Purpose: determination of correlation's degree between speed, power and speed-power abilities of professional hockey players on ice and out of ice. Material: 65 professional hockey players of age from 16 to 33 years old were tested. 75 highly qualified coaches were questioned. Results: The found out interconnections between 11 indicators of speed, power and speed power qualities supplement knowledge about transfer physical qualities. We detected high interconnection between speed and speed-power abilities, manifested by sportsmen in exercises on ice and on land. We registered moderate level of interconnection between static (absolute) power and speed abilities of hockey players. We proved hypothesis about possibility of start speed (power) transfer in different conditions of its manifestation. Conclusions: the received data permit to correct hockey players' training program, considering new knowledge about transfer of one or the other physical qualities on sportsmen's training.
The article describes a method for assessing the strength reliability of high-temperature heat exchangers with service life of several tens of thousands of hours at the design stage, when there is not enough statistical data on the operating time of elements and material properties. The method shows, how to determine the missing coefficients of variation for calculating reliability and build the function of the probability of failure-free operation, considering the change of the properties of the structural material over time. The method of visualizing the distribution of zones, both satisfying and not satisfying reliability criteria at the nodes of any finite element model, is also described.
Authors present a comparative efficiency analysis of application of k-means and k-medoids clustering models for solving the problem of grouping of semiconductor devices into homogeneous production batches using three types of metrics: Euclidean distance, Mahalanobis distance, Manhattan distance.
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