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On-Surface Synthesis of Anthracene-Fused Zigzag Graphene Nanoribbons from 2,7-Dibromo-9,9′-bianthryl Reveals Unexpected Ring Rearrangements

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Precision Chemistry 2024年第2期2卷 81-87页

作者： Xiushang Xu Amogh Kinikar Marco Di Giovannantonio Carlo A.Pignedoli Pascal Ruffieux Klaus Müllen Roman Fasel Akimitsu Narita Max Planck Institute for Polymer Research 55128 MainzGermany Organic and Carbon Nanomaterials Unit Okinawa Institute of Science and Technology Graduate UniversityKunigami-gunOkinawa 904-0495Japan Empa Swiss Federal Laboratories for Materials Science and Technologynanotech@surfaces Laboratory8600 DübendorfSwitzerland Institute of Structure of Matter-CNR(ISM-CNR) 00133 RomaItaly Institute of Physical Chemistry Johannes Gutenberg University Mainz55128 MainzGermany Department of Chemistry Biochemistry and Pharmaceutical SciencesUniversity of Bern3012 BernSwitzerland

On-surface synthesis has emerged as a powerful strategy to fabricate unprecedented forms of atomically precise graphene nanoribbons(GNRs).However,the on-surface synthesis of zigzag GNRs(ZGNR)has met with only limited ***,we report the synthesis and on-surface reactions of 2,7-dibromo-9,9′-bianthryl as the precursor towardπ-extended *** by scanning tunneling microscopy and high-resolution noncontact atomic force microscopy clearly demonstrated the formation of anthracene-fused *** skeletal rearrangements were also observed,which could be explained by intramolecular Diels-Alder *** calculations of the electronic properties of the anthracene-fused ZGNRs revealed spin-polarized edge-states and a narrow bandgap of 0.20 eV.

关键词： On-surface synthesis Graphene nanoribbon On-surface reaction Rearrangement Edge state

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Control Evaluation of Antagonistic Series Elastic Actuation for a Robotic Endoscope Joint

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Journal of Bionic Engineering 2022年第4期19卷 965-974页

作者： Lorin Fasel Nicolas Gerig Philippe C.Cattin Georg Rauter BIROMED-Lab Department of Biomedical EngineeringUniversity of Basel4123AllschwilSwitzerland CIAN Department of Biomedical EngineeringUniversity of Basel4123AllschwilSwitzerland

Haptic feedback is typically missing during telemanipulation of surgical robots in minimally invasive surgeries,i.e.,surgeons cannot feel the interaction forces between the instruments and ***,surgeons have to solely rely on visual feedback,which increases complexity of guiding the instruments and poses the safety threat of unperceivable contacts outside the field of *** propose a novel series elastic actuation design for articulated robotic endoscopes to overcome these limitations and evaluate an according device with one *** to the actuation of human fingers,the joint is driven by antagonistic *** are integrated in the transmission between the tendons and the motors outside of the endoscope *** estimated the joint angle and thereby the endoscope shape,measured spring deflection,estimated tendon forces from that deflection,and implemented force control for the endoscope *** torque control and impedance control were evaluated under application of both a continuous force and an impact force to the endoscope *** springs reduced impact forces at the tip of the endoscope through their inherent *** the same time,feeding back the estimated force resulted in a stable tendon force control and a tunable endoscope joint control:Zero torque control effectively reduced the external forces,while the endoscope joint showed the expected stiffness in impedance *** results show that antagonistic series elastic actuation is a promising concept for endoscope joint actuation and that it can lead towards safer robot–tissue interactions in surgical robotics.

关键词： Minimally invasive surgery RAMIS Robot-assisted surgery Haptic feedback Force control Tendon-driven robotics

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A methodology to determine the elastic properties of anisotropic rocks from a single uniaxial compression test

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第6期11卷 1166-1183页

作者： Morteza Nejati Marie Luise Texas Dambly Martin OSaar Department of Earth Sciences ETH ZurichZurichSwitzerland Geothermal Energy and Geofluids Department of Earth SciencesETH ZurichZurichSwitzerland

This paper introduces a new methodology to measure the elastic constants of transversely isotropic rocks from a single uniaxial compression *** first give the mathematical proof that a uniaxial compression test provides only four independent strain *** a result,the exact determination of all five independent elastic constants from only one test is not *** approximate determination of the Young’s moduli and the Poisson’s ratios is however practical and efficient when adding the Saint-Venant relation as the fifth *** formulae are then developed to calculate both secant and tangent definitions of the five elastic constants from a minimum of four strain *** results of this new methodology applied on three granitic samples demonstrate a significant stress-induced nonlinear behavior,where the tangent moduli increase by a factor of three to four when the rock is loaded up to 20 *** static elastic constants obtained from the uniaxial compression test are also found to be significantly smaller than the dynamic ones obtained from the ultrasonic measurements.

关键词： Transversely isotropic rock Elastic constants Young’s modulus Poisson’s ratio Seismic anisotropy Uniaxial compression Granite

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Atomic scale memristive photon source

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Light(Science & Applications) 2022年第7期11卷 1414-1422页

作者： Bojun Cheng Till Zellweger Konstantin Malchow Xinzhi Zhang Mila Lewerenz Elias Passerini Jan Aeschlimann Ueli Koch Mathieu Luisier Alexandros Emboras Alexandre Bouhelier Juerg Leuthold ETH Zurich Institute of Electromagnetic FieldsZurich 8092Switzerland Laboratoire Interdisciplinaire Carnot de Bourgogne UMR 6303 CNRSUniversitéde Bourgogne Franche-ComtéDijon 21078France ETH Zurich Integrated Systems LaboratoryZurich 8092Switzerland

Memristive devices are an emerging new type of devices operating at the scale of a few or even single *** are currently used as storage elements and are investigated for performing in-memory and neuromorphic *** these devices,Ag/amorphous-SiO_(x)/Pt memristors are among the most studied systems,with the electrically induced filament growth and dynamics being thoroughly investigated both theoretically and *** this paper,we report the observation of a novel feature in these devices:The appearance of new photoluminescent centers in SiO_(x) upon memristive switching,and photon emission correlated with the conductance *** observation might pave the way towards an intrinsically memristive atomic scale light source with applications in neural networks,optical interconnects,and quantum communication.

关键词： photon thoroughly amorphous

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