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Wyświetlanie 1-15 z 15
Tytuł:
Mean-Field and Monte Carlo Study of a Mixed Ferro-Ferrimagnetic Ternary Alloy
Autorzy:
Dely, J.
Bobák, A.
Horváth, D.
Powiązania:
https://bibliotekanauki.pl/articles/1813809.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.10.Ln
75.10.Hk
75.50.Gg
Opis:
We present a study of the magnetic properties of a mixed ferro-ferrimag-netic ternary alloy of the type $AB_p C_{1-p}$ on a cubic lattice consisting of three different Ising spins $S_A$ =3/2, $S_B$ = 2, and $S_C$ = 5/2. We employ the mean-field approximation and Monte Carlo simulation to find the compensation temperatures of the system for selected values of the parameters in the model Hamiltonian. In particular, the relation between considered mixed ferro-ferrimagnetic model and magnetic properties of the ternary metal Prussian blue analog such as $(Fe_p^{II}Mn_{1-p}^{II})_1.5$ $[Cr^{III}(CN)_6] \cdot nH_2O$ is discussed.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 461-464
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defect Sensitivity of Magnetic Dot Arrays Influenced by Thermal Activation and Intradot Anisotropy
Autorzy:
Baláž, P.
Horváth, D.
Gmitra, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813931.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Az
74.25.Fy
74.72.Bk
02.70.Bf
Opis:
The influence of non-magnetic central node defect on magnetic hysteresis of regular square-shaped segment of magnetic dot array with perpendicular uniaxial anisotropy under the thermal activation was investigated via computer simulations based on stochastic Landau-Lifshitz-Gilbert equation. The aim of this study is to point out the simultaneous effect of anisotropy and thermal activation to the dynamical properties of magnetic dot arrays.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 583-586
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermally Assisted Current-Driven Dynamics in Asymmetric Spin Valves
Autorzy:
Gmitra, M.
Barnaś, J.
Horváth, D.
Powiązania:
https://bibliotekanauki.pl/articles/1813513.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.60.Ch
75.70.Cn
Opis:
Current-induced steady precessional modes in standard spin valves are usually excited as an interplay of spin-transfer torque, Gilbert damping, and external magnetic field. We propose an asymmetric spin valve, in which the spin current can excite stationary precessional modes also at zero external magnetic field. We also show that finite temperature can induce transitions between different dynamical modes. These transitions, in turn, lead to telegraph noise in magnetoresistance.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 31-34
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect Of Void Formation On The Reliability Of ED-XRF Measurements In Lead-Free Reflow Soldering
Wpływ powstawania pustek na wiarygodność badań ED-XRF bezołowiowych złączy lutowanych rozpływowo
Autorzy:
Koncz-Horváth, D.
Gergely, G.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/355754.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
EDXRF
lead-free
void
intermetallic
reflow
ED-XRF
złącze bezołowiowe
pustka lutownicza
lutowanie rozpływowe
cząstka międzymetaliczna
Opis:
In lead-free reflow soldering, the presence of voids should be taken into account. For this reason, the effect of the applied heating profiles was examined via the characterization of voids in galvanic and immersion Sn coatings. According to EU Directive 2002/95/EC, the screening of Pb element of reflow soldering (i.e. of electrical and electronic equipment) is necessary; and the practical implementation of this measurement is largely affected by the characteristics of the solder (i.e. the presence of voids and the inhomogeneity of the solder). Comparing the results of the above two coating methods, it was found that by chemical coating more voids were formed and the detected lead content was higher than for galvanic Sn. The standard deviation of Ag and Cu concentrations was mainly influenced by the appearance of large compounds in the second case, while with chemical coating, no large compounds were formed due to the elevated number of voids.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1445-1448
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Whisker-Like Formations in Sn-3.0Ag-Pb Alloys
Autorzy:
Koncz-Horváth, D.
Gergely, G.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/351400.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Sn-Ag alloy
soldering
whisker formation
microstructure analysis
Opis:
In this study, different types of whisker-like formations of Sn-3.0Ag based alloy were presented. In the experimental process the amount of Pb element was changed between 1000 and 2000 ppm, and the furnace atmosphere and cooling rate were also modified. The novelty of this work was that whisker-like formations in macro scale size were experienced after an exothermic reaction. The whiskers of larger sizes than general provided opportunities to investigate the microstructure and the concentration nearby the whiskers. In addition, the whisker-like formations from Sn-Ag based bulk material did not only consist of pure tin but tin and silver phases. The whisker-like growth appeared in several forms including hillock, spire and nodule shaped formations in accordance with parameters. It was observed that the compound phases were clustered in many cases mainly at hillocks.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1027-1031
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revealing Ownership Structure of Funds Using Minimum Spanning Tree
Autorzy:
Rešovský, M.
Gróf, M.
Horváth, D.
Gazda, V.
Powiązania:
https://bibliotekanauki.pl/articles/1377836.pdf
Data publikacji:
2014-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
89.65.Gh
Opis:
The traditional method of analysing a time series of stocks and funds is to use simple Pearson correlations. However, experience shows that cross-correlations are not an accurate indicator of the mutual ownership relations. We show that the minimum spanning tree methodology, previously used to perform more comprehensive studies of asset returns correlations, can be used to deduce the underlying ownership structure with reasonable accuracy. We also show that adjusting the time series for a common trend of stocks and subsequent filtering of the short term variations of returns using the ARIMA model is a prerequisite for this application of the minimum spanning tree.
Źródło:
Acta Physica Polonica A; 2014, 126, 6; 1322-1326
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability Examinations of SAC Lead Free Solder Material
Autorzy:
Koncz-Horváth, D.
Gergely, G.
Gyökér, Z.
Gácsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/354957.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SAC
thermal shock test
intermetallic layer
crack
Opis:
In this paper the effect of soldering technique and thermal shock test were investigated on SAC 305 solder joints, produced by two different solder method. The solder joints were subjected to different cycle numbers up to 5000 thermal shock tests with two different thermal profiles of –30/+110°C and –40/+125°C. Microstructural properties of the tested joints were examined with the focus on intermetallic layer thickness and crack formation/propagation. Thickness of the scallop shaped Cu6Sn5 intermetallic layer was increased with increasing cycle number for both THRS and multiwave joints, but the thickening was more effective for the THRS joints. Cracks typically formed at the solder alloy/PTH barrel and the solder alloy/pin interfaces and propagated along grain boundaries and precipitations of intermetallic compound.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 925-930
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Crack Detection Method with 2 Dimensionally Generated 3 Dimensionally Reconstructed Images in THT Solder Joints
Autorzy:
Gergely, G.
Koncz-Horváth, D.
Weltsch, Z.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/355906.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
serial sectioning
reconstruction
total crack length
TCL
through hole technology
THT
Opis:
This work represents an interesting development in the detection and interpretation of crack evolution in through hole technology (THT) solder joints, which based on the development of general and common method. Serial sectioning is a useful method because it overcomes the problems associated with traditional two-dimensional metallographic techniques by providing information about (micro)structures in three-dimensions. In our work, serials sectioning with reconstruction method was utilized to visualize the 3D nature of cracks in through hole solder joint. Accurate quantitive analysis of the cracks, such as crack length, position and extension are presented with a help of the developed method: newly defined parameter and serial-cross sectioning method.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1033-1038
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Ceramic Particles on the Microstructure and Mechanical Properties of SAC305 Lead-Free Soldering Material
Autorzy:
Kumar, Manoj Pal
Gergely, G.
Koncz-Horvath, D.
Gacsi, Z.
Powiązania:
https://bibliotekanauki.pl/articles/356293.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
composite solder
SiC particles
microstructure
wettability
microhardness
Opis:
In this study, silicon carbide (SiC) reinforced lead-free solder (SAC305) was prepared by the powder metallurgy method. In this method SAC305 powder and SiC powder were milled, compressed and sintered to prepare composite solder. The composite solders were characterized by optical and scanning electron microscopy for the microstructural investigation and mechanical test. Addition of 1.5 wt.% and 2 wt.% ceramic reinforcement to the composite increased compressive strengths and microhardness up to 38% and 68% compared to those of the monolithic sample. In addition, the ceramic particles caused an up to 55% decrease in the wetting angle between the substrate and the composite solder and porosity was always increased with increase of SiC particles.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 603-606
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-wetting to Wetting Transition Temperatures of Liquid Tin on Surfaces of Different Steel Samples Corresponding to their Spontaneous Deoxidation
Autorzy:
Varanasi, D.
Aldawoudi, K. E
Baumli, P.
Koncz-Horvath, D.
Kaptay, G.
Powiązania:
https://bibliotekanauki.pl/articles/2049712.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wetting transition
deoxidation
contact angles
steels
liquid tin
Opis:
The goal of this paper is to measure the non-wetting to wetting transition temperatures of liquid tin on surfaces of different steel samples in vacuum with residual pressure of 10-8 bar. The experiments were conducted on four steels (C45, S103, CK60 and EN1.4034) of varying compositions using pure tin (99.99%) by the sessile drop method. Non-wetting to wetting transition (contact angle decreasing below 90°) by liquid tin was observed as function of increasing temperature in the range of 820-940 K for low alloyed steels C45, S103 and CK60, while it was considerably higher (around 1130 K) for high chromium EN1.4034 steel. it is concluded that at about the same temperatures, the surfaces of the steel samples are spontaneously deoxidized due to the combined effect of high temperature, low vacuum and C-content of steels. After the oxide layer is removed, the contact angles of liquid tin on steel surfaces were found in the range of 45-80° for low alloyed C45, S103 and CK60 steels and around 20° for high chromium EN1.4034 steel. These relatively high contact angle values compared to other metal/metal couples (such as liquid Cu on steels) are due to the formation of not fully metallic intermetallic compounds (FeSn and FeSn2) at the interface (such do not form in the Cu/Fe system).
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 469-476
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutrient content restructuring and CT-measured density, volume attritions on damaged beans caused by Acanthoscelides obtectus Say (Coleoptera: Chrysomelidae)
Autorzy:
Keszthelyi, S.
Egri, H.B.
Horvath, D.
Csoka, A.
Kovacs, G.
Donko, T.
Powiązania:
https://bibliotekanauki.pl/articles/65538.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
leguminous plant
plant product
nutrient content
bean
pest
risk
computer tomography
Acanthoscelides obtectus
Coleoptera
Chrysomelidae
density
storage
Opis:
Leguminous plant products have great nutritional and economic importance in the European Union, which is reflected by its protein policy. These harvested yields are risked by stored product pests, such as Acanthoscelides obtectus Say, which can cause up to 50–60% loss in stored bean items. The bean weevil causes both quantitative and qualitative damage to seeds. We aimed to map the qualitative damage of this devastating pest, which deteriorates the nutritional content of bean kernels. Furthermore, our purpose was to determine accurately the decrease in the volume and density alteration in beans caused by this important stored product pest using CT-assisted imaging analysis. Our results showed that the nutritional arrangement in damaged beans was caused by A. obtectus. The measured nutrient content increment in damaged samples can be explained by the presence of extraneous organic material which originates from perished specimens of the bruchin pest. This is a negative phenomenon in bean items used as forage, because of the loss of valuable proteins and rancidity in herbal oils. Weight loss triggered by developing larvae was 49.42% in examined bean items. The use of 3D technologies has greatly improved and facilitated the detailed investigation of injured seeds. The density (75,834 HU; 41.93%) and the volume (296.162 mm3; 26.21%) values measured by CT of the examined samples were significantly decreased. The decreasing of tissue density in damaged beans can be accounted for by the consumption of starch present at a high ratio and that of the dense reserve components in the cotyledons.
Źródło:
Journal of Plant Protection Research; 2018, 58, 1
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
KEr(MoO$\text{}_{4}$)$\text{}_{2}$ and CsDy(MoO$\text{}_{4}$)$\text{}_{2}$ - Low-Dimensional Ising Magnets
Autorzy:
Kačmár, M.
Orendáčová, A.
Čizmár, E.
Horváth, D.
Orendáč, M.
Bondarenko, V.
Anders, A. G.
Feher, A.
Jaščur, M.
Powiązania:
https://bibliotekanauki.pl/articles/2013657.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
75.10.Hk
75.40.Mg
Opis:
In the present work the behaviour of cluster excitations in magnetic field, B, parallel to the easy axis was experimentally studied by the measurements of KEr(MoO$\text{}_{4}$)$\text{}_{2}$ and CsDy(MoO$\text{}_{4}$)$\text{}_{2}$ specific heat, C, vs. B dependence studied at a constant temperature. Corresponding Monte Carlo simulations of C revealed that despite of the fact that the Ising exchange-coupling models proved useful for a sufficient description of the specific heat of these dipolar systems in B=0, the analysis of current experimental data requires a partial renormalization of exchange-coupling constants previously obtained from B=0 analysis. The influence of crystal field effects and long-range character of spin correlations is discussed.
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 807-810
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transgraniczny model transportowy między Austrią i Węgrami
Transport model for the cross-border area between Austria and Hungary
Autorzy:
Horváth, B.
Horváth, R.
Juhász, M.
Koren, C.
Miletics, D.
Powiązania:
https://bibliotekanauki.pl/articles/249194.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
Tematy:
modelowanie transportu
Austria
Węgry
transport modelling
Hungary
Opis:
W artykule przedstawiono Austriacko-Węgierski Model Transportu Przygranicznego wykonywany w ramach Programu Austriacko-Węgierskiej Współpracy Przygranicznej w latach 2007-2013.
The paper introduces the preparation of the Austria-Hungary Cross-border Transport Model carried out in the framework of the Cross-border Cooperation Programme Austria-Hungary 2007-2013.
Źródło:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne; 2014, 1(103); 111-121
1231-9171
Pojawia się w:
Zeszyty Naukowo-Techniczne Stowarzyszenia Inżynierów i Techników Komunikacji w Krakowie. Seria: Materiały Konferencyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of cardiopulmonary changes during cycle and treadmill tests
Porównanie zmian sercowo-płucnych podczas testów na rowerze i bieżni
Autorzy:
Nagy, D.
Horváth, Z.
Melczer, C.
Derkács, E.
Ács, P.
Oláh, A.
Powiązania:
https://bibliotekanauki.pl/articles/2048470.pdf
Data publikacji:
2020
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
treadmill test
bicycle ergometry test
stress test
athletes
test na bieżni
test ergometru rowerowego
test wysiłkowy
sportowcy
Opis:
Background. Our pilot study aimed to investigate cardiopulmonary differences between vita maxima incremental cycle and treadmill tests among elite youth cyclists. Material and methods. 8 elite youth cyclists (6 male, 2 female; age: 17.125±1.8 years) completed a cycle ergometer test using a road racing bike on a Tacx Smart Flux roller, followed by a vita maxima treadmill test 48 hours later. Aerobic capacity, cardiopulmonary, and metabolic parameters were measured during both tests. Results. Based on the paired sample t-test, and Wilcoxon signed-rank test, the maximal load values (W) on the treadmill were significantly higher (t=3.52; p<0.05) than in the cycle test. Volume of utilized oxygen (VO2; ml/min) and volume of exhaled CO2 (VCO2; ml/min) values (t=4.76 and t=3.45; p<0.05), maximal fat oxidation (Fatmax; g/day) (t=4.34; p<0.05), maximum rate of oxygen consumption (VO2max; ml/kg/min) (t=4.9; p<0.05) and rate of oxygen consumption at lactate threshold (VO2atLT; ml/kg/min) (t=4.04; p<0.05) also showed significantly higher values than in treadmill test. Pearson’s correlation study showed significant correlation between VO2atLT, and most other parameters (VO2, ventilation (VE; BTPS l/min), load at lactate threshold (load at LT), energy expenditure (EE; g/day)). Conclusions. The differences in results may be because of sport-specific adaptation to cycling and the characteristics of running and cycling, such as the different muscle contraction composition (concentric and eccentric) and different metabolic demands. These findings must be taken into account when testing cyclists on a treadmill, and planning their training loads based on these results.
Wprowadzenie. Badanie pilotażowe miało na celu zbadanie sercowo-płucnych różnic przyrostowej vita maxima podczas testów na rowerze i bieżni przeprowadzonych wśród czołowych młodych rowerzystów. Materiał i metody. Ośmioro czołowych młodych rowerzystów (sześciu mężczyzn i dwie kobiety w wieku 17.125±1.8 roku) wykonało najpierw cykl na ergometrze rowerowym z wykorzystaniem roweru wyścigowego Tacx Smart Flux roller, a 48 godzin później test vita maxima na bieżni. Podczas obydwu testów zmierzono wydolność tlenową oraz parametry sercowo-płucne i metaboliczne. Wyniki. Na podstawie badania t par próbek i testu Wilcoxona dla par obserwacji ustalono, że maksymalne wartości obciążenia (W) na bieżni były znacząco wyższe (t=3,52; p<0,05) niż na rowerze. Wartości zużycia tlenu (VO2; ml/min) i wydalonego dwutlenku węgla (VCO2; ml/min) (t=4,76 i t=3,45; p<0,05), maksymalna oksydacja tłuszczu (Fatmax; g/dzień) (t=4,34; p=<0,05), maksymalne zużycie tlenu (VO2max; ml/kg/min) (t=4,9; p<0,05) i zużycie tlenu na progu mleczanowym (VO2atLT; ml/kg/min) (t=4,04; p<0,05) okazały się z kolei istotnie wyższe w teście na bieżni. Badanie korelacji Pearsona wykazało korelację między VO2atLT i większości pozostałych parametrów (VO2, wentylacja (VE; BTPS l/min), obciążenie na progu mleczanowym (load at LT), wydatek energetyczny (EE; g/dzień)). Wnioski. Różnice w uzyskanych wynikach mogły zostać spowodowane predyspozycjami do wykonywania konkretnego sportu, w tym wypadku jazdy na rowerze oraz różnicami między jazdą na rowerze i bieganiem w zakresie struktury kurczliwości (współśrodkowy i niewspółśrodkowy), a także różnymi wymaganiami metabolicznymi. Obserwacje muszą być uwzględnione podczas badania rowerzystów na bieżni i planowania obciążenia ich treningów.
Źródło:
Health Problems of Civilization; 2020, 14, 3; 228-234
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmission of second-hand smoke sensitivity and smoking attitude in a family
Autorzy:
Tarnoki, D.L.
Tarnoki, A.D.
Littvay, L.
Lazar, Z.
Karlinger, K.
Molnar, A.A.
Melicher, D.
Garami, Z.
Berczi, V.
Horvath, I.
Powiązania:
https://bibliotekanauki.pl/articles/52085.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-15 z 15

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