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This paper proposes a robust H∞ controller based on Multi-objective genetic algorithms (MOGAs) to control the active magnetic bearings (AMBs) with application to superfluid helium cryogenic centrifugal compressor (CCC). Basic weighting function formulas with seven parameters in all are suggested for H∞ controller, whose physical connections with system performance are clearly explained. Weighting...
The concepts of rotation symmetric structure, symmetric canonical form and symmetric order are defined for linear control systems. It is shown from the results of this paper that the controll systems with rotation symmetry can be transformed to the symmetric canonical form using an appropriate transformation. From this, a new method for proving the stability of control systems with the special structure...
The kelp bed of Gouqi Island lies in the east of the East China Sea, in the Shengsi Archipelago. It is a key component of the island-reef ecosystem. This study evaluated kelp beds on intertidal and subtidal zones from 2004 to 2006. We evaluated seasonal variations in the community structure of macroalgae, and their relationship with water temperature, nitrogen and phytoplankton. The Gouqi Island kelp...
The paper developed two mathematical models for DFIG without and with Stator Winding Inter-turn Short Circuit (SWITSC) failure respectively. The small-signal stability of DFIG is studied then by combining the wind turbine model and pitch control system for the small-signal stability studies. Under different external conditions and internal state (such as wind speed and short circuit ratio varied),...
Nonlinear polarization vector translation (PVT) is applied in the area of radar anti-jamming in this paper. The processes of real number type and ratio type diagonal matrix PVT are analyzed, pointing out their deficiencies in polarization states separation of the target and jamming. Then exponential diagonal matrix PVT is proposed and show its advantage on both polarization state angle and polarization...
Recent development of Electron Backscattering Diffraction (EBSD) technique has advanced to allow users to perform Transmission Kikuchi diffraction (TKD), and also known as transmission-EBSD (t-EBSD) with the existing conventional EBSD detector, and field emission scanning electron microscope (FESEM). More importantly, this technique has been known for the significant improvement in spatial resolution...
There are some different traits about the collaborative technological innovation between the core enterprise and general partner among the technological alliance. Based on the Ngo et al (2008), this paper analyzes the innovation cost, the competition level and the co-opetitive relationships from Stackelberg game theoretical approach, and comes to the following conclusions: when the core enterprise...
The 3–4μm wavelength range is of key technological importance for a wide range of applications. As a consequence of the strong fundamental C-H stretch mode that occurs at around 3.3μm, the detection of many important hydrocarbon species has maximum sensitivity (potentially ∼ parts per trillion) in this range. This leads to many important applications in various areas, for example, clinical diagnostics,...
We report InSbN films prepared by two-step nitrogen ion implantation into InSb wafers. It is found that films of over 400 nm with nearly uniform nitrogen distribution can be formed and most of the implanted nitrogen ions can form In-N bonds, resulting in band gap bowing and reduction of carrier concentration. It is also found that such films can detect long wavelength infrared radiation and the absorption...
A quaternary-barrier structure is employed to reduce the strain at the interface between the quantum well and barriers for GaInNAs/GaAs materials. A very-low room-temperature threshold current density of 178A/cm2 is demonstrated with 1.34-μm GaInNAs/GaAs lasers.
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