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Wyświetlanie 1-15 z 127
Tytuł:
Recognizing Sharp Features of 2-D Shapes
Autorzy:
Gewali, L.
Scanlan, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/226950.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
shape recognition
shape similarity
boundary approximation
shape decomposition
shape simplification
Opis:
We present an efficient algorithm for recognizing and extracting sharp-features from complex polygonal shapes. The algorithm executes in O(n²) time, where n is the number of vertices in the polygon. Sharp-feature extraction algorithms can be useful as a pre-processing step for measuring shape-similarity between polygonal shapes.
Źródło:
International Journal of Electronics and Telecommunications; 2010, 56, 2; 153-156
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on thermo-mechanical behavior of shape memory alloy actuator
Autorzy:
Kurzawa, M.
Stachowiak, D.
Powiązania:
https://bibliotekanauki.pl/articles/140853.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
shape memory alloys
linear actuator
hysteresis
SMA wire
Opis:
The paper presents the design procedure and elaborated software for designing calculation of the shape memory alloy (SMA) actuator. The thermo-mechanical behavior of a linear SMA actuator has been studied. The experimental set-up was especially designed to perform the thermo-mechanical characterization of SMA wires. The stroke (s) – temperature (T) hysteresis characteristics have been determined. The cycle of heating and cooling has been performed under a constant load. The model for the SMA actuator s – T behavior has been proposed and successfully implemented. The selected results and conclusions have been presented. The concept proposal of the linear actuator using the SMA wire has been given.
Źródło:
Archives of Electrical Engineering; 2017, 66, 4; 751-760
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shape Independent Coding Using NURBS and Bézier Approximation and Interpolation Curves
Autorzy:
Ondrušová, S.
Polec, J.
Powiązania:
https://bibliotekanauki.pl/articles/227081.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NURBS
Bezier
image compression
segmentation
shape independent transform
Opis:
In this paper a scheme of utilizing shape independent basis functions for the hierarchical multiresolution image compression is shown. For a given image texture region segmentation method is used. Following polygonal approximation of created segments causes a degradation of their boundaries. Using NURBS and Bezier interpolation and approximation segments' boundaries are created, thus achieving an image mask. As an input of the three-level hierarchical encoder this image mask and image are used. The image mask and image are subsampled by a factor of 2 on each level. The hierarchical encoder encodes them shape independently. Especially for a very low bit rate image coding gives better results for objective criteria (PSNR). For segment approximation the 2D shape independent orthogonal transform (DCT II) is used. Splines encoding and decoding is very efficient, because only their control points need to be stored. The segment is coded with a modified code similar to the JPEG code.
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 4; 443-446
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new method of line feature generalization based on shape characteristic analysis
Autorzy:
Huang, Z.
Nie, H.
Powiązania:
https://bibliotekanauki.pl/articles/220575.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
line generalization
key point detection
shape characteristic analysis
Opis:
This paper presents a piecewise line generalization algorithm (PG) based on shape characteristic analysis. An adaptive threshold algorithm is used to detect all corners, from which key points are selected. The line is divided into some segments by the key points and generalized piecewise with the Li-Openshaw algorithm. To analyze the performance, line features with different complexity are used. The experimental results compared with the DP algorithm and the Li-Openshaw algorithm show that the PG has better performance in keeping the shape characteristic with higher position accuracy.
Źródło:
Metrology and Measurement Systems; 2011, 18, 4; 597-605
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of Reinforcement Phase Shape in MMC Using Decision Trees
Autorzy:
Gawdzińska, K.
Pelczar, M.
Powiązania:
https://bibliotekanauki.pl/articles/382948.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
shape
reinforcement phase
data mining
decision trees
kształt
faza zbrojenia
drzewa decyzyjne
Opis:
This paper proposes a description of the reinforcement phase shape in MMCs by means of a decision, or classification tree analysis, recognized as a basic data mining technique. The material under examination was composed of reinforcement particles (SiC) in suspension composites with silumin matrix, made by mechanical stirring method. The use of decision tree method allowed to determine logic rules for the classification of particles to the category circle on the basis of its diameter and surface area, taking into account the division into three samples (depending on the location of the analyzed area in the casting space) and a reference sample (representative analysis area – of most desired shape in terms of composite quality - generated by simulation). To assess the accuracy of classification we used a redistribution indicator, that can be a measure used in describing the feature: homogeneity of reinforcement phase particle shape in the space of composite casting.
Źródło:
Archives of Foundry Engineering; 2013, 13, 2 spec.; 39-42
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Behavior of Amorphous-Nanocrystalline Ni50Ti50 Shape Memory Alloy
Autorzy:
Aghabeygzadeh, H.
Mohammad Sharifi, E.
Tavoosi, M.
Powiązania:
https://bibliotekanauki.pl/articles/2049440.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NiTi
shape memory alloy
amorphous
nanocrystalline
corrosion
Opis:
In the present study, the corrosion behaviors of amorphous-nanocrystalline Ni50Ti50 shape memory alloy with different crystallite sizes were investigated. The Ni50Ti50 homogenized specimens were hot rolled and annealed at 950°C. Thereafter, the nanocrystalline Ni50Ti50 specimens with different crystalline sizes in the range of 40-350 nm were prepared by cold rolling and annealing at temperature range of 400 to 900°C. The corrosion resistance of Ni50Ti50 specimen with coarse grain size has significantly increased after cold rolling as a result of the formation of amorphous-nanocrystalline structure. The amorphous and nanocrystalline (with the crystallite size of about 40 nm) Ni50Ti50 samples exhibited the best corrosion resistance in the 5% HCl electrolyte with the corrosion potential and corrosion current density of about –197 mV and 2.34×10-6 A/cm2, respectively. This effect can be attributed to the higher density of crystalline defects in amorphous and nanocrystalline structures to quickly form protective films on the surface.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 1; 267-272
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Band Notch Characteristics Reconfigurable UWB Leaf Shape Monopole Antenna
Autorzy:
Muthusamy, Pachiyaannan
Nallapaneni, Srikanta
Perumalla, Krishna Chaitanya
Punna, Bharghava
Powiązania:
https://bibliotekanauki.pl/articles/2055232.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
band notch
PIN diode
leaf shape monopole antenna
reconfigurable
UWB
Opis:
In this paper a band notch characteristics reconfigurable UWB leaf shape monopole antenna is reported. The proposed antenna size is 42×32×1.6 mm³ and simulated S11-10dB impedance bandwidth is from 2.1 to 13.0 GHz. The notch bands are embodied into the designed antenna to suppress Bluetooth and WiFi bands from 2.3-2.7 GHz and 4.6-5.3 GHz. The PIN Diode is loaded to slot on the DGS to achieve notch bands. It has 4.48dB and 1.7dB gain achieved when diode ON and OFF condition. Further, it encompasses a bio-inspired leaf shape patch having high feasibility for deployment in secret and military purposes.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 2; 223--228
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of Die Shape and Back Tension Force on its Wear in the Process of Wire Drawing
Autorzy:
Nowotyńska, I.
Kut, S.
Powiązania:
https://bibliotekanauki.pl/articles/352252.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
drawing
die shape
wear
copper wire
Opis:
In the paper an analysis of the influence of two parameters on the die wear, i.e. the shape of the die and the backpull with the specified force values has been presented. The conical and curve-profile tools have been selected to determine an influence of the die geometry on its wear, and the backpull force has been tested with the use of conical dies. The research was conducted for the drawing of copper wire by sintered carbide die with a mesh diameter of 3 mm. A fixed draw value of 30% relative gap loss was assumed. The axisymmetric numerical model of the drawing process was built and modeled in the MARC/Mentat commercial program for nonlinear and contact issues. As a result of the tests, wear of the dies according to their shape was determined. In addition, for the conical die the drawing force and the force of the metal pressure on the die using different values of the force of the contraction were calculated, as well as wear of the conical die according to the value of the applied backpull force. It has been shown that in the case of the arc die, the distribution of pressure and stress is more uniform over the entire length of the contact zone compared to the conical die. The highest stress gradients occurred in the area of the transition of the crushing part into the drawing part of the die, which caused that the use of the conical die in this area was more than twice as large as the arc die. In addition, on the example of a conical die, it was shown to what extent the depth of its wear decreases with an increase of the test pull force in the range (0-400) of Newtons.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1131-1137
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Graphite Shape in Cast Iron Obtaining by Inmold Process
Autorzy:
Gumienny, G.
Kurowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/381705.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
theory of crystallization
inmold process
graphite shape
teoria krystalizacji
technologia inmold
żeliwo sferoidalne
Opis:
The paper presents results of research on the effect of magnesium on the graphite shape in cast iron obtained by Inmold process. For testing Lamet® 5504 master alloy was used. The crystallization process of cast iron with various Mg concentrations was evaluated with use of the thermal and derivative analysis (TDA) method. The conditions were demonstrated for which a flake, vermicular and nodular graphite were obtained. Values of graphite “c” coefficient were analyzed. Results from it the significant differences between the assessment of the graphite on metallographic specimen and by the "c" coefficient. An effect of wall thickness of the casting on the graphite coefficient was indicated.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 15-20
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rapid antenna design optimization using shape-preserving response prediction
Autorzy:
Kozieł, S.
Ogurtsov, S.
Szczepański, S.
Powiązania:
https://bibliotekanauki.pl/articles/201113.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
antenna design
simulation-driven design
antenna optimization
shape-preserving response prediction
coarse-discretization simulation
Opis:
An approach to rapid optimization of antennas using the shape-preserving response-prediction (SPRP) technique and coarsediscretization electromagnetic (EM) simulations (as a low-fidelity model) is presented. SPRP allows us to estimate the response of the high-fidelity EM antenna model, e.g., its reflection coefficient versus frequency, using the properly selected set of so-called characteristic points of the low-fidelity model response. The low-fidelity model, corrected by means of SPRP, is subsequently used to predict the optimal design. The design process is cost efficient because most operations are performed on the low-fidelity model. Performance of our technique is demonstrated using a dielectric resonator antenna and two planar wideband antenna examples. In all cases, the optimal design is obtained at a cost corresponding to a few high-fidelity simulations of the antenna under design.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 143-149
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Shape Memory Characteristics of Highly Porous Ti-Nb-Mo Biomaterials
Autorzy:
Kim, Y.-W.
Mukarati, T. W.
Powiązania:
https://bibliotekanauki.pl/articles/351933.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ti-Nb-Mo alloys
porous scaffolds
biomedical materials
shape memory alloys
Opis:
Non-toxic Ti-Nb-Mo scaffolds were fabricated by sintering rapidly solidified alloy fibers for biomedical applications. Microstructure and martensitic transformation behaviors of the porous scaffolds were investigated by means of differential scanning calorimetric and X-ray diffraction. The α″ – β transformation occurs in the as-solidified fiber and the sintered scaffolds. According to the compressive test of the sintered scaffolds with 75% porosity, they exhibit good superelasticity and strain recovery ascribed to the stress-induced martensitic transformation and the shape memory effect. Because of the high porosity of the scaffolds, an elastic modulus of 1.4 GPa, which matches well with that of cancellous bone, could be obtained. The austenite transformation finishing temperature of 77Ti-18Nb-5Mo alloy scaffolds is 5.1°C which is well below the human body temperature, and then all mechanical properties and shape memory effect of the porous 77Ti-18Nb-5Mo scaffolds are applicable for bon replacement implants.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1367-1370
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selection of optical to mography parameters for gas bubble shape analysis
Autorzy:
Rząsa, M.R.
Powiązania:
https://bibliotekanauki.pl/articles/185491.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bubble shape
gas flow
optical
tomography
two-phase measurement
kształt bańki
przepływ gazu
tomografia
pomiar dwufazowy
Opis:
An optical tomograph in which a tested object is illuminated from five directions has been presented in the paper. The measurements of luminous intensity after changing into discrete signals (0 or 1) in the detectors equipped with 64 optical sensors were subjected to reconstruction by means of the matrix algorithm. Detailed description of the measuring sensor, as well as the principles of operation of the electronic system, has been given in the paper. Optical phenomena occurring at the phase boundary while transmitted through the sensor wall and phenomena inside the measuring space have also been taken into account. The method of the sensor calibration has been analysed and a way of technical solution of the problem under consideration has been discussed. The elaborated method has been tested using objects of the known shape and dimensions. It was found that reconstruction of the shapes of moving bubbles and determination of their main parameters is also possible with a reasonable accuracy.
Źródło:
Chemical and Process Engineering; 2014, 35, 1; 19-33
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CAD models clustering with machine learning
Autorzy:
Machalica, Dawid
Matyjewski, Marek
Powiązania:
https://bibliotekanauki.pl/articles/139503.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
3D shape matching
3D shape retrieval
3D model recognition
3D shape
content-based retrieval
machine learning
dopasowanie kształtu 3D
pobieranie kształtu 3D
rozpoznawanie modeli 3D
kształt 3D
pobieranie oparte na treści
uczenie maszynowe
Opis:
Similarity assessment between 3D models is an important problem in many fields including medicine, biology and industry. As there is no direct method to compare 3D geometries, different model representations (shape signatures) are developed to enable shape description, indexing and clustering. Even though some of those descriptors proved to achieve high classification precision, their application is often limited. In this work, a different approach to similarity assessment of 3D CAD models was presented. Instead of focusing on one specific shape signature, 45 easy-to-extract shape signatures were considered simultaneously. The vector of those features constituted an input for 3 machine learning algorithms: the random forest classifier, the support vector classifier and the fully connected neural network. The usefulness of the proposed approach was evaluated with a dataset consisting of over 1600 CAD models belonging to 9 separate classes. Different values of hyperparameters, as well as neural network configurations, were considered. Retrieval accuracy exceeding 99% was achieved on the test dataset.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 2; 133-152
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insight into a shape of salt storage caverns
Autorzy:
Cyran, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/218820.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
złoża soli kamiennej
kawerna solna
utylizacja odpadów przemysłowych
underground storage in rock salt deposit
geological feature
shape of salt caverns
irregularities
Opis:
Salt caverns are used for over 70 years to store power sources and dispose of industrial wastes. The design of cavern shape and dimensions is still considered as a difficult engineering problem despite progress in geotechnical, construction and exploration methods. The rational design of cavern depends on mechanical parameters of rock salt and nonsalt rocks, stability conditions, safety requirements and stored material. However, most of these factors are related to geological factors like depth of cavern location, the geological structure of salt deposit, lithology of interlayers, petrology and mineralogy of rock salt and interlayers. The significant diversity in the geological conditions of different rock salt deposits contributed to the variety in shape and dimensions of salt caverns worldwide. In this paper, the examples of caverns developed in various salt deposits are presented. The shape of these caverns and its relation to geological features is presented. The influence of geological factors on the formation of irregularities in a cavern shape is described. Moreover, the evaluation of storage caverns located in Polish salt deposits in a view of the aforementioned geological factors is performed. The information and analysis described in this paper provide input which can be useful in future plans connected with the development of underground storage in Poland.
Źródło:
Archives of Mining Sciences; 2020, 65, 2; 363-398
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On Bending Creep Behaviour of a Powder Metallurgy FeMnSiCrNi Shape Memory Alloy
Autorzy:
Ciurcă, Lenuța
Pricop, Bogdan
Agop, Maricel
Bujoreanu, Leandru-Gheorghe
Powiązania:
https://bibliotekanauki.pl/articles/2125532.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FeMnSiCrNi shape memory alloy
bending creep
creep rate
multifractal model
Opis:
FeMnSiCrNi alloys represent a promising class of FeMnSi-based shape memory alloys (SMAs) characterized by excellent characteristics of formability and corrosion resistance. The present paper is focused on a 68Fe-18Mn-3Si-7Cr-4Ni (mass. %) SMA, produced by powder metallurgy routine, which was tested to creep, using a dual cantilever specimen holder, and analyzed by means of the dedicated software of a dynamic mechanical analyzer. The specimens were tested at five temperatures by applying, at each of them, four bending force values, during 2000 s. The variation of bending creep deflection with time, temperature and force was discussed both from the point of instant value and 1000 s-value. These results enabled plotting a space diagram of stabilized creep rate variation with both applied force and test temperature. In such context, a theoretical model in a multifractal paradigm of motion was built, considering that FeMnSiCrNi shape memory alloy can be assimilated, both structurally and functionally, with a multifractal object. Finally, this model was validated by means of experimental data.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 901--908
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 127

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