OBJECTIVES This study was designed to assess whether intermittent impedance of inspiratory gas exchange improves the efficiency of standard cardiopulmonary resuscitation (CPR). BACKGROUND Standard CPR relies on the natural elastic recoil of the chest to transiently decrease intrathoracic pressures and thereby promote venous blood return to the heart. To further enhance the negative intrathora...

This paper proposes a method for quantitative integration of seismic (elastic) anisotropy attributes with reservoir performance data as an aid in characterization of systems of natural fractures in hydrocarbon reservoirs. This method is demonstrated through application to history matching of reservoir performance using synthetic test cases. Discrete Feature Network (DFN) modeling (Dershowitz et...

O'Rourke MF, Taylor MG (1966) Vascular impedance of the femoral bed. Circ Res 18: 126-139 O'Rourke MF, Tavlor MG (1967) Input impedance of systemic circulation. CircRes 20: 365-380 O'Rourke MF, Blazek JV, Morrells CL Jr, Krovetz LJ (1968) Pressure wave transmission along the human aorta. Changes with age and in arterial degenerative disease. Circ Res 23: 567-579 Patel DJ, Greenfield JC Jr, Aust...

The Tanita body-fat analyser is a novel device to estimate body fat, based on the principles of bioelectrical impedance. It differs from other impedance systems which use surface electrodes in that the subjects stand bare-footed on a metal sole-plate which incorporates the electrodes, hence impedance is measured through the legs and lower trunk. In 104 men and 101 women (16-78 years and BMI 16-...

In this paper, we investigate the existence and characterizations of the Fréchet derivatives of the solution to time-harmonic elastic scattering problems with respect to the boundary of the obstacle. Our analysis is based on a technique the factorization of the difference of the far-field pattern for two different scatterers introduced by Kress and Païvarinta to establish Fréchet differentiabil...

Most of those techniques used for the measurement of elastic coefficients for bulk piezoelectric ceramics are not applicable to films deposited on thick substrates because the measured properties, such as the resonant frequency, are usually dominated by the presence of the thick substrate. This work presents a preliminary study for the application of Alemany et al. automatic iterative method fo...

Within the framework of the development of a wearable communications system for a sportsman, a textile antenna has been realised. The required antenna needed to be low profile, washable, insensitive to the proximity of the human skin and relatively insensitive to deformation. To overcome the human operator coupling effects on the antenna input impedance, i.e. a shift in resonance frequency and ...

The importance of force sensitivity in robots that interact with unknown disturbance is acknowledged. For the manipulators, impedance controlled robots realized safe and robust object manipulation. For the legged mechanism, it is expected to enhance locomotion stability, since locomotion fundamentally is a manipulation of the center of mass. In order to maximize force sensitivity, both the forc...

Alginate beads are one of the most common vehicles for encapsulation. When designing bioartificial organs, they are used as matrix for cell culture. Cell survival and activity depend essentially on the bead physical and mechanical properties. Our objective is to study the feasibility of evaluating mechanical properties of millimetric beads using an ultrasound technique. We show that Lamé’s firs...