To solve the practical problem of Stirling engine piston ring, numerical model on friction and lubrication were established based average Reynolds equation theory. Numerical calculation results show: rings are in mixed state which gas film micro-convex body contact existing simultaneously; pressure is 2 orders magnitude less than pressure; approximately linearly related to mean pressure. Simula...

purpose: to report a case of enophthalmos secondary to complete globe dislocation into the maxillary sinus due to orbital fracture. patient and findings: an 18-year-old man was referred to labafinejad hospital, one week after a car accident. at initial examination, the globe was not seen within the right orbit. a large floor fracture and globe luxation into the right maxillary sinus were confir...

We consider a system of interacting non-relativistic bosons confined to one-dimensional ring in the presence synthetic gauge field induced by rotating barrier. Interactions are introduced as constraint space, and barrier is modeled general boundary conditions. Within this setup, we compute effective action investigate profile ground state its sensitivity from rotational velocity properties

Developing artificial neural network (ANN), a model to make a correct prediction of required force and torque in ring rolling process is developed for the first time. Moreover, an optimal state of process for specific range of input parameters is obtained using Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) methods. Radii of main roll and mandrel, rotational speed of main roll, pr...

Purpose: To report the formation of the continuous curvilinear capsulorhexis (CCC) window in cases of intraocular lens (IOL)–Capsular Tension Ring (CTR) complex dislocation, determine appropriate indications for using CTRs, and evaluate surgical techniques for repositioning of the dislocated IOL–CTR complex. Methods: Four consecutive patients who underwent IOL repositioning surgery for IOL–CTR ...

in this paper, we study some ring theoretic properties of the amalgamated duplication ring $rbowtie i$ of a commutative noetherian ring $r$ along an ideal $i$ of $r$ which was introduced by d'anna and fontana. indeed, it is determined that when $rbowtie i$ satisfies serre's conditions $(r_n)$ and $(s_n)$, and when is a normal ring, a generalized cohen-macaulay ring and finally a filter ring.

Crescent fracture dislocations are a well-recognised subset of pelvic ring injuries which result from a lateral compression force. They are characterised by disruption of the sacroiliac joint and extend proximally as a fracture of the posterior iliac wing. We describe a classification with three distinct types. Type I is characterised by a large crescent fragment and the dislocation comprises n...

Traumatic anterior dislocation of the hip is an extremely rare condition in children and open dislocation is even rarer. This isusually caused by high-energy trauma. In the current study, we present a case of an eight-year-old child suffering from an open anterior-inferior dislocation of the right hip concomitant with pelvic ring disruption and an ipsilateral open distal femoral fracture (Salte...

BACKGROUND Pelvic ring injuries and sacroiliac dislocations have significant impacts on patient's quality of life. Several techniques have been described for posterior pelvic fixation. The current study has been designed to evaluate the spinopelvic method of fixation for sacroiliac fractures and fracture-dislocations. METHODS Between January 2006 and December 2014, 14 patients with sacroiliac...