Variable-speed wind turbines (VSWTs) typically use a maximum power-point tracking (MPPT) method to optimize wind-energy acquisition. MPPT can be implemented by regulating the rotor speed or by adjusting the active power. The former, termed speed-control mode (SCM), employs a speed controller to regulate the rotor, while the latter, termed power-control mode (PCM), uses an active power controlle...

The osteocyte is believed to act as the main sensor of mechanical stimulus in bone, controlling signalling for bone growth and resorption in response to changes in the mechanical demands placed on our bones throughout life. However, the precise mechanical stimuli that bone cells experience in vivo are not yet fully understood. The objective of this study is to use computational methods to predi...

Insufficiency of mechanical properties of tissue-engineered (TE) cartilage grafts is still a limiting factor for their clinical application. It has been shown that mechanostimulation of chondrocytes enhances synthesis of extracellular matrix (ECM) and thereby improves the mechanical properties of the grafts. However, the optimal mechanical loading required to stimulate chondrocytes for sufficie...

In the multi-attribute utility theory the utility functions are usually constructed by dots. It concerns both the lottery’s method and the value increasing method. In the both cases the utility function is constructed in the absolute scale [0,1] that causes inconveniences for experts. The comparative assessments look more preferable for decision-makers. The paired comparison matrix (PCM) looks ...

We compute the first four perturbative coefficients of internal energy for twisted reduced principal chiral model (TRPCM) using numerical stochastic perturbation theory (NSPT). This matrix has same large $N$ limit as ordinary (PCM) at infinite volume. Indeed, we verify that three match analytic result PCM with a precision to significant digits. The fourth coefficient also matches our own NSPT c...

in this paper, an adaptive attitude control algorithm is developed based on neural network for a satellite using four reaction wheels in a tetrahedron configuration. then, an attitude control based on feedback linearization control has been designed and uncertainties in the moment of inertia matrix and disturbances torque have been considered. in order to eliminate the effect of these uncertain...

The impact of frequency selective multipath fading on the bit error rate performance of ARTM Tier-1 waveforms (FQPSK and SOQPSK) is derived and analyzed. In the presence of a strong specular reflection with relative magnitude |Γ1|, the ARTM Tier-1 waveforms suffer a loss in performance of (1−|Γ1|)−4 √ |Γ1| for |Γ1| < 0.5 and a relatively high error floor at approximately 10−2 for |Γ1| ≥ 0.5. Th...

Recent advances in solid state technology have led to the introduction of Solid State Drives (SSDs). Todays SSDs store data persistently using NAND flash memory. While SSDs are more expensive than hard disks when measured in dollars per gigabyte, they are significantly cheaper when measured in dollars per random I/O per second. Additional storage technologies are under development, Phase Change...

To overcome the weak thermal conduction of phase change materials (PCM), This investigation aims to study effect circular Y-shaped fins added a two-pipe latent heat-saving unit compared with conventional fins. The system is placed in straight-up orientation, and PCM located annulus, whereas hot water moved inside internal tube charge material (PCM) point 35°C. Different independent geometric fa...