Geopersia is published biannually by the College of Science, University of Tehran, Iran. The College of Science published Journal of Science, which covered all fields of basic science, from 1968 to 2010. It was then decided that the College’s journals should be more specialized, and hence publication of Geopersia was launched. Articles printed in Geopersia will be available online too. Aims an...

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The urchin Diadema antillarum Philippi (Echinodermata: Echinoidea) was extremely rare to absent from reefs throughout Jamaica during much of the 1980s and part of the 1990s following a Caribbean wide mortality event. This survey was conducted in 2007 to assess their distribution on the western forereef of Discovery Bay, Jamaica. Mean urchin densities of 3.93 ± 3.4 m -2 (mean ± SD) are the highe...

introduction: flat foot is one of the most common disorders which not only influences the performance of the foot, but also affects the alignments of the ankle, knee and hip joints. the performance of flat arched differs from that of normal subjects during walking. however, there is not enough information in the literature regarding the difference between standing stability. moreover, the influ...

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Recently, the Association for Research in Vision and Ophthalmology (ARVO) took a major step forward in strengthening its journals program with the addition of a third title, Translational Vision Science & Technology (TVST). Along with TVST, ARVO’s family of journals now includes Journal of Vision (JOV) and, of course, IOVS. Together, they cover all facets of eye and vision research at the highe...

In 2001, S. Bulman-Fleming et al. initiated the study of three flatness properties (weakly kernel flat, principally weakly kernel flat, translation kernel flat) of right acts $A_{S}$ over a monoid $S$ that can be described by means of when the functor $A_{S} otimes -$ preserves pullbacks. In this paper, we extend these results to $S$-posets and present equivalent descriptions of weakly kernel p...

Abstract Background: The aim of this study was to evaluate the efficacy and safety of phacoemulsification and the implantation of intraocular lenses (IOL) combined with trabeculectomy supplemented by releasable sutures and antimetabolite agents. Methods:Phacotrabeculectomy was performed in 36 eyes of 30 patients who hadmedically uncontrolle...

We present observations of the Vela X region at 31 GHz using the Cosmic Background Imager (CBI). We find a strong compact radio source (5A9 ; 4A1, FWHM) about the Vela pulsar, which we associate with the Vela pulsar wind nebula (PWN) recently discovered at lower radio frequencies. The CBI’s 40 resolution for a 450 field of view allows the PWN to be studied in the large-scale context of Vela X. ...

The design floods of several reservoirs were recently re-evaluated and the revised spillway outflow could result in dam overtopping with catastrophic consequences for some embankment structures. Herein a physical study was performed on flat and pooled stepped spillways with a slope typical of embankments (θ = 26.6◦) and four stepped configurations were tested: a stepped spillway with flat horiz...