The paper presents a novel hydraulic fracturing model for the characterization and simulation of the complex fracture network in shale gas reservoirs. We go beyond the existing method that uses planar or orthogonal conjugate fractures for representing the ‘‘complexity’’ of the network. Bifurcation of fractures is performed utilizing the Lindenmayer system based on fractal geometry to describe t...

hoffa fracture is a rare injury consisting of unicondylar tangential posterior fracture of the distal femur and only very few cases have been reported in the literature. these fractures are due to high energy trauma and conservative treatment generally yields poor results, but rigid internal fixation allows early functional rehabilitation and decreases the incidence of complications. the purpos...

We have studied the progression of healing in 103 unstable fractures of the tibia. In 76 patients we removed the external fixator once the stiffness had reached 15 Nm/degrees in the sagittal plane. Deformity at the site of the fracture subsequently occurred in four patients. In a further 27, we measured stiffness in several planes and removed the fixator only when the stiffness reached 15 Nm/de...

Abstract Fluid flow through the brittle crust is primarily controlled by capability of fracture networks to provide pathways for fluid transport. The dominant permeability orientation within fractured rock masses has been consistently correlated with development intersections; an observation also made at meso‐regional scale. Despite importance attributed intersections in promoting flow, magnitu...

Background. Abnormal spinal curvature is routinely assessed with plain radiographs, MDCT, and MRI. MDCT can provide two-dimensional (2-D) orthogonal as well as reconstructed three-dimensional volume-rendered (3-D VR) images of the spine, including the translucent display: a computer-generated image set that enables the visualization of surgical instrumentation through bony structures. We hypoth...

introduction: the main purpose of this study was to evaluate the prevalence of ophthalmic injuries associated with mid-facial fractures in patients admitted to shahid beheshti university hospital in babol, iran, from 2002 to 2012. materials and methods: a cross-sectional, retrospective study was undertaken to determine the prevalence of ophthalmic injuries associated with mid-facial fractures i...

A (symmetric) nested orthogonal array is a symmetric orthogonal array OA(N, k, s, g) which contains an OA(M,k, r, g) as a subarray, where M < N and r < s. In this communication, some methods of construction of nested symmetric orthogonal arrays are given. Asymmetric nested orthogonal arrays are defined and a few methods of their construction are described.