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Wyszukujesz frazę "annealing" wg kryterium: Temat


Tytuł:
The Effect of a Change in Recrystallization Annealing Time on the Properties and Structure of Cold-Drawn Wires
Autorzy:
Grygier, D.
Rutkowska-Gorczyca, M.
Dudziński, M.
Powiązania:
https://bibliotekanauki.pl/articles/99719.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
pearlitic steel
annealing
cementite
Opis:
Although many heat treatment schemes have been developed for pearlitic steel, in the literature there is still little information about the influence of the different heat treatment parameters on the percentage, properties and morphology of the phases. Neither there is any information on matching the parameters, taking into account the different degree of deformation of the steel wires, the particular applications and operating conditions of the products. The aim of this research was to optimize the parameters of the interoperation annealing used during the cold plastic work-ing of pearlitic steel intended for cold-drawn wires. The results of the hardness measurements and microscopic observations, presented in this paper clearly show that there is no need to apply long recrystallization treatments to small diameter wires. This finding is highly significant from the economic point of view and it clearly shows the importance of the individual matching of heat treatment parameters to specific industrial applications.
Źródło:
Journal of Machine Engineering; 2015, 15, 1; 90-97
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Post-implantation defects instability under 1 MeV electron irradiation in GaAs
Autorzy:
Warchoł, S.
Rzewuski, H.
Krynicki, J.
Grötzschel, R.
Powiązania:
https://bibliotekanauki.pl/articles/146724.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron annealing
GaAs
implantation
Opis:
The influence of 1 MeV electron irradiation on the stability of post-implantation defects in GaAs has been investigated. The n-type GaAs wafers of <100> orientation were implanted with 150 keV As+ ions below the amorphization threshold at RT using the implantation dose of 2×1013 ions cm–2 at a constant flux of 0.1 žA cm–2. Then the implanted samples were irradiated with a scanned beam of 1 MeV electrons from a Van de Graaff accelerator in a dose range (0.5–5.0)×1017 cm–2 at 320 K. RBS and channeling spectroscopy of 1.7 MeV 4He+ ions were used to determine the depth distribution of defect concentration before and after 1 MeV irradiations. New results of an "oscillatory" behaviour of the damage level as a function of 1 MeV electron fluence are presented.
Źródło:
Nukleonika; 2000, 45, 4; 225-228
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular dependence of post-implantation damage recovery under 1 MeV electron irradiation in GaAs
Autorzy:
Warchoł, S.
Rzewuski, H.
Krynicki, J.
Grotzschel, R.
Powiązania:
https://bibliotekanauki.pl/articles/147146.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron annealing
GaAs
implantation
Opis:
The angular dependence of post-implantation defects removal in GaAs irradiated with 1 MeV electrons from a Van de Graaff accelerator has been investigated. The possible way of enhancing defect annealing consists in ionization created by electron irradiation. In this paper new results of a damage level behaviour dependent on 1 MeV electron beam angle irradiation are presented. GaAs single crystals of <100> orientation were implanted with 150 keV As+ ions at RT and then irradiated with a scanning beam of 1 MeV electrons at some selected angles. Rutheford Backscattering Spectroscopy (RBS) of 1.7 MeV 4He+ ions were used to determine the depth distribution of defect concentration before and after electron irradiation. The results relate clearly the ionization intensity created by the electron beam with angle of incidence with respect to the GaAs <100> orientation.
Źródło:
Nukleonika; 2002, 47, 1; 19-21
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optymalizacja procesu odprężania wyrobów szklanych formowanych ręcznie w odprężarce komorowej elektrycznej
The optimization of the annealing process of hand formed glass in electric annealing furnace
Autorzy:
Woźniak, M.
Skorek, A.
Powiązania:
https://bibliotekanauki.pl/articles/168061.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
Tematy:
szkło artystyczne
odprężanie
naprężenia wewnętrzne
odprężarka
artistic glass
annealing
interior stresses
annealing furnace
Opis:
Prowadzenie procesu odprężania szkła nie jest proste w sytuacji, gdy w zakładzie wytwarzane są przedmioty o różnorodnym kształcie i wielkości, ze szkła dmuchanego i szkła pełnego, w małych seriach. Taka produkcja wymaga zoptymalizowania procesu obróbki cieplnej (odprężania), ponieważ wyroby z pełnego szkła – takie jak galanteria szklana – przy zbyt wysokiej górnej temperaturze odprężania mogą ulegać deformacjom (są jeszcze plastyczne). Z kolei zbyt niska temperatura procesu nie pozwala na eliminację naprężeń wewnętrznych. W artykule przedstawiono, w jaki sposób wyniki badań naprężeń wewnętrznych przeprowadzonych dla kilku reprezentatywnych wyrobów produkowanych w krakowskim Oddziale Instytutu Ceramiki i Materiałów Budowlanych wpłynęły na zmianę prowadzenia procesu odprężania szkła.
Conducting of the glass annealing process is not an easy one in a situation when in a factory artefacts of different shapes and sizes are produced, from blown and from thick glass, in short series. This kind of production requires the optimization of annealing process because the artefacts from thick glass – glass animals, flowers, paperweights can be distorted due to too high upper annealing temperature. Excessively low upper annealing temperature, by contrast, precludes the release of interior stresses. The paper presents the results of interior stresses tests conducted for several representative artefacts produced in Kraków Division of Institute of Ceramics and Building Materials and shows how they influenced the conducting of the glass annealing process.
Źródło:
Szkło i Ceramika; 2017, R. 68, nr 3, 3; 11-14
0039-8144
Pojawia się w:
Szkło i Ceramika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective Design of the Simulated Annealing Algorithm for the Flowshop Problem with Minimum Makespan Criterion
Autorzy:
Hurkała, J.
Hurkała, A.
Powiązania:
https://bibliotekanauki.pl/articles/309187.pdf
Data publikacji:
2012
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
flowshop
heuristics
makespan
simulated annealing
Opis:
In this paper we address the n-job, m-machine flowshop scheduling problem with minimum completion time (makespan) as the performance criterion. We describe an efficient design of the Simulated Annealing algorithm for solving approximately this NP-hard problem. The main difficulty in implementing the algorithm is no apparent analogy for the temperature as a parameter in the flowshop combinatorial problem. Moreover, the quality of solutions is dependent on the choice of cooling scheme, initial temperature, number of iterations, and the temperature decrease rate at each step as the annealing proceeds. We propose how to choose the values of all the aforementioned parameters, as well as the Boltzmann factor for the Metropolis scheme. Three perturbation techniques are tested and their impact on the solutions quality is analyzed. We also compare a heuristic and randomly generated solutions as initial seeds to the annealing optimization process. Computational experiments indicate that the proposed design provides very good results - the quality of solutions of the Simulated Annealing algorithm is favorably compared with two different heuristics.
Źródło:
Journal of Telecommunications and Information Technology; 2012, 2; 92-98
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Annealing Treatment on Deep Drawing Behavior of Q235 Carbon Steel /410/304 Stainless Steels Three-Layer Composite Plate
Autorzy:
Lv, Zehua
Zhang, Zhixiong
Han, Jianchao
Wang, Tao
Powiązania:
https://bibliotekanauki.pl/articles/2106574.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite plate
deep drawing
annealing
microstructure
Opis:
Effect of annealing treatment on deep drawing behavior of hot-rolled Q235 carbon steel/410/304 stainless steel three-layer composite plate was investigated. Deep drawability of the unannealed composite plates exhibits a sharp difference for various contact surfaces with the die. The limit drawing ratio (LDR) of the composite plate with the carbon steel contacting the die is 1.75, while it is 1.83 with the stainless steel contacting the die due to the different mechanical responses to the tensile stress at the corner of the die. After annealing at 900°C for 2 h, however, the deep drawabilities of the composite plates both for various contact surfaces with the die are significantly improved and becomes almost identical, which are attributed to the stress relief, the enhanced ductility and the improved interface bonding strength of the hot-rolled component plates during annealing.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 421--433
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical annealing model of damage in arrays of nanopillars
Autorzy:
Derda, T.
Powiązania:
https://bibliotekanauki.pl/articles/122700.pdf
Data publikacji:
2013
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
nanopillars
fibre bundle model
mechanical annealing
Opis:
The mechanical damage accumulation occurring in an array of axially loaded nanopillars is studied within the stochastic approach. To each nanopillar, an initial strength--threshold is assigned which is drawn from the Weibull probability distribution. Under the influence of load exceeding the strength-threshold the pillar height is reduced. Then the reduced pillar gets new higher strength-threshold and its load is transferred to other working pillars. We analyse slip loads causing the system height reductions and avalanches of the pillar height reductions.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 4; 31-40
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer Software Tool for the Design of Optimal Thermal Cycles in the Continuous Annealing of DP Steels
Autorzy:
Górecki, G.
Madej, Ł.
Pietrzyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/99406.pdf
Data publikacji:
2014
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
DP steels
continuous annealing
virtual process
Opis:
The objective of the paper was development of the software tool, which can be used to design the best continuous annealing technology for DP steels in a fast and efficient way. The model of phase transformations during heating and cooling stages, which is the basis of this tool, is described briefly. Results of identification and validation of the model are presented, as well. Due to complex thermal cycles in the continuous annealing process and large number of the design variables, selection of the optimal technology is difficult. It is expected that the developed model will help to evaluate various technological variants and to compare them. To make this procedure more efficient, the user friendly software was developed. Basic principles and features of this tool are presented in the work. The main functionalities of the software compose simulation of phase transformations during thermal cycles and capability to apply simulations to design the best technological variant. Beyond this a data base, which stores material and technological information for all previously analysed cases, is included in the developed software. Graphical user interface is added to make the software easily accessible and user friendly.
Źródło:
Journal of Machine Engineering; 2014, 14, 1; 74-83
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wysokotemperaturowego wygrzewania na właściwości elektryczne nanokompozytu (FeCoZr)81.8(CaF2)18.2
Вплив високотемпературного відпалювання на електричні властивості нанокомпозиту (FeCoZr)81.8(CaF2)18.2
High temperature annealing influence on electric properties of nanocomposite (FeCoZr)81.8(CaF2)18.2
Autorzy:
Bondariev, V.
Koltunowicz, T. N.
Powiązania:
https://bibliotekanauki.pl/articles/408467.pdf
Data publikacji:
2015
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
nanokompozyty
wygrzewanie
konduktywność
nanocomposites
annealing
conductivity
Opis:
Praca przedstawia wyniki badań wpływu wygrzewania na zmiennoprądowe właściwości elektryczne nanokompozytu (FeCoZr)x(CaF2)(100-x) o zawartości fazy metalicznej x = 81,8 at.% wytworzonego metodą jonowo-wiązkowego rozpylania w atmosferze argonu Ar i tlenu O2. Zaobserwowano, że w materiale są dwa rodzaje studni potencjału różniących się czasami relaksacji. Wygrzewanie powoduje zanik maksimów na częstotliwościowej zależności współczynnika częstotliwościowego α oraz wygładzenie odcinków wzrostu konduktywności na sigma(f), co oznacza całkowite utlenienie materiału
В статті наведено результати впливу відпалювання на електричні властивості на змінному струмі нанокомпозиту (FeCoZr)x(CaF2)(100-x), який має металеву фазу х = 81,8 ат.%, утвореного методом іонно-пучкового розпилення в атмосфері аргону Ar і кисню O2. Було виявлено, що в матеріалі є два різновиди студні потенціалу, які відрізняються часом релаксації. Відпалювання призводить до зникнення піків на частотній залежності частотного коефіцієнта α і згладжування діапазону зросту провідності sigma(f), що означає повне окислення матеріалу.
This paper presents results of researches on annealing influence on AC electric properties of nanocomposite (FeCoZr)x(CaF2)(100-x) with metallic phase content x = 81.8 at.% which was produced by ion-beam sputtering in argon Ar and oxygen O2 atmosphere. It was observed that there are two types of potential wells in the material, which are different in relaxation times. Annealing causes maximums disappearance on frequency dependence on frequency coefficient α and growing section smoothing, which means complete oxidation of material.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 4; 70-76
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing effect on microstructure and chemical composition of Inconel 625 alloy
Wpływ wyżarzania na mikrostrukturę i skład chemiczny stopu Inconel 625
Autorzy:
Petrzak, P.
Kowalski, K.
Rozmus-Górnikowska, M.
Dębowska, A.
Jędrusik, M.
Koclęga, D.
Powiązania:
https://bibliotekanauki.pl/articles/264128.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Inconel 625
microsegregation
annealing
mikrosegregacja
wyżarzanie
Opis:
Our research focused on Inconel 625 weld overlays on 16Mo3 steel boiler pipes. The investigation focused on the characterization of changes in the microstructure and chemical composition after annealing. The annealing was performed for ten hours at temperatures from 600 to 1000°C. Changes in the microstructure were observed with a scanning and transmission electron microscope (SEM and TEM). The investigation was supplemented by hardness measurements.
Badania przeprowadzono na napoinach ze stopu Inconel 625 na stali kotłowej 16Mo3. Skoncentrowano się na charakterystyce mikrostruktury i składu chemicznego zmian po wyżarzaniu. Obróbkę cieplną przeprowadzono w temperaturze od 600 do 1000°C przez 10 godzin. Zmiany mikrostruktury obserwowano przy użyciu skaningowej i transmisyjnej mikroskopii elektronowej (SEM i TEM). Badania zostały uzupełnione o pomiary twardości.
Źródło:
Metallurgy and Foundry Engineering; 2018, 44, 2; 73-80
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Post-recoil thermal annealing study of 177Lu, 169Yb, 175Yb, 166Ho and 153Sm in different organometallic compounds
Autorzy:
Nassan, L.
Achkar, B.
Yassine, T.
Powiązania:
https://bibliotekanauki.pl/articles/146678.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
thermal annealing
lutetium
ytterbium
holmium
samarium
Opis:
Post-recoil thermal annealing study at different temperatures for different intervals of time of the recoiled isotopes 169Yb, 175Yb, 177Lu, 166Ho, and 153Sm resulting from the nuclear reactions 168Yb(n,gamma)169Yb, 174Yb(n,gamma)175Yb and 176Yb(n,gamma)177Yb → 177Lu, 165Ho(n,gamma)166Ho, 152Sm(n,gamma)153Sm, respectively in different organometallic compounds Yb(OCC(CH3)3CHCOC(CH3)3)3, Ho(OCC(CH3)3CHCOC(CH3)3)3, (C5H5)3Ho, and (C5H5)3Sm were carried out. The thermal annealing behaviors of 177Lu, 169Yb, 175Yb, 166Ho, and 153Sm were found to be different in the compounds under investigation. The differences in the patterns of the obtained isothermal curves were discussed. Depending on the post- -recoil thermal annealing manner the reactions taking place during thermal annealing were suggested.
Źródło:
Nukleonika; 2011, 56, 2; 185-190
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An enhanced krill herd optimization technique used for classification problem
Autorzy:
Al-Mashhadani, Firas N.
Alsaffar, Qusay S.
Al-Jadir, Ibrahim A.
Powiązania:
https://bibliotekanauki.pl/articles/35535690.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
optimization
simulated annealing
standard krill herd
Opis:
In this paper, this method is intended to improve the optimization of the classification problem in machine learning. The EKH as a global search optimization method, it allocates the best representation of the solution (krill individual) whereas it uses the simulated annealing (SA) to modify the generated krill individuals (each individual represents a set of bits). The test results showed that the KH outperformed other methods using the external and internal evaluation measures.
Źródło:
Scientific Review Engineering and Environmental Sciences; 2021, 30, 2; 354-364
1732-9353
Pojawia się w:
Scientific Review Engineering and Environmental Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and TEM characterization of phase transformation in Zn ion implanted and thermal oxidized quartz
Autorzy:
Privezentsev, Vladimir
Powiązania:
https://bibliotekanauki.pl/articles/763347.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
quartz, zinc, ion implantation, annealing, ZnO nanoparticles
Opis:
Metal and metal oxide nanoparticles (NPs) embedded in various matrices have been the object of increasing interest due to their peculiar physical properties significantly different from the corresponding ones of bulk material. Metallic Zn NPs can be used in UV photo-detectors. Zinc oxide NPs play an important role too, since ZnO has direct band gap of 3.37eV, large exiton binding energy of 60meV, sorption effect, room temperature ferromagnetism and others. So they can be used in varies perspective electron devices. In this paper the optical parameters and transmission electron microscopy (TEM) characterization of Zn implanted quartz during NP formation at annealing are reported.Optical-grade high-pure (OH-: 50ppb) amorphous quartz slides were implanted by 64Zn+ ions with fluence of 5×1016/cm2 and energy of 50keV. To avoid the magnificent substrate heating during implantation the ion current density was less than 0.5μA/cm2. Than the samples were subjected to isochronally during 1h oxidation in temperature ranges from 400 up to 800oC. The Zn contained phase creation and its thermal evolution were investigated by recording the optical transmittance spectra at room temperature in a spectral range of 200-800nm and by photoluminescence at temperatures of 10-300K in a spectral range of 350-800nm using an illumination of He-Cd laser with wavelength of 325nm. Visualization and identification of NPs was made by study of the cross section samples TEM fitted with electron diffraction, an EDAX detector attachment for X-ray energy dispersive spectroscopy (EDS), and with a high angle annular dark field detector (HAADF) for scanning operation. The EDS maps of the element distribution and the NP sizes were determined in the scanning TEM regime.As a result of these studies it was found that after the quartz implantation by 64Zn+ ions with fluence of 5×1016/cm2 and energy of 50keV the amorphous metallic Zn NPs with an average radius of 3 nm were created. During process of sequentially isochronally furnace annealing in oxygen atmosphere in 1h in temperature ranges from 400 up to 800oC in samples there was phase transformation from metallic Zn phase to its oxide form. After annealing at 800oC the Zn NPs transform to the ZnO or/and Zn2SiO4 phase with average radius of 4,5nm. 
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica; 2016, 71
0137-6861
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of microstructure properties: random variability of soil solid thermal conductivity
Autorzy:
Stefaniuk, D.
Różański, A.
Łydżba, D.
Powiązania:
https://bibliotekanauki.pl/articles/178952.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
simulated annealing
heat transfer
homogenization
saturated soil
Opis:
In this work, the complex microstructure of the soil solid, at the microscale, is modeled by prescribing the spatial variability of thermal conductivity coefficient to distinct soil separates. We postulate that the variation of thermal conductivity coefficient of each soil separate can be characterized by some probability density functions: fCl(λ), fSi(λ), fSa(λ), for clay, silt and sand separates, respectively. The main goal of the work is to recover/identify these functions with the use of back analysis based on both computational micromechanics and simulated annealing approaches. In other words, the following inverse problem is solved: given the measured overall thermal conductivities of composite soil find the probability density function f(λ) for each soil separate. For that purpose, measured thermal conductivities of 32 soils (of various fabric compositions) at saturation are used. Recovered functions f(λ) are then applied to the computational micromechanics approach; predicted conductivities are in a good agreement with laboratory results.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 1; 99-107
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ion implantation followed by laser/pulsed plasma/ion beam annealing : a new approach to fabrication of superconducting MgB2 thin films
Autorzy:
Piekoszewski, J.
Werner, Z.
Barlak, M.
Kolitsch, A.
Szymczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/146817.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
MgB2
superconducting films
pulsed plasma annealing
Opis:
The paper presents a new approach to formation of superconducting MgB2 thin films: ion implantation followed by annealing in an unconventional second step treatment using pulsed laser, plasma, or ion beams. Merits and drawbacks of individual approaches are discussed.
Źródło:
Nukleonika; 2008, 53, 1; 7-10
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of simulated annealing method for optimization of fractional order PID controller
Autorzy:
Mikulski, S.
Powiązania:
https://bibliotekanauki.pl/articles/97234.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
fractional order controller
optimization
fractional calculus
simulated annealing
Opis:
The paper describes method of parameters selection for control system with fractional order PIλDμ controller steering second order oscillated object. As a selection algorithm was used simulated annealing optimization method with random variant of cooling strategy. As a target function for optimization was selected Integral Squared Error (ISE).
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 178-187
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Recrystallization Annealing on the Properties and Structure of Low-Carbon Ferritic Steel IF
Autorzy:
Kowalczyk, K.
Jabłońska, M.
Rusz, S.
Junak, G.
Powiązania:
https://bibliotekanauki.pl/articles/355122.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
low-carbon IF steel
annealing
mechanical properties
microstructure
Opis:
This paper shows results of researches of a structure and mechanical properties of metal sheets of IF steels subjected to recrystallization annealing. The annealing was held in the scope of the temperature of 600-900°C over 25 min time. The impact of heat treatment on changes of properties and structure of the researches steel has been analysed. During annealing typical processes of rebuilding of the structure deformed as a result of cold deformation in the form of forming new recrystallized grains and their growth were observed. As the temperature of annealing increases the hardness of the material gradually decreases.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1957-1961
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure Evaluations in Pearlitic Steels Wires Resulting from Modification of the Interoperation Annealing Process
Autorzy:
Grygier, D.
Rutkowska-Gorczyca, M.
Jasiński, R.
Dudziński, W.
Gershtein, G.
Powiązania:
https://bibliotekanauki.pl/articles/100087.pdf
Data publikacji:
2014
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
pearlitic steel
cold drawing
cold rolling tempering
annealing
Opis:
Pearlitic steels containing from some 0.8 to 0.95% C belong to the group of unalloyed steels of the quality class destined for cold drawing or rolling. At the same time, the steels are characterised with particularly low share of non-metallic inclusions and limited contents of chromium and nickel, which extend the pearlite reaction time. The pearlitic steel in the annealed state has the highest strength in relation to other unalloyed steels, therefore she have found application mainly as wire rods for springs, wires for car tire reinforcement and cables. However one of the issues widely discussed in literature is cracking of pearlitic steel subjected to plastic working, caused by high brittleness of the lamellar precipitations of hard cementite. This issue is extremely important because it affects significantly reduce fatigue strength. The paper presents proposals to modify the process of interoperation annealing in order to eliminate this problem.
Źródło:
Journal of Machine Engineering; 2014, 14, 1; 53-62
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of groundwater quality monitoring network using information theory and simulated annealing algorithm
Autorzy:
Treichel, W.
Kucharek, M.
Powiązania:
https://bibliotekanauki.pl/articles/2063028.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
simulated annealing
monitoring network
information theory
optimization
entropy
Opis:
In this paper a methodology of assessment and optimization of groundwater quality monitoring network which takes into account the evaluation criteria derived from the Shannon information theory is presented. The fundamental criteria derived from this theory are: (1) the value of marginal information entropy, which is a measure of the amount of information containing in the data in a location of sampling point, and (2) the value of transinformation (mutual information) which measures the amount of information shared between each of two sampling points. Transinformation can be interpreted as an index of the stochastic dependence between the random variables corresponding to groundwater quality data recorded in different sampling points of monitoring network and shows the reduction of uncertainty included in one variable due to the knowledge of the other variable. In the optimization problem the objective function involving the value of transinformation of the investigated water quality parameters (Cl, Cu, Na) is minimized. To minimize the objective function the simulated annealing algorithm, which allows to find a satisfactory sub-optimal solution, was used. The proposed methodology was applied to optimize the groundwater monitoring network of contaminant reservoir Żelazny Most, one of the worlds biggest industrial waste disposal site, which collects post-flotation contaminants originating from copper ore treatment. The results show an increase in the effectiveness of the monitoring network by reducing the number of sampling points while maintaining an acceptable amount of information available in the network.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2010, 441 Hydrogeologia z. 10; 193--199
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Diffusion Annealing on Borides Layers Produced on XC38 Steel
Autorzy:
Rayane, K.
Allaoui, O.
Allaoui, A.
Powiązania:
https://bibliotekanauki.pl/articles/1031131.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
boriding
molten salts
annealing diffusion
XC38 steel
Opis:
In this work, we present a study of the effect of diffusion annealing at 700°C for 1 h on the nature and properties of boride layers obtained on XC38 steel through a molten salt consisting of borax (Na₂B₄O₇) and boron carbide (B₄C). We evaluated the changes brought by the diffusion annealing on the morphology of the boride layer, the thickness of this layer, the distribution of elements in the steel, and the hardness. Comparing the results obtained allowed concluding that the diffusion annealing will completely transform the two-phase layer formed of FeB and Fe₂B borides in a single-phase layer consisting of single boride Fe₂B. The transformation of the two-phase boride into a single-phase boride is done with an increase in thickness of about 30% compared to the initial thickness of the sample. The values of Si concentration obtained in the underlying zone after the diffusion annealing treatment are more important than those obtained in the same underlying zone of samples borided directly by immersion in molten salt consisting of borax and silicon carbide (SiC).
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 521-523
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effectiveness of spheroidization pearlitic steel with regard to the degree of plastic deformation
Autorzy:
Grygiel, D.
Dudziński, W,
Gerstein, G.
Nürnberger, F.
Powiązania:
https://bibliotekanauki.pl/articles/1190029.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
stal perlityczna
wyżarzanie
cementyt
pearlitic steel
annealing
cementite
Opis:
Pearlitic steels containing from some 0,8 to 0,95% C belong to the group of unalloyed steels of the quality class destined for cold drawing or rolling, they find application mainly as wires used for reinforcement of tires, hoses or rope production. However this group of steels characterized low machinability, as a consequence of presence hard plates of cementite, the intervention ameliorative this property is spheroidizing annealing. The object of the tests presented in paper was wires of pearlitic steel obtained after the successive stages of cold plastic working. The aim of the tests was to show that the condition of the material and mainly degree of plastic deformation have a clearly influence on the effectiveness of pearlitic steel spheroidization.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2015, 3, 1; 6--9
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of annealing temperature on the structural and optical properties of CdSe: 1% Ag thin films
Autorzy:
Shehab, Alia A. A.
Mustafa, Mohammad H.
Majeed, Samir G.
Powiązania:
https://bibliotekanauki.pl/articles/1192119.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
annealing
XRD
Optical
CdSe: 1% Ag
thin films
Opis:
CdSe: 1% Ag thin films prepared by thermal evaporation method on glass substrates under vacuum technique with rate of deposition equal to 50 nm/min, the deposited films thickness (1µm) on glass substrates have been annealed at different temperatures for one hour. XRD measurement shows that the films have polycrystalline structure at R.T and change to single crystalline when annealed these films for different annealing temperatures (423, 473, 523 K). The optical measurement indicated that CdSe: 1% Ag films have direct optical energy gap, and it decreases with increasing annealing temperatures. The optical constant refractive index, extinction coefficient and dielectric constants were also studied.
Źródło:
World Scientific News; 2016, 45, 2; 185-195
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An adaptive hybrid metaheuristic for permutation flowshop scheduling
Autorzy:
Moccellin, J.
Santos, M.
Powiązania:
https://bibliotekanauki.pl/articles/206870.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
flowshop sequencing
hybrid metaheuristics
simulated annealing
tabu search
Opis:
In this paper we present a hybrid Tabu Search - Simulated Annealing heuristic fox the minimal makespan flowshop sequencing problem. In order to evaluate the effectiveness of the hybridization we compare the hybrid metaheuristic with pure Tabu Search and Simulated Annealing heuristics. The results from computational experience are discussed.
Źródło:
Control and Cybernetics; 2000, 29, 3; 761-771
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Mechanical Properties of as Cast Al-6.5Mg-1.5Zn-0.5Fe Alloy Followed by Cold Rolling and Subsequent Annealing
Autorzy:
Lee, Seong-Hee
Powiązania:
https://bibliotekanauki.pl/articles/356133.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
cold rolling
annealing
microstructure
mechanical properties
Opis:
Microstructures and mechanical properties of as-cast Al-6.5Mg-1.5Zn-0.5Fe alloys newly alloy-designed for the parts of automobile were investigated in detail. The aluminum (Al) sheets of 4 mm thickness, 30 mm width and 100 mm length were reduced to a thickness of 1 mm by multi-pass rolling at ambient temperature and subsequently annealed for 1h at 200~500°C. The as-cast Al sheet was deformed without a formation of so large cracks even at huge rolling reduction of 75%. The recrystallization begun to occur at 250°C, it finished at 350°C. The as-rolled material showed tensile strength of 430 MPa and tensile elongation of 4.7%, however the specimen after annealing at 500°C showed the strength of 305 MPa and the elongation of 32%. The fraction of high angle grain boundaries above 15 degree increased greatly after annealing at high temperatures. These characteristics of the specimens after annealing were discussed in detail.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 875-878
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Transition and Plasticity Enhancement of Ti-Cu-Based Bulk Metallic Glasses
Autorzy:
Wang, L.
Wang, X.
Zhang, G.
Sun, X.
Powiązania:
https://bibliotekanauki.pl/articles/356824.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk metallic glasses
phase transition
annealing
stability
plasticity
Opis:
In this paper, we report the complex crystallization kinetics of phase transition happening in Ti-Cu-based bulk metallic glasses (BMGs), which play significant roles in the glass formation with respect to their low reduced glass transition temperatures, Trg. The first exothermic event just occurs when annealing the BMG samples in the supercooled liquid region, leading to the Avrami exponent deviating from conventional modes affected by the residual amorphous phase. For Ti43Cu43Ni7Zr7 BMG, the plasticity can be improved by pre-annealing at a sub-Tg temperature of 623K (≈50K below Tg) for 0.5 hour, however, deteriorated by 1 hour annealing, which could be related to the change in stability of this BMG against crystallization with different pre-annealing times.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 387-391
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Possibilities of Using Forging Heat in Isothermal Annealing Processes for AISI 4140 Alloy
Autorzy:
Zwierzchowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/352575.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AISI 4140 steel
isothermal annealing
forging
thermal treatment
Opis:
Production processes of hot forging most often look similar [1-3]. Forging in several operations, usually in three or four. Most often the first operation is upsetting or flattening (sometimes rolling). The last operation is finishing forging. This applies to the production of steel forgings for the automotive, agricultural and other similar industries. Typical production proceeds as follows: the forgings are cleaned (shot-blasted) and then heat treatment is performed. It can be normalization, hardening and tempering, etc. After the heat treatment, forgings are checked and subjected to strength and microscopic tests, hardness tests, impact tests. The type of tests depends on the recipient. The process described in the work takes place in three operations. The heat treatment used so far is hardening and tempering. An attempt was made to change the heat treatment technology for a selected product made of 42CrMo4 steel (1.7225) (4140). An isothermal annealing test was carried out at different temperatures and for different times. The possibility of using heat from the forging process in heat treatment processes for the described product has been confirmed.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 951-958
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stopy na osnowie fazy międzymetalicznej TiAI I ich obróbka cieplna
TiAI intermetallic phase based alloys and their heat treatment
Autorzy:
Szkliniarz, W.
Powiązania:
https://bibliotekanauki.pl/articles/109288.pdf
Data publikacji:
2013
Wydawca:
AXIS MEDIA
Tematy:
faza międzymetaliczna TiAl
obróbka cieplna
stopy metali
stopy tytanu
nadstopy niklu
wyżarzanie ujednorodniające
wyżarzanie zupełne
wyżarzanie niezupełne
intermetallic phase TiAl
heat treatment
alloys
titanium alloys
nickel superalloys
solution annealing
annealing
incomplete annealing
Opis:
W artykule w oparciu o najnowsze publikacje źródłowe oraz oryginalne wyniki badań własnych przedstawiono charakterystykę nowej generacji stopów tytanu na osnowie uporządkowanej fazy międzymetalicznej TiAI, konkurencyjnych wobec konwencjonalnych stopów tytanu oraz nadstopów niklu. Przedstawiono najważniejsze właściwości tej grupy stopów oraz wskazano aktualne i możliwe obszary ich zastosowania. Charakteryzując poszczególne etapy rozwoju tych stopów w okresie ostatnich kilkudziesięciu lat, starano się udzielić odpowiedzi na pytania:, jaki jest stan aktualny i perspektywy dla tych stopów, jakie bariery należy pokonać i problemy rozwiązać, aby stały się one zamiennikami drogich i ciężkich nadstopów niklu. Scharakteryzowano także skład chemiczny poszczególnych generacji stopów, ich mikrostrukturę oraz oddziaływanie mikrostruktury na właściwości. Opisując przemiany fazowe występujące podczas nagrzewania i chłodzenia po-kazano możliwości ich wykorzystania do kształtowania mikrostruktury i właściwości w procesach obróbki cieplnej stosowanych na poszczególnych etapach wytwarzania i przetwarzania tych stopów. Szczególną uwagę poświęcono nowej, autorskiej metodzie wieloetapowej obróbki cieplnej prowadzącej do ukształtowania wymaganej mikrostruktury tej grupy stopów, której najważniejszymi etapami są: wyżarzanie ujednorodniające, cykliczna obróbka cieplna, wyżarzanie niezupełne i wyżarzanie zupełne.
In this paper, based on the latest publications on the source and original results of research presents the characteristics of a new generation of titanium alloys on the base of an ordered TiAl intermetallic phase competing with conventional titanium alloys and nickel superalloys. The paper presents the main characteristics of this group of alloys and identifies current and possible areas of application. In describing the various stages of the development of these alloys in the last few decades, attempts to answer the questions: what is the current status and prospects for these alloys, the barriers to be overcome and problems to solve, so that they become substitutes for expensive and heavy nickel superalloys. Characterized also the chemical composition of each generation alloys, their microstructure and microstructure effect on the properties. Describing the phase transformations that occur during heating and cooling is shown the possibility of their use in the formation of the microstructure and Describing the phase transformations that occur during heating and cooling is shown the possibility of their use in the formation of the microstructure and properties of the thermal treatment applied at the various stages of production and processing of these alloys. Particular attention was paid to the new method, multi-stage proprietary heat treatment leads to the formation of the desired microstructure of the alloy group, whose main steps are: homogenization annealing, cyclic heat treatment, under-annealing and full annealing.
Źródło:
Piece Przemysłowe & Kotły; 2013, 9-10; 8-12
2082-9833
Pojawia się w:
Piece Przemysłowe & Kotły
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Significant Influence of Annealing Temperature and Thickness of Electrode on Energy Conversion Efficiency of Dye Sensitized Solar Cell: Effect of Catalyst
Autorzy:
Uddin, J.
Islam, J. M. M.
Khan, S. M. M.
Hoque, E.
Khan, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/412298.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dye Sensitized Solar Cell
sensitizer
catalyst
annealing temperature
thickness
Opis:
Dye sensitized solar cell (DSSC) shows great promise as an alternative to conventional p-n junction solar cells due to their low fabrication cost and reasonably high efficiency. DSSC was assembled by using natural dye extracted from red amaranth (Amaranthus Gangeticus) as a sensitizer and different catalysts for counter electrode were applied for maximum energy conversion efficiency. Annealing temperature and thickness of electrode were also investigated and optimized. Catalyst, annealing temperature and thickness were optimized by the determination of cell performance considering photoelectrochemical output and measuring current and voltage; then calculating efficiency and other electrical parameters. The experimental results indicated that samples having 40 μm electrode thickness and prepared at 450 o C annealing temperature showed the best performance.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 78-87
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production of Chromium Boride Layers on Carbon Steel with Conversion Treatment: Chromium Deposition + Diffusion Annealing
Autorzy:
Boubaaya, R.
Benarioua, Y.
Allaoui, O.
Djendel, M.
Powiązania:
https://bibliotekanauki.pl/articles/1031720.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
carbon steel
boriding
chromium plating
diffusion annealing
chromium boride
Opis:
The present study has been conducted in order to obtaining chromium boride layers on carbon steel using a conversion processing comprising the following steps: boriding treatment in order to increase the amount of boron atoms in the steel surface, deposition of a thin layer of pure chromium using electrolytic method, and finally an annealing treatment for boron diffusion and formation of boride layer until complete transformation of chromium layer. Depending on the method used (chromium deposition followed by boriding or boriding followed by chromium deposition) and the holding time, the partial or complete conversion is obtained as a result of the diffusion process. The role of the annealing temperature on transformation rates of chromium into chromium boride films was investigated. It is shown that for 1 h at 900°C, the chromium layer is totally transformed. The scanning electron microscopy analysis and X-ray diffraction showed the presence of CrB and CrB₂ chromium borides in addition of FeB and Fe₂B iron borides.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 541-543
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Score level and rank level fusion for KINECT-based multi-modal biometric system
Autorzy:
Rahman, Md Wasiur
Zohra, Guellati Fatma
Gavrilova, Marina L.
Powiązania:
https://bibliotekanauki.pl/articles/91778.pdf
Data publikacji:
2019
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
Lane-Emden equations
simulated annealing
legendre polynomials
neural network
Opis:
Computational intelligence firmly made its way into the areas of consumer applications, banking, education, social networks, and security. Among all the applications, biometric systems play a significant role in ensuring an uncompromised and secure access to resources and facilities. This article presents a first multimodal biometric system that combines KINECT gait modality with KINECT face modality utilizing the rank level and the score level fusion. For the KINECT gait modality, a new approach is proposed based on the skeletal information processing. The gait cycle is calculated using three consecutive local minima computed for the distance between left and right ankles. The feature distance vectors are calculated for each person’s gait cycle, which allows extracting the biometric features such as the mean and the variance of the feature distance vector. For Kinect face recognition, a novel method based on HOG features has been developed. Then, K-nearest neighbors feature matching algorithm is applied as feature classification for both gait and face biometrics. Two fusion algorithms are implemented. The combination of Borda count and logistic regression approaches are used in the rank level fusion. The weighted sum method is used for score level fusion. The recognition accuracy obtained for multi-modal biometric recognition system tested on KINECT Gait and KINECT Eurocom Face datasets is 93.33% for Borda count rank level fusion, 96.67% for logistic regression rank-level fusion and 96.6% for score level fusion.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2019, 9, 3; 167-176
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Analysis of Nitrogen as an Alloying Element in WC9 Grade Steel
Autorzy:
Vishnuh, V.
Sudhakar, S.
Tamilarasu, K.
Prabhakaran, P.
Rajasekar, R.
Powiązania:
https://bibliotekanauki.pl/articles/352617.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nitrogen alloying
WC9 steel
solution annealing
mechanical properties
Opis:
In the present work the effect of nitrogen on WC9 alloy at various weight percentages was analyzed and tested for their microstructural and mechanical properties. The nitrogen was added at 0.05, 0.10, 0.15, 0.20 and 0.25 wt. % in the solid form as nitrided ferrochrome to WC9 alloy. The samples were heat treated by solution annealing process at a temperature of 1100°C for 5 hours to improve the austenitic formation. Microstructures and mechanical properties such as tensile strength, yield strength, hardness, % elongation and % reduction of WC9-N alloy were examined. It was observed that increasing nitrogen wt. % increases the mechanical properties. The obtained mechanical properties were compared with base WC9 and C12A grade steel, where it was found to be replacement for C12A grade steel at its composition at lower end. The material cost analysis for WC9-N and C12A grade steel was done and both were compared.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1889-1894
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Case Hardened AISI 4130 Steel Using Eddy Current Testing
Autorzy:
Gukendran, R.
Parameshwaran, R.
Ponappa, K.
Powiązania:
https://bibliotekanauki.pl/articles/351982.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AISI 4130
casting defects
annealing
hardness
eddy current testing
Opis:
Casting is the manufacturing process of pouring the hot liquiduos state metal in to the mold cavity and then allowed it to solidify to obtain the final casting. There are many defects are found in the casting components during the inspection. Some defects are tolerated while others are required to repair. Otherwise the casting component is to be eliminated due to the poor quality level. The aim of the non-destructive inspection is to determine, the flaws, discontinuities on the material, and characteristics of the material. Based on the results by non-destructive evaluation the personnel take the decision on the material object is to be accepted or not as per the criteria. In this paper the hardness attribute of the case hardened AISI 4130 steel samples are studied using Vickers Hardness test. Then the hardness property is correlated with the Eddy Current Testing method. According to the acceptance criterion the suitability of the material is analyzed for the corresponding application or not. In this paper Eddy Current Testing response is analyzed for the AISI 4130 samples to determine the mechanical properties of the material. The main objective of the paper is to investigate the effect of the hardness property of the casting material during various case depth obtained via case hardening process. This technique is effective and best practice for the heat treatment shop floors. By this technique the results are investigated based on the cracks and microstructure of the casting material.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1833-1837
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pearlitic Lamellae Spheroidisation During Austenitization and Subsequent Temperature Hold
Autorzy:
Hauserova, D.
Dlouhy, J.
Kover, M.
Powiązania:
https://bibliotekanauki.pl/articles/354933.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Accelerated Spheroidisation and Refinement
annealing
bearing steel
induction heating
Opis:
Typical processing routes for bearing steels include a soft annealing stage. The purpose of this procedure is to obtain a microstructure containing globular carbides in ferritic matrix. A newly developed process called ASR (Accelerated Spheroidisation and Refinement) cuts the carbide spheroidisation times several fold, producing considerably finer globular carbides than conventional soft annealing. Finer microstructure also leads to more homogeneous and finer structure after final hardening process. The present paper explores process of the accelerated spheroidisation (ASR) in steel 100CrMnSi6-4 with initial pearlitic structure. Cementite lamellae morphology was observed in different stages of austenitization. The heat treatment was performed using induction heating in quenching dilatometer. There was analysed influence of austenitization temperature and austenitization time on spheroidisation. Hardness and carbide morphology was observed. Deep etching was used to reveal evolution of cementitic lamellae fragmentation. It is favourable process especially in induction treatment of small parts.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 201-204
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of crystallization on the electrical resistance and structure of amorphous Fe-Co-Cr-B-Si alloys
Wpływ krystalizacji na oporność elektryczną i strukturę amorficznych stopów Fe-Co-Cr-B-Si
Autorzy:
Solomon, H.
Solomon, N.
Powiązania:
https://bibliotekanauki.pl/articles/355840.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
amorphous alloys
X-ray diffraction
electric resistivity
microhardness
annealing
Opis:
The goal of this paper is to present the influence of temperature variation and iron substitution with Co on the structure and electrical properties of amorphous Fe75-xCoxCr1B7Si17 alloys (where x=1, 4, 7, and 10 at.%), obtained by melt-spinning technique. The electrical resistivity of the samples was measured by using a usual four-probe method from -160°C to 750°C. The electrical resistivity was also measured at room temperature for the amorphous Fe75-xCoxCr1B7Si17 ribbons annealed at various temperatures for different holding time. The annealed samples were also investigated by Vickers microhardness test. The amorphous structure of tested materials was examined by X-ray diffraction (XRD), Mőossbauer spectroscopy, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) methods. Experimental results confirmed the utility of applied investigation methods and the influence of the Co content and annealing process on the crystallization, structure and electrical properties of examined amorphous alloys.
Celem niniejszego artykułu jest przedstawienie wpływu zmian temperatury i zastąpienia Fe przez Co na strukturę i właściwości elektryczne amorficznych stopów Fe75-xCoxCr1B7Si17 (gdzie x=1, 4, 7, 10 at.%) odlewanych na wirującym dysku. Oporność elektryczna próbek była mierzona metoda czteropunktowa w zakresie od -160°C to 750°C. Oporność elektryczna zmierzono także w temperaturze pokojowej dla amorficznych taśm Fe75-xCoxCr1B7Si17 wyżarzonych w różnych temperaturach dla różnych czasów. Wyżarzone próbki poddano również badaniom mikrotwardości Vickersa. Amorficzna strukturę badanych materiałów badano przy użyciu dyfrakcji rentgenowskiej (XRD), spektroskopii Mőossbauera, różnicowej kalorymetrii skaningowej (DSC) oraz skaningowej mikroskopii elektronowej (SEM). Wyniki eksperymentu potwierdziły przydatność zastosowanych metod badawczych oraz wpływ zawartości Co i wyżarzania na proces krystalizacji, strukturę i własciwości elektryczne badanych stopów amorficznych.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 4; 1031-1039
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A smart amalgamation of spectral neural algorithm for nonlinear Lane-Emden equations with simulated annealing
Autorzy:
Khan, N. A.
Shaikh, A.
Powiązania:
https://bibliotekanauki.pl/articles/91814.pdf
Data publikacji:
2017
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
Lane-Emden equations
simulated annealing
legendre polynomials
neural network
Opis:
The actual motivation of this paper is to develop a functional link between artificial neural network (ANN) with Legendre polynomials and simulated annealing termed as Legendre simulated annealing neural network (LSANN). To demonstrate the applicability, it is employed to study the nonlinear Lane-Emden singular initial value problem that governs the polytropic and isothermal gas spheres. In LSANN, minimization of error is performed by simulated annealing method while Legendre polynomials are used in hidden layer to control the singularity problem. Many illustrative examples of Lane-Emden type are discussed and results are compared with the formerly used algorithms. As well as with accuracy of results and tranquil implementation it provides the numerical solution over the entire finite domain.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2017, 7, 3; 215-224
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Improved Method of Busbar Voltage Reconstruction from Signals of Electric Field Sensors Installed in an Indoor MV Substation
Autorzy:
Borkowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/220871.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
voltage measurement
signal reconstruction
modelling
parameters identification
simulated annealing
Opis:
This paper presents an improved method for the reconstruction of busbar voltage waveforms from signals acquired by a system of electric field (EF) sensors located in an indoor medium voltage substation. In the previous work [8], the authors proposed the use of black-box models in the form of artificial neural networks (ANNs) for this task. In this paper it is shown that a parametric model of the system of EF sensors can reconstruct voltages with much lower errors, provided that it is accurately identified. The model identification is done by minimization of a nonlinear goal function, i.e. mean squared error (MSE) of voltage reconstruction. As a result of examining several optimization techniques, the method based on simulated annealing extended with a simplex search, is proposed. The performance of the model identified with this method is at least 8 times better in terms of MSE and at least 12 times better in terms of frequency domain errors than the best one of concurrent ANNs.
Źródło:
Metrology and Measurement Systems; 2018, 25, 1; 71-86
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zintegrowany proces otrzymywania monokryształów SI GaAs metodą Czochralskiego z hermetyzacją cieczową
Integrated process of SI GaAs crystals manufacturing by the Liquid Encapsulated Czochralski method
Autorzy:
Hruban, A.
Orłowski, W.
Mirowska, A.
Strzelecka, S.
Piersa, M.
Jurkiewicz-Wegner, E.
Materna, A.
Dalecki, W.
Powiązania:
https://bibliotekanauki.pl/articles/192082.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Tematy:
SI GaAs
obróbka termiczna
EPD
gallium arsenide
LEC thermal annealing
Opis:
Standardowa technologia otrzymywania półizolujących monokryształów SI GaAs składa się z 3 etapów tzn. syntezy, monokrystalizacji i obróbki termicznej, która jest niezbędna dla uzyskania rezystywności ρ ≥ 107 Ohmcm i ruchliwości nośników ładunku μ ≥ 5000 cm2/Vs. Synteza i monokrystalizacja są wykonywane w ramach jednego procesu w wysokociśnieniowym urządzeniu Czochralskiego. Standardowa obróbka termiczna jest procesem osobnym polegającym na wygrzewaniu kryształów w zamkniętych ampułach kwarcowych w atmosferze par As. Proces ten jest pracochłonny, wymaga dodatkowych urządzeń oraz zwiększa koszty. Przedmiotem pracy było uproszczenie technologii wytwarzania monokryształów SI GaAs przez obróbkę cieplną zintegrowaną z procesami syntezy i monokrystalizacji. Przeprowadzono zintegrowane procesy monokrystalizacji i wygrzewania otrzymując monokryształy o średnicach 2" i 3" i ciężarze ~ 3 kg. Własności takich kryształów porównano z monokryształami wytwarzanymi w procesach standardowych. Wykazano, że właściwości fizyczne takie jak: rezystywność, ruchliwość i gęstość dyslokacji nie zależą od sposobu prowadzenia procesu (standardowy, zintegrowany) lecz są tylko funkcją temperatury wygrzewania. Proces zintegrowany upraszcza technologię wytwarzania, a jednocześnie obniża poziom stresów termicznych eliminując pękanie kryształów.
A standard technological process of manufacturing SI GaAs single crystals consists of 3 steps, namely synthesis, crystal growth and thermal annealing, which are necessary to reach high resistivity (ρ ≥ 107 Ohmcm) and high carrier mobility (μ ≥ 5000 cm2/Vs). Usually both synthesis and crystal growth are realized in one process in a high pressure Czochralski puller. The thermal annealing process is carried out in a sealed quartz ampoule under arsenic (As) vapor pressure. This increases the costs of the process due to a need for the equipment and, in addition, is time consuming. The subject matter of this work was the improvement of the SI GaAs technology by integrating the thermal annealing step with synthesis and crystal growth. The integrated manufacturing processes of SI GaAs crystals with 2" and 3" in diameter and ~ 3000 g in weight were performed. Their physical properties were compared with these of the crystals obtained in a standard process. Preliminary results of this work indicate that it is possible to improve the SI GaAs technology and decrease the manufacturing costs. They also prove that thermal stress in the crystals can be decreased, as a result of which cracks will not appear during the mechanical treatment (cutting, lapping).
Źródło:
Materiały Elektroniczne; 2012, T. 40, nr 3, 3; 38-47
0209-0058
Pojawia się w:
Materiały Elektroniczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Assessment of a One-Mass Spring-Based Electromagnetic Energy Harvester on a Vibrating Object
Autorzy:
Chiu, M.-C.
Chang, Y.-C.
Yeh, L.-J.
Chung, C.-H.
Powiązania:
https://bibliotekanauki.pl/articles/177720.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spring
harvester
generator
permanent magnet
simulated annealing
optimization
buckling
Fatigue
Opis:
The paper is an exploration of the optimal design parameters of a space-constrained electromagnetic vibration-based generator. An electromagnetic energy harvester is composed of a coiled polyoxymethylen circular shell, a cylindrical NdFeB magnet, and a pair of helical springs. The magnet is vertically confined between the helical springs that serve as a vibrator. The electrical power connected to the coil is actuated when the energy harvester is vibrated by an external force causing the vibrator to periodically move through the coil. The primary factors of the electrical power generated from the energy harvester include a magnet, a spring, a coil, an excited frequency, an excited amplitude, and a design space. In order to obtain maximal electrical power during the excitation period, it is necessary to set the system’s natural frequency equal to the external forcing frequency. There are ten design factors of the energy harvester including the magnet diameter (Dm), the magnet height (Hm), the system damping ratio (ζsys), the spring diameter (Ds), the diameter of the spring wire (ds), the spring length (ℓs), the pitch of the spring (ps), the spring’s number of revolutions (Ns), the coil diameter (Dc), the diameter of the coil wire (dc), and the coil’s number of revolutions (Nc). Because of the mutual effects of the above factors, searching for the appropriate design parameters within a constrained space is complicated. Concerning their geometric allocation, the above ten design parameters are reduced to four (Dm, Hm, ζsys, and Nc). In order to search for optimal electrical power, the objective function of the electrical power is maximized by adjusting the four design parameters (Dm, Hm, ζsys, and Nc) via the simulated annealing method. Consequently, the optimal design parameters of Dm, Hm, ζsys, and Nc that produce maximum electrical power for an electromagnetic energy harvester are found.
Źródło:
Archives of Acoustics; 2016, 41, 1; 119-131
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of annealing conditions on the properties and microstructure of steel composites
Wpływ warunków wyżarzania na właściwości i mikrostrukturę kompozytów o osnowie stali austenitycznej
Autorzy:
Sulima, I.
Hyjek, P.
Tokarski, T.
Powiązania:
https://bibliotekanauki.pl/articles/264262.pdf
Data publikacji:
2014
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
composites
annealing
properties
diboride titanium
kompozyty
wyżarzanie
właściwości
dwuborek tytanu
Opis:
Samples made of AISI 316L stainless steel reinforced with 8 vol.% TiB2 particles were prepared using the high pressure-high temperature (HP-HT) method. Next, the composites were annealed at a temperature of 1200°C for different holding times. The influence of the annealing temperature and time on the properties and microstructure of AISI316L+8% vol.TiB2 composites was investigated. The structural studies showed the formation of phases containing chromium, molybdenum and boron.
Głównym celem pracy było określenie wpływu temperatury oraz czasu wyżarzania na właściwości i mikrostrukturę kompozytów umacnianych ceramiką TiB2. Proces spiekania materiałów kompozytowych o osnowie stali austenitycznej przeprowadzono przy zastosowaniu spiekania wysokociśnieniowego-wysokotemperaturowego (HP-HT). Kompozyty były wyżarzane w temperaturze 1200°C w różnych czasach. Stwierdzono, że mikrotwardość oraz odporność na ścieranie obniża się już po 30 minutach wyżarzania. Badania mikrostrukturalne wykazały powstanie dużych faz zawierających chrom, molibden oraz bor.
Źródło:
Metallurgy and Foundry Engineering; 2014, 40, 1; 33-43
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kształtowanie struktury i twardości brązu fosforowego UNS C51100 zgniotem i wyżarzaniem
Structure and hardness formation of UNS C51100 phosphor bronze by cold work and annealing
Autorzy:
Szykowny, T.
Romanowski, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/2071825.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
brąz fosforowy
zgniot
rekrystalizowanie
phosphor bronze
cold work
recrystallization
annealing
Opis:
Brąz fosforowy UNS C51100 w postaci pasów o grubości 0,4 mm wyżarzono w temperaturze 600°C. Wyżarzony brąz walcowano na zimno ze zgniotem 20,40,60 lub 80%. Twardość brązu wzrosła od 90 HV do 240 dla Z = 80%. Zgnieciony brąz wyżarzano w temperaturze od 100 do 700°C. Z równania Avrami'ego wyznaczono temperaturę rekrystalizacji, która dla zgniotu 60% wynosi 408°C. Temperatura rekrystalizowania zawiera się przedziale 450 + 500°C. Dalszy wzrost temperatury skutkuje rozrostem ziaren.
UNS C51100 phosphor bronze in a form of 0.4 mm strips was subjected to full annealing at 600°C. The annealed bronze was cold rolled with the cold work of 20,40, 60 and 80%. The bronze hardness increased from 90 to 240 HV for Z = 80%. The cold worked bronze was annealed at the temperatures ranging'from 100 to 700°C. Recrystallization temperature of the bronze was determined using the Avrami equation and ultimately equals 408°C for 60% of cold work. Recrystallization temperature ranged from 450 to 500°C. A further increase in temperature resulted in grain growth.
Źródło:
Inżynieria i Aparatura Chemiczna; 2012, 5; 254-255
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Case Study of Composite Chassis Manufacturing Process Using Low Temperature Molds Tempered with Gradual Heat Annealing Process
Autorzy:
Rządkowski, Witold
Klik, Przemysław
Tracz, Jan
Kowalik, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2201751.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
monocoque
manufacturing
out-of-autoclave
manufacturing process
gradual heat annealing
Opis:
This case study describes a manufacturing process of composite chassis also known as monocoque. The structure is made using carbon fibre reinforced polymers (CFRP) which are manufactured in out-of-autoclave (OOA) process from pre-impregnated carbon fabrics and aluminium alloy honeycomb core. Since the material cost is high the aim of the project was to reduce the cost of manufacturing process i.e. cost of models and moulds. Therefore, instead of high-temp models and moulds a cheaper alternative was used. It consisted of Styrofoam models made using polyurethane (PU) paste and moulds made from CFRP using wet layup process which were cured at room temperature. Such moulds had to be adapted to withstand high temperatures during pre-preg cure. This was done with gradual heat annealing process which increased the maximum service temperature from 45C to 90C. This was enough for the low-temp cure of pre-preg material, but it might be possible to increase the temperature even further. As a result, the cost of manufacturing process had been reduced by 50%.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 12--21
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructural Studies of Ag/TiO2 Thin Film; Effect of Annealing Temperature
Autorzy:
Kamrosni, Abdul Razak
Dewi Suryani, Che Halin
Azliza, Azani
Mohd Mustafa Al Bakri, Abdullah
Mohd Arif Anuar, Mohd Salleh
Norsuria, Mahmed
Chobpattana, Varistha
Kaczmarek, L.
Jeż, Bartłomiej
Nabiałek, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/2048839.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ag/TiO2
annealing temperature
microstructure
optical properties
thin film
Opis:
Microstructures are an important link between materials processing and performance, and microstructure control is essential for any materials processing route where the microstructure plays a major role in determining the properties. In this work, silverdoped titanium dioxide (Ag/TiO2) thin film was prepared by the sol-gel method through the hydrolysis of titanium tetra-isopropoxide and silver nitrate solution. The sol was spin coated on ITO glass substrate to get uniform film followed by annealing process for 2 hours. The obtained films were annealed at different annealing temperatures in the range of 300°C-600°C in order to observe the effect on crystalline state, microstructures and optical properties of Ag/TiO2 thin film. The thin films were characterized by X-Ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis spectrophotometry. It is clearly seen, when the annealing temperature increases to 500°C, a peak at 2θ = 25.30° can be seen which refers to the structure of TiO2 tetragonal anatase. The structure of Ag/TiO2 thin film become denser, linked together, porous and uniformly distributed on the surface and displays the highest cut-off wavelength value which is 396 nm with the lowest band gap value, which is 3.10 eV.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 241-245
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency of selected meta-heuristics applied to the TSP problem: a simulation study
Autorzy:
Kwaśnicka, H.
Powiązania:
https://bibliotekanauki.pl/articles/1931573.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
ant colony
genetic algorithms
simulated annealing
tabu search
neural networks
Opis:
The paper presents a simulation study of the usefulness of a numberof meta-heuristicsused as optimisation methods forTSPproblems. The five considered approaches are outlined: GeneticAlgorithm, Simulated Annealing, Ant Colony System, Tabu Search and Hopfield Neural Network.Using a purpose-developed computer program, efficiency of the meta-heuriticshas been studied andcompared. Results obtained from about 40000 simulation runs are briefly presented and discussed.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 1; 73-91
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular docking-based test for affinities of two ligands toward vasopressin and oxytocin receptors.
Autorzy:
Ślusarz, Rafał
Kaźmierkiewicz, Rajmund
Giełdoń, Artur
Lammek, Bernard
Ciarkowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1044173.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
simulated annealing
bioligand docking
GPCR receptor/bioligand interaction
molecular dynamics
Opis:
Molecular docking simulations are now fast developing area of research. In this work we describe an effective procedure of preparation of the receptor-ligand complexes. The amino-acid residues involved in ligand binding were identified and described.
Źródło:
Acta Biochimica Polonica; 2001, 48, 1; 131-135
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effectiveness of recrystallization high carbon steel with regard to the condition of material
Autorzy:
Grygier, D.
Powiązania:
https://bibliotekanauki.pl/articles/1190026.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
rekrystalizacja
cementyty
stal perlityczna
starzenie
recrystallization
pearlitic steel
annealing
cementite
Opis:
The main aim of the studies presented in paper was to optimize the parameters of the recrystallisation annealing process used in the course of cold plastic working of high carbon steel for patented wires. Object of the research described in the work was eutectoid steel of 0,8% content of C designated for production of colddrawn wires applied for reinforcement of car tires, hoses and ropes. The results of tests show that the condition of the material and mainly degree of plastic deformation has a clearly influence on the effectiveness of pearlitic steel recrystallisation.
Źródło:
Interdisciplinary Journal of Engineering Sciences; 2015, 3, 1; 20--24
2300-5874
Pojawia się w:
Interdisciplinary Journal of Engineering Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hierarchical Multiobjective Routing in MPLS Networks with Two Service Classes - A Meta-Heuristic Solution
Autorzy:
Girao-Silva, R.
Craveirinha, J.
Clímaco, J.
Powiązania:
https://bibliotekanauki.pl/articles/308908.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
multiobjective optimization
MPLS-Internet
routing models
simulated annealing
tabu search
Opis:
The paper begins by reviewing a two-level hierarchical multicriteria routing model for MPLS networks with two service classes (QoS and BE services) and alternative routing, as well as the foundations of a heuristic resolution approach, previously proposed by the authors. Afterwards a new approach, of meta-heuristic nature, based on the introduction of simulated annealing and tabu search techniques, in the structure of the dedicated heuristic, is described. The application of the developed procedures to a benchmarking case study will show that, in certain initial conditions, this approach provides improvements in the final results especially in more "difficult" situations detected through sensitivity analysis.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 3; 20-37
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximating curve by a single segment of B-Spline or Bézier curve directly in CAD environment
Autorzy:
Sobolak, Mariusz
Połowniak, Piotr
Marciniec, Adam
Jagiełowicz, Patrycja Ewa
Powiązania:
https://bibliotekanauki.pl/articles/176192.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bézier curve
curve approximation
design of experiment
algorithms of simulated annealing
Opis:
The paper presents the method of approximating curves with a single segment of the B-Spline and Bézier curves. The method for determining a single curve segment using the optimization methods in the CATIA environment is shown. The algorithms of simulated annealing and design of experiment are used for optimization. For the same purpose, a new original procedure for determining the distance between the given curves using explicit parameters in the CATIA environment was also used. This approximation of the cyclic curves results in the curve oscillation as shown in the examples. The results show that the approximation method with Bézier curve using control points as “free” points can be applied to obtain the best results of approximation.
Źródło:
Advances in Manufacturing Science and Technology; 2020, 44, 3; 84-92
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiphase Ausformed Austempered Ductile Iron
Autorzy:
Soliman, M.
Palkowski, H.
Nofal, A.
Powiązania:
https://bibliotekanauki.pl/articles/356310.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ductile iron
thermo-mechanical processing
dual matrix
austempering
ausforming
intercritical annealing
Opis:
Ductile iron was subjected to a total true strain (φt) of 0.3 either by applying φt in the austenite region or by apportioning it through applying a true strain of 0.2 in the austenite region before quenching to austempering temperature (TA) of 375°C, where a true strain of 0.1 is applied (ausforming). Additionally, two types of matrices were produced in the ductile iron, namely ausferritic and ferritic-ausferritic matrices. The ferrite is introduced to the matrix by intercritical annealing after austenitization. Dilatometric measurements as well as microstructure examination showed a fast ausferrite transformation directly after applying φA and that the introduction of ferrite to the matrix resulted in a remarkable acceleration of the ausferrite formation. The transformation kinetics, microstructure evolution, hardness and compression properties are studied.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1493-1498
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal annealing of soft magnetic materials and measurements of its magnetoelastic properties
Wyżarzanie materiałów magnetycznie miękkich i metody badania ich właściwości magnetosprężystych
Autorzy:
Szewczyk, R.
Bieńkowski, A.
Salach, J.
Jackiewicz, D.
Švec Sr, P.
Hasko, J.
Švec, P.
Kamiński, M.
Winiarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/276803.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
materiały magnetycznie miękkie
wyżarzanie
soft magnetic materials
thermal annealing
magnetoelastic properties
Opis:
Paper presents both methods of the most advanced thermal annealing as well as available methods of testing the magnetoelastic properties of soft magnetic materials for technical applications. Selected features and conditions important for annealing of ring-shaped cores made of the magnetoelastic amorphous ribbons are described and an example of thermomagnetic processing is shown. Unified methodologies for testing of magnetoelastic properties of the frame-shaped and the ringshaped cores, for both compressive and tensile stresses are presented.
W referacie przedstawiono zarówno nową metodę relaksacji termicznej w materiałach magnetycznie miękkich, jak i metody pomiaru charakterystyk magnetosprężystych w tych magnetykach. W referacie przedstawiono także wybrane wyniki pomiaru wpływu procesu relaksacji termicznej w obecności pola magnetycznego na charakterystyki magnesowania stopów amorficznych, jak również wyniki pomiaru charakterystyk magnetosprężystych. Należy podkreślić, że z wykorzystaniem przedstawionej w pracy metodyki możliwy jest pomiar charakterystyk magnetomechanicznych zarówno w zakresie naprężeń ściskających, jak i rozciągających.
Źródło:
Pomiary Automatyka Robotyka; 2013, 17, 2; 513-518
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Searching for an Efficient System of Equations Defining the AES Sbox for the QUBO Problem
Autorzy:
Burek, Elżbieta
Mańk, Krzysztof
Wroński, Michał
Powiązania:
https://bibliotekanauki.pl/articles/27312952.pdf
Data publikacji:
2023
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
AES Sbox
cryptanalysis
minimal equation system for Sbox
quantum annealing
QUBO
Opis:
The time complexity of solving the QUBO problem depends mainly on the number of logical variables in the problem. This paper focuses mainly on finding a system of equations that uniquely defines the Sbox of the AES cipher and simultaneously allows us to obtain the smallest known optimization problem in the QUBO form for the algebraic attack on the AES cipher. A novel method of searching for an efficient system of equations using linear-feedback shift registers has been presented in order to perform that task efficiently. Transformation of the AES cipher to the QUBO problem, using the identified efficient system, is presented in this paper as well. This method allows us to reduce the target QUBO problem for AES- 128 by almost 500 logical variables, compared to our previous results, and allows us to perform the algebraic attack using quantum annealing four times faster.
Źródło:
Journal of Telecommunications and Information Technology; 2023, 4; 30--37
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical studies of binding modes of two covalent inhibitors of cysteine proteases.
Autorzy:
Drabik, Piotr
Politowska, Ewa
Czaplewski, Cezary
Kasprzykowski, Franciszek
Łankiewicz, Leszek
Ciarkowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1044228.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
cysteine proteases
covalent protease inhibitors
constrained simulated annealing
papain
molecular dynamics
Opis:
Physiological and pathological roles of cysteine proteases make them important targets for inhibitor development. Although highly potent inhibitors of this group of enzymes are known, their major drawback is a lack of sufficient specificity. Two cysteine protease covalent inhibitors, viz. (i) Z-RL-deoxo-V-peptide-epoxysuccinyl hybrid, and (ii) Z-RLVG-methyl-, have been developed and modeled in the catalytic pocket of papain, an archetypal thiol protease. A number of configurations have been generated and relaxed for each system using the AMBER force field. The catalytic pockets S3 and S4 appear rather elusive in view of the observed inhibitors' flexibility. This suggest rather limited chances for the development of selective structure-based inhibitors of thiol proteases, designed to exploit differences in the structure of catalytic pockets of various members of this family.
Źródło:
Acta Biochimica Polonica; 2000, 47, 4; 1061-1066
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature dependent electrical characteristics of Nichrome/4H-SiC Schottky barrier diodes
Autorzy:
Khanna, Shaweta
Noor, A.
Powiązania:
https://bibliotekanauki.pl/articles/1076274.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Nichrome
Schottky Diodes
Schottky barrier height
ideality factor
rapid thermal annealing
Opis:
Nichrome Schottky barrier diodes have been fabricated on 4H-SiC substrates to investigate the temperature dependant electrical characteristics of the fabricated contacts. The electrical parameters such as barrier height, ideality factor and donor concentration were found from the current-voltage (I-V) and the capacitance-voltage (C-V) measurements at room temperature. Barrier Contacts showed non-ideal behaviour like lower value of barrier height and high value of ideality factor. A barrier height of 1.53eV obtained from C-V measurements and 0.79eV obtained from the I-V measurements with ideality factor of 1.96 for as-deposited diodes at room temperature. The diodes, therefore, were annealed in the temperature range from 25-400 ºC to see the effect of annealing temperature on these parameters. Schottky barrier height (SBH) and ideality factors were found temperature dependent. After rapid thermal annealing (RTA) upto 400 ºC barrier height of 1.27 eV from C-V measurements and the value of 1.13 eV were obtained from I-V measurements with ideality factor of 1.12. Since barrier height deduced from C-V measurements were consistently larger than those from I-V measurements. To remove this discrepancy we re-examined our results by including the effect of ideality factor in the expression of the saturation current. The insertion of ideality factor results in comparably good agreement between the values of barrier height derived by above two methods. We believe that the enhancement in the electrical parameters result from the improvement in the quality of interfacial layer.
Źródło:
World Scientific News; 2019, 116; 169-179
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System for vehicle routing problem algorithms analysis
System do analizy algorytmów planowania dostaw
Autorzy:
Sztajerowski, W.
Ochelska-Mierzejewska, J.
Kucharski, J.
Powiązania:
https://bibliotekanauki.pl/articles/408535.pdf
Data publikacji:
2017
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
vehicle routing problem
simulated annealing
optimization
planowanie dostaw
symulowane wyżarzanie
optymalizacja
Opis:
Paper concerns the software system supporting the analysis of different cases of solving VRP by various algorithms. VRP has been characterised and application structure has been presented. Illustrative experimental results show the usefulness of the system.
Artykuł przedstawia oprogramowanie wspomagające analizę różnych przypadków rozwiązywania planowania dostaw (ang. Vehicle Routing Problem, VRP) przez różne algorytmy. Zaprezentowano w artykule problem VRP oraz strukturę omawianego systemu. Pokazano również wyniki eksperymentów, które pokazują użyteczność systemu.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 2; 28-31
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiobjective Approach to Localization in Wireless Sensor Networks
Autorzy:
Marks, M.
Niewiadomska-Szynkiewicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/309060.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
ad hoc networks
localization
simulated annealing
stochastic optimization
wireless sensor network
Opis:
Wireless sensor network localization is a complex problem that can be solved using different types of methods and algorithms. Nowadays, it is a popular research topic. What becomes obvious is that there are several criteria which are essential when we consider wireless sensor networks. Our objective is to determine accurate estimates of nodes location under the constraints for hardware cost, energy consumption and computation capabilities. In this paper the application of stochastic optimization for performing localization of nodes is discussed. We describe two phase scheme that uses a combination of the trilateration method, along with the simulated annealing optimization algorithm. We investigate two variants of our technique, i.e., centralized and distributed. The attention is paid to the convergence of our algorithm for different network topologies and trade-off between its efficiency and localization accuracy.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 3; 59-67
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sequential simulated annealing for the vehicle routing problem with time windows
Autorzy:
Woch, M.
Łebkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/375944.pdf
Data publikacji:
2009
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
simulated annealing
vehicle routing problem with time windows
bi-criterion optimization
Opis:
This article presents a new simulated annealing algorithm that provides very high quality solutions to the vehicle routing problem. The aim of described algorithm is to solve the vehicle routing problem with time windows. The tests were carried out with use of some well known instances of the problem defined by M. Solomon. The empirical evidence indicates that simulated annealing can be successfully applied to bi-criterion optimization problems.
Źródło:
Decision Making in Manufacturing and Services; 2009, 3, 1-2; 87-100
1896-8325
2300-7087
Pojawia się w:
Decision Making in Manufacturing and Services
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Shape optimization of road tunnel cross-section by simulated annealing
Autorzy:
Sobótka, M.
Pachnicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/178948.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
simulated annealing
underground excavation
shape optimization
linear elasticity
energy of volumetric strain
Opis:
The paper concerns shape optimization of a tunnel excavation cross-section. The study incorporates optimization procedure of the simulated annealing (SA). The form of a cost function derives from the energetic optimality condition, formulated in the authors’ previous papers. The utilized algorithm takes advantage of the optimization procedure already published by the authors. Unlike other approaches presented in literature, the one introduced in this paper takes into consideration a practical requirement of preserving fixed clearance gauge. Itasca Flac software is utilized in numerical examples. The optimal excavation shapes are determined for five different in situ stress ratios. This factor significantly affects the optimal topology of excavation. The resulting shapes are elongated in the direction of a principal stress greater value. Moreover, the obtained optimal shapes have smooth contours circumscribing the gauge.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 2; 47-52
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ obróbki termicznej na własności niedomieszkowanych monokryształów GaP
Annealing influence on the electrical properties of GaP single crystals
Autorzy:
Strzelecka, S.
Hruban, A.
Jurkiewicz-Wegner, E.
Piersa, M.
Orłowski, W.
Surma, B.
Powiązania:
https://bibliotekanauki.pl/articles/192036.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
Tematy:
GaP
obróbka termiczna
materiał półizolujący
własności elektryczne
annealing
SI crystal
electrical properties
Opis:
Zbadano wpływ procesów wygrzewania na własności niedomieszkowanych monokryształów fosforku galu (GaP) otrzymanych z wsadów o różnym składzie chemicznym: bliskim stechiometrii, z nadmiarem galu lub z nadmiarem fosforu, a także o różnej koncentracji węgla. Procesom wygrzewania poddano bloki monokryształów o grubości 10-20 mm oraz płytki o grubości ∼ 700 μm. Określono warunki obróbki termicznej takie jak temperatura i czas wygrzewania oraz ciśnienie par fosforu w ampule pozwalające na otrzymanie materiału półizolujacego. Stwierdzono, że w przypadku monokryształów GaP typu n o koncentracji nośników ładunku n = (2 - 5) × 10^16 cm-³ i koncentracji węgla Nc ≤ 1 × 10^16 cm-³ w wyniku wygrzewania można otrzymać materiał półizolujący typu n. Przy koncentracji węgla Nc ∼ 5 × 10^16 cm-³ otrzymywany jest materiał półizolujący typu p.
Influence of annealing conditions on the properties of undoped gallium phosphide crystals obtained from the melt: near stoichiometric, with gallium excess or phosphorus excess, as well as with different carbon concentration was investigated. Monocrystalline blocks with a thickness of 10 - 20 mm and wafers with a thickness of ∼ 700 urn were annealed. Annealing conditions such as the temperature, time and phosphorus vapor pressure in the ampoule allowing for obtaining semi-insulating material, were determined. It was confirmed that as result of annealing undoped GaP crystals with the carrier concentration n = (2 - 5) × 10^16 cm-³ and carbon concentration Nc ≤ 1 × 10^16 cm-³ we can obtain SI n - type material. At the carbon concentration Nc ∼ 5 × 10^16 cm-³ the SI material of p - type can be obtained.
Źródło:
Materiały Elektroniczne; 2009, T. 37, nr 2, 2; 27-38
0209-0058
Pojawia się w:
Materiały Elektroniczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diversification of Intermetallic Zn Phases Growth on Steel During Hot-Dip Galvanizing
Autorzy:
Węgrzynkiewicz, S.
Jędrzejczyk, D.
Szłapa, I.
Hajduga, M.
Boczkal, S.
Powiązania:
https://bibliotekanauki.pl/articles/352256.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot-dip zinc galvanizing
heat-affected zone
softening annealing
oxy-acetylene cutting
Opis:
The steel substrate formed as the result of oxy-acetylene cutting (OAB) was treated differently - using: softening annealing, grinding and electro-polishing. Investigations were focused on the influence of additional processing on the structure and corrosion resistance of the deposited zinc coating. The hot - dip Zn galvanizing process was conducted in industrial conditions. Parameters were fixed: temperature 457 °C, dipping time 150 s. The coating thickness diversification dependent on the sub-surface steel structure was analysed and compared to the previous results. The correlation between conducted treatment and coatings morphology was determined.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 515-520
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-isothermal annealing of AA7075 aluminum alloy - structural and mechanical effects
Nieizotermiczne wyżarzanie stopu aluminium AA7075 - efekty strukturalne i mechaniczne
Autorzy:
Pieła, K.
Błaż, L.
Sierpiński, Z.
Foryś, T.
Powiązania:
https://bibliotekanauki.pl/articles/354234.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nieizotermiczne wyżarzanie
stopy aluminium
wytrzymałość cieplna
aluminum alloy
annealing
thermal treatment
structure
Opis:
Calorimetric and dilatometric tests were performed on AA7075 aluminum alloy annealed at constant heating rate of 15 degree Celsjus/min in temperature range 20-470 degree Celsjus and discussed in relation to the hardness test and structure observation results. The samples were machined from furnace cooled material (FC), furnace cooled and deformed (FCD) material, solution treated (ST) material and solution treated and deformed (STD) material. It was found that the nucleation and growth of transition η and stable η (MgZn2) phases caused remarkable reduction of thermal expansion coefficient αt , whereas both the dissolution of phase and formation of GP zones were accompanied by an increase of αt value. While η phase started to dissolve at 250 degree Celsjus, a widespread endothermic effect was observed on DSC curves. Dissolution of η particles at high annealing temperatures was accompanied by the solid solution hardening of the alloy. Mentioned hardening process was overlapped by expected material softening that was ascribed to recovery and recrystallization processes. Because of superposition the solution hardening and recrystallization softening, recrystallization temperature could not be precisely defined on the basis of simple hardness measurements.
W pracy przedstawiono wyniki badań kalorymetrycznych, dylatometrycznych i pomiarów twardości stopu aluminium AA7075 poddanego nieizotermicznemu wyżarzaniu (nagrzewaniu ze stała prędkością) w zakresie temperatur 20-470 stopni Celsjusza. Badania objęły cztery stany metalurgiczne materiału: wolno studzony z piecem (FC), wolno studzony z piecem i odkształcony (FCD), przesycony (ST) oraz przesycony i odkształcony (STD). Stwierdzono, ze wydzielanie fazy pośredniej η' i równowagowej η(MgZn2) powoduje wyraźne obniżenie współczynnika rozszerzalności cieplnej αt , natomiast zarówno rozpuszczanie fazy η, jak i formowanie stref GP prowadzi do jego wzrostu. Rozpuszczanie fazy η rozpoczyna sie w temperaturze 250 stopni Celsjusza i towarzyszy mu rozległy efekt endotermiczny, a w zaawansowanym stadium rozpuszczania η także wzrost twardości przesycanych próbek, będący rezultatem umocnienia roztworowego stopu. Umocnienie roztworowe zakłóca tym samym efekt oczekiwanego mięknięcia materiału wskutek rekrystalizacji, co w konsekwencji utrudnia dokładna ocenę temperaturowego zakresu rekrystalizacji w oparciu o pomiary twardości.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 3; 703-709
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stochastic Neural Networks for Feasibility Checking
Autorzy:
Strausz, G.
Powiązania:
https://bibliotekanauki.pl/articles/908272.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
optymalizacja
sieć neuronowa
aproksymacja
optimization
neural networks
simulated annealing
mean-field approximation
Opis:
Complex diagnosis problems, defined by high-level models, often lead to constraint-based discrete optimization tasks. A logical description of large, complex systems usually contains numerous variables. The first test of the logical description is typically to check the feasibility in order to know that there is no contradiction in the model. This can be formulated as an optimization problem and methods of discrete optimization theory can then be used. The purpose of the paper is to show that stochastic neural networks can be applied to this type of tasks and the networks are efficient tools for finding feasible or good-quality configurations. Boltzmann and mean-field neural networks were tested on large-sized complex problems.The paper presents simulation results obtained from a real application task and compares the performance of the neural networks being examined.
Źródło:
International Journal of Applied Mathematics and Computer Science; 1999, 9, 4; 921-937
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Change In Microstructure and Mechanical Properties Of Four-Layer Stack ARB Processed Complex Aluminum Sheet with Annealing
Autorzy:
Jo, Sang-Hyeon
Lee, Seong-Hee
Powiązania:
https://bibliotekanauki.pl/articles/2049296.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
accumulative roll bonding
heterogeneous microstructure
aluminum alloy
electron back scatter diffraction
annealing
Opis:
The four-layer stack accumulative roll bonding (ARB) process using AA1050, AA5052 and AA6061 alloy sheets is performed up to 2 cycles without a lubricant at room temperature. The sample fabricated by the ARB is a multi-layer complex aluminum alloy sheet in which the AA1050, AA5052 and AA6061 alloys are alternately stacked to each other. The changes of microstructure and mechanical properties with annealing for the-ARBed aluminum sheet are investigated in detail. The as-ARBed sheet shows an ultrafine grained structure, however the grain diameter is some different depending on the kind of aluminum alloys. The complex aluminum alloy still shows ultrafine structure up to annealing temperature of 250℃, but above 275℃ it exhibits a heterogeneous structure containing both the ultrafine grains and the coarse grains due to an occurrence of discontinuous recrystallization. This change in microstructure with annealing also has an effect on the change of the mechanical properties of the sample. Especially, the specimen annealed at 300℃ represents abnormal values for the strength coefficient K and work hardening exponent n value.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 765-770
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Professor Ryszard Zielińskis contribution to Monte Carlo methods and random number generators. Uniform asymptotics in statistics
Autorzy:
Niemiro, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/747651.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
stochastic optimization, simulated annealing, random number generator, uniform limit theorems, uniform consistency
Opis:
Omawiamy dwa ważne wycinki działalności naukowej Ryszarda Zielińskiego. Po pierwsze, są to prace związane z metodami Monte Carlo. Wiele z nich dotyczyła stochastycznych metod optymalizacji. Ryszard Zieliński badał algorytmy typu stochastycznej aproksymacji i poszukiwań losowych. Interesował się zagadnieniami optymalizacji globalnej. Podkreślamy wątek traktowania zadań obliczeniowych w sposób właściwy dla statystyki matematycznej. Wspominamy również o relacji algorytmów typu „symulowanego wyżarzania” z wcześniejszymi wynikami Zielińskiego. Odrębny rozdział stanowią prace na temat generatorów losowych. Ryszard Zieliński zaproponował i badał generator wytwarzający nieokresowy ciąg liczb pseudo-losowych.Inny nurt badań Ryszarda Zielińskiego dotyczy jednostajnych twierdzeń granicznych w statystyce. Motywacja jest związana z podkreślaną przez Zielińskiego metodologią statystyki jako nauki dedukcyjnej rozwijanej na potrzeby zastosowań. Zieliński badał, w których modelachstatystycznych Prawo Wielkich Liczb i Centralne Twierdzenie Graniczne zachodzi jednostajnie względem rozważanej rodziny rozkładów prawdopodobieństwa. Rozstrzygnął pytanie o jednostajną zgodność kwantyli próbkowych. Wykazał, jak można osiągnąć jednostajną zgod-ność wygładzonej dystrybuanty empirycznej, dowodząc odpowiednik nierówności Dvoretzky’ego-Kiefera-Wolfowitza.
The aim of the paper is to summarize contributions of Ryszard Zieliński to two important areas of research. First, we discuss his work related to Monte Carlo methods. Ryszard Zieliński was particularly interested in Monte Carlo optimization. About 10 of his papers concerned stochastic algorithms for seeking extrema. He examined methods related to stochastic approximation, random search and global optimization. We stress that Zielinski often considered computational problems from a statistical perspective. In several articles he explicitly indicated that optimization can be reformulated as a statistical estimation problem. We also discuss relation between the family of Simulated Annealing algorithms on the one hand and some procedures examined earlier by Ryszard Zieliński on the other. Another topic belonging to Monte Carlo methods, in which Ryszard Zieliński has achieved interesting results, is construction of random number generators and examination of their statistical properties. Zieliński proposed an aperiodic generator based on Weil sequences and showed how it can be efficiently implemented. Later he constructed an algorithm which uses several such generators and produces pseudo-random sequences with better statistical properties.The second area of Zieliński’s work discussed here is related to uniform limit theorems of mathematical statistics. We stress the methodological motivation behind the research in this direction. In Zieliński’s view, asymptotic results should hold uniformly with respect to the family of probability distributions under consideration. In his opinion, this requirement comes from the very nature of statistical models and the needs of practical applications. Zieliński examined uniform versions the Weak Law of Large Numbers, Strong Law of Large Numbers and Central Limit Theorem in several statistical models. Some results were rather unexpected. He also gave a necessary and sufficient condition for uniform consistency of sample quantiles. Two papers of Ryszard Zieliński were devoted to uniform consistency of smoothed versions of empirical cumulative distribution function. In one of them he proved a version of Dvoretzky-Kiefer-Wolfowitz inequality.
Źródło:
Mathematica Applicanda; 2012, 40, 2
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Screen keyboard arrangement optimization for polish language
Optymalizacja układu klawiatury ekranowej dla języka polskiego
Autorzy:
Wołosik, M.
Tabędzki, M.
Powiązania:
https://bibliotekanauki.pl/articles/88388.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
optymalizacja
klawiatura
algorytmy genetyczne
wyżarzanie symulowane
keyboard arrangement problem
genetic algorithms
simulated annealing
Opis:
The aim of this work was to find screen keyboard arrangement optimal for Polish language. This study adopted a standard shape and organization of the keyboard, the task is therefore only for identifying the best permutations of keys. Only the alphabet keys and five selected punctuation marks were permutated. In order to accomplish this task, machine learning methods were used: genetic algorithms and simulated annealing. Fitness function is based on two literary works and one technical document. The following criteria were used: of distance, the writing direction and row weights. The application prepared for the experiments was developed in Java. The paper describes used algorithms and obtained results. Best found arrangement would shorten the time to input sample texts by about 30% (assuming adequate accustom of the new layout by the writer).
Celem niniejszej pracy było opracowanie układu klawiatury ekranowej przeznaczonej dla języka polskiego. Przyjęto standardowy kształt i organizację klawiatury, zatem jest to zadanie wskazania najlepszej permutacji klawiszy, przy czym permutacji podlegały jedynie klawisze znaków alfabetu oraz pięć wybranych znaków interpunkcyjnych. W celu realizacji tak określonego zadania, posłużono się metodami uczenia maszynowego: algorytmami genetycznymi oraz algorytmem symulowanego wyżarzania. Funkcja dopasowania opiera się na dwóch utworach literackich oraz jednym dokumencie technicznym. Zastosowano kryteria odległości oraz lokalizacji klawiszy (biorąc pod uwagę kierunek pisania oraz wagi rzędów). Aplikację przygotowaną w celu wykonania badan eksperymentalnych opracowano w języku Java. W pracy opisano zastosowane algorytmy oraz przedstawiono wyniki uzyskane na drodze eksperymentów. Najlepsze znalezione układy pozwoliłyby skrócić czas ´ wprowadzania przykładowych tekstów o około 30% (zakładając odpowiednie opanowanie nowego układu przez piszącego).
Źródło:
Advances in Computer Science Research; 2016, 13; 75-93
2300-715X
Pojawia się w:
Advances in Computer Science Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of thermal annealing on structure and oxidation of iron nanowires
Autorzy:
Krajewski, M.
Brzózka, K.
Górka, B.
Lin, W.-S.
Lin, H. -M.
Szumiata, T
Gawroński, M.
Wasik, D.
Powiązania:
https://bibliotekanauki.pl/articles/148838.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
amorphous iron and iron oxides
iron nanowires
Mössbauer spectroscopy
Raman spectroscopy
thermal annealing
Opis:
Raman spectroscopy as well as Mössbauer spectroscopy were applied in order to study the phase composition of iron nanowires and its changes, caused by annealing in a neutral atmosphere at several temperatures ranging from 200°C to 800°C. As-prepared nanowires were manufactured via a simple chemical reduction in an external magnetic fi eld. Both experimental techniques proved formation of the surface layer covered by crystalline iron oxides, with phase composition dependent on the annealing temperature (Ta). At higher Ta, hematite was the dominant phase in the nanowires.
Źródło:
Nukleonika; 2015, 60, 1; 87-91
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Criteria 3-Dimension Bin Packing Problem
Autorzy:
Kacprzak, Ł.
Rudy, J.
Żelazny, D.
Powiązania:
https://bibliotekanauki.pl/articles/409522.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
bin packing problem
multi-criteria
genetic algorithm
simulated annealing
discrete optimization
Pareto efficiency
Opis:
In this paper a multi-criteria approach to the 3-dimensions bin packing problem is considered. The chosen maximization criteria are the number and the total volume of the boxes loaded into the container. Existing solution representation and decoding method are applied to the problem. Next, two metaheuristic algorithms, namely simulated annealing and genetic algorithm are developed using the TOPSIS method for solution evaluation. Both algorithms are then used to obtain approximations of the Pareto front for a set of benchmarks from the literature. Despite the fact that both criteria work in favor of each other, we managed to obtain multiple solutions in many cases, proving that lesser number of boxes can lead to better utilization of the container volume and vice versa. We also observed, that the genetic algorithms performs slightly better in our test both in the terms of hyper-volume indicator and number of non-dominated solutions.
Źródło:
Research in Logistics & Production; 2015, 5, 1; 85-94
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combining SMT and Simulated Annealing into a Hybrid Planning Method
Autorzy:
Skaruz, J.
Niewiadomski, A.
Penczek, W.
Powiązania:
https://bibliotekanauki.pl/articles/92934.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
concrete planning
genetic algorithm
satisfiability modulo theories
simulated annealing
web service composition
planics
Opis:
We present a new approach to the concrete planning (CP) - a stage of theWeb service composition in the PlanICS framework. A new hybrid algorithm (HSA) based on a combination of Simulated Annealing (SA) with Satisfiability Modulo Theories (SMT) has been designed and implemented. The main idea of our hybrid solution is to use an SMT-based procedure in order to generate an initial individual and then improve it during subsequent iterations of SA. The experimental results show that HSA is superior to the other methods we have applied to the CP problem, including Genetic Algorithm, an SMT-based approach, and our previously developed hybrids.
Źródło:
Studia Informatica : systems and information technology; 2015, 1-2(19); 43-48
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes In Properties and Microstructure of High-Chromium 9-12%Cr Steels Due to Long-Term Exposure at Elevated Temperature
Autorzy:
Zieliński, A.
Dobrzański, J.
Purzyńska, H.
Golański, G.
Powiązania:
https://bibliotekanauki.pl/articles/351104.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steel P91
P92
VM12
microstructure
mechanical properties
long-term annealing
Opis:
This paper presents the characteristics of the performance of P91 (X10CrMoVNb9-1), P92 (X10CrWMoVNb9-2) and VM12 (X12CrCoWVNb12-2-2) steels used for condition assessment of the pressure components of boilers with supercritical steam parameters. Studies on the mechanical properties, microstructure tests using scanning and transmission electron microscopy, and X-ray analysis of the phase composition of precipitates were performed for selected steels in the as-received condition and after long-term annealing. These steel characteristics are used for the evaluation of the microstructural changes and mechanical properties of the material of components after long-term service. The result of this study is the database of material characteristics representing the mechanical properties related to the microstructure analysis and it can be used for diagnosis of the components of pressure parts of power boilers.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 957-964
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Kinetic of Al3Ti Phase Growth in Explosively Welded Multilayered Al/Ti Clads during Annealing under Load Conditions
Autorzy:
Petrzak, P.
Mania, I.
Paul, H.
Maj, Ł.
Gałka, A.
Powiązania:
https://bibliotekanauki.pl/articles/356880.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
explosive welding
annealing under compression
Al/Ti multilayered composites
Al3Ti phase
Opis:
Multilayered composites based on light metals are promising materials in many applications. In the present work the 15-layered clad, composed of alternately stacked of Ti(Gr.1) and AA1050-H24 alloy sheets of 1 mm thick has been investigated with respect to determination of the kinetic of the Al3Ti phase growth. The defect-free multilayered composite was successfully formed by explosive welding technology. Then EXW samples were modified via annealing at the temperature of 600°C in closed die under pressure of 44 MPa for various times ranged between 1 and 10 h. Transmission and Scanning Electron Microscopy examinations were conducted in order to study the kinetic of the elements migration across the interfaces between the layers of the Al/Ti composite. The macro-scale observations of samples after EXW revealed that wavy interfaces were always formed in layers near the explosive charge. The increase of the distance from the top surface leads to flattening of the interface with very thin reaction layer between Al and Ti sheets. During annealing the kinetic of the Al3Ti phase growth is similar near all interfaces and coincides with data from other works. It was found that despite the loading after 10 h of annealing still only small part of Al-sheets undergoes dissolution and the width of the reaction layer does not exceed 5-8 μm.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 4; 1549-1554
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation method in talc raw material processing from the Gemerská Poloma deposit in Slovakia
Metoda flotacyjna w przeróbce kopaliny talkowej ze złoża Gemerská Poloma na Słowacji
Autorzy:
Sidorová, M.
Čorej, P.
Powiązania:
https://bibliotekanauki.pl/articles/216249.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
białość talku
strata prażenia
pozostałość nierozpuszczalna
flotacja
talc
whiteness
annealing loss
insoluble residue
floating
Opis:
Artykuł przedstawia przydatność metody flotacyjnej w przeróbce kopaliny talkowej pochodzącej ze złoża Gemerská Poloma. Wnioski oparte są na analizie wyników badań kontrolowanych próbek materiału z prób produkcyjnych, które zostały przeprowadzone w dwóch instalacjach flotacyjnych. Ocena wyników tych prób przemysłowych, w tym analizy chemicznej i innych analiz jakościowych przeprowadzonych na próbkach kontrolnych, potwierdzają stosunkowo wysoki poziom białości – w zakresie od 83,9–88,0% – w otrzymanych koncentratach talku. Wiadomo jednak, że surowiec talkowy osiągnie swój ostateczny poziom białości po jego zmieleniu do docelowej granulacji. Badania potwierdzają również wysoką skuteczność separacji pirytu i innych minerałów towarzyszących w trakcie flotacji. Na podstawie wyników analizy chemicznej koncentratów talku, uzasadnione jest stwierdzenie, że metoda flotacji może być uznana za odpowiednią metodę wzbogacania kopaliny talkowej pochodzącej ze złoża Gemerská Poloma. Złoże talku Gemerská Poloma zostało udokumentowane pod koniec lat dziewięćdziesiątych XX wieku. W 1988 roku podczas badań geologicznych w rejonie Gemerská Poloma na końcu doliny Dlhá, w wyniku przeprowadzonych prac wiertniczych (3 otwory) stwierdzono mineralizację talkowo-magnezytową. Unikalne złoże talku może mieć duże znaczenie na rynku europejskim, będąc porównywalnym do największych światowych złóż tej kopaliny. Eksperci uważają złoże talku Gemerská Poloma pod względem wymiarów, jakości kopaliny i ilości zasobów, jako jedno z największych na świecie. Jego kluczową zaletą jest dobre strategiczne położenie w centrum Europy. Oceny ekonomiczne tego złoża dają perspektywę długoletniej zyskownej działalności produkcyjnej, a działalność ta może także częściowo ożywić górniczo-geologiczny rynek pracy w tym regionie. Popyt na ten surowiec w Europie ma stałą tendencję wzrostową.
This article describes the suitability of the flotation method in the processing of talc raw material from the Gemerská Poloma deposit. The conclusions are based on the analysis of test results of controlled material samples from plant trials that were conducted in two flotation facilities. The evaluation of the results of the trial runs, chemical analysis, and other analyses conducted on the control mineral samples confirmed relatively high levels in the range between 83.9–88% of whiteness in the sample mineral concentrate. However, it is known that the talc will reach its final level of whiteness after it is ground into more refined particles. The trials also confirmed high effectiveness of separation of pyrite and other accompanying minerals. Based on the results of the chemical analysis of the concentrates, it is safe to conclude that the flotation method can be deemed suitable for the enriching of talc extracted from the Gemerská Poloma deposit. The talc deposit at Gemerská Poloma was already identified in the late 90s. In 1988 during geological surveys in Gemerská Poloma at the end of Dlhá Valley, talc magnesite mineralization was found by three drillings. A unique talc deposit was verified of European significance comparable to the largest global deposits by its. Experts regard the Gemerské talc deposit in terms of its dimensions, quality, and quantity as one of the most important in the world. Its key advantage is a good strategic location in the centre of Europe. The economic prospects of this deposit are estimated to offer many years of potential benefits which will partly revive the labour market for the mining-geological specialisation. Demand for this industrial mineral in Europe has an increasing tendency.
Źródło:
Gospodarka Surowcami Mineralnymi; 2013, 29, 3; 37-46
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the properties of HAp micropowders after ion exchange process in silver nitrate solution
Autorzy:
Głuszek, Marta
Świrska, Zuzanna
Kaczorowski, Witold
Januszewicz, Bartłomiej
Wrotniak, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2058388.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
hydroxyapatite
ion exchange
silver nitrate (V)
annealing
XRD
Raman spectroscopy
hydroksyapatyt
wymiana jonowa
spektroskopia
Opis:
Bioceramic materials, such as hydroxyapatite (HAp), are characterized by high biocompatibility in the presence of tissues and body fluids without causing toxic or allergic reactions. Hydroxyapatite, due to its similarity to structures found in bones, is used both in the form of powders, e.g. as additives to bone cements, and implants coatings. However, this material is not characterized by antimicrobial properties, therefore attempts are made to improve its properties by introducing additional elements into the hydroxyapatite structure. Thanks to HAp’s high ion-exchange ability, silver can be introduced into its structure. The calcium ions present in the HAp structure can be easily replaced by silver ions to create a material endowed with high biocompatibility and antibacterial properties. The presented study is based on the analysis of the morphology of the modified powders via scanning electron microscopy (SEM), their chemical composition via X-ray energy dispersive spectroscopy (EDS) and chemical structure via X-ray diffraction (XRD) and Raman spectroscopy. The powders obtained through the ion exchange were mixtures of silver phosphates Ag3PO4 and HAp. The highest silver content was found in the sample modified with a 1M concentration of AgNO3 in the aqueous solution. It was also determined that the annealing of the obtained powders under vacuum at 800°C resulted in the formation of metallic silver and a change in the structure of HAp to β-TCP.
Źródło:
Engineering of Biomaterials; 2021, 24, 161; 15--20
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear programming & metaheuristic approach for scheduling in the hybrid flowshop with resource constraints
Autorzy:
Figielska, E.
Powiązania:
https://bibliotekanauki.pl/articles/206283.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
flowshop
parallel machines
resource constraints
heuristics
linear programming
genetic algorithms
simulated annealing
tabu search
Opis:
This paper deals with the problem of preemptive scheduling in a two-stage flowshop with parallel unrelated machines and additional renewable resources. The objective is the minimization of makespan. The problem is NP-hard. Heuristic algorithms are proposed which join the linear programming based procedures with metaheuristic algorithms: genetic, simulated annealing and tabu search algorithm. The performance of the proposed algorithms is experimentally evaluated by comparing the solutions with a lower bound on the optimal makespan. Results of a computational experiment show that these algorithms are able to produce good solutions in short computation time and that the metaheuristics significantly improve the results for the most difficult problems.
Źródło:
Control and Cybernetics; 2011, 40, 4; 1209-1230
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ temperatury wyżarzania na strukturę i odporność korozyjną stali duplex X2CrNiMoN22-5-3
The effect of annealing temperature on the structure and corrosion resistance of X2CrNiMoN22-5-3 duplex steel
Autorzy:
Bielanik, J.
Rakowski, C.
Ziółkowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/258420.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
stal duplex
wyżarzanie
struktura
twardość
odporność korozyjna
duplex steel
annealing
structure
hardness
corrosion resistance
Opis:
Dwufazowe stale duplex przesycone z właściwej temperatury charakteryzują się strukturą zawierającą ok. 50% ferrytu i ok. 50% austenitu, wysokimi właściwościami mechanicznymi oraz bardzo dobrą odpornością na korozję ogólną, międzykrystaliczną i wżerową. Wygrzewanie przesyconej stali duplex lub powolne jej chłodzenie w zakresie temperatur 600-900°C zmniejsza udział ferrytu w strukturze, który ulega rozpadowi na międzymetaliczną fazę σ i austenit. Pojawienie się fazy σ w ferrycie wywołuje kruchość stali oraz zmniejsza jej odporność na korozję wżerową obniżając krytyczną temperaturę korozji wżerowej CPT z 60 do 30°C. Wygrzewanie lub powolne chłodzenie przesyconej stali duplex w zakresie temperatur 300-500°C wywołuje tzw. kruchość 475, której nie towarzyszy obniżenie odporności stali na korozję wżerową.
The two-phase ferritic-austenitic duplex steels in an as-quenched condition at the proper temperature is characterised by a two-phase structure including approx. 50% ferrite and approx. 50% austenite, high mechanical proprieties and very good resistance against general and pitting corrosion. A deficiency in duplex steels is their tendency to become brittle in the course of annealing or service in the 300-500°C and 600-900°C temperature ranges. The heating or slow cooling of duplex steels in the range of temperatures 600-900°C reduce, and in extreme cases, even eliminates all contents of the ferrite in the structure, which decomposes in the intermetallic σ phase and austenite. In the σ phase in the ferrite there is a decrease of impact strength KU2 < 10 J of steel and reduction in its resistance to pitting corrosion as the result of epitaxy. After 5 hours of annealing of the X2CrNiMoN22-5-3 duplex steel at a temperature of 750°C, the total contents of the ferrite transformed and had a lower critical pitting temperature (CPT) from 60 to 30°C. The ageing of the X2CrNiMoN22-5-3 steel at the temperature of 450°C for 5 hours is called brittle 475 (KU2 ~ 30 J), which does not accompany the lowering of the resistance to pitting corrosion.
Źródło:
Problemy Eksploatacji; 2010, 2; 85-92
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Localization in Wireless Sensor Networks Using Heuristic Optimization Techniques
Autorzy:
Niewiadomska-Szynkiewicz, E.
Marks, M.
Kamola, M.
Powiązania:
https://bibliotekanauki.pl/articles/308429.pdf
Data publikacji:
2011
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
evolutionary strategy
genetic algorithm
localization
location systems
nonconvex optimization
simulated annealing
wireless sensor network
Opis:
Many applications of wireless sensor networks (WSN) require information about the geographic location of each sensor node. Devices that form WSN are expected to be remotely deployed in large numbers in a sensing field, and to self-organize to perform sensing and acting task. The goal of localization is to assign geographic coordinates to each device with unknown position in the deployment area. Recently, the popular strategy is to apply optimization algorithms to solve the localization problem. In this paper, we address issues associated with the application of heuristic techniques to accurate localization of nodes in a WSN system. We survey and discuss the location systems based on simulated annealing, genetic algorithms and evolutionary strategies. Finally, we describe and evaluate our methods that combine trilateration and heuristic optimization.
Źródło:
Journal of Telecommunications and Information Technology; 2011, 4; 55-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Heating Rate on Accelerated Carbide Spheroidisation (ASR) in 100CrMnSi6-4 Bearing Steel
Wpływ szybkości grzania na przyspieszoną sferoidyzację węglików (ASR) w stali łożyskowej 100CrMnSi6-4
Autorzy:
Hauserova, D.
Dlouhy, J.
Novy, Z.
Powiązania:
https://bibliotekanauki.pl/articles/351803.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carbide spheroidisation
bearing steel
annealing
induction heating
węgliki
ASR
wyżarzanie
stal łożyskowa
grzanie indukcyjne
Opis:
Typical processing routes for bearing steels include a soft annealing stage, the purpose of which is to obtain a microstructure containing globular carbides in ferritic matrix. A newly developed process called ASR cuts the carbide spheroidisation times several fold, producing considerably finer globular carbides than conventional soft annealing. The present paper explores the effect of the heating rate and temperature on the accelerated carbide spheroidisation process and on the resulting hardness. Accelerated spheroidisation was achieved by thermal cycling for several minutes around various temperatures close to the transformation temperature at various heating rates applied by induction heating.
Proces obróbki stali łożyskowych obejmuje wyżarzanie zmiękczajace, którego celem jest uzyskanie mikrostruktury zawierającej kuliste węgliki w osnowie ferrytycznej. Nowo opracowana obróbka zwana ASR polega na wielokrotnym przerywaniu procesu sferoidyzacji, co prowadzi do wytworzenia węglików kulistych o znacznie mniejszych rozmiarach w porównaniu do tych, jakie powstają w konwencjonalnym procesie wyżarzania zmiękczającego. Niniejsza praca analizuje wpływ szybkości grzania i temperatury na proces przyspieszonej sferoidyzacji węglików i na uzyskana twardość. Przyspieszona sferoidyzacje węglików uzyskano dzięki zastosowaniu cyklicznych zmian temperatury trwających kilka minut wokół określonych temperatur bliskich temperaturze przemiany za pomocą grzania indukcyjnego z różnymi prędkościami.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 1199-1203
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Bimetallic Plate Rolling after Explosive Welding
Analiza procesu walcowania blach bimetalowych po połączeniu metodą zgrzewania wybuchowego
Autorzy:
Wypart, J.
Rydz, D.
Stradomski, G.
Dyja, H.
Powiązania:
https://bibliotekanauki.pl/articles/353498.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
explosive welding
copper-aluminum clad
rolling
annealing
zgrzewanie wybuchowe
platerowanie miedziano-aluminiowe
walcowanie
wyżarzanie
Opis:
This work presents the effect of plastic deformation and heat treatment on the properties of joint area of AL99,8 + M1E bimetallic plate. The joining zones were analyzed after rolling in three variants: directly after joining, after joining and annealing at 300°C, and after joining and annealing at 400°C.
Praca przedstawia wpływ przeróbki plastycznej oraz obróbki ciepła na własności złącza blach bimetalowych Al99,8+M1E. Analizie zostanie poddany obszar złącza próbek po walcowanych według trzech wariantów: tj. bezpośrednio po spojeniu, po spojeniu i wyżarzaniu w 300°C oraz po spojeniu i wyżarzaniu w 400°C.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1571-1573
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of Stochastic vs. Greedy Heuristics in Traveling Salesman Problem
Autorzy:
Białogłowski, M.
Staniaszek, M.
Laskowski, W.
Grudniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/91276.pdf
Data publikacji:
2018
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
traveling salesman problem
Nearest Neighbor
Monte Carlo
Simulated Annealing
Genetic Algorithm
particle swarm optimization (PSO)
Opis:
We studied the relative performance of stochastic heuristics in order to establish the relations between the fundamental elements of their mechanisms. The insights on their dynamics, abstracted from the implementation details, may contribute to the development of an efficient framework for design of new probabilistic methods. For that, we applied four general optimization heuristics with varying number of hyperparameters to traveling salesman problem. A problem-specific greedy approach (Nearest Neighbor) served as a reference for the results of: Monte Carlo, Simulated Annealing, Genetic Algorithm, and Particle Swarm Optimization. The more robust heuristics – with higher configuration potential, i.e. with more hyperparameters – outperformed the smart ones, being surpassed only by the method specifically designed for the task.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2018, 12, 19; 7-24
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of structure and mechanical properties of nodular cast irons after casting and after heat treatment
Autorzy:
Vaško, A.
Belan, J.
Kuchariková, L.
Powiązania:
https://bibliotekanauki.pl/articles/114859.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
nodular cast iron
ferritizing annealing
isothermal heat treatment
żeliwo sferoidalne
wyżarzanie ferrytyczne
obróbka cieplna izotermiczna
Opis:
The paper deals with the influence of charge composition on microstructure and mechanical properties of synthetic nodular cast irons after casting and after heat treatment (ferritizing annealing and isothermal heat treatment). Chemical composition of individual melts was regulated alternatively by carburizer and ferrosilicon (FeSi) or metallurgical silicon carbide (SiC). The results of experiments show that SiC additive positively influences the microstructure as well as mechanical properties of nodular cast iron, especially in specimens from the melts with higher ratio of steel scrap in the charge.
Źródło:
Zeszyty Naukowe. Quality. Production. Improvement; 2017, 1 (6); 31-38
2544-2813
Pojawia się w:
Zeszyty Naukowe. Quality. Production. Improvement
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elevated giant magneto-impedance in amorphous metallical co-dased alloys
Autorzy:
Poperenko, L. V.
Manko, D. Y.
Powiązania:
https://bibliotekanauki.pl/articles/384320.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
amorphous metallic alloys
giant magneto-impedance
laser and thermal annealing
cryogenic treatment
three-layer structures
Opis:
This paper reviews results of an enhancement of giant magneto-impedance (GMI) in cobalt-rich amorphous glassy alloys. There are several ways of GMI increasing, namely: thermal, cryogenic and laser treatment. The results are explained via structural changes of ribbons surface and magnetio-optical properties. This phenomenon is interpreted via classical electromagnetic terms. The role of a conductive intermediate film in three-layer sandwich structures is also revealed. Such structure consisting of two cobalt-based ferromagnetic films and a conductive inner film of amorphous nickel shows significant increase of GMI ratio in comparison to a single layer. GMI enhancement makes possible to create new types of high sensitive magnetic field sensors. The investigation of evaluation processes after the ribbons treatment substantiates to clear understanding the nature of GMI.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 12-14
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Poprawa plastyczności stopu AlSi11 przez zastosowanie wyżarzania zmiękczającego
Improvement of plasticity of the AlSi11 alloy due to soft annealing treatment
Autorzy:
Jarco, A.
Powiązania:
https://bibliotekanauki.pl/articles/391461.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
stopy aluminium
wyżarzanie zmiękczające
wydłużenie
wytrzymałość na rozciąganie
aluminum alloys
soft annealing
elongation
tensile strength
Opis:
W artykule przedstawiono badania dotyczące możliwości zwiększenia plastyczności okołoeutektycznego stopu AlSi11 przez zastosowanie wyżarzania zmiękczającego. Dla dwóch przyjętych wielkości wejściowych, tj. temperatury i czasu wygrzewania, w oparciu o trójwartościowy plan przeprowadzono badania pozwalające na przedstawienie zmian wytrzymałości na rozciąganie (Rm) oraz wydłużenia (A5) w zależności od parametrów wyżarzania zmiękczającego (temperatury z przedziału 280°C do 370°C i czasu od 2 godzin do 8 godzin). Dla średnich wartości z przyjętych zakresów temperatury i czasu uzyskano wzrost wydłużenia A5 o około 40% w odniesieniu do wartości wyjściowej. Największy wzrost A5 wyniósł 96%, w porównaniu do stopu wyjściowego, dla wygrzewania w temperaturze 370°C przez 8 godzin, równocześnie nieznacznie spadła wytrzymałość Rm, w granicach 15%.
The paper presents research on the possibility of improving the plasticity of near-eutectic AlSi11 alloy by the use of soft annealing treatment. For two assumed input quantities, i.e. temperature and duration of the soaking treatment, based on the trivalent testing plan, have enabled the presentation of changing tensile strength (Rm) and elongation (A5) in function of the soft annealing parameters (temperature in the range from 280°C to 370°C and time from 2 hours to 8 hours). For average values of assumed range of temperature and time there was an increase in elongation (A5) of about 40% compared to the starting value. The highest increase in elongation (A5) amounted to 96%, compared to the initial alloy, which was obtained in the case of the soaking treatment at temperature 370°C for 8 hours, the tensile strength (Rm) decreased simultaneously within limits of 15%.
Źródło:
Prace Instytutu Odlewnictwa; 2016, 56, 3; 261-266
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and properties of hot-rolled and annealed AZ61 magnesium alloy
Struktura i własności stopu AZ61 po walcowaniu na gorąco i wyżarzaniu
Autorzy:
Sułkowski, B.
Powiązania:
https://bibliotekanauki.pl/articles/263791.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
magnesium alloys
texture
hot rolling
annealing
AZ61
stopy magnezu
tekstura
walcowanie na gorąco
wyżarzanie
Opis:
Magnesium alloy AZ61 was processed by hot rolling up to a large thickness reduction (~89%) in several routes with intermediate annealing. The hot rolling process was conducted at 450°C and at a 1.5 s−1 strain rate. The structure and texture evolution as well as the mechanical properties during processing were investigated. The structure studies showed that, during the hot-rolling process, a large number of twins formed, which had an impact on the mechanical properties of the hot-rolled samples. After annealing for 15 minutes, the twins were no longer observed in the annealed samples, causing a significant decrease in hardness. Moreover, an investigation of the hardness showed that annealing for 15 minutes did not remove all of the hardening effects nor did the hardness of the annealed samples decrease to the value before hot rolling. The texture investigations showed that the texture of the hot-rolled samples was a typical basal-type texture. However, the basal pick was split into two tilted towards the rolling direction (RD). The texture changed during annealing while the new strong texture components evolved. The annealing led to an increased intensity of <1010>{1120} texture component and enhanced ductility. It was concluded that the texture changes observed in the present investigations may lead to the enhanced ductility of magnesium alloys and, therefore, help us design a deformation scheme for magnesium alloys consisting of several thermomechanical routes.
Stop magnezu AZ61 został odkształcony przez walcowanie na gorąco do sumarycznego zgniotu 89%, w kilku przepustach z wyżarzaniem międzyoperacyjnym. Walcowanie odbywało się w temperaturze 450°C, a prędkość odkształcenia wynosiła 1,5 s−1. W pracy badano wpływ struktury oraz tekstury na własności mechaniczne stopu AZ61. Badania strukturalne pokazały występowanie dużej liczby bliźniaków po walcowaniu na gorąco, co miało wpływ na własności mechaniczne. Po wyżarzaniu przez 15 minut struktura nie zawierała bliźniaków oraz zaobserwowano spadek własności mechanicznych badanych próbek, ale nie do wartości sprzed walcowania. Z kolei badania teksturowe wykazały, że po walcowaniu na gorąco powstaje tekstura typu bazalnego, z dwoma pikami odchylonymi od [0001] w kierunku walcowania. Po wyżarzaniu zaobserwowano dodatkowy komponent tekstury, <1010>{1120}, co spowodowało poprawę własności plastycznych badanego materiału. Zaobserwowane zmiany strukturalne i teksturowe wpływają silnie na własności plastyczne stopu AZ61, dzięki czemu możliwe jest odpowiednie zaprojektowanie procesu walcowania tego materiału.
Źródło:
Metallurgy and Foundry Engineering; 2017, 43, 1; 21-29
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie metod FEG SEM i EBSD do badań struktury stali AHSS na różnych etapach procesu ciągłego wyżarzania
Application of FEG-SEM and EBSD methods in examinations of AHSS steel structure at various stages of continuous annealing process
Autorzy:
Radwański, K.
Kuziak, R.
Zalecki, W.
Wrożyna, A.
Molenda, R.
Opara, J.
Powiązania:
https://bibliotekanauki.pl/articles/181928.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:
stal DP
obróbka cieplna
wyżarzanie
FEG SEM
EBSD
DP steel
heat treatment
annealing
FEG-SEM
Opis:
Celem pracy było wykorzystanie metod FEG SEM i EBSD w celu określenia wpływu parametrów procesu ciągłego wyżarzania na zmiany struktury taśm w stanie po walcowaniu na zimno. Obróbkę cieplną wykonano w zakresie temperatur 600÷820°C. W tym celu przeprowadzono również symulacje fizyczne cykli cieplnych ciągłego wyżarzania na próbkach taśm, które poddano następnie badaniom właściwości mechanicznych w statycznej próbie rozciągania. Badania struktury wykonano za pomocą elektronowego mikroskopu skaningowego FEG SEM z szerokim zastosowaniem metody EBSD. Scharakteryzowano możliwości badawcze metody EBSD oraz zastosowano je w badaniach procesów zdrowienia i rekrystalizacji statycznej oraz struktur powstałych po przemianach fazowych w oparciu o analizę parametrów takich jak: Kernel Average Misorientation (KAM), Grain Average Misorientation (GAM), Image Quality (IQ) i kąty dezorientacji. W wyniku przeprowadzonych badań stwierdzono, że w zakresie temperatur 600÷720°C zachodzą procesy zdrowienia i rekrystalizacji statycznej taśm, które ulegają przyspieszeniu ze wzrostem temperatury. Procesy te zachodzą odmiennie w obszarach, w których po walcowaniu na zimno występował ferryt i perlit. W przypadku perlitu procesowi powstawania nowych ziarn towarzyszy dyfuzja węgla i koagulacja cząstek cementytu na granicach ziarn. Począwszy od temperatury 730°C w strukturze obserwuje się martenzyt oraz bainit, których udział powierzchniowy rośnie wraz ze zwiększaniem temperatury wyżarzania. Po przeprowadzonych cyklach obróbki cieplnej taśmy charakteryzują się następującymi właściwościami mechanicznymi: Rp0.2 = 300÷450 MPa, Rm = 630÷720 MPa, A50 = 11÷17%.
The study was aimed at use of FEG SEM and EBSD methods in order to determine the impact of continuous annealing process parameters on changes in strips structure following cold rolling. Heat treatment was conducted in the temperature range 600÷820°C. Moreover, for this purpose, physical simulations were conducted of continuous annealing thermal cycles on samples of strips which, subsequently were subject to static tensile test. Examinations of the structure were conducted by means of scanning electron microscope FEG SEM with broad application of EBSD method. Research capacities of EBSD method were characterized and applied in examinations of recovery and static recrystallization as well as structures formed as a result of phase transitions based on analysis of parameters such as: Kernel Average Misorientation (KAM), Grain Average Misorientation (GAM), Image Quality (IQ) and misorientation angles. As a result of the conducted examinations, it was found that in the temperature range 600÷720°C recovery and static recrystallization of strips occur, which are accelerated along with increase in temperature. These processes differ in the areas with presence of ferrite and pearlite following cold rolling. In case of pearlite, the process of new grain formation is accompanied by carbon diffusion and coagulation of cementite particles on grain boundaries. Starting from the temperature of 730°C, martensite and bainite are observed in the structure, the surface share of which increases along with increase in the temperature of annealing. Following the conducted cycles of heat treatment, the strips are characterized with the following mechanical properties: Rp0.2 = 300÷450 MPa, Rm = 630÷720 MPa, A50 = 11÷17%.
Źródło:
Prace Instytutu Metalurgii Żelaza; 2015, T. 67, nr 2, 2; 136-147
0137-9941
Pojawia się w:
Prace Instytutu Metalurgii Żelaza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simulated annealing based optimization algorithm for automatic variogram model fitting
Symulacja algorytmu optymalizacyjnego procesu odprężania dla automatycznego dopasowania modelu wariogramu
Autorzy:
Soltani-Mohammadi, S.
Safa, M.
Powiązania:
https://bibliotekanauki.pl/articles/219828.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
automatyczne dopasowanie wariogramu
geostatystyka
optymalizacja
symulacje procesu odprężania
automatic variogram fitting
geostatistics
optimization
simulated annealing
Opis:
Fitting a theoretical model to an experimental variogram is an important issue in geostatistical studies because if the variogram model parameters are tainted with uncertainty, the latter will spread in the results of estimations and simulations. Although the most popular fitting method is fitting by eye, in some cases use is made of the automatic fitting method on the basis of putting together the geostatistical principles and optimization techniques to: 1) provide a basic model to improve fitting by eye, 2) fit a model to a large number of experimental variograms in a short time, and 3) incorporate the variogram related uncertainty in the model fitting. Effort has been made in this paper to improve the quality of the fitted model by improving the popular objective function (weighted least squares) in the automatic fitting. Also, since the variogram model function (£) and number of structures (m) too affect the model quality, a program has been provided in the MATLAB software that can present optimum nested variogram models using the simulated annealing method. Finally, to select the most desirable model from among the single/multi-structured fitted models, use has been made of the cross-validation method, and the best model has been introduced to the user as the output. In order to check the capability of the proposed objective function and the procedure, 3 case studies have been presented.
Dopasowanie modelu teoretycznego do eksperymentalnego wariogramu jest kluczowym zagadnieniem w badaniach geostatystycznych ponieważ jeśli parametry modelu wariogramu obarczone są niepewnością, to otrzymamy znaczny rozrzut wyników obliczeń i symulacji. Pomimo, że najpopularniejszą metoda dopasowania jest dopasowanie ‘na oko’, w niektórych przypadkach wykorzystuje się automatyczne metody dopasowania modelu oparte na zasadach geostatystyki i optymalizacji w celu: 1) dostarczenia podstawowego modelu do dopasowania ‘na oko’; 2) dopasowania modelu do większej ilości eksperymentalnych wariogramów w krótkim okresie czasu; 3) uwzględnienia niepewności związanej z wariogramem w dopasowaniu modelu. W pracy podjęto próbę poprawy jakości dopasowania modelu poprzez wprowadzenie zmodyfikowanej popularnej funkcji celu (ważone najmniejsze kwadraty) do au- tomatycznego dopasowania. Ponadto, ponieważ funkcja modelu wariogramu (L) i ilość struktur (m) ma także wpływ na jakość modelu, opracowano program w środowisku MATLAB który podaje optymalne modele wariogramu w oparciu o metodę symulacji odprężania. W części końcowej wybrano najkorzystniejszy model spośród modeli dopasowania z wykorzystaniem metody walidacji krzyżowej i najlepszy model przedstawiany jest użytkownikowi. W celu zbadania możliwości stosowania proponowanej funkcji celu i przedstawionej procedury, zaprezentowano trzy studia przypadku.
Źródło:
Archives of Mining Sciences; 2016, 61, 3; 635-649
0860-7001
Pojawia się w:
Archives of Mining Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse Logistics Network Problem using simulated annealing with and without priority-algorithm
Autorzy:
Benaissa, M.
Slama, I.
Dhiaf, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/223903.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reverse logistics
Logistics Network Problem
mrLNP
priority-based encodin
simulated annealing
logistyka odwrotna
sieci logistyczne
Opis:
In recent years, Reverse Logistics (RL) has become a field of importance for all organizations due to growing environmental concerns, legislation, corporate social responsibility and sustainable competitiveness. In Reverse logistics, the used or returned products are collected after their acquisition and inspected for sorting into the different categories. The next step is to disposition them for repair, remanufacturing, recycling, reuse or final disposal. Manufacturers may adopt reverse logistics by choice or by force, but they have to decide whether performing the activities themselves or outsourcing to a third party (Martin et al., 2010). Lourenço et al., (2003) described three main areas of improvement within the RL process. Firstly, companies can reduce the level of returns through the analysis of their causes. Secondly, they can work on the improvement of the return’s process and, thirdly, they can create value from the returns. This paper considers the multistage reverse Logistics Network Problem (mrLNP) proposed by Lee et al., (2008). With minimizing the total of costs to reverse logistics shipping cost. We will demonstrate the mrLNP model will be formulated as a three-stage logistics network model. Since such network design problems belong to the class of NP-hard problems we propose a Simulated Annealing (SA) and simulated annealing with priority (priSA) with special neighborhood search mechanisms to find the near optimal solution consisting of two stages. Computer simulations show the several numerical examples by using, SA, priSA and priGA(Genetic algorithm with priority-based encoding method) and effectiveness of the proposed method.
Źródło:
Archives of Transport; 2018, 47, 3; 7-17
0866-9546
2300-8830
Pojawia się w:
Archives of Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of thermo-electric coolers using hybrid genetic algorithm and simulated annealing
Autorzy:
Khanh, D. V. K.
Vasant, P.
Elamvazuthi, I.
Dieu, V. N.
Powiązania:
https://bibliotekanauki.pl/articles/230105.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermo-electric coolers
genetic algorithm
simulated annealing
coefficient of performance
rate of refrigeration
fitness function
Opis:
Thermo-electric Coolers (TECs) nowadays are applied in a wide range of thermal energy systems. This is due to their superior features where no refrigerant and dynamic parts are needed. TECs generate no electrical or acoustical noise and are environmentally friendly. Over the past decades, many researches were employed to improve the efficiency of TECs by enhancing the material parameters and design parameters. The material parameters are restricted by currently available materials and module fabricating technologies. Therefore, the main objective of TECs design is to determine a set of design parameters such as leg area, leg length and the number of legs. Two elements that play an important role when considering the suitability of TECs in applications are rated of refrigeration (ROR) and coefficient of performance (COP). In this paper, the review of some previous researches will be conducted to see the diversity of optimization in the design of TECs in enhancing the performance and efficiency. After that, single-objective optimization problems (SOP) will be tested first by using Genetic Algorithm (GA) and Simulated Annealing (SA) to optimize geometry properties so that TECs will operate at near optimal conditions. Equality constraint and inequality constraint were taken into consideration.
Źródło:
Archives of Control Sciences; 2014, 24, 2; 155-176
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Mechanical Properties of Dual-Phase Steel
Mikrostruktura i własności mechaniczne stali dwufazowej
Autorzy:
Miernik, K.
Pytel, S.
Powiązania:
https://bibliotekanauki.pl/articles/354707.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dual-phase steel
DP
intercritical annealing
quenching
mechanical properties
stal dwufazowa
wyżarzanie międzykrytyczne
gaszenie
właściwości mechaniczne
Opis:
The paper presents results of microstructure and mechanical properties of the dual phase (DP) steel plate with 12 mm thickness produced by intercritical annealing at a two-phase region of ferrite and austenite (α + γ) and direct quenching in water. In addition the tempering treatment at temperature of 650°C was applied to investigate effect of martensite softening on mechanical properties of the tested steel. The parameters of heat treatment were designed to achieve the high strength while retaining optimum impact strength of the DP steel.
W pracy przedstawiono wyniki badań własności mechanicznych i mikrostruktury stali dwufazowej (Dual-Phase Steel) w postaci blachy stalowej o grubości 12 mm otrzymanej w wyniku międzykrytycznego wyżarzania w obszarze występowania ferrytu i austenitu (α + γ) z następującym hartowaniem w wodzie. Dodatkowo przeprowadzono obróbkę cieplną uzyskanej stali dwufazowej na drodze odpuszczania w temperaturze 650°C w celu określenia wpływu zastosowanej obróbki na zmianę własności mechanicznych. Parametry obróbek cieplnych były ukierunkowane na osiągnięcie wysokiej wytrzymałości przy jednoczesnym zachowaniu optymalnej udarności badanej stali dwufazowej.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1257-1261
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the High Chromium Cast Iron Microstructure after the Heat Treatment
Autorzy:
Kopyciński, D.
Guzik, E.
Siekaniec, D.
Szczęsny, A.
Powiązania:
https://bibliotekanauki.pl/articles/382103.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high chromium cast iron
heat treatment
hardening
tempering
soft annealing
żeliwo wysokochromowe
obróbka cieplna
hartowanie
wyżarzanie
Opis:
The article presents results of heat treatment on the high chromium cast iron. The study was carrying out on samples cut from the casting made from chromium cast iron. Those were hardened at different temperatures, then tempered and soft annealed. The heat treatment was performed in a laboratory chamber furnace in the Department of Engineering Alloys and Composites at Faculty of Foundry Engineering AGH. At each stage of the heat treatment the hardness was measured by Vickers and Rockwell methods, and the microscope images were done. Additionally based on images from the optical microscope the microstructure was assessed. Based on these results, the effect of hardening, tempering and soft annealing on the microstructure and hardness of high chromium cast iron was studied. Next the effects of different hardening temperatures on the properties of high chromium cast iron were compared. The study led to systemize the literature data of the parameters of heat treatment of high chromium cast iron, and optimal conditions for heat treatment was proposed for casts of similar properties and parameters.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 43-46
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of geometry and annealing temperature in argon atmosphere of TiO2 nanotubes on their electrochemical properties
Autorzy:
Nycz, Marta
Paradowska, Ewa
Arkusz, Katarzyna
Pijanowska, Dorota Genowefa
Powiązania:
https://bibliotekanauki.pl/articles/307103.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dwutlenek tytanu
TiO2
modyfikacja termiczna
wyżarzanie
titanium dioxide (TiO2)
titanium nanotubes
thermal modification
annealing
Opis:
In this paper, electrochemical properties of the as-formed and thermally treated titanium dioxide (TiO2) nanotubes with diameter in the range of 20–100 nm and height in the range of 100–1000 nm were presented. In addition, the effects of annealing temperature (450–550 °C) on the electrochemical characteristics of these structures, as well as the influence of diameter and height of TiO2 nanotubes on these properties were examined. The results were referred to a compact TiO2 layer (100 nm thick). Methods: The electrochemical test included open circuit potential, impedance spectroscopy and cyclic voltammetry measurements. The scanning electron microscope with energy dispersive spectroscopy analyser, x-ray photoelectron spectroscopy, and x-ray diffraction analysers were used for surface morphology characterisation as well as elemental, phase and chemical composition of TiO2 layers. Results: It was found that nanotubes with the diameter of 50 and 75 nm (height of 1000 nm) annealed at 550 °C exhibit the lowest impedance and phase angle values. However, the voltammetric detection of potassium ferricyanide indicated that the closest to 1 Ipc /Ipa ratio were shown by nanotubes with a diameter of 50 and 75 nm annealed at 450 °C. Conclusions: On the basis of performed analysis, it can be stated that the TiO2 layer with nanotubes of 50 nm in diameter and of 1000 nm in height, annealed in 450 °C may be indicated as the ones having the most favourable sensing and biosensing properties.
Źródło:
Acta of Bioengineering and Biomechanics; 2020, 22, 1; 165-177
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Identification of Sound Power Levels and Surface Absorption Coefficients in Multi-Source Industrial Buildings by Using a Simplified Diffusion Model
Autorzy:
Sequeira, M. E.
Cortínez, V. H.
Powiązania:
https://bibliotekanauki.pl/articles/177679.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
industrial noise
noise source identification
sound absorption coefficient
two-dimensional acoustic diffusion model
simulated annealing algorithm
Opis:
This article deals with the identification of sound powers and absorption surface coefficients in multisource industrial buildings from the knowledge of the sound pressure levels (SPLs) at several monitoring points. This inverse problem is formulated as one of optimisation in which the objective function is the difference between the measured and predicted SPLs. The methodology combines the use of a simplified acoustic diffusion model with the simulated annealing optimisation technique. The former is a recently developed model for estimating the SPLs in a fast and sufficiently accurate form. The low computational cost of the model constitutes the major advantage for the optimisation procedure due to the great numer of simulations required. Numerical examples are given to show the efficiency of the proposed approach.
Źródło:
Archives of Acoustics; 2018, 43, 1; 93-102
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Lamellar Graphite Cast Iron Annealing on Hardness and Structure
Autorzy:
Roučka, J.
Prochazka, J.
Kana, V.
Krutis, V.
Nedelova, K.
Powiązania:
https://bibliotekanauki.pl/articles/380964.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast iron
welding
annealing
cast iron hardness
structure stability
żeliwo
spawanie
wyżarzanie
twardość żeliwa
struktura
stabilność
Opis:
An analysis has been carried out of the influence of annealing time at the preheating temperature of 650 °C on the change in hardness and alloy structure of lamellar graphite cast iron in the working as well as in the laboratory conditions. This preheat temperature is common during reclaiming welding of castings with complex shapes. The changes in unalloyed cast iron EN-GJL 200 to EN-GJL 300 according to ISO 1690 standard and cast iron with low amount of elements such as Sn, Cu, Cr, and Mo and their combinations were assessed. It was found that the cast iron of higher strength grades has better hardness and structural stability. Cast iron alloyed with chromium or its combinations has the highest stability. In unalloyed cast iron, a partial degradation of pearlite occurs; in alloyed cast iron the structural changes are not conclusive.
Źródło:
Archives of Foundry Engineering; 2019, 4; 105-112
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Investigation Into The Effect Of Isothermal Annealing On Magnetic Properties In The Alloy: Fe64Co10Y6B20
Wpływ izotermicznego wygrzewania na defekty struktury w stopie Fe64Co10Y6B20
Autorzy:
Nabiałek, M.
Powiązania:
https://bibliotekanauki.pl/articles/354150.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
effect of isothermal annealing
magnetic properties
linear structural defects
izotermiczne wygrzewania
właściwości magnetyczne
liniowe defekty struktury
Opis:
This work presents the results of investigations into the structural and magnetic properties of the bulk amorphous alloy: Fe64Co10Y6B20. The structure, thermal stability and magnetic properties of the alloy were studied using: X-ray diffractometry, differential scanning calorimetry (DSC), and a vibrating sample magnetometer (VSM), respectively. The investigations were performed on samples of the alloy in both the ‘as-cast’ state, and the state resulting from a process of isothermal annealing at a temperature of 750 K for 30 minutes. The aim of the conducted studies was to relax the structure and improve the soft magnetic properties of the investigated alloy. The results show that annealing the alloy at a temperature well below its crystallisation temperature leads to an increase in the value of the saturation magnetisation and a decrease in the value of the coercivity. Utilising the ‘approach to the ferromagnetic saturation’ theorem, the nature of structural defects within the investigated material has been established. For both ‘as-cast’ and isothermally-annealed samples, the magnetisation process has been found to be connected with the existence of linear structural defects.
W pracy przedstawiono wyniki badań struktury oraz właściwości magnetycznych masywnego stopu amorficznego Fe64Co10Y6B20. Strukturę stopu badano wykorzystując dyfrakcję promieni rentgenowskich, stabilność termiczną z wykorzystaniem różnicowej kalorymetrii skaningowej DSC, a właściwości magnetyczne przy użyciu magnetometru wibracyjnego VSM. Badania przeprowadzono dla próbek stopu w stanie po zestaleniu oraz po procesie izotermicznego wygrzewania w temperaturze 750 K w czasie 30 min. Celem prowadzonych badań było zrelaksowanie struktury i poprawa właściwości magnetycznie miękkich badanego stopu. Na podstawie uzyskanych wyników stwierdzono, ze wygrzewanie stopu w temperaturze znacznie niższej od temperatury krystalizacji prowadzi do zwiększenia magnetyzacji nasycenia oraz zmniejszenia wartości pola koercji. Wykorzystując teorię podejścia do ferromagnetycznego nasycenia określono rodzaj defektów struktury badanego materiału. Zarówno dla próbki w stanie po zestaleniu jak i po izotermicznym wygrzewaniu proces magnesowania związany jest z obecnością liniowych defektów struktury.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 1987-1991
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Artificial immune system in planning deliveries in a short time
Autorzy:
Mrówczyńska, B.
Król, A.
Czech, P.
Powiązania:
https://bibliotekanauki.pl/articles/200739.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
artificial immune system
genetic algorithm
simulated annealing
open vehicle routing problem
on-time delivery
Taguchi method
Opis:
In the calculations presented in the article, an artificial immune system (AIS) was used to plan the routes of the fleet of delivery vehicles supplying food products to customers waiting for the delivery within a specified, short time, in such a manner so as to avoid delays and minimize the number of delivery vehicles. This type of task is classified as an open vehicle routing problem with time windows (OVRPWT). It comes down to the task of a traveling salesman, which belongs to NP-hard problems. The use of the AIS to solve this problem proved effective. The paper compares the results of AIS with two other varieties of artificial intelligence: genetic algorithms (GA) and simulated annealing (SA). The presented methods are controlled by sets of parameters, which were adjusted using the Taguchi method. Finally, the results were compared, which allowed for the evaluation of all these methods. The results obtained using AIS proved to be the best.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 5; 969-980
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of repeated heating on corrosion resistance, hardness and microstructure of a Co-Cr-W prosthetic alloy
Autorzy:
Rzepkowska, M.
Burnat, B.
Pietnicki, K.
Skrzypek, S.
Klimek, L.
Powiązania:
https://bibliotekanauki.pl/articles/368058.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
mechanical properties
corrosion
prosthetic alloys
structure
high temperature annealing
właściwości mechaniczne
korozja
stopy protetyczne
struktura
wygrzewanie wysokotemperaturowe
Opis:
Purpose: of this article is to present the results of tests carried out on the impact of repeated heating on the corrosion resistance of a Co-Cr-W prosthetic alloy. Design/methodology/approach: The study used samples prepared in a manner analogous to the production of a dental prosthesis. The effect of three and six-time heating of the material on its properties such as corrosion resistance, microstructure and material hardness were carried out. Findings: Repeated heating of the chromium-cobalt alloy has no significant effect on the polarization resistance and the potentiodynamic characteristics of the material. The introduction of heating in alloy treatment results in an increase in the hardness of the material, however, the number of annealing cycles does not affect this feature significantly. Samples subjected to different amounts of thermal treatments have different microstructure; it should be assumed that this will change the mechanical properties. Research limitations/implications: Microstructure tests carried out after electrochemical corrosion tests showed changes in the microstructure of samples subjected to subsequent annealing. The tests of material hardness and corrosion did not show any significant differences that may result from differences in structure, therefore further tests characterizing the physical properties of the material will be carried out. Originality/value: The article is a description of preliminary research on the impact of multiple annealing used in dental prosthetics on the properties of metallic material. Further work will be carried out to identify the properties that may be affected by the indicated changes in microstructure.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 99, 2; 64-71
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of High Temperature Annealing on Fluorine Distribution Profile and Electro-Physical Properties of Thin Gate Oxide Fluorinated by Silicon Dioxide RIE in CF4 Plasma
Autorzy:
Kalisz, M.
Głuszko, G.
Beck, R. B.
Powiązania:
https://bibliotekanauki.pl/articles/308059.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
capacitance-voltage characteristics
current-voltage characteristics
fluorine plasma
high temperature annealing process
radio frequency reactive ion etching
Opis:
This study describes the effects of high temperature annealing performed on structures fluorinated during initial silicon dioxide reactive ion etching (RIE) process in CF4 plasma prior to the plasma enhanced chemical vapour deposition (PECVD) of the final oxide. The obtained results show that fluorine incorporated at the PECVD oxide/Si interface during RIE is very stable even at high temperatures. Application of fluorination and high temperature annealing during oxide layer fabrication significantly improved the properties of the interface (Ditmb decreased), as well as those of the bulk of the oxide layer (Qeff decreased). The integrity of the oxide (higher Vbd ) and its uniformity (Vbd distribution) are also improved.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 1; 25-28
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptive prediction of stock exchange indices by state space wavelet networks
Autorzy:
Brdyś, M. A.
Borowa, A.
Idźkowiak, P.
Brdyś, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/907656.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
prognozowanie
giełda
sztuczna inteligencja
wyżarzanie symulowane
forecasting
stock exchange
artificial intelligence
state space wavelet network
simulated annealing
Opis:
The paper considers the forecasting of the Warsaw Stock Exchange price index WIG20 by applying a state space wavelet network model of the index price. The approach can be applied to the development of tools for predicting changes of other economic indicators, especially stock exchange indices. The paper presents a general state space wavelet network model and the underlying principles. The model is applied to produce one session ahead and five sessions ahead adaptive predictors of the WIG20 index prices. The predictors are validated based on real data records to produce promising results. The state space wavelet network model may also be used as a forecasting tool for a wide range of economic and non-economic indicators, such as goods and row materials prices, electricity/fuel consumption or currency exchange rates.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 337-348
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization schemes for wireless sensor network localization
Autorzy:
Niewiadomska-Szynkiewicz, E.
Marks, M.
Powiązania:
https://bibliotekanauki.pl/articles/907665.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
sieć bezprzewodowa
sieć sensorowa
lokalizacja
optymalizacja stochastyczna
wyżarzanie symulowane
wireless sensor networks
localization
stochastic optimization
simulated annealing
Opis:
Many applications of wireless sensor networks (WSN) require information about the geographical location of each sensor node. Self-organization and localization capabilities are one of the most important requirements in sensor networks. This paper provides an overview of centralized distance-based algorithms for estimating the positions of nodes in a sensor network. We discuss and compare three approaches: semidefinite programming, simulated annealing and two-phase stochastic optimization-a hybrid scheme that we have proposed. We analyze the properties of all listed methods and report the results of numerical tests. Particular attention is paid to our technique-the two-phase method-that uses a combination of trilateration, and stochastic optimization for performing sensor localization. We describe its performance in the case of centralized and distributed implementations.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2009, 19, 2; 291-302
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Formation, Properties and Use of Dispersed Iron-Graphite Metallurgical Waste
Autorzy:
Dan, Leonid
Maslov, Vladimir
Trofimova, Larysa
Cios, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/2172384.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
dispersed iron-graphite waste
graphite
iron oxides
specific saturation magnetization
magnetizing annealing
carbothermal self-reduction
magnetic graphite
Opis:
Dispersed wastes containing graphite, iron, and its oxides, getting into the air and accumulating in landfills, cause serious harm to human health and the environment. Moreover, even if the issue of the localization of these wastes has been solved successfully, their disposal has not yet been fully organized. In the present study, a systematic analysis of the dispersed iron-graphite waste (IGW) conditions for the formation at metallurgical enterprises, their structure, and their properties were carried out. In this case, special attention is focused on the electrophysical properties: specific saturation magnetization and volume resistivity. The presence of magnetic properties in IGW, combined with low electrical resistivity, makes IGW a promising and inexpensive raw material for obtaining cheap composite materials with radio shielding and radio absorbing properties in the microwave range. As a result of the research, effective ways of improving the magnetic properties of IGW by high-temperature treatment were obtained. The practical result of the research was the development and implementation of a technological scheme of dispersed IGW complex processing, which makes it possible to solve a twofold task – to exclude the ingress of iron-graphite wastes into the environment and to obtain a cheap material for protection against microwave radiation.
Źródło:
Journal of Casting & Materials Engineering; 2022, 6, 4; 81--92
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Soft Annealing Treatment on Impact Strength and Hardness of the EN AC-AlSi11 Alloy
Autorzy:
Jarko, A.
Powiązania:
https://bibliotekanauki.pl/articles/380988.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat treatment
aluminium alloys
alpax alloy
silumins
soft annealing
obróbka cieplna
stopy aluminium
stop alpax
siluminy
wygrzewanie
Opis:
The paper presents research on the effects of soft annealing parameters on a change of the impact strength KC and Brinell hardness (HB) of the EN AC-AlSi11 alloy. The research has been performed according to the trivalent testing plan for two input parameters – temperature in the range between 280°C and 370°C and time in the range between 2 and 8 hours. The application of such heat treatment improves the plasticity of the investigated alloy. The improvement of the impact strength KC by 71% and the decrease of the hardness HB by 20% was achieved for the soft annealing treatment conducted at a temperature 370°C for 8 hours, compared to the alloy without the heat treatment. A change of the form of eutectic silicon precipitations which underwent refinement, coagulation and partial rounding, had a direct effect on the hardness HB and impact strength KC. The results obtained were used to prepare space plots enabling the temperature and time for soft annealing treatment to be selected with reference to the obtained impact strength KC and hardness HB of the alloy with the heat treatment.
Źródło:
Archives of Foundry Engineering; 2017, 17, 3; 55-58
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical models of catalytic domains of protein phosphatases 1 and 2A with Zn2+ and Mn2+ metal dications and putative bioligands in their catalytic centers.
Autorzy:
Woźniak-Celmer, Edyta
Ołdziej, Stanisław
Ciarkowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1044161.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
protein phosphatase inhibitors
constrained simulated annealing
protein phosphatase 1A and 2B
molecular dynamics
homology modeling
Opis:
The oligomeric metalloenzymes protein phosphatases dephosphorylate OH groups of Ser/Thr or Tyr residues of proteins whose actions depend on the phosphorus signal. The catalytic units of Ser/Thr protein phosphatases 1, 2A and 2B (PP1c, PP2Ac and PP2Bc, respectively), which exhibit about 45% sequence similarity, have their active centers practically identical. This feature strongly suggests that the unknown structure of PP2Ac could be successfully homology-modeled from the known structures of PP1c and/or PP2Bc. Initially, a theoretical model of PP1c was built, including a phosphate and a metal dication in its catalytic site. The latter was modeled, together with a structural hydroxyl anion, as a triangular pseudo-molecule (Zno or Mno), composed of two metal cations (double Zn2+ or Mn2+, respectively) and the OH- group. To the free PP1c two inhibitor sequences R29RRRPpTPAMLFR40 of DARPP-32 and R30RRRPpTPATLVLT42 of Inhibitor-1, and two putative substrate sequences LRRApSVA and QRRQRKpRRTI were subsequently docked. In the next step, a free PP2Ac model was built via homology re-modeling of the PP1c template and the same four sequences were docked to it. Thus, together, 20 starting model complexes were built, allowing for combination of the Zno and Mno pseudo-molecules, free enzymes and the peptide ligands docked in the catalytic sites of PP1c and PP2Ac. All models were subsequently subjected to 250-300 ps molecular dynamics using the AMBER 5.0 program. The equilibrated trajectories of the final 50 ps were taken for further analyses. The theoretical models of PP1c complexes, irrespective of the dication type, exhibited increased mobilities in the following residue ranges: 195-200, 273-278, 287-209 for the inhibitor sequences and 21-25, 194-200, 222-227, 261, 299-302 for the substrate sequences. Paradoxically, the analogous PP2Ac models appeared much more stable in similar simulations, since only their "prosegment" residues 6-10 and 14-18 exhibited an increased mobility in the inhibitor complexes while no areas of increased mobility were found in the substrate complexes. Another general observation was that the complexes with Mn dications were more stable than those with Zn dications for both PP1c and PP2Ac units.
Źródło:
Acta Biochimica Polonica; 2001, 48, 1; 35-52
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Neuro-fuzzy modelling based on a deterministic annealing approach
Autorzy:
Czabański, R.
Powiązania:
https://bibliotekanauki.pl/articles/908442.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system rozmyty
sieć neuronowa
ekstrakcja reguł
fuzzy systems
neural networks
neuro-fuzzy systems
rules extraction
deterministic annealing
prediction
Opis:
This paper introduces a new learning algorithm for artificial neural networks, based on a fuzzy inference system ANBLIR. It is a computationally effective neuro-fuzzy system with parametrized fuzzy sets in the consequent parts of fuzzy if-then rules, which uses a conjunctive as well as a logical interpretation of those rules. In the original approach, the estimation of unknown system parameters was made by means of a combination of both gradient and least-squares methods. The novelty of the learning algorithm consists in the application of a deterministic annealing optimization method. It leads to an improvement in the neuro-fuzzy modelling performance. To show the validity of the introduced method, two examples of application concerning chaotic time series prediction and system identification problems are provided.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2005, 15, 4; 561-576
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulowane wyżarzanie dla problemu harmonogramowania projektu z ograniczonymi zasobami
Simulated annealing for project scheduling with limited resources
Autorzy:
Klimek, M.
Powiązania:
https://bibliotekanauki.pl/articles/91479.pdf
Data publikacji:
2016
Wydawca:
Warszawska Wyższa Szkoła Informatyki
Tematy:
wyżarzanie symulowane
harmonogramowanie projektu
ograniczone zasoby
procedury generowania rozwiązań
simulated annealing
resource-constrained project scheduling
schedule generation schemes
Opis:
W artykule przedstawiony jest problem harmonogramowania projektu z ograniczonymi zasobami z kryterium minimalizacji czasu trwania przedsięwzięcia. Do rozwiązania zagadnienia stosowany jest algorytm symulowanego wyżarzania, którego skuteczność testowana jest przy wykorzystaniu standardowych zadań testowych. Eksperymenty przeprowadzane są przy różnych konfiguracjach algorytmu w celu ustalenia najlepszych parametrów: schematu chłodzenia, technik przeszukiwania (ruchów), schematów generowania rozwiązań.
In this paper resource-constrained project scheduling problem with optimisation criterion of minimising makespan is presented. To solve the problem is applied simulated annealing algorithm, whose effectiveness is tested using standard test instances. Experiments are performed with different configurations algorithm to determine the best parameters: cooling schemes, search techniques (moves), schedule generation schemes.
Źródło:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki; 2016, 10, 15; 53-65
1896-396X
2082-8349
Pojawia się w:
Zeszyty Naukowe Warszawskiej Wyższej Szkoły Informatyki
Dostawca treści:
Biblioteka Nauki
Artykuł

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