Concept

Pouls

Publications associées (117)

Synthesis of superposition images for watches, valuable articles and publicity

The present invention aims at synthesizing superposition images formed either by band moire shapes or by shape level lines for making the information forwarded by valuable articles or by time pieces such as watches and clocks more dynamic, as well as for i ...

2007

Effects of an aging vascular model on healthy and diseased hearts

Nikolaos Stergiopoulos, Rafaela Fernandes Da Silva, David Jegger, Patrick Segers

The vitamin D(3) and nicotine (VDN) model is a model of isolated systolic hypertension (ISH) due to arterial calcification raising arterial stiffness and vascular impedance similar to an aged and stiffened arterial tree. We therefore analyzed the impact of ...

2007

Pressure injection in continuous sample flow electrophoresis microchips

Martinus Gijs, Frédéric Lacharme

Pressure pulse injection is proposed as an alternative technique to electrokinetic injection for use in continuous sample flow electrophoresis microchips. During chip operation, sample and buffer solutions are electrokinetically driven near to the entrance ...

2006

Arterial pressure transfer characteristics: effects of travel time

Nikolaos Stergiopoulos, Nico Westerhof

We investigated the quantitative contribution of all local conduit arterial, blood, and distal load properties to the pressure transfer function from brachial artery to aorta. The model was based on anatomical data, Young's modulus, wall viscosity, blood v ...

2006

Analysis of electrocardiograms during atrial fibrillation

Jean-Marc Vesin, Vincent Jacquemet, Lukas Kappenberger

The research discussed in this article is motivated by the search for an optimal classification of the different types of atrial fibrillation (AF) on the basis of recorded atrial signals. This would facilitate the selection of an optimal therapy. This arti ...

2006

Effect of intimal shear and cyclic strech on arterial segments perfused in vitro

Veronica Gambillara

Hemodynamics have crucial role in the control of vascular tone, in the regulation of arterial remodeling, and in the production of mediators that maintain arterial function. Changes in hemodynamics forces induce profound alterations in vascular cell metabo ...

EPFL2005

An ultrasound-based method for determining pulse wave velocity in superficial arteries

Nikolaos Stergiopoulos

In this paper, we present a method for estimating local pulse wave velocity (PWV) solely from ultrasound measurements: the area-flow (QA) method. With the QA method, PWV is estimated as the ratio between change in flow and change in cross-sectional area (P ...

2004

Conductance catheter-based assessment of arterial input impedance, arterial function, and ventricular-vascular interaction in mice

Nikolaos Stergiopoulos, Patrick Segers, Nico Westerhof

Global assessment of both cardiac and arterial function is important for a meaningful interpretation of pathophysiological changes in animal models of cardiovascular disease. We simultaneously acquired left ventricular (LV) and aortic pressure and LV volum ...

2004

Ca2+ dynamics in a population of smooth muscle cells: modeling the recruitment and synchronization

Jean-Jacques Meister, Roger Sauser, Jean-Louis Bény, Michèle Koenigsberger, Mathieu Lamboley

Many experimental studies have shown that arterial smooth muscle cells respond with cytosolic calcium rises to vasoconstrictor stimulation. A low vasoconstrictor concentration gives rise to asynchronous spikes in the calcium concentration in a few cells (a ...

Elsevier2004

Reverse propagation of femtosecond pulses in optical fibers

Demetri Psaltis

We present a numerical technique for reversing femtosecond pulse propagation in an optical fiber, such that given any output pulse it is possible to obtain the input pulse shape by numerically undoing all dispersion and nonlinear effects. The technique is ...

2003

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