Search results for "Solid"
showing 10 items of 3575 documents
18O-labeled interstitial oxygen molecules as probes to study reactions involving oxygen-related species in amorphous SiO2
2012
Abstract Isotope labeling has been widely used to study reactions involving oxygen species in amorphous SiO 2 ( a -SiO 2 ). This article briefly describes recent progress in 18 O labeling techniques to study reactions involving interstitial oxygen molecules (O 2 ), which is one of the most important excess oxygen species in a -SiO 2 . The primary focus will be on the combination of the 18 O labeling with photoluminescence spectroscopy, which enables sensitive and selective detection of interstitial O 2 . Advantages of this method and results of evaluation of oxygen exchange between interstitial O 2 and the Si―O network of a -SiO 2 will be presented.
Fruit physical, chemical and aromatic attributes of early, intermediate and late apricot cultivars.
2010
BACKGROUND: In order to reach good fruit quality, apricots require a balance of sugars and acids as well as a strong apricot aroma. In this study, fruit quality of early, intermediate and late apricot cultivars was evaluated by measuring physical, chemical and olfactory attributes. Multivariate analysis of quality and aroma attributes was used to identify groups of similar cultivars and association with ripening season. RESULTS: Physical, chemical and aromatic attributes showed great variation amongcultivars but no relation to ripening season. Aromatic profiles (34 volatiles) of fruit tissues indicated qualitative and quantitative differences among cultivars. Ninfa and Mandorlon were riches…
Dendronized azochromophores with aromatic and perfluoroaromatic fragments: Synthesis and properties demonstrating Ar ArF interactions
2019
Abstract Syntheses of four new dendronized azochromophores were performed from 2-(2-amino-5-nitrophenoxy)ethanol, 2-[methyl(phenyl)amino]ethanol, 3,5-bis(benzyloxy)benzoic acid and 3,5-bis[(pentafluorophenyl)methoxy]benzoic acid using azo coupling reaction and ester formation reaction in presence of N,Nʹ-dicyclohexylcarbodiimide and 4-(dimethylamino)pyridine. Arene-perfluoroarene (Ar ArF) interactions are demonstrated in single crystal structure of dendronized azochromophore between pentafluorophenyl fragment and acceptor part of the azochromophore. The effect of Ar ArF interactions becomes apparent in thermal and nonlinear optical properties of the chromophores. Glass transition temperatur…
Study of the synergistic interaction between nickel, gold and molybdenum in novel modified NiO/GDC cermets, possible anode materials for CH4 fueled S…
2013
Abstract The present study concerns the structural and physicochemical characterization of novel Au–Mo–NiO/GDC cermets, alongside with measurements of their carbon tolerance. This is an investigation on whether commercially available NiO/GDC powder that is modified with Au and/or Mo can yield possible electrocatalysts as anodes for CH4 fueled SOFCs. Specifically, the performed preparation methods of deposition-precipitation and deposition-coprecipitation permitted the modification of a commercial electrocatalyst and lead to cermets that exhibit different reaction kinetics for the catalytic dissociation of CH4 and different performance for CH4 steam reforming. The most interesting structural…
In vitro models for the prediction of in vivo performance of oral dosage forms: Recent progress from partnership through the IMI OrBiTo collaboration
2019
The availability of in vitro tools that are constructed on the basis of a detailed knowledge of key aspects of gastrointestinal (GI) physiology and their impact on formulation performance and subsequent drug release behaviour is fundamental to the success and efficiency of oral drug product development. Over the last six years, the development and optimization of improved, biorelevant in vitro tools has been a cornerstone of the IMI OrBiTo (Oral Biopharmaceutics Tools) project. By bringing together key industry and academic partners, and by linking tool development and optimization to human studies to understand behaviour at the formulation/GI tract interface, the collaboration has enabled …
Detection system for depth profiling of radiotracers
2002
A reliable and efficient detection system essentially needed in the depth profiling of radiotracers consisting of two large PIN-diode arrays has been constructed. The requirements put forward to the detector system and the ability of the PIN-diode array to meet these demands are discussed. A comparison to a conventionally used liquid scintillation detector is presented by measuring an as-implanted 31Si profile in amorphous T21 ceramic by both apparatuses.
Postep, regres, stabilnosc i konsolidacje
2008
Controllable Solid Propellant Rocket Motor Stability: Deep and Rapid Variable Thrust Operations
2008
When flow and combustion processes couple with the acoustic modes of the combustion chamber, the solid rocket motors experience unsteady gas motion and associated thrust oscillation and motor vibration. The operations of the variable nozzle introduce relevant dynamic changes in the chamber flow and combustion. This article proposes a non-linear approach for the analysis of the effects of severe nozzle manoeuvres on the controllable solid rocket motor stability and provides the evidence that the acoustic wave amplitude evolution is influenced by the nozzle manoeuvre severity, shape and direction. The additional complexity in the problem of the combustion stability analysis introduced by the …
Non nuocere, aiutare, non offendere. Rileggere il De officiis di Cicerone nel conflitto tra prossimi e lontani
2019
Can Cicero’s De officiis be considered as an excuse for justifying and supporting the common idea that rights, aid and solidarity have been reserved only to those are “close” to us? In the current debate concerning the real universality and the value of human rights, the interpretation of the last work of Arpino’s author, framed in its historical and cultural context, may contribute to a fair restitution of the meaning we assume for the virtue named ratio societatis et communitatis.
Systematic review of chewing simulators : reality and reproducibility of in vitro studies
2020
Background The aim of this systematic review was to analyze the types of human chewing simulator described in scientific literature. Material and Methods An electronic search was conducted in the databases PubMed, Embase and Scopus. The search strategy included 10 search terms: “in vitro”; “dental materials”; “shear strength”; “fatigue fracture”; “bite force”; “prosthetic materials”; “chewing simulator”; “chewing machine”; “simulated mastication”; and “dental wear simulator.” Two researchers worked independently to assess the titles and abstracts of the articles. The quality of the in vitro trials selected was evaluated by means of the Consolidated Standards of Reporting Trials scale. Resul…