Suchergebnisse

The authors of this research acknowledge financial support by the Spanish Ministerio de Ciencia y Tecnologia, Agencia Estatal de Investigacion and Fondos Europeos de Desarrollo Regional (FEDER) via project PID2020-114594GB-C21. The authors also acknowledge partial support from projects FEDER-US-1256951, Junta de Andalucda P18-FR-1422, CEI-3-FQM331, B-FQM-322-UGR20, Netmeet-Data: Ayudas Fundacin BBVA a equipos de investigacin cientifica 2019, and Contratacion de Personal Investigador Doctor (Convocatoria 2019) 43 Contratos Capital Humano Linea 2. Paidi 2020, supported by the European Social Fund and Junta de Andalucia. The first author was also partially supported by the IMAG-Maria de Maeztu grant CEX2020-001105-M/AEI/10.13039/501100011033. ; In this paper we propose a general methodology for the optimal automatic routing of spatial pipelines motivated by a recent collaboration with Ghenova, a leading Naval Engineering company. We provide a minimum cost multicommodity network flow based model for the problem incorporating all the tech-nical requirements for a feasible pipeline routing. A branch-and-cut approach is designed and different matheuristic algorithms are derived for solving efficiently the problem. We report the results of a battery of computational experiments to assess the problem performance as well as a case study of a real-world naval instance provided by our partner company. ; Spanish Government ; European Commission ; Agencia Estatal de Investigacion ; European Commission PID2020-114594GB-C21 ; Junta de Andalucda P18-FR-1422 CEI-3-FQM331 B-FQM-322-UGR20 ; Netmeet-Data: Ayudas Fundacin BBVA a equipos de investigacin cientifica 2019 ; European Social Fund (ESF) ; Junta de Andalucia ; IMAG-Maria de Maeztu grant CEX2020-001105-M/AEI/10.13039/501100011033 ; FEDER-US-1256951

Herein we describe a distorted ribbon-shaped nanographene exhibiting unprecedented combination of optical properties in graphene-related materials, namely upconversion based on two-photon absorption (TPA-UC) together with circularly polarized luminescence (CPL). The compound is a graphene molecule of ca. 2 nm length and 1 nm width with edge defects that promote the distortion of the otherwise planar lattice. The edge defects are an aromatic saddle-shaped ketone unit and a [5]carbohelicene moiety. This system is shown to combine two-photon absorption and circularly polarized luminescence and a remarkably long emission lifetime of 21.5 ns. The [5]helicene is responsible for the chiroptical activity while the push–pull geometry and the extended network of sp2 carbons are factors favoring the nonlinear absorption. Electronic structure theoretical calculations support the interpretation of the results. ; This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (ERC-2015-STG-677023). We also thank the Ministerio de Economía y Competitividad (MINECO, Spain) (CTQ2015-70283-P, CTQ2014-53598-R, MAT2014-54231-C4-1P, FIS2016-77578-R) and the "Unidad de Excelencia Química Aplicada a Biomedicina y Medioambiente (UGR)". A. G. C., C. S. S. and C. M. C. acknowledge funding from MINECO (Spain) for RyC-2013-12943, IJCI-2014-19291 and BES-2016-076371 contracts, respectively. I. R. M. thanks UGR (Spain) for a postdoctoral scholarship. I. M. and E. M. thank the Fundação para a Ciência e a Tecnologia for financial support (IF/00759/2013 and post-doc grant SFRH/BPD/75782/2011). We thank the CSIRC-Alhambra for supercomputing facilities.