Topological crystalline insulators (TCIs) are insulating materials whose topological property relies on generic crystalline symmetries. Based on first-principles calculations, we study a three-dimensional (3D) crystal constructed by stacking two-dimensional TCI layers. Depending on the interlayer interaction, the layered crystal can realize diverse 3D topological phases characterized by two mir...

The geometric theory of the aberration sensitivity of an unstable cavity to a spatially localized intracavity phase distortion is provided. Such a localized perturbation source could be caused by a small imperfection in some intracavity mirror (such as a deformable mirror) or by a turbulence zone in the flow field of a gas-laser gain medium. This geometric theory, first developed by Anan'ev [So...

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A conical mirror was designed and used to measure simultaneously the elongational and rotational displacement of a number of markers on the growing zone of the sporangiophore of Phycomyces. The results obtained by this new optical method demonstrate that the rotational rate is roughly proportional to the elongational rate, except in the lower region of the growing zone where a significant amoun...

CP Ti was mirror-polished and then abraded with waterproof SiC papers of two different grit sizes: 16 and 3 microm. As-polished and abraded surfaces were characterized by means of EPMA, XPS, XRD, and hardness test. Oxygen in the mirror-polished surface was uniformly distributed at the lowest level. Comparatively, abrading with SiC papers increased the surface oxygen amount and hardness. Owing t...

Background: Stroke is one of the major causes of disability. Therefore, it is important to introduce and develop new treatment approaches in order to improve and enhance post stroke recovery process for medical, social and economical purposes. Aim: To determine the effect of mirror therapy on motor ability of patients with stroke. Methods: This Randomized Controlled Trial was conducted on 38 pa...

Objectives: Hand function is critical for daily life and work, especially with the use of electronic devices. This study determined the effect of mirror therapy in individuals with asymmetrical hand function. Method: Forty-two men with asymmetrical hand function were recruited. All participants were randomly divided into two groups: sham control (n = 21) and mirror therapy (n = 21). Both group...

abstractbeing present for centuries, myths are our ancestors’ heritage that continues to reverberate in man’s unconscious mind. they contain symbols, frequently reflected in a variety of forms in literary and art works of different eras.using these symbols for depicting a panoramic world will connect myths –which are often about supernatural incidences- to mysticism –which illustrates the unsee...