We present an analytical model for the damping of Alfvén waves in the partially ionized chromosphere. The damping is due to collisions between ions and neutrals. The ionneutral collision frequency in this environment is such that the ion and neutral populations are almost perfectly collisionally coupled, leading the Alfvén wave to behave as if it acts on the whole plasma (i.e. including neutral...

Tendons can function as springs and thereby preserve energy during cyclic loading. They might also have damping properties, which, hypothetically, could reduce risk of microinjuries due to fatigue at sites of local stress concentration within the tendon. At mechanical testing, damping will appear as hysteresis. How is damping influenced by training or disuse? Does training decrease hysteresis, ...

FACTS devices like TCPAR can be used to regulate the power flow in tie-lines of interconnected power system. The transient state power flow occurring after power disturbances can be influenced by using TCPAR equipped with power regulator and frequency-based stabilizer. The analysis of a simple interconnected power system consisting of two power systems has shown that the control of TCPAR can fo...

Malaysians were reported to have the most number of Facebook friends, spend more time on Facebook and might be addicted to Facebook as well. This paper explored Facebook usage pattern, motivations and psycho logical/behavioural factors affecting the users. A focus group study was first conducted to explo re motives to use Facebook and symptoms related to excessive Facebook usage. The themes eme...

This paper proposes a scheme to produce realistic force reflection in a needle insertion problem. The target system is the spine needle biopsy simulator for tumor inspection by needle insertion. Simulated force is calculated using the 3D human tissue model, the orientation and position of the needle, and this force is produced through the PHANToM device. To generate realistic force reflection, ...

We study the possibility of occurrence vibrational resonance in a softening Duffing oscillator underdamped and overdamped cases both theoretically as well numerically. The is driven by two periodic forces. Numerically we find that case oscillatory solutions are obtained limited range parameters considered (damping coefficient amplitude high frequency force) for fixed low force depending on init...