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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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
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:
Long-term Annealing of NiCrAlY LENS Coating on 316L Steel
Autorzy:
Szymański, Krzysztof K.
Powiązania:
https://bibliotekanauki.pl/articles/2203942.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
NiCrAlY
LENS
Laser Engineered Net Shaping
additive manufacturing
long-term annealing
microstructural stability
produkcja dodatkowa
długotrwałe wyżarzanie
stabilność mikrostrukturalna
Opis:
This article presents the results of a research on the behavior of NiCrAlY coating obtained by the LENS method on austenitic stainless steel type 316L under long-term annealing conditions at 1000°C for 25, 100 and 250 hours. The morphology of the NiCrAlY layer as a function of annealing time and temperature was characterized. The chemical composition and distribution of alloying elements were evaluated using scanning microscopy and micro-area chemical composition analysis. It was revealed that NiCrAlY coatings deposited by LENS method are characterized by good metallurgical quality. The long-term annealing of the NiCrAlY coating led to microstructural changes in the form of the disappearance of the original dendritic structure and the formation of a solid solution of nickel with chromium and a small amount of aluminum, as well as chromium α-Cr precipitates and Ni-Y-type phases. The effect of increasing iron concentration in the coating due to diffusion-to-core processes was also found.
Źródło:
Archives of Foundry Engineering; 2022, 22, 4; 116--120
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
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:
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:
Extraction of fuzzy rules using deterministic annealing integrated with ε-insensitive learning
Autorzy:
Czabański, R.
Powiązania:
https://bibliotekanauki.pl/articles/908395.pdf
Data publikacji:
2006
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
system rozmyty
sieć neuronowa
sieć neuronowa rozmyta
ekstrakcja reguł
fuzzy systems
neural networks
neuro-fuzzy systems
rules extraction
deterministic annealing
Opis:
A new method of parameter estimation for an artificial neural network inference system based on a logical interpretation of fuzzy if-then rules (ANBLIR) is presented. The novelty of the learning algorithm consists in the application of a deterministic annealing method integrated with ε-insensitive learning. In order to decrease the computational burden of the learning procedure, a deterministic annealing method with a “freezing” phase and ε-insensitive learning by solving a system of linear inequalities are applied. This method yields an improved neuro-fuzzy modeling quality in the sense of an increase in the generalization ability and robustness to outliers. To show the advantages of the proposed algorithm, two examples of its application concerning benchmark problems of identification and prediction are considered.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2006, 16, 3; 357-372
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
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:
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:
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:
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:
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:
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
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:
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:
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:
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:
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:
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:
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:
Cotton Fibre-to-Yarn Engineering: A Simulated Annealing Approach
Przetwarzanie włókien bawełnianych na przędze – problem optymalizacji
Autorzy:
Das, S.
Ghosh, A.
Powiązania:
https://bibliotekanauki.pl/articles/233554.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
cotton fibre properties
Frydrych model
simulated annealing
yarn strength
yarn engineering
właściwości włókien bawełnianych
model Frydrych
metoda symulacji SA
wytrzymałość przędzy
inżynieria przędzy
Opis:
In this paper we undertake to engineer yarn of predefined strength by choosing suitable raw material and process parameters. In an attempt to achieve a yarn of optimal strength, the constrained optimisation problem is formulated with the relation between raw material and yarn properties. Frydrych’s theoretical model of yarn strength is used for formulation of the optimisation problem. The simulated annealing (SA) method has been used to solve the optimisation problem by researching the best combination of raw material and process parameters that can bring into reality a yarn with the strength desired. The results show that SA is capable of ascertaining a set of parameters that gives the yarn strength desired.
W pracy podjęto próbę otrzymywania przędzy o określonej wytrzymałości poprzez wybór odpowiedniego surowca i parametrów procesu przędzenia. W celu otrzymania przędzy o optymalnej wytrzymałości sformułowano problem optymalizacji zawierający zależności pomiędzy surowcem i właściwościami przędzy. Zastosowano przy tym teoretyczny model Frydrych wytrzymałości przędzy a także metodę symulacji SA. Udokumentowano, że za pomocą zastosowanej metody symulacji można sprecyzować zestaw parametrów, który umożliwia osiągniecie zakładanej wytrzymałości przędzy.
Źródło:
Fibres & Textiles in Eastern Europe; 2015, 3 (111); 51-53
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
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:
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:
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:
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:
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:
Wpływ modyfikacji hydrotermicznej typu annealing na wybrane właściwości skrobi grochu (Pisum sativum)
Effect of hydrothermal modification of annealing type on some selected properties of starch pea (Pisum sativum)
Autorzy:
Piecyk, M.
Konarzewska, M.
Sitkiewicz, I.
Powiązania:
https://bibliotekanauki.pl/articles/826128.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Technologów Żywności
Tematy:
Pisum sativum
groch
modyfikacja hydrotermiczna
nasiona
skrobia
rozpuszczalnosc
wodochlonnosc
strawnosc
Opis:
W pracy otrzymano preparaty ze zmielonych i obłuszczonych nasion grochu (Pisum sativum) odmiany Poa i Ramir, kóre poddawano modyfikacji hydrotermicznej (stosunek skrobia : woda 1:2) w temperaturze 60 °C przez 24 h. Uzyskane preparaty charakteryzowały się wysoką zawartością skrobi tj. ponad 92 % w s.m. Zawartość amylozy w skrobi była na zbliżonym poziomie w obu odmianach i wnosiła odpowiednio 26,5 % w grochu odmiany Poa i 24 % w odmianie Ramir. Wodochłonność w temp. 60 °C była na tym samym poziomie w obu odmianach, natomiast rozpuszczalność była wyższa w grochu odmiany Poa niż w odmianie Ramir i wynosiła odpowiednio 10,3 i 7,1 %. Podniesienie temperatury do 80 °C wpłynęło na zwiększenie zarówno rozpuszczalności, jak i wodochłonności. Badane skrobie charakteryzowały się dość niską strawnością wynoszącą 44,6 % i 36,8 %, odpowiednio w przypadku odmiany Poa i odmiany Ramir. Zastosowanie modyfikacji hydrotermicznej typu annealing spowodowało dodatkowe oczyszczenie skrobi przez zmniejszenie zawartości białka i związków mineralnych oznaczonych w postaci popiołu. Stwierdzono również zmniejszenie udziału frakcji amylozy oraz zawartości fosforu, co prawdopodobnie wpłynęło na powstanie nowych obszarów krystalicznych w wyniku silniejszego związania się łańcuchów amylopektyny, a w efekcie przyczyniło się do obniżenia powierzchni właściwej ziarenek skrobi, ich wodochłonności oraz rozpuszczalności zarówno w temp. 60 °C, jak i 80 °C. Stwierdzono również znaczną poprawę strawności in vitro skrobi (~2-krotną) w obu preparatach.
In this research study, preparations made of ground and shelled pea seeds (Pisum sativum) of Poa and Ramir variety were hydrothermally modified (the starch : water ratio was 1 : 2) at a temperature of 60 °C, for 24 h. The preparations obtained were characterized by a high content of starch (i.e. more than 92 % in dry mass). The content of amylose in the starch was similar for the two varieties and amounted to 26.5 % (Poa) and 24 % (Ramir). The water holding capacity of starch of the two varieties was at the same level at a temperature of 60°C, whereas the solubility of Poa pea was higher than of Ramir pea and amounted to 10.3 % and 7.1 %, respectively. The increase in temperature to 80 °C caused the increase in both the solubility and water holding capacity. The starches studied were characterized by a rather low digestibility of 44.6 % as for Poa and of 36.8 % as for Ramir. The effect of hydrothermal modification of the annealing type applied was that the pea starch was additionally purified through decreasing the content of proteins and mineral compounds determined as ash. Additionally, it was found that the amylase fraction and the content of phosphorus decreased. This probably impacted the formation of new crystalline areas as a result of stronger bonds between amylopectin chains, and, finally, was a factor causing the real surface of starch grains, their water holding capacity and solubility to decrease at a temperature of 60 °C and of 80 °C. A considerable improvement was also found in the in vitro digestibility (> 2-fold) of the two preparations.
Źródło:
Żywność Nauka Technologia Jakość; 2009, 16, 5
1425-6959
Pojawia się w:
Żywność Nauka Technologia Jakość
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:
The effect of annealing and anisotropic behaviour on tensile and fatigue properties of AA 8090
Autorzy:
Abass, M. H.
Mahmud, F.
Alali, M. S.
Abood, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/378497.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
AA 8090
anisotropic behavior
annealing
tensile strength
fatigue strength
AA8090
zachowanie anizotropowe
wyżarzanie
wytrzymałość na rozciąganie
wytrzymałość zmęczeniowa
Opis:
Purpose: This paper aims to assess microstructures and mechanical properties of annealed and un-annealed Al-Li alloys (AA8090) and provide valid information regarding influence of anisotropy on tensile properties, fatigue lives. Design/methodology/approach: The methodology included investigating the influence of annealing on grain size, tensile strength and fatigue lives of AA8090. Optical microscope, scanning electron microscope and X-ray diffraction were utilized to analyse the crystallographic texture. Findings: The results showed that the un-annealed alloy exhibited much finer grain structure in three directions, namely longitudinal (L) rolling direction, L-45° and Long transverse (LT) combined with stronger crystallographic texture. Regarding to mechanical properties, un-annealed alloy presented superior tensile strength with strong anisotropic behaviour. L and LT grains direction showed highest tensile strength value of 550 MPa and L-45° showed lowest tensile strength value of 420 MPa. Results of fatigue test revealed that annealed Al-Li alloy has lower fatigue lives with high influence of test direction on fatigue properties. Higher variation in fatigue life to failure links with un-annealed alloy over annealed alloy. Examination of fractured surface showed that the morphology of fractured surface is a mixture of ductile and brittle fractures in both annealed and un-annealed alloys with more brittle behaviour in un-annealed alloy. Research limitations/implications: The main challenge of this work is the determination of the test direction (test angle in respect to rolling direction), which is necessary to provide correct information regarding mechanical properties. Further study of low cycle fatigue can be done in future, which will be an excellent indication to mechanical properties of this alloy since it provides more understanding to the behaviour of the material and better comprehend crack propagation and strain stress concentration. Practical implications: AA8090 alloy is an important candidate for aerospace and aircraft industries. Influence of annealing heat treatment and rolling direction on mechanical properties of AA8090 alloy provides more accurate information to the manufacturers who deal with this alloy. Originality/value: This study is affording a significant information regarding the effect of annealing and anisotropic behaviour on mechanical properties of AA8090. To our knowledge, there are few reports that study this combination of factors on AA8090 alloy.
Źródło:
Archives of Materials Science and Engineering; 2019, 99, 1/2; 5-12
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soft-Sensing in Batch Annealing Based on Finite Differential Method and Support Vector Regression
Autorzy:
Kačur, Ján
Durdán, Milan
Laciak, Marek
Flegner, Patrik
Powiązania:
https://bibliotekanauki.pl/articles/103270.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
annealing
steel coil
temperature measurement
soft-sensing
finite differences method
support vector regression
wyżarzanie
cewka stalowa
pomiar temperatury
wyczuwanie
metoda różnic skończonych
regresja wektora nośnego
Opis:
The temperature of annealed steel coils is a determining variable of the future steel sheets quality. This variable also determines the energy consumption in operation. Unfortunately, the monitoring of coil inner temperature is problematic due to the furnace environment with high temperature, coil structure, and annealing principle. Currently, there are no measuring principles that can measure the temperature inside the heat-treated product in a non-destructive manner. In this paper, the soft sensing of inner temperature based on the theory of non-stationary heat conduction and approach based on Support Vector Regression (SVR) was presented. The results showed that a black-box approach based on the SVR could replace an analytic approach, though with lesser performance. Several annealing experiments were performed to create a training data set and model performance improvement in the estimation of inner coil temperatures. The proposed software based on non-stationary heat conduction can calculate the behavior of inner coil temperature from the measured boundary temperatures that are measured by thermocouples. The soft-sensing principles presented in this paper were verified under laboratory conditions and on the data obtained from a real annealing plant.
Źródło:
Advances in Science and Technology. Research Journal; 2019, 13, 4; 70-86
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
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:
Effect of the Annealing Temperature on the Microstructure and Properties of Ausferritic Nodular Cast Iron
Autorzy:
Gumienny, G.
Klimek, L.
Kurowska, B.
Powiązania:
https://bibliotekanauki.pl/articles/383050.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting materials
innovative casting technologies
ausferritic cast iron
nodular cast iron
impact strength
annealing
innowacyjne materiały odlewnicze
innowacyjne technologie odlewnicze
żeliwo ausferrytyczne
żeliwo sferoidalne
siła uderzenia
wyżarzanie
Opis:
The paper presents the microstructure and selected properties of ausferritic nodular cast iron annealed at the temperature 520 and 550°C. This choice was dictated by the temperatures used in the practice of nitriding. Nodular graphite in cast iron was obtained with use of Inmold process. Cast iron containing molybdenum and copper ensuring obtaining an ausferrite in the cast iron matrix without the use of heat treatment of castings was tested. The effect of annealing temperature on the microstructure and the kind of fracture of the ausferritic nodular cast iron was presented. The effect of an annealing temperature on hardness, impact strength and the microhardness of ausferritic nodular cast iron matrix was shown too. The lamellar structure of phases in the cast iron matrix after annealing has been ascertained. There has been an increase in hardness of an annealed cast iron and microhardness of its matrix. The reduction in the impact strength of the cast iron annealed at 520 and 550°C was approximately 10-30%. Both an increase in the hardness of cast iron as well as an decrease in its impact strength is probably due to the separation of secondary carbides during the heat treatment.
Źródło:
Archives of Foundry Engineering; 2016, 16, 3; 43-48
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
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

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