this study investigates propagation of mode i crack in b70 pre-stressed concrete sleepers by fracture mechanics approach. a new experimental analysis is done for notched b70 pre-stressed concrete sleepers with replica test and image analysis. a scanning electron microscope test (sem) and an image analysis are applied for the replica test in order to determine crack length and crack mouth openin...

To investigate the effect of fluoride and silver nanoparticles on prevention in vitro demineralization sound enamel caries-like lesions varying severities. Caries-like different severities (1/6/15 days) were created bovine specimens. One group remained sound. All specimens demineralized again using a partially saturated acetic acid solution. Mimicking intra-oral retention vitro, this solution w...

Diffuse thickening of glomerular basement membranes (GBM) was optically observed in the renal grafts of 15 patients (21 specimens) among 70 recipients (128 specimens). Most of these specimens with diffuse GBM thickening were examined ultrastructurally. All cases with the above change were only found in allografts. The correlation was observed between the degree of GBM thickening and the clinica...