Microwave dielectric properties of MO -La2O3-TiO2 (M = Ca, Sr, Ba) ceramics

Single-phase polycrystalline ceramics in the MO-La2O3-Ti02 (M = Ca, Sr, Ba) system, such as cation-deficient hexagonal perovskites CaLa4Ti4O15, SrLa4Ti4O15, BaLa4Ti4O15, and Ca2La4Ti5O18 and the orthorhombic phases CaLa4Ti5O17 and CaLa8Ti9O31, were prepared through the solid-state ceramic route. The phases and structure of the ceramics were analyzed through x-ray diffraction and scanning electron microscopy. The microwave dielectric properties of the ceramics were studied using a network analyzer. The investigated ceramics show high Er in the range 42 to 54, high quality factors with Q x f in the range 16,222 to 50,215 GHz, and low Tf in the range -25 to +6 ppm3/°C. These high dielectric constant materials with high Q x f up to 50,215 GHz are suitable for applications where narrow bandwidth and extremely low insertion loss is necessary, especially at frequencies around 1.9 GHz

Interpretation of the anisotropy of M MO radiation in slow I on Au collisions

A comparison between experimental and calculated spectral shape and energy dependence of the M MO x-ray anisotropy in heavy-ion collisions of I on Au is presented. The calculation is performed within the kinematic-dipole model of anisotropy using MO x-rays determined from SCF relativistic correlation diagrams.

The electronic structure of the group 6 oxyanions [MO_4]^2-, where M = Cr, Mo, W, and element 106

The electronic structure of the group 6 oxyanions [MO_4]^2-, where M = Cr, Mo, W, and element 106 have been calculated using the Dirac-Slater Discrete Variational method. Results of the calculations show a relative decrease in the metal-oxygen bond strengths for the [E106O_4]^2- ion in the solid state compared to that for the [WO_4]^2- anion. Calculated energies of the electronic charge-transfer transitions are indicative of a strong possible luminescence of [El06O_4]^2- in the blue-violet area. In solutions [El06O_4]^2- will be the most stable ion out of the entire series. Estimated reduction potential E^0 (El06O^2-_4/E106O^3-_4) equal to -1.60V shows only a slightly increased stability of the +6 oxidation state for element 106 in comparison with W.

??C??mo nos gusta bailar!

Se presenta experiencia educativa que propone la m??sica y la danza como medio de expresi??n del alumnado. Se realiza en el CEIP Ntra. Sra. del Rosario en Chimeneas, Granada. Los objetivos son: conocer algunas de las manifestaciones art??sticas y culturales de su entorno m??s cercano; coordinar las diferentes partes del esquema corporal; desarrollar la autoestima y la confianza en s?? mismo; desarrollar una autoestima progresiva; intervenir de forma directa en las manifestaciones art??sticas de su localidad.

C??mo tratar un tema transversal desde el proyecto educativo hasta la programaci??n did??ctica

Unidades did??cticas dirigidas a los alumnos de Educaci??n Infantil y Primaria. El tema transversal abordado es la Educaci??n para la Igualdad y viene justificado por la presencia de un n??mero importante de ni??os y ni??as de raza gitana, magreb??es y trabajadores temporales que conviven en los pueblos y campo de Cartagena (Murcia). El objetivo de estas unidades es modificar y desarrollar actitudes personales centradas en los valores de: tolerancia, responsabilidad y solidaridad. Antes de abordar las unidades did??cticas, los autores de este trabjo exponen los objetivos generales del centro y el de las dos etapas a los que va dirigido as?? como tres esquemas correspondientes a los objetivos generales contemplados en el Proyecto Educativo de Centro.

??Qui??nes son los superdotados y c??mo identificarlos?

El trabajo ha formado parte del Programa S??neca de Investigaci??n Cient??fico y Desarrollo Tecnol??gico HUM 96/23 (1996-1998), subvencionado por la Consejer??a de Cultura y Educaci??n de la Comunidad Aut??noma de la Regi??n de Murcia