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All the organisms have developed defensive against different (parasites, harsh environmental conditions or contaminants) to which they should face in their environments. To deal with these selective factors, birds have developed defensive mechanisms such as the uropygial gland, which produces a secretion acting as a physico-chemical defensive barrier against a high diversity of ectoparasites and p

Alejo Carpentier (1904-1980) is one of the most distinguished writers in Latin American literature and numerous studies have delved into his literary works. However, very little is known about his private life and family background apart from the facts that he chose to reveal about himself. Indeed, several of these “facts” have turned out to be false. This thesis sets out to examine whether a hidd

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En este trabajo se analizan ocurrencias de Pretérito Perfecto Compuesto (PPC) en entrevistas a personalidades del quehacer político y cultural de España y México. La elección del PPC en estos dialectos a menudo es caracterizada, según el caso, por codificar situaciones imperfectivas o situaciones que implican relevancia actual, en contraposición del Pretérito Perfecto Simple que implica situacioneThis paper analyzes occurrences of the Spanish compound past [“present perfect”, PPC] in interviews to personalities of the political and cultural life of Mexico and Spain. The choice of the PPC in theses dialects is often characterized by its codification of imperfective situations or situations that denote current relevance depending on the case, thus countering the Simple Past that comprises si

Kommunikationsgruppen forskar och undervisar inom kommunikationsområdet, med fokusering på såväl transmissionskanalers egenskaper som hur information överförs effektivt över dessa. En dominerande del av verksamheten rör olika typer av trådlös kommunikation. Huvudsakliga forskningsområden innefattar informationsteori, kanalmätning, kanalmodellering, algoritmutveckling för digitala sändare och mottaThe Communications Engineering Research group work with wireless communication and properties of transmission channels. A dominating part of the activities deals with different forms of wireless communications. The main areas of work are information theory, channel measurements, channel modeling, algorithm development for digital transmitters and receivers and telecommunication theory.

This work presents a new approach to the autotuning strategy for controlling pH in raceway reactors, based on classical relay-based autotuning principles. A relay applied to reference method is proposed that allows seamless integration into existing control loops without the need for manual recalibration across seasons or operator intervention. Two different models were identified: first-order wit

An increase of the cases of viral meningoencephalitis was reported in our country from October to December, 1995. 23 faeces specimens were received from 2 provinces aimed at obtaining the viral isolation by their inoculation in cell culture and in newborn mice at the same time in order to compare the sensitivity of both systems in isolation. A higher number of isolations was obtained in cell cultu