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Wyświetlanie 1-15 z 23
Tytuł:
Effect of Cooling Rate on the Microstructure and Mechanical Properties of Al-33 wt.% Cu Alloy
Autorzy:
Lee, Yeon-Joo
Kwon, Do-Hun
Cha, Eun-Ji
Song, Yong-Wook
Choi, Hyun Joo
Kim, Hwi-Jun
Powiązania:
https://bibliotekanauki.pl/articles/2203708.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser melting
cooling rate
lamellar spacing
hardness
Al-33wt.%Cu alloy
Opis:
Directed energy deposition (DED) is an additive manufacturing process wherein an energy source is focused on a substrate on which a feedstock material is simultaneously delivered, thereby forming a small melt pool. Melting, solidification, and subsequent cooling occur at high rates with considerable thermal gradients compared with traditional metallurgical processes. Hence, it is important to examine the effects of cooling rates on the microstructures and properties of the additive manufactured materials. In this study, after performing DED with various energy densities, we investigated the changes in the microstructures and Vickers hardness of cast Al-33 wt.% Cu alloy, which is widely used to estimate the cooling rate during processing by measuring the lamellar spacing of the microstructure after solidification. The effects of the energy density on the cooling rate and resultant mechanical properties are discussed, which suggests a simple way to estimate the cooling rate indirectly. This study corresponds to the basic stage of the current study, and will continue to apply DED in the future.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 43--46
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault diagnosis of induction motors rotor using current signature with different signal processing techniques
Autorzy:
Guezam, Abdelhak
Bessedik, Sid Ahmed
Djekidel, Rabah
Powiązania:
https://bibliotekanauki.pl/articles/2096189.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
asynchronous machine
rotor defect
diagnostic
signal processing
FFT
HT
WT
maszyna asynchroniczna
diagnostyka
przetwarzanie sygnałów
Opis:
The popularity of asynchronous machines, particularly squirrel cage machines, stems from their inexpensive production costs, resilience, and low maintenance requirements. Unfortunately, potential flaws in these devices might have a negative impact on the facility's profitability and service quality. As a result, diagnostic tools for detecting flaws in these types of devices must be developed. Asynchronous machine problems can be diagnosed using a variety of methods. Signal processing techniques based on extracting information from characteristic quantities of electrical machine operation can provide highly useful information about flaws. The purpose of this research is to develop efficient algorithms based on numerous signal processing approaches for correctly detecting asynchronous cage machine rotor defects (rotor bar ruptures).
Źródło:
Diagnostyka; 2022, 23, 2; art. no. 2022201
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wczesne krytyki teorii emergencji
Early critiques of the theory of emergence
Autorzy:
Fornal, Marzena
Powiązania:
https://bibliotekanauki.pl/articles/15010042.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
C. Baylis
British emergentism
critique of emergence
emergence
S.C. Pepper
W.T. Stace
brytyjski emergentyzm
emergencja
krytyka emergencji
Opis:
Idea emergencji w swojej złożonej naukowej postaci została po raz pierwszy sformułowana przez zwolenników brytyjskiego emergentyzmu. Emergentyzm w tej perspektywie był ontologią procesów ewolucyjnych w szerokim sensie, obejmującą relacje pomiędzy różnymi poziomami egzystencji świata. Jednak wraz ze wzrostem popularności tego nurtu zaczęły pojawiać się coraz liczniejsze głosy krytyczne przeciwko tej teorii. Niniejszy artykuł stanowi przegląd argumentów krytycznych skierowanych przeciwko brytyjskiemu emergentyzmowi i ich analizę porównawczą. Omówione zostają prace Stephena C. Peppera, Charlesa Baylisa oraz Waltera Terence’a Stace’a, którzy wskazywali na niemożliwość wyjaśnienia emergentnej nowości z perspektywy mechanicystycznego poglądu na świat.
Źródło:
Przegląd Filozoficzny. Nowa Seria; 2022, 2; 27-42
1230-1493
Pojawia się w:
Przegląd Filozoficzny. Nowa Seria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of T6 Heat Treatment on the Scratch Wear Behavior of Extruded Al-12wt.%Si Alloy
Autorzy:
Kang, Yeon-Ji
Kim, Jong-Ho
Hwang, Jong-Il
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/356776.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-12wt.%Si alloy
scratch test
wear-resistance
T6 heat treatment
Opis:
This study investigated the effect of T6 heat treatment on the microstructure and scratch wear behavior of hypoeutectic Al-12wt.%Si alloy manufactured by extrusion. Microstructural observation identified spherical eutectic Si phases before and after the heat treatment of alloys (F, T6). Phase analysis confirmed Al matrix and Si phase as well as Al2Cu and Al3Ni, Mg2Si in both alloys. In particular, Al2Cu was finer and more evenly distributed in T6 alloy. This resulted in Vickers hardness of T6 alloy that was 2.3 times greater compared to F alloy. The scratch wear test was conducted using constant load scratch test (CLST) mode and multi-pass scratch test (MPST) mode. The scratch coefficient and worn out volume obtained by such were used to evaluate wear properties before and after heat treatment. In the case of T6 alloy, its scratch coefficient was lower than F alloy in all load ranges. After 15 repeated tests to measure worn out volume, F alloy and T6 alloy measured 1.2×10-1 mm3 and 7.8×10-2 mm3, respectively. In other words, the wear resistance of T6 alloy were confirmed to be better than those of F alloy. In addition, this study attempted to identify the microstructural factors that contribute to the better scratch wear resistance of T6 alloy and wear mechanism from surface and cross-section observations after the wear tests.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 617-622
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taekwondo Poomsae Competitor Perceptions of the Official and New Competition Poomsae, Field of Play, and Competition Rules
Autorzy:
Chung, Byung-Kee
Johnson, John Arthur
Powiązania:
https://bibliotekanauki.pl/articles/1922007.pdf
Data publikacji:
2019-02-06
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
2018 Asian Games
Himchari Poomsae
Saebyeol Poomsae
Bigak Poomsae
Nareusya Poomsae
World Taekwondo (WT)
Opis:
Ten new Taekwondo poomsae (forms) were introduced for competition (including the then-named poomsae Himchari, Saebyeol, Bigak, and Nareusya) prior to their inclusion in the 2018 Asian Games in Jakarta, Indonesia. To determine general satisfaction of the current poomsae competition rules, field of play, official poomsae, and new poomsae, a survey of Asia Taekwondo Union poomsae competitors (n=91), coaches (n=33), and referees (n=100) was conducted. A total of 224 respondents completed the survey, but only 193 surveys were viable. Results of this study indicate a positive perception of current competition rules (70%; n=139); field of play (74.6%; n=144); official poomsae (16.5%; n=32); and the new poomsae (Himchari: 73.6%; n=142), (Saebyeol: 73.6%; n=142), (Bigak: 76.7.2%; n=148), and (Nareusya: 72%; n=139). This study should assist Taekwondo governing bodies in establishing practical strategies for the future of poomsae competitions. Numerous conclusions were drawn from this study, but most notably are that athletes, coaches, and referees had little problems with the “old” poomsae but also welcome the new, more challenging ones. This suggests that the respondents understand the value of the original official poomsae and appreciate the challenges that the new poomsae offer. The new poomsae can be said to illustrate how Taekwondo is growing positively while remaining true to its roots.
Źródło:
Physical Activity Review; 2019, 7; 28-39
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taekwondo diplomacy: new possibilities for peace on the Korean Peninsula
Autorzy:
Johnson, John A.
Vitale, George
Powiązania:
https://bibliotekanauki.pl/articles/1923660.pdf
Data publikacji:
2018-11-28
Wydawca:
PPHU Projack Jacek Wąsik
Tematy:
soft diplomacy
international relations
sports diplomacy
International Taekwon-Do Federation (ITF)
World Taekwondo (WT)
Opis:
Sports diplomacy has long been effective in bringing nations and cultures together. Sports diplomacy is a type of soft diplomacy: the more informal diplomatic engagements between non-government entities that sometimes operate with governmental support, but more often as a private exchange. Soft diplomacy has provided governments a place where greater understanding happens, which has in turn led to increased political cooperation. Taekwondo, the Korean martial art turned international Olympic sport, has been used for soft diplomatic purposes almost since its inception. Most recently, the Taekwondo demonstration teams from the Republic of Korea (ROK; South Korea) and the Democratic People's Republic of Korea (DPRK; North Korea) have been used as a tool to bridge the political gap between the two divided nations. The current research introduces a general framework of diplomacy and elucidates the soft diplomacy efforts made by ROK and DPRK Taekwondo organizations in order to provide a foundation for future research on Taekwondo diplomacy and peace negotiations.
Źródło:
Physical Activity Review; 2018, 6; 237-250
2300-5076
Pojawia się w:
Physical Activity Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
WYDZIAŁ TEOLOGICZNY UKSW W LATACH 2013-2017
Autorzy:
Bartnicki, Roman
Powiązania:
https://bibliotekanauki.pl/articles/511856.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
Tematy:
WT
UKSW
Wydział Teologiczny UKSW
historia
Opis:
Artykuł przedstawia historię Wydziału Teologicznego od 2013 do 2017 r.
Źródło:
Studia Theologica Varsaviensia; 2018, 56, 1; 113-134
0585-5594
Pojawia się w:
Studia Theologica Varsaviensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dependence of the Proton Conductivity on Concentration for Networks with Different Symmetry of Molecules
Autorzy:
Masłowski, T.
Dudek, K.
Powiązania:
https://bibliotekanauki.pl/articles/1032489.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
66.30.Dn
66.30.jp
82.20.Wt
Opis:
The one-dimensional numerical model of the proton conductivity in anhydrous solids is used to obtain the conductivity for different values of proton concentration. The model is constructed as a chain of rods or triangles, depending on the symmetry of molecules, linked by hydrogen bonds. An evolution of such system governed by the Grotthuss mechanism is described by means of the kinetic Monte Carlo method. It is shown that in the case of a system with molecules represented by triangles, a decrease in the conductivity corresponds to a significantly broader range of concentrations than is the case for a system constructed by means of rods. This result may prove to be of a potential importance in the case of possible electronic applications. Moreover, for the discussed systems, a strong dependence on the defect formation energies is demonstrated.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 129-131
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computational material analysis of structural and hemodynamic model of coronary stent by CFD/FEA in computer aided mechanical engineering approach
Autorzy:
Karaçal, Ö.
Powiązania:
https://bibliotekanauki.pl/articles/1070469.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.85.G-
81.70.Bt
82.20.Wt
87.10.Kn
87.15.A-
Opis:
With the development of new technologies, it is very popular to use a coronary stent that is a small mesh tube-shaped medical device deployed to treat narrow or weak arteries as part of a procedure called percutaneous coronary intervention. Several aspects, such as stent design, stent wire type, mechanical and material characteristics of stent have different influences on stent intervention. It has not been reported about what impacts on stent struts by the hemodynamic behavior on stent material and very few numerical studies have considered both the mechanical and hemodynamic impact of stent implementation. Computational simulation method for realization of realistic structural and hemodynamic micro environment model in this research provided valuable results of long-term functional knowledge of stent material behavior that are time consuming and expensive to determine otherwise. Computational fluid dynamics and finite element analysis simulation models were investigated and developed to evaluate engineering properties that affect stent functional attributes. These characteristics are dependences of material properties on blood flow conditions such as structural load, shear-strain rate, radial strength, and wall shear stresses, which need to be scientifically explored. To understand the material (Fe-18Cr-14Ni-2.5Mo as stainless steel 316LVM) mechanical performance of the stent, a finite element analysis simulation model was established when exposed to pulsatile blood pressure. In this study, computational fluid dynamics model was generated to calculate the wall shear stresses and strain distribution in stented vessel carrying blood to heart. The analytical analysis of mechanical and hemodynamic conduct of a stent in this investigation may help for better designs of stent, and provide deeper comprehension to support clinical cardiovascular surgeons and guide potential therapeutic strategies.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 249-251
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size Dependent Properties of Hollow Gold Nanoparticles: A Theoretical Investigation
Autorzy:
Senturk Dalgic, S.
Powiązania:
https://bibliotekanauki.pl/articles/1186516.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
82.60.Qr
82.20.Wt
Opis:
A new kind of nanostructures with the negative curvature defined as the hollow ones have recently used in biomedical applications. In this work, an analytic model was developed to compute the size-dependent properties of spherical hollow gold nanoparticles in shell-core-shell configuration. This model has established to calculate the cohesive energies based on the surface energy consideration depending on sizes of inner and outer surfaces of hollow nanoparticles. The size and geometry of the model particles have been obtained by using the stability diagram and the collapsing mechanism was studied by molecular dynamics simulations. The model has been also applied to the hollow particles within unstable and half stable geometry. The predicted results have been compared with each other and those obtained by solid ones. The theoretically predicted size dependent properties are consistent with experimental observations and the hollow quantum dot calculations. Thus, an atomistic insight into the size effect on the cohesive energies of hollow nanoparticles has been presented.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 531-534
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsupervised method for building detection using Gabor filters
Autorzy:
Daamouche, A.
Fares, D.
Maalem, I.
Zemmouri, K.
Powiązania:
https://bibliotekanauki.pl/articles/1068632.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Pj
42.30.Sy
42.68.Wt
Opis:
Automatic methods are a convenient solution to extract buildings from remote sensing images. In this paper, we propose an unsupervised method to extract buildings by means of the Gabor filters and morphological operators. Our proposed method starts from a set of the Gabor filter parameters which is selected empirically to generate a two-dimensional impulse response. The convolution of the impulse response with the image of interest enhances the buildings and attenuates the background. Moreover, morphological operators are applied to further refine the resulting class of interest. The developed algorithm is applied on many remotely sensed images; the obtained results are highly satisfactory and promising.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 28-29
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Spectroscopy of Equal-Channel Angular Pressed Fe-Cr Alloys and Tungsten
Spektroskopia mechaniczna stopów Fe-Cr i wolframu wyciskanych przez kanał kątowy
Autorzy:
Hao, T.
Tang, H.
Jiang, W.
Wang, X.
Fang, Q.
Powiązania:
https://bibliotekanauki.pl/articles/352822.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical spectroscopy
internal friction technique
Fe-18wt.%Cr alloy and pure W
equal-channel angular
spektroskopia mechaniczna
technika tarcia wewnętrznego
stop Fe-18wt%Cr i czystego W
kanał kątowy
Opis:
nternal friction technique was used to investigate the microstructural stability of equal-channel angular pressed (ECAP) 9Cr1Mo steel (T91), Fe-18wt.%Cr alloy, and pure W. Several non-relaxation internal friction peaks are observed in three ECAP-strained specimens, which are related to the microstructural transition from a severely deformed state to a static recovery state of dislocations, and to recrystallized state. Along with the disappearance of the P1 peak, another relaxation internal friction peak P2 is observed during the second heating run only in Fe-18wt.%Cr alloy, and it does not disappear even during subsequent third heating run. This peak is not observed in T91 steel and W. The P2 peak is likely associated with a process of grain boundary (GB) sliding. Unlike T91, no abundant carbide precipitates distribute on GBs to pin GB and repulse GB sliding, thus, the P2 peak only occurs in Fe-18wt.%Cr alloy. It is concluded that high-temperature internal friction measurements are required to detect the grain boundary peak in pure W.
Technika tarcia wewnętrznego została użyta do zbadania stabilności mikrostruktury poddanych wyciskaniu przez kanał kątowy stali 9Cr1Mo (T91), stopu Fe-18wt%Cr, i czystego W. Zaobserwowano wiele nie-relaksacyjnych pików tarcia wewnętrznego w trzech próbkach odkształconych przez ECAP, które są związane z przejściem ze stanu silnie odkształconego do statycznego stanu zdrowienia dyslokacji, i do stanu zrekrystalizowanego. Wraz z zanikiem piku P1, tylko w przypadku stopu Fe-18wt%Cr obserwowany jest inny pik P2 relaksacji tarcia wewnętrznego podczas drugiego ogrzewania, i nie znika nawet w kolejnym trzecim etapie ogrzewania. Pik ten nie jest obserwowany w stali T91 i W. Pik P2 prawdopodobnie związany jest procesem poślizgu granicy ziaren. W przeciwieństwie do stali T91, brak bogatych w węglik wydzieleń na granicach ziaren, które by unieruchomiły granice i uniemożliwiły poślizg, stąd pik P2 występuje tylko w przypadku stopu Fe-18wt.%Cr. Stwierdzono, że pomiary tarcia wewnętrznego w wysokiej temperaturze są potrzebne, aby wykryć pik granicy ziarna w czystym W.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 2101-2106
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seismic Risk Assessment of Historical Eastern Turkish Buildings by Finite Element Analysis
Autorzy:
Çarhoglu, A.
Usta, P.
Korkmaz, K.
Powiązania:
https://bibliotekanauki.pl/articles/1401287.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.11.Fg
81.90.+c
82.20.Wt
Opis:
Traditional masonry buildings, commonly built in Turkey, are one of the important items of cultural heritage. There are many important historical buildings in the east part of Turkey. One of the important locations in east of Turkey is Kilis. In this study, Kilis houses of original types in terms of architectural and functionality, were examined regarding the effects of an earthquake. Therefore, five traditional Kilis houses were examined and the buildings were modeled using SAP2000 finite element software. The models were investigated with different materials such as stone, brick, pumice and cellular concrete material. Time history analyses were performed for the modeled buildings, with three different ground motion records. Displacement values, compressive stresses, tensile stresses, shear stresses and base shear values, obtained from the analysis results were examined in detail. When the results of the study were evaluated, earthquake resistance of buildings was was found to be high and the displacements values were not at a significant level.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1083-1085
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wstępna ocena przydatności troktolitów z masywu Nowej Rudy jako źródła jasnych kruszyw do nawierzchni bitumicznych
Preliminary evaluation of troctolites from Nowa Ruda massif (Lower Silesia) as a source of light-coloured aggregates for asphalt pavements
Autorzy:
Klukowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/144472.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
troktolity
jasne kruszywa
WT-2 2014
nawierzchnie bitumiczne
troctolites
light-coloured aggregates
asphalt pavements
Opis:
Z uwagi na skład mineralny, teksturę i zabarwienie troktolity z masywu Nowej Rudy na Dolnym Śląsku stanowią potencjalne źródło jasnych kruszyw do mieszanek mineralno-asfaltowych. W artykule prezentowane są pierwsze, wstępne wyniki badań właściwości kruszyw uzyskanych z noworudzkuch troktolitów. Na podstawie uzyskanych wyników badań (MLA15, MDE10, WA241, FNaCl1) można stwierdzić, że kruszywa troktolitowe kwalifikują się do zastosowania na warstwy ścieralne nawierzchni.
Due to mineral composition, structure and colour troctolites from Nowa Ruda Massif (Lower Silesia, Poland) can be considered as a potential source of light-coloured aggregates for asphalt pavements. In this paper we publish a brief results of Nowa Ruda troctolite aggregates examinations. According to obtained results (MLA15, MDE10, WA241, FNaCl1) troctolite aggregates qualify for surface course of asphalt pavements.
Źródło:
Drogownictwo; 2015, 9; 285-290
0012-6357
Pojawia się w:
Drogownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
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