Following routine coronary arteriography, surface irregularities and thrombogenesis of the inner and outer wall of six Ducor polyurethane and six RPX polyethylene coronary catheters were studied by scanning electron microscopy. Polyurethane catheters had rough and highly irregular external and internal surfaces. All catheters showed adherent thrombi on their external surface. The internal surf...

BACKGROUND Measurement of surface roughness irregularities that result from various sources such as manufacturing processes, surface damage, and corrosion, is an important indicator of product quality for many nondestructive testing (NDT) industries. Many techniques exist, however because of their qualitative, time-consuming and direct-contact modes, it is of some importance to work out new exp...

Abstract The author proposes a multi-axis equivalent mechanical system with two degrees of freedom on the horizontal plane and five along vertical axis to evaluate accelerations motorbike’s seat using state- space representation. experimental investigations three types routes analyze comfort vibrational motorcycle: paved roads poor maintenance, road surface crushed stone, an artificial bump. Ex...

In the process of car body design, various surfaces can be generated,from the given boundary curves. Depending tqon the method qf the surface generation and the qualip qf the boundary curves provided, the resulting surfaces may have global 07” local irregularities in many cases. Thus it would be necessarvfor the designer to evaluate the surface quality and to rnodifi the surface or to use the d...

CFD simulations are carried out in arterial stenoses with 48 % areal occlusion. Non-newtonian fluid model is selected for the blood flow as the same problem has been solved before with Newtonian fluid model. Studies on flow resistance with the presence of surface irregularities are carried out. Investigations are also performed on the pressure drop at various Reynolds numbers. The present study...

Standard ultrasound has a poor accuracy in the detection of carotid plaque surface irregularities and ulcers, which are features of vulnerable lesions. Sonographic contrast agents can improve vessel wall lumen definition, thus potentially overcoming this limitation. Recent studies also suggest that contrast ultrasound can be used to study intraplaque neovascularizaion, a potential marker of hig...

BACKGROUND Filler materials are gaining popularity in nonsurgical rhinoplasty the major advantages are the ability to camouflage the surface deformities, and also the soft and malleable consistency while the major drawback of the safe fillers such as hyaluronic acid is short durability. In this study, we evaluated the injectable cartilage shaving as an autologous filler material for correction...