We derive a novel finite volume method for the elliptic equation, using the framework of mixed finite element methods to discretize the pressure and velocities on two different grids (covolumes), triangular (tetrahedral) mesh and control volume mesh. The new discretization is defined for tensor diffusion coefficient and well suited for heterogeneous media. When the control volumes are created b...

Numerical grid adaptation method for finite volume methods is presented. Unlike traditional adaptation methods, the method presented moves vertices of control volumes instead of their centers. To perform such movement, geometric information is used generated for the control volume method. The presented method can be used for twoand three-dimensional grids of arbitrary structure. Possibilities a...

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...

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...