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Wyświetlanie 1-15 z 180
Tytuł:
Groundwater flow through observation well
Autorzy:
Sroka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/241198.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Opis:
The paper presents the analytical solution to the problem of groundwater flow through observation well. Assumptions enabling the formulation of the problem using classical theory of seepage are specified. The solution was derived from the variable separation method. Obtained results confirm the outcomes of investigations, conducted on physical models, published by other researchers. Numerical modelling may be useful to obtain solution of the poblem for more xomplicated case e.g. complex geometry, other boundary conditions, anisotropy of medium. An example of calculation applying finite element method is given.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2002, 49, 4; 77-88
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamic cycle of combustion engine with hydrogen fuelling
Autorzy:
Sroka, Z. J.
Powiązania:
https://bibliotekanauki.pl/articles/246368.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
thermodynamics
hydrogen
Opis:
Shortage of crude oil gives the reason to look for any alternative engine fuel. One of them is the hydrogen, which will be the most lean fuel between others. Knowledge of hydrogen as an engine fuel, its properties, production and storage problems were analyzed in this paper. At the end own hydrogen concept based on Fiat engine 900ccm was shown. Theoretical comparison between thermodynamic cycles for engine run on conventional petrol and hydrogen was done. Results have given the green light to future development. Petroleum recourses run out have given the reasons to find alternative fuel. One of them could be hydrogen. According to analyze done in the project it can be found similarity between hydrogen engine with 1=1,0 to petrol engine with 1=0,9. Pressure of hydrogen charge is in this case higher of 0.42 mpa and there is calculated in strength of existing engine. The results of estimation show possibility to use hydrogen as a engine fuel, maybe first as a dual-fuel engine like LPG system. Emissions of nox for hydrogen engine as well as theoretical engine work cycles for analyzed cases are illustrated in the engine.
Źródło:
Journal of KONES; 2007, 14, 3; 573-578
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Infographics in social media. Selected issues
Autorzy:
Sroka, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/2080381.pdf
Data publikacji:
2022-07-29
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
infographics
visualisation information
social media
searching
designing infographics
Opis:
Technological progress and changes in the lives of contemporary humans have led to a situation in which traditional forms of transferring information by means of text have become too slow, as it takes recipients more time to learn the content of such messages. Researchers emphasise that humans acquire graphic messages better than text. For this reason, presenting information in the form of infographics has become a popular method. The purpose of this article is to present the issue of infographics, including: definitions, types of infographics, and using infographics in different areas of life. An example of their wide use are social media. Based on this example, research was conducted using a searching technique, the purpose being to verify infographics in selected social media. The results of the research allow to acquire information about infographics in terms of popularity in a selected period, scope of topics in infographics and information about sectors and specialists who share infographics in social media most often.
Źródło:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie; 2022, 94, 2; 55-64
1731-6758
1731-7428
Pojawia się w:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Corruption Scandals on Government Accountability
Autorzy:
Żerkowska-Balas, Marta
Sroka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/514725.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Śląski. Wydział Nauk Społecznych
Tematy:
corruption scandals
government accountability
volatility
Opis:
The objective of the article is to examine whether corruption scandals involving members of the ruling party lead to changes in support for the government. It will also explore the extent to which the eruption of such scandals and reporting on them leads to an increase in the number of those opposed to the government, and whether in the long run this leads to the activation of the carrot-and-stick mechanism in respect of the governing political party, reflected in increased voting instability during subsequent elections.
Źródło:
Political Preferences; 2019, 24; 45-56
2449-9064
Pojawia się w:
Political Preferences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Activity of Political Science Researchers in Public Debate: Case Study of Poland
Autorzy:
Sroka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1375456.pdf
Data publikacji:
2021-07-23
Wydawca:
Uniwersytet Śląski. Wydział Nauk Społecznych
Tematy:
visibility
political science researchers
Opis:
This article has several aims. With the help of the original survey data, the article will analyse how Polish political scientists perceive the presence of members of their own scholarly discipline in public debate as desirable and what are their opinions on it. Secondly, the article determines to what extent the political changes initiated in 2015 have affected the general approach to media appearances, and assessments of their content and frequency. Thirdly, an attempt will also be made to determine to what extent the political convictions of political science researchers are correlated with the general assessment of the presence of researchers in public debate, the choice of media in which they are active, and the frequency of their appearances.
Źródło:
Political Preferences; 2021, 28; 49-68
2449-9064
Pojawia się w:
Political Preferences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nepotism and favouritism in the steel industry: a case study analysis
Autorzy:
Sroka, Włdzimierz
Vveinhardt, Jolita
Powiązania:
https://bibliotekanauki.pl/articles/499398.pdf
Data publikacji:
2018
Wydawca:
Wyższa Szkoła Biznesu w Dąbrowie Górniczej
Tematy:
Nepotism
favouritism
steel industry
Polska
Opis:
The term ‘nepotism’, i.e. favouritism granted to relatives, is usually associated with corruption in the public sector and the abuse of public resources. Moreover, it is commonly accompanied by the public image of post-Soviet and/or developing countries. One may, however, observe the manifestations of nepotism in different sectors of the economy. Therefore, the aim of the paper is to analyse the main principles of transparent management of companies operating in the steel sector and deconstruct the myths of nepotism and favouritism. Two basic research methods were used to analyse these phenomena: an analysis of widely accessible information pertaining to the steel companies devoted to anti- nepotism practices (the first stage), and interviews with the managers of steel companies operating in Poland (the second stage). The data collected during the first stage allowed us to analyse the problems associated with nepotism when deconstructing established myths. In turn, interviews with the managers allowed us to compare the data achieved in the first stage to the real perception of this phenomenon and thus to determine the prevalence of these pathologies in the sector analysed. Our research has confirmed that nepotism and favouritism are observed in the sector analysed. However, it is necessary to emphasise that the scale and range of this phenomenon vary, depending on the membership of three groups, i.e. global corporations, companies listed on Warsaw Stock Exchange, and small companies. This implies the need for further research in these sectors.
Źródło:
Forum Scientiae Oeconomia; 2018, Volume 6 (2018) Issue No. 1: Competitiveness of the modern organization: human, ethical and innovative aspects; 31-46
2300-5947
Pojawia się w:
Forum Scientiae Oeconomia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An impact of engine downsizing on change of engine weight
Autorzy:
Sroka, Z. J.
Cieślak, M.
Powiązania:
https://bibliotekanauki.pl/articles/247468.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
downsizing
weight change
Opis:
One of the trends for development of internal combustion engine is downsizing, which in its final form leads to reduction of fuel consumption and limitation of carbon dioxide concentration in the exhaust gases. The obvious effect of reducing the volume of a cylinder is to reduce the dimensions of the various components, e.g. piston with rings and pin, connecting rod, crankshaft, engine block etc. Changes of geometric dimensions also affect the change in mass of each element and consequently − the whole engine. Expected weight reduction will be a benefit in considering downsizing techniques as another significant development trend in automotive applications associated with a reduction in the weight of the complete vehicle – called “light weight vehicle”. The paper discusses the various forms of downsizing (by stroke, by diameter and mix) and their impacts on the changes in engine mass. The engine Subaru Flat 4, constructed with standard components in terms of design and materials was tested by virtual recognition in mass changes. Original drawings of components and sets have been simplified by for example does not account for chamfers and chops. When calculating also omitted the weight of typical accessories (e.g. fuel lines or electronic components), assuming that each considered option has the same equipment. The highest change in the weight of minus 7.27 % relative to the standard engine was done with downsizing by diameter and smallest one (-6.09 %) by downsizing mix.
Źródło:
Journal of KONES; 2015, 22, 2; 213-219
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effectiveness of physical therapy in children with autism
Autorzy:
Sroka, Radosław
Powiązania:
https://bibliotekanauki.pl/articles/1054858.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
autism
children
gross motor skills
psycho-educational profile revised
therapy
Opis:
The main aim of the work was to evaluate the effectiveness of physical therapy conducted with autistic children from the kindergarten at Krzemienna 42B in Szczecin. The research was conducted in the first halves of 2009 and 2010. The diagnostic tool used in order to evaluate gross motor skills was psycho-educational profile – revised (PEP-R). The research group included 8 boys with medically certified autism spectrum disorder. In 2009, out of 126 tasks given, all the tested students performed 104 tasks evaluated as completed, 16 tasks evaluated as promising and 6 tasks evaluated as uncompleted. Only one boy performed all tasks properly. In 2010 the students performed 120 tasks evaluated as completed, 5 as promising and 1 as uncompleted. Four of the autistic boys performed the tasks they were given perfectly. In 2009 the biological age of most tested children was higher than the developmental age in the scope of gross motor skills. Implementing new, individual therapeutic programs based, among other things, on TEEACH tasks, helped to significantly level out the differences.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2014, 7, 3; 107-112
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the engine boost modernized according to the rules of downsizing
Autorzy:
Sroka, Z. J.
Paropkari, M.
Powiązania:
https://bibliotekanauki.pl/articles/243541.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
downsizing
boosting
Opis:
Downsizing is one of the development trends of internal combustion engine due to its direct impact on fuel economy and indirectly in reducing the emission of carbon dioxide into the atmosphere. Changing the displacement associated with the same engine performance needs support by additional systems, which primarily include the boost. This paper describes downsizing idea, a review of recharging methods and thermodynamic analysis of the combustion process for the chosen engine before and after downsizing taking into account the different variants of boost. The core objective of this study is to downsize a naturally aspirated 1.6L BMW PSA engine by 25% of its initial swept volume and then boosting downsized engine with higher-pressure ratio using the turbocharger set. The study focuses on the analysis of four turbochargers from Garrett turbos. The study winds up with the analysis of engine performance based on the values of compression ratio, air-fuel ratio, polytropic exponents of compression and decompression with keeping the same chemical composition of the fuel. At the end, study was resulted with turbocharger Garrett GT1548 as a the best solution form considered ones, because of: wide range of pressure rate, reasonably sufficient for the engine of this size, enough room (60%) for extracting better performance, lower compression ratio value, which counts the rise of brake mean effective pressure, although to a very little extent and leaner mixture at 1,20 value of the air/fuel ratio with maximum power and reduction of fuel consumption, what was satisfied for downsizing techniques.
Źródło:
Journal of KONES; 2015, 22, 3; 235-239
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Spanish Party System and the Issue of Assigning Responsibility
Autorzy:
Sroka, Anna
Powiązania:
https://bibliotekanauki.pl/articles/514751.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Śląski. Wydział Nauk Społecznych
Tematy:
party system
Spanish party system
assigning responsibility
electoral accountability
Opis:
The article addresses the dependency between the level of institutionalization present in the Spanish party system, electoral accountability and assigning responsibility. The primary research objective of this article is to determine the extent to which electoral volatility is present in Spain, both at the aggregate and individual level, which is a measure of the degree of institutionalization reached by a party system. Next, the dependency between electoral volatility and fluidity of elites at the electoral and parliamentary level is analysed. This allows for an answer to the question of whether there is a problem in Spain with assigning responsibility, having regard to the fact that the presence of extensive electoral volatility among both voters and political elites makes it difficult to speak of effective accountability.
Źródło:
Political Preferences; 2015, 11; 162-173
2449-9064
Pojawia się w:
Political Preferences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The risk of large blackout failures in power systems
Autorzy:
Sroka, Krzysztof
Złotecka, Daria
Powiązania:
https://bibliotekanauki.pl/articles/141708.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
blackout
power deficit
power system
risk assessment
extraordinary events
Opis:
The paper concerns the assessment of blackout hazards in the power systems. On the basis of statistical data from more than one hundred failures in power systems that affected the world in the last fifty years, the analysis was carried out regarding the number of people affected by a blackout, power losses in the system, duration of a failure and its direct causes. The paper also describes the methodology of risk analysis and vulnerability analysis of the extraordinary events occurrence in electrical power systems resulting in failures. The structure of risk analysis was based on the bow tie model, identifying threats, unwanted events, barriers and consequences of a system failure. Moreover, particular attention was drawn to the impact of the power reserve deficit in the Polish Power System in the coming years on the increase in the risk of a blackout failure.
Źródło:
Archives of Electrical Engineering; 2019, 68, 2; 411-426
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular diagnostics of Sarcocystis spp. infections
Autorzy:
Stojecki, K.
Karamon, J.
Sroka, J.
Cencek, T.
Powiązania:
https://bibliotekanauki.pl/articles/2088002.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
molecular diagnostics
Sarcocystis
infection
sarcocystosis
polymerase chain reaction
Opis:
Protozoa of the genus Sarcocystis (phylum Apicomplexa, family Sarcocystidae) is one of the most common parasites affecting animals. Interspecies diagnostic of Sarcocystis genus was based on electron microscopy for many years. Because of absence of visible differences between species with reachable magnifications, light microscopy is useless. In many cases serological diagnostic method have lack of sensitivity. A variety of molecular methods have been developed and used to detect and identify Sarcocystis spp. and to assess the genetic diversity among this protozoan from different population/hosts. Nowadays, molecular diagnostic is the common, time/cost effective method used all over the world to interspecies differentiation.
Źródło:
Polish Journal of Veterinary Sciences; 2012, 15, 3
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal loads of engines for different properties of commercial fuels
Autorzy:
Sroka, Z. J.
Reksa, M.
Miksiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/243852.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diesel engine
thermal loads
fuels
Opis:
It is oblivious, various properties of fuels cause different thermal loads of engines. Question is, how big is this effect and what fuel compound and its property play insignificant part. This paper is focused on problem of quality of diesel commercial fuels in Polish market and it is a challenge to find answer for question mentioned above. The academic staff from Wroclaw University of Technology organized tests with different commercial fuels. Chemical and physical properties of these fuels were studied and used for investigation to define relationships between them and thermal load during simulation process. All researches were done in the lab of Division of Motor Vehicles and Internal Combustion Engines at the Wroclaw University of Technology. Tests have showed differences in chemical and physical properties of fuels, but there is no statistics effect on engine parameters. Results have not also pointed any important differences in thermal loads of engine VW1,9 TDI and its components according to different physical and chemical properties of tested fuels. It is probably because there are differences of calorific values from one side but from other hands various density and specific fuel consumption compensated these differences. To burn unit of fuel contains higher level of oxygen, engine needs lower amount of air, so it gives, for the same fuelling system, lean mixture. It causes higher temperature of exhaust gases and a bit higher exhaust losses
Źródło:
Journal of KONES; 2008, 15, 2; 463-467
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Translucent concrete as the building meterial of the 21st century
Beton transparentny jako materiał budowlany XXI wieku
Autorzy:
Halbiniak, J.
Sroka, P.
Powiązania:
https://bibliotekanauki.pl/articles/792519.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2015, 15, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 180

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