Semisimple types for p -adic classical groups

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Las yeserías del Patio del Sol del Real Alcázar de Sevilla: Caracterización y cronología

This research involves an interdisciplinary study aimed at determining the origin of the Mudéjar plasterwork of the Patio of the Sun in the Royal Alcázar of Seville. A double methodology has been used involving, on one hand, a synthetic history based on the analysis and correlation of the graphic and historiographic documentation of this Patio and, on the other hand, a characterization of the plasterwork material using XRF, XRD, radiocarbon dating of vegetable fibres, and the gravimetric analysis of the water-insoluble residue. Combining the results from the chemical and mineralogical compositions and the percentage of insoluble residue performed on three plasterwork samples with different textures, from C-14 dating of one sample, and from historical and document sources has allowed us to identify and delimit the original Mudéjar zones from the 13th and 14th centuries from the areas restored in the 20th century.En esta investigación se realiza un estudio interdisciplinario que tiene como finalidad discernir la originalidad de las yeserías mudéjares del Patio del Sol del Real Alcázar de Sevilla. Para ello se ha trabajado con una doble metodología: una histórica sintética, basada en el análisis y relación de la documentación gráfica e historiográfica existente de este Patio, y otra de caracterización del material de las yeserías, mediante las técnicas instrumentales de FRX, DRX, datación por radiocarbono de fibras vegetales y el análisis gravimétrico del residuo insoluble en agua. La comparación de la composición química, mineralógica y porcentaje de residuo insoluble realizado a tres muestras de yeserías en las que se han observado distintas texturas, sumado a la datación mediante C-14 efectuada a una de ellas, junto al conocimiento de las fuentes históricas y documentales, han permitido identificar y acotar las zonas originales mudéjares de los siglos XIII y XIV y las restauradas del siglo XX

Geoarcheologicalprospection of megalithic structures using Ground Penetrating Radar (Almendralejo, Spain)

In 1980, in Almendralejo, Spain, it was discovered the Tomb of Huerta Montero, a megalithic funerary monument, the best preserved in the Iberian Peninsula, dating from the Chalcolithic (Copper Age, about 4650 BC). According to the opinion of archaeologists, it is quite probable that there are similar buried monuments in the vicinity of the known tomb. This suspicion led to the geophysical study, carried out with the aim of identifying new structures in the vicinity of the necropolis discovered. The choice of geophysical method it was the GPR, because it is a non-invasive technique, accurate and rapid in its implementation. The results obtained allow us to conclude that there may be a structure of circular shape, with a diameter of about 7 m which may to correspond to a funeral monument as there are a few meters, with a temporal thickness ranging between 13 and 21 ns deep. In the northern part of the structure there are two protrusions that may match an entry in the building or even the rest of the tunnel entrance

Valence change of praseodymium in Pr0.5Ca0.5CoO3 investigated by x-ray absorption spectroscopy

X-ray absorption spectroscopy measurements in Pr0.5Ca0.5CoO3 were performed at the Pr M4,5, Pr L3, and Ca L2,3 absorption edges as a function of temperature below 300 K. Ca spectra show no changes down to 10 K while a noticeable thermally dependent evolution takes place at the Pr edges across the metal-insulator transition. Spectral changes are analyzed by different methods, including multiple scattering simulations, which provide quantitative details on an electron loss at Pr 4f orbitals. We conclude that in the insulating phase a fraction [15(+5)%] of Pr3+ undergoes a further oxidation to adopt a hybridized configuration composed of an admixture of atomic-like 4f1 states (Pr4+) and f- symmetry states on the O 2p valence band (Pr3+L states) indicative of a strong 4f- 2p interaction.Comment: 19 pages (.doc), 4 figures, Phys. Rev. B, in pres

Enfermedad de Jacob asociada con el síndrome de disfunción de la articulación temporomandibular: presentación de un caso

La enfermedad de Jacob se describe como una entidad infrecuente en la cual se establece una formación articular sinovial entre una apófisis coronoide mandibular elongada y el hueso malar homolateral. El Síndrome de disfunción de la articulación temporomandibular (ATM) ha sido postulado como posible factor etiológico del alargamiento este proceso coronoideo. Presentamos el caso de una mujer de 23 años con un desplazamiento discal de ATM de larga evolución y limitación de la apertura oral, que desarrolló una asimetría malar progresiva. La paciente fue sometida a tratamiento quirúrgico mediante una coronoidectomía intraoral y una artroscopia de la ATM homolateral en el mismo acto operatorio. El diagnóstico histológico de la apófisis coronoide examinada fue de exóstosis óseo-cartilaginosa con presencia de fibrocartílago articular en dicha formación. A pesar de la baja prevalencia de esta patología, debe ser considerada como un posible diagnóstico en aquellos pacientes con limitación progresiva de la apertura oral de larga evolución, si bien en ocasiones puede acompañarse de una disfunción articular crónica concomitante como posible causa de la misma.Jacob´s disease is regarded a rare condition in which a joint formation is established between an enlarged mandibular coronoid process and the inner aspect of the zygomatic body. Chronic temporomandibular joint (TMJ) disk displacement has been proposed as etiological factor of coronoid process enlargement. We present a 23-year-old woman with long-standing TMJ dysfunction and restricted interincisal opening, who developed a progressive zygomatic assymetry. The patient underwent treatment by intraoral coronoidectomy and homolateral TMJ arthroscopy in the same surgery. The histopathological diagnosis of the coronoid sample was cartilage-capped exostoses with presence of articular fibrous cartilage. Although the low prevalence of this entity, it should be considered as a possible diagnosis in patients with progressive limitation of mouth opening, although a TMJ syndrome may be present as a cause of this entity

Prospecção geoarqueológica de estruturas megalíticas com recurso a georadar (Almendralejo, Espanha)

In 1980, in Almendralejo, Spain, it was discovered the Tomb of Huerta Montero, a megalithic funerary monument, the best preserved in the Iberian Peninsula, dating from the Chalcolithic (Copper Age, about 4650 BC). According to the opinion of archaeologists, it is quite probable that there are similar buried monuments in the vicinity of the known tomb. This suspicion led to the geophysical study, carried out with the aim of identifying new structures in the vicinity of the necropolis discovered. The choice of geophysical method it was the GPR, because it is a non-invasive technique, accurate and rapid in its implementation. The results obtained allow us to conclude that there may be a structure of circular shape, with a diameter of about 7 m which may to correspond to a funeral monument as there are a few meters, with a temporal thickness ranging between 13 and 21 ns deep. In the northern part of the structure there are two protrusions that may match an entry in the building or even the rest of the tunnel entrance

Mineral equilibria and thermodynamic uncertainties in the geothermometrical characterisation of carbonate geothermal systems of low temperature. The case of the Alhama-Jaraba system (Spain)

Geothermometrical characterisation of low-temperature, carbonate-evaporitic geothermal systems is usually hampered by the lack of appropriate mineral equilibria to successfully use most of the classical geothermometers and/or by the thermodynamic uncertainties affecting some of the most probable mineral equilibria in low temperature conditions. This situation is further hindered if the thermal waters are additionally affected by secondary processes (e.g., CO2 loss) during their ascent to surface. All these problems cluster together in the low-temperature Alhama-Jaraba thermal system, hosted in carbonate rocks, with spring temperatures about 30 °C and waters of Ca-Mg−HCO3/SO4 type. This system, one of the largest naturally flowing (600 L/s) low temperature thermal systems in Europe, is used in this paper as a suitable frame to assess the problems in the application of chemical geothermometrical techniques (classical geothermometers and geothermometrical modelling) and to provide a methodology that could be used in this type of geothermal system or in potential CO2 storage sites in similar aquifers. The results obtained have shown that the effects of the secondary processes can be avoided by selecting the samples unaffected by such processes and, therefore, representative of the conditions at depth, or by applying existing methodologies to reconstruct the original composition, as is usually done for medium to high temperature systems. The effective mineral equilibria at depth depend on the temperature, the residence time and the specific lithological/mineralogical characteristics of the system studied. In the present case, the mineral equilibria on which classical cation geothermometers are based have not been attained. The low proportion of evaporitic minerals in the hosting aquifer prevents the system from reaching anhydrite equilibrium, otherwise common in carbonate-evaporitic systems and necessary for the specific SO4-F geothermometer or the specially reliable quartz (or chalcedony) – anhydrite equilibrium in the geothermometrical modelling of these geothermal systems. Under these circumstances, the temperature estimation must rely on quartz (or chalcedony), clay minerals and, especially, calcite and dolomite. However, clay minerals and dolomite present important thermodynamic uncertainties related to possible variations in composition or crystallinity degree for clays and order/disorder degree for dolomite. To deal with these problems, a sensitivity analysis to the thermodynamic data for clay minerals has been carried out, comparing the results obtained when considering different solubility data. The uncertainties associated with dolomite have been addressed by reviewing the solubility data available for dolomites with different order degrees and performing specific calculations for the order degree of the dolomite in the aquifer. This approach can be used to find the most adequate dolomite thermodynamic data for the system under consideration, including medium-high temperature geothermal systems. Finally, the temperature estimation of the Alhama-Jaraba waters in the deep reservoir has been obtained from simultaneous equilibria of quartz, calcite, partially disordered dolomite and some aluminosilicate phases. The obtained value of 51 ± 14 °C is within the uncertainty range normally affecting this type of estimations and is coherent with independent estimations from geophysical data