119,793 research outputs found
Free bounded archimedean l -algebras
No full textWe show that free objects on sets do not exist in the category bal of bounded archimedean l-algebras. On the other hand, we introduce the category of weighted sets and prove that free objects on weighted sets do exist in bal. We conclude by discussing several consequences of this result
Le collezioni mantovane
No full textIl contributo propone gran parte del catalogo già pubblicato sul sito La lezione delle cose (ora non più consultabile on-line), a sua volta frutto dell'omonima mostra organizzata a Mantova, nei locali dell'ex chiesa della Madonna della Vittoria, tra il 9 novembre 2008 e l'11 gennaio 2009. Gli autori delle schede - Monica Ferrari, Matteo Morandi ed Enrico Platé - sono di volta in volta specificati
Il futuro è alle spalle. Causalità aristotelica e realismo sociologico
No full textLa proposta del “realismo sociologico” è offrire una alternativa alla perdita di realtà della cultura occidentale contemporanea. Si tratta di scoprire la “realtà della realtà” , senza perciò volere in nessun modo garantire l’ “infallibilità della sua conoscenza”. Solo distinguendo l’ontologia dall’epistemologia, l’essere dalla conoscenza dell’essere, è possibile “salvare” il riferimento ad una realtà indipendente dall’osservatore. Il realismo sociologico si presenta dunque come un modo di pensare capace di riproporre una ragione “aperta” e “sensibile alla verità”
Assyria: The Creation of a New Rural Landscape in the Heart of Assyria: Settlement, Irrigation Canals and Economic Growth in the Countryside around Nineveh
No full text
The relict landslide in bimsoils in downtown Genova, Italy: a new modeling approach
No full textStability problems occurring in geological units with a block-in-matrix fabric are often analyzed with deterministic approaches and/or assuming block-in-matrix rocks/soils (bimrocks or bimsoils) to be homogeneous equivalent geomaterials. However, recent studies have demonstrated that since these formations are characterized by a great (dimensional, spatial and lithological) variability, reliable results can only be obtained if a stochastic approach accounting for different block arrangements and dimensions is used.
This paper extends and improves a previous study from Minuto and Morandi (2015) to evaluate the stability of a relict landslide in bimsoil located in downtown Genova (Italy), where a deterministic approach and the traditional limit equilibrium method were used. In this work,
different slope models with elliptical blocks of variable eccentricity, size and positions are generated by means of a stochastic approach and are analyzed with the FEM code RS2. Moreover, since the slope can be considered to be a bimsoil, interfaces between the blocks and matrix are introduced in order to better simulate the lower strength at the block/matrix contacts.
The numerical analyses of the slope reveal that shallow failure surfaces have a higher probability
of occurrence as compared to the deep failure surfaces considered by Minuto and Morandi
(2015). Furthermore, lower safety factors are obtained when a block-matrix interface strength
smaller than that of the matrix (i.e., a bimsoil) is simulated
Amino acids as repressors of nitrogenase biosynthesis in Klebsiella pneumoniae
No full textNitrogenase biosynthesis in Klebsiella pneumoniae including mutant strains, which produce nitrogenase in the presence of NH+4 (Shanmugam, K.T., Chan, Irene, and Morandi, C. (1975) Biochim. Biophys. Acta 408, 101--111) is repressed by a mixture of L-amino acids. Biochemical analysis shows that glutamine synthetase activity in strains SK-24, SK-28, and SK-29 is also repressed by amino acids, with no detectable effect on glutamate dehydrogenase. Among the various amino acids, L-glutamine in combination with L-aspartate was found to repress nitrogenase biosynthesis completely. In the presence of high concentrations of glutamine (1 mg/ml) even NH+4 repressed nitrogenase biosynthesis in the strains SK-27, SK-37, SK-55 and SK-56. Under these conditions, increased glutamate dehydrogenase activity was also detected. Physiological studies show that nitrogenase derepressed strains are unable to utilize NH+4 as sole source of nitrogen for biosynthesis of glutamate for biosynthesis of glutamate, whereas back mutations leading to NH+4 utilization results in sensitivity to repression by NH+4. These findings suggest that amino acids play an important role as regulators of nitrogen fixation
Introduction / Introduzione
No full textThe article introduces the volume by tracing thirty years of research and discoveries made by the University of Udine and its partners in the ancient Near Eas
La città diffusa nella piana Firenze-Prato-Pistoia
No full text"Potenzialità di trasformazione nei territori della dispersione insediativa della Piana toscana.
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