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Wyświetlanie 1-15 z 31
Tytuł:
Unusual Electron Transport Properties of $U_{0.05}Y_{0.95}Al_2$
Autorzy:
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1813710.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Jf
72.15.Qm
Opis:
We report a detailed study of the resistivity (ρ(T)) and thermoelectric power (S(T)) of the alloy $U_{0.05}Y_{0.95}Al_2$, which crystallises in the cubic $MgCu_2$-type structure. The resistivity is found to follow ρ(T) ∝ ln T between 15 and 40 K and a quasi-linear temperature dependence $-T^{1.16}$ for T <10 K. At a magnetic field of 9 T a Kondo-type maximum occurs in the resistivity data at 7 K, below which the Fermi liquid behaviour (ρ(T) ∝ $T^2$) is recovered. S(T)/T shows a $T^{0.5}$ power law for T <12 K. The low-temperature unconventional features observed in $U_{0.05}Y_{0.95}Al_2$ are presumably due to the presence of the two-channel Kondo effect.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 387-390
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Structure of Th₇Ru₃
Autorzy:
Sahakyan, M.
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1031027.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Mb
71.15.Rf
71.18.+y
71.20.-b
74.20.Mn
74.20.Rp
Opis:
We report the results of scalar and fully relativistic electronic structure calculations for nonsuperconducting Th₇Ru₃, using the full-potential linearized-muffin-thin-orbital and full-potential linearized augmented-plane wave methods. The obtained data, including electronic band structures, density of states, Fermi surfaces and electron localization function, reveal the presence of anisotropic spin-orbit coupling but its strength, exposed by splitting energies of the order of 10-40 meV, is much weaker as compared to those of Th₇Fe₃ or Th₇Co₃ superconductors. Moreover, the lack of Van Hove singularity near the Fermi level underscores a key point of the non-occurrence of superconductivity in the studied compound.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 751-754
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$Ru_3Sn_7$: Phonon Reference for Superconducting $Mo_3Sb_7$
Autorzy:
Tran, V.
Miiller, W.
Powiązania:
https://bibliotekanauki.pl/articles/1810300.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.40.-b
72.15.Eb
74.25.Kc
74.25.Bt
72.15.Qm
Opis:
In order to search for phonon reference for dimer-gapped superconducting $Mo_3Sb_7$, measurements of specific heat $(C_p(T))$ and electrical resistivity (ρ(T)) of $Ru_3Sn_7$ were performed in the temperature range 2-300 K. The phonon part of $C_p(T)$ and ρ(T) of $Ru_3Sn_7$ can satisfactorily be explained describing the spectrum with one Einstein and two Debye modes. We found $Θp_{E}$ ≈ 100 K, $Θp_{D1}$ ≈ 185 K and $Θp_{D2}$ ≈298 K. The magnetic specific heat of $Mo_3Sb_7$ exhibits a sharp maximum at T*= 50 K, below which follows a gap function. Magnetic resistivity increases as -lnT with decreasing temperature and shows maximum at T*.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 83-85
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of the Superconductor $Mo_3Sb_7$
Autorzy:
Tran, V.
Bukowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1812274.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Bt
74.70.-b
Opis:
We synthesized a polycrystalline sample of the superconductor $Mo_3Sb_7$ and characterized its basic properties by measurements of magnetization, electrical resistivity and specific heat. The measurements establish a superconducting phase transition at $T_c$=2.25 (0.05) K. In applied magnetic fields, the magnetization and resistivity show the behavior of type-II superconductor. From the specific heat measurement, the electronic specific heat coefficient,γ, specific heat jump at $T_c,$ $ΔC(T_c)//γT_c,$ and the Debye temperature $Θ_D$, are evaluated to be 34.5 mJ/(mol $K^2$), 1.56 and 283 K, respectively. From analysis of the specific heat data we suggest that this compound belongs to an intermediate strong coupling regime in the BCS context. The observed enhancement in theγ-value suggests a substantial contribution of Mo-4d-electrons to the density of states. Our experimental data do not support interpretation of superconductivity in $Mo_3Sb_7$ in terms of neither unconventional superconductivity or spin fluctuations proposed previously.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 67-74
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intriguing Magnetoresistivity of $URh_{0.62}Ru_{0.38}Ge$ in the Non-Fermi Liquid Regime
Autorzy:
Miiller, W.
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1810409.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.10.Hf
71.20.Lp
71.27.+a
Opis:
Magnetoresistivity of $URh_{0.62}Ru_{0.38}Ge$ solid solution was measured in the temperature range 0.35-300 K and in magnetic fields up to 9 T. For the studied system, which lies on the border of ferromagnetism, we observe positive magnetoresistivity in the non-Fermi liquid regime. The finding is in striking disagreement with scenario predicted for ferromagnetic quantum critical point.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 144-146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Band Structure of Ru₃Sn₇
Autorzy:
Sahakyan, M.
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1385432.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Ap
31.15.A-
74.20.Pq
Opis:
The first-principle band structure calculations for Ru₃Sn₇ and Mo₃Sb₇ were carried out using the full-potential linearized muffin tin orbital method. It was shown that the valence band contribution is mainly due to the 4d electrons of Ru(Mo), while the contribution from the 5p-Sn(Sb) orbitals is relatively small. Furthermore, the 4d and 5p orbitals located near the Fermi level have the non-hybridized characters, thus presumably contributing independently to the total density of states. A comparison of the density of states of two compounds reveals an essential difference in the structures and magnitudes. We estimated the mass enhancement factor and Stoner product and discussed these differences regarding to electronic and magnetic behaviour of these compounds.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 303-305
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Fermi-Liquid State in $URu_{0.68}Pd_{0.32}Ge$
Autorzy:
Tran, V.
Gralak, D.
Powiązania:
https://bibliotekanauki.pl/articles/1385459.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
75.30.Mb
75.40.Cx
75.45.+j
Opis:
We report the measurements of dc-magnetization (M), specific heat $(C_{p})$ and electrical resistivity (ρ) of an intermetallic $URu_{0.68}Pd_{0.32}Ge$, that lies at the border between nonmagnetic and magnetic regimes in the magnetic phase diagram of solid solutions $URu_{1-x}Pd_{x}Ge$. The studied composition shows enhanced dc-magnetic susceptibility χ(T) and the Sommerfeld ratio $C_{p}(T)$/T at low temperatures. Below 4 K χ(T), $C_{p}(T)$/T and ρ(T) can be described by χ(T) ∝ $T^{-0.48}$, $C_{p}(T)$/T ∝ √T and ρ(T) ∝ c ln(T)+$AT^{3/2}$, respectively. These observations provide an evidence that $URu_{0.68}Pd_{0.32}Ge$ is a moderately heavy-fermion system with an electronic ground state of non-Fermi liquid character. We found non-linear effect of the magnetization and a large value of the Wilson ratio, which are consistent with the interpretation in terms of magnetic instability.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 312-314
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport Properties of the U$\text{}_{1-x}$Th$\text{}_{x}$Pt System
Autorzy:
Tran, V. H.
Troć, R.
Powiązania:
https://bibliotekanauki.pl/articles/2013010.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Eb
72.15.Gd
75.70.Pa
Opis:
We present the results of measurements of electrical resistivity (ρ(T)) and magnetoresistance (Δϱ/ϱ$\text{}_{0}$(T)) on the solid solutions U$\text{}_{1-x}$Th$\text{}_{x}$Pt (x=0-0.8). The Curie temperature (T$\text{}_{c}$=21 K) found for the parent compound UPt, is steadily reduced upon the Th-substitution. The ρ(T) and Δϱ/ϱ$\text{}_{0}$(T) functions provide evidence of electron scattering due to spin fluctuations. The most interesting feature of Δϱ/ϱ$\text{}_{0}$ is its high value of about -22% found for UPt and U$\text{}_{0.9}$Th$\text{}_{0.1}$Pt at their T$\text{}_{c}$ and B=8 T. For samples with x ≥ 0.2, the value of Δϱ/ϱ$\text{}_{0}$ at 4 K and 8 T increases with x and becomes positive for Th-composition x >= 0.6.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 399-402
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anomalous Magnetic Properties of URuGa
Autorzy:
Tran, V. H.
Troć, R.
Powiązania:
https://bibliotekanauki.pl/articles/1964580.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.15.Qm
75.40.Cx
75.80.+q
Opis:
We present data of the magnetic susceptibility χ(T) and electrical resistivity ρ(T) for the hexagonal URuGa (space group P6̅2m). Below 7 K, χ increases rapidly and the data can be described by the expression χ(T) = χ(0)(1-a√T). ρ(T) in zero field follows the activated form: ρ(T)∼ exp(E$\text{}_{a}$/2k$\text{}_{B}$T ) with E$\text{}_{a}$ = 1.9 meV. In an applied magnetic field of 1 T, the resistivity varies as ρ(T)∼ bT. Between 18 and 250 K the resistivity is linear in -lnT and consistent with a Kondo-like effect.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 299-302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybridization Effects in UCu$\text{}_{5-x}$Au$\text{}_{x}$ Compounds
Autorzy:
Tran, V. H.
Troć, R.
Powiązania:
https://bibliotekanauki.pl/articles/1929857.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.28.+d
Opis:
We review the results of bulk and neutron diffraction measurements on the UCu$\text{}_{5-x}$Au$\text{}_{x}$ system crystallizing in the cubic AuBe$\text{}_{5}$-type structure. The observed properties may be understood in the light of competition between Kondo effect and RKKY exchange interactions. Effects of 5f-ligand hybridization between the U-atoms occupying the 4a-sites and the Au- or/and Cu-atoms placed at the 4c- and 16e-positions, respectively, are supposed to be different. We show that the prefential occupation of 4c-sites by Au has a marked effect on the magnetic properties of the investigated system.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 287-292
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermoelectric Power of the $URu_{1-x}Pd_{x}Ge$ System
Autorzy:
Gralak, D.
Toliński, T.
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1385279.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
75.50.Ee
72.15.Jf
Opis:
We report the measurements of thermoelectric power, S(T), of the $URu_{1-x}Pd_{x}Ge$ solid solutions in the temperature range 1.9-300 K. It is found that S(T) of URuGe is consistent with the behaviour of Kondo lattice, characterized by a low-temperature negative minimum and a high-temperature positive maximum. On the contrary, S(T) of the compositions 0.1 ≤ x ≤ 0.7 is negative over the whole temperature range measured and shows only one negative minimum around 200 K. The compositions x = 0.9 and 1, in addition to a high-temperature negative minimum, exhibit anomalies at low temperatures, presumably associated with the magnon drag. We interpret the experimental data assuming the presence of the Kondo and crystal-electric field effects.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 287-289
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimizing control by robustly feasible model predictive control and application to drinkingwater distribution systems
Autorzy:
Tran, V. N.
Brdys, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/91723.pdf
Data publikacji:
2011
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
optimizing
model predictive control
MPC
Robustly Feasible MPC
RFMPC
Drinking
Water Distribution Systems
DWDS
genetic algorithm
Opis:
The paper considers optimizing Model Predictive Control (MPC) for nonlinear plants with output constraints under uncertainties. Although the MPC technology can handle the constraints in the model by solving constraint model based optimization task, satisfying the plant output constraints under the model uncertainty still remains a challenge. The paper proposes Robustly Feasible MPC (RFMPC), which achieves feasibility of the outputs in the controlled plant. The RFMPC which is applied to control quantity in Drinking Water Distribution Systems (DWDS) is illustrated by application to the DWDS example. In the simulation exercise, Genetic Algorithm is selected as the optimization solver and the reduced search space methodology is applied in the implementation under MATLABEPANET environment.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 1; 43-57
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machine fault diagnosis and condition prognosis using classification and regression trees and neuro-fuzzy inference systems
Autorzy:
Tran, V. T.
Yang, B. S.
Powiązania:
https://bibliotekanauki.pl/articles/971018.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
fault diagnosis
classification
induction motors
decision trees
forecasts
fuzzy systems
Opis:
This paper presents an approach to machine fault diagnosis and condition prognosis based on classification and regression trees (CART) and neuro-fuzzy inference systems (ANFIS). In case of diagnosis, CART is used as a feature selection tool to select pertinent features from data set, while ANFIS is used as a classifier. The crisp rules obtained from CART are then converted to fuzzy if-then rules, employed to identify the structure of ANFIS classifier. The hybrid of back-propagation and least squares algorithm are utilized to tune the parameters of the membership functions. The data sets obtained from vibration signals and current signals of the induction motors are used to evaluate the proposed algorithm. In case of prognosis, both of these models in association with direct prediction strategy for long-term prediction of time series techniques are utilized to forecast the future values of machine operating condition. In this case, the number of available observations and the number of predicted steps are initially determined by false nearest neighbor method and auto mutual information technique, respectively. These values are subsequently utilized as inputs for prediction models. The performance of the proposed prognosis system is then evaluated by using real trending data of a low methane compressor. A comparative study of the predicted results obtained from CART and ANFIS models is also carried out to appraise the prediction capability of these models. The results of the proposed methods in both cases indicate that CART and ANFIS offer a potential for machine fault diagnosis and for condition prognosis.
Źródło:
Control and Cybernetics; 2010, 39, 1; 25-55
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $URu_{1-x}Pd_{x}Ge$ Solid Solutions
Autorzy:
Gralak, D.
Zaleski, A.
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1371286.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
75.30.-m
75.50.-y
Opis:
The magnetic properties of the solid solutions $URu_{1-x}Pd_{x}Ge$ with x = 0.1 - 0.9, crystallizing in the orthorhombic TiNiSi-type structure, were investigated by ac magnetic susceptibility and dc magnetization measurements. The experimental data reveal that there are three different regions of magnetic behaviour. A nonmagnetic ground state occurs for x < 0.3, however, as the Pd concentration is increased, the antiferromagnetism is stabilized for x=0.35 - 0.8, and two successive transitions, antiferro- and ferromagnetic, emerge in the x=0.9 composition.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 314-315
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Yttrium Substitution οn the Electronic Structure and Magnetic Moment οf $Gd_{7-x}Y_{x}Pd_{3}$ (x = 0, 1, 2, 3, 4)
Autorzy:
Klimczak, M.
Talik, E.
Tran, V.
Powiązania:
https://bibliotekanauki.pl/articles/1810460.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
71.28.+d
75.40.Cx
75.60.Ej
Opis:
The electronic structure and magnetic properties of $Gd_{7-x}Y_{x}Pd_{3}$ (x = 0, 1, 2, 4) single crystals were examined. These compounds crystallized in the same crystal structure type $(Th_{7}Fe_{3})$ with the same c/a ratio of 0.63. A strongly anisotropic behavior of the magnetic and transport properties was found. Magnetic frustration and spin fluctuations on the palladium atoms are responsible for the complex magnetic properties of this ternary compound. As a part of current research we presented further characteristic of the $Gd_{7-x}Y_{x}Pd_{3}$ (x = 0, 1, 2, 4) single crystal.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 200-202
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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