manufacturing and service enterprises from various industries. Enterprises were selected on the basis of proposals issued to conduct a survey. The surveyed group does not have the character of a research sample. When analyzing the survey results, no parameter estimation was made on the population of Polish enterprises. The quality policy survey sheet described 35. aspects (behaviors) characteristic of a strongly quality-oriented organization, close to the TQM philosophy (The article contains results for only 10 aspects). Respondents indicated how the behavior described in the survey is characteristic of the organization where they work. The described aspects were rated by respondents on a scale of 1 to 5. The scale adopted reflects the strength of the similarity of the behavior described in the survey to the situation in each organization. Findings: In close to every studied Quality Policy aspects, higher score was received by companies where the standards are imposed by foreign management boards. This is connected obviously not just with standards but also with the governance. The reasons for this should become a subject of further analyses. A certain potential can be observed for national companies relating to the foreign good practice implementation. Originality/value: Knowledge of quality management issues has been increased. The article raises the issue of implementing quality policies in companies. The quality policy was characterized by selected aspects. An evaluation of these aspects in selected enterprises was carried out, and differences dividing quality policies among independent and dependent enterprises in the implementation and supervision of quality standards were identified.

19

Ocena przekształceń piętrowego, ceglanego domu z dachem półpłaskim z przełomu XIX-XX pod wpływem termomodernizacji na przykładzie gminy Puck, woj. pomorskie

Szarejko Magdalena, Górka Anna

Wiadomości Konserwatorskie

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2023

|

Nr 73

102--116

PL

Ceglane budynki mieszkalne z przełomu XIX i XX wieku, które stanowiły charakterystyczny element krajobrazu wsi pomorskiej, obecnie powszechnie poddawane są modernizacji w celu poprawy warunków cieplnych. Przedmiotem badania jest stan zachowania najmłodszego, historycznego typu domu w zagrodzie chłopskiej na Kaszubach – piętrowego, ceglanego domu z dachem półpłaskim. Badanie przeprowadzono na obszarze gminy Puck. Zidentyfikowano i opisano 42 obiekty w 16 miejscowościach. Ponadto zaproponowano metodę klasyfikacji i oceny zmian architektonicznych pod wpływem termomodernizacji. Rezultaty potwierdziły znaczną skalę przekształceń: zaledwie dwa obiekty zachowały się bez zmian, podczas gdy 67% jest częściowo lub znacznie przekształconych. Uzyskane wyniki dowodzą trwałości wiejskich, historycznych budynków ceglanych oraz potrzeby poszukiwania i popularyzacji rozwiązań termomodernizacyjnych spełniających warunki ich ochrony.

EN

Brick houses dating back to the turn of the nineteenth and the twentieth centuries, which were a distinctive component of the Pomeranian countryside’s landscape, are now commonly being transformed to improve their thermal conditions. This study analyzed the state of preservation of the most recent historical type of house in peasant homesteads in Kashubia, namely a two-story brick house with a semi-flat roof. The survey was conducted in the Puck County area. As many as forty-two sites in sixteen locations were identified and documented. In addition, a method for classifying and evaluating architectural changes under the influence of thermal efficiency improvement has been proposed in the study. The results confirmed the significant scale of transformation: only two buildings remained unchanged, while 67% of them were partially or significantly transformed. The results demonstrate the durability of rural, historical brick buildings and the need to search for and popularize thermal efficiency improvement solutions that meet the conditions for the preservation of such buildings.

20

Technology of obtaining mixed alternative fuel based on organic substances for mining technological transport engines

Melnyk Vasyl, Romanyshyn Liubomyr, Mosora Yurii, Kotwica Krzysztof

Management Systems in Production Engineering

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2023

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nr 1 (31)

71--77

EN

In connection with the increase in the price of fuel based on hydrocarbons, the search and use of alternative types of fuel for machines in the mining and oil production industry is quite relevant today. Most of the existing alternative fuels by themselves cannot be considered as ready-to-use motor fuels. One of the ways to solve this problem is to use their mixtures with commercial fuels in certain ratios. This work deals with the development and research of the main characteristics of the mixer for obtaining mixed fuels based on diesel fuel and soybean oil, as well as the results of the study of the physical and operational properties of the obtained mixtures of different volume ratios of diesel fuel and soybean oil. The process of obtaining a mixed alternative fuel based on diesel fuel and soybean oil was implemented on a developed installation consisting of a mixer, the design of which is protected by a patent of Ukraine, and a gear pump. The study of the characteristics of the mixer as part of the installation showed that at a temperature of the components of the alternative fuel of 20°С, with a loss of full pressure on the mixer Δр ≈ (60-65) kPa, the volume consumption of soybean oil reached 10.7.10-6 m3/s. The time of preparation of the fuel mixture in the amount of 195 liters with a content of soybean oil of 10% ranged from 30 to 33 minutes. As research has shown, mixing soybean oil with diesel fuel in the amount of 5-50% vol. provides an improvement in viscosity-temperature properties and makes it possible to use such mixtures in diesel engines without changes in the design of the power supply system and regulation of fuel equipment, which characterizes soybean oil as a promising additive to diesel fuels to improve their technical and operational performance.