A toy model for the Blandford-Znajek mechanism is investigated: a Kerr black hole with a toroidal electric current residing in a thin disk around the black hole in the equatorial plane. The toroidal electric current generates a poloidal magnetic field threading the black hole and disk. The rotation of the black hole and disk relative to the magnetic field induces an electromotive force, which c...

Abstract

We report a case of spontaneous closure of stage-II macular hole. A 66 years old lady presented with decreased vision in her left eye for the last 3 months. Her vision was 6/18 in right eye and finger counting at 3 feet in left eye. Optical coherence tomography showed stage-II macular hole in left eye. There was attachment of vitreous at the edge of the hole. Minimal hole diameter was 119 μ. Ma...

Each of two parts has K coordination holes with the intent that each hole on onepart is paired and to be pinned with a corresponding hole on the other part. Whilethe nominal hole centers for each hole pair are identical, the actual hole centers willdeviate from their nominal values in some random fashion reflecting the inherent holecentering accuracy of the drilling process....

We propose and demonstrate the sequential initialization, optical control, and readout of a single spin trapped in a semiconductor quantum dot. Hole spin preparation is achieved through ionization of a resonantly excited electron-hole pair. Optical control is observed as a coherent Rabi rotation between the hole and charged-exciton states, which is conditional on the initial hole spin state. Th...

Purpose: The first step to manage motor impairment of upper limb in patients with subacute stroke is having an accurate assessment tool. The Fugl-Meyer assessment of upper extremity and 9-hole pegboard test are used to evaluate motor function and hand dexterity in stroke survivals. The present study aimed to investigate the test-retest reliability and minimal detectable change (MDC) in these tw...

In this article, we report the studies of various device architectures of organic lightemitting devices (OLEDs) incorporating highly efficient blue-emitting and ambipolar carriertransport ter(9,9-diarylfluorene)s, and their influences on device characteristics. The device structures investigated include single-layer devices and multilayer heterostructure devices employing the terfluorene as one...

Drilling and blasting have numerous applications in the civil and mining engineering. Due to the two major components of rock masses, namely the intact rock matrix and the discontinuities, their behavior is a complicated process to be analyzed. The purpose of this work is to investigate the effects of the geomechanical and geometrical parameters of rock and discontinuities on the rock mass blas...

Recent developments on the automation of the X-rays approach to hole-cutting in overset grids is further improved. A fast method to compute an auxiliary wall-distance function used in providing a first estimate of the hole boundary location is introduced. Subsequent iterations lead to automatically-created hole boundaries with a spatially-variable offset from the minimum hole. For each hole bou...