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RISS 인기검색어
- 검색키워드
- 저자 : Huc, Ivan (검색결과 3 건)
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Hu, C.,Youn, B.D.,Chung, J. Applied Science Publishers 2012 APPLIED ENERGY Vol.92 No.-
State-of-charge (SOC) and capacity estimation plays an essential role in many battery-powered applications, such as electric vehicle (EV) and hybrid electric vehicle (HEV). However, commonly used joint/dual extended Kalman filter (EKF) suffers from the lack of accuracy in the capacity estimation since (i) the cell voltage is the only measurable data for the SOC and capacity estimation and updates and (ii) the capacity is very weakly linked to the cell voltage. The lack of accuracy in the capacity estimation may further reduce the accuracy in the SOC estimation due to the strong dependency of the SOC on the capacity. Furthermore, although the capacity is a slowly time-varying quantity that indicates cell state-of-health (SOH), the capacity estimation is generally performed on the same time-scale as the quickly time-varying SOC, resulting in high computational complexity. To resolve these difficulties, this paper proposes a multiscale framework with EKF for SOC and capacity estimation. The proposed framework comprises two ideas: (i) a multiscale framework to estimate SOC and capacity that exhibit time-scale separation and (ii) a state projection scheme for accurate and stable capacity estimation. Simulation results with synthetic data based on a valid cell dynamic model suggest that the proposed framework, as a hybrid of coulomb counting and adaptive filtering techniques, achieves higher accuracy and efficiency than joint/dual EKF. Results of the cycle test on Lithium-ion prismatic cells further verify the effectiveness of our framework.
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Direct Synthesis and Integration of Individual, Diameter-Controlled Single-Walled Nanotubes (SWNTs)
Bouanis, Fatima Z.,Cojocaru, Costel S.,Huc, Vincent,Norman, Evgeny,Chaigneau, Marc,Maurice, Jean-Luc,Mallah, Talal,Pribat, Didier American Chemical Society 2014 Chemistry of materials Vol.26 No.17
<P>We present a robust and versatile approach for the reproducible and controllable growth of single-walled carbon nanotubes (SWNTs) through a self-assembled monolayer (SAM) technique coupled with an atomic hydrogen (H<SUB>at</SUB>) pretreatment to control the catalytic metallic nanoparticles size and density. The nanoparticles are obtained from a self-assembled monolayer of metal complexes or salts on a SiO<SUB>2</SUB> substrate using a two-step strategy. The oxide is first functionalized by silanization with a coordinating ligand leading to the formation of an anchoring SAM on the substrate. Then, metallic complexes such as ruthenium porphyrin (RuTPP) or metallic salts (FeCl<SUB>3</SUB>, RuCl<SUB>3</SUB>) are assembled by coordination bonds on the preformed organic SAM. Pyrolysis under radical hydrogen atmosphere of the as-prepared SAM yields metallic nanoparticles whose size and density are controlled and tuned. Using the as-formed nanoparticles as catalysts, SWNTs are grown by double hot-filament-assisted chemical vapor deposition (d-HFCVD). They exhibit a remarkably good crystalline quality, with a diameter (and type) strongly dependent on the nature of the initial catalyst precursor and its preparation. Field-effect transistors (FETs) with excellent characteristics were obtained using such in-place grown SWNTs. The electronic properties of the SWNTs can be tuned: the transistors obtained from Ru(TPP) and FeCl<SUB>3</SUB> exhibit <I>I</I><SUB>ON</SUB>/<I>I</I><SUB>OFF</SUB> current ratio up to ∼10<SUP>9</SUP>, indicative of the direct growth of a high proportion of semiconducting nanotubes over than 98%. Such elevated <I>I</I><SUB>ON</SUB>/<I>I</I><SUB>OFF</SUB> values have been reported essentially for CNT-FETs devices based on individual semiconducting SWNTs, so far. By contrast, devices obtained from the RuCl<SUB>3</SUB> salt display <I>I</I><SUB>ON</SUB>/<I>I</I><SUB>OFF</SUB> current ratio well below 10<SUP>2</SUP>, indicating the direct growth of SWNTs highly enriched in metallic specimens.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2014/cmatex.2014.26.issue-17/cm502282x/production/images/medium/cm-2014-02282x_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm502282x'>ACS Electronic Supporting Info</A></P>
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Ribosomal synthesis and folding of peptide-helical aromatic foldamer hybrids
Rogers, Joseph M.,Kwon, Sunbum,Dawson, Simon J.,Mandal, Pradeep K.,Suga, Hiroaki,Huc, Ivan Nature Publishing Group UK 2018 Nature chemistry Vol.10 No.4
Translation, the mRNA-templated synthesis of peptides by the ribosome, can be manipulated to incorporate variants of the 20 cognate amino acids. Such approaches for expanding the range of chemical entities that can be produced by the ribosome may accelerate the discovery of molecules that can perform functions for which poorly folded, short peptidic sequences are ill suited. Here, we show that the ribosome tolerates some artificial helical aromatic oligomers, so-called foldamers. Using a flexible tRNA-acylation ribozyme—flexizyme—foldamers were attached to tRNA, and the resulting acylated tRNAs were delivered to the ribosome to initiate the synthesis of non-cyclic and cyclic foldamer–peptide hybrid molecules. Passing through the ribosome exit tunnel requires the foldamers to unfold. Yet foldamers encode sufficient folding information to influence the peptide structure once translation is completed. We also show that in cyclic hybrids, the foldamer portion can fold into a helix and force the peptide segment to adopt a constrained and stretched conformation.
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