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H. Cifuentes,F. Montero-Chacón,J. Galán,J. Cabezas,A. Martínez-De la Concha 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.6
This paper presents a general procedure based on fracture mechanics models in order to analyze the level of crack-ing and structural safety in reinforced concrete elements at early ages, depending on the stripping time. Our proce-dure involves the development of a thermo-mechanical numerical model based on the finite element method that accounts for the change in the mechanical properties of concrete with time. Moreover, fracture mechanisms are analyzed by means of a material damage model, which is characterized via specific experimental results obtained for standard specimens and notched beams under three-point bending testing. The loading conditions are both thermal and mechanical, and are obtained from the hydration process for a given concrete dosage. The presented methodol-ogy allows for the determination of the optimal stripping time, whereas it helps assessing the analysis of the cracking and the stress states of the elements under consideration. A practical application, namely the analysis of a retaining wall, is used to validate our methodology, showing its suitability in engineering practice.
Large superconformal near-horizons from M-theory
Kelekci, Ö,.,Lozano, Y.,Montero, J.,Ó,Colgá,in, E.,Park, M. American Physical Society 2016 Physical review. D Vol.93 No.8
<P>We report on a classification of supersymmetric solutions to 11D supergravity with SO(2, 2) x SO(3) isometry, which are AdS/CFT dual to 2D CFTs with N = (0, 4) supersymmetry. We recover the Maldacena, Strominger, Witten near-horizon with small superconformal symmetry and identify a class of AdS(3) x S-2 x S-2 x CY2 geometries with emergent large superconformal symmetry. This exhausts known compact geometries. Compactification of M-theory on CY2 results in a vacuum of 7D supergravity with large superconformal symmetry, providing a candidate near-horizon for an extremal black hole and a potential new setting to address microstates.</P>
Perimeter leakage current in polymer light emitting diodes
Germà Garcia-Belmonte,José M. Montero,Yassid Ayyad-Limonge,Eva M. Barea,Juan Bisquert,Henk J. Bolink 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Observation of leakage current paths through the device perimeter in standard poly(phenylene vinylene)-based light-emitting devices is reported. Perimeter leakage currents govern the diode performance in reverse and low positive bias and exhibit an ohmic character. Current density correlates with the perimeter-to-area ratio thus indicating that leakage currents are mainly confined on polymer regions in the vicinity of metallic contact limits (device perimeter). Observation of leakage current paths through the device perimeter in standard poly(phenylene vinylene)-based light-emitting devices is reported. Perimeter leakage currents govern the diode performance in reverse and low positive bias and exhibit an ohmic character. Current density correlates with the perimeter-to-area ratio thus indicating that leakage currents are mainly confined on polymer regions in the vicinity of metallic contact limits (device perimeter).