INTRODUCTION AND OBJECTIVES Ventricular dynamic afterload depends on arterial viscoelastic and geometric properties. Vasoactive factors produced in the adventitia modulate arterial tone. However, it is still not known whether the adventitia is involved in determining the magnitude of the dynamic afterload. The aim of this study was to investigate the role played by the adventitia, via smooth mu...

Objectives: While it has been suggested that resistance training may have a beneficial effect on psychological health in young people, evidence supporting this assertion is limited. The primary aim of this study was to explore the effect of free weights and elastic tubing resistance training on physical selfperception in adolescents. Design: Randomized controlled trial. Method: Participants (N1...

Deterministic waveform inversion in the p ? domain permits estimation of the long-wavelength p-wave background velocity, the short-wavelength elastic parameter uctuations, and the energy source for a marine data set from the Gulf of Mexico. The forward map is a convolutional model for p-wave primaries-only seismograms of viscoelastic, layered media. Two types of inversion (output least squares ...

Porosity is one of the key parameters associated with oil reservoirs. Determination of this petrophysical parameter is an essential step in reservoir characterization. Among different linear and nonlinear prediction tools such as multi-regression and polynomial curve fitting, artificial neural network has gained the attention of researchers over the past years. In the present study, two-dimensi...

A short review of current methods for damage detection and failure prevention in complex machinery is first presented. Two main classes are identified: (a) detailed inspection through machinery strip-down and minute examination with a variety of scanning methods, and (b) in-situ health monitoring using passive and active sensors. The emergence of new in-situ sensor techniques based on the activ...

Abstract Mechanical properties of petroleum reservoirs can be determined via static techniques based on laboratory triaxial tests under reservoir conditions. Dynamic approaches represent an alternative in cases where such data are unavailable. elastic calculated using ultrasonic wave measurements the or situ well logging. Different relationships have been proposed to estimate from dynamic ones ...

In an oscillatory flow, the resistance to flow, more appropriately defined as the impedance to flow, is a function of oscillating frequency, which refers to the harmonic composition of the driving pressure wave. Flow in an elastic tube may be resisted in numerous ways such as the fluid viscosity, fluid inertia and tube elasticity. The concept of impedance arises in the dynamics of the Resistanc...