OBJECTIVES Three operative techniques have been described to correct thoracolumbar kyphotic deformity (TLKD) resulting from ankylosing spondylitis (AS) at the level of the lumbar spine: opening wedge osteotomy, polysegmental wedge osteotomies, and closing wedge osteotomy. Little knowledge exists on the indication for, and outcome of these corrective lumbar osteotomies. METHODS A structured re...

The Nomex honeycomb core has been widely used in many industrial fields, especially the aircraft and aerospace industries, due to its high strength stiffness heaviness ratio. Machining of structure is usually associated with tearing walls, deformations cells appearance burrs. Therefore, milling represents an hurdle challenge for scientists researchers about quality machined surface integrity cu...

Abstract Swimmers that can convert external energy to dynamic movement have shown great potential in different fields; however, their applications are restrained due the demerits of high cost, environmental pollution, and low efficiency exiting propelling methods. Herein, droplets proposed use whose motions restricted fixed positions or specified areas propel a superhydrophobic swimmer with sup...

Edge diffraction can be introduced into Geometrical Acoustics mainly by three models: detour-based, energetic and wave-based diffraction models. In the past, we thoroughly compared Maekawa's detour law, the uncertainty relation based diffraction method and the secondary source model by the example of edge diffraction of a single wedge. However, the influence of the wedge shape has not yet been ...

Radiotherapy represents the most widely spread technique to control and treat cancer. To increase the treatment efficiency, high energy linacs are used. However, applying high energy photon beams leads to a non-negligible dose of neutrons contaminating therapeutic beams. In addition, using conventional linacs necessitates applying wedge filters in some clinical conditions. However, there is not...

Based on the wave function expansion method, dynamic antiplane characteristics of a wedge-shaped quarter-space containing circular hole are studied in complex coordinate system. The medium is decomposed into two subregions along virtual boundary using region decomposition method. scattering field subregion I constructed by mirror and standing II fractional Bessel function. According to continui...

BACKGROUND Controversy exists over whether or not single-needle liver biopsies are sufficient to compare histological parameters in patients with non-alcoholic fatty liver disease. AIMS To identify sampling variability, we biopsied four liver specimens per patient, based on biopsy size (needle vs wedge) and location (left vs right lobe), immediately prior to bariatric Roux-en-Y gastric bypass...

An auto-ignition detonation phenomenon can be initiated by a wedge confined in a channel. A new, self-sustaining, normal detonation wave engine concept is proposed. The detonation processes were numerically modeled with a simplified two-dimensional wedged channel flow that was deemed to emulate a real three-dimensional configuration. The results showed that within certain ranges of incoming flo...