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Wyszukujesz frazę "surface comparison" wg kryterium: Wszystkie pola


Tytuł:
The effect of patterns on image-based modelling of texture-less objects
Autorzy:
Hafeez, J.
Jeon, H.-J.
Hamacher, A.
Kwon, S.-C.
Lee, S.-H.
Powiązania:
https://bibliotekanauki.pl/articles/221814.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
structure-from-motion
feature detection
patterns analysis
3D reconstruction
surface comparison
Opis:
The task of generating fast and accurate three-dimensional (3D) models of objects or scenes through a sequence of non-calibrated images is an active field of research. The recent development in algorithm optimization has resulted in many automatic solutions that can provide an accurate 3D model from texture-full objects. Structure-from-motion (SfM) is an image-based method that uses discriminative point-based feature identifier, such as SIFT, to locate feature points in the images. This method faces difficulties when presented with the objects made of homogenous or texture-less surfaces. To reconstruct such surfaces a well-known technique is to apply an artificial variety by covering the surface with a random texture pattern prior to the image capturing process. In this work, we designed three series of image patterns which are tested based on the contrast and density ratio which increases from the first to the last pattern within the same series. The performance of the patterns is evaluated by reconstructing the surface of a texture-less object and comparing it with the true data. Using the best-found patterns from the experiments, a 3D model of a Moai statue is reconstructed. The experimental results demonstrate that the density and structure of a pattern highly affects the quality of the reconstruction.
Źródło:
Metrology and Measurement Systems; 2018, 25, 4; 755-767
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Response Surface Methodology revisited – comparison of analytical and non-parametric approaches
Autorzy:
Osocha, P.
Powiązania:
https://bibliotekanauki.pl/articles/112084.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
expert system
design of experiment
factorials
Taguchi robust design
RSM
system ekspercki
projektowanie eksperymentu
metodologia powierzchni odpowiedzi
metoda Taguchi
Opis:
Since G.E.P. Box introduced central composite designs in early fifties of 20th century, the classic design of experiments (DoE) utilizes response surface models (RSM), however usually limited to the simple form of low-degree polynomials. In the case of small size datasets, the conformity with the normal distribution has very weak reliability and it leads to very uncertain assessment of a parameter statistical significance. The bootstrap approach appears to be better solution than – theoretically proved but only asymptotically equal – t distribution based evaluation. The authors presents the comparison of the RSM model evaluated by a classic method and bootstrap approach.
Źródło:
Production Engineering Archives; 2018, 20; 49-53
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obliczenia flatteru prostokątnego płata ze sterem za pomocą MSC NASTRAN, ZONA ZAERO i ANSYS/Fluent - porównanie z wynikami badań w tunelu aerodynamicznym
MSC NASTRAN, ZONA ZAERO and ANSYS/Fluent flutter computation of rectangular wing with control surface - comparison with wind tunnel flutter tests results
Autorzy:
Chajec, W.
Dziubiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/213584.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
obliczenia flatteru
obliczenia w dziedzinie częstości
obliczenia w dziedzinie czasu
badanie w tunelu aerodynamicznym
aerodynamic flutter calculation
calculations in frequency domain
calculation in time domain
wind tunel tests
Opis:
Do oceny właściwości aeroelastycznych obiektów latających powszechnie wykorzystywane są analizy obliczeniowe w dziedzinie częstości. W niniejszej pracy do sprawdzenia wiarygodności takich obliczeń wykorzystano wyniki badań prostego obiektu (skrzydła ze sterem) przeprowadzonych przed kilku laty w tunelu Instytutu Lotnictwa. W tym celu zbudowano model obliczeniowy badanego obiektu w systemie MSC Nastran. Spośród wielu wyników, do obecnych porównań wybrano najciekawszą konfigurację, dla której w tunelu występował flatter przy prędkości 17,7 m/s, natomiast w obliczeniach w systemie MSC Nastran flatteru nie wykryto. Dla tych danych za pomocą MSC Nastran wykonano metodą PK obliczenia flatteru z wykorzystaniem modeli aerodynamicznych Doublet Lattice i pasowego. Obliczenia flatteru wykonano także za pomocą dwu wersji programu ZAERO firmy ZONA: z marca 2005 r. i z sierpnia 2011 r. We wszystkich przypadkach, do uzyskania w obliczeniach zmierzonej prędkości krytycznej flatteru była konieczna korekta modelu aerodynamicznego. Zastosowano korektę sił aerodynamicznych za pomocą współczynników WTFACT oraz poprzez zmianę zadanego do obliczeń podziału skrzydło/ster. Ten drugi sposób okazał się bardziej skuteczny. Do uzyskania zgodności wyników obliczeń z eksperymentem najmniejszej korekty wymagało zastosowanie nowego programu ZAERO, nieco większej – MSC Nastranu a największej – starszej wersji programu ZAERO. Dla porównania podano także wyniki analiz flatteru tego samego obiektu i tej samej jego reprezentacji modalnej, wykonane w dziedzinie czasu za pomocą systemu ANSYS/Fluent.
A computational analysis in time domain are commonly used for the aeroelastic properties evaluation. In this paper, the credibility of this analysis is proven, based on wind tunnel flutter tests of a simple object – a wing with control surface - provided a few years ago. For this purpose the MSC Nastran computational model was prepared. In order to make the comparison and to obtain a more detailed analysis in time domain, the most interesting test object configuration was selected. For this configuration, on one hand, in the wind tunnel flutter occurs at 17,7 m/s, but on the other hand, by the MSC Nastran typical aerodynamic flutter computation no flutter was detected. For this model the flutter computation using MSC Nastran with PK method and Doublet Lattice a well as strip aerodynamic models, and two versions: March 2005 and August 2011 of the ZAERO software of ZONA Technologies, Inc. were provided. In each case, an aerodynamic model correction for the consistency with test results was necessary. The correction by WTFACT factors or by, for computation done, wing/control surface dividing line change was used. The second idea turned out to be more effective. In order to get good consistency, the new ZAERO software needs the smallest correction of dividing line localization, MSC Nastran needs a middle correction and the old ZAERO software needs the greatest correction. However, in the case of using in MSC Nastran the strip aerodynamic theory, the good consistency appeared. For comparison, there are also presented flutter analyses in time domain concerning the same object, and the same its modal representation, but using ANSYS/Fluent system.
Źródło:
Prace Instytutu Lotnictwa; 2016, 2 (243); 53-72
0509-6669
2300-5408
Pojawia się w:
Prace Instytutu Lotnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of surface soil moisture from SMOS satellite and ground measurements
Autorzy:
Usowicz, B.
Marczewski, W.
Usowicz, J.B.
Lukowski, M.I.
Lipiec, J.
Powiązania:
https://bibliotekanauki.pl/articles/25959.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
comparison
soil surface
soil moisture
SMOS satellite
ground
measurement
correlation coefficient
Opis:
Soil moisture datasets at various scales are needed for sustainable land use and water management. The aim of this study was to compare soil moisture ocean salinity satellite and in situ soil moisture data for the Podlasie and Polesie regions in Eastern Poland. Both regions have similar climatic and topo- graphic conditions but are different in land use, vegetation, and soil cover. The test sites were located on agricultural fields on sandy soils and natural vegetation on marshy soils that prevail in the Podlasie and Polesie regions, respectively. The soil moisture ocean salinity soil moisture data were obtained from radiometric measurements (1.4 GHz) and the ground soil moisture from sensors at a depth of 5 cm during the years 2010-2011. In general, temporal patterns of soil moisture from both satellite and ground measurements followed the rainfall trend. The regression coeffi- cients, Bland-Altman analysis, concordance correlation coefficient, and total deviation index showed that the agreement between ground and soil moisture ocean salinity derived soil moisture data is better for the Podlasie than the Polesie region. The lower agre- ement in Polesie was attributed mostly to the presence of the widespread natural vegetation on the wetter marsh soil along with minor contribution of agriculturally used drier coarse-textured soils.
Źródło:
International Agrophysics; 2014, 28, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison between surface and volumetric properties of short-chain alcohols and some classical surfactants
Autorzy:
Bielawska, Magdalena
Zdziennicka, Anna
Jańczuk, Bronisław
Powiązania:
https://bibliotekanauki.pl/articles/764079.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
alcohols, surfactants, micelles, aggregates, CMC
Opis:
Measurements of the dynamic surface tension of the aqueous solutions of methanol, ethanol, propanol, CTAB and SDDS at their given concentrations were made. From the obtained results and the literature data it was concluded that the adsorption of short-chain alcohols at the water-air interface is somewhat similar to that of classical surfactants. For that reason the relationship between the Gibbs standard free energy of adsorption of short-chain alcohols and classical surfactants at that interface was established. The correlation between the chemical potential of mixing of alcohols and surfactants was also analysed. This analysis concerned the critical aggregation concentration (CAC) of alcohols and the critical micelle concentration (CMC) of surfactants. The chemical potential of surfactant mixing was calculated from the literature CMC data for the homologous series of alkyl sulfates, alkyl sulfonates, alkyl ammonium chlorides, alkyl trimethylammonium bromides, and alkyl pyridinium bromides. The influence of the hydrophobic chain length of alcohol and surfactant molecules on the Gibbs standard free energy of their adsorption at the water-air interface and their chemical potential of mixing were considered. It appeared that there is a linear dependence between these thermodynamic functions and the number of carbon atoms increased by 1 in the hydrocarbon chains of these compounds. This confirms clearly our conclusion that the behaviour of short-chain alcohols and classical surfactants at the water-air interface and in the bulk phase of aqueous solutions is similar. 
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of surface properties of anthracite coals before and after high temperature heating process
Autorzy:
Xia, W.
Xie, G.
Powiązania:
https://bibliotekanauki.pl/articles/951846.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
heating
coal hydrophobicity
XPS
SEM
BET
contact angle
Opis:
Surface property plays a very important role on coal hydrophobicity which determines flotation behavior of fine coals. However, coal spontaneous combustion makes coal suffer both oxidation and high temperature heating processes. Coals from the outside of coal piles primarily suffer oxidation (or combustion process) while coals from the inside of coal piles primarily suffer high temperature heating process. It is necessary to investigate the changes in surface properties of coal before and after high temperature heating process. In this investigation, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), surface area (BET) and contact angle measurements were used to indicate the changes in surface properties of anthracite coal before and after high temperature heating process. Throughout this study, surface properties of coal changed significantly after high temperature heating process. Meanwhile, coal hydrophobicity can be also reduced after high temperature heating.
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 1; 205-212
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of comparison of surface texture based on fractal dimension and Hotelling’s T2 test
Autorzy:
Gogolewski, Damian
Powiązania:
https://bibliotekanauki.pl/articles/99764.pdf
Data publikacji:
2019
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
face milling
fractal dimension
surface roughness
test
Opis:
Comparative analysis of the surface texture of machine parts can be successfully carried out using statistical tests. The paper presents a methodology of method used to compare the surface texture by applying Hotelling’s T2 test as well as a method used to evaluate surface topography by applying fractal dimension. The tests were carried out on samples produced with the use of face milling process for four types of materials. The following types of steel were used: 40HM, C45, NC6 and WCL. For each type of material, four areas were machined with the same machining parameters. Based on these results a decision was made whether the surfaces, despite the same machining conditions, were significantly different from each other. Furthermore, the analysis indicated that the fractal dimension enabled to characterise signal irregularities in quantitative and qualitative way.
Źródło:
Journal of Machine Engineering; 2019, 19, 4; 82-90
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of surface textures produced by finish cutting, abrasive and burnishing operations in terms of their functional properties
Autorzy:
Grzesik, W.
Żak, K.
Powiązania:
https://bibliotekanauki.pl/articles/100216.pdf
Data publikacji:
2013
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
hard turning
burnishing
superfinish
surface texture
functional properties
Opis:
The purpose of this research is to asses the functionality of surfaces produced by CBN hard turning, ball burnishing and superfinishing for improving the surface finish of parts made of high-strength, low alloy 41Cr4 steel with a hardness of about 57 HRC. Machined surfaces were characterized usin 3D scanning techniques. A set of 3D roughness parameters and real 3D surface topographies produced by the above-mentioned machining operations were estimated and determined.This investigation confirms that sequential processes based on initial CBN hard turning allows producing surfaces with better service properties.The main conclusion is that this sequential technology can partly eliminate grinding operations when hard machining is not enough to produce the desired surface finish.
Źródło:
Journal of Machine Engineering; 2013, 13, 2; 46-58
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Powierzchnia właściwa proszków, porównanie wyników policzonych i zmierzonych metodami przepływowymi i adsorpcyjnymi
Specific surface of powders, comparison of calculated and measured by flowing and adsorptive methods results
Autorzy:
Kordek, J.
Gawenda, T.
Kępys, W.
Powiązania:
https://bibliotekanauki.pl/articles/350136.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
powierzchnia właściwa
skład ziarnowy
specific surface
grain composition
Opis:
Dla kilku proszków pochodzenia mineralnego wykonano precyzyjne oznaczenia składu ziarnowego i powierzchni właściwej. Składy oznaczono dwiema metodami laserowymi, a powierzchnię właściwą metodą przepływową Blaine'a i metodą adsorpcyjną BET. Zestawienie tak otrzymanych wyników pozwala na sformułowanie opinii o terminie "powierzchnia właściwa" ze względu na zupełnie różne podejście do otrzymanych wyników i ich różnych istotnie wartości. Wykonanie równoległych pomiarów potwierdza, że przeznaczone do różnych celów oznaczenia fizykochemiczne i obliczeniowe mogą być porównywalne przy zastosowaniu stosownych zaproponowanych reguł.
For some powders of mineral origin, the precise grain composition and specific surface determination was done. The compositions were determined by two laser methods and specific surface by Blaine's flowing method of and adsorptive method BET. The juxtaposition of results given in such way allow to formulate an opinion about the term "specific surface" because of totally different approach to results and their significantly different values. The conducting of parallel measurements confirms that physical and chemical, as well calculating determinations spare to various purposes may be comparable when the right proposed rules are applied.
Źródło:
Górnictwo i Geoinżynieria; 2006, 30, 3/1; 147-154
1732-6702
Pojawia się w:
Górnictwo i Geoinżynieria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of body surface area-based and weight-based dosing format for oral prednisolone administration in small and large-breed dogs
Autorzy:
Nam, A.
Kim, S.M.
Jeong, J.W.
Song, K.H.
Koo, T.S.
Seo, K.W.
Powiązania:
https://bibliotekanauki.pl/articles/2087897.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Polish Journal of Veterinary Sciences; 2017, 3; 611-613
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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