Background: Human essential hypertension has a genetic basis, and hypertension is associated with altered endothelial nitric oxide (NO) release. We hypothesized that functional alterations of the endothelium-derived NO pathway in the presence of the 894G>T polymorphism of the endothelial NO synthase (eNOS) gene may be related to circadian variation of blood pressure in patients with essential h...

Structural Health Monitoring System for Deepwater Risers with Vortex-induced Vibration: Nonlinear Modeling, Blind Identification Fatigue/Damage Estimation and Local Monitoring using Magnetic Flux Leakage

The vortex-induced vibration (VIV) of flexible risers is a complex fluid–structure interaction (FSI) phenomenon. In this study, we conducted numerical simulation method based on the slicing to study deep-sea with different slenderness ratios and uniform flow velocities. combines finite element model riser structure two-dimensional field slices solved by Fluent solver. was realized self-compiled...

The effect of lingual surface inclination of the maxillary canine on the jaw muscle activity was investigated on five subjects. Several different metal maxillary canine risers were fabricated to change the lingual inclination. The EMG activity of the masseter and posterior temporal muscle was recorded bilaterally by means of bipolar surface electrodes simultaneously with the LED mandibular trac...

An abnormal dipping pattern in ambulatory blood pressure monitoring (ABPM) is a cardiovascular (CV) risk factor. However, its impact on CV mortality has not been investigated sufficiently in clinical practice to be considered a standard parameter. We assessed the association between abnormal dipping patterns and increased CV mortality in a tertiary hospital in Korea. Our retrospective cohort st...

Abstract The flow field induced by internal solitary waves (ISWs) is peculiar wherein water motion occurs in the whole depth, and strong shear near pycnocline can be generated due to opposite direction between upper lower layers, which a potential threat marine risers. In this paper, of ISWs obtained with Korteweg-de Vries (KdV) equation for two-layer fluid system. Then, linear analysis perform...

The paper focuses on the modelling of multiphase flows in larger diameter risers of six inches and greater. The general aspects of the modelling of these flows are discussed before reviewing the current commercially available tools. Two examples are presented to illustrate the predictive capabilities of these codes. The central thrust of the paper is to consider the accuracy of the established ...

To meet the requirements of riser safety monitoring in offshore oil fields, a new Fiber Bragg Grating (FBG)-based bundle-structure riser stress monitoring sensor has been developed. In cooperation with many departments, a 49-day marine test in water depths of 1365 m and 1252 m was completed on the "HYSY-981" ocean oil drilling platform. No welding and pasting were used when the sensor was insta...

Mooring and flow lines involved in offshore systems for oil production are submitted to various solicitations. Among them the effects of current are dominating. Vortex-Induced Vibrations (VIV) and Wake-Induced Oscillations (WIO) on closely spaced marine risers may lead to fatigue, clashes and structural failures. Extended studies have been conducted to describe and explain them for spring mount...