We report a case of fixation of a scaphoid fracture using an Acutrak(®) screw. This screw is cannulated and headless, which allows it to be implanted below the surface of the bone. It uses the same concept of variable thread pitch as the Herbert screw, but unlike the Herbert screw, is fully threaded, with continuously varying pitch along its length. This variable pitch creates constant compress...

This paper proposes to use zooming function of digital cameras for robust character recognition and to control focal length for improving the performance even in dim light conditions. For this purpose, we determine the optimum focal length vs. camera-object distance through several recognition experiments. Recognition performance for insufficient illuminated images can be enhanced by adopting t...

The nominal directivity for uniformly spaced broadside parallel half-wave dipoles associated with a uniform excitation is evaluated. The amplitude distribution for an optimized directivity is then obtained for different numbers of elements with the separations between the dipoles as a variable. The optimum and nominal directivities are compared for different spacings of the elements. While thes...

Based on the analysis of seepage mechanism of fracturing wells in low permeability reservoir, this paper establishes the capacity model of the vertical fractured well production under the factors of Start-up pressure gradient, pressure sensitive effect and the artificial fracture length. The numerical simulation is compiled and software calculates the capacity model by using numerical simulatio...

Altered bone structure and function contribute to the high rates of fractures in dialysis patients compared to the general population. Fracture events may increase the risk of subsequent adverse clinical outcomes. Here we assessed the incidence of post-fracture morbidity and mortality in an international cohort of 34,579 in-center hemodialysis patients in the Dialysis Outcomes and Practice Patt...

An accurate temperature profile of the multi-stage fractured horizontal well is foundation production interpretation using distributed sensing. In this paper, an oil-water two-phase flow prediction model considering stress sensitivity effect and Joule–Thomson constructed. Based on simulation calculation, wellbore variation under different formation parameters, water cuts, fracture parameters di...

The high demands placed on the upper extremity in sporting activities subject the competitive athlete to common injuries of the hand. Treatment options are based on the fracture configuration, associated extremity injuries, and status of the surrounding soft tissue. Metacarpal and phalangeal fractures may usually be treated by closed, nonoperative methods, and most athletes may quickly return t...

Fracture toughness resistance curves describe a material's resistance against crack propagation. These curves are often used to characterize biomaterials like bone, nacre or dentin as these materials commonly exhibit a pronounced increase in fracture toughness with crack extension due to co-acting mechanisms such as crack bridging, crack deflection and microcracking. The knowledge of appropriat...

As fretting fatigue cracks are initiated at an early stage of life, the fretting fracture process is dominated by the stable growth of cracks. Hence the measurement of crack length is very important. This paper demonstrates the suitability of the DC potential drop technique for the measurement of fretting cracks. A calibration has been established for monitoring crack growth in BS L65 copper al...