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- 저자 : Naisheng Liu (검색결과 2 건)
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Conformational Transitions of Polymer Brushes for Reversibly Switching Graphene Transistors
Liu, Song,Jamali, Safa,Liu, Qingfeng,Maia, Joao,Baek, Jong-Beom,Jiang, Naisheng,Xu, Ming,Dai, Liming American Chemical Society 2016 Macromolecules Vol.49 No.19
<P>We developed a facile, but efficient, approach to graphene field-effect transistors (FET) functionalized with polymer brushes, in which the conductance can be reversibly switched by solvent-induced polymer conformational changes. Our experimental and stimulation results demonstrated that the solvent-induced conformational transition of the polymer brush could affect the carrier concentration by changing the number of,scattering sites associated with the graphene-polymer contact areas, leading to reversible electrical switching for the graphene FET device. Both end-adsorbed diblock and triblock copolymers showed similar switching effect through the solvent-induced chain stretching-collapse and tail-to-loop conformational changes, respectively. This work provides new platform technologies for developing novel electronic devices with tunable electrical properties and for studying macromolecular conformations and conformational transitions.</P>
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A Novel Method for Thermal Analysis of MF Transformers with Hollow Windings
Bo Zhang,Ning Yan,Naisheng Liu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
One of the key problems in the research and development of high-power electronic transformer is the thermal analysis of high-frequency or medium frequency transformer under non-sinusoidal load. At present, there is a lack of a convenient and effective method. Taking the thermal problem of an medium frequency transformer with a hollow conductor structure as an example, this paper presents an analysis method suitable for researchers. Firstly, based on the finite element model, the loss of hollow winding is studied by numerical analysis. Then, based on the similarity principle, the equivalent reduction method for calculating the core loss of medium frequency transformer is presented. Finally, the measurement data of the magnetic properties of the transformer core and the measurement data of the transformer loss under the medium frequency excitation are given. The complete research work can provide a method for the thermal analysis of high frequency or medium frequency transformer.
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