We prove that any supersymmetric solution to five-dimensional minimal gauged supergravity with $SU(2)$ symmetry, is timelike outside an analytic horizon, a Gutowski-Reall black hole or its near-horizon geometry. The proof combines delicate analysis the general form for K\"ahler metric cohomogeneity-1 symmetry. also soliton this theory, symmetry and nut complex bolt, has base enhanced $U(1)\time...

To resolve insufficient traditional bolt supports due to the complexity of geological conditions, optimal design an expanded head was investigated by using theoretical calculations and experiments. The results show that drawing capacity is affected bearing front rear ends, side capacity, friction resistance. For a circular anchor bolt, stepped semi-ellipsoidal with increase in section’s radius,...

Structural bolts are critical components used in different structural elements, such as beam-column connections and friction damping devices. The clamping force is highly influenced by the bolt rotation. Much of existing vision-based research about rotation estimation relies on traditional computer vision algorithms Hough transform to assess static images bolts. This requires careful image prep...

The nondestructive testing technique used to evaluate the quality of bolt support by detecting axial force is suitable for with a short construction time. For in state long time period, it may lead detection small only and ignore fact that has entered necking fracture stage, thus fail detect safety hazards Three sets parallel tests were conducted solve misjudgment results due reduction when was...

Design parameters such as initial bonding section, prestress, and stiffness have a significant impact on the mechanical properties of full-length bonded prestressed bolt. In order to understand influence above three axial force shear stress anchor bolts under condition rock separation, theoretical numerical models were established, sensitivity different was analyzed based grey correlation metho...