“…(15b) are summarized in Table 8. For materials such as Fe, Ni, Fe 3 O 4 and ammonia catalyst the ration may reach a value of 2 (see the data ο Hamby and Liu (1991) -Fig. The experiments performed by Hristov (1994) indicate two main facts supported by the results commented above: 1) The pressure drop required for the initial bed deformation and its transition into the regime of MSB increase parallel to field intensity.…”