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71.
72.
Janko Marovt 《Linear and Multilinear Algebra》2013,61(9):1707-1723
73.
A mechanical system's modal parameters change when fatigue loading is applied to the system. In order to perform an accelerated vibration-based fatigue test these changes must be taken into account in order to maintain constant-stress loading. This paper presents an improved accelerated fatigue-testing methodology based on the dynamic response of the test specimen to the harmonic excitation in the near-resonant area with simultaneous monitoring of the modal parameters. The measurements of the phase angle and the stress amplitude in the fatigue zone are used for the real-time adjustment of the excitation signal according to the changes in the specimen's modal parameters. The presented methodology ensures a constant load level throughout the fatigue process until the final failure occurs. With the proposed testing methodology it is possible to obtain a S-N point of the Woehler curve relatively quickly and to simultaneously monitor the changes of the specimen's natural frequency and damping loss factor. The presented methodology with real-time control is verified on an aluminum Y-shaped specimen (106 load cycles are achieved in 21 min) and is applicable to a specimen with arbitrary geometry. Besides the faster completion of the fatigue test the methodology can be adopted for the validation of the vibrational fatigue analysis. 相似文献
74.
75.
Zvonimir Janko 《Archiv der Mathematik》2011,96(2):105-107
We give here a complete classification of the title groups (Theorem A). 相似文献
76.
This paper presents the stable isotope data of oxygen (δ18O) and hydrogen (δ2H) in groundwater from 83 sampling locations in Slovenia and their interpretation. The isotopic composition of water was monitored over 3 years (2009–2011), and each location was sampled twice. New findings on the isotopic composition of sampled groundwater are presented, and the data are also compared to past studies regarding the isotopic composition of precipitation, surface water, and groundwater in Slovenia. This study comprises: (1) the general characteristics of the isotopic composition of oxygen and hydrogen in groundwater in Slovenia, (2) the spatial distribution of oxygen isotope composition (δ18O) and d-excess in groundwater, (3) the groundwater isotope altitude effect, (4) the correlation between groundwater d-excess and the recharge area altitude of the sampling location, (5) the relation between hydrogen and oxygen isotopes in groundwater in comparison to the global precipitation isotope data, (6) the groundwater isotope effect of distance from the sea, and (7) the estimated relation between the mean temperature of recharge area and δ18O in groundwater. 相似文献
77.
78.
Zvonimir Janko 《Mathematische Zeitschrift》2006,253(2):419-420
In this note we determine finite nonabelian 2-groups G all of whose nonabelian subgroups are generated by involutions and show that such groups must be quasi-dihedral. This solves
the problem Nr. 1595 for p = 2 in [1]. 相似文献
79.
Zvonimir Janko 《Israel Journal of Mathematics》2006,154(1):157-184
We present an elementary proof of the classification theorem for finite nonmodular quaternion-free 2-groups. This proof does
not involve the structure theory of powerful 2-groups. Such a new proof is also necessary, since there are several gaps in
the original proof given in [5]. 相似文献
80.