varicella-zoster viruses complications involving the cns are estimated to occur rarely, transverse myelitis after varicella-zoster virus in most patients is characterized by an abrupt onset of progressive weakness and sensory disturbance in the lower extremities , like other viruses. we describe the case of 17 year-old boy who experienced cervical transverse myelitis after chickenpox with inabi...

Computational fluid dynamics is implemented to investigate the influence of the wheel contact patch on the global car aerodynamics. Two main aspects of the problem are the contact step and patch shape. Three important parameters: step height, cut angle, and tire tread shape are taken into consideration. For validations of the numerical results, the experimental data are also considered. The obt...

BACKGROUND Tripping is a common factor in falls and a typical safety strategy to avoid tripping on steps or stairs is to increase foot clearance over the step edge. In the present study we asked whether the perceived height of a step could be increased using a visual illusion and whether this would lead to the adoption of a safer stepping strategy, in terms of greater foot clearance over the st...

A digital height field is an array of height values assigned to the vertices of a regular grid in the two-dimensional domain over which an explicit function (landscape) is defined. A new direct rendering algorithm for digital height fields is described. “Direct rendering” means that the image is calculated without an intermediate step of conversion to a polygonal mesh. It is shown that direct h...

recently the stepped spillways have been used as an appropriate solution for energy dissipation. in the present study, siahbisheh dam spillway is simulated by using computational fluid dynamic (cfd), in which the mixture method and reynolds stresses model (rsm) turbulence model is used. in the first modeling series the over all steppes slope is constant. the number of the steps is increased to ...

A slice-to-volume registration algorithm, to be used for prostate tracking, is presented. The technique is designed to provide patient tracking information for prostate biopsy performed under MR guidance. Interventional MR slices are acquired from a static physical plane just prior to needle insertion. These slices are registered to a high resolution volume of the patient. Registration is perfo...

We report a unique pattern of multiple asymptomatic pyogenic granuloma found in the mucosa of the transverse colon, 4 cm distally to a colostomy site in a 2 year old boy with rectal aganglionosis. The peculiar lesion formed a group of exophytic, topographically-related masses up to 5 mm in height containing the proliferated capillaries. Endothelial markers (CD31, CD34, FVIII) were positive but ...

In this paper, we present a novel two-step, variational and feature preserving smoothing method for terrain data. The first step computes the field of 3D normal vectors from the height map and smoothes them by minimizing a robust penalty function of curvature. This penalty function favors piecewise planar surfaces; therefore, it is better suited for processing terrain data then previous methods...

Using continued fractions we study the ground state properties of the spin– 1 2 Ising chain in a transverse field with periodically varying interaction strengths and external fields. We consider in detail the chain having the period of modulation of interactions equals 2 and compare the results obtained with those corresponding to the spin– 1 2 isotropic XY chain in a transverse field. In contr...