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Wyświetlanie 1-15 z 66
Tytuł:
Dipolar Contributions to Magnetoelastic Energy of Crystal Grains with Interfaces
Autorzy:
Szumiata, T.
Żuberek, R.
Szymczak, H.
Gonzalez, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013177.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.80.+q
68.90.+g
78.66.Jg
Opis:
The magnetic anisotropy and magnetostriction in nanocrystalline grains in non-magnetic or magnetic matrix (nanoparticles or nanocrystalline materials) differ from their bulk properties. The interactions between atoms at the interface play the important role in these magnetic properties. In this paper the magnetic dipolar contribution to magnetostriction energy has been calculated for spherical crystal grains (of bcc and fcc symmetry) with interface layer of atoms possessing different magnetic moment. Total magnetoelastic energy of the sphere-interface system is a sum of magnetoelastic energy of the sphere, energy of the interactions between the sphere and the interface and also the energy of the interface. It was shown that magnetoelastic energy depends on the sphere size and interface thickness.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 531-534
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joule Heating Preannealing Effect in the Coercivity Field and Magnetostriction Constant of Co$\text{}_{66}$Fe$\text{}_{4}$Mo$\text{}_{2}$Si$\text{}_{16}$B$\text{}_{12}$ Alloy
Autorzy:
Garcia Tello, P.
González, J.
Blanco, J.
Żuberek, R.
Powiązania:
https://bibliotekanauki.pl/articles/2013239.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.30.Gw
75.80.+q
Opis:
The effect of thermal treatments (by the Joule heating and conventional annealing) on the coercivity and saturation magnetostriction constant in the amorphous and nanocrystalline Co$\text{}_{66}$Fe$\text{}_{4}$Mo$\text{}_{2}$Si$\text{}_{16}$B$\text{}_{12}$ alloy is reported. It is noticeable the near insensibility to the external stress of coercive field and anisotropy field (leading to extremely low value of magnetostriction 1.5×10$\text{}^{-8}$) achieved after the Joule heating by two steps (first one to relax the internal stresses and the second one to develop a fine nanocrystalline structure).
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 595-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transmission through Graphene Bilayer Flakes
Autorzy:
Chico, L.
González, J.
Santos, H.
Pacheco, M.
Brey, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419511.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.-f
73.63.-b
Opis:
We investigate the electronic transport properties of a bilayer graphene flake contacted by two monolayer nanoribbons. This finite-size bilayer flake can be built by overlapping two semi-infinite ribbons. We study and analyze the electronic behavior of this structure by means of a tight-binding method and a continuum Dirac model. We have found that the conductance oscillates markedly between zero and the maximum value of the conductance, allowing for the design of electromechanical switches.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 299-303
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protection From Steam at High Pressures: Development of a Test Device and Protocol
Autorzy:
Sati, R.
Crown, E. M.
Ackerman, M.
Gonzalez, J.
Dale, D.
Powiązania:
https://bibliotekanauki.pl/articles/90402.pdf
Data publikacji:
2008
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
steam protection
high pressure steam
protective materials
Opis:
Extensive use of pressurized steam in the oil and gas sectors has led to incidents where workers were seriously injured. In this study a test device and procedure to measure heat transfer through fabrics during steam exposure were developed and evaluated. Several factors were considered while designing the test device to simulate work site conditions. Fabrics were exposed to steam at 2 distances (50 and 100 mm) and 2 pressures (207 and 69 kPa). Theoretical considerations included heat and mass transfer, and fabric structure and performance properties. The test device and procedure differentiated well among both fabric and exposure conditions. For all fabrics, maximum heat transfer was observed at highest steam pressure and shortest distance. Laminated and coated fabrics performed better than a fabric without such treatments.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2008, 14, 1; 29-41
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current Annealings and Magnetoimpedance in Co-Fe Amorphous Ribbons
Autorzy:
González, J.
Domínguez, L.
Blanco, J. M.
Aragoneses, P.
Valenzuela, R.
Powiązania:
https://bibliotekanauki.pl/articles/1956111.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Nt
75.50.Kj
Opis:
Amorphous ribbons of composition (Co$\text{}_{0.95}$Fe$\text{}_{0.05}$)$\text{}_{100-x}$Si$\text{}_{0.4x}$ B$\text{}_{0.6x}$, with x=25 and 30 were prepared by the melt-spinning technique. Current annealings at 600 mA were performed for annealing times between 15 s and 60 min. The magnetoimpedance response was investigated by submitting the ribbons to ac currents at frequencies in the 10-200 kHz range, with amplitudes between 1 and 15 mA (rms), and measuring their voltage response. The observed results show that a transverse anisotropy is induced by the thermal treatments, which can be evaluated by means of the magnetoimpedance effect. Due to its lower Curie temperature, the x=30 ribbons exhibited lower sensibility to the current annealings.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 451-454
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Invariants and flow geometry
Autorzy:
González-Dávila, J.
Vanhecke, L.
Powiązania:
https://bibliotekanauki.pl/articles/965888.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
flow model spaces
normal, contact and curvature homogeneous flows
invariants and characterizations of special Riemannian manifolds
flows generated by a unit Killing vector field
Opis:
We continue the study of Riemannian manifolds (M,g) equipped with an isometric flow $ℱ_ξ$ generated by a unit Killing vector field ξ. We derive some new results for normal and contact flows and use invariants with respect to the group of ξ-preserving isometries to charaterize special (M,g,$ℱ_ξ$), in particular Einstein, η-Einstein, η-parallel and locally Killing-transversally symmetric spaces. Furthermore, we introduce curvature homogeneous flows and flow model spaces and derive an algebraic characterization of Killing-transversally symmetric spaces by using the curvature tensor of special flow model spaces. All these results extend the corresponding theory in Sasakian geometry to flow geometry.
Źródło:
Colloquium Mathematicum; 1999, 81, 1; 33-50
0010-1354
Pojawia się w:
Colloquium Mathematicum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control in loan transactions: adjusting the payments to the real inflation rates
Autorzy:
Cruz Rambaud, S.
González Sánchez, J.
Powiązania:
https://bibliotekanauki.pl/articles/205670.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
adjustment
loan
payment
inflation
interest rate
Opis:
This paper explores the effect of inflation on general financial transactions and particularly on loans. For this purpose, inflation is specified in the mathematical expression of a capitalization or discounting function. Thus, we write these functions as the product of an inflation-free capitalization or discounting function and the law of variation of the money purchasing power. As an immediate consequence, we show that the instantaneous rate of a capitalization or discounting function is the sum of the instantaneous rates of each component. Later, this decomposition is applied to simple and compound financial transactions, leading to the equivalence among deflated amounts by means of an inflation-free capitalization or discounting function. This analysis is applied to a loan transaction where we introduce six methods to adjust the payments to the real inflation, because, in a beginning, these payments were calculated with the predicted inflation rates.
Źródło:
Control and Cybernetics; 2013, 42, 4; 829-853
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Engineering of Magnetic Properties of Magnetic Microwires
Autorzy:
Zhukov, A.
Ipatov, M.
Blanco, J.
Corte-León, P.
Olivera, J.
Gonzalez, J.
Zhukova, V.
Powiązania:
https://bibliotekanauki.pl/articles/1029739.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ej
75.60.Jk
Opis:
We present an overview of the factors affecting soft magnetic properties, fast domain wall propagation and giant magnetoimpedance (GMI) effect in thin amorphous wires. The magnetoelastic anisotropy is one of the most important parameters that determine the magnetic properties of glass-coated microwires and therefore annealing can be very effective for manipulation the magnetic properties of amorphous ferromagnetic glass-coated microwires. Increasing of DW velocity in Fe-rich and Fe-Ni based (low Ni content) microwires is achieved after annealing. After heat treatment of Co-rich microwires we can observe transformation of inclined hysteresis loops to rectangular and coexistence of fast magnetization switching and GMI effect in the same sample. On the other hand stress annealing of Fe- and Co-rich microwires allows achievement of considerable magnetic softening and GMI effect enhancement.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 321-328
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Viscosity and creep compliance of polyoxymethylene copolymers of various average molecular weights
Lepkość i podatność na pełzanie kopolimerów polioksymetylenowych o różnych średnich ciężarach cząsteczkowych
Autorzy:
Gonzalez-Gutierrez, J.
Oblak, P.
Megen, Z. M.
Emri, I.
Powiązania:
https://bibliotekanauki.pl/articles/947533.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
polyoxymethylene
molecular weight
viscosity
creep compliance
activation energy
polioksymetylen
ciężar cząsteczkowy
lepkość
podatność na pełzanie
energia aktywacji
Opis:
The effect of average molecular weight (Mw ) of polyoxymethylene (POM) on melt viscosity and solid state creep compliance were investigated. Viscosity follows the power function of Mw. Creep compliance results indicate that time-temperature superposition applies to POM copolymers. Creep compliance in ashort time (0.25 s) is independent of Mw, but in a longer time (10 years) it follows an inverse power law relation with Mw, up to a critical value of Mw = 81 100, where creep compliance becomes independent of Mw. At intermediate time (17 min), similar to short one, no effect on susceptibility to creep compliance was observed. It was also stated that the activation energy is independent of Mw.
Zbadano wpływ średniego ciężaru cząsteczkowego (Mw) wybranych kopolimerów polioksymetylenowych (POM) na lepkość stopu i podatność na pełzanie próbki w stanie stałym. Stwierdzono, że w przypadku wszystkich badanych kopolimerów POM zależność lepkości od Mw opisuje funkcja potęgowa. Wyniki badań podatności na pełzanie wykazały zgodność z zasadą równoważności temperaturowo-czasowej. Podatność na pełzanie w krótkim czasie (0,25 s) była niezależna od Mw, natomiast w czasie dłuższym (10 lat) wielkość ta zmniejszała się ze zwiększaniem Mw, aż do wartości krytycznej Mc = 81 100, po której nie zależała już od Mw. W średnim czasie (17 min), podobnie jak w czasie krótkim, Mw nie wpływał na podatność na pełzanie. Zaobserwowano również, że energia aktywacji nie jest funkcją Mw.
Źródło:
Polimery; 2015, 60, 10; 620-627
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improving the intensification and diversification balance of the tabu solution for the Robust Capacitated International Sourcing problem (RoCIS)
Autorzy:
Huacuja, H. J. F.
González-Velarde, J. R.
Valdez, G. C.
Powiązania:
https://bibliotekanauki.pl/articles/385145.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
RoCis
heuristic approach
optimization
initial solution
tabu search
memory strategies
Opis:
This paper addresses the robust capacitated international sourcing problem (RoCIS), which consists of selecting a subset of suppliers with finite capacity, from an available set of potential suppliers internationally located. This problem was introduced by González-Velarde and Laguna in [1], where they propose a deterministic solution method based on tabu search memory strategies. The pro cess consists of three steps: build an initial solution, create a neighborhood of promising solutions and perform a local search in the neighborhood. In this work we propose improving the construction of the initial solution, the cons truction of the neighborhood, the local search, and the intensification and diversification balance. Experimental evidence shows that the improved tabu solution with diver sification outperforms the best solutions reported for six of the instances considered, increases by 18% the number of best solutions found and reduces by 44% the deviation of the best solution found, respect to the best algorithm reported.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2010, 4, 4; 64-73
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Approximate mechanical behavior analysis of a thick-wall metallic liner reinforced with composites, submitted to internal pressure
Autorzy:
Vargas-Rojas, E.
Palacios-Montúfar, C.
Hernández-Moreno, H.
González-Velázquez, J. L.
Powiązania:
https://bibliotekanauki.pl/articles/200013.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mechanical behavior analysis
thick-wall metallic liner
composites
internal pressure
analiza zachowania
ściana
kompozyty
ciśnienie wewnętrzne
Opis:
This study aims to simulate and to analyze the elastic and the damage behavior of a reinforced metallic liner (RML) by means of a computational tool, in order to aid in the design of high specific-stiffness and -strength barrels for heavy-duty hydraulic applications. Case studies for the program validation are undertaken using an AISI 1026 or St52.3 steel tubing reinforced with a polymeric composite of glass fiber and epoxy resin, wound in a hoop pattern. The mechanical behavior of the RML under internal pressure with no-end effects is predicted by means of strain measurements at the outermost layer. The mathematical model is based on the Classical Lamination Theory (CLT) improved with kinematic relationships that allow to introduce curvature effects. Numerical results based on experimental measurements show that the reinforcement is effective, allowing to considerably augment the maximum bearable pressure with respect to a non-reinforced metallic liner (nRML), without important weight or cost increase.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 219-233
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Size optimization of rectangular cross-section members subject to fatigue constraints
Autorzy:
González Mendoza, J. M.
Alcántara Montes, S.
Silva Lomelí, J. J.
Flores Campos, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/949129.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
size optimization
multiaxial fatigue
non-proportional
Opis:
Although in the scientific literature there are studies regarding optimization of structural members subject to static loads or even cyclic in-phase loads, the optimization of structures subject to cyclic, out-of-phase multiaxial loads is still an unexplored issue. In this paper, we present an approach to the problem of size optimization of rectangular cross-section members subject to multiaxial in-phase and out-of-phase cyclic loads. The objective of the optimization is to minimize the cross sectional area of such elements while retaining their fatigue endurance. Under the proposed methodology, optimum values of the area are achieved for six loading cases and for three values of the height to width ratio of the cross section, and these values are reported. The novelty of the approach lies in the inclusion of two multiaxial high cycle fatigue criteria, i.e., Dang Van and Vu-Halm-Nadot ones, as constraints for size optimization problems, fully integrated within an in-house developed tool, capable of handling non-proportional stresses. A plot of the feasible solution space for this optimization problem is also obtained.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 547-557
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of sub-channel based Málaga atmospheric optical links with real β parameter
Autorzy:
López-González, F. J.
Jurado-Navas, A.
Garrido-Balsells, J. M.
Castillo-Vázquez, M.
Puerta-Notario, A.
Powiązania:
https://bibliotekanauki.pl/articles/174807.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Malaga distribution
generalized-K distribution
atmospheric optical communications
atmospheric propagation
atmospheric turbulence
scintillation
Opis:
A generalization of the Málaga atmospheric optical communications links treated as a finite number of generalized-K distributed sub-channels is analyzed in terms of outage probability and outage rate when its β parameter belongs to the set of real numbers. To the best of the author’s knowledge, this is the first time that β ∈ ℜ is considered. The new analytical expressions derived in this paper lead to a new physical and more realistic interpretation of atmospheric optical links, especially in terms of performance.
Źródło:
Optica Applicata; 2017, 47, 4; 545-556
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationships between eye fluids and blood values after exercise in lidia cattle: mineral parameters
Autorzy:
González-Montaña, J.R.
Escalera-Valente, F.
Lomillos, J.M.
Alonso, A.J.
Gaudioso, V.
Alonso, M.E.
Powiązania:
https://bibliotekanauki.pl/articles/2087493.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aqueous humour
vitreous humour
minerals parameters
intraocular fluids
blood
metabolism
Lidia cattle
Źródło:
Polish Journal of Veterinary Sciences; 2019, 3; 445-455
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 66

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