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Tytuł:
Study of flow softening mechanisms of a nickel-based superalloy with o phase
Autorzy:
Lin, Y. C.
He, D.-G
Chen, M. S.
Chen, X.-M.
Zhao, C.-Y.
Ma, X.
Powiązania:
https://bibliotekanauki.pl/articles/958203.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloys
hot deformation
flow softening behavior
microstructural evolution
Opis:
The flow softening behaviors of a nickel-based superalloy with o phase are investigated by hot compression tests over wide ranges of deformation temperature and strain rate. Electron backscattered diffraction (EBSD). optical microscopy (OM), and scanning electron microscopy (SEM) are employed to study the flow softening mechanisms of the studied superalloy. It is found that the flow softening behaviors of the studied superalloy are sensitive to deformation temperature and strain rate. At high strain rate and low deformation temperature, the obvious flow softening behaviors occur. With the increase of deformation temperature or decrease of strain rate, the flow softening degree becomes weaken. At high strain rate (1s-1), the flow softening is mostly induced by the plastic deformation heating and flow localization. However, at low strain rate domains (0.001-0.01s-1), the effects of deformation heating on flow softening are slight. Moreover, the flow softening at low strain rates is mainly induced by the discontinuous dynamic recrystallization and the dissolution of 6 phase (Ni3Nb).
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1537-1546
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting Pinning by Magnetic Domains in a Ferromagnet-Superconductor Bilayer
Autorzy:
Cieplak, M. Z.
Adamus, Z.
Konczykowski, M.
Chen, X. M.
Byczuk, A.
Abal'oshev, A.
Sang, Hai.
Chien, C. L.
Powiązania:
https://bibliotekanauki.pl/articles/2041450.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Ha
74.25.Qt
74.78.Db
74.78.Fk
Opis:
The local flux profile and the critical current are studied using an array of Hall sensors in a ferromagnetic-superconducting bilayer which consists of niobium film covering ferromagnetic Co/Pt multilayer with perpendicular magnetic anisotropy. The results indicate about threefold enhancement of the flux pinning in niobium layer caused by the isolated magnetic domains which are created during the magnetization reversal of the Co/Pt multilayer. The geometrical barrier is absent, and the critical current is strongly peaked in close vicinity to the sample center, suggesting that the critical state differs from that predicted by the Bean model.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 693-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Inverted Torsion Pendulum-Based Mechanical Spectrometer to Study Soft Matter
Autorzy:
Lei, M. L.
Chen, L.
Xiong, X. M.
Powiązania:
https://bibliotekanauki.pl/articles/351272.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
soft matter
mechanical spectrometer
inverted torsion pendulum
viscoelasticity
mechanical spectroscopy
viscosity
Opis:
A new multifunctional mechanical spectrometer is developed based on an inverted torsion pendulum showing high precision in a wide frequency range to study soft matter. Apart from measuring the internal friction of solids it can also be used to study viscoelasticity. In this report we describe basic principles of the novel instrument.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 13-16
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaching kinetic study of Y and Eu from waste phosphors using hydrochloric acid solution containing hydrogen peroxide
Autorzy:
Yu, M.
Jiang, Z.
Mei, G.
Chen, X.
Powiązania:
https://bibliotekanauki.pl/articles/949690.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
waste phosphors
leaching
kinetics
rare earth elements
Opis:
The leaching kinetics of Y and Eu from waste phosphors using a hydrochloric acid (HCl) solution containing hydrogen peroxide (H2O2) were investigated. Characterization of the waste phosphors was performed using XRD to ascertain the phases as (Y0.95Eu0.05)2O3 (red phosphors), (Ce0.67Tb0.33)MgAl11O19 (green phosphors), (Ba0.9Eu0.1)Mg2Al16O27 (blue phosphors), and SiO2 (quartz). The influence of factors such as HCl concentration, addition amount of H2O2, temperature, and reaction time on the leaching performance of Y and Eu was investigated. The maximum leaching recoveries of Y (99.87%) and Eu (88.72%) were obtained at 4 M HCl, 0.2 cm3/g H2O2, 60 ℃ temperature, and 180 min of reaction time at a liquid-to-solid ratio of 7.5 cm3/g. Leaching kinetic results showed the best fit with the shrinking sphere model (1-(1-x)1/3)=kct), ensuring that the overall leaching process was governed by a chemical control mechanism. Activation energies of 42.35 and 33.28 kJ/mol were acquired for leaching of Y and Eu, respectively, at 40-70 ℃, which further supports the proposed chemical control leaching process.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 2; 238-248
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“Noise” in climatologically driven ocean models with different grid resolution
Autorzy:
Tang, S.
von Storch, H.
Chen, X.
Zhang, M.
Powiązania:
https://bibliotekanauki.pl/articles/48986.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
climate system
noise
nonlinear model
high-dimensional nonlinear model
macroturbulence
spatial distribution
daily variation
South China Sea
Źródło:
Oceanologia; 2019, 61, 3
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surfactant assisted removal of engine oil from synthetic soil
Autorzy:
Ramamurthy, A. S.
Chen, Z.
Li, X.
Azmal, M.
Powiązania:
https://bibliotekanauki.pl/articles/207953.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
sodium dodecyl sulfate
SDS
desorption
polyethylene oxides
sodium
sodium sulfate
soils
surface active agents
dodecylosiarczan sodu
surfaktanty anionowe
desorpcja
tlenki polietylenu
sód
siarczan sodowy
gleba
środki powierzchniowo czynne
detergenty
Opis:
Effectiveness of surfactants SDS (sodium dodecyl sulfate), AOT (sodium dioctyl sulfosuccinate) and Brij 35 (polyoxyethylene lauryl ether) in removing residual oil from soils have been determined. Experimental results indicated that oil desorption efficiencies with surfactants are 7 to 18 times higher than using water alone. 0.6% Brij 35 at was the most effective surfactant to remove oil from soil, and it did not display any significant change in oil desorption with pH changes. A comparison study also showed that pore volume was a more significant parameter than soil washing flow rate to improve oil desorption.
Źródło:
Environment Protection Engineering; 2015, 41, 2; 67-79
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation and Characterisation of PSA/CNT/TiO2 Nano Composites and Fibres
Przygotowanie i charakterystyka nanokompozytów PSA/CNT/TiO2 i wykonanych z nich włókien
Autorzy:
Xin, B J
Chen, Z M
Wu, X. J.
Powiązania:
https://bibliotekanauki.pl/articles/232556.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
nanocomposites
electrical conductivity
ultraviolet resistance
nanokompozyty
przewodnictwo elektryczne
odporność ultrafioletowa
stabilność termiczna
Opis:
Polysulfonamide/carbon nanotubes/titanium dioxide (PSA/CNT/TiO2) nano composite spinning solutions with different CNT/TiO2 contents were prepared using the physical blending method. The corresponding fibers were extruded through a set of wet spinning unit, and composite membranes were prepared by the spin-coating method. The performances of the PSA/CNT/TiO2 nano fibers and membranes were investigated by means of SEM, FTIR and XRD etc. The influence of CNT and TiO2 on the mechanical properties, thermal stability, electrical conductivity and ultraviolet resistance of PSA nano composites was also analysed in this study. The experimental results showed that low contents of CNT/TiO2 can be distributed homogeneously in the PSA matrix; the molecular structure and chemical composition of PSA did not changed obviously; crystallisation in PSA occured at low CNT/TiO2 contents because it can act as a nucleation agent; the electrical conductivity and ultraviolet resistance of PSA nano composites can be improved significantly by blending CNT/TiO2 into the PSA matrix.
Przygotowano przędący roztwór nanokompozytów polisulfonamid/nanorurki węglowe/dwutlenek tytanu (PSA/CNT/TiO2) o różnej zawartości CNT/TiO2. Zastosowano system przędzenia na mokro z wytłaczaniem włókien przez zestaw filierowy, membrany kompozytowe przygotowano stosując metodę powlekania. Właściwości nanowłókien PSA/CNT/TiO2 i błon badano za pomocą SEM, FTIR i dyfrakcji rentgenowskiej. Zbadano również wpływ CNT i TiO2 na właściwości termiczne, stabilność termiczną, przewodność elektryczną i odporność na promienie UV nanokompozytów PSA. Wyniki badań wykazały, że przy niskiej zawartość CNT/TiO2 można uzyskać równomierne rozłożenie nanocząstek w matrycy polimerowej PSA bez zmian struktury molekularnej i składu chemicznego PSA; krystalizacja w PSA zachodzi również przy niskiej zawartości CNT/TiO2, gdzie cząsteczki wypełniacza służą jako zarodki krystalizacji; polepszenie przewodności elektrycznej i właściwości barierowych przeciw UV można uzyskać przez dodanie do matrycy PSA badanych dodatków.
Źródło:
Fibres & Textiles in Eastern Europe; 2013, 1 (97); 24-28
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayesowski model wzrostu niezawodności oparty na dynamicznych parametrach rozkładu
Bayesian reliability growth model based on dynamic distribution parameters
Autorzy:
Tao, Y.
Zhang, Y. A.
Chen, X.
Ming, M.
Powiązania:
https://bibliotekanauki.pl/articles/301037.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
statystyka populacji niejednorodnej
model monotoniczny
Bayes
model przyrostu niezawodności
rozkład wykładniczy
non-homo geneous population statistics
monotone model
reliability growth model
exponential distribution
Opis:
W artykule przestudiowano metody analizy statystycznej na różnych etapach wzrostu niezawodności w oparciu o model monotoniczny. Zamodelowano zmiany jakim dynamiczne parametry rozkładu podlegają podczas badań. Podano bayesowskie modele wzrostu niezawodności dla licznych etapów wzrostu niezawodności. Na koniec metodę zweryfikowano w oparciu o przykład praktyczny.
In this paper we study the statistical analysis methods at different stages of reliability growth based on the monotone model. The changes of dynamic distribution parameters during test are modeled. Bayesian reliability growth models for multiple stages of reliability growth are given. Finally the method is validated by a practical example.
Źródło:
Eksploatacja i Niezawodność; 2010, 2; 13-16
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elastic and Thermodynamic Properties of Anti-Perovskite Type Superconductor $MCNi_3$ (M = Zn, Cd)
Autorzy:
Duan, M.
Tan, J.
Ji, G.
Chen, X.
Zhu, J.
Powiązania:
https://bibliotekanauki.pl/articles/1535766.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
62.20.D-
91.60.Gf
Opis:
The elastic and thermodynamic properties of the anti-perovskite superconductor $ZnCNi_3$ and $CdCNi_3$ are investigated by first-principles calculations. With the local density approximation as well as the generalized gradient approximation for exchange and correlation, the ground state properties and equation of state are obtained, which agree well with other theoretical calculations and experiments. Furthermore, by the elastic stability criteria, we predict that $ZnCNi_3$ and $CdCNi_3$ are not stable above 98.1 GPa and 196.5 GPa, respectively. The dependences of the heat capacity, thermal expansion coefficient, the Grüneisen parameter and bulk modulus ($B_{T}$ and $B_{S}$) on pressure and temperature for $ZnCNi_3$ and $CdCNi_3$ are also obtained successfully.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 652-658
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison and Analysis of Magnetic-Geared Permanent Magnet Electrical Machine at No-Load
Autorzy:
Liu, X.
Chen, D.
Yi, L.
Zhang, Ch.
Wang, M.
Powiązania:
https://bibliotekanauki.pl/articles/140663.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetic gear
MGPM electrical machine
quantitative comparison
finite element analysis
no load
Opis:
Magnetic-geared permanent magnet (MGPM) electrical machine is a new type of machine by incorporating magnetic gear into PM electrical machine, and it may be in operation with low-speed, high-torque and direct-driven. In this paper, three types of MGPM machines are present, and a quantitative comparison among them is performed by finite element analysis (FEA). The magnetic field distribution, stable torque and back EMF are obtained at no-load. The results show that three types of MGPM machine are suitable for different application fields respectively according to their own advantages, such as high torque and back EMF, which form an important foundation for MGPM electrical machine research.
Źródło:
Archives of Electrical Engineering; 2014, 63, 4; 683-692
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaching of heavy metals from MSWI fly ash : experiments vs. simulation
Autorzy:
Qiu, Q
Jiang, X.
Chen, Z.
Lu, S.
Ni, M.
Powiązania:
https://bibliotekanauki.pl/articles/205253.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
simulation
MSWI fly ash
microwave
hydrothermal treatment
Visual MINTEQ
Opis:
In this work, pH-dependence experiments and leaching modeling using Visual MINTEQ were performed to evaluate the stability and simulate the leaching characteristics of heavy metals in municipal solid waste incineration (MSWI) fly ash. Modeling the equilibrium concentration of Cd, Cu, Cr, Ni, Pb and Zn in raw and treated fly ash was the main target and was conducted over a pH range of 0.5–14. In addition, simulation of the leaching behavior of MSWI fly ash with different additives was also conducted. The treated fly ash was solidified by a microwave-assisted hydrothermal process with added phosphate. The initial elemental concentrations of MSWI fly ash, including raw and treated fly ash, were detected by a microwave apparatus and inductively coupled plasma atomic emission spectroscopy (ICP-AES). The ICP-AES analysis showed that most leaching concentrations of treated fly ash decreased considerably compared to the raw fly ash. The simulation results indicated that the dissolution/precipitation simulation models of Zn, Cu and Pb were broadly consistent with the experimental results, while the leaching behaviors of Ni, Cr and Cd were determined by both dissolution/precipitation and surface complexation mechanisms. In addition, the models of reagent solidification revealed that the stabilization effect of Na2S was better than that of Na2CO3. This model will be useful in the evaluation of the leaching concentrations of heavy metals in fly ash.
Źródło:
Archives of Environmental Protection; 2018, 44, 2; 55-61
2083-4772
2083-4810
Pojawia się w:
Archives of Environmental Protection
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability of air nucleus in liquid water and cavitation inception on marine engineering
Autorzy:
Fu, Q.
Chen, M.
Wang, X.
Zhu, R.
Zhang, G.
Powiązania:
https://bibliotekanauki.pl/articles/260137.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
air nuclei
water
molecular dynamics
stability
surface tension
Opis:
The micro air nucleus widely distributed in the ocean is a necessary condition for the cavitation of hydraulic machinery in seawater. In order to study the stability of air nucleus in seawater and cavitation inception, the computational domain of water molecules with air nucleus was studied using the method of molecular dynamics simulation, and the transient characteristics of air nucleus in liquid water were obtained. The key factors influencing nuclei stability were analyzed. The results showed that air nucleus with a certain mass could maintain the dynamic equilibrium in liquid water. The internal density of air nuclei had a critical value that allowed the nuclei to stably exist in water. The air nuclei mass was the decisive factor in its equilibrium volume in water, and the two were positively correlated. The internal density of air nuclei was negatively correlated with the nuclei radius when the nuclei was stable in water. Liquid surface tension was an important factor affecting the stability of the air nuclei. The larger the initial radius of nuclei, the smaller the water pressure, and the more likely the cavitation occurs.
Źródło:
Polish Maritime Research; 2018, S 3; 111-119
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated design of observer based fault detection for a class of uncertain nonlinear systems
Autorzy:
Chen, W.
Khan, A, Q.
Abid, M.
Ding, S. X.
Powiązania:
https://bibliotekanauki.pl/articles/907595.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
detekcja uszkodzeń
obserwator
system nieliniowy
optymalizacja
odporność
fault detection
observer
nonlinear system
optimization
robustness
Opis:
Integrated design of observer based Fault Detection (FD) for a class of uncertain nonlinear systems with Lipschitz nonlinearities is studied. In the context of norm based residual evaluation, the residual generator and evaluator are designed together in an integrated form, and, based on it, a trade-off FD system is finally achieved in the sense that, for a given Fault Detection Rate (FDR), the False Alarm Rate (FAR) is minimized. A numerical example is given to illustrate the effectiveness of the proposed design method.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2011, 21, 3; 423-430
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring of high-speed shaft of gas turbine using artificial neural networks: predictive model application
Autorzy:
Rahmoune, M. B.
Hafaifa, A.
Abdellah, K.
Chen, X. Q.
Powiązania:
https://bibliotekanauki.pl/articles/328726.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
monitoring
gas turbine
vibrations
artificial neural networks
predictive model
turbina gazowa
drgania
sztuczna sieć neuronowa
model predykcyjny
Opis:
The automatic engineering known a very rapid progress with the consequent development of numerical methods and computer systems, by the growth of computational capacity. In this context, this work proposes a strategy of predictive control of the high-pressure shaft speed of a gas turbine using artificial neural networks in order to monitor the vibratory behavior of this rotating machine. This approach makes it possible to ensure the stability of this turbine under real conditions and to detect any deviation of their dynamic behavior from the margin of safety. This approach makes it possible to include the control limitations on the turbine variables in the modeling step of the high-speed shaft speed controller.
Źródło:
Diagnostyka; 2017, 18, 4; 3-10
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Diagrams of the MeNQ/HN and HN/NQ Binary Systems
Autorzy:
Tian, M.-M.
Li, H.-R.
Chen, L.
Ju, X.
Shu, Y.-J.
Powiązania:
https://bibliotekanauki.pl/articles/358436.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
phase diagram
binary system
eutectic
DSC
XRD
Opis:
An equation for a binary phase diagram with two eutectic points was deduced from the Van’t Hoff equation. The melting points of hydrazinium nitrate/ nitroguanidine (HN/NQ) samples with different ratios, ranging from 0 to 1 mole fraction, were explored by differential scanning calorimetry (DSC). The results revealed the presence of two eutectic points in the phase diagram of the HN/NQ binary system. The dependence of temperature on the composition (T-X phase diagram) of HN/NQ was depicted based on the equation described by the DSC data. The phase diagram of MeNQ/HN, with only one eutectic point was constructed by substituting experimental data of the compositions and their corresponding temperatures into the Van’t Hoff equation. The phase diagram with two or more eutectic points indicated the formation of new stable compounds with appropriate ratios of the two components; no new substance appeared in the system with only one eutectic point. Thus, the HN/NQ binary system showed the presence of a new substance, which is probably the HN/NQ co-crystal. No new substance was detected in the MeNQ/HN binary system. The results of the X-ray diffraction patterns agree with the findings from the phase diagrams.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 2; 271-286
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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