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We demonstrate a graphene/nanotube hybrid phototransistor, in which photogating provided by the nanotube layer leads to a dramatically enhanced photoresponsivity (>100A/W) in the visible range, corresponding to ∼104 enhancement with respect to a graphene-only device.
A photodetector based on SWNT-graphene hybrid films and facile fabrication steps is demonstrated, which exhibits a remarkably high photoresponsivity of ∼ 100 A/W, across visible (400 nm) to the telecommunication wavelengths (1550 nm).
This paper evaluates the use of a back-to-back modular multilevel converter (B2B-MMC) in offshore low frequency (LF) AC transmission. The scheme is compared to two alternative transmission technologies: DC and 50Hz AC. The MMC topology is further compared to a cycloconverter. A high level design of a ±120kVdc, 250MW B2B-MMC system is described, with the total volume and weight of submodule capacitors...
The harmonics produced by the voltage source converters (VSCs) will be a challengeable power quality problem in modern power system. The digital simulation is an important approach to analyze the harmonic problems of the power electronic devices. The time step of simulation is the key point which affects the accuracy of the harmonic analysis of discrete signals in the digital simulations. This paper...
Concentrated collection of all kind of data in smart substation is a valuable job. In this paper, a method of data acquisition is proposed in the smart substation. A communication server is used to access subsystems in the substation and the received data are modeled according to IEC61850 standard. The external interface is supplied in according with IEC 61970 GID and IEC 61850 MMS. By this way, requirement...
PETREL, a winged hybrid-driven underwater glider is presented, which features long-endurance low-noise while penetrating the ocean like a UW glider and burst-speed high-maneuverability while operated as an AUV. In addition, kinematic and dynamic model of the vehicle are developed based the theorem of momentum and moment of momentum. Moreover, equations of equilibrium indicating the balance pitch and...
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