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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:
Diálogos metaficcionales e intermediales (II) entre Agustín Fernández Mallo y Enrique Vila-Matas
Metafictional and Intermedial (II) Dialogues Between Agustín Fernández Mallo and Enrique Vila-Matas
Autorzy:
Gil González, Antonio J.
Powiązania:
https://bibliotekanauki.pl/articles/1051209.pdf
Data publikacji:
2013-01-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
Metafiction
intermediality
Darío Villanueva
Umberto Eco
Agustín Fernández Mallo
Enrique Vila-Matas
Nocilla Lab
Opis:
The essay, dedicated to Darío Villanueva, one of the most important Spanish specialists in literary theory and comparative literature of the 20th century, explores in the first part his contribution to the research on metaliterature and metafiction in the Spanish contemporary novel of the decades of 1980-1990. His works establish the relationships of these concepts with postmodernity theories and with umberto Eco’s thesis in Il nome della rosa, Postille and other relevant essays of the Italian author. In the second part of the text, the aim is to apply these concepts of literary self-consciousness and reflexivity in the novel as a story-telling device in the work of one of the most relevant Spanish young writers of the 21st Century, Agustín Fernandez Mallo’s Nocilla Lab. In this sense, we will focus the ending sequence, written (and designed) in form of a comic book or graphic novel, in which the young author puts himself beside the more recognized Enrique Vila-Matas, as an allegoric and fictional reflection of Pierre Bourdieu’s theories about the literary field.
Źródło:
Studia Romanica Posnaniensia; 2013, 40, 2; 39-49
0137-2475
2084-4158
Pojawia się w:
Studia Romanica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wspólnoty tzeltal-tzotziles a kształtowanie przestrzeni regionalnych w Meksyku
Tzeltal-Tzotzil communities and the formation of regional spaces in Mexico
Autorzy:
Gonzalez Martinez, J.R.
Powiązania:
https://bibliotekanauki.pl/articles/2085432.pdf
Data publikacji:
1994
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Opis:
The article presents some aspects of the culture Tzeltal-Tzotzil of the Chiapas Highlands and the way it manifests itself in the conformation and use of the regional space. One of its more visible features is the toltec principle of duality, according to which the dual deity manifests its presence in all the objects, natural phenomena, in the mesoamerican nations' concepts of the world and of life. The catholic believes brought by missionaries were integrated into the logic of the principle of duality, in the way that the old Mayan believs system adopted some elements of Spanish culture, analyzing them according to its own vision of the world, fulfilling the requirements imposed by the colonial govemment. From that moment on, the Indian culture analyzed here undergoes the constant process of adaptation in which all the elements coming from non-Indian society (sociedad ladina) are being integrated or interpreted according to the dual logic giving as a result the cultural complex transposed in the conformation of the society and space. It also works as an element of the strategy of social reproduction - and because of tha t, the vision of the society and the culture of the Tzeltal-Tzotzil maintains its vitality in the conditions of the changing social development process.
Źródło:
Prace i Studia Geograficzne; 1994, 15; 103-118
0208-4589
Pojawia się w:
Prace i Studia Geograficzne
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
Tytuł:
Numerical and Physical Parametric Analysis of a SEN with Flow Conditioners in Slab Continuous Casting Mold
Autorzy:
Gonzalez-Trejo, J.
Real-Ramirez, C. A.
Miranda-Tello, R.
Rivera-Perez, F.
Cervantes-de-la-Torre, F.
Powiązania:
https://bibliotekanauki.pl/articles/351515.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
submerged entry nozzle
fluid-flow modifiers
continuous casting of steel
mold flow patterns
turbulence
Opis:
Some of the most recent technologies that improves the performance in continuous casting process has installed infrastructure outside the mold to modify the natural fluid flow pattern to obtain a quasi-steady condition and promote a uniform solidified shell of steel. The submerged entry nozzle distributes the liquid steel in the mold and can be used to obtain the flow symmetry condition with external geometry improvements. The fluid flow conditioners were located near the outlet ports of the nozzle. The aim of the modifiers is to impose a pseudo symmetric pattern in the upper zone of the mold by inhibiting the fluid exchange between the zones created by conditioners. This work evaluates the effect of the thickness and length of the fluid-flow modifiers on the overall performance of the submerged nozzle. These properties of the fluid-flow modifiers were normalized based on two of the geometric dimensions of the standard equipment. Numerical and physical simulations suggest that the flow modifier should be as thin as possible.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2A; 927-946
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A convolution operation for a distributional Hankel transformation
Autorzy:
J. Betancor, J.
González, B.
Powiązania:
https://bibliotekanauki.pl/articles/1288540.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Hankel transformation
convolution
distributions
Bessel functions
Opis:
We investigate the Hankel transformation and the Hankel convolution on new spaces of generalized functions.
Źródło:
Studia Mathematica; 1995-1996, 117, 1; 57-72
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on bounded harmonic functions over homogeneous trees
Autorzy:
Gonzalez-Vieli, F. J.
Powiązania:
https://bibliotekanauki.pl/articles/254752.pdf
Data publikacji:
2013
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
bounded harmonic function
homogenous tree
Opis:
Let Τk be the homogeneous tree of degree k ≥ 3. J. M. Cohen and F. Colonna have proved that if ƒ is a bounded harmonic function on Τk, then [formula]for any adjacent vertices x and y in Τk. We give here a new and very simple proof of this inequality.
Źródło:
Opuscula Mathematica; 2013, 33, 4; 697-700
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Online Robotic Labs In Software Engineering Courses
Zdalne laboratoria robotyki w zajęciach inżynierii oprogramowania
Autorzy:
Gonzalez, F.
Zalewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/266592.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
online labs
robotics labs
STEM curriculum
software engineering education
laboratorium robotów
inżynieria oprogramowania
robotyka
Opis:
Florida Gulf Coast University, College of Engineering has developed over recent years a sophisticated undergraduate software engineering lab for use in embedded systems and related team project courses. A number of teaching modules have been developed, with emphasis on security, complex systems, and webbased access. The objective of the current project is to focus on developing a lab specific to robotics applications, with online access, which can be used across the undergraduate curricula, especially in software engineering courses. Creating an Online Robotics Lab takes advantage of the existing equipment, software and curricular modules to expand them for broader use, and help develop a more advanced full-scale operation across the curriculum. Developing such a lab will have an impact on advancing teaching in disciplines such as Sciences, Technology, Engineering and Math (STEM).
W ciągu ostatnich kilku lat, na Wydziale Inżynierii Florida Gulf Coast University, powstało bardzo złożone laboratorium inżynierii oprogramowania przenaczone do zajęć z systemów wbudowanych i innych kursów uwzględniających projekty zespołowe. Opracowane zostały odpowiednie moduły nauczania, na tematy związane z bezpieczeństwem, systemami złożonymi, i dostępem przez Internet. Celem obecnego projektu jest utworzenie laboratorium specyficznego dla potrzeb robotyki, z dostępem przez Internet, które moża wykorzystywać w innych dziedzinach, a wszczególności w inżynierii oprogramowania. Proces tworzenia laboratorium opiera się na istniejących urządzeniach, oprogramowaniu i modułach nauczania, z roszerzeniem ich w kierunku zastosowania w kursach z innych dziedzin, poza inżynierią. Laboratorium takie będzie miało wpływ na postęp w nauczaniu w takich dyscyplinach, jak nauki ścisłe, technologia, inżynieria i matematyka. W artykule opisano proces tworzenia i użycia modułów z wykorzystaniem ośmiu urządzeńrobotów, począwszy od prostych robotów Lego, do skomplikowanych pojazdów sterowanych zdalnie przez Internet.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2014, 37; 15-18
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ICT in higher education: an experience with e-books
Autorzy:
Gonzalez, R.
Gasco, J
Llopis, J
Powiązania:
https://bibliotekanauki.pl/articles/117711.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Promocji Wiedzy
Tematy:
educational Innovation
ICTs
e-book
Innovation implementation
Opis:
The present paper seeks to explain the diverse advantages of virtual books and also the main barriers that make it difficult their implementation in the classroom. A brief review of the literature on ICT, e-learning, distance education and e-books will be complemented with a case study about the preparation, development and implementation of an e-book. The paper could be helpful both for systems analysts and for teachers when they are developing and implementing e-books.
Źródło:
Applied Computer Science; 2014, 10, 1; 5-18
1895-3735
Pojawia się w:
Applied Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The iron and steel industry: a global market perspective
Przemysł żelaza i stali: analiza stanu obecnego z perspektywy rynku światowego
Autorzy:
González, I. H.
Kamiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/216538.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
przemysł żelaza
przemysł stali
rynek międzynarodowy
surowce mineralne
konsolidacja
siła rynkowa
iron industry
steel industry
international market
raw materials
consolidation
market power
Opis:
The paper presents a global perspective of the current technologies used for steel production and the steel markets. The iron and steel industry is a very complex sector that is strongly related with the rest of the economy due to the importance of steel products for industries such as construction, automotive, and other manufacturing sectors. Moreover, the iron and steel industry demands significant amounts of raw materials and energy, and most companies producing raw materials are located remote from the areas of highest steel demand. In consequence, both steel products and inputs are traded internationally (mostly by sea) and in large quantities, what additionally complicates analyses of the iron and steel industry. Steel prices depend on several variables, and there is not a single price for steel since there is a great variety of steel products traded. Those prices depend on supply and demand interaction (between steel producers and consumers, but also on interaction with other industries competing for the same inputs), and on transport conditions. As concerns the ownership structure, the steel industry consists of some large firms that operate globally and produce significant output, and many small firms that operate at a lesser scale. Recently, some of those firms have consolidated into large multinationals (such as ArcelorMittal, formed in 2006 by the merger of Arcelor and Mittal Steel, Arcelor being the result of the previous merger of Aceralia (ES), Usinor (FR), and Arbed (LX) in 2002). The results of this article form the basis for further long- and mid-term analyses of the development of the global steel industry. The main conclusion of the paper is that any future analysis of the iron and steel industry should be based on quantitative modelling tools that: (i) properly capture the technological diversity of the industry and the key features of the supply chain, (ii) are able to consider the strategic behaviour of all the key players of the industry, and (iii) consider all those factors at the global scale.
W artykule przedstawiono stan obecny rozwoju technologii wykorzystywanych w hutnictwie żelaza i stali z punktu widzenia rynku światowego. Sektor produkcji żelaza i stali charakteryzuje się bardzo skomplikowanymi zależnościami, ze względu na silne powiązanie z resztą gospodarki oraz znaczenie wyrobów stalowych dla innych sektorów przemysłowych, takich jak na przykład budownictwo, motoryzacja itp. Ponadto, hutnictwo żelaza i stali wymaga znacznych ilości surowców mineralnych i energii, a większość firm produkujących surowce mineralne jest zlokalizowanych z dala od obszarów o najwyższym popycie na stal. W konsekwencji, zarówno wyroby stalowe jak i surowce mineralne są przedmiotem handlu międzynarodowego (głównie drogą morską), co dodatkowo utrudnia prowadzenie analiz dotyczących sektora hutnictwa żelaza i stali. Ceny stali, a w zasadzie poszczególnych wyrobów stalowych, które są przedmiotem obrotu, zależą od wielu czynników. Do najważniejszych z nich należą przede wszystkim zgłaszany przez konsumentów popyt, zdolności produkcyjne oraz aktualna sytuacja w międzynarodowym transporcie. Jeśli chodzi o strukturę własności, w przemyśle stalowym funkcjonuje kilka dużych firm, które mają swoje huty na całym świecie (często zakupione w procesie prywatyzacji lub w wyniku fuzji z innymi przedsiębiorstwami) oraz wiele małych firm, które działają na znacznie mniejszą skalę. W ostatnim czasie niektóre firmy przeszły proces konsolidacji i fuzji w wyniku czego powstały koncerny międzynarodowe (takie jak ArcelorMittal, który powstał w 2006 roku w wyniku fuzji Arcelora i Mittal Steel; Arcelor powstał z kolei w wyniku połączenia Aceralia (Hiszpania), Usinor (Francja) i Arbed (Luksemburg) w 2002 r.). Wyniki analizy zaprezentowanej w niniejszym artykule stanowią podstawę do dalszych badań w zakresie długo- i średniookresowych perspektyw rozwoju światowego przemysłu stalowego. Analizy w zakresie rozwoju przemysłu żelaza i stali powinny być oparte na narzędziach ilościowych (modele matematyczne) które umożliwiają: (i) właściwe uchwycenie różnorodności technologicznej przemysłu i głównych cech łańcucha dostaw surowców mineralnych i energii, (ii) odzwierciedlenie różnych strategii przyjmowanych przez poszczególnych kluczowych graczy w branży oraz (iii) wzięcie pod uwagę wszystkich wspomnianych czynników na poziomie rynku międzynarodowego.
Źródło:
Gospodarka Surowcami Mineralnymi; 2011, 27, 3; 5-28
0860-0953
Pojawia się w:
Gospodarka Surowcami Mineralnymi
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quantum Monte Carlo vs. Density Functional Methods for the Prediction of Relative Energies of Small Si-C Clusters
Autorzy:
Gonzalez Szwacki, N.
Majewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1492983.pdf
Data publikacji:
2011-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
31.15.E-
36.40.-c
Opis:
In the present paper, we assess the accuracy of popular and widely used approaches based on density functional theory by relating them to the most accurate at present quantum Monte Carlo calculations. As the test case, we consider the relative stability of small $Si_{n}C_{m}$ isomers. We find out that none of the studied DFT approaches employing local, semilocal, or even hybrid functionals are able to predict correctly the relative stability of the isomers.
Źródło:
Acta Physica Polonica A; 2011, 120, 5; 964-966
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Normalization of Multifocal Acoustic Radiation Force Impulse Images
Autorzy:
González-Salido, N.
Camacho, J.
Powiązania:
https://bibliotekanauki.pl/articles/176800.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
elastography
radiation force
ARFI
multifocal ARFI
Opis:
Imaging the tissue displacements caused by Acoustic Radiation Force Impulse (ARFI) provides qualitative tissue elasticity maps around the focus. To increase imaging range, multi-focus techniques combine several images obtained with different focal depths. Since the acoustic radiation force depends on focus depth, axial distance and steering angle, a normalization process is required before blending multi-focal ARFI images so that changes in the displayed displacements represent true tissue elasticity variations. This work analyzes the sources of displacement variability in multi-focal-zone ARFI and proposes a procedure to normalize and combine partial images. The proposal is based on the system focal configuration, transducer characteristics and global tissue parameters found by ultrasonic measurements. Performance of the proposed algorithm is experimentally evaluated with tissue mimicking phantoms.
Źródło:
Archives of Acoustics; 2017, 42, 2; 321-331
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Submillimeter-Wave Oscillations in Recessed InGaAs/InAlAs Heterostructures: Origin and Tunability
Autorzy:
Pérez, S.
Mateos, J.
González, T.
Powiązania:
https://bibliotekanauki.pl/articles/1505462.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.Fg
07.57.Hm
73.40.Kp
Opis:
By means of an ensemble Monte Carlo simulator, the appeareance of THz oscillations in InAlAs/InGaAs slot diodes is predicted when the applied bias exceeds the threshold for intervalley transfer. Such high frequency is attained by the presence of a Gunn-like effect in the recess-to-drain region of the device channel whose dynamics is controlled by ballistic Γp valley electrons. In this work we explain the mechanism at the origin of this effect and also the influence of the bias conditions, δ-doping, recess-to-drain distance and recess length on the frequency of the ultrafast Gunn-like oscillations. The simulations show that a minimum value for the δ-doping is necessary to have enough carrier concentration under the recess and allow the oscillations to emerge. Finally, we show that shortening the devices (small recess and recess-to-drain lengths) increases the oscillation frequency, so provides an interesting frequency tunability of this THz source.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 111-113
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Energetics of Fragments of the Planar α and β Boron Sheets
Autorzy:
Gonzalez Szwacki, N.
Tarkowski, T.
Majewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1398547.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.46.-w
68.65.-k
73.22.-f
Opis:
Large scale first principles calculations based on density functional theory and using hybrid exchange-correlation functionals have been performed in order to study the structural properties and the relative stability of fragments of the planar α and β boron sheets. Based on the considered structures, we show that, in contrast to the fragments of the α -sheet, all the fragments of the β -sheet, having more than ≈30 atoms, are fully planar regardless of their shape. We conclude that the β -sheet is the only planar boron sheet reported so far that retains planarity even if it is reduced to relatively small fragments.
Źródło:
Acta Physica Polonica A; 2016, 129, 1a; A-148-A-149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green economic development as the framework for green finance and green investment
Zielony rozwój gospodarczy jako koncepcja wyznaczająca ramy zielonego finansowania i zielonych inwestycji
Autorzy:
Vargas-Hernandez, J.
Rakowska, J.
Vargas-Gonzalez, O.C.
Powiązania:
https://bibliotekanauki.pl/articles/2148657.pdf
Data publikacji:
2022
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
green economic development
green finance
green investments
Opis:
Subject and purpose of work: This study aims to analyse the main elements of the green economic development as a framework for green finance and green investment. The analysis spurs from the underlying notion that green economics is inherently a normative framework and a school of thought development of the neo-classical economic thinking with conceptual assumptions, deficiencies, and contradictions, beginning to set out the roots, aims and philosophical principles. Materials and methods: The methods used are the analytical and descriptive ones based on the critical literature review and an experiential reflective attitude on the key issues concerning the variables of green economic development, green finance, and green investment. Conclusions: It is concluded that the implementation of green economy activities have many obstacles to face. The inadequate funding and the institutional support in collaborations and coordination practices are the most crucial.
Źródło:
Economic and Regional Studies; 2022, 15, 3; 303-321
2083-3725
2451-182X
Pojawia się w:
Economic and Regional Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo Analysis of the Dynamic Behavior οf InAlAs/InGaAs Velocity Modulation Transistors: A Geometrical Optimization
Autorzy:
Vasallo, B.
González, T.
Pardo, D.
Mateos, J.
Powiązania:
https://bibliotekanauki.pl/articles/1505612.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.De
85.30.Tv
Opis:
The influence of the geometry on the dynamic behavior of InAlAs/InGaAs velocity modulation transistors is analyzed by means of a Monte Carlo simulator in order to optimize the performance of this new type of transistor. In velocity modulation transistors, based on the topology of a double-gate high electron mobility transistor, the source and drain electrodes are connected by two channels with different mobilities, and electrons are transferred between both of them by changing the gate voltages in differential mode. Consequently, the drain current is modulated while keeping the total carrier density constant, thus in principle avoiding capacitance charging/discharging delays. However, the low values taken by the transconductance, as well as the high capacitance between the two gates in differential-mode operation, lead to a deficient dynamic performance. This behavior can be geometrically optimized by increasing the mobility difference between the two channels, by increasing the channel width and, mainly, by reducing the gate length, with a higher immunity to short channel effects than the traditional architectures.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 193-195
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Advantages of application of the backscattered electron scanning images in the determination of soil structure and soil constituents
Autorzy:
Wierzchos, J.
Garcia-Gonzalez, M.T.
Ascaso, C.
Powiązania:
https://bibliotekanauki.pl/articles/25149.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil structure
backscattered electron scanning image
soil constituent
microanalytical technique
soil component
Źródło:
International Agrophysics; 1995, 09, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Senior lab projects for teaching the Internet of Things in a Software Engineering program
Laboratoria dla „Internetu rzeczy” w programie Inżynierii Oprogramowania
Autorzy:
Gonzalez, F.
Guo, D.
Nowicki, A.
Zalewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/268134.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
internet of things (IoT)
cloud computing
engineering education
software engineering education
online labs
Internet rzeczy
przetwarzanie w chmurze
kształcenie inżynierów
inżynieria oprogramowania
zdalne laboratorium
Opis:
This paper addresses student labolatories for courses related to the Internet of Things (IoT) in an undergraduate Software Engineering program. It revews the concept of the IoT, first, then discusses benefits of IoT in education, especially in engineering, and finally presents examples of projects, reviewing some more fundamental concepts of introducing such labs. Specific examples of IoT projects include software development for: a robotic arm accessed through AWS, GPS tracker with Sparkfun data stream services, online health monitoring with a smartwatch and Google Cluod, and remote relay access from a phone with MQTT service.
W artykule omówiono zagadnienia laboratoriów studenckich dla kursów związanych z „Internetem rzeczy”, w programie studiów Inżynierii Oprogramowania. Przedstawiono koncepcję Internetu rzeczy i omówiono korzyści płynące z użycia tej technologii w kształceniu, szczególnie w dyscyplinach inżynierskich, dyskutując podstawowe problemy z tym związane. W szczególności, opisano praktyczne rozwiązania problemów laboratoryjnych, z użyciem robota, systemu GPS, inteligentnego zegarka i zdalnego przekaźnika, oraz przekazywania odpowiednich danych do przetwarzanuia w chmurze.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2017, 52; 31-36
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The implications of managerial and leadership styles, and organizational innovation on organizational citizenship behavior
Implikacje zmiennych zarządczych i przywódczych oraz innowacji organizacyjnych dla zachowań obywatelskich w orgnizacji
Autorzy:
Vargas-Hernández, J.G.
Vargas-González, O.C.
Powiązania:
https://bibliotekanauki.pl/articles/31342203.pdf
Data publikacji:
2022
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
leadership style
organization management
organizational citizenship behaviour
citizenship
behaviour
motivation
Źródło:
Acta Scientiarum Polonorum. Oeconomia; 2022, 21, 1; 5-13
1644-0757
Pojawia się w:
Acta Scientiarum Polonorum. Oeconomia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of road signs using radiometric and geometric data from terrestrial LiDAR
Autorzy:
Gonzalez-Jorge, H
Riveiro, B.
Armesto, J.
Arias, P.
Powiązania:
https://bibliotekanauki.pl/articles/173526.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
road inspection
laser scanning
radiance
road sign
Opis:
Maintenance works are crucial to reduce the risk of accidents. Road signs appear to be one of the most important elements for safety purposes so their inspection is commonly included in the most extended road management systems. The geometric state of the sign is of great importance, especially interesting is its flatness and the inclination relative to the ground. Road signs are printed with reflective paints to maximize the visibility to the drivers. This coating produces a high reflected radiation that is easily recorded by the photoelectric detector of the laser scanner mechanisms. It allows establishing an intensity based filter in order to perform the 3D classification of the road sign. In this work, a number of road signs are evaluated, under a geometric point of view, using the laser scanner Riegl LMS Z390i. A Matlab algorithm is developed for all the data processing (3D classification and evaluation of geometric parameters). Results do not show the evidence of folded or abnormally tilted signs. The developed algorithms open the possibility of using the attribute of intensity of laser scanning data for classification purposes, during the automatic evaluation of the condition state of road signs. Such algorithms could increase the productivity and reliability of the inspection works.
Źródło:
Optica Applicata; 2013, 43, 3; 421-433
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gathering an edible wild plant: food or medicine? A case study on wild edibles and functional foods in Granada, Spain
Autorzy:
Benítez, G.
Molero-Mesa, J.
Reyes González-Tejero, M.
Powiązania:
https://bibliotekanauki.pl/articles/57844.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
A study on wild edible resources has been performed in the western part of Granada Province (Spain) using ethnobotanical methods. We document and analyze knowledge concerning wild edible plants and mushrooms and their folk medicinal uses in the study area. Several botanical features and use characteristics have been analyzed for the species included, with special attention to their medicinal uses, highlighting a large number of edible-medicinal species. Local importance of the medicinal uses for these resources has been confirmed. Up to 135 species are gathered from the wild in the study area, from which 46 can be considered folk functional foods. In addition, 45 crop plants with uncommon edible or medicinal uses are included, 29 of these being considered functional foods as well. Therefore, a total of 75 plant species are used as edible medicines which serve to treat 36 different conditions. The local concept of food and medicine regarding wild plant resources seems not to be well established. Studies on the pharmacological properties of these foods are needed in order to establish their real or potential benefits for the treated affections.
Źródło:
Acta Societatis Botanicorum Poloniae; 2017, 86, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EDAS (Egnos Data Access Service) differential GNSS corrections: a reliable free-of-charge alternative for precision farming in Europe
Autorzy:
Vázquez, J.
Lacarra, E.
Morán, J.
Sánchez, M. A.
González, A.
Bruzual, J.
Rioja, J.
Powiązania:
https://bibliotekanauki.pl/articles/320569.pdf
Data publikacji:
2019
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
GNSS
Galileo
EDAS
tracking
firefighting
multisensor
fusion
communication optimization
Opis:
EDAS (EGNOS Data Access Service) is the EGNOS internet broadcast service, which provides free of charge access to the data collected and generated by the EGNOS infrastructure. EDAS disseminates over the Internet, both in real time and via an FTP archive, the raw data of the GPS, GLONASS (no commitment on GLONASS data is provided (1)) and EGNOS GEO satellites collected by the receivers located at the EGNOS reference stations, which are mainly distributed over Europe and North Africa. The EDAS services offer several types of GNSS data in various protocols and formats, such as DGNSS corrections. This paper reports on the results of some in-field tests conducted by ESSP and Topcon Agriculture to confirm the suitability of EDAS DGNSS corrections for precision farming in Europe. The European Commission (EC) is the owner of EGNOS system (including EDAS) and has delegated the exploitation of EGNOS to the European GNSS Agency (GSA). EDAS service provision is performed by ESSP, as EGNOS Services Provider, under contract with the GSA, the EGNOS program manager. In the ENC 2018 article “EDAS (EGNOS Data Access Service): Differential GPS corrections performance test with state-of-the-art precision agriculture system”, ESSP and Topcon Agriculture presented the results of the first in-field test conducted in a dynamic and real-life environment in the summer of 2017. The test results indicated that the EDAS DGNSS corrections could enable a reliable pass-to-pass accuracy performance for a wide range of precision agriculture applications and become an attractive solution for cereal farms, when the farm is located in the vicinity of an EGNOS reference station. In particular, Topcon Agriculture acknowledged that the observed performance was sufficient to support the following precision agriculture applications: spraying and spreading of any crop type, tilling and harvesting of cereal. Then, ESSP and Topcon Agriculture engaged in additional testing activities to further characterise the EDAS DGPS performance in different scenarios (i.e. at various European locations and with a variety of distances between the designated farm and the target EGNOS reference station). In each test, multiple runs with the rover tractors have been performed over the reference patterns predefined in the Topcon guidance systems. Data recorded during the tests has been analysed in detail, looking at the key performance indicators (e.g. cross track error and pass-to-pass performance) that characterize the EDAS DGPS performance for precision agriculture applications. Different techniques for the computation of the pass-to-pass accuracy performance have been used, including a procedure to measure live in the field and a post-processing alternative. The diversity of scenarios available allows drawing conclusions on the applicability of EDAS DGPS corrections (in terms of maximum distance from the target EGNOS station) for precision agriculture and also understanding the impact of operationally relevant aspects such as the quality of the mobile internet coverage (highly variable across Europe). The EDAS system and its architecture, the main types of data disseminated through EDAS services and the online information available to the EDAS users are introduced in this paper. In particular, the EDAS Ntrip service is described in detail, since it provides the differential corrections to the GPS and GLONASS satellites at the EGNOS reference stations in RTCM format, which are the basis for the present study. The article also reports on the results of the latest tests, which have been performed using Topcon receivers, vehicles and auto-steering systems. In all cases, two different Topcon guidance systems on board tractors were running simultaneously to assess the EDAS DGPS positioning performance with respect to a the reference provided by a top-performing RTK-based Topcon solution. The objective of this paper is to draw conclusions on the use of EDAS DGPS corrections as a reliable free-of-charge alternative for precision farming in Europe (especially for cereal farms), based on the available performance results from the testing campaign and the feedback from the involved precision agriculture experts.
Źródło:
Annual of Navigation; 2019, 26; 46-58
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Age on Aerobic Capacity and Health Indicators of Three Rescue Groups
Autorzy:
Prieto, J. A.
Gonzalez, V.
Del Valle, M.
Nistal, P.
Powiązania:
https://bibliotekanauki.pl/articles/90737.pdf
Data publikacji:
2013
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
physical aptitude
fitness
VO2 max
body mass index
rescue groups
siłownia
sprawność fizyczna
wskaźnik masy ciała
Opis:
The aim of this study was to determine the relationship between age, aerobic capacity (VO2 max) and other health indicators among 3 rescue groups. The type of training and the subjective perception of physical fitness obtained via the Assessment Questionnaire of Physical Fitness were also analysed. To obtain VO2 max, 37 firefighters, 22 lifeguards and 59 mine rescue workers had a treadmill test. Their body mass index and body fat percentage were also calculated. The results show a significant decline in VO2 max of the older participants, which affects the effectiveness of rescue work. Furthermore, the training of all groups was inconsistent and based on individual needs. Variable training and the decline in VO2 max with age affected the effectiveness of the rescue tasks of each group.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2013, 19, 1; 19-27
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of biological sensors appearance with ARIMA models as a tool for Integrated Pest Management protocols
Autorzy:
Fernandez-Gonzalez, M.
Ramos-Valcarcel, D.
Aira, M.J.
Rodriguez-Rajo, F.J.
Powiązania:
https://bibliotekanauki.pl/articles/50204.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2016, 23, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo Analysis of Impact Ionization in Isolated-Gate InAs/AlSb High Electron Mobility Transistors
Autorzy:
Vasallo, B.
Rodilla, H.
González, T.
Lefebvre, E.
Moschetti, G.
Grahn, J.
Mateos, J.
Powiązania:
https://bibliotekanauki.pl/articles/1506159.pdf
Data publikacji:
2011-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.De
85.30.Tv
Opis:
We perform a physical analysis of the kink effect in InAs/AlSb high electron mobility transistors by means of a semiclassical 2D ensemble Monte Carlo simulator. Due to the small bandgap of InAs, InAs/AlSb high electron mobility transistors are very susceptible to suffer from impact ionization processes, with the subsequent hole transport through the structure, both implicated in the kink effect. When the drain-to-source voltage $V_{DS}$ is high enough for the onset of impact ionization, holes generated tend to pile up at the gate-drain side of the buffer. This occurs due to the valence-band energy barrier between the buffer and the channel. Because of this accumulation of positive charge, the channel is further opened and the drain current $I_{D}$ increases, leading to the kink effect in the I-V characteristics.
Źródło:
Acta Physica Polonica A; 2011, 119, 2; 222-224
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Numerical Approach to Calculate the Radiation Efficiency of Baffled Planar Structures Using the Far Field
Autorzy:
González-Montenegro, M. A.
Jordan, R.
Lenzi, A.
Arenas, J. P.
Powiązania:
https://bibliotekanauki.pl/articles/176303.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
propagating matrix
far field
sound power
structural finite element analysis
Opis:
A numerical method is developed for estimating the acoustic power of any baffled planar structure, which is vibrating with arbitrary surface velocity profile. It is well known that this parameter may be calculated with good accuracy using near field data, in terms of an impedance matrix, which is generated by the discretization of the vibrating surface into a number of elementary radiators. Thus, the sound pressure field on the structure surface can be determined by a combination of the matrix and the volume velocity vector. Then, the sound power can be estimated through integration of the acoustic intensity over a closed surface. On the other hand, few works exist in which the calculation is done in the far field from near field data by the use of radiation matrices, possibly because the numerical integration becomes complicated and expensive due to large variations of directivity of the source. In this work a different approach is used, based in the so-called Propagating Matrix, which is useful for calculating the sound pressure of an arbitrary number of points into free space, and it can be employed to estimate the sound power by integrating over a finite number of pressure points over a hemispherical surface surrounding the vibrating structure. Through numerical analysis, the advantages/disadvantages of the current method are investigated, when compared with numerical methods based on near field data. A flexible rectangular baffled panel is considered, where the normal velocity profile is previously calculated using a commercial finite element software. However, the method can easily be extended to any arbitrary shape. Good results are obtained in the low frequency range showing high computational performance of the method. Moreover, strategies are proposed to improve the performance of the method in terms of both computational cost and speed.
Źródło:
Archives of Acoustics; 2014, 39, 2; 249-260
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Properties of MnTe, ZnTe, and ZnMnTe
Autorzy:
Gonzalez Szwacki, N.
Przeździecka, E.
Dynowska, E.
Bogusławski, P.
Kossut, J.
Powiązania:
https://bibliotekanauki.pl/articles/2038244.pdf
Data publikacji:
2004-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.50.Ah
75.50.Pp
61.10.-i
Opis:
Structural properties of ZnTe, MnTe, and Mn$\text{}_{1-x}$Zn$\text{}_{x}$Te alloy with zinc-blende, NiAs, and wurtzite phases were investigated by ab initio calculations. The calculated structural properties are in good agreement with the available experimental data. Theory predicts that the zinc-blende phase is more stable than wurtzite for all compositions. Mn$\text{}_{1-x}$Zn$\text{}_{x}$Te samples with 0.01 < x < 0.20 were grown by MBE. X-ray analysis of their crystalline structure revealed the presence of zinc-blende, wurtzite, and NiAs phases. The dominant phase changes from NiAs for the sample with x=0.01 to wurtzite for x=0.20. The observed stabilization of the wurtzite phase is possibly due to the hexagonal structure of the MnTe buffer.
Źródło:
Acta Physica Polonica A; 2004, 106, 2; 233-238
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long range measurements using a contactless low cost optical sensor
Autorzy:
Krelling, P C L
Gonzalez-Jorge, H.
Armesto, J.
Arias, P.
Powiązania:
https://bibliotekanauki.pl/articles/174034.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
laser scanning
accuracy
optical sensor
Opis:
Length measurement is very common in many industrial applications and there is a number of instrumentation involved, mainly dependent on the range and accuracy requirements. In this work, a contactless optical measurement unit is developed. It is based on a mouse sensor and an external laser source. The system is calibrated using an optical board and an electronic distance measuring system. Accuracy and precision of the system is evaluated using the reference data from a total station. Values of 1 mm and 0.3 mm are respectively obtained. Length range during the experiment is 8.5 m. The data of the optical measurement unit are compared with those obtained from a commonly used wheel encoder. Results from the optical sensor of the mouse improve the encoder data.
Źródło:
Optica Applicata; 2013, 43, 3; 435-440
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of Divalent (Ni,Sn,Zn)- Tetravalent (Ru,Sn) Ionic Mixtures of Substituted Ba Ferrite
Autorzy:
Sláma, J.
Grusková, A.
González Angeles, A.
Šoka, M.
Dosoudil, R.
Powiązania:
https://bibliotekanauki.pl/articles/1367766.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Gg
75.50.Vv
77.22.Ej
Opis:
The drop of coercivity, while preserving the saturation magnetic polarisation $J_{S}$ of substituted M-type Ba hexaferrites with composition $BaFe_{12-2x}(Me_{1}Me_{2})_{x}O_{19}$, was studied. Divalent $Me_{1}$=Ni, Zn, Sn and tetravalent $Me_{2}$=Ru, Sn ionic combinations were used in various compounds. Mössbauer spectroscopy was used to reveal sites of replacement of the $Fe^{3+}$ ions by $Ru^{4+}$ and $Sn^{4+}$. The $Ni^{2+}$, $Zn^{2+}$ and $Sn^{2+}$ occupation sites were identified as well. Strong drop of coercivity difference Δ $H_{c}(x)$ near x=0.1 and slight decrease of Δ $H_{c}(x)$ close to x=0.3 was obtained for suitable coupling of $Me_{1}^{2+}$ and $Me_{2}^{4+}$ ions.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 172-173
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic Properties of Substituted Barium Hexaferrites
Autorzy:
Sláma, J.
Grusková, A.
Jančárik, V.
Štofka, M.
González-Angeles, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813950.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
75.50.Vv
81.20.Ev
81.20.Ka
Opis:
Substituted M-type ferrite $BaFe_{12-2x}(Me_1Me_2)_xO_{19}$, 0≤x≤0.6 was prepared by both mechanical alloying and precursor method, where $Me_1$ = Co, Ni, Zn, Sn and $Me_2$ =Ru, Ti, Zr, Sn. Magnetic phase purity, change of saturation polarization, Curie temperature, coercivity and magnetic susceptibility was studied as function of x. Attention was focused to results obtained for $(NiRu)_x,$ $(ZnRu)_x,$ and $(SnRu)_x$ mixtures with low doping ratio x.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 609-612
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Three-dimensional cfd analysis to study the thrust and efficiency of a biologicallyinspired marine propulsor
Autorzy:
Lamas, M. I.
Rodríguez, J. D.
Rodríguez, C. G.
González, P. B.
Powiązania:
https://bibliotekanauki.pl/articles/259319.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fish swimming
marine propulsion
undulating fin
biomimetic
computational fluid dynamics (CFD)
CFD
Opis:
Aquatic animals, which are the result of many millions of years of evolutionary optimization, are very quick, efficient, robust, and versatile. Accordingly, biologically-inspired mechanisms which emulate the movement of animals have recently become very popular. For the efficient design of a propulsion system it is very important to analyze the fluid flow in detail. CFD (Computational Fluid Dynamics) has become a powerful technique to understand the phenomena because it gives extensive information about the fluid flow characteristics. In the present work, a propulsion system consisting of an undulating fin which emulates the fish swimming was built. In order to optimize the mechanism, several undulating configurations were studied using a 3D turbulent CFD model. The thrust, drag, efficiency and hydrodynamic characteristics were analyzed. Furthermore, it was shown that the efficiency and thrust depend strongly on the oscillation frequency, amplitude and wavelength. In order to validate this CFD model, the numerically obtained thrust was successfully compared with experimental results from the laboratory mechanism.
Źródło:
Polish Maritime Research; 2011, 1; 10-16
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic Absorption of Mortar Composites with Waste Material
Autorzy:
Stumpf González, M. A.
Flach, M.
Reschke Pires, J.
Piva Kulakowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/950217.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustics
comfort
impedance tube
civil construction
waste
Opis:
This paper presents an investigation about acoustic absorption of mortars with partial replacement of sand by waste (plywood formwork, rice husk, and thermoplastic shoe counters), examining different levels of replacement (0%, 5%, 10%, 25%, and 50%). The measurement of acoustic absorption was performed using a plane wave impedance tube with 100 mm diameter, using mortar samples of 20 mm, in frequency range 200-2000 Hz. Results demonstrated that some composite with waste presented noise reduction coefficient (NRC) above the reference mortar (NRC = 0.0343), such as a composite with 50% rice husk (NRC = 0.2757) and other with 50% of plywood waste (NRC = 0.2052). Since there is virtually no cost or difficulty to use these residuals, it may be concluded that it is a sustainable alternative to improve the acoustic comfort and reduce the impact of the waste on the environment.
Źródło:
Archives of Acoustics; 2013, 38, 3; 417-423
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of recent cooling in the Antarctic Peninsula on snow density and surface mass balance
Autorzy:
Recio-Blitz, Cayetana
Navarro, Francisco J.
Otero, Jaime
Lapazaran, Javier
Gonzalez, Sergi
Powiązania:
https://bibliotekanauki.pl/articles/2041910.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
Livingston Island
glacier snow cover
compaction
air temperature
Źródło:
Polish Polar Research; 2018, 39, 4; 457-480
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Efficient Scheduling Methods for Computational Grids and Clouds
Autorzy:
Jakóbik, A.
Grzonka, D.
Kołodziej, J.
Chis, A. E.
González-Vélez, H.
Powiązania:
https://bibliotekanauki.pl/articles/309207.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
batch scheduling
cloud computing
energy efficient
grids
power consumption
resource allocation
Opis:
This paper presents an overview of techniques developed to improve energy efficiency of grid and cloud computing. Power consumption models and energy usage proles are presented together with energy efficiency measuring methods. Modeling of computing dynamics is discussed from the viewpoint of system identication theory, indicating basic experiment design problems and challenges. Novel approaches to cluster and network-wide energy usage optimization are surveyed, including multi-level power and software control systems, energy-aware task scheduling, resource allocation algorithms and frameworks for backbone networks management. Software-development techniques and tools are also presented as a new promising way to reduce power consumption at the computing node level. Finally, energy-aware control mechanisms are presented. In addition, this paper introduces the example of batch scheduler based on ETC matrix approach.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 1; 56-64
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New findings of airborne fungal spores in the atmosphere of Havana, Cuba, using aerobiological non-viable methodology
Autorzy:
Almaguer-Chaves, M.
Aira, M.J.
Rojas, T.-I.
Fernandez-Gonzalez, M.
Rodriguez-Rajo, F.-J.
Powiązania:
https://bibliotekanauki.pl/articles/2081740.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
airborne fungal spores
non-viable methodology
Havana
Cuba
Opis:
Introduction. Although airborne fungal diversity in tropical countries is known to be considerable, aerobiological research to-date has identified only a part of the fungal mycobiota that may have an impact both on human health and on crops. Previous studies in Havana city identified only 30 genera and 5 spore types; therefore,new research is required in these latitudes. This study sought to investigate airborne spore levels in Havana, with a view to learning more about local fungal diversity and assessing its influence in quantitative terms. Materials and method. A Hirst type volumetric sampler was located on the rooftop of a building 35 meters above ground level, in a busy area of the city. Sampling was carried out continuously (operating 24hours/day), at 10 L per minute during the year 2015. The fungal spores were collected on a Melinex tape coated with a 2% silicone solution. The results were expressed as spores per cubic meter (spores/m3) of air when to referring to daily values, and spores count if referring to annual value. Results. Fourteen new genera were identified in the course of volumetric sampling: six produce ascospores and eight conidia. Morphobiometric characteristics were noted for all genera, and airborne concentrations were calculated. These genera accounted for 56.4% of relative fungal frequency over the study year. Conclusions. Many airbone fungi are primary causes of both respiratory disease and crop damage. These new findings constitute a major contribution to Cuba’s aerobiological database.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 349-359
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thirty-four identifiable airborne fungal spores in Havana, Cuba
Autorzy:
Almaguer, M.
Aira, M.-J.
Rodriguez-Rajo, F.J.
Fernandez-Gonzalez, M.
Rojas-Flores, T.I.
Powiązania:
https://bibliotekanauki.pl/articles/51658.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2015, 22, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Residual Strain and Electrical Activity of Defects in Multicrystalline Silicon Solar Cells
Autorzy:
Martínez, O.
Mass, J.
Tejero, A.
Moralejo, B.
Hortelano, V.
González, M.
Jiménez, J.
Parra, V.
Powiązania:
https://bibliotekanauki.pl/articles/1198419.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Am
61.72.Ff
88.40.jj
Opis:
The growth process by casting methods of multi-crystalline Si results in a crystalline material with, among other defects, a high density of dislocations and grain boundaries. Impurity incorporation and their gathering around grain boundaries and dislocations seem to be the main factor determining the electrical activity of those defects, which limit the minority carrier lifetime. In this work, we analyze multi-crystalline Si samples by combining etching processes to reveal the defects, Raman spectroscopy for strain measurements, and light beam induced current measurements for the localization of electrically active defects. In particular, we have explored the etching routes capable to reveal the main defects (grain boundaries and dislocation lines), while their electrical activity is studied by the light beam induced current technique. We further analyze the strain levels around these defects by Raman micro-spectroscopy, aiming to obtain a more general picture of the correlation between residual stress and electrical activity of the extended defects. The higher stress levels are observed around intra-grain defects associated with dislocation lines, rather than around the grain boundaries. On the other hand, the intra-grain defects are also observed to give dark light beam induced current contrast associated with a higher electrical activity of these defects as compared to the grain boundaries.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1013-1016
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 72

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