а это означает, что

А это значит / означает, что -- which means that; this would imply that; as such (а если это так, то)

 These cracks can be seen without magnification at strains near 1 percent which means that the crack nucleation has commenced at somewhat lower strain level.

 This would imply that a peak in unsteadiness behavior must occur at some critical D.

 It is assumed that heat transfer between the fluid and matrix is by convection only. As such, heat conduction in both the fluids and matrix is assumed to be negligible.