Background Aortic blood flow in healthy people is characterised by helical flow in the ascending and descending aorta, with corresponding patterns of wall shear stress (WSS) imposed upon the wall of the aorta by moving blood. Flow and WSS patterns in the aortic root and sinuses of Valsalva, and the flow patterns in diseased aortas are incompletely defined. We describe the use of a validated, ti...

This study focuses on the dynamic flow through the fetal aortic arch driven by the concurrent action of right and left ventricles. We created a parametric pulsatile computational fluid dynamics (CFD) model of the fetal aortic junction with physiologic vessel geometries. To gain a better biophysical understanding, an in vitro experimental fetal flow loop for flow visualization was constructed fo...

Spatial frequency tuning functions were measured for direction discrimination of optic flow patterns. Three subjects discriminated the direction of a curved motion path using computer generated optic flow patterns composed of randomly positioned dots. Performance was measured with unfiltered patterns and with patterns that were spatially filtered across a range of spatial frequencies (center sp...

OBJECTIVES Languages used to specify computer-interpretable guidelines (CIGs) differ in their approaches to addressing particular modeling challenges. The main goals of this article are: (1) to examine the expressive power of CIG modeling languages, and (2) to define the differences, from the control-flow perspective, between process languages in workflow management systems and modeling languag...

This note presents a simple method to control the speed of the autonomous capillary flow using an array of hydrophobic patterns. The microfluidic system in this note was composed of two planar parallel plates that were separated by spacers. The bottom plate had a hydrophilic microchannel which was surrounded by hydrophobic tracks. The top surface was relatively hydrophobic compared to the botto...

In this paper, we present the observation of light-induced selfsynchronizing flow patterns in a light–fluid system. A light beam induces local flow patterns in a fluid, which oscillate periodically or chaotically in time. The oscillations within different regions of the fluid interact with each other through heatand surface-tension-induced fluid waves, and they become synchronized. We demonstra...

Recently, mashup tools have emerged as popular end-user development platform. Composition languages used in mashup tools provide ways (drag-and-drop based visual metaphor for programming) to integrate data from multiple data sources in order to develop situational applications. However this integration task often requires substantial technical expertise from the developers in order to use basic...

View NONINVASIVE IMAGING OF INDEPENDENT CORTICAL FLOW PATTERNS. While independent component analysis (ICA) is useful for modeling brain and electroencephalographic (EEG) data, current ICA methods for EEG model signal sources as acting in perfect synchrony within spatially fixed domains. In contrast, invasive animal recordings have observed waves of neuronal activity propagating quickly across m...

We are interested in the development of an efficient computational visual system to study dynamic fluids. So, in this paper, we present a methodology to detect patterns in flow-like images. These patterns are called, in the Dynamical Systems theory, critical points or single points. This method involves four steps: estimation of flow directions; matching; critical point confirmation, and critic...