The DARPA BOLT Information Retrieval evaluations target open-domain natural-language queries over a large corpus of informal text in English, Chinese and Egyptian Arabic. We outline the goals of BOLT IR, comparing it with the prior GALE Distillation task. After discussing the properties of the BOLT IR corpus, we provide a detailed description of the query creation process, contrasting the summa...

To explore the bolt-grouting method of deep roadway under three-dimensional unequal ground stress, a unidirectional coupling model surrounding rock plastic failure and grouting diffusion considering influence excavation disturbance stress was established. Spatial evolution characteristics diffusion, impact spacing row bolts/cables on grout were simulated by using numerical method. The results r...

Bolted joints are used widely in mechanical design and represent a weak link in a system where loss of joint clamping force can lead to degraded product performance or human injury. To meet current market demands, designers require reliable material data and analysis tools for their industry specific materials. The viscoelastic response of bolted aluminum joints used in the small die-cast engin...

Conventional bolt–shotcrete support technology is usually single-layered, which does not meet the requirements of strength and stiffness for roadway support. Therefore, in this paper, new combined technology, including a multiple-layered staggered dense arrangement bolts, laying steel meshes, pouring shotcrete, strengthening long cables, full cross-section grouting, proposed. Specifically, foll...

ABERDEEN 29 s Aberdeen Research and Development Center AFETR s Air Force Eastern Test Range AFGWC see GWC ALOHA 35 i Aloha Network, University of Hawaii ALOHA-TIP 163 s Aloha Network, University of Hawaii AMEC see Belvoir AMES-67 16 NASA Ames Research Center AMES-ILLIAC see ILLIAC AMES-TIP 144 NASA Ames Research Center ARPA-TIP 156 Advanced Research Projects Agency BBN 1D 197 Bolt Beranek and N...

A floor rock roadway under an oblique straddle working face is a typical dynamic pressure roadway. Under the complex disturbance of excavation engineering works, often undergoes stress concentration and severe deformation damage. To solve problem surrounding stability control for this type, study considered East Forth main transport in strata 1762(3) Pansan coal mine. In situ ground monitoring ...

Abstract For road tunnels in most Nordic countries, temporary rock support installed during tunnel excavation usually becomes a part of the permanent support. Rock bolts are common measure excavated hard rock, and their conditions over period operation play significant role safety these tunnels. The bolt types aggressive environmental considered this research focused on those used observed Norw...