Effect of single channels and slits on reactivity

The change in reactivity due to the change in transport cross section in an inclusion in the form of a cylinder or a plain layer is expressed as a perturbation of the neutron ftux at some distance from the inclusion, where the diffusion approximation holds. By using the results of flux calculations in the layer mediunh and in the cylinder, a relation may be found between the change in reactivity and the characteristics of the inclusion (such as transport cross section, volume, shape, where it is located, etc.). The effect of shape shows up in the coefficients B and B being different from unity. These same coefficients are what determine the average diffusion coefficients D and D, An interpolation formula is constructed for B based on the various limiting expressions.Translated from Atomnaya Énergiya, Vol. 14, No. 4, pp. 364–370, April, 1963.     

Examination of the defective structure of tungsten powers by the electron-positron annihilation method

Powder Metallurgy and Metal Ceramics -     

Experience from using AV-17-8 anionite in mixed-bed filters

Results of experimental studies of operation of AV-17-8 anionite with advanced kinetic properties under conditions of operation in mixed-bed filters at ammonia-production plants are presented and compared with those for ordinary anionite. A comparison of their operation indexes is given.