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Tytuł:
Analysis of non-equidistant baffle spacing in a small shell and tube heat exchanger
Autorzy:
Aziz, Abdullah
Rehman, Shafique
Powiązania:
https://bibliotekanauki.pl/articles/240423.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermal distribution
baffle spacing
heat exchanger
turbulence modeling
CFD study
Opis:
Most of the formulations regarding the characteristics of a shell and tube heat exchanger have a common assumption; namely that the baffle plates are equidistant. This assumption fails to cater the real world scenario for defective baffles as the alteration in a shell and tube heat exchanger invalidates the equidistant baffle spacing of the plates. In this regard, a small six baffles heat exchanger was modeled in the computational fluid dynamics software package and studied by removing each baffle plate one at a time. Effect of removing each baffle plate on the temperature, pressure, heat transfer coefficient, and total heat transfer rate was recorded. It was observed that variation in the pressure drop for the same number of baffle plates varies along the axial order of the plates. The change in pressure drop due to the removal of the baffle plate near the inlet and the outlet was lowest and reaches a maximum in the axial center. It was also found that the plates below the radial center contribute higher towards the overall heat transfer as compared to those above.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 201-221
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of semi-automated calibration system for pressure balances
Autorzy:
Türk, Ahmet
Hamarat, Abdullah
Durgut, Yasin
Powiązania:
https://bibliotekanauki.pl/articles/2173904.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
semi-automated calibration
pressure balance
digital manometer assisted method
Opis:
In this study, a digital manometer was used as a transfer standard to perform calibration of a pneumatic pressure balance. The same pressure balance was calibrated with the cross-floating method based on falling rate determination (FRD). Average of differences among the effective area results show an agreement of less than 10 ppm between the digital manometer-assisted calibration (DMAC) method and the FRD method. The method in which a digital pressure gauge is used as a transfer standard not only facilitates calibration but also enables the automation of pressure balance calibration. Full automation of pressure balance calibration requires an automatic mass loading system for both the reference instrument and the device under test. Since there is a lot of different kinds of pressure balances, it is nearly impossible for a pressure metrology laboratory to have an automatic mass-handler system for every type of pressure balance. Therefore, a more efficient way in which automated mass-handler systems are not required .., a semi-automatic calibration system, is designed. For that purpose, two different calibration procedures, increasing-decreasing cycles, and pressurize-vent (P-V) procedures are performed and compared. The equivalence of procedure results makes the semi-automated calibration design of pressure balances possible. The most distinguishing advantages of a semi-automated calibration system are the applicability to any type of pressure balance and low cost compared to full automation.
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 623--638
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular investigation and phylogeny of Theileria spp. from naturally infected sheep and the first report of Theileria sp. OT3 in Sulaymaniyah governorate/Iraq
Autorzy:
Abdullah, S.H.
Ali, S.A.
Powiązania:
https://bibliotekanauki.pl/articles/2087179.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Theileria ovis
T. lestoquardi
T. uilenbergi
PCR
sheep parasites
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 2; 201-209
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Does Self-esteem Mediate the Relationship between Gratitude and Subjective Well-being?
Autorzy:
Yildirim, Murat
Alshehri, Nouf Abdullah
Aziz, Izaddin Ahmad
Powiązania:
https://bibliotekanauki.pl/articles/2129720.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
subjective well-being
gratitude
self-esteem
satisfaction with life
positive experience
negative experience
Opis:
There is a growing body of research investigating the relationships among gratitude, self-esteem, and subjective well-being. However, there remains a scarcity of research examining the impact of self-esteem on the relationship between gratitude and subjective well-being within Arabic context. In this study, 300 Arabic speaking adults completed measurements of gratitude, self-esteem, satisfaction with life, and positive and negative experiences. Participants’ ages ranged between 18 and 54 years with a mean age of 29.67 years (SD = 8.91). The correlation results revealed that there were significant positive relationships between gratitude, self-esteem, satisfaction with life, and positive experience, while there were significant negative relationships between gratitude, self-esteem, satisfaction with life, and negative experience. The results also showed that gratitude and self-esteem directly predicted subjective well-being. Additionally, using structural equation modeling, self-esteem exerted a mediation effect on the relationship between gratitude and subjective well-being. The results suggest that enhancing self-esteem could assist adults who have gratitude to experience greater subjective well-being. Using the source of self-esteem, researchers and professionals could improve one’s subjective well-being by employing various gratitude activities.
Źródło:
Polish Psychological Bulletin; 2019, 50, 2; 149-156
0079-2993
Pojawia się w:
Polish Psychological Bulletin
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phylogenetic and secondary RNA structure analysis of monogenean gill ectoparasites (Dactylogyrus spp.) parasitizing certain freshwater fishes
Autorzy:
Koyee, Q.M.K.
Abdullah, S.M.A.
Powiązania:
https://bibliotekanauki.pl/articles/2087415.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
evolutionary tree
secondary RNA structure
Dactylogyrus spp.
cyprinids
Iraq
Źródło:
Polish Journal of Veterinary Sciences; 2019, 4; 667-675
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Swing-up control of mass body interlinked flexible tether
Sterowanie wychyleniem masywnego ciała na elastycznej uwięzi
Autorzy:
Abdullah, M. A.
Michitsuji, Y.
Takehara, S.
Nagai, M.
Miyajima, N.
Powiązania:
https://bibliotekanauki.pl/articles/139466.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sterowanie wychyleniem
dynamika układu wieloczłonowego
ciało elastyczne
algorytm genetyczny
uwięź
bezwzględne współrzędne węzłowe
motion control
multibody dynamics
flexible body
genetic algorithm
tether
Absolute Nodal Coordinate Formulation
Opis:
One of the applications of tether system is in the field of satellite technology, where the mother ship and satellite equipment are connected with a cable. In order to grasp the motion of this kind of tether system in detail, the tether can be effectively modeled as flexible body and dealt by multibody dynamic analysis. In the analysis and modeling of flexible body of tether, large deformation and large displacement must be considered. Multibody dynamic analysis such as Absolute Nodal Coordinate Formulation with an introduction of the effect of damping force formulation can be used to describe the motion behavior of a flexible body. In this study, a parameter identification technique via an experimental approach is proposed in order to verify the modeling method. An example of swing-up control using the genetic algorithm control approach is performed through simulation and experiment. The validity of the model and availability of motion control based on multibody dynamics analysis are shown by comparison between numerical simulation and experiment.
Systemy z uwięzią znajdują zastosowanie m.in. w technice satelitarnej, gdzie statek-matka i osprzęt satelitarny są złączone liną. By szczegółowo opisać ruch tego rodzaju układów, można modelować uwięź jako ciało elastyczne i stosować w obliczeniach metodę układów wieloczłonowych. W analizie i modelowaniu ciała podatnego - uwięzi, należy brać pod uwagę znaczne odkształcenia i przemieszczenia. By opisać dynamikę ciała podatnego można wykorzystać metodę układów wieloczłonowych, stosując sformułowanie w bezwzględnych współrzędnych węzłowych (Absolute Nodal Coordinate Formulation) i wprowadzając siły tłumienia. Celem weryfikacji metody modelowania, w przedstawionym studium proponuje się eksperymentalne podejście do identyfikacji parametrów. Przykładowe sterowanie wychyleniem, w którym wykorzystano genetyczny algorytm sterowania, zostało wykonane na drodze symulacji i eksperymentalnie. Zgodność modelu z rzeczywistością i użyteczność sterowania ruchem na podstawie analizy dynamiki układu wieloczłonowego zostały pokazane poprzez porównanie symulacji numerycznej i danych eksperymentalnych.
Źródło:
Archive of Mechanical Engineering; 2010, LVII, 2; 115-131
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Simulation of 2× 2Micro Strip Circular Patch Antenna Array at 28 GHz for 5G Mobile Station Application
Autorzy:
Hasan, Salim Abdullah
Ahmed, Abdulsattar Mohamed
Abdulqader, Mohanad Nawfal
Dawood, Younis Shareef
Powiązania:
https://bibliotekanauki.pl/articles/2200728.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
patch
5G
return loss
dielectric
array
divider
substrate
directivity
bandwidth
Opis:
This paper proposes the design and simulation of 2×2 circular patch antenna array working at 28 GHz by using four inset feed micro strip circular patch antennas to achieve beam forming with directivity around 13dB which is required to overcome part of high path loss challenge for high data rate mm-5G mobile station application. Four element 2x2 array consists of two 1x2 circular patch antenna arrays based on power divider and quarter wavelength transition lines as a matching circuit. The designed antenna array is simulated on RT/duroid 5880 dielectric substrate with properties of 0.5mm thickness, dielectric constant ε r =2.2, and tangent loss of 0.0009 by using Computer System Technology (CST) software. The performances in terms of return loss, 3D–radiation pattern is evaluated at 28 GHz frequency band. The design also includes the possibility of inserting four identical 2x2 antenna arrays at four edges of mobile station substrate to achieve broad space coverage by steering the beams of the mobile station arrays.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 4; 721--729
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Titanium Nitride Thickness as a Support Layer for Carbon Nanotubes Growth
Autorzy:
Ramli, Muhammad M.
Osman, Nurul H.
Darminto, D.
Abdullah, Mohd Mustafa Al Bakri
Powiązania:
https://bibliotekanauki.pl/articles/2125537.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
titanium nitride
support layer
carbon nanotubes
interconnection
Opis:
The effect of titanium nitride (TiN) thickness as the support layer for carbon nanotubes (CNTs) growth was investigated by depositing three different thicknesses: 20 nm, 50 nm and 100 nm. This TiN support layer was deposited on SiO2 pads before depositing nickel (Ni) as the catalyst material. The Ni distribution on different TiN thicknesses was studied under hydrogen environment at 600°C. Then, the samples were further annealed at 600°C in acetylene and hydrogen environment for CNTs growth. The results show that, the optimum TiN thickness was obtained for 50 nm attributed by the lowest D to G ratio (0.8).
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 3; 963--966
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Solid-To-Liquids and Na2SiO3-To-NaOH Ratio on Metakaolin Membrane Geopolymers
Autorzy:
Ibrahim, Masdiyana
Wan Ibrahim, Wan Mastura
Al Bakri Abdullah, Mohd Mustafa
Sauffi, Ahmad Syauqi
Vizureanu, Petrica
Powiązania:
https://bibliotekanauki.pl/articles/2106597.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
geopolymer
metakaolin membrane
porous geopolymer
solid-to-liquid (S/L) ratio
Na2SiO3/NaOH ratio
Opis:
Geopolymer is synthesized by polycondensation of SiO4 and AlO4 aluminosilicate complexes, tetrahedral frames linked with shared sialate oxygen. This paper studies the effect of the solids-to-fluids (S/L) and Na2SiO3/NaOH proportions on the preparing of metakaolin inorganic membrane geopolymer. By consolidating a mixture of metakaolin with sodium hydroxide, sodium silicate and foaming agent, the geopolymer membrane was made in required shape about 1 cm and cured at 80°C for 24 hours. After the curing process, the properties of the samples were tested on days 7. Sodium silicate (Na2SiO32SiO3
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 695--702
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the Accuracy of the Active Power Load Sharing in Paralleled Generators in the Presence of Drive Motors Shaft Speed Instability
Autorzy:
Awwad, Abdullah M. Eial
Al-Suod, Mahmoud M. S.
Al-Quteimat, Alaa M.
Ushkarenko, O. O.
AlHawamleh, Atia
Powiązania:
https://bibliotekanauki.pl/articles/1844522.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active load sharing
frequency instability
gas-powered diesel engine
optical sensor
rotor angular position
Opis:
The paper suggests an improved method of active power distribution among the gas-diesel generators operating in parallel; the method involves the control of torque and the angular positions of their rotors. The use of the suggested approach to the solution of the active power distribution task in the presence of instability of drive motor speed provides the increase of autonomous power system operation efficacy and rising the power unit’s performance. The authors analyzed the causes of generation of low-frequency fluctuations of generator drive engine speed; in autonomous electric power systems, gas diesel generators are increasingly used as such generator drive engines. It is suggested to use the developed method and structure of the optical device for control of rotation period and the measurement of the generator rotor angle position characterized with high accuracy, as the sensor. The authors developed a schematic diagram of active power distribution among the generators operating in parallel, which uses the cross feedback for gas-powered diesel engine shafts momentum and the generator rotor angle position. They obtained experimental results confirming the efficiency of the suggested active power distribution method and its practical implementation.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 3; 371-377
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of Tensile Properties of Glass Fibre Epoxy Laminated Composites Reinforced with Carbon Nanotubes interlayer using Electrospray Deposition
Autorzy:
Zakaria, Muhammad Razlan
Omar, Mohd Firdaus
Akil, Hazizan Md
Othman, Muhammad Bisyrul Hafi
Al Bakri Abdullah, Mohd Mustafa
Powiązania:
https://bibliotekanauki.pl/articles/2106596.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
glass fibre
carbon nanotubes
hybrid material
epoxy laminated composites
Opis:
The introduction of carbon nanotubes (CNTs) onto glass fibre (GF) to create a hierarchical structure of epoxy laminated composites has attracted considerable interest due to their merits in improving performance and multifunctionality. Field emission scanning electron microscopy (FESEM) was used to analyze the woven hybrid GF-CNT. The results demonstrated that CNT was successfully deposited on the woven GF surface. Woven hybrid GF-CNT epoxy laminated composites were then prepared and compared with woven GF epoxy laminated composites in terms of their tensile properties. The results indicated that the tensile strength and tensile modulus of the woven hybrid GF-CNT epoxy laminated composites were improved by up to 9% and 8%, respectively compared to the woven hybrid GF epoxy laminated composites.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 685--690
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Setting Time and after Setting Properties of High Calcium Fly Ash Geopolymers with Different Concentration of Sodium Hydroxide
Autorzy:
Mohamed, Rosnita
Razak, Rafiza Abd
Abdullah, Mohd Mustafa Al Bakri
Sofri, Liyana Ahmad
Aziz, Ikmal Hakem
Shahedan, Noor Fifinatasha
Powiązania:
https://bibliotekanauki.pl/articles/2106582.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high calcium fly ash geopolymers
setting time
heat evolved
early age properties
concentration of sodium hydroxide
Opis:
Setting time in geopolymers is known as the time taken for the transition phase of liquid to solid of the geopolymer system in which is represented in the initial setting and final setting. Setting time is significant specifically for application in the construction field. This study intends to determine the setting time of high calcium fly ash geopolymers and the properties of the geopolymers after setting (1-day age). This includes the determination of heat evolved throughout geopolymerization using Differential Scanning Calorimeter. After setting properties determination includes compressive strength and morphology analysis at 1-day age. High calcium fly ash was used as geopolymer precursor. Meanwhile, for mixing design, the alkali activator was a mixture of sodium silicate and sodium hydroxide (concentration varied from 6M-14M) with a ratio of 2.5 and a solid-to-liquid ratio of 2.5. From this study, it was found that high calcium fly ash geopolymer with 12M of NaOH has a reasonable setting time which is suitable for on-site application as well as an optimal heat evolved (-212 J/g) which leads to the highest compressive strength at 1-day age and no formation of microcracks observed on the morphology. Beyond 12M, too much heat evolved in the geopolymer system can cause micro-cracks formation thus lowering the compressive strength at 1-day age.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 563--567
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Analysis of Different Liquid Ratio on Metakaolin/Dolomite Geopolymer
Autorzy:
Syauqi Sauffi, Ahmad
Wan Mastura, Wan Ibrahim
Mohd Mustafa Al Bakri, Abdullah
Ibrahim, Masdiyana
Ahmad, Romisuhani
Ahmad Zaidi, Fakhryna
Powiązania:
https://bibliotekanauki.pl/articles/2048822.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
geopolymer
metakaolin
dolomite
phase analysis
Opis:
Geopolymer is widely studied nowadays in various scope of studies. Some of the ongoing studies are the study of the various materials towards the geopolymer strength produced. Meanwhile, some of the studies focus on the mixing of the geopolymer itself. This paper discussed the phase analysis of metakaolin/dolomite geopolymer for different solid to the liquid ratio which was, 0.4, 0.6, 0.8, and 1.0, and the properties that affected the geopolymer based on the phases. The constant parameters in this study were the percentage of metakaolin and dolomite used. The metakaolin used was 80% meanwhile dolomite usage was 20%. Besides that, the molarity of NaOH used is 10M and the alkaline activator ratio used is 2.0. All the samples were tested at 28 days of curing. The results show that the 0.8 solid to the liquid ratio used gave better properties compare to other solid to liquid ratio. The phases analyzed were quartz, sillimanite, mullite, and faujasite. The 0.8 S/L ratio shows the better properties compared to others by the test of phase analysis, compressive strength morphology analysis, and functional group analysis.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 247-250
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of bolt configurations on stiffness for steel-wood-steel connection loaded parallel to grain for softwoods in Malaysia
Autorzy:
Razim, Nur Liza
Sheng, Francis Ting Shyue
Karim, Abdul Razak Abdul
Nabialek, Marcin
Abdullah, Mohd Mustafa Al Bakri
Sroka, Marek
Powiązania:
https://bibliotekanauki.pl/articles/2174044.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sztywność
analiza elementów skończonych
połączenie śrubowe
połączenie stal-drewno-stal
drewno miękkie
Eurokod 5
stiffness
finite element analysis
bolt connection
steel-wood-steel connection
softwood
Eurocode 5
Opis:
Steel-wood-steel connection is widely seen in many applications, such as timber structures. The stiffness of steel-wood-steel connection loaded parallel to grain for softwoods originated from Malaysia was investigated in this study. Numerical models have been developed in ABAQUS to study the stiffness connection. Softwoods of Damar Minyak and Podo have been selected in this analysis. The comprehensive study focused on the effect of bolt configurations on stiffness. Numerical analysis is carried out and the developed model has been validated with the previous study. Further investigations have been made by using the validated model. From this model, numerical analysis of the stiffness values have been made for various bolt configurations, including bolt diameter, end distance, bolt spacing, number of rows and bolts and edge distance. The result shows that the stiffness of bolted timber connections for softwood depends on the bolt diameter, number of rows and bolts, end distance and edge distance. Based on the result, stiffness increased as the diameter of the bolt, end distance, number of rows and bolts and edge distance increased. It is also discovered that the stiffness equation in Eurocode 5 (EC5) is inadequate as the equation only considered parameters which are wood density and bolt diameter. Other connection parameters such as geometry are not considered in the EC5 equation.
Źródło:
Archives of Civil Engineering; 2022, 68, 3; 323--338
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Injection Moulding Process via Design of Experiment (DOE) Method based on Rice Husk (RH) Reinforced Low Density Polyethylene (LDPE) Composite Properties
Autorzy:
Jaya, Haliza
Zulkepli, Nik Noriman
Omar, Mohd Firdaus
Abd Rahim, Shayfull Zamree
Nabiałek, Marcin
Jeż, Kinga
Al Bakri Abdullah, Mohd Mustafa
Powiązania:
https://bibliotekanauki.pl/articles/2106601.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
injection moulding
design of experiments
DOE
central composite design
response surface methodology
RSM
shrinkage
tensile strength
Opis:
Optimal parameters setting of injection moulding (IM) machine critically effects productivity, quality, and cost production of end products in manufacturing industries. Previously, trial and error method were the most common method for the production engineers to meet the optimal process injection moulding parameter setting. Inappropriate injection moulding machine parameter settings can lead to poor production and quality of a product. Therefore, this study was purposefully carried out to overcome those uncertainty. This paper presents a statistical technique on the optimization of injection moulding process parameters through central composite design (CCD). In this study, an understanding of the injection moulding process and consequently its optimization is carried out by CCD based on three parameters (melt temperature, packing pressure, and cooling time) which influence the shrinkage and tensile strength of rice husk (RH) reinforced low density polyethylene (LDPE) composites. Statistical results and analysis are used to provide better interpretation of the experiment. The models are form from analysis of variance (ANOVA) method and the model passed the tests for normality and independence assumptions.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 2; 719--727
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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