The example in figure 5 is a set of electron images which show a uraninite crystal, partially pseudomorphized by carbonates, and a long microfissure
crosscutting the rock matrix from the source term to a small area where U-silicates have been precipitated.
We still get some microfissure
cracks, but well within the weld area--not way outside the fusion zone.
The 68 cm/yr (27 in/yr) reported using tritium in a Dorset chalk (5) and the 54 cm/yr (21 in/yr) reported in the Cambridgeshire chalk (12) are related to microfissure
flow within the chalk.
Thus, Michele Rivasi (Greens-EFA, France) says: "Let's not forget that these stress tests were only carried out a minima and that they were not enough to detect the microfissures
on Belgian reactor vessels".
HPV infects the actively dividing squamous cells of the basal layer when introduced through microfissures
of the skin, or in naturally accessible areas like the cervical or anal transformation zones.
The internal stress of these repeated expansions and contractions results in microfissures
within the stone which serve as channels for water migration and its corrosive effects," wrote A.
In conifers, impact brittleness is attributed to anatomical factors characteristic of earlywood; in fact, when wood is subjected to impact, it undergoes a local deformation at the point of contact, giving rise to microfissures
which do not propagate easily due to the differences in the nature of its anatomical elements.
Since then, various anatomic studies have been performed on temporal bones, and theories have arisen about the significance of microfissures
in the otic capsule in the area of the oval window, the round window niche, and the posterior canal ampulla.
It chaps it, encourages microfissures
, and worsens eczema," he said.
The ChronoFlex[R] family of medical-grade segmented polyurethane elastomers has been developed specifically to overcome biologically induced microfissures
in the material, which often led to catastrophic failure in long-term implanted devices such as pacemaker leads.
These are found in dolomite vugs and microfissures
reminiscent of the Alpine type (Laforet et al.
Another benefit of the material is a low coefficient of thermal expansion, which eliminates plastic microfissures
caused by differential contraction on cooling.