Volume control

Volume Control vs

Control of volume holograms

Received May 9, 1991; revised manuscript received February 14, 1992; accepted February 25, 1992 The mismatch in the number of degrees of freedom supported by volume holograms and the boundary fields that control them limits the dynamic range of recorded holograms. For holograms controlled by using fractal sampling grids, the maximum dynamic range falls inversely with the minimum number of expos...

Cell Volume Control

There are many organic ions inside the cell which do not leak out of the cell membrane. This creates excess osmotic pressure for the inside of the cell. Since the membrane is permeable to water and is not mechanically strong enough to withstand significant osmotic pressure differences, the cell cannot maintain its volume and will tend to burst. Depending on the organism, there are three ways to...

A comparison of volume control and pressure-regulated volume control ventilation in acute respiratory failure

BACKGROUND: The aim of this study was to test the hypothesis that a new mode of ventilation (pressure-regulated volume control; PRVC) is associated with improvements in respiratory mechanics and outcome when compared with conventional volume control (VC) ventilation in patients with acute respiratory failure. We conducted a randomised, prospective, open, cross over trial on 44 patients with acu...

Control-volume Mixed Finite Element Methods

A key ingredient in simulation of ow in porous media is accurate determination of the velocities that drive the ow. Large-scale irregularities of the geology (faults, fractures, and layers) suggest the use of irregular grids in simulation. This paper presents a control-volume mixed nite element method that provides a simple, systematic, easily implemented procedure for obtaining accurate veloci...