The spiral groove seal has a strong hydrodynamic effect, but it poor pollution resistance at the seal’s end and unfavorable sealing stability. Circumferential waviness seals can use fluid to clean surface have ability self-rush, protecting main cover from contamination. This study presents novel wave-tilt-dam design that integrates structures enhance performance of circumferential seals. object...

Chiral spoof surface plasmon polaritons in the terahertz region, resulting from a coherent superposition of TM and HE modes, can be generated by normally exciting helically corrugated metal wire with a linearly polarized Gaussian light. The handedness of the chiral SPP depends on the handedness of the helical groove. The chirality of the surface wave causes a spiral spatial extent of average po...

In this letter, we briefly describe the evolution of a variety of self-gravitating protoplanetary disk models that contain annular grooves (e.g. gaps) in their surface density. These grooves are inspired by the density gaps that are presumed to open in response to the formation of a giant planet. Our work provides an extension of the previously studied groove modes that are known in the context...

Dry gas seals are widely used in rotating equipment for fluid leakage control and operating efficiency enhancement, while the geometric parameters of spiral groove affect its sealing performance significantly. Groove width ratio δ, length α, angle β selected optimization different objectives, including opening force Fo, film stiffness kz, stiffness–leakage Γ. The genetic algorithm loop iteratio...

BACKGROUND Peripheral nerve injury and brachial plexopathy are known, though rare complications of coronary artery surgery. The ulnar nerve is most frequently affected, whereas radial nerve lesions are much less common accounting for only 3% of such intraoperative injuries. CASE PRESENTATIONS Two 52- and 50-year-old men underwent coronary artery surgery. On the first postoperative day they bo...

Nifekalant (NF) is a novel class III antiarrhythmic agent that is effective in preventing recurrent life-threatening ventricular tachycardia/fibrillation (VT/VF). However, because the mechanism underlying the antiarrhythmic action of NF is unknown, we investigated the effects of NF on the dynamics of functional reentry in rabbit hearts. A 2D subepicardial myocardial layer was prepared in 21 Lan...