Search results for "dalit"

An average structure model of the intermediate phase between sodalite and cancrinite

2018

Abstract Powder samples of the intermediate phase between sodalite and cancrinite (INT) have been synthesized hydrothermally. The formation of the INT phase was proved by both PXRD and TGA analysis and its stoichiometric composition was found to be |Na6.95(1)(CO3)0.48(2) (H2O)6.18(6)|[AlSiO4]6. The comparison of the intensity ratios of PXRD data with a SCXRD measurement indicates the formation of a comparable phase with the typical strong stacking disorder. The hexagonal lattice parameters with a=1266.3(2) pm and c=1586(1) pm and the unit cell setting were determined by Pawley fits. The average lattice and the stacking disorder along c axis could be confirmed by the reconstruction of three-…

Hackmanite—The Natural Glow-in-the-Dark Material

2020

“Glow-in-the-dark” materials are known to practically everyone who has ever traveled by airplane or cruise ship, since they are commonly used for self-lit emergency exit signs. The green afterglow, persistent luminescence (PeL), is obtained from divalent europium doped to a synthetic strontium aluminate, but there are also some natural minerals capable of afterglow. One such mineral is hackmanite, the afterglow of which has never been thoroughly investigated, even if its synthetic versions can compete with some of the best commercially available synthetic PeL materials. Here we combine experimental and computational data to show that the white PeL of natural hackmanite is generated and cont…

Template-free synthesis and structural evolution of discrete hydroxycancrinite zeolite nanorods from high-concentration hydrogels.

2017

We report the synthesis and characterization of hydroxycancrinite zeolite nanorods by a simple hydrothermal treatment of aluminosilicate hydrogels at high concentrations of precursors without the use of structure-directing agents. Transmission electron microscopy (TEM) analysis reveals that cancrinite nanorods, with lengths of 200-800 nm and diameters of 30-50 nm, exhibit a hexagonal morphology and are elongated along the crystallographic c direction. The powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) and TEM studies revealed sequential events of hydrogel formation, the formation of aggregated sodalite nuclei, the conversion of sodalite to cancrinite and finally the gro…

Fuzziness as an experimental science: an homage to Claudio Moraga

2016

In this contribution we collect a few considerations and remarks on such apparently unrelated topics as: an early paper by Norbert Wiener on the Nature of Mathematics; mathematical logic’s heritage on the formalization of reasoning; cognitive aspects on the modalities of drawing conclusions. We hope that reading the present paper will show that they are, neverthless, related in some way at least for what regards the problem of reasoning in the presence of uncertainty, showing a network of concepts that can help considering again the innovating aspects of fuzziness—in our opinion a more than fit homage to Claudio Moraga’s interdisciplinary approach to fuzziness.

Scheduling Multimodal Transportation Systems

2004

Abstract In this paper a Lagrangian based heuristic procedure for scheduling transportation networks is presented. The solution procedure schedules a single line at a time, possibly correcting the previous decisions at each step.

Rationing and triage of scarce, lifesaving therapy in the context of the COVID-19 pandemic: a cross-sectional, social media-driven, scenario-based on…

2020

ABSTRACTBackgroundThe recent COVID-19 pandemic made us aware that medical resources are limited. When demand for essential resources surpasses availability, difficult triaging decisions are necessary. While algorithms exist, almost nothing is known on societal attitudes regarding triage criteria.MethodsA cross-sectional survey was conducted via social media channels to query a broad sample of society. Participants were asked to make triage decisions in case-based vignettes, exploring a variety of factors. They also were asked to assess how sure they were about their decisions, and how such decisions should be reached.ResultsThe survey was completed in full by 1626 participants in April 2020…

Les ducs de Bourbon (de Louis II au connétable de Bourbon) : leurs pouvoirs et leur pouvoir

1993

Trois remarques préalables s'imposent : 1. Louis II a été le troisième duc de Bourbon. Pourtant il est le premier que l'on peut considérer comme un prince ; le grand seigneur se fait prince. 2. Dans les ouvrages que j'ai écrits ou dirigés sur l'Histoire du Bourbonnais, j'ai toujours considéré que le Moyen Age en Bourbonnais se prolongeait jusqu'aux années 1523 (fuite du connétable)-1527 (mort du connétable). Le connétable de Bourbon est un prince médiéval. Cela pouvait paraître original, il y...

Leaping across Modalities: Speed Regulation Messages in Audio and Tactile Domains

2010

This study examines three design bases for speed regulation messages by testing their ability to function across modalities. Two of the design bases utilise a method originally intended for sound design and the third uses a method meant for tactile feedback. According to the experimental results, all designs communicate the intended meanings similarly in audio and tactile domains. It was also found that melodic (frequency changes) and rhythmic (segmentation) features of stimuli function differently for each type of message.

L'abolizione delle Province in Sicilia: resoconto semiserio di un rivoluzione in progress

2014

Some Implications for Developing Learners’ Figurative Language Competence Across Modalities: Metaphor, Metonymy and Blending in the Picture Modality

2014

The paper argues for developing learners’ figurative language competence across modalities. Specifically, focusing on the picture modality, the article attempts to show the importance of figurative thinking in the new media age multimodal communication. The sample analysis of pictures and images representing the recent issue of the EU crisis addresses the significance of three conceptual phenomena, namely, metaphor, metonymy, and blending, in the conceptualization of such a highly abstract phenomenon. In general, it is argued that language users almost invariably turn to figurative language resources to conceptualize abstract phenomena that cannot be conceptualized by means of literal langu…