background: although the cox proportional hazard regression is the most popular model for analyzing the prognostic factors on survival of cancer patients, under certain circumstances, parametric models estimate the parameter more efficiently than the cox model.  the aim of this study was to compare the cox regression model  with parametric models in patients with gastric cancer who registered a...

A numerical simulation of the thermal and fluid-dynamic behaviour of hermetic reciprocating compressors has been developed by solving the one-dimensional and transient governing equations of the flow (continuity, momentum and energy) in the whole compressor domain. The governing equations are discretized using an implicit control-volume formulation. A SIMPLE-like algorithm, extended to compress...

INTRODUCTION: There has been a dramatic rise in the use of vertebroplasty for the treatment of vertebral compression fractures over the last decade. There are estimated to be over 700,000 such fractures each year in the United States alone, many of which lead to severe pain and a significant reduction in quality of life [1]. In the short term, vertebroplasty has been shown to reduce the pain an...