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Abstract

The 11th School on Acousto-optics and its Appli-cations was held during the ICU'2011 - International Congress on Ultrasonics'2011, Gdansk, Poland, 5-8 September 2011, incorporated within the Congress as one of the six structured sessions named as Acousto-optics in the first and the second days being one of the four parallel sessions of other ultrasonic topics of the Congress.

About 60-80 people attended the acousto-optics sessions where 16 papers were presented by participants from Algeria, Belgium, Brasile, France, Japan, Lithuania, Poland, Russia.

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Authors and Affiliations

B. Linde
A. Śliwiński
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Abstract

The issue of war reparations was a subject of controversy in Polish-German relations for a long time. This was due to the position of the Federal Republic of Germany that this issue had been deferred to the moment of German unification. The German concept of reparations also included the individual claims of Polish victims of National Socialism (Nazism). The case for interstate reparations from Germany to Poland was closed as a result of the Polish waiver of 1953, while the issue of individual compensation for Polish victims was symbolically resolved as a result of agreements between Poland and the Federal Republic of Germany only in 1990 and 2000. The scope and amount of any new payments depends on the agreements of particular countries or organizations with the Federal Republic of Germany. As long as the victims are still alive, new pragmatic solutions should not be ruled out.
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Authors and Affiliations

Jerzy Kranz
1 2

  1. Kozminski University (Warsaw)
  2. former ambassador in Germany and Undersecretaryof State at the Ministry of Foreign Affairs
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Abstract

The Author discusses the present state of Polish geography against the background of the traditional position, and the rapid development taking place after the Second World War. The introduction of new methods and new directions, as well as new organization are considered to have been reflected in the rising international position of Polish geography. Further topics here include the relationship between physical and human geography, the growing de facto separation of these two branches, and the development of several independent sciences rooted in geography but now existing apart from it (like geomorphology, climatology, hydrology, etc. on the physical geography side, with the element of the environment as a subject of study). On the other hand, social economic geography examines the effects of human activity in the environment, thereby synthesizing spatial management and bridging the gap between the earth sciences, the economy and the social sciences. The degradation of environmental resources, explosion of the human population and climate change have all forced geography (and other sciences) to head in the global direction, as well as towards interdisciplinary cooperation, likewise on the level of the world as a whole. If we are to meet the challenges this all entails, we will need to think about creating interdisciplinary problem teams, as well as activating existing organisational structures in science (notably the geographical sciences), with full benefit taken from research centres that run studies on differing spatial scales, in conjunction with international global programmes like the Future Earth. The geography of the future should not be a closed science, but should draw on the knowledge of scholars of various specialisations, seeking environmental solutions that require intervention on both the global and regional scales. Polish geography should participate in this activity, inter alia as part of Future Earth, as a new venture. It can also be regarded as our task to ensure that society is aware of all the above issues.

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Authors and Affiliations

Leszek Starkel
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Abstract

Bangladesh is the seventh climate risky country in the world located in South Asia. Progressive economic growth, rapid industrialization and other development efforts are transforming Bangladesh towards a middle-income country. To cope up with the rapid economic growth, the energy supply needs to match energy demand. On the other hand, energy is at the heart of the solution to climate challenge as two-thirds of global greenhouse gas emissions come from the energy sector. At present, around 62% of total electricity depends on gas-fired power generation but its stock is depleting fast due to the increased rate of extraction and use. Considering the shortage of natural resources and being a country worst hit by climate change, the existing state, future prospects, renewable energy policies in Bangladesh are needed to be evaluated to make the existing energy sector more sustainable and modern. A thorough description from secondary sources of the energy sector in Bangladesh is provided in this paper with a special emphasis on the current scenario and future prospects of electricity generation, existing policy issues by using various renewable energy sources. Moreover, a comparison is made regarding the progress in renewable energy sector of Bangladesh with the countries most affected by global climate change. This comparison provides a perspective of how Bangladesh is progressing towards sustainable energy transition while facing problems due to climate change. Finally, recommendations are provided to advance the development of the existing energy sector of Bangladesh to turn it into a sustainable energy sector.
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Authors and Affiliations

Md Moynul Ahsan
1
ORCID: ORCID
Showrov Rahman
2
ORCID: ORCID
Md. Sakib Hossain
3
ORCID: ORCID
Soad Shajid
3
ORCID: ORCID

  1. Department of Real Estate Development and Management, Ankara University, Turkey
  2. Department of Electrical and Electronics Engineering, Gazi University, Turkey
  3. Department of Mechanical and Production Engineering, Islamic University of Technology (IUT), Bangladesh
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Abstract

This article is aimed at the scientific and methodological substantiation of conceptual provisions for the transformation of the national energy system of Ukraine through the formation of eco- -energy clusters. The article analyses international reports on the development of green energy in different countries. An analysis of the dynamics of energy consumption in Ukraine on the basis of renewable sources for 2007–2019 is performed. An algorithm for making a management decision on the transition to renewable energy sources is proposed. In order to transform the national energy system, a conceptual approach to the formation of an eco-energy cluster as an element of innovation infrastructure based on smart specialization is substantiated. It is proven that this structure should be in the form of the partnership of energy companies, business structures, research institutions, higher education institutions, institutions of logistics, energy and innovation infrastructure, and government agencies. This, in turn, will provide a synergistic effect (economic, environmental, social) by improving a number of existing legislations on alternative energy sources, which would increase the economic efficiency of their production, such as: the development of investment projects to attract additional investments in this industry; state guarantees to producers of “clean” energy for its purchase at fixed tariffs; ensuring the level of energy security of Ukraine through the modernization of the network of existing power plants to increase the level of their reliability and uninterrupted operation; the reduction of greenhouse gas emissions from the combustion of traditional fuels.
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Authors and Affiliations

Nataliia Trushkina
1
ORCID: ORCID
Alireza Pahlevanzade
2
ORCID: ORCID
Alborz Pahlevanzade
3
ORCID: ORCID
Yevgen Maslennikov
4
ORCID: ORCID

  1. Department of Regulatory Policy and Entrepreneurship Development, Institute of Industrial Economics of National Academy of Science of Ukraine, Ukraine
  2. Vice-Rector for International Relations, International Humanitarian University, Ukraine
  3. Department of International Law and Comparative Law, International Humanitarian University, Ukraine
  4. Department of Management and Innovations, Odessa I.I. Mechnikov National University, Ukraine
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Abstract

Using loans is an effective solution for the investment and construction of energy works in general and power plants in particular, especially for developing countries. In economic and financial studies of the project investment preparation stage, the options of using capital and paying interest will be taken into account to minimize risks and increase the project’s ability to pay due debts. However, it is difficult to know which loan repayment option is the most beneficial for the project and when the risk is for the project in the context of debt repayment. The current economic and financial analysis of the project mainly focuses on determining the feasibility of the project through basic parameters, such as net present value (NPV), benefit – cost – ratio (B/C), internal rate of return (IRR), profitability index (PI) and payback period (PP). These parameters do not indicate the most difficult time to pay off the project’s loans. This paper analyzes two options for repayment of long-term loans in Vietnam using the case study of Son La hydropower plant to clarify the above difficult times and recommend a suitable repayment plan for the power project. The analytical method is used to actualize the cash flow of capital and interest during the construction and operation of the works. In Option 1, the debt is paid annually for interest and capital with a constant amount of money during the repayment period. In Option 2, the original dept without interest is paid with a constant amount of money during the repayment period, the interest (due to the remaining original capital) must be paid in the year when the interest is incurred. The study results show that the amount of the annual payment in option 1 is smaller than in Option 2 in the first four years (of ten years of debt repayment). Thus, capital and interest payment in Option 2 may be more detrimental than Option 1 in the first three years of debt repayment, and the amount of money from debt repayment is greater than the profit obtained from power generation. Thus, depending on the profit in the first years when the power plant comes into operation, the investor needs to decide on a reasonable way to repay the loan so that the project can self-finance.
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Authors and Affiliations

Le Tat Tu
1
ORCID: ORCID
Vu Minh Phap
1
ORCID: ORCID
Nguyen Thi Thu Huong
1
ORCID: ORCID

  1. Institute of Energy Science, Vietnam Academy of Science and Technology, Viet Nam
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Abstract

Backbreak is an undesirable phenomenon in blasting operations, which can bedefined as the undesirable destruction of rock behind the last row of explosive holes. To prevent and reduce its adverse effects, it is necessary to accurately predict backbreak in the blasting process. For this purpose, the data obtained from 66 blasting operations in Gol-e-Gohar iron ore mine No. 1 considering blast pattern design Parameters and geologic were collected. The Pearson correlation results showed that the parameters of the hole height, burden, spacing, specific powder, number of holes, and the uniaxial compressive strength had a significant effect on the backbreak. In this study, a multilayer perceptron artificial neural network with the 6-12-1 architecture and six multiple linear and nonlinear statistical models were used to predict the backbreakin the blasting operations. The results of this study demonstrated that the prediction rate of backbreak using the artificial neural network model with R2 = 0.798 and the rates of MAD, MSE, RMSE and, MAPE were0.79, 0.93, 0.97 and, 11.63, respectively, showed fewer minor error compared to statistical models. Based on the sensitivity analysis results, the most important parameters affecting the backbreak, including the hole height, distance between the holes in the same row, the row spacing of the holes, had the most significant effect on the backbreak, and the uniaxial compressive strength showed the lowest impact on it.
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Authors and Affiliations

Abbas Khajouei Sirjani
1
ORCID: ORCID
Farhang Sereshki
1
ORCID: ORCID
Mohammad Ataei
1
ORCID: ORCID
Mohammad Amiri Hosseini
2
ORCID: ORCID

  1. Shahrood University of Technology, Iran
  2. Technology Management and Research of Gol-e-gohar, Iran
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Abstract

The paper presents new data on the Miocene development within the Upper Silesian Coal Basin. The Miocene succession of the study area is characterized by high thickness and highly variable lithology. In the Miocene sediments of the studied area, the presence of organic matter in the form of a coal layer, coal crumbs, and dispersed organic matter has been found. The research focused mainly on the analysis of organic matter in terms of its origin, degree of coalification, and depositional environment. The degree of coalification of organic matter was determined by the huminite/vitrinite reflectance. The hard brown coal layer with a thickness of about eight meters was identified within the Kłodnica Formation. Based on the textural properties and degree of coalification, brown coal was classified as dull brown coal and bright brown coal. Organic matter in the form of coal crumbs and dispersed organic matter were found within a package clastic sedimentary. On the basis of petrographic analysis, two types of allochthonous organic matter with different degrees of coalification were identified. The coal clasts are mainly of Carboniferous origin, while the Miocene redeposited brown coal grains dominate within the dispersed organic matter. Coal fragments and dispersed organic matter derived from the Miocene brown coal were also found within the black claystones. The study of organic matter of the Miocene sediments in the Upper Silesian Coal Basin showed both its autochthonous and allochthonous origins.
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Authors and Affiliations

Ewa Krzeszowska
1
ORCID: ORCID
Małgorzata Gonera
2

  1. Silesian University of Technology, Gliwice, Poland
  2. Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland
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Abstract

Background: The phenomenon of accumulating tasks, characteristic of emerging adulthood, intensifies perceived stress and stimulates coping activity. The nature and intensity of the coping strategies used to deal with challenges can affect mental health in emerging adulthood. The purpose of the study was to investigate the relationship between coping strategies and mental health in a group of emerging adults- students in higher education.
Methods: The study included 390 emerging adults, students in higher education. Coping strategies were measured with the COPE Questionnaire and information on mental health was called using the Kutcher Adolescent Depression Scale and the Satisfaction with Life Scale. The confirmatory factor analysis (CFA) with maximum likelihood (ML) estimation was used to assess the factor structure of the variables and structural equation modeling was used to test the hypotheses.
Results: The data mostly confirmed the hypotheses. Avoidance strategies turned out to be the strongest predictor of mental health, specifically negative mental health outcomes. Problem-focused strategies were a stronger predictor of quality of life than emotion-focused and support-seeking strategies. Emotion-focused strategies did not predict depression. Coping strategies, especially avoidance strategies, play a crucial role in mental health during emerging adulthood.
Conclusions: Learning to cope enables students to deal with difficult tasks and challenges of this period more effectively, and minimizes their risk of depression, and increases their life satisfaction.
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Authors and Affiliations

Karol Konaszewski
1
ORCID: ORCID
Małgorzata Niesiobędzka
1
ORCID: ORCID
Marcin Kolemba
1
ORCID: ORCID

  1. University of Bialystok, Faculty of Education, Poland
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Abstract

In this paper, the issues of today's maritime hydrography and its state are discussed. The substance of maritime hydrography and its state of development are presented. The maritime hydrography is shown and discussed from three different points of view: as the kind of maritime human activity and special maritime service; as the maritime profession and field of undergraduate and graduate education, and as the branch of science.
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Authors and Affiliations

Zdzisław Kopacz
Wacław Morgaś
Józef Urbański
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Abstract

According to the European Environment Agency (EEA 2018), air quality in Poland is one of the worst in Europe. There are several sources of air pollution, but the condition of the air in Poland is primarily the result of the so-called low-stack emissions from the household sector. The main reason for the emission of pollutants is the combustion of low-quality fuels (mainly low-quality coal) and waste, and the use of obsolete heating boilers with low efficiency and without appropriate filters. The aim of the study was to evaluate the impact of measures aimed at reducing low-stack emissions from the household sector (boiler replacement, change of fuel type, and thermal insulation of buildings), resulting from environmental regulations, on the improvement of energy efficiency and the emission of pollutants from the household sector in Poland. Stochastic energy and mass balance models for a hypothetical household, which were used to assess the impact of remedial actions on the energy efficiency and emission of pollutants, have been developed. The annual energy consumption and emissions of pollutants were estimated for hypothetical households before and after the implementation of a given remedial action. The calculations, using the Monte Carlo simulation, were carried out for several thousand hypothetical households, for which the values of the technical parameters (type of residential building, residential building area, unitary energy demand for heating, type of heat source) were randomly drawn from probability distributions developed on the basis of the analysis of the domestic structure of households. The model takes the coefficients of correlation between the explanatory variables in the model into account. The obtained results were multiplied so that the number of hypothetical households was equal to 14.1 million, i.e. the real number of households in Poland. The obtained results allowed for identifying the potential for reducing the emission of pollutants such as carbon dioxide, carbon monoxide, dust, and nitrogen oxides, and improving the energy efficiency as a result of the proposed and implemented measures, aimed at reducing low-stack emission, resulting from the policy.

The potential for emissions of gaseous pollutants is 94% for CO, 49% for NOx, 90% for dust, and 87% for SO2. The potential for improving the energy efficiency in households is around 42%.

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Authors and Affiliations

Dominik Kryzia
ORCID: ORCID
Monika Pepłowska
ORCID: ORCID
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Abstract

This work addresses the problem of adaptive observer design for nonlinear systems satisfying incremental quadratic constraints. The output of the system includes nonlinear terms, which puts an additional strain on the design and feasibility of the observer, which is guaranteed under the satisfaction of an LMI, and a set of algebraic constraints. A particular case where the output nonlinearity matches the unknown parameter coefficient is also discussed. The result is illustrated through a numerical example for the chaos synchronization of the Rössler system.
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Authors and Affiliations

Lazaros Moysis
1
Meenakshi Tripathi
2
Mahendra Kumar Gupta
2
Muhammad Marwan
3
Christos Volos
1

  1. Laboratory of Nonlinear Systems – Circuits & Complexity, Physics Department, Aristotle University of Thessaloniki, Thessaloniki, Greece
  2. Department of Mathematics, National Institute of Technology Jamshedpur, Jamshedpur, India
  3. Department of Mathematics, Zhejiang Normal University, Jinhua, China
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Abstract

The present article is concerned with the notion of ‘guilt’ as understood by the legal sciences and in the context of psychology and culture studies. Although legal connotations are unavoidable, ‘guilt’ is a term emotionally related to other feelings like ‘shame’, ‘fear’, ‘sadness’ etc. The analysis shall take a closer look at legal definitions of ‘guilt’ and ‘culpability’ at work in the American, Polish and German legal systems and refer the equivalents existing in these languages (wina,Schuld) to the concept of guilt understood as an emotion. As it turns out, legal definitions do not account for conceptual dimension of meaning and as such, they can only serve as departure points for further analysis to be complemented with cognitive analysis. ‘Guilt’ is a culturally determined and complex emotion that may be ‘dissected’ into several more basic emotional states. The underlying assumption is that there are differences in the understanding of the concept ‘guilt’ across languages which must be taken into account by the translators who deal with translational equivalents.

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Authors and Affiliations

Katarzyna Strębska-Liszewska
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The article deals with the patterns of segmental adaptation of Polish voiceless affricates in initial and fi nal CC (consonant + consonant) clusters by native speakers of English. The data have been collected in an online loanword adaptation experiment in which 30 native speakers of Southern British English reproduced Polish words containing such sequences. The major problem posed by the data is the divergent adaptation of the post-alveolar /͡tʂ/ vs. the pre-palatal /͡tɕ/, with the former substituted mainly with the coronal plosive [t] and the latter realised as the palato-alveolar affricate [͡tʃ]. It is argued that these patterns of nativisation are due to the highlyranked IDENT-IO[dist] constraint, which militates against the modifi cation in the value of the feature [distributed]. Furthermore, it is demonstrated that the experimental results provide evidence in favour of the fundamental assumptions underlying the phonological approach to loan assimilation, namely the phonological input view as well as the faithful perception view.

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Marek Radomski
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Abstract

The paper aims to test a hypothesis of introducing free speech in Polish translations instead of censored renderings typical of post-World War II reality after 1989 when communists lost the parliamentary elections (4th June) and stopped ruling Poland. The new political reality of a democratic system was reasserted by abolishing the censorship apparatus in 1990.
The analysis is based on articles from a magazine Forum. Przegląd Prasy Światowej, which are Polish translations of 10 source texts (STs) - selected articles concerning Polish issues from The New York Times. The STs and their Polish translations have been compared in detail to be able to evaluate the target texts (TTs) according to their correspondence with the STs.
In lieu of the censorship rule of hiding unwanted content and manipulating the audience, also with the propaganda language ( Newspeak), after 1990, the only remaining type of information flow blockage was self-censorship or superiors’ interference. The analysis will discover how topics changed, what happened to the language of propaganda, how the contents of STs are revealed in translations, and what translation techniques are applied in the process of transferring the ST message. The questions posed are, first, how accurate the translations after 1990 are, and second, what reasons might have occurred to have avoided the publication of some contents.
The analysis will be the basis for evaluating translators’ ethics in ST content delivery by reference to Andrew Chesterman (1997, 2001, 2018), Anthony Pym (2001, 2012), Jeremy Munday (2012), Juliane House (2015), and others.
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Authors and Affiliations

Edyta Źrałka
1

  1. University of Silesia
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Abstract

The discourse of advertising offers an environment conducive to the exploitation of novelty in language. Novelty can be conceptualised as an opposite of salience (Giora, 2003), being also a graded feature. Giora claims that there exists a specific level of novelty, which evokes pleasurable experience in recipients. She proposes Optimal Innovation Hypothesis, which may be implied in the investigation of various types of discourse marked with high originality. The paper reports on two studies. The initial one, described in Wojtaszek (2011), focused on the appreciation of three alternative versions of Polish and British advertising slogans, while the subsequent one is the attempt to find a relationship between the previous fi ndings and the degree of legibility of the investigated texts. In the appreciation task the plain formulations received the lowest scores, followed by the highly innovative slogans, with the optimally innovative formulations ranking highest. In the task where evaluation of clarity was performed, the plain formulations turned out to be the easiest, the optimally innovative slogans were a bit more diffi cult, and the highly innovative ones the least conspicuous. A number of interesting dependencies were also found, suggesting further developments for the future.

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Authors and Affiliations

Adam Wojtaszek
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Abstract

Among the most important expressions of the cultural identity of the Silesians are the Silesian dialect and Silesian cuisine. The German-Polish cultural and linguistic contacts that have been present in Silesia for centuries are also manifested in the culinary vocabulary of the regionʼs inhabitants. In addition to numerous loan words of German provenance, which have also been incorporated into Polish literary language, many other lexemes are found in Silesian variety that are related to eating and drinking and have only regional distribution. From a contact linguistic perspective, the article focuses on the court terms of German provenance present in the Silesian dialect, mainly addressing the various forms of borrowing.
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Daniela Pelka
1
ORCID: ORCID

  1. Institut für Sprachwissenschaft Universität Oppeln, Polen
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Abstract

The paper presents the results of field studies carried out in I O chosen forest islands in a suburban area of the town of Jaworzno in the years 1995-2002. Different objects have been studied, among others: natural remnants of oak-hornbeam forest and planted pine-larch woodlots cultivated on the habitat of xerothermic grasslands. In comparison with the total nora of the town, the participation of non-synantropie species and synecological groups associated with natural habitats is much bigger. There are 24 protected species to be found, 40% of protected nora of the town. Despite their diversity, they are precious refugees of many woodland and grassland as well as meadow species occurring within the areas and in their vicinity.
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Damian Chmura
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Abstract

This paper studies hydrodynamic and heat transfer performance of Al2O3/H2O nanofluid flowing through a Bessel-like converging pipe in laminar flow regime using the computational fluid dynamic approach. A parametric study was carried out on the effect of Reynolds number (300– 1200), convergence index (0-3) and nanoparticle concentration (0–3%) on the both hydrodynamic and thermal fields. The results showed the pressure drop profile along the axial length of the converging pipes is parabolic compared to the downward straight profile obtained in a straight pipe. Furthermore, an increase in convergence index, Reynolds number and nanoparticle concentration were found to enhance convective heat transfer performance. Also, a new empirical model was developed to estimates the average Nusselt number as a function of aforementioned variables. Finally, the result of the thermohydraulic performance evaluation criterion showed that the usage of Bessel-like converging pipes is advantageous at a low Reynolds number.
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Authors and Affiliations

Chukwuka S. Iweka
1
Olatomide G. Fadodun
2

  1. Department of Mechanical Engineering, Delta State Polytechnic, Ozoro, P.M.B 5, Ozoro 334111, Delta State, Nigeria
  2. Centre for Energy Research and Development, Obafemi Awolowo University, Ile-Ife 220282, Osun State, Nigeria
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Abstract

The article concerns computer modelling of processes in cooling systems of internal combustion engines. Modelling objectives and existing commercial programs are presented. It also describes Author’s own method of binding graphs used to describe phenomena in the cooling system of a spark ignition engine. The own model has been verified by tests on the engine dynamometer. An example of using a commercial program for experimental modelling of an installation containing a heat accumulator is presented.

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Authors and Affiliations

Zbigniew Kneba
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Abstract

This paper presents the results of an experimental study and
mathematical modeling of the effect of dynamic instabilities on the condensation phase transformation of the refrigerants homogeneous R134a and its replacement in the form of isomers R1234yf and R1234ze and R404A or R507 and R448A in pipe mini-channels. In the case of homogeneous chlorofluorocarbons (CFCs), it is the 1234 isomers that are envisioned as substitutes for the withdrawn ones with high ozone depletion potential and global warming potential. For zeotropic and azeotropic mixtures, for example, these are R507 or R448A. The paper presents a dimensional analysis procedure based on the Buckingham Π theorem to develop a regression velocity model of pressure dynamic instabilities. The experimental part of the work was carried out with the use of tubular mini-channels with internal diameter 1.40–3.3 mm.
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Authors and Affiliations

Waldemar Kuczyński
1

  1. Koszalin University of Technology, Faculty of Mechanical Engineering, Department of Power Engineering, Racławicka 15-17, 75-625 Koszalin, Poland
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Abstract

The electricity production by combustion of organic fuels, especially coal, increases the atmospheric CO2 content, which contributes to global warming. The greenhouse gas emissions by the power production industry may be reduced by the application of CO2 capture and storage systems, but it remarkably decreases the thermal power plant (TPP) efficiency because of the considerable increase of the auxiliary electricity requirements. This paper describes the thermodynamic analysis of a combined cycle TPP with coal gasification and preliminary carbon dioxide capture from the syngas. Utilization of the heat produced in the fuel preparation increases the TPP net efficiency from 42.3% to 47.2%. Moreover, the analysis included the combined cycle power plant with coal gasification and the CO2 capture from the heat recovery steam generator exhaust gas, and the oxy-fuel combustion power cycle with coal gasification. The coal-fired combined cycle power plant efficiency with the preliminary CO2 capture from syngas is 0.6% higher than that of the CO2 capture after combustion and 9.9% higher than that with the oxy-fuel combustion and further CO2 capture. The specific CO2 emissions are equal to 103 g/kWh for the case of CO2 capture from syngas, 90 g/kWh for the case of CO2 capture from the exhaust gas and 9 g/kWh for the case of oxy-fuel combustion.
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Authors and Affiliations

Vladimir Olegovich Kindra
1
Igor Alexandrovich Milukov
1
Igor Vladimirovich Shevchenko
1
Sofia Igorevna Shabalova
1
Dmitriy Sergeevich Kovalev
1

  1. National Research University “Moscow Power Engineering Institute”, Krasnokazarmennaya 14, Moscow, 111250 Russia
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Abstract

The results of the research, which aimed to analyze the acoustic properties of selected sacred buildings located in the city of Czestochowa, Poland are presented in the paper. Three architecturally unusual and completely different from each other churches were selected for the study. The churches differed in shape of their buildings, cubic volume, years of construction, interior furnishings, etc. Nine different objective parameters were used to describe the physical properties of acoustical field in the studied churches. Various factors characterizing the acoustic properties of each building were determined, such as the distribution of sound pressure level (SPL), reverberation time T30, definition D50. Next, they were thoroughly analyzed, so as to ultimately obtain distributions of individual acoustic parameters in the space of the tested building. It allowed to evaluate the quality of the received verbal or musical message depending on the place where the listener was. Further research on speech intelligibility and the musical quality of churches was performed by determining the averaged values of next four objective acoustic parameters: centre time Ts, speech clarity C50, music clarity C80, and speech transmission index (STI). A new approach to analyzing the objective physical parameters describing the sound field was presented in Sec. 4. Mean free path length and critical distance were determined for the investigated acoustic fields in each church and they were associated with a general geometric factor characterizing the complexity of the room shape. The final part of the work presents a comparative analysis of the obtained results of acoustic quality tests of the temples, and thus their usefulness in terms achieving a maximum intelligibility of speech and music. The interesting similarities were found in the spatial distribution of individual acoustic parameters characterizing the distribution of the acoustic field in temples with completely different architecture.
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Authors and Affiliations

Paweł Błaszczak
1
Sylwia Berdowska
2
Janusz Berdowski
1

  1. Department of Experimental and Applied Physics Jan Dlugosz University in Czestochowa, Czestochowa, Poland
  2. Faculty of Electrical Engineering, Department of Power Engineering, Czestochowa University of Technology, Czestochowa, Poland

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