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Tytuł:
The analysis of work shift patterns and risk of fatigue in aircraft maintenance personnel: a case study
Autorzy:
Basaria, Fransisca Tiur
Powiązania:
https://bibliotekanauki.pl/articles/27311329.pdf
Data publikacji:
2023
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
fatigue
work shift pattern
aircraft maintenance
risk analysis
zmęczenie
schemat zmiany pracy
konserwacja statków powietrznych
analiza ryzyka
Opis:
In response to the COVID-19 pandemic in 2020, PT. XYZ, the biggest aircraft maintenance, repair, and overhaul (MRO) company in Indonesia, implemented a new shift pattern for line-maintenance personnel. The new shift pattern allows maintenance personnel to have fewer working hours per day (7-hour shifts) in more shift varieties for 5 consecutive days. Maintenance personnel will have 2-morning shifts, 1-noon shift, and 2-night shifts followed by 3 rest days. This study aims to explore the risk of fatigue caused by the newly implemented shift pattern. Data were collected through electronic questionnaires from a total of 303 respondents. This study found that at the time of the survey, many respondents (78 of 303, 26%) felt tired and had difficulty concentrating, regardless of the shift they were in. Based on the duty time, the highest scores of level 6 (tired, difficult to concentrate) were discovered on night shift day 5. This result shows that although the organization had provided the maintenance personnel with the opportunity to obtain sleep during rest days, tiredness and fatigue were still experienced by the aircraft maintenance personnel. This study recommends necessary actions to be taken to prevent fatigue, especially from the noon shift afterwards, where fatigue level is increasing, and alertness level is decreasing.
Źródło:
Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 118; 5--16
0209-3324
2450-1549
Pojawia się w:
Zeszyty Naukowe. Transport / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Disparities in the level of regional technical infrastructure development in Poland: multicriteria analysis
Autorzy:
Miłek, Dorota
Powiązania:
https://bibliotekanauki.pl/articles/22443135.pdf
Data publikacji:
2022
Wydawca:
Instytut Badań Gospodarczych
Tematy:
regional infrastructure
regional disparities
Poland’s voivodeships
taxonomic analysis
multicriteria analysis
Hellwig development pattern method
Opis:
Research background: The development policy currently promoted by the European Union is focused on the use of the territory?s internal resources. Among the factors affecting regional development, by building its potential, infrastructure, being a basic necessity for developing activity in a given area, is of significant importance. Hence, investment in infrastructure is critical to stimulating economic dynamism, as it is the basis for supporting a variety of measures aimed at economic growth. Purpose of the article: This paper aims to evaluate the level of development of technical infrastructure and changes taking place in this field in Polish voivodeships in 2008 and 2020. Methods: The study was carried out using the Hellwig development pattern method and a comparative analysis of the technical infrastructure of Polish regions. The above approach makes it possible to measure the diversity of the state and availability of infrastructure for the communities of the regions. Findings & value added: While implementing the study aim, particular attention was paid to the spatial differences in the level of development of the technical infrastructure of Polish voivodeships. The analysis enabled to distinguish groups of voivodeships with the highest, high, low, and very low level of technical infrastructure development. From a long-term perspective, the conducted research can be seen as a contribution to existing research and serve to further compare the impact of technical infrastructure on the economic development of countries. The strength of the study is the adequately long time span of the analysis (2008 ? the period of the financial crisis and 2020 ? the COVID 2019 pandemic), which provides a basis for the formation of the infrastructure in question. The added value of the article is also a regional perspective on the level of development of technical infrastructure using multidimensional methods of statistical analysis. The results of the study can be used to make decisions at the national level regarding the retrofitting of infrastructure in regions with a low level of infrastructure development. For the European Union's decision-makers they can be a source of knowledge of where to direct EU funds the purpose of which is the infrastructural development of regions.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2022, 17, 4; 1087-1113
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of helicopter swash-plate wear using the FAM-C diagnosis method
Autorzy:
Gębura, Andrzej
Kowalczyk, Henryk
Tokarski, Tomasz
Handzel, Kacper
Klimaszewski, Sławomir Jerzy
Zgrzywa, Franciszek
Powiązania:
https://bibliotekanauki.pl/articles/2096175.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
frequency analysis
blade tip timing
bearing wear
gear wear
alternator
frequency modulation
power transmission
characteristic pattern
helicopter swash-plate
analiza częstotliwości
metoda wirującego obserwatora
zużycie łożyska tocznego
zużycie przekładni
modulacja częstotliwości
transmisja mocy
śmigłowiec
Opis:
Helicopter rotor dynamics (blade vibrations, ground resonance, influence of forward speed, etc.) play an important role in the wear and tear of the transmission system and power unit. Particularly fast wear of these components is to be expected in military helicopters in combat conditions, where the flight dynamics parameters are often exceeded. The FAM-C method developed at the Air Force Institute of Technology in Poland has been used to assess and monitor this wear. This method can be used to monitor damage to helicopter propulsion and transmission, where other "classical" methods are less effective due to a very complicated system of forces, variable as to the direction of amplitude and frequency, causing vibrations in closely spaced kinematic pairs. For this reason, vibroacoustic and thermal effects are created around these kinematic pairs, which interfere with each other. In a helicopter, the propulsion unit, including the power transmission unit, is at the same time the carrier unit. This has forced designers to construct a propulsion system with a much greater number of joints and bearing supports. This article presents the possibilities of the FAM-C method for monitoring of swash-plate main bearing wear. The swash-plates are not formally part of the helicopter's propulsion unit but are used to direct the thrust vector of the blades i.e., they direct the helicopter's power vector. Since during this process their components are observable by the FAM-C method, the authors found it necessary to include issues related to their diagnosis in this study. In the FAM-C method, the signal from the AC generator during the normal operation of the helicopter is processed. Analysis of this signal allows simultaneous monitoring of multiple engine and transmission components simultaneously. It does not require any separate sensors for this purpose - one "full-time" alternator or tachometer generator is - with proper collection and processing of the output voltage signal - the source of a whole range of diagnostic information. Thus, one generator is an observer of the technical condition of many elements of the power unit simultaneously. What's more, the signal can be collected from any place in the electrical network, which makes it possible to install the measuring system in safe locations, even while the power train is running. Some examples of diagnostic symptoms leading to wear detection are described. Research based on analysis of these findings with the use of the FAM-C method is described in the paper. In the FAM-C method, signal from the AC generator used in routine operation of the helicopter is processed. Signal analysis enables simultaneous monitoring of several engine and transmission elements. Some examples of diagnostic symptoms used to detect wear are described in the paper.
Źródło:
Diagnostyka; 2022, 23, 1; 1--12
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Regionalisation of watersheds with respect to low flow
Autorzy:
Cupak, Agnieszka
Michalec, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/2174343.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
cluster analysis
low flow
regional regression
residual pattern approach
watershed
Opis:
The aim of the study was to compare two grouping methods for regionalisation of watersheds, which are similar in respect of low flow and chosen catchments parameters (physiographic and meteorological). In the study, a residual pattern approach and cluster analysis, i.e. Ward’s method, were used. The analysis was conducted for specific low flow discharge q95 (dm3∙s-1∙km-2). In the analysis, 50 catchments, located in the area of the upper and central Vistula River basin, were taken. Daily flows used in the study were monitored from 1976 to 2016. Based on the residual pattern approach (RPA) method, the analysed catchments were classified into two groups, while using the cluster analysis method (Ward’s method) - into five. The predictive performance of the complete regional regression model checked by cross-validation R2cv was 47% and RMSEcv= 0.69 dm3∙s-1∙km-2. The cross validation procedure for the cluster analysis gives a predictive performance equal to 33% and RMSEcv= 0.81 dm3∙s-1∙km-2. Comparing both methods, based on the cross-validated coefficient of determination (R2cv), it was found that the residual pattern approach had a better fit between predicted and observed values. The analysis also showed, that in case of both methods, an overestimation of specific low flow discharge q95 was observed. For the cross-validation method and the RPA method, the PBIAS was -10%. A slightly higher value was obtained for the cross-validation method and models obtained using cluster analysis for which the PBIAS was -13.8%.
Źródło:
Journal of Water and Land Development; 2022, 55; 47--55
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Robust content-based image retrieval using ICCV, GLCM, and DWT-MSLBP descriptors
Autorzy:
Chavda, Sagar
Goyani, Mahesh
Powiązania:
https://bibliotekanauki.pl/articles/27312841.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
content-based image retrieval
improved color coherence vector
gray-level co-occurrence matrix
discrete wavelet transform
multi-scale local binary pattern
principal component analysis
linear discriminant analysis
Opis:
Content-based image retrieval (CBIR) retrieves visually similar images from a dataset based on a specified query. A CBIR system measures the similarities between a query and the image contents in a dataset and ranks the dataset images. This work presents a novel framework for retrieving similar images based on color and texture features. We have computed color features with an improved color coherence vector (ICCV) and texture features with a gray-level co-occurrence matrix (GLCM) along with DWT-MSLBP (which is derived from applying a modified multi-scale local binary pattern [MS-LBP] over a discrete wavelet transform [DWT], resulting in powerful textural features). The optimal features are computed with the help of principal component analysis (PCA) and linear discriminant analysis (LDA). The proposed work uses a variancebased approach for choosing the number of principal components/eigenvectors in PCA. PCA with a 99.99% variance preserves healthy features, and LDA selects robust ones from the set of features. The proposed method was tested on four benchmark datasets with Euclidean and city-block distances. The proposed method outshines all of the identified state-of-the-art literature methods.
Źródło:
Computer Science; 2022, 23 (1); 5--36
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An experimental study of the vibrational characteristics of a diamond circular blade using electronic speckle-pattern interferometry and fem
Autorzy:
Tkach, Mykhaylo
Halynkin, Yurii
Proskurin, Arkadii
Zhuk, Irina
Kluchnyk, Volodymyr
Bobylev, Igor
Powiązania:
https://bibliotekanauki.pl/articles/1837945.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
interferometry
speckle pattern
correlation fringes
vibration analysis
Opis:
The compact installation and technology for determining vibration characteristics by the ESPI method has been created. The experimental determination of the dynamic characteristics of a diamond circular blade with a diameter of 203.4 mm and a thickness of 1.19 mm using real-time electronic speckle interferometry is presented. 15 mode shapes of vibration were detected in the range from 100 to 5000 Hz. The program calculation of the natural frequencies and mode shapes is carried out for three values of the clamping inner diameter (42 mm, 44 mm, 46 mm). The options for calculating a disk with a rim and without a rim are considered. It is shown that the minimum mean squared error of the calculation is achieved for the values of the diameter of the disk 46 mm, 42 mm and 44 mm for the number of nodal circles 0, 1 and 2, respectively. To verify the accuracy of the interferometer, experimental, computational and analytical studies of console steel rod 200 x 22.25 x 3.78 mm in size were carried out.
Źródło:
Acta Mechanica et Automatica; 2021, 15, 1; 16-23
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of infill and density pattern on the mechanical behaviour of ABS parts manufactured by FDM using Taguchi and ANOVA approach
Autorzy:
Othmani, M.
Zarbane, K.
Chouaf, A.
Powiązania:
https://bibliotekanauki.pl/articles/2175753.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
fused deposition modelling
infill pattern
infill density
finite element analysis
Taguchi
modelowanie metodą osadzania topionego
wzór wypełnienia
gęstość wypełnienia
analiza elementów skończonych
Opis:
Purpose: The present work aims to investigate the effect of many infill patterns (rectilinear, line, grid, triangles, cubic, concentric, honeycomb, 3D honeycomb) and the infill density on the mechanical tensile strength of an Acrylonitrile Butadiene Styrene (ABS) test specimen manufactured numerically by FDM. Design/methodology/approach: Computer-Aided Design (CAD) software has been used to model the geometry and the mesostructure of the test specimens in a fully automatic manner from a G-code file by using a script. Then, a Numerical Design of Experiments (NDoE) has been carried out by using Taguchi method and the Analysis of Variance (ANOVA). The tensile behaviour of these numerical test specimens has been studied by the Finite Element Analysis (FEA). Findings: The FEA results showed that a maximal Ultimate Tensile Strength (UTS) was reached by using the ‘concentric’ infill pattern combined with an infill density of 30%. The results also show that the infill pattern and the infill density are significant factors. Research limitations/implications: The low infill densities of 20% and 30% that have already been used in many previous studies, we have also applied it in order to reduce the time of the simulations. Indeed, with high infill density, the simulations take a very excessive time. In an ongoing study, we predicted higher percentages. Practical implications: This study provided an important modelling tool for the design and manufacture of functional parts and helps the FDM practitioners and engineers to manufacture strong and lightweight FDM parts by choosing the optimal process parameters. Originality/value: This study elucidated the effect of various infill patterns on the tensile properties of the test specimens and applied for the first time a NDoE using numerical test specimens created by the mesostructured approach, which considerably minimized the cost of the experiments while obtaining an error of 6.8% between the numerical and the experimental values of the UTS.
Źródło:
Archives of Materials Science and Engineering; 2021, 111, 2; 66--77
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Tests of the Vector II Slab in Field Conditions, Slab and Strip Model
Autorzy:
Zając, Jakub
Drobiec, Łukasz
Jasiński, Radosław
Wieczorek, Mirosław
Kisiołek, Artur
Powiązania:
https://bibliotekanauki.pl/articles/1838083.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
crack pattern
flexural analysis
interface
precast
slab
short-term load
pęknięcia
zginanie
prefabrykaty
płyty
obciążenie krótkotrwałe
Opis:
Vector II slab was tested on a natural scale (a slab with a dimension of 6.30 × 6.30 m) and a strip 6.30 m long and 1.20 m wide. The Vector II slab is built by precast panel 60 cm wide, 4 cm thick and 14-20 cm thick concrete overtopping on the construction site. The main purpose of the slab tests on a natural scale was to observe the "faulting" effect and temporary deflections. During the tests, the displacements in the area of the panel joints in the middle of the slab span were recorded. The maximum difference in displacement between adjacent panels of the slab model was 0.16 mm, and the vertical displacement was 1.9 mm. The strip model had no cracks that could indicate a interface cracks between the precast element and the concrete overlay. After completion of the field tests, the load was left on the slab model to verify long-term effects.
Źródło:
Civil and Environmental Engineering Reports; 2021, 31, 1; 54-69
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Tests of the Vector II Slab in Field Conditions, Slab and Strip Model
Autorzy:
Zając, Jakub
Drobiec, Łukasz
Jasiński, Radosław
Wieczorek, Mirosław
Kisiołek, Artur
Powiązania:
https://bibliotekanauki.pl/articles/1838085.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
crack pattern
flexural analysis
interface
precast
slab
short-term load
pęknięcia
zginanie
prefabrykaty
płyty
obciążenie krótkotrwałe
Opis:
Vector II slab was tested on a natural scale (a slab with a dimension of 6.30 × 6.30 m) and a strip 6.30 m long and 1.20 m wide. The Vector II slab is built by precast panel 60 cm wide, 4 cm thick and 14-20 cm thick concrete overtopping on the construction site. The main purpose of the slab tests on a natural scale was to observe the "faulting" effect and temporary deflections. During the tests, the displacements in the area of the panel joints in the middle of the slab span were recorded. The maximum difference in displacement between adjacent panels of the slab model was 0.16 mm, and the vertical displacement was 1.9 mm. The strip model had no cracks that could indicate a interface cracks between the precast element and the concrete overlay. After completion of the field tests, the load was left on the slab model to verify long-term effects.
Źródło:
Civil and Environmental Engineering Reports; 2021, 31, 1; 54-69
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of contact pattern for double enveloping worm gear
Autorzy:
Połowniak, Piotr
Sobolak, Mariusz
Marciniec, Adam
Powiązania:
https://bibliotekanauki.pl/articles/1831346.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
globoid worm gear
contact pattern
CAD environment
tooth contact analysis
meshing simulation
globoidalna przekładnia ślimakowa
ślad styku
środowisko CAD
analiza styku zębów
symulacja zazębienia
Opis:
The paper presents the method of determining geometric contact pattern by using the direct computer-aided design (CAD) method for ideal globoid worm gear in which mounting deviations are considered. The tooth contact analysis was performed for all cycle of worm rotation. Based on the results of temporary contact pattern, graphical characteristics of the contact area size depending on worm position were made. A complete analysis of the correctness of gear meshing can be obtained based on presented method. If the worm or worm wheel is incorrectly designed in terms of the geometry, the meshing simulation of CAD models can indicate the collision. Geometric contact pattern analyses were made at two pressure angles of ideal gear. The analysis of the influence of mounting deviations was done against one selected pressure angle and one gear position.
Źródło:
Advances in Manufacturing Science and Technology; 2020, 44, 4; 145-154
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Don’t fight the tape! Technical Analysis Momentum and Contrarian Signals as Common Cognitive Biases
Autorzy:
Zielonka, Piotr
Białaszek, Wojciech
Biedrzycki, Paweł
Dzik, Bartłomiej
Powiązania:
https://bibliotekanauki.pl/articles/1933544.pdf
Data publikacji:
2020-02
Wydawca:
Akademia Leona Koźmińskiego w Warszawie
Tematy:
technical analysis
pattern recognition
cognitive biases
momentum
contrarian
Opis:
Purpose: Stock market participants use technical analysis to seek trends in stock price charts despite its doubtful efficiency. We tested whether technical analysis signals represent typical and common cognitive biases associated with the continuation or reversal of the trend. Methodology: We compared investors’ opinions about the predictive power of technical analysis signals grouped into five conditions: real technical analysis signals associated with trend continuation (real momentum signals) or trend reversal (real contrarian signals), fake momentum or fake contrarian signals, and fluctuation signals. Findings: Investors assigned larger predictive power to real and fake signals associated with trend continuation than to signals associated with trend reversal. Fake signals, which represented cognitive biases, elicited similar predictions about trend continuation or reversal to real technical analysis signals. Originality: Market players assess momentum signals to have greater predictive power than contrarian signals and neutral signals to have the least predictive power. These results are independent of whether technical analysis signals were well-known to investors or made up by experimenters. The hardwired propensity of our brains to detect patterns combined with the non-natural environment of the stock market creates the illusion of expertise that is not easy to dispel.
Źródło:
Central European Management Journal; 2020, 28(2); 98-110
2658-0845
2658-2430
Pojawia się w:
Central European Management Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescent powder technique in electronic speckle pattern photography
Zastosowanie proszków luminescencyjnych w cyfrowej fotografii plamkowej
Autorzy:
Kułak, J.
Suprynowicz, K.
Pisarek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1203881.pdf
Data publikacji:
2019
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
metrologia plamkowa
speckle elektroniczne
fotografia plamkowa w świetle białym
eksperymentalna analiza odkształceń
analiza obrazów plamkowych
technika proszkowa
proszki luminescencyjne
speckle metrology
elektronic speckle
ESPI
white light speckle photography
experimental strain analysis
analize of speckle pattern
speckle pattern
luminescent powder
Opis:
For the generation of speckle images, a luminescent powder applied in a small amount to the sample surface and stimulated by UV radiation was used. We obtained fine-grained speckle patterns with very high contrast and small size of spots, The shape of the single speckle, unlike laser method, is circular, which is important for the effectiveness of the used digital image analysis methods. The measurements of displacements and deformations were made by use of digital image registration and its analysis using correlation procedures. The results are presented in the form of bitmaps, tables and graphs. The developed method was tested on flat wood specimens subjected to three-point bending.
Do generacji obrazów plamkowych wykorzystano proszek luminescencyjny naniesiony w niewielkiej ilości na powierzchnię próbki i pobudzany do świecenia promieniowaniem UV. Uzyskano drobnoziarniste struktury plamkowe (speckle pattern) o bardzo wysokim kontraście i małym rozmiarze plamek, których kształt w przeciwieństwie do speckli laserowych jest kołowy, co ma istotne znaczenie dla skuteczności zastosowanych metod cyfrowej analizy obrazu. Pomiaru przemieszczeń i odkształceń dokonano poprzez cyfrową rejestrację obrazu i jego analizę przy użyciu procedur korelacyjnych. Wyniki zostały przedstawione poglądowo w postaci bitmap oraz w sposób bezpośredni w postaci tablic i wykresów. Opracowana metoda badawcza została przetestowana na płaskich próbkach drewnianych poddanych zginaniu trójpunktowemu.
Źródło:
Physics for Economy; 2019, 3, 1; 15-28
2544-7742
2544-7750
Pojawia się w:
Physics for Economy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The intramontane Orava Basin - evidence of large-scale Miocene to Quaternary sinistral wrenching in the Alpine-Carpathian-Pannonian area
Autorzy:
Ludwiniak, Mirosław
Śmigielski, Michał
Kowalczyk, Sebastian
Łoziński, Maciej
Czarniecka, Urszula
Lewińska, Lena
Powiązania:
https://bibliotekanauki.pl/articles/138722.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Orava Basin
Central Carpathian Palaeogene Basin
structural analysis
strike-slip related basin
transrotational basin
joint pattern analysis
Western Carpathians
Kotlina Orawska
paleogeński basen centralno-karpacki
paleogeńskiego basen Karpat centralnych
analiza strukturalna
basen przesuwczy
basen transrotacyjny
Karpaty Zachodnie
Opis:
The Carpathian Orava Basin is a tectonic structure filled with Neogene and Quaternary deposits superimposed on the collision zone between the ALCAPA and European plates. Tectonic features of the south-eastern margin of the Orava Basin and the adjoining part of the fore-arc Central Carpathian Palaeogene Basin were studied. Field observations of mesoscopic structures, analyses of digital elevation models and geological maps, supplemented with electrical resistivity tomography surveys were performed. Particular attention was paid to joint network analysis. The NE-SW-trending Krowiarki and Hruštinka-Biela Orava sinistral fault zones were recognized as key tectonic features that influenced the Orava Basin development. They constitute the north-eastern part of a larger Mur-Mürz-Žilina fault system that separates the Western Carpathians from the Eastern Alps. The interaction of these sinistral fault zones with the older tectonic structures of the collision zone caused the initiation and further development of the Orava Basin as a strike-slip-related basin. The Krowiarki Fault Zone subdivides areas with a different deformation pattern within the sediments of the Central Carpathian Palaeogene Basin and was active at least from the time of cessation of its sedimentation in the early Miocene. Comparison of structural data with the recent tectonic stress field, earthquake focal mechanisms and GPS measurements allows us to conclude that the Krowiarki Fault Zone shows a stable general pattern of tectonic activity for more than the last 20 myr and is presently still active.
Źródło:
Acta Geologica Polonica; 2019, 69, 3; 339-386
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Building an ontology for system analysis
Autorzy:
Burov, Y.
Pasichnyk, A.
Katrenko, V.
Powiązania:
https://bibliotekanauki.pl/articles/411235.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
system analysis
ontology
pattern
model
concept
semantic grid
Opis:
System analysis as scientific and engineering discipline underpins research and development in other areas. However, system analysis models and methods are often taught separately and, as a result, system analyst cannot form a holistic understanding of this area. In order to deepen our understanding of system analysis’ concepts and relations the ontology of this area was built. It was constructed based on models and methods of system analysis considered as knowledge patterns. The concept of system was selected as a central concept of ontology. Other important concepts, such as goal, function, decision and process are relating to it. Finally, the applications of created system analysis ontology for teaching system analysis in high school and as a part of semantic grid are discussed.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 3; 3-6
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Closest paths in graph drawings under an elastic metric
Autorzy:
Baran, M.
Powiązania:
https://bibliotekanauki.pl/articles/330666.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
elastic shape analysis
pattern recognition
superpixel segmentation
analiza kształtu
rozpoznawanie wzorca
segmentacja obrazu
superpiksel
Opis:
This work extends the dynamic programming approach to calculation of an elastic metric between two curves to finding paths in pairs of graph drawings that are closest under this metric. The new algorithm effectively solves this problem when all paths between two given nodes in one of these graphs have the same length. It is then applied to the problem of pattern recognition constrained by a superpixel segmentation. Segmentations of test images, obtained without statistical modeling given two shape endpoints, have good accuracy.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2018, 28, 2; 387-397
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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