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RISS 인기검색어
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- 저자 : Basset, Philippe (검색결과 4 건)
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Understanding and modeling of triboelectric-electret nanogenerator
Hinchet, Ronan,Ghaffarinejad, Ali,Lu, Yingxian,Hasani, Javad Yavand,Kim, Sang-Woo,Basset, Philippe Elsevier 2018 Nano energy Vol.47 No.-
<P><B>Abstract</B></P> <P>Recently, electrostatic kinetic energy harvesters regained strong attention through the development of new triboelectric generators for harvesting green and renewable energy. These devices use a triboelectric dielectric layer as electret for polarizing their capacitance and they behave similarly to electret generators. However, triboelectric-based electret nanogenerators (T-ENG) have specificities arising from the contact electrification phenomenon and leading to different performances. For better understanding T-ENG, we investigated their electrical modeling with lumped-elements and multiphysics simulation in light of last researches on electret generators. To take into account T-ENG specificities, we experimentally measured the amplitude of the triboelectric effect on perfluoroalkoxy alkane films. This approach allowed fully simulating T-ENG and the model was found in agreement with experimental results. Understanding and verifying the model is capital, but to go further toward the application of T-ENG, we reused two electret circuits to extract the T-ENG model parameters in view of facilitating their realistic modeling and practical development into application.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report the electrical modeling of gap closing triboelectric-electret nanogenerators (T-ENG) and the study of their performances in the transitory and stationary regimes. </LI> <LI> We achieved multiphysics time dependent finite element method (FEM) simulations of gap closing T-ENG and found that results agree well with the electrical modeling, having less than 3% discrepancy. </LI> <LI> The comparison with T-ENG experimental measurements show very close shapes and amplitudes well synchronized, which validate the T-ENG electrical model. </LI> <LI> We used the T-ENG electrical model to extract the key parameters of a real T-ENG, which offers a way to compare T-ENG independently of mechanical stimulus. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>We report the modeling of gap closing triboelectric-electret nanogenerators (T-ENGs) and the study of their performances. The model developed agrees well with multiphysics time dependent finite element method simulations, having less than 3% discrepancy. The comparison with T-ENG experimental measurements shows very close shapes and amplitudes well synchronized, which validates the T-ENG model. This allows to better design T-ENG to maximize their performances. Finally, this model was used to extract the key parameters of a real T-ENG, offering a way to compare T-ENGs independently of mechanical stimulus.</P> <P>[DISPLAY OMISSION]</P>
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Zhu, Ping,Baek, Sung Hee,Bourk, Eliot M.,Ohgi, Kenneth A.,Garcia-Bassets, Ivan,Sanjo, Hideki,Akira, Shizuo,Kotol, Paul F.,Glass, Christopher K.,Rosenfeld, Michael G.,Rose, David W. Elsevier 2006 Cell Vol.124 No.3
<P><B>Summary</B></P><P>Defining the precise molecular strategies that coordinate patterns of transcriptional responses to specific signals is central for understanding normal development and homeostasis as well as the pathogenesis of hormone-dependent cancers. Here we report specific prostate cancer cell/macrophage interactions that mediate a switch in function of selective androgen receptor antagonists/modulators (SARMs) from repression to activation in vivo. This is based on an evolutionarily conserved receptor N-terminal L/HX<SUB>7</SUB>LL motif, selectively present in sex steroid receptors, that causes recruitment of TAB2 as a component of an N-CoR corepressor complex. TAB2 acts as a sensor for inflammatory signals by serving as a molecular beacon for recruitment of MEKK1, which in turn mediates dismissal of the N-CoR/HDAC complex and permits derepression of androgen and estrogen receptor target genes. Surprisingly, this conserved sensor strategy may have arisen to mediate reversal of sex steroid-dependent repression of a limited cohort of target genes in response to inflammatory signals, linking inflammatory and nuclear receptor ligand responses to essential reproductive functions.</P>
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A conditioning circuit with exponential enhancement of output energy for triboelectric nanogenerator
Ghaffarinejad, Ali,Hasani, Javad Yavand,Hinchet, Ronan,Lu, Yingxian,Zhang, Hemin,Karami, Armine,Galayko, Dimitri,Kim, Sang-Woo,Basset, Philippe Elsevier 2018 Nano energy Vol.51 No.-
<P><B>Abstract</B></P> <P>Triboelectric-electret nanogenerators (T-ENG) are characterized by their high output voltage and small current and therefore a relatively low output power, making them limited to small power consuming electronics. Here we report a self-enhancing conditioning circuit (CC) that exponentially amplifies the output electrical energy converted from the mechanical domain of a T-ENG, in orders of magnitude compared to traditional CC. The circuit, working on the principles of Bennet’s doubler device, is inductorless and uses only diodes as automatic switches to reconfigure the charge storing capacitors between series and parallel modes. We previously reported this circuit in saturation and stable mode for T-ENG and compared the performances with half-wave rectifier. Here we investigate the circuit performance in exponential and unstable mode in comparison with half-wave and full-wave rectifiers. Theoretical analysis is presented to study the operation of the circuit and to find out the required conditions for the Bennet’s doubler to work in exponential boosting mode. Output performance of half and full wave rectifiers are compared theoretically. Simulations and experiments are performed to verify the theoretical discussions and to present the effect of non-ideal circuit elements on the output performance of the T-ENG.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report a conditioning circuit (CC) for triboelectric-electret nanogenerators (T-ENG’s) based on the Bennet’s charge doubler. </LI> <LI> The proposed CC for the T-ENG employs only capacitors and diodes as automatic switching elements. </LI> <LI> A theoretical analysis of the Bennet’s doubler and its application for T-ENG is presented. </LI> <LI> Theoretical and experimental results indicate highly superior capability of the Bennet’s doubler compared to classical diode bridges. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Bennet's doubler working as a power booster for triboelectric nano-generators
Ghaffarinejad, A.,Lu, Y.,Hinchet, R.,Galayko, D.,Hasani, J.Y.,Kim, S.W.,Basset, P. Institution of Electrical Engineers 2018 Electronics letters Vol.54 No.6
<P>In this Letter, the authors introduce for the first time how a Bennet's doubler conditioning circuit will boost the extracted energy from an electrostatic kinetic energy harvester based on triboelectricity. With zero initial bias on all capacitors, after 1000 charging cycles, the harvested power is amplified by more than 2 orders of magnitude by the Bennet's doubler in comparison to a half-wave diode bridge. The harvested energy derived from a 3 x 3 cm(2) device made of polymer PFA and aluminium is at least 4.6 J per tap with the Bennet's doubler conditioning circuit, and only 30 nJ per tap with the half-wave bridge.</P>
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