PURPOSE To compare three commonly used retinal vessel caliber measurement software systems, and propose an algorithm for conversion between measurement systems. METHODS We used 120 retinal photographs to evaluate the agreement between three commonly used software (Retinal Analysis [RA], Integrative Vessel Analysis [IVAN], and Singapore I Vessel Assessment [SIVA]). Bland-Altman plots were used...

this study aimed to investigate the spatial perception and evaluation of the place-based affordance of mosques in tehran. reviewing the literature and applying gibson`s affordance and canter`s place theory, the new model called place-based affordance is proposed. in this model, each location contains two potential types of symbolic and behavioural affordance. accordingly, throughout history, be...

The Islamic world has a rich artistic tradition of creating highly geometric and symmetric ornamentation. Over the centuries, the process of creating Islamic tilings was refined from the 15th Century ornamentation in the Alhambra Palace in Granada, Spain to the exquisite tilings, which are seen in mosques, mausoleums and minarets throughout the world today. The contemporary mathematics of group...

Tiling Theory studies how one might cover the plane with various shapes. Medieval Islamic artisans developed intricate geometric tilings to decorate their mosques, mausoleums, and shrines. Some of these patterns, called girih tilings, first appeared in the 12 Century AD. Recent investigations show these medieval tilings contain symmetries similar to those found in aperiodic Penrose tilings firs...

the electric quadrupole, hexadecapole moments, energy (kjmol -1) for some armchair polyhex carbon nanotubes tuvc6[2p,q] are performed by beck-lee-yang-parr [b3lyp] on 3-21g basis set using the standard procedure indices gaussian 98, then the padmakar-ivan (pi) index of tuvc6[2p,q] nanotubes in the terms of their circumference (2p) and lengh (q) is calculated and the relationships between the pa...