Self-starting performance is a key factor in the evaluation of a Darrieus straight-bladed vertical axis turbine. Most traditional studies have analyzed the turbine’s self-starting capability using the experimental and numerical data of the forced rotation. A 2D numerical model based on the computational fluid dynamics (CFD) software ANSYS-Fluent was developed to simulate the self-starting proce...

Introduction: Muscle length can be inferred from the length-tension relationship of the muscle. This relationship is traditionally investigated by measuring the peak torque produced by the muscle and the angle at which it is generated. Objective: The present study investigated the test-retest reliability of a method for measuring hamstring active peak torque angle in healthy young adults. Metho...

k thermal conductivity, W/mK An analytical model is developed for predicting constriction and spreading resistances associated with heat transfer from various electronic components under different modes of cooling. The model assumes a heat source in contact with a larger cold plate which is in turn cooled with a convective heat transfer coefficient specified over the sink surface. Unlike existi...

The major issue for the wheeled mobile robot is the low level controller gains tuning up especially in the robot competition. The floor surface can be damaged by the robot wheels during the competition, therefore the surface coefficient can be changed over time. PI gains have to be tuned before every match along the competition. In this research, the torque controller is defined and implemented...

It is shown that for 2D field theories only the first order coefficient of the gravitationally dressed RG β-function is scheme independent. This is valid even for matter theories with one dimensionless coupling, where the first two coefficients of the original β-function are scheme independent.

Most astrophysical accretion disks are likely to be warped. In X-ray binaries, the spin evolution of an accreting neutron star is critically dependent on interaction between magnetic field and disk. There have been extensive investigations torque exerted by a coplanar disk that magnetically threaded lines from stars, but relevant works warped/tilted still lacking. this paper we develop simplifi...

This paper is devoted to the numerical modeling and simulation of hydrodynamic and dissipation processes in damper systems, where the working element is a magnetic fluid drop around a permanent magnet. Flow patterns and dimensionless dissipation coefficient depending on the Reynolds number and magnet position are established. r 2004 Elsevier B.V. All rights reserved. PACS: 02.60.Cb; 02.70.Dh; 4...

Lie algebraic methods are described which were used to optimize the d~ign of the PEP-II lattices. These methods include calculation of the nonlinear Hamiltonian for lattice modules, dimensionless normalized representation of resonance basis coefficients, correlation of coefficients with dynamic aperture determination, and techniques for coefficient control and compensation.

This study investigated the effect of dimensionless light extinction coefficient on soot particles concentration for different combustion conditions bituminous coal. The pressures and burning temperatures were set between 0.1 MPa 0.3 MPa, 550 ℃ to 650 ℃, respectively. was experimentally measured calculated using full-field method Abel deconvolution technique. results this showed that increased ...