We evaluated the efficacy of the systemic insecticides dinotefuran, emamectin benzoate, fipronil, and imidacloprid for preventing attacks and brood production of southern pine engraver beetles (Coleoptera: Curculionidae: Scolytinae) and wood borers (Coleoptera: Cerambycidae) on standing, stressed trees and bolt sections of loblolly pine, Pinus taeda L., in eastern Texas. Emamectin benzoate sign...

The analytical approach used to develop a novel fatigue crack growth coupon for highly plastic stress field condition is presented in this paper. The flight hardware investigated is a large separation bolt that has a deep notch, which produces a large plastic zone at the notch root when highly loaded. Four test specimen configurations are analyzed in an attempt to match the elastic-plastic stre...

Strength tests on single lap joints with one adhesive (AV138/HV998) and layer thickness (0.5 mm), three peel stoppers (brass bolt, nylon bolt steel pin), four lengths (12.5 mm, 25 40 mm 100 mm) were conducted to investigate the effects of varying length stiffness peel-stop fasteners. Joint failure stress decreased, but force increased length. Furthermore, joint was higher stopper. The effect br...

In a segmental metro tunnel, it is widely observed that cracks, water leakage and other structural defects usually appear at joint section of smaller stiffness than main tunnel segment section. this study, 3D finite element analysis was conducted to simulate typical concrete explicitly using continuum elements, the performance model validated against laboratory tests available in literature. Si...

This paper is about two arrangements of hyperplanes. The first — the Shi arrangement — was introduced by Jian-Yi Shi to describe the Kazhdan-Lusztig cells in the affine Weyl group of type A. The second — the Ish arrangement — was recently defined by the first author who used the two arrangements together to give a new interpretation of the q, t-Catalan numbers of Garsia and Haiman. In the prese...

Traumatic intracranial aneurysms are one possible complication after penetrating brain injury. A 25-year-old man with a history of major depression presented with a crossbow bolt penetrating the head. On arrival, Glasgow Coma Scale score was E4V5M6, with no apparent neurological deficit. Computed tomography (CT) of the head showed the crossbow bolt passing near the corpus callosum, with surroun...

In this paper we present a new digital ultrasonic instrument for nondestructive inspection of rock bolts using guided waves. The Rock Bolt Tester (RBT) instrument applies long-range ultrasound to investigate bolt’s status, especially its grouting condition. RBT features an application tailored ultrasound probe that transmits high-energy, low frequency (below 100kHz) guided waves and is capable ...

OBJECTIVE To determine if an interlocking bolt would limit subsidence of the biological fixation universal hip (BFX(®)) femoral stem under cyclic loading and enhance construct stiffness, yield, and failure properties. STUDY DESIGN Ex vivo biomechanical study. ANIMALS Cadaveric canine femora (10 pairs). METHODS Paired femora implanted with a traditional stem or an interlocking stem (constr...

It is challenging to assure safe and effective gas mining due the surrounding soft coal rock roads in deep high mines being extremely loose broken. One of ways arrange pre-stressed anchors a certain area roadway rocks form compression arch with joint action rocks, but lack in-depth systematic research on formation mechanism arch, effect difficult give full play. The typical microstructure was o...

This article presents a study on the effect of different protective gloves (which are commercially available and commonly used in the cold) on manual dexterity in cold environments. The experiments compared statistically four different types of gloves and two different types of gloving (outer or double) at +19 °C and -10 °C. Performance was determined both objectively and subjectively using two...