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1

Wetting ability of Ag(Cu, Zn, Ga) alloys on graphite substrate

Weltsch Z., Lovas A., Cziraki A., Tichy G., Toth A. L.

International Journal of Applied Mechanics and Engineering

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2010

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Vol. 15, no 2

389-395

EN

The temperature dependence of wetting angles (T) of Ag-M based melts (M: Cu, Zn, Ga) on graphite substrates are compared. The slope of (T) is negative, which follows from the Eötvös rule. The difference in the slope arises from the M alloying elements. A texture formation was found in the substrate/drop interphase region after solidification. The enrichment (segregation) of Ag atoms in the interface layer was observed in the Ag-Ga alloy in the solidified structure. The action of the melt temperature was examined also on the degree of texture formation, which seems to be coupled with the magnitude of the contact angle.

2

The role of surface and bulk structure in the thermopower characterization of perlitic carbon steels

Szabo A., Lovas A.

International Journal of Applied Mechanics and Engineering

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2010

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Vol. 15, no 2

349-354

EN

For the study of stress state and the level of heat treatment in engineering alloys, the thermo power (S) measurement is proposed as an acceptable method after a suitable calibration. In this paper, we focus on the determination of the influence of phase relations from the point of view of thermo power using industrial pearlitic carbon steels. The results of thermoelectric power measurements reported in this paper do confirm the applicability of S (T) measurements as non-destructive testing of quench hardening in pearlitic steels.

3

In vivo deformability of human lumbar spine segments in pure centric tension measured during traction bath therapy

Kurutz M., Lovas A., Bene E.

Acta of Bioengineering and Biomechanics

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2003

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Vol. 5, nr 1

67-92

EN

In vivo tensile deformability of human lumbar spine segments has been measured during the usual ,traction bath hydrotherapy of patients when the effect of muscles can be excluded, and the lumbar spine is subjected to pure centric tensile load. Elongations of segments LIII-IV, LIV-V and LV-SI have been measured by using a special computerised subaqueous ultrasound measuring method developed by the authors. Influence of biomechanical parameters, aging, sex, body weight and height, body mass index (BMI) has been established; moreover, time-dependence of deformability has also been measured. The aim of the experiments was double: partly to clear the tensile effect of the traction bath therapy, and partly obtain the in vivo numerical traction model of human lumbar motion segments. This report deals with in vivo tensile deformability of lumbar segments only. The biomechanical parameter analysis and the time-dependent numerical creep model of human lumbar spine segments will be reported in forthcoming papers.

4

Influence of heat-treatment and magnetic field on the ultrasound velocities in the Fe72.5Cu1Nb4Sil3.5B9 amorphous ribbons

Kaczkowski Z., Milewska E., Lovas A.

Hydroacoustics

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2000

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Vol. 3

231--236

EN

Ultrasound velocities as the functions of the bias magnetic field and annealing temperature were investigated in the Fe72.5Cu1Nb4Sil3.5B9 alloy. The samples were annealed in vacuum for 1 h in the temperature range from 200 to 700oC The maximum changes were observed after annealing at the temperature of 450oC when the magnetomechanical coupling coefficient reached maximum value (k = 0.62). The ultrasound velocities were ehanging from 3.5 to 5.3 km/s depending on the magnetic bias field and the thermal-treatment history.