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Wyświetlanie 1-15 z 83
Tytuł:
Experimental data driven robot for pattern classification
Autorzy:
Sapiecha, Krzysztof
Łukawska, Barbara
Paduch, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/764569.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Źródło:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica; 2005, 3, 1
1732-1360
2083-3628
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska. Sectio AI, Informatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A framework for the reliability characteristics estimation on the experimental data
Autorzy:
Borowczyk, H.
Lindstedt, P.
Manerowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/242525.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
reliability
experimental data
framework
expert system
Opis:
This paper presents a framework for the reliability characteristics estimation on the experimental data. The framework consists of the set of failures, the experimental data sources, the set of reliability characteristics, the estimation methods, the estimation goodness tests and the expert system supporting estimation and statistical inference processes. The experimental data was obtained with two main theoretical means: control theory and diagnostics. It has been observed that changes of the functioning condition potential could serve to determine the symptoms of transient (momentary) failures and the changes in the potential of the technical condition to determine the symptoms of parametric faults. Such an information is sufficient to calculate reliability characteristics before dangerous catastrophic failures occur and to calculate reliability characteristics for single object without having to deal with a numerous set of objects. The set of reliability characteristics models consists of the analysed failures combination and distribution functions used in the reliability engineering. The set of estimation methods includes analytical and numerical ones. The proposed expert system supporting estimation and statistical inference processes consists of data base (the experimental data), rule base and inferring machine.
Źródło:
Journal of KONES; 2016, 23, 3; 57-63
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilation and Modelling of Sands in the Light of Experimental Data
Autorzy:
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/241366.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
sands
dilation
constitutive equations
Opis:
The problem of dilation is discussed in the context of classical Cam-Clay model, which was developed on the basis of a specific assumption regarding the plastic work. This assumption leads to a special form of the dilation function, from which a shape of yield function is derived. The above mentioned assumption is compared with the results of the triaxial tests, performed on the model “Skarpa” sand. It is shown that the Cam-Clay approach is not realistic, as it is based on the assumption which is not consistent with experimental data. Some general considerations and discussion of this problem are also presented.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2014, 61, 1-2; 3-15
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hypoplastic modelling of pre-failure behaviour of sand against experimental data
Autorzy:
Głębowicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/241400.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
hypoplasticity
constitutive equation
sand
deformation
anisotropy
Opis:
The aim of this article is to compare experimentally determined strains of sand with theoretical calculations made on the base of the theory of hypoplasticity. During the study `Skarpa' sand was examined in the triaxial apparatus with local measurement of vertical and lateral strains. Results obtained were used to calibrate 8-parameter von Wolffersdorff model. Subsequently, the behaviour of loose and dense sandy samples subjected to different stress paths was predicted.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2006, 53, 1; 31-47
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling of material behaviour for Inconel 718 superalloy using experimental data
Autorzy:
Nieslony, P.
Grzesik, W.
Laskowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/99822.pdf
Data publikacji:
2017
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
modeling
machining
constitutive model
Opis:
In this paper parameters of the Johnson-Cook (J-C) constitutive material model were predicted more accurately based on the static and dynamic material tests and mathematical modelling of relevant response surfaces using specially developed Matlab scripts. Experimental tests were performed under strain rates of 10-3 and 101 1/s and the temperature ranging from the ambient up to 700°C. As a result, a set of mathematical models which fit the experimental data was determined. The experimentally-derived constitutive models were implemented into FEM-based simulations of real machining processes of Inconel 718.
Źródło:
Journal of Machine Engineering; 2017, 17, 3; 75-84
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Interpretation of the Radarograms on the Basis of Experimental Data
Autorzy:
Zhartybayeva, M.
Oralbekova, Z.
Iskakov, K.
Powiązania:
https://bibliotekanauki.pl/articles/1402517.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.43.fj
73.43.Fj
01.50.hv
Opis:
An algorithm for solving the inverse problem of subsurface radiolocation using data from ground penetrating radar is presented in this paper. Experimental research was carried out using the geophysical device "Loza B" in field conditions; a part of airfield runway, located on the territory of Almaty region (Kazakhstan), was investigated. The conclusion concerning the reasons of occurrence of defects on the surface of the runway is given.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-467-B-468
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Cast Iron Substitute Thermal Capacity Using the Experimental Data
Autorzy:
Majchrzak, E.
Mendakiewicz, J.
Mochnacki, B.
Powiązania:
https://bibliotekanauki.pl/articles/353685.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
modeling of alloys solidification
numerical methods
sensitivity analysis
inverse problems
Opis:
In the paper the problem of the cast iron substitute thermal capacity estimation is discussed. This parameter appears when the macroscopic mathematical model of alloys solidification bases on the one domain method (fixed domain approach). In the case of cast iron the form of function describing the course of temperature-dependent thermal capacity is quite complex. Using the experimental data, in particular the measured cooling, heating curves at the set of points selected in the casting – mould domain the identification problem has been solved using the gradient methods. The results presented concern the gray iron 3.21% C and 1.9% Si.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 307-314
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Parallelized numerical code for derivation of heat transfer coefficient from experimental data
Autorzy:
Telega, J.
Doerffer, P.
Szwaba, R.
Kaczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1938631.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska
Tematy:
Matlab parallel computation
heat transfer coefficient
blade cooling
Opis:
An application of parallel computation capabilities in the MATLAB language for the analysis of experimental data concerning the heat transfer coefficient on ribbed walls is presented in this paper. A description of the experimental study, mathematical model and numerical implementation is also given. The obtained results of measurements and calculations shown here clearly indicate the influence of ribbed walls on the heat transfer coefficient distribution in an internal, subsonic flow.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 197-205
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of non-axisymmetric pulse shaper position on SHPB experimental data
Autorzy:
Panowicz, R.
Janiszewski, J.
Kochanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/280350.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
split Hopkinson pressure bar
pulse shaping technology
high-strain-rate testing
Opis:
The results of experimental and numerical analysis of the influence of the non-axisymmetric pulse shaper position on recorded wave signals in the split Hopkinson pressure bar experiment are presented. The paper focuses attention on the problem of wave signal disturbances caused by a bending wave resulting from non-axisymmetric pulse shaper positions and, moreover, different shaper thickness, striker impact velocities and Wheatstone bridge configurations. The obtained results of analyses indicate that the effect of the non-axisymmetric pulse shaper position may be neglected if deviation from the bar axis does not exceed 20%.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 873-886
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cam-clay approach to modelling pre-failure behaviour of sand against experimental data
Autorzy:
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/240978.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
pre-failure deformations of sand
elastic-plastic model of sand
Cam-Clay type
Opis:
The aim of this paper is to compare pre-failure deformations of sand, obtained from a Cam-clay type elastic-plastic model, with experimental data. The experiments were performed in a modern triaxial apparatus, enabling local measurement of both vertical and lateral strains. The experimental programme is briefly described, then a slightly modified, Cam-clay type, elastic-plastic model of sand is presented. Predictions of this model, for different stress paths, are compared with respective experimental results, then extensive discussion of basic problems connected with elasto-plastic modelling of sand is presented. The aim of the discussion is to display some shortcomings of this type of modelling.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 3; 229-249
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Confronting theoretical predictions with experimental data; A fitting strategy for multi-dimensional distributions
Autorzy:
Przedziński, T.
Roig, P.
Shekhovtsova, O.
Wąs, Z.
Zaremba, J.
Powiązania:
https://bibliotekanauki.pl/articles/305752.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
RChL
TAUOLA
hadronic currents
fitting strategies
multi-dimensional fits
Opis:
After developing a Resonance Chiral Lagrangian (R χ L) model to describe hadronic τ lepton decays, the model was confronted with experimental data. This was accomplished by using a fitting framework that was developed to take into account the complexity of the model and to ensure numerical stability for the algorithms used in the fitting. Since the model used in the fit contained 15 parameters and there were only three one-dimensional distributions available, we could expect multiple local minima or even whole regions of equal potential to appear. Our methods had to thoroughly explore the whole parameter space and ensure (as well as possible) that the result is a global minimum. This paper is focused on the technical aspects of the fitting strategy used. The first approach was based on a re-weighting algorithm published in article Shekhovtsova et al. and produced results in about two weeks. A later approach, with an improved theoretical model and a simple parallelization algorithm based on Inter-Process Communication (IPC) methods of UNIX system, reduced computation time down to 2–3 days. Additional approximations were introduced to the model, decreasing the necessary time to obtain the preliminary results down to 8 hours. This allowed us to better validate the results, leading to a more robust analysis published in article Nugent et al.
Źródło:
Computer Science; 2015, 16 (1); 17-38
1508-2806
2300-7036
Pojawia się w:
Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Particulate organic carbon in the Southern Baltic Sea: numerical simulations and experimental data
Autorzy:
Dzierzbicka-Glowacka, L.
Kulinski, K.
Maciejewska, A.
Jakacki, J.
Pempkowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/48082.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic Sea
Gdansk Deep
calcification
carbon cycle
detritus
nutrient
organic compound
organic matter
particulate organic carbon
photosynthesis
phytoplankton
primary production
sea water
validation
zooplankton
Opis:
Particulate Organic Carbon (POC) is an important component in the carbon cycle of land-locked seas. In this paper, we assess the POC concentration in the Gdańsk Deep, southern Baltic Sea. Our study is based on both a 1D POC Model and current POC concentration measurements. The aim is twofold: (i) validation of simulated concentrations with actual measurements, and (ii) a qualitative assessment of the sources contributing to the POC pool. The POC model consists of six coupled equations: five diffusion-type equations for phytoplankton, zooplankton, pelagic detritus and nutrients (phosphate and total inorganic nitrogen) and one ordinary differential equation for detritus at the bottom. The POC concentration is determined as the sum of phytoplankton, zoo-plankton and pelagic detritus concentrations, all expressed in carbon equivalents. Bacteria are not simulated in this paper. The observed large fluctuations of POC concentrations are attributed to its appreciable seasonal variability. The maximum concentration of POC varied between 870 mgC m−3 in May and 580 mgC m−3 in September, coinciding with the period of maximum dead organic matter and phytoplankton biomass concentrations. The results of the numerical simulations are in good agreement with observed values. The difference between the modelled and observed POC concentrations is equal to 3–28% and depends on the month for which the calculations were made, although no time trend of the difference is observed. The conclusion is that the numerical simulations are a ufficiently good reflection of POC dynamics in the Baltic.
Źródło:
Oceanologia; 2010, 52, 4
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wyznaczanie modeli wielomianowych obiektów z danych eksperymentalnych
Determination of polynomial models from experimental data
Autorzy:
Muciek, A.
Powiązania:
https://bibliotekanauki.pl/articles/156158.pdf
Data publikacji:
2007
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
dopasowanie funkcji do danych
wyznaczanie modeli
wyznaczanie stopnia wielomianu
fitting data to function
polynomial degree determination
model determination: forward selection and backward elimination
Opis:
Przedstawiono metody wyznaczania modeli wielomianowych z danych eksperymentalnych. Zaproponowano algorytm pozwalający na uproszczenie obliczeń i zmniejszenie błędów numerycznych. Opracowano program komputerowy i przeprowadzono badania porównawcze metod przy wykorzystaniu zarówno symulowanych wyników eksperymentu jak i wyników pomiarów rzeczywistych obiektów. Analiza pozwoliła na określenie własności metod.
Methods for polynomial models determination from experimental data are presented. An algorithm that simplifies calculations and decreases numerical errors is proposed. A computer program realizing this method has been prepared and analysis of the method is perfored. Properties of the methods and scope of applications are discussed.
Źródło:
Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 198-201
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical analysis of cavitating flow in Venturi tube on the basis of experimental data
Autorzy:
Niedźwiedzka, A.
Sobieski, W.
Powiązania:
https://bibliotekanauki.pl/articles/298422.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
cavitation
Venturi tube
mass flow rate
Opis:
The content of this article is a direct continuation of the prior experimental works on the topic of cloud cavitation in Venturis. The results of the experimental tests were used to create a set of characteristics for three types of Venturis. The article has two aims: 1) verification of the similarity between the characteristics obtained and reported in the literature, 2) verification of the range of the obtained characteristics with respect to parallel diagrams. Both aims were achieved, which confirms that the quality of the prior results of the experimental measurements is at least sufficient to realize the main objective of the whole project: creation of numerical models of cavitating flow in Venturis. The literature overview showed that the issue has been not solved until today, even at the qualitative level. This reason was the motivation for the undertaken research, including contents of the article.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2016, 19(3); 215-229
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of MOSFETs with crystalline high-k gate-dielectrics: device simulation and experimental data
Autorzy:
Zaunert, F.
Endres, R.
Stefanov, Y.
Schwalke, U.
Powiązania:
https://bibliotekanauki.pl/articles/308785.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
crystalline high-k gate dielectric
rare-earth oxide
praseodymium oxide
gadolinium oxide
damascene metal gate
CMP
CMOS process
TSUPREM4
MEDICI
interface state density
carrier mobility
remote coulomb scattering
Opis:
The evaluation of the world's first MOSFETs with epitaxially-grown rare-earth high-k gate dielectrics is the main issue of this work. Electrical device characterization has been performed on MOSFETs with high-k gate oxides as well as their reference counterparts with silicon dioxide gate dielectric. In addition, by means of technology simulation with TSUPREM4, models of these devices are established. Current-voltage characteristics and parameter extraction on the simulated structures is conducted with the device simulator MEDICI. Measured and simulated device characteristics are presented and the impact of interface state and fixed charge densities is discussed. Device parameters of high-k devices fabricated with standard poly-silicon gate and replacement metal gate process are compared.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 2; 78-85
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 83

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