One of the methods used to investigate the damaged zone in rock structure is the acoustic emission method. This method is based on receiving the elastic waves that are produced by deformation and cracking of the rock mass around the underground excavation. In this research, a study is conducted on the rock samples by a numerical method to investigate the damaged zone caused by the excavat...

Orbital eccentricity is one of the most robust discriminators for distinguishing between dynamical and isolated formation scenarios binary black hole mergers using gravitational-wave observatories such as LIGO Virgo. Using state-of-the-art cluster models, we show how selection effects impact detectable distribution eccentric from clusters. We that observation (or lack thereof) can significantly...

High birefringence induced by elliptical air hole photonic crystal fibers (EHPCFs) is analyzed numerically using the finite-element method. Statistical correlations between the birefringence and the various parameters are obtained. We found that the complex elliptical air hole is better than that of a circular one to obtain high birefringence in photonic crystal fibers. Our suggested structures...

We solve the equations of two-dimensional hydrodynamics describing a circumbinary disk accreting onto an eccentric, equal-mass binary. compute time rate change binary semimajor axis $a$ and eccentricity $e$ over continuous range eccentricities spanning $e=0$ to $e=0.9$. find that binaries with initial $e_0 \lesssim 0.1$ tend $e=0$, where expands. All others are attracted $e \approx 0.4$, decays...

INTRODUCTION Vitreomacular traction syndrome has recently been recognized as a distinct clinical condition. It may lead to many complications, such as cystoid macular edema, macular pucker formation, tractional macular detachment, and full-thickness macular hole formation. CASE PRESENTATION We report a case of vitreomacular traction syndrome with eccentric traction at the macula and a partial...

It is well known that a circular hole in a blanket thin film causes strain concentration near the hole edge when the thin film is under tension. The increased strain level can be as high as three times of the applied tension. Interestingly, we show that, by suitably patterning an array of circular holes in a thin film, the resulting strain in the patterned film can be decreased to only a fracti...

We suggest that a neutron star with a strong magnetic field, spiraling into the envelope of a companion star, can generate a “companion induced SN-like off-center explosion”. The strongly magnetized neutron star (“magnetar”) is born in a supernova explosion before entering into an expanding envelope of a supergiant companion. If the neutron star collapses into a black hole via the hypercritical...