A simple mathematical model is developed to describe the dynamics of the nuclear-coupled thermal-hydraulics in a boiling water reactor (BWR) core. The model, which incorporates the essential features of neutron kinetics and single-phase and two-phase thermal-hydraulics, leads to a simple dynamical system comprised of a set of nonlinear ordinary differential equations (ODEs). The stability bound...

Qualitative reasoning about physical processes is based on the notion of "quantity space" [Forbus, 1984a, 1984b]. The question is how to construct a quantity space for a particular physical process. One line of research is to establish a set of so called "landmark points" by selecting some values of the continuous physical parameters characterizing the physical process under consideration [Kuip...

The interaction between the rotor and stator is a major source of high amplitude pressure fluctuation flow-induced vibration in multistage centrifugal pumps. detrimental to reliable operation sensitivity severe if number stages more. In present experimental study, vertical submersible pump used measure level at Best Efficiency Points (BEP) determine influence stage operating speed on fluctuatio...

patients and methods in this cross-sectional study, we evaluated all patients referred to a single rheumatology clinic for bone mineral density measurements from 2009 to 2010. all patients who had bone mineral density measurements taken from the hip, lumbar spine, forearm, and whole body were enrolled in the study. standard bone mineral density measurements were performed using a dual energy x-...