Due to the subsynchronous interaction between grid-side converter (GSC) of wind farms and rectifier (REC) voltage source converter-based high-voltage direct current (VSC-HVDC) transmission system, oscillations (SSOs) may occur in direct-drive with VSC-HVDC systems. Considering nonlinearities uncertainties a nonlinear SSO mitigation strategy is proposed this article based on feedback linearizati...

This paper studies the characteristics of subsynchronous oscillation (SSO) power propagation in systems with a large-scale wind farm integration. Based on instantaneous theory, novel definition SSO is proposed to characterize its propagation. The contains both DC components and AC components. Utilizing power, quantitatively studied single source systems, further multiple sources systems. Theore...

lipomatosis of the nerve, also known as fibrolipomatous hamartoma, is characterized by the infiltration of the nerve by fibro-fatty tissue. the affected nerve becomes thicker, and it simulates a mass lesion. lipomatosis usually affects the median nerve and lipomatosis of the sciatic nerve is extremely rare. magnetic resonance imaging (mri) is the key to diagnosis, and it is usually pathognomoni...

conclusion these data indicate that while ce-mri will depict more positive results, there are cases in which dwi will show a positive result while ce-mri is negative. we suggest that the combination of these two imaging modalities might yield more positive results in diagnosing acute ms attack giving rise to a more accurate diagnosis. results ce-mri yielded positive results for 61 (87%) patient...

the application of magnetic resonance to diagnostic medical imaging stands as one of the great scientific achievements in the past 50 years. magnetic resonance techniques are easily applied to organs which remain stationary during the imaging procedure, such as the brain and musculoskeletal system. imaging of moving heart structures and circulating blood is considerably more difficult.   clinic...

Metallic nanoparticles can exhibit very large optical extinction in the visible spectrum due to localized surface plasmon resonance. Spherical plasmonic nanoparticles have been the subject of numerous studies in recent years due to the fact that the scattering response of spheres can be analytically evaluated using Mie theory. However a major disadvantage of metallic spherical nanoparticles is ...