Rock anisotropy plays an important role in engineering behavior of rocks. Slates are anisotropic rocks which have long been used for gable roof, floor tiles, borrow materials, and other purposes. The slates studied in this research are calcareous and have a porphyro-lepidoblastic texture. To determine the role of the anisotropy on the tensile strength and fracture pattern, two variables includi...

Ultrasonic guided waves have recently been used in fracture evaluation and fracture healing monitoring. An axial transmission technique has been used to quantify the impact of the gap breakage width and fracture angle on the amplitudes of low order guided wave modes S0 and A0 under a 100 kHz narrowband excitation. In our two dimensional finite-difference time-domain (2D-FDTD) simulation, the lo...

OBJECTIVE To evaluate the effect of number of uses, angle and radius of curvature and type of instrument on the fracture of ProTaper rotary instruments when used by undergraduate students. STUDY DESIGN Three hundred and seventy-six molars, with a total of 1114 root canals, extracted were instrumented by undergraduate students using ProTaper instruments according to the manufacturer´s recommen...

BACKGROUND There is increasing evidence associating "atypical" femoral fractures with prolonged exposure to bisphosphonate therapy. The cause of these fractures is unknown and likely multifactorial. This study evaluated the hypothesis that patients with primary osteoporosis who sustain atypical femoral fracture(s) while on chronic bisphosphonate therapy have a more varus proximal femoral geomet...

S U M M A R Y We derive the explicit expressions for the phase velocities and polarizations of quasi-shear waves propagating in a transversely isotropic medium. The normal to the plane defined by the phase normal and the symmetry axis gives the exact polarization of S1, while the polarization of S2 also depends on the elastic parameters of the medium and is thus more complicated. Therefore, we ...

The records of multiple Love and Rayleigh waves of the Alaska earthquake of 1964 were recovered from the 30-100 seismograph records at the WWSSN stations. The seismograms were equalized to a propagation distance of 9rr/2 (equivalent to G5 and R5 at • -r/2). These seismograms were compared with synthetic seismograms for radiation pattern and amplitude to estimate various source parameters. The s...

Gas hydrates (GH) are well known to have an influential effect on the velocity and attenuation of gas hydrate-bearing sediments (GHBS). Based rock physics modeling, sediment has been extensively used characterize distribution hydrate. However, results obtained from different models show a significant variation. In this study, we firstly review compare existing modeling for attenuation. The assu...

Abstract The metavolcanics of Chitradurga region host numerous shallow crustal veins and fractures faults multiple orientations. Several high low P f cycles have been recorded in the region, leading to reactivation most pre-existing for selective some well-oriented under conditions. anisotropy (magnetic fabric) acted as prominent planar fabric fracture propagation vein emplacement both conditio...

BACKGROUND We conducted this radiographic study in the elderly population with proximal humeral fracture aiming to evaluate 1) the serial changes of neck-shaft angle after locking plate fixation and 2) find relationship between change in neck shaft angle and various factors such as age, fracture pattern, severity of osteoporosis, medial support and initial reduction angle. METHODS Twenty-five...

In this work composite hollow-fibers were prepared by dip-coating of commercial polypropylene (PP) with a thin layer of ethylene–chlorotrifluoroethylene copolymer (ECTFE). The employment of N-methyl pyrrolidone (NMP) as solvent improved the polymer processability favoring dip-coating at lower temperature (135 ◦C). Scanning electron microscopy (SEM) analyses showed that after dip-coating the PP ...