Search results for " compositi"

AlTf-UVM-7—Highly active catalysts for the synthesis of long chain symmetrical ethers and non-ionic surfactant structures

2010

New Lewis acid AlTf-UVM-7 catalysts with bimodal pore system and different Si to Al ratios were prepared in a two-step synthesis in which triflic acid (Tf) was incorporated into previously synthesized mesoporous aluminum-containing silica. The Al incorporation inside the pore walls was carried out through the Atrane method. The characterization of the resulted catalysts showed that the triflic acid treatment step did not damage the texture or the structure of the catalysts. These materials were used as green catalysts for the etherification of fatty alcohols and the conversion of ethylene glycol (EG) with n-octanol resulting in mixtures of short ethoxylated structures with a large distribut…

The enrichment ratio of atomic contacts in crystals, an indicator derived from the Hirshfeld surface analysis

2014

An enrichment ratio is derived from the decomposition of the crystal contact surface between pairs of interacting chemical species. The propensity of different contact types to form is investigated.

NOx selective catalytic reduction at high temperatures with mixed oxides derived from layered double hydroxides

2012

[EN] Mixed oxides derived from layered double hydroxides (LDHs) have been investigated as potential catalysts for the NOx removal at high temperatures. The best results were obtained with Co–Al mixed oxides derived from LDHs that are active at 750 ◦C in the presence of oxygen and water. These catalysts could reduce or/and decompose the NOx formed in the dense phase of the FCC regenerator, being deactivated at oxygen concentrations higher than 1.5%. Nevertheless this deactivation is not permanent and they would be regenerated after reduction with hydrogen at 530 ◦C. The influence of the layered double hydroxides (LDHs) preparation method on the catalyst activity was studied, observing that t…

Organic solvent-soluble contents of nickel and cobalt in some algae

1990

In pursuit of our work on metal contents of lipid fractions isolated from plant material, we now show by means of highly sensitive analytical methods that nickel and cobalt are also present in organic extracts of algae in detectable amounts

Analysis of Prey Composition in Eurasian Reed Warblers' Acrocephalus scirpaceus Droppings at Four Breeding Sites in Italy

2022

Our aim was to investigate the among-populations diversity of prey composition in Eurasian Reed Warblers’ diets via their droppings, both to assess the ecological validity of this sampling method and to test whether the prey species most abundant in fecal samples were also the most present in the Italian study site. We collected fecal samples at four sites throughout Italy, for a total of 144 samples. Within reedbeds, the breeding habitat of the Eurasian Reed Warbler, we also collected arthropods by carrying out entomological sweepings at one of the study sites. Within the fecal samples, we identified dozens of prey species, belonging mainly to Araneae, Coleoptera, Diptera, Hymenoptera and …

Effect of legume grains as dietary protein source on the quality of organic lamb meat

2011

Somatosensory change detection in young healthy twin males

2013

Comparison of breast milk composition among lactating women in Latvia

2016

Abstract Although benefits of breast-feeding have been known for a long time and breast milk is considered as ideal nutrition for infants, the composition of breast milk is still being studied, since breast milk differs among mothers and populations, as well as during different times of lactation. Further, no study has been performed among lactating women in Latvia during recent years. The objective of the study was to determine the breast milk composition and influencing factors among lactating women in Latvia in different lactation periods, as well as to compare the results with data from other countries. Fifty breast milk samples were obtained from 44 mothers (on the 5th-7th and 11th-28t…

Global and local stressors on community succession in the Mediterranean intertidal zone

Architetture all'ombra del vulcano: il comprensorio etneo in età moderna. Architecture in the Shadow of the Volcano: the Etna Region in the Early Mod…

2017

Tra le molteplici declinazioni che investono il rapporto architettura natura un caso particolarmente pregnante è quello dei contesti vulcanici, tanto per le implicazioni che riguardano la ricerca estetica e gli aspetti visivi, quanto la costruzione e la composizione materica degli edifici realizzati in tali contesti. La fascinazione suscitata dalle eruzioni vulcaniche attraverso i secoli ha certamente contribuito alla persistenza di miti e alla formazione di un immaginario collettivo, fino alla costruzione di identità locali radicate in territori fortemente caratterizzati, con significativi riflessi anche nella sfera architettonica. Per altro verso, la disponibilità di un’ampia gamma di mat…