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1
Content available Ageing of cadmium telluride radiation detectors and its diagnostics with low frequency noise
Andreev A., Sik O., Grmela L., Sikula J.
Metrology and Measurement Systems
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2013
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Vol. 20, nr 3
385--394
EN
Samples of CdTe single crystals which are used as radiation detectors were periodically measured during a long time interval with different values of an applied voltage. The samples were also periodically exposed during long time periods to high temperatures of 390 K and to rapid changes of temperature from 300 K to 390 K. After 1.5 years of measurements we observed ageing of the samples which resulted in deterioration of their transport characteristics. The resistance of the samples increased significantly and current-voltage characteristics were unstable in time. Noise spectroscopy showed that low frequency noise can be used for detection of CdTe sample ageing as its spectral density increases significantly comparing to the 1/f noise of a high quality sample.
2
Content available Perspective method to guarantee the reliability for the rolling stock of the railway
Golybenko A., Gubacheva L., Andreev A., Mokrousov S., Shcherbakov V.
Transport Problems
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2012
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T. 7, z. 4
33-37
EN
The design method how to increase the reliability of the railroad underframe frictional dampers has been given. The new design for frictional wedge has been suggested, it helps to decrease both the wear of friction wedge and the deterioration of the connected with shpinton sleeve.
3
Content available Forming the intermodal system of freight transportation on the east of Ukraine
Golubenko A., Gubacheva L., Andreev A.
Transport Problems
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2012
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T. 7, z. 2
27-35
EN
In this work the method of volumetric-calendar planning and production schedule drafting- the network planning - have been considered for the case, which is related to serial or serial-parallel execution of certain works and operations in order to shorten the total delivery cycle of intermodal freight in containers.
4
Content available Logistic management by freight traffics of contiguous types of transport
Golybenko A., Gubacheva L., Andreev A.
Transport Problems
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2010
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T. 5, z. 3
83-88
EN
The results of investigation of interaction of two contiguous types of sea and railway transport are presented by means of the method of factor-by-factor analysis. Logistic system of management by the freight and wagon traffics is offered, which will allow considerably to shorten time of transfer of freight units from one type of transport to another.
5
Content available Forming of logistical system of organization of freight transportations in megapolises
Golubenko A., Gubacheva L., Andreev A.
Transport Problems
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2009
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T. 4, z. 3, cz.2
97-103
EN
The questions of forming of the logistical system of organization of freight transportations in megapolises on terminal technology are considered. Solution of task of choice of optimum location of distributive centre and decreasing of total expenditures on delivery of freight is offered.
6
Content available The quantum diffusion of carbon in alfa-iron in low temperature
Dąbrowski L., Andreev A., Georgiev M.
Nukleonika
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2006
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Vol. 51, nr 2
93-99
EN
Recent experimental data on the diffusion coefficient of carbon in á-iron below liquid nitrogen temperature (LNT) question the classical approach to the observed temperature dependence. As the temperature is lowered below LNT, the diffusion constant tends to a nearly temperature-independent value rather than continuing its activated trend. The low temperature branch is apparently characteristic of a quantum mechanical process dominated by tunneling in ground state. Concomitantly we apply an occurrence-probability approach to describing the overall temperature dependence as a single continuous rate. Within the adiabatic approximation the electronic eigenvalue depending parametrically on the nuclear coordinates is taken to be the potential energy to control the motion of the nuclei. The resulting rate involves all horizontal-tunneling energy-conserving elastic transitions at the quantized energy levels of the migrating atom. A small though not negligible slope in the temperature dependence as the temperature is raised below 100 K is dealt with by complementing for the rate of a parallel one-phonon inelastic-tunneling process in excess to the basic elastic-tunneling rate. Our combined approach agrees well with the experimental data. In particular, the frequency of the coupled vibration is obtained virtually identical to the carbon vibrational frequency from inelastic neutron scattering data. The migrational barrier is also found to be within the limits expected for alfa-iron.
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