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Defect Analysis of the β– to γ–Ga2O3 Phase Transition

Advanced Functional Materials, EarlyView.
The role of defects at all the relevant stages of the β$\beta$‐ to γ$\gamma$‐Ga2O3 polymorph transition is investigated using a multi method approach. The positron annihilation spectroscopy based results show that the defect density decreases after the transition, and that changes in defect configuration within the γ phase occur with increasing ...
Umutcan Bektas, Maciej O. Liedke, Huan Liu, Fabian Ganss, Maik Butterling, Nico Klingner, René Hübner, Ilja Makkonen, Andreas Wagner, Gregor Hlawacek   +9 more
wiley   +1 more source

CRISPR/Cas9‐Assisted Microrobots for Fast and Ultrasensitive “On‐The‐Fly” Next‐Generation DNA Detection

Advanced Functional Materials, EarlyView.
This work presents self‐propelled CRISPR/Cas9‐functionalized Au–MRs for rapid, amplification‐free, “on‐the‐fly” DNA detection. By harnessing motion‐assisted signal recovery, the platform achieved the limit of detection in low fM DNA concentrations, enabling detection across a wide dynamic range within only 5 min, which is significantly faster than any ...
Jyoti, Petr Michálek, Zbyněk Heger, Martin Pumera   +3 more
wiley   +1 more source

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Multilevel Optimal Predictive Dynamic Voltage Restorer

IEEE Transactions on Industrial Electronics, 2010
This paper presents an optimal predictive controller for a multilevel converter-based dynamic voltage restorer (DVR), which is able to improve the voltage quality of sensitive loads connected to the electrical power network. The optimal predictive controlled multilevel DVR can restore sags and short interruptions while reducing the total harmonic ...
J Dionísio Barros
exaly   +2 more sources

Multilevel Dynamic Voltage Restorer

IEEE Power Electronics Letters, 2004
This paper presents the implementation and control of a high voltage dynamic voltage restorer (HVDVR) for use in power distribution network to compensate for sags in utility voltages. The proposed HVDVR is implemented using a multilevel inverter topology with isolated DC energy storages, allowing the direct connection of the HVDVR to the distribution ...
P.C. Loh, D.M. Vilathgamuwa, S.K. Tang, H.L. Long   +3 more
openaire   +1 more source

Transformerless dynamic voltage restorer

IEE Proceedings - Generation, Transmission and Distribution, 2002
The feasibility of achieving dynamic voltage restoration without the use of the injection transformer is investigated. The configuration of a proposed transformerless dynamic voltage restorer (DVR) features separate energy storage capacitors for phase-to-phase isolation, cascaded switches/inverters for the voltage boosting functions and a dynamic ...
B.H. Li, S.S. Choi, D.M. Vilathgamuwa
openaire   +1 more source

Voltage flicker mitigation with dynamic voltage restorer

2010 1st Power Electronic & Drive Systems & Technologies Conference (PEDSTC), 2010
This paper is concerned with a pre-flicker compensation strategy adopted by a dynamic voltage restorer (DVR) to mitigate voltage flicker in a power system. The DVR configuration based on flying capacitor multicell (FCM) converter is proposed to mitigate the voltage flicker because of taking the FCM converter advantages such as transformer-less ...
Arash Khoshkbar Sadigh, Seyed Hossein Hosseini, Mehdi Farasat, Ehsan Mokhtarpour   +3 more
openaire   +1 more source

Dynamic Voltage Restorer For Voltage Sag Compensation

2005 International Conference on Power Electronics and Drives Systems, 2006
The Dynamic Voltage Restorer (DVR) is a power electronic device that is used to inject 3-phase voltage in series and in synchronism with the distribution feeder voltages in order to compensate for voltage sag. In this paper the operation of a DVR is presented.
A.K. Ramasamy, R. Krishnan Iyer, V.K. Ramachandaramuthy, R.N. Mukerjee   +3 more
openaire   +1 more source

Voltage Sag Detection Technique for a Dynamic Voltage Restorer

IEEE Transactions on Industry Applications, 2003
Dynamic voltage restorers (DVRs) are used to protect sensitive loads from the effects of voltage sags on the distribution feeder. This paper presents and verifies a novel voltage sag detection technique for use in conjunction with the main control system of a DVR.
Fitzer, Chris, Barnes, Mike, Green, Peter   +2 more
openaire   +2 more sources

Voltage sag compensation with energy optimized dynamic voltage restorer

IEEE Transactions on Power Delivery, 2002
The compensation capability of a dynamic voltage restorer (DVR) depends primarily on the maximum voltage injection ability and the amount of stored energy available within the restorer. A new phase advance compensation (PAC) strategy for the DVR is proposed in order to enhance the voltage restoration property of the device.
Vilathgamuwa, Mahinda, Perera, A.A.D.R., Choi, San Shing   +2 more
openaire   +2 more sources

Dynamic Voltage Restorer lab prototype

2008 IEEE 2nd International Power and Energy Conference, 2008
Voltage sag according to the IEEE standard is a momentary decrease (10% - 90%) in the root mean square (rms) voltage magnitude where the duration is longer than half a cycle and less that one minute. The common causes of voltage sag are faults or short circuit in the system, starting of large loads and faulty wiring. Dynamic voltage restorer (DVR) is a
Agileswari K. Ramasamy, Vigna Ramachandaramurthy, Rengan Krishna Iyer   +2 more
openaire   +1 more source