Introduction:  In patients who underwent surgery to repair Tetralogy of Fallot, right ventricular dilation from pulmonary regurgitation may be result in right ventricular failure, arrhythmias and cardiac arrest. Hence, pulmonary valve replacement may be necessary to reduce right ventricular volume overload. The aim of present study was to assess the effects of pulmonary valve replacement on rig...

An experiment featuring waterhammer in viscoelastic pipes is presented in which the effects of pipe-wall viscoelasticity on waterhammer pressures are investigated. A large-scale pipeline apparatus made of polyvinyl chloride (PVC) at Deltares, Delft, The Netherlands, has been used to carry out waterhammer experiments. Tests have been conducted in a reservoir-pipeline-valve system consisting of a...

Background: Heart valve disease gradually increases the pressure in the heart chambers and impairs heart pumping. It influences on quality of life due to low output, disability, fear, amnesia, anxiety, and depression. Although most of signs and symptoms in patients with heart valve diseases may significantly decrease after valve replacement surgery, there is limited information about the impact...

Hydraulic applications requiring a variation in the speed or torque of actuators have historically used throttling valve control or a variable displacement pump or motor. An alternative method is switch-mode control that uses a high-speed valve to rapidly switch between efficient on and off states, allowing any hydraulic actuator to have virtually variable displacement. An existing barrier to s...

Throat ring leakage is a major factor deteriorating the performance of multistage centrifugal pumps. This paper focuses on optimization pumps by incorporating principle Tesla valve and adding an auxiliary set blades to impeller body. By changing direction magnitude leaking fluid’s flow, volume throat reduced. The study results demonstrate that experimental error in head calculation with numeric...

The model from Gao and Owen (2017) applied those U-statistics to Yij instead of ηij . In our notation, their Yij = μ+ ηij . Because the intercept μ cancels, these U-statistics defined via ηij are equivalent to those defined via Yij . Theorem 9.1. Let Yij follow the random effects model (1) with the observation pattern Zij as described in Section 2. Then the U -statistics defined at (100) have v...

Linear models for uncorrelated data have well established measures to gauge the influence of one or more observations on the analysis. For such models, closed-form update expressions allow efficient computations without refitting the model. When similar notions of statistical influence are applied to mixed models, things are more complicated. Removing data points affects fixed effects and covar...

Linear models for uncorrelated data have well established measures to gauge the influence of one or more observations on the analysis. For such models, closed-form update expressions allow efficient computations without refitting the model. When similar notions of statistical influence are applied to mixed models, things are more complicated. Removing data points affects fixed effects and covar...

<span>The economic dispatch is used to find the best optimal output of power generation at lowest operating cost each generator, fulfill requirements consumer. To get a practical solution, several constraints have be considered, like transmission losses, valve point effect, prohibited region, and emissions. In this research, effect considered which increases complexity problem due its rip...