Las caras ocultas y las caras visibles de la evaluación: Notas para la investigación de la evaluación del aprendizaje como actividad humana

There have been several studies made on new diversity antennas for the mobile telephones. The main idea has been to have a built-in (planar) antenna working together with the conventional external. The purpose of this paper is to examine the concept of diversity further and to design two different concepts, one with two external antennas and one with an external antenna combined with an in-built. For evaluation a MATLAB program developed by the Center for Personkommunikation, CPK, in Aalborg, Denmark, is used. Given the radiation pattern from each antenna and the incoming field distribution from the environment, this program calculates the diversity performance of the system assuming that selection combining is used to combine the signalsQCR 20181217</p

Antenna diversity for mobile telephones

There have been several studies made on new diversity antennas for the mobile telephones. The main idea has been to have a built-in (planar) antenna working together with the conventional external. The purpose of this paper is to examine the concept of diversity further and to design two different concepts, one with two external antennas and one with an external antenna combined with an in-built. For evaluation a MATLAB program developed by the Center for Personkommunikation, CPK, in Aalborg, Denmark, is used. Given the radiation pattern from each antenna and the incoming field distribution from the environment, this program calculates the diversity performance of the system assuming that selection combining is used to combine the signalsQCR 20181217</p

Distribution of the Peruvian Plantcutter Phytotoma raimondii (Passeriformes: Cotingidae)

The Peruvian Plantcutter, <em>Phytotoma raimondii</em> Taczanowski, 1883, is a restricted-range species endemic to coastal northern Peru. Historically its range is given from Tumbes in the extreme north-western Peru, south to the northern part of Lima Department. Although an increasing amount of information on the Peruvian Plantcutter exists, from historical records to new locations, it has remained dispersed, sometimes unverified, not systematized, and largely unpublished. A careful revision of museum collections as well as published and unpublished records results in a total of 53 sites where the species has been recorded and that represent the present knowledge of the distribution of the species