BACKGROUND AND IMPORTANCE Hemodynamics play an important role in the mechanisms of aneurysm formation, growth, and rupture. However, little is known about the hemodynamics of rupture sites. CLINICAL PRESENTATION We incidentally acquired 3-dimensional images before and at the moment of rebleeding of a cerebral aneurysm in a patient. Comparison of these 2 images enabled precise identification o...

We measured epicardial S-T segment elevation and blood flow to the subjacent myocardium in 8-12 samples from anesthetized, open-chest dogs with coronary occlusion. The response to iv adenosine of blood flow to "ischemic" myocardium/mean aortic pressure depended on which criterion (among criteria I-V) was used to select samples as "ischemic": I—(S-T > 2 mV), 125 ± 47% increase (P < 0.08); II—(S-...

We examined the effects of dopamine (DP), dobutamine (DB), and isoproterenol (ISO) in 38 conscious dogs after coronary artery occlusion on measurements of overall left ventricular (LV) function (i.e., LV pressure, dP/dt, mean arterial pressure, and heart rate), while regional myocardial function was assessed, using an ultrasonic gauge to measure segment length (SL) in normal and ischemic areas ...

Electroosmotic flow within capillary zone electrophoresis can be altered electronically through a mechanism modeled as surface conductance. Experimentally, a small zone of conductive silver on the outer surface of the capillary is shown to permit good control of electroosmotic flow with an applied external voltage. This control is modeled as capacitance across the capillary wall and conductance...

The region of sea ice near the edge of the sea ice pack is known as the marginal ice zone (MIZ), and its dynamics are complicated by ocean wave interaction with the ice cover, strong gradients in the atmosphere and ocean and variations in sea ice rheology. This paper focuses on the role of sea ice rheology in determining the dynamics of the MIZ. Here, sea ice is treated as a granular material w...

In squeeze flow rheometry, the main problem is the boundary condition between the squeezed material and the plates. So, the crucial assumption is to know the location and the shape of the sample part where wall slip may or may not occurs. This question is investigated from experimental results. For this, squeeze flow experiments are carried out to visualize the flow pattern at the walls. Influe...

This work extends the overlay and index methods for intrinsic groundwater vulnerability, that typically involve soil surface vadose zone, to (saturated) transport. The method is “hybrid” as it combines standard with a simplified process-based approach component. For latter, we make use of concept methodologies based on geomorphological analysis, employing tools are generally implemented in Geog...