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The main regularities of planar rectangular sparse antenna array with a random radiators distribution at the aperture are analyzed.

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Copyright of Scientific Bulletin of National Mining University is the property of National Mining University, State Higher Educational Institution and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article results are pointed of experimental studies of flow rate wood in the production lumber from oak wood of the set specification and results of application non-destructive inspection method for detecting the main defects in lumber. [ABSTRACT FROM AUTHOR]