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Wyświetlanie 1-15 z 955
Tytuł:
Problems of determining mean indicator pressure of piston combustion engines from developed indicator diagrams
Autorzy:
Monieta, J.
Powiązania:
https://bibliotekanauki.pl/articles/244070.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
marine diesel engines
indicator diagrams
mean indicated pressure
Opis:
The paper presents methods for processing and analysis of in-cylinder pressure course in the combustion chamber of marine engines. In literature are described determinate methods ofmean indicator pressure from closed diagrams, with are but rarely recorded than developed diagrams. There have been showed on limitations occurrence at measurements fast-changed pressures of marine diesel engines in operating conditions and measuring errors the attendants. Mean indicated pressure determined from the indicated timing or angular pressure courses in the cylinders is still a reliable diagnostic symptom. The paper presents too the results of experimental measurement of in-cylinder pressure signals, medium speed marine engines with application resistive sensor and using the photo-optical sensor of crankshaft position, and without the marker position of the crankshaft. Not always possible to altach the marker for the position of the crankshaft, and even there is no way of stopping the engine when you need to diagnose it. The top dead centre of the piston can be determined then analytically. The work developed a method of determining the mean indicated pressure of the developed indicator diagrams. Based on calculations ofmean indicator pressure made many of diagnosis of the medium speed marine diesel engines in the operating conditions.
Źródło:
Journal of KONES; 2010, 17, 3; 301-306
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the Agroclimatic Areas of Slovakia in 1961–2020
Autorzy:
Kišš, Vladimír
Minárik, Martin
Čimo, Ján
Tárník, Andrej
Mikulová, Katarína
Powiązania:
https://bibliotekanauki.pl/articles/27323829.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
agroclimatic area
temperature indicator
moisture indicator
wintering indicator
Opis:
The World Meteorological Organisation predicts an increase in average annual temperature. As a result of climate change in Slovakia, one can expect changes in the distribution of precipitation and moisture availability, changes in the temperature availability of crop production, changes in wintering conditions, and many others. The aim of this work was the analysis of agroclimatic indicators for the period 1961–1990 and 1991–2020. The results showed an increase in the sums of temperatures in the growing season. Also, the increase in temperature resulted in a change in the zones of the agroclimatic indicator of moisture and the agroclimatic indicator of wintering. The zones have been shifting to higher altitudes throughout Slovakia.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 293--300
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic symptoms of piston combustion engines of ship main propulsion received from its developed indicator diagrams
Autorzy:
Rosłanowski, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/244511.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
leakage of combustion chamber
errors of developed indicator diagrams
characteristic points of developed indicator diagrams
Opis:
The following article describes parameters of developed indicator diagrams concerning piston combustion engine of ship main propulsion, which can be used to assess its technical condition. To make a diagnosis of the engine combustion only such parameters should be selected which are characterized by high information value, being closely connected with its one defined structure. This is the cause why such connections are of unmistakable character, which allows to make the right diagnosis of technical condition of piston engine. Special attention was also paid to the consequences of diagnostic symptoms qualification from developed indicator diagrams of ship propulsion engine working in different conditions. Deflection of average indicated pressure caused by inappropriate engine performance could be caused by: 1) faulty adjustment of injection pump; 2) leaky combustion chamber, 3) bad technical condition of injection apparatus and the loading air system. Wrong technical condition of the engine caused by a leaky combustion chamber brings about a decrease of its performance. Untight combustion chamber causes the change of such parameters as, suction pressure, pressure of final compression and burning, as well as, the change of exhaust gases composition, which influences the power of the engine and fuel consumption. It has been mentioned what gas pressures of working process in engine cylinders are connected with an untight combustion chamber. Random character of burning pressure course in engine cylinder has also been paid attention to. Reliability of diagnostic parameters of piston engine technical condition received based on developed indicator diagrams have been determined. Diagnostic symptoms have been defined, basing on measurements and statistical analysis of pressure values in the cylinders of properly adjusted engines being in excellent technical condition and not based on measurements received in the engine test bed of a new engine.
Źródło:
Journal of KONES; 2013, 20, 2; 355-362
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation accuracy of combustion chamber tightness in piston engines, on the basis of a developed indicator diagram
Autorzy:
Rosłanowski, J.
Charchalis, A.
Powiązania:
https://bibliotekanauki.pl/articles/246594.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
leakage of combustion chamber
errors of developed indicator diagrams
characteristic points of developed indicator diagrams
Opis:
The following article describes the effect of combustion chamber leakage of piston engine on the quality of its performance. To make a diagnosis of combustion chamber tightness, only such parameters were selected which are characterized by high information value and are closely connected with its defined structure. For this reason such connections are unmistakable, which results in making the right diagnosis of combustion chamber tightness of piston engines. Special attention was paid to the fact, what consequences, combustion chamber leakage, can cause to the piston engine performance. The most dangerous for the engine efficiency is the leakage of combustion chamber. The leakage of combustion chamber brings about the change of such engine parameters as pressure of suction, pressure of final compression and burning and the change of exhaust gases composition, which effect on the engine power and on fuel consumption. Condition of piston rings and their influence on gas pressure in combustion chamber has also been characterized. Pressure of gases taking place in engine cylinder and their connection with leakage of combustion chamber have also been described. The article also exposes random character of combustion pressure in engine cylinder. Besides, the errors of indicator diagrams together with mapping error position GMP have been mentioned too. Reliability of diagnostic parameters of technical condition of combustion piston engines obtained on the basis of developed indicator diagrams has been defined. Such diagram must be made on the basis of measurements and statistic analysis of pressure parameters in correctly adjusted engines, being in perfect technical condition, and not on the basis of measurements obtained in the engine test bench of a new engine. Bad technical condition, especially leaks in its cylinders causes power differences in engine arrangements, which endangers its safe exploitation.
Źródło:
Journal of KONES; 2013, 20, 3; 339-345
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecological indicator values of some lichen species noted in Poland
Autorzy:
Fabiszewski, J.
Szczepanska, K.
Powiązania:
https://bibliotekanauki.pl/articles/56816.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
ecological indicator value
lichen species
Polska
species list
Opis:
The paper presents the ecological indicator values for 360 lichen species noted in Poland. For the given species estimated were the climatic indicators (light, temperature, moisture) and the edaphic ones (trophicity, habitat acidity). The estimate is based mainly on field studies and Polish lichenological literature. Presented are also the dynamics tendencies, i.e expansion or dieback of the analyzed species. According to papers by Polish authors, concerning various groups of plants, used were five degrees' scales of the analysed indices.
Źródło:
Acta Societatis Botanicorum Poloniae; 2010, 79, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of isolation indicator for explaining tourism arrivals on tropical islands
Autorzy:
Podhorodecka, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/2030323.pdf
Data publikacji:
2008-06-01
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
isolation indicator
tropical islands
intensity of tourism
Opis:
The aim of the article is verification of possibility of use of UNEP isolation indicator for measuring isolation of tropical islands for tourism purposes. 30 tropical islands were included in the study. The correlation between intensity of tourism movement and isolation indicator by Spearman rank correlation was -0,46. More isolated islands have smaller intensity of tourism movement and less isolated have higher intensity of tourism movement ratio. But there are also exceptions from this rule - territories which are more isolated and with higher intensity of tourism movement such as Maldives and less isolated with the smaller intensity of tourism movement such as Sao Tome and Principe. UNEP isolation indicator is not ideal measure for tourism purposes.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2008, 13; 259-265
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Architectural Place Identity – an Authorial Proposal of a Measurement Indicator
Autorzy:
Dudzik-Deko, Paulina
Rzeźnik, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/23050761.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Opolski
Tematy:
identity
place identity
architecture
place identity indicator
Opis:
The architectural place identity belongs to the historical and cultural heritage related to landscape architecture. It exerts a great impact on both the observers’ perception of the given space and their emotional attitude. The authors’ main goal was to create a tool that would enable objective assessment and measurement of the place identity phenomenon. Accordingly, the aim of this article is to present the result of accepting this approach – an architectural place identity indicator, as well as to discuss and promote conducting more research into this subject. It also provides the definition and clarification of the analyzed term. The measurement indicator of the chosen phenomenon has been presented against the background of the City of Wrocław and its urban public areas. The applied method allowed examining the analyzed issues within the given spatial range. The article comprises a complete theoretical description of the research and reveals all the options of its use in practice.
Źródło:
Studia Miejskie; 2022, 43; 83-96
2543-5302
2082-4793
Pojawia się w:
Studia Miejskie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PISA Science Score: A Good Indicator of Competence in S & T?
Autorzy:
Shi, Wei-Zhao
Powiązania:
https://bibliotekanauki.pl/articles/26469703.pdf
Data publikacji:
2013-03-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
PISA
science education
indicator
competence in science and technology
Opis:
In this study, the data from the Programme for International Student Assessment (PISA) are used to investigate whether the PISA science test score is a good indicator of competence in science and technology. The researcher uses a number of scientific and technical journal articles per million people as a measure instrument to represent the competence of science and technology. A regression model analysis suggests that the PISA science scores would significantly predict competence in S & T, even when controlling the number of researchers in R&D per million people and the R&D expenditure (% of GDP). Moreover, it shows that R&D expenditure (% of GDP) is another important determinant of the competence in S & T. Multicollinearity is also found between the R&D expenditure (% of GDP) and the number of researchers in R&D per million people. The policy implication is clear.
Źródło:
The New Educational Review; 2013, 31; 51-59
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysing applicability of selected methods to smooth indicator diagrams of marine medium-speed engine
Autorzy:
Pawletko, R.
Powiązania:
https://bibliotekanauki.pl/articles/259730.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
indicator diagrams
smoothing waveforms
filtering disturbances
Opis:
The article analyses the applicability of selected smoothing methods to smooth indicator diagram curves and to filter disturbances. An intermediate goal of the study was an attempt to extract disturbances recorded during pressure curve smoothing, which are believed to be a source of important diagnostic information. Within the framework of the reported analysis, a comparison was made between the moving average method, the Savitzky-Golay filter, and the frequency filtration method. The research was performed on a marine medium-speed engine Sulzer 3Al 25/30, which has a relatively long indicator passage.
Źródło:
Polish Maritime Research; 2015, 2; 55-61
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the indicator diagrams smoothing on the indicated parameters of marine diesel engines
Autorzy:
Pawletko, R.
Powiązania:
https://bibliotekanauki.pl/articles/244800.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
indicator diagrams
smoothing the interference
engine indicated parameters
Opis:
The topic of this article is to analyze the influence of indicator diagrams smoothing methods on diagnostic parameters determined on their basis such as the maximum combustion pressure, mean indication pressure and heat release characteristics. Indicator diagrams of marine engines are subject to serious distortions arising primarily from the measuring method for in-cylinder pressure. Measurements are performed on the indicator valve which connect with the combustion chamber through the indicator channel. Depending on the engine design the channel length can reach a considerable length and introduces significant distortion in both the phase and amplitude of the pressure signal. Further analysis of the indicator diagram eg. in order to determine the heat release characteristics requires the use of methods of smoothing and filtering of interference. The results confirm no effect of indicator diagram smoothing for the value of the mean indicated pressure, which is one for the most important indicated parameters. A significant influence of smoothing on the maximum value of the heat release rate was observed. The differences in this case exceed 50%. At the same time confirmed that the heat release rate curve determined on the basis of a diagram without smoothing, carry a high level of interference, which precludes their practical use. Smoothing allows getting heat release rate curves that carry vital information about the working process of the engine.
Źródło:
Journal of KONES; 2015, 22, 2; 169-176
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Indicator for Ionospheric Biases Interpolation in the Network RTK
Autorzy:
Próchniewicz, D.
Walo, J.
Powiązania:
https://bibliotekanauki.pl/articles/225145.pdf
Data publikacji:
2012
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
quality indicator
network RTK
ionosphere
wskaźnik jakości
sieć RTK
jonosfera
Opis:
This paper presents the methodology and performance of an ionospheric quality indicator in the Network RTK. A new index called Zenith Ionospheric Residual Interpolation Uncertainty, which is an extension of the existing indicator is proposed and evaluated using the reference station test network. The dataset used for this study was collected during ionospheric storm period in order to test the indicator during disturbed ionospheric conditions. The test results show that the proposed indicator provides a realistic prediction of ionospheric interpolation accuracy and can be used to predict the Network RTK performance at rover location.
Źródło:
Reports on Geodesy; 2012, z. 1/92; 7-21
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sarcosoma globosum - an indicator of climate change?
Autorzy:
Ohenoja, E.
Kaukonen, M.
Ruotsalainen, A.L.
Powiązania:
https://bibliotekanauki.pl/articles/67193.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
Sarcosoma globosum
indicator
climate change
Ascomycota
Sarcosomataceae
distribution
ecology
habitat
Opis:
Occurrence of a spring ascomycete, Sarcosoma globosum has increased in Finland during the last three decades. River banks and old spruce forests are its typical habitats. Some of its habitats are damaged or even destroyed, however, because of forestry and building of roads and houses. It is a care-demanding fungus on the Finnish Red List, according to the IUCN criteria, but its present status is being discussed.
Źródło:
Acta Mycologica; 2013, 48, 1
0001-625X
2353-074X
Pojawia się w:
Acta Mycologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indicators Of Sustainable Development In Framework Of Environmental Policy Experience Of Eastern Neighbors
Autorzy:
Khlobystov, Ievgen
Zharova, Liubov
Eremeeva, Natalia
Powiązania:
https://bibliotekanauki.pl/articles/476323.pdf
Data publikacji:
2016
Wydawca:
Wyższa Szkoła Ekonomiczno-Humanistyczna w Bielsku-Białej
Tematy:
sustainable development indicator
indicator sets
composite (aggregate) indicator
organizing framework
core set of indicators
pressure-state-response model
driving force
pressure
state
impact
Opis:
The sustainable development indicators perform an essential function of incorporating knowledge about the development of human society into decision making at all stages from planning and implementation to evaluation of the policy impacts. This paper provides an overview of evolution and application experience of sustainability measuring practice. Researchers analyze the directions of measurement approach progress. Modern trends of indicators’ using are explored. From assessment of current status of sustainable development indicators authors reveal the main challenges in defining an appropriate set of them. The ways of overcoming the lack of harmonization in variety of conceptual and organizational frameworks used by the different countries are reviewed. Authors consider the direction of modernization of SDI system. The importance of measuring sustainable development at different scale levels: local, regional, enterprise and household levels is stressed. Researchers reveal the main task in division of responsibilities of national authorities; managing data quality and data accessibility. An additional challenge of providing better analysis of cross linkages between indicators is pointed out.
Źródło:
MIND Journal; 2016, 1; 1-10
2451-4454
Pojawia się w:
MIND Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing diagnostic applicability of heat release characteristics determined based on ship engine indicator diagrams
Autorzy:
Polanowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/258814.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship piston engines
indicator diagrams
heat release
characteristics
diagnostic application
Opis:
In order to determine indicator diagrams-based heat release characteristics, a single- zone model of net heat release was used for perfect gas. It was proved that when a constant value for isentropic exponent is assumed, the error in determining the characteristics can be limited to 1% at the nominal load. The effect of errors in determining the position of piston TDC, as well as that of gas passages and indicator valves on the calculated characteristics was evaluated. It was shown that for low-speed engines the effect of gas passages in negligible, while for medium-speed engines the characteristics reveal some deformations (waves), which are repeatable for an individual cylinder in the examined engine construction. The results of the performed investigations and analyses suggest possibility and advisability of the use of heat release characteristics in diagnosing ship engines, in particular low-speed machines.
Źródło:
Polish Maritime Research; 2009, 3; 32-35
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slowdown or Recession? Forecasts Based on Composite Leading Indicator
Autorzy:
Klúcik, Miroslav
Juriová, Jana
Powiązania:
https://bibliotekanauki.pl/articles/483289.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Global economic crisis
recession
composite leading indicator
ARIMAX model
error correction model
Opis:
The economy of Slovakia experienced a turning point in the 1st half of 2008 and entered a phase of decline. The negative impacts of the global economic crisis became evident in the 2nd half of 2008 and led into a recession in the 1st quarter of 2009. The composite leading indicator was originally intended for forecasting of business cycle turning points between the decline and growth phases. The aim of this paper is to transform the qualitative information from composite leading indicator into quantitative forecast and verify whether the beginning of recession in Slovakia could have been identified in advance. The ARIMAX and error correction models are used for the composite reference series and GDP forecasts respectively. The final result shows that the composite leading indicator is useful not only for identifying turning points, but also for the prediction of recession phase.
Źródło:
Central European Journal of Economic Modelling and Econometrics; 2010, 2, 1; 17-36
2080-0886
2080-119X
Pojawia się w:
Central European Journal of Economic Modelling and Econometrics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 955

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