Abstract The Richards’ equation describes the flow phenomenon in unsaturated porous media and is essential to hydrology environmental science. This study evaluated numerical stability of two different forms equation. Sensitivity analyses were performed investigate control parameters results show that h -form has better applicability for calculating variable saturation flows than θ For equation,...

Affected by climatic conditions such as rainfall, evaporation and air temperature, most of the backfill soil is in an unsaturated state, decrease matric suction leads to failure retaining structure. In view this, this study takes vertical rigid wall with narrow research object, assuming that behind forms a circular arch considering interlayer shear stress; thus, analytical solution active earth...

Many surgical teams employ a sump pump to vent the left ventricle (LV). The problems associated with this technique are related to safety and convenience. If the flow is accidentally reversed in the LV vent line, air embolism accidents and subsequent litigation may be the result. If the cannula is occluded, it is inconvenient to juggle pump speed to prevent the line from collapsing while mainta...

Although neck suction has been widely used in the evaluation of carotid sinus baroreflex function in humans, counteraction of the aortic baroreflex tends to complicate any interpretation of observed arterial pressure (AP) response. To determine whether a simple linear model can account for the AP response during neck suction, we developed an animal model of the neck suction procedure in which c...

The magnitude of sub-ambient pressure inside the bucco-pharyngeal cavity of aquatic animals is generally considered a valuable metric of suction feeding performance. However, these pressures do not provide a direct indication of the effect of the suction act on the movement of the prey item. Especially when comparing suction performance of animals with differences in the shape of the expanding ...

BACKGROUND Atelectasis occurs after a well performed endotracheal suction. Clinical studies have shown that recruitment manoeuvres added after endotracheal suction during mechanical ventilation restore lung function. Repetitive lung over-distension is, however, harmful for the lung, and the effects of adding a larger breath, recruitment breath, directly after repeated endotracheal suction were ...

The aim of the current study was to investigate the differential effects of endotracheal suction on respiratory mechanics and gas exchange in patients with severe sepsis using pressure-controlled ventilation (PCV) and volume-controlled ventilation (VCV). We prospectively included 76 patients with severe sepsis receiving mechanical ventilation due to acute respiratory failure (ARF). The effects ...

Abstract Infiltration into soil slopes is a fundamental concern in civil engineering. Rainfall infiltration leads to changes pore-water pressure and reduces matric suction soils, making it one of the main triggers slope failure (Ali et al. Comput Geotech 61:341–354, 2014; Wu Hydro-mechanical analysis rainfall-induced landslides. Springer, 2020). Slope instabilities caused by water are called la...

TO THE EDITOR: Zhang et al. (6) elegantly discuss the concept of diastasis (static equilibrium volume) and diastolic suction and address the idea that diastasis provides a measure of ventricular equilibrium. While this definition provides a very useful working model, one must also consider differences between early diastolic filling and diastolic suction when examining ventricular function. Ina...