Conjunctive queries with negation over DL-Lite: a closer look

While conjunctive query (CQ) answering over DL-Lite has been studied extensively, there have been few attempts to analyse CQs with negated atoms. This paper deepens the study of the problem. Answering CQs with safe negation and CQs with a single inequality over DL-Lite with role inclusions is shown to be undecidable, even for a fixed TBox and query.Without role inclusions, answering CQs with one inequality is P-hard and with two inequalities CoNP-hard in data complexity

Rastrojo de maíz: producción teórica de etanol lignocelulósico en relación a la fecha de siembra

El efecto de la fecha de siembra sobre el rendimiento y la calidad bioenergética del rastrojo de maíz (Zea mays L.) es poco conocido. Este recurso está siendo reconsiderado debido a que no compite con los alimentos y tiene un bajo costo. El objetivo fue determinar el efecto de la fecha de siembra en la producción teórica de etanol del rastrojo en híbridos comerciales de maíz. Cuatro híbridos fueron evaluados en dos fechas de siembra en un diseño de bloques completos aleatorizados con arreglo factorial y tres repeticiones. Se analizaron variables de rendimiento y calidad bioenergética. Además, se determinaron mediante regresión lineal los perfiles verticales de distribución del rendimiento (tn/ha) y del rendimiento en etanol teórico potencial (L/ha), dividiendo al rastrojo en estratos de 20 cm desde la base al ápice. La fecha de siembra tardía fue superior a la temprana. Produjo un mayor rendimiento de rastrojo (11,32 vs. 9,37 tn/ha) y en etanol teórico potencial (3,78 vs. 2,47 mil L/ha). Hubo un aporte decreciente de cada estrato desde la base hasta el ápice de la planta. No obstante, la fecha de siembra tardía produjo mayor acumulación de biomasa por estrato, aportando mayor remanente al suelo ante una misma altura de corte.Trabajo presentado por el Instituto de Investigación Agropecuaria, Ambiente y Salud (IIPAAS

Tratado apologetico en fauor de la Cathedra de San Hierotheo en Segouia : historias e historiadores de estos Reynos... : contra el discurso historico que saco a luz D. Gaspar Ibañez de Segouia y Peralta...

Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2009-2010Sign. : a-d\p4\s, A-Z\p4\s, 2A-2G\p4\s

High-pressure optical absorption in InN: Electron density dependence in the wurtzite phase and reevaluation of the indirect band gap of rocksalt InN

We report on high-pressure optical absorption measurements on InN epilayers with a range of free-electron concentrations (5×1017–1.6×1019 cm−3) to investigate the effect of free carriers on the pressure coefficient of the optical band gap of wurtzite InN. With increasing carrier concentration, we observe a decrease of the absolute value of the optical band gap pressure coefficient of wurtzite InN. An analysis of our data based on the k·p model allows us to obtain a pressure coefficient of 32 meV/GPa for the fundamental band gap of intrinsic wurtzite InN. Optical absorption measurements on a 5.7-μm-thick InN epilayer at pressures above the wurtzite-to-rocksalt transition have allowed us to obtain an accurate determination of the indirect band gap energy of rocksalt InN as a function of pressure. Around the phase transition (∼15 GPa), a band gap value of 0.7 eV and a pressure coefficient of ∼23 meV/GPa are obtained. ©2012 American Physical SocietyThis work was supported by the Spanish Ministry of Science and Innovation through Project No. MAT2010-16116.Ibáñez, J.; Segura, A.; García-Domene, B.; Oliva, R.; Manjón Herrera, FJ.; Yamaguchi, T.; Nanishi, Y.... (2012). High-pressure optical absorption in InN: Electron density dependence in the wurtzite phase and reevaluation of the indirect band gap of rocksalt InN. Physical Review B. 86:35210-1-35210-5. https://doi.org/10.1103/PhysRevB.86.035210S35210-135210-586Wu, J. (2009). When group-III nitrides go infrared: New properties and perspectives. Journal of Applied Physics, 106(1), 011101. doi:10.1063/1.3155798Ueno, M., Yoshida, M., Onodera, A., Shimomura, O., & Takemura, K. (1994). Stability of the wurtzite-type structure under high pressure: GaN and InN. Physical Review B, 49(1), 14-21. doi:10.1103/physrevb.49.14Uehara, S., Masamoto, T., Onodera, A., Ueno, M., Shimomura, O., & Takemura, K. (1997). Equation of state of the rocksalt phase of III–V nitrides to 72 GPa or higher. Journal of Physics and Chemistry of Solids, 58(12), 2093-2099. doi:10.1016/s0022-3697(97)00150-9Pinquier, C., Demangeot, F., Frandon, J., Chervin, J.-C., Polian, A., Couzinet, B., … Maleyre, B. (2006). Raman scattering study of wurtzite and rocksalt InN under high pressure. Physical Review B, 73(11). doi:10.1103/physrevb.73.115211Ibáñez, J., Manjón, F. J., Segura, A., Oliva, R., Cuscó, R., Vilaplana, R., … Artús, L. (2011). High-pressure Raman scattering in wurtzite indium nitride. Applied Physics Letters, 99(1), 011908. doi:10.1063/1.3609327Li, S. X., Wu, J., Haller, E. E., Walukiewicz, W., Shan, W., Lu, H., & Schaff, W. J. (2003). Hydrostatic pressure dependence of the fundamental bandgap of InN and In-rich group III nitride alloys. Applied Physics Letters, 83(24), 4963-4965. doi:10.1063/1.1633681Franssen, G., Gorczyca, I., Suski, T., Kamińska, A., Pereiro, J., Muñoz, E., … Svane, A. (2008). Bowing of the band gap pressure coefficient in InxGa1−xN alloys. Journal of Applied Physics, 103(3), 033514. doi:10.1063/1.2837072Kamińska, A., Franssen, G., Suski, T., Gorczyca, I., Christensen, N. E., Svane, A., … Georgakilas, A. (2007). Role of conduction-band filling in the dependence of InN photoluminescence on hydrostatic pressure. Physical Review B, 76(7). doi:10.1103/physrevb.76.075203Shan, W., Walukiewicz, W., Haller, E. E., Little, B. D., Song, J. J., McCluskey, M. D., … Stall, R. A. (1998). Optical properties of InxGa1−xN alloys grown by metalorganic chemical vapor deposition. Journal of Applied Physics, 84(8), 4452-4458. doi:10.1063/1.368669Millot, M., Geballe, Z. M., Yu, K. M., Walukiewicz, W., & Jeanloz, R. (2012). Red-green luminescence in indium gallium nitride alloys investigated by high pressure optical spectroscopy. Applied Physics Letters, 100(16), 162103. doi:10.1063/1.4704367Franssen, G., Suski, T., Perlin, P., Teisseyre, H., Khachapuridze, A., Dmowski, L. H., … Schaff, W. (2006). Band-to-band character of photoluminescence from InN and In-rich InGaN revealed by hydrostatic pressure studies. Applied Physics Letters, 89(12), 121915. doi:10.1063/1.2356994Ibáñez, J., Segura, A., Manjón, F. J., Artús, L., Yamaguchi, T., & Nanishi, Y. (2010). Electronic structure of wurtzite and rocksalt InN investigated by optical absorption under hydrostatic pressure. Applied Physics Letters, 96(20), 201903. doi:10.1063/1.3431291Cuscó, R., Ibáñez, J., Alarcón-Lladó, E., Artús, L., Yamaguchi, T., & Nanishi, Y. (2009). Raman scattering study of the long-wavelength longitudinal-optical-phonon–plasmon coupled modes in high-mobility InN layers. Physical Review B, 79(15). doi:10.1103/physrevb.79.155210Cuscó, R., Alarcón-Lladó, E., Ibáñez, J., Yamaguchi, T., Nanishi, Y., & Artús, L. (2009). Raman scattering study of background electron density in InN: a hydrodynamical approach to the LO-phonon–plasmon coupled modes. Journal of Physics: Condensed Matter, 21(41), 415801. doi:10.1088/0953-8984/21/41/415801Syassen, K. (2008). Ruby under pressure. High Pressure Research, 28(2), 75-126. doi:10.1080/08957950802235640Wu, J., Walukiewicz, W., Shan, W., Yu, K. M., Ager, J. W., Li, S. X., … Schaff, W. J. (2003). Temperature dependence of the fundamental band gap of InN. Journal of Applied Physics, 94(7), 4457-4460. doi:10.1063/1.1605815Wu, J., Walukiewicz, W., Li, S. X., Armitage, R., Ho, J. C., Weber, E. R., … Jakiela, R. (2004). Effects of electron concentration on the optical absorption edge of InN. Applied Physics Letters, 84(15), 2805-2807. doi:10.1063/1.1704853Wu, J., Walukiewicz, W., Shan, W., Yu, K. M., Ager, J. W., Haller, E. E., … Schaff, W. J. (2002). Effects of the narrow band gap on the properties of InN. Physical Review B, 66(20). doi:10.1103/physrevb.66.201403Rinke, P., Winkelnkemper, M., Qteish, A., Bimberg, D., Neugebauer, J., & Scheffler, M. (2008). Consistent set of band parameters for the group-III nitrides AlN, GaN, and InN. Physical Review B, 77(7). doi:10.1103/physrevb.77.075202Furthmüller, J., Hahn, P. H., Fuchs, F., & Bechstedt, F. (2005). Band structures and optical spectra of InN polymorphs: Influence of quasiparticle and excitonic effects. Physical Review B, 72(20). doi:10.1103/physrevb.72.205106Serrano, J., Rubio, A., Hernández, E., Muñoz, A., & Mujica, A. (2000). Theoretical study of the relative stability of structural phases in group-III nitrides at high pressures. Physical Review B, 62(24), 16612-16623. doi:10.1103/physrevb.62.16612Christensen, N. E., & Gorczyca, I. (1994). Optical and structural properties of III-V nitrides under pressure. Physical Review B, 50(7), 4397-4415. doi:10.1103/physrevb.50.4397Duan, M.-Y., He, L., Xu, M., Xu, M.-Y., Xu, S., & Ostrikov, K. (Ken). (2010). Structural, electronic, and optical properties of wurtzite and rocksalt InN under pressure. Physical Review B, 81(3). doi:10.1103/physrevb.81.03310

Multifield Dynamics in Higgs-otic Inflation

In Higgs-otic inflation a complex neutral scalar combination of the $h^0$ and $H^0$ MSSM Higgs fields plays the role of inflaton in a chaotic fashion. The potential is protected from large trans-Planckian corrections at large inflaton if the system is embedded in string theory so that the Higgs fields parametrize a D-brane position. The inflaton potential is then given by a DBI+CS D-brane action yielding an approximate linear behaviour at large field. The inflaton scalar potential is a 2-field model with specific non-canonical kinetic terms. Previous computations of the cosmological parameters (i.e. scalar and tensor perturbations) did not take into account the full 2-field character of the model, ignoring in particular the presence of isocurvature perturbations and their coupling to the adiabatic modes. It is well known that for generic 2-field potentials such effects may significantly alter the observational signatures of a given model. We perform a full analysis of adiabatic and isocurvature perturbations in the Higgs-otic 2-field model. We show that the predictivity of the model is increased compared to the adiabatic approximation. Isocurvature perturbations moderately feed back into adiabatic fluctuations. However, the isocurvature component is exponentially damped by the end of inflation. The tensor to scalar ratio varies in a region $r=0.08-0.12$, consistent with combined Planck/BICEP results.Comment: 35 pages, 11 figure

Bibliografía de la Sta. Iglesia Catedral de Cartagena en Murcia : [(1450-1923)]

En la cub.: 192

Overlapping of acoustic bandgaps using fractal geometries

The transmission of acoustic waves in a fractal distribution of rigid scatterers embedded in air is reported in this work. The Sierpinsky fractal is used to produce a compact small device containing several periodicities, therefore the fractal distribution contains several finite sonic crystals. The attenuation band produced by the fractal distribution results from the sum of the Bragg peaks of each periodicity. On the other hand, bandgaps of sonic crystal depend on the well-known filling fraction, thus the radii of the scatterers in the fractal distribution has been optimized using genetic algorithm in order to overlap the bandgaps of each periodicity obtaining a wide and full attenuation band.This work was supported by MCI (Spanish Government) and FEDER funds, under Grant Nos. MAT2009-09438 and MTM2009-14483-C02-02. The authors would like to thank Prof. K. ATTENBOROUGH and Dr. E. A. SANCHEZ-PEREZ for their suggestions and for the revision of the manuscript.Castiñeira Ibáñez, S.; Romero García, V.; Sánchez Pérez, JV.; García-Raffi, LM. (2010). Overlapping of acoustic bandgaps using fractal geometries. EPL. 92(2):240071-240073. doi:10.1209/0295-5075/92/24007S24007124007392

Phenomenological constraints on SUSY SU(5) GUTs with non-universal gaugino masses

We study phenomenological aspects of supersymmetric SU(5) grand unified theories with non-universal gaugino masses. For large tan beta, we investigate constraints from the requirement of successful electroweak symmetry breaking, the positivity of stau mass squared and the b to s gamma decay rate. In the allowed region, the nature of the lightest supersymmetric particle is determined. Examples of mass spectra are given. We also calculate loop corrections to the bottom mass due to superpartners.Comment: 10 pages, 2 figures (8 eps files), uses REVTeX. Replaced to match the version to be published in PRD: minor corrections and addition