...In previous versions, only a single (average) pore size was used
to describe laminated and vuggy porous media in the nuclear
micro-geophysical modeling program LVPM. Recently, Doctor
Neutron succeeded in incorporating FRACTAL DIMENSION
into this program: pores are now permitted to have radii
distributed from a maximum value (Rmax) down to a minimum
value (Rmin), with a self-similar pore size distribution governed
by a single fractal dimension (D).

This new development permits contact with many new and
exciting developments in reservoir studies. See the section
labelled "FRACTALS" for the details!...

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Periodically this site will present fresh new examples with
LVPM concerning the impact of pore size and laminae properties
on bulk density, Pe, dual-spaced neutron porosity, thermal
neutron diffusion coefficient, and neutron capture cross section.

In particular, the density and Pe computations no longer utilize
Filippov's method. Instead, a new and very accurate
interpolation scheme based more directly on the NIST data tables
of Hubbell and Seltzer is used. As in the previous Filippov
formulation, the new LVPM calculations still account for energy
losses during gamma ray propagation, corrections for multiple
scatterings, and the gamma detector energy-dependent counting
efficiency.

One new feature has been added to the LVPM Program Internals
Output Pane: Material 1 and Material 2 MCNP5 Mass Fractions.