Although, the two group neutron diffusion equations do not give a detailed explanation of neutron flux distribution in a practical nuclear reactor core, the four-group neutron diffusion equations are known to give a far better description of neutron distribution in a practical nuclear reactor core.

To calculate the four-group diffusion equation, we use the finite difference discretization of steady state four-group neutron diffusion equation in a cylindrical coordinate.

(4) was discretized using a finite difference method to obtain the four-group diffusion equations by considering the neutron flux varying along the radial and axial coordinate, hence the Fick's law for the radial and axial coordinate can be written as Eqs.

The finite difference equation for the four-group diffusion equations in a cylindrical geometry can be obtained from Eq.

The TUNTOB algorithm was developed for the criticality calculations of a homogenous cylindrical reactor core using four-group diffusion equations.

A total of 16 teams will play in a

four-group futsal knockout competition, and -- for the first time -- four junior sides will compete in a head-to-head format, making a total of 35 matches.

Muscat, Shawwal 17, 1434, Aug 24, 2013, SPA -- Lots drawn today in the Omani capital of Muscat to name the teams of the

four-group Asia soccer cup finals under 22 to be hosted by Oman in January 2014 placed Saudi Arabia in group D with Uzbekistan, China and Iraq.

For instance, the total area of dots in each group and the total length of the borders around each group's dots was the same in the two-group and

four-group conditions.

Maintaining the general structure of the RUG III system, the proposed refinement adds 14 new RUG groups (for a total of 58) as well as a

four-group medical ancillary index (MAI) to better account for the wide variation in non-therapy ancillary costs across RUG groups.

* A

four-group taxonomy emerges from the analysis., including a low integration/low responsiveness classification.