Experimental study on nitrification in a submerged aerated biofilter

The aim of the present work was to evaluate the performance of a semi-pilot scale BAF in order to obtain a highly polished effluent in terms of removal of organic matter, suspended solids and ammonia and to observe the influence of temperature, pH and nitrite accumulation on the nitrification process. The ammonia removal efficiency during summer and winter and the nitrite accumulation in presence of free ammonia were observed. The biomass density was measured at different filter bed heights and the sludge production from the effluent of the backwashing water was evaluated. The results obtained were used to calibrate a mathematical model for the prediction of the ammonia removal profile in the filter bed and of biomass thickness

El barrio porteño de Constitución en la poética cucurtiana: un espacio para la diversidad cultural latinoamericana

En el presente artículo analizo la poética de Santiago Vega/ Washington Cucurto en las 8 entregas que hiciera el autor en la página web de Eloísa Cartonera previo a publicarlas como libro por Emecé bajo el título Hasta quitarle Panamá a los yanquis. Para ello, parto de la siguiente hipótesis general: en la literatura argentina contemporánea se están configurando nuevas poéticas que se construyen a partir de la reinvención de topologías urbanas representadas en particularismos barriales. En este sentido, trabajo la poética cucurtiana en relación al barrio de Constitución de la ciudad de Buenos Aires. Con este fin, me sirvo de la categoría de imaginario urbano (García Canclini) a la que cruzo con la noción de sistema sinestésico (Susan Buck Morss). Asimismo, y para analizar dicha poética, es menester detenerse en la construcción de lenguaje a partir del cruce cultural (lo rioplatense, lo dominicano, lo peruano, boliviano, paraguayo) y del lugar que tiene la cumbia en su literatura.Fil: Rolle, Carolina. Universidad Nacional de Rosario; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Early Triassic Echinoids of the Western United States: Their Implications for Paleoecology and the Habitable Zone Hypothesis Following the Permo-triassic Mass Extinction

Confronted with global climate change and ocean acidification, our collective knowledge of ecosystem response during times of environmental crisis in Earth\u27s ancient past may provide insights towards combating ecological degradation in modern oceans. Early Triassic marine environments were characterized by oceanic warming due in part to elevated levels of atmospheric CO2 and periodic intervals of localized anoxia, resulting in an overall restructuring of faunal dominance, distribution, and biodiversity. Re-assembly of ecological communities during the Early Triassic are largely unknown; however, a previous paleoecological study by Tyler Beatty et al. (2008), suggests that post-extinction recovery length was minimized in shallow marine habitable zones. To further expand upon the investigations of Beatty et al., I used Early Triassic echinoids as a case study for understanding paleoecology on the eastern margin of Panthalassa. I hypothesized that amidst the deleterious environmental conditions of the Early Triassic, echinoids thrived within the habitable zone as an abundant member of the Modern Fauna. Early Triassic echinoids of the western United States appear exclusively within shallow marine shelves, all of which contain evidence of frequent stormactivity. Echinoids co – occur with bivalves, brachiopods, gastropods, and other echinoderms, indicating that these habitats were well oxygenated enough to support paleocommunities of considerable diversity. The oceans of the Early Triassic provide only an approximate analogue for modern oceans; however, analysis of Early Triassic ecosystems via quantification of echinoid abundance and paleoecology may help reveal important patterns necessary in understanding the rapidly shifting ecosystems of our modern, warming oceans

One Subject, Two Natures, Three Modes of Predication

This article is on the development of language about Jesus\u27 humanity and divinity while describing the historical progression of the church through the first four ecumenical councils

What can we expect from international comparison in the field of music education?: Opportunities and challenges

Analysing the conversations at the conference the chapter addresses fundamental issues of cultural comparison in music education. There is a disciplinary bias that can tempt the researcher to overestimate cultural conditions. This could lead to cultural relativism that keeps us from critically addressing normative issues associated with aims and contents of music education