Bolts cut from 11-year-old loblolly pines (Pinus taeda L.) were measured to determine the effects of applications of fertilizer and competition control treatments on the amount of pine bark produced. Bark thickness at breast height was not significantly affected by any of the treatments. Regression analysis showed that the dry weight of bark per unit surface area of the bolt increased as the vo...

Abstract Bolts are widely used in transmission lines and key connecting parts of lines. Transmission have been affected by the natural environment for a long time, bolts prone to frequent vibration leading loosening or falling off. Bolt endangers safe stable operation This paper analyses mechanism line screw connection, carries out transverse contrast test common bolt anti-loosening measures, d...

This article presents the application of a self-excited acoustic SAS system for non-destructive testing (NDT) roof-bolt housings in laboratory and real mine conditions. The proposed with filtering mechanism was applied to J64-27 composite anchors. conducted tests allowed successful confirmation usefulness detection rod defects, damage coupling anchor rock mass stress state itself. eliminating e...