Associate Professor, Graduate Aeronautical laboratories, California Institute of Technology, Pasadena, Calif. The tip velocity of a crack propagating through a vi scoelastic material depends on geometry, apptied toad and its history , and material properties. A consideration of the work done by the unloading tractions at the crack tip shows that, f or a large crack propagating throitgh an infin...

A systematic fluid theory of nonlinear magnetic island dynamics in conventional low, large aspect-ratio, circular cross-section tokamak plasmas is developed using an extended magnetohydrodynamics model that incorporates diamagnetic flows, ion gyroviscosity, fast parallel electron heat transport, the ion sound wave, the drift wave, and average magnetic field-line curvature. The model excludes th...

Mallory-Weiss tearing (MWT) is a common cause of non-variceal upper gastrointestinal bleeding. Although the majority of patients with bleeding MWT require no intervention other than hemodynamic supports, spectrum of MWT is wide, and the condition sometimes results in a fatal outcome. Endoscopic management to stop the bleeding may be required during the index endoscopy, especially in those with ...

1. Introduction. The standard theory of the tearing-mode evolution identifies three stages. The first is the linear stage described by the Furth–Killeen–Rosenbluth (FKR) theory [1]. During this stage, the island width W grows exponentially in time until it reaches the width of the resistive dissipation layer, ℓ η ∝ η 2/5 ∆ ′1/5 , where η is the resistivity and ∆ ′ is the instability parameter [...

A modified sum-rates method based on insights provided by an analysis given by Sridhar and Lucia (Ind. Engng Chem. Res. 28, 793-803, 1989) is presented. Newton’s method is used to accelerate the inner loop of combined mass balance and phase equilibrium equations and to solve the outer loop of energy balance equations. All partial derivative information is obtained in analytical form. Several li...

Background—Transluminal balloon tearing of the membrane in a thin discrete subaortic stenosis is an alternative to membrane surgical resection. However, the long-term outcome of patients with isolated thin discrete subaortic stenosis treated by transluminal balloon tearing remains unknown. Methods and Results—This 25-year study describes findings from 76 patients with isolated thin discrete sub...