Failure of rock mass in deep underground excavations could be attributed to a broad range performance malfunction, from plastic yielding rock, generation macro cracks on the boundary excavation, gravity driven rockfalls or even complete stress-induced collapse. The failure criteria determine stress level (or strain level) at which loses its load-carrying strain-carrying) capacity. Determination...

In this work, some solutions such as Mori-Tanaka approximation (MTA), Differential approximations (DA), and Fast Fourier transformation method (FFT) were applied to estimate the elastic bulk shear modulus of three-phase composites in 2D. which two different sizes circular inclusions are arranged randomly non-overlapping a continuous matrix. The numerical using FFT analysis compared with DA, MTA...

BACKGROUND To investigate the prevalence of cumulative organ damage among Egyptian children with juvenile-onset systemic lupus erythematosus (jSLE) and the relationships between the organ damage and the demographic data, clinical variables, and disease activity. METHODS A total of 148 patients with jSLE have been followed in the pediatric rheumatology clinic and section at Cairo University. T...