PURPOSE Following repair of coarctation of the aorta (CoA), LV mass is increased along with morbidity and mortality. Previous studies have reported increased shortening indices and impaired diastolic function. However, direct measurements of local material motion and temporal evolution of strain have been lacking. METHODS Magnetic resonance (MR) tissue tagging was used to quantify regional th...

Laser tube bending is a flexible forming process. Two irradiation methods of axial and circumferential scanning are generally used to form metal tubes. The two most important disadvantages of circumferential scanning are its lower bending angle and the time interval required between each scan for cooling purpose. In this research, a novel cooling strategy during laser tube bending with circumfe...

Cardiac catheterization data on 39 patients was classified in 5 cardiovascular groups: normal, compensated volume overload, decompensated volume overload, compensated pressure overload, and congestive cardiomyopathy. Both the Lagrangian stress and contractile filament stress for the circumferential axis and the longitudinal axis were computed over a complete cardiac cycle. Contractile filament ...

OBJECTIVES We aimed to study the relation between onset and peak time of circumferential shortening and the direction of propagation of these parameters in both ischemic and nonischemic patients. BACKGROUND Peak time is often used to select patients for cardiac resynchronization therapy, whereas pacing influences only the onset times directly. Furthermore, it is unclear whether there is a consi...

Ultrasonic fiber optic sensors (UFOS) based on Mach-Zehnder (M-Z) interferometer is proposed to detect guided waves propagating in the pipe, which is common structural component in aerospace, mechanical or civil structures. The sensitivity of UFOS depends on the long sensing distance, while winding around the circumferential direction of the pipe provides arbitrary sensing length as well as sma...

In this paper, simulation and analysis of thin steel cylindrical shells with elliptical cutouts under oblique loading were studied using finite element method. First, the numerical results were validated by the results of experimental test performed by an INSTRON 8802 servo hydraulic machine. Also, the effect of cutout angle (θ), cutout size, cutout position (L0/L) and cutout aspect ratios (b/a...

Abstract The propagation characteristics of SH waves along the circumferential direction in an orthotropic layer/piezoelectric column structure with a non-ideal interface are studied this paper. By solving governing equations, solutions to problem expressed by first and second Bessel functions. dispersion equation is obtained boundary conditions conditions. numerical examples provided show effe...

Abstract A numerically efficient, semi‐analytical solution of the Reynolds equation for hydrodynamic journal bearings is developed based on Scaled Boundary Finite Element Method. The pressure field discretized along circumferential coordinate lubrication gap, while an analytical formulation used in axial direction. system inhomogeneous ordinary differential equations obtained, which solved unde...

It is necessary to reduce fretting wear of railway axle journal bearings caused by very slight relative slips between the contact surfaces inner ring and backing ring. This paper proposes a with grooves in circumferential direction on its oil seal sliding surface obtain even pressure distributions radial them. Results rotation test full‐scale bearing using proposed showed that this proposal eff...

(Received 26 February 1984; accepted for publication 20 November 1984) A theoretical nalysis ofsound propagation in cylindrical ducts lined with porous material {bulk absorbers) is presented. Three configurations are discussed. (1) The porous material is homogeneous; thenthe sound field is built up of modes. (2) The properties of the liner vary slowly in an axial direction. A pure modal solutio...