This paper reports on the evolution of the spatial (sketchbased) query language VISCO and its implementation. The first design of VISCO’s query language was presented at VL ’97. The language is based on a strong naive physics metaphor for query objects (e.g. marbles, nails, rubberbands). We shortly review the prominent aspects of the revised version of VISCO’s query language. The main focus of ...

Particle diiusion in rotating drums is studied via computer simulations using a full 3-D model which does not involve any arbitrary input parameters. The diiusion coeecient for single-component systems agree qualitatively with previous experimental results. On the other hand, the diiusion coeecient for two-component systems is shown to be a highly nonlinear function of the rotation velocity. It...

This paper is an pedagogical essay on the scenario of the instabilities and the transition to turbulence in visco-elastic polymer flows. When polymers are long, they get easily stretched by the shear present in flows, and the viscosity of the solution or melt is large. As a result, inertial effects are usually negligible as the Reynolds numbers are small but the fluid is strongly nonNewtonian d...

purpose: to determine the indications for and surgical techniques of corneal transplantation at labbafinejad medical center (lmc) from 2004 to 2007. methods: in this descriptive study, records of 756 patients who had undergone corneal transplantation from october 2004 to october 2007 were reviewed. results: overall, 504 male (64.9%) and 272 female (35.1%) subjects with mean age of 41.29±21.25 (...

purpose: to evaluate corneal thickness changes after soft contact lens (scl) removal in lasik candidates. methods: fifty lasik candidates (100 eyes) with history of daily wear scl for at least 6 months were enrolled in this descriptive study. central corneal thickness was measured by ultrasonic pachymetry immediately after lens removal and then repeated daily at the same time, until the thickne...

purpose: to specify histopathologic features of corneal involvement in a case with xeroderma pigmentosum (xp). case report: a 19-year-old man with a clinical diagnosis of xp presented with bilateral corneal leukoma and decreased visual acuity predominatly in his right eye. penetrating keratoplasty was performed in the right eye due to severe corneal opacity, vascularization and lipid deposition...