this paper proposes a flexible power electronic transformer (fpet) for the application in the micro-grids. the low frequency transformer is usually used at the point of common coupling (pcc) to connect the low voltage grid and utility network to each other. the conventional 50hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. in this pap...

We investigate the influence of a dark photon on Casimir effect and calculate corresponding leading contribution to energy. For expected magnitudes - mixing parameter, turns out be negligible. The plasmon dispersion relation is also not noticeably modified by presence photon.

The technical feasibility of superefficient family cars has been demonstrated. Yet it has typically compromised vehicle performance, safety, cost, manufacturability, or marketability. Industry experimentation has tended to focus on improving performance, or on implementing hybrid-electric drivesystems in essentially conventional vehicles, or on reducing mass and drag, or on improving safety—but...

We explore the cosmological implications of an ultra-light pseudo-Nambu-Goldstone boson. With global spontaneous symmetry breaking scale f ' 10 18 GeV and explicit breaking scale comparable to MSW neutrino masses, M 10 3 eV, such a eld, which acquires a mass m M 2 =f H 0 , would have become dynamical at recent epochs and currently dominate the energy density of the universe. The eld acts as an ...

power system blackouts have become a serious problem for electric utilities especially in recent years. different forms of system instability have emerged in recent blackouts, such as voltage instability and frequency instability. to counteract each form of system instability, special algorithms have been designed in the protection system, e.g. under frequency load shedding (ufls) and under vol...

Yet the audio quality on most devices is inferior. Typical signal-to-noise ratios measure in the 60 to 70 dB range (re –20 dBFS), which is about 5-10 dB worse noise than good portable CD players. They tend to suffer from non-flat frequency responses (bass and treble boost being the biggest offenders) with limited low frequency response (typically rolled off beginning at 60 Hz apparently to comp...

Low-voltage high-speed switched-capacitor (SC) circuit design without using voltage bootstrapper is presented. The basic building block used for low-voltage SC circuit design is the auto-zeroed integrator (AZI), which can work at both low voltage and high sampling frequency. With this method, two low-voltage SC systems were successfully designed and implemented in 1.2m CMOS technology. The firs...