Search results for "Glass"
showing 10 items of 1153 documents
Impact of electron beam irradiation on fish gelatin film properties
2016
International audience; The objective of this work was to display the effect of electron beam accelerator doses on properties of plasticized fish gelatin film. Electron spin resonance indicates free radical formation during irradiation, which might induce intermolecular cross-linking. Tensile strength for gelatin film significantly increases after irradiation (improved by 30% for 60 kGy). The vapour permeability is weakly affected by irradiation. Surface tension and its polar component increase significantly and are in accordance with the increase of wettability. So, irradiation may change the orientation of polar groups of gelatin at the film surface and crosslink the hydrophobic amino aci…
Free-volume Study in GeS2-Ga2S3-CsCl Chalcohalide Glasses Using Positron Annihilation Technique
2015
Abstract Positron annihilation lifetime spectroscopy combined with Doppler broadening of annihilation radiation was applied to study free-volume entities in Ge-Ga-S glasses having different amount of CsCl additives. It is shown that the structural changes caused by CsCl additives can be adequately described by positron trapping modes determined within two-state model. The results testify in a favor of rather unchanged nature of corresponding free-volume voids responsible for positron trapping in the studied glasses, when mainly concentration of these traps is a subject to most significant changes with composition.
Un témoignage de gestes funéraires antiques à Bonneuil-en-France (Val-d’Oise)
2022
Eine Suchschnittprospektion bei Bonneuil-en-France (Val-d’Oise), hat eine stark holzkohlehaltige Schicht zum Vorschein gebracht, die reich an verbrannten oder durch Feuereinwirkung beeinträchtigten archäologischem Fundgut war. Dieses kann in die zweite Hälfte des 1. oder an den Beginn des 2. Jh. n. Chr. datiert werden. Die archäologische Fundstelle, die sich im Talboden am Zusammenfluss von Crould und Morée befindet, gehört zu einer seit der späten Hallstattzeit genutzten Gräberlandschaft. Mehrere Argumente sprechen dafür, dass es sich hier um eine Schüttung von Überresten einer Brandbestattung handelt, bei der durch ein Auslesen der Leichenbrandreste nur wenige menschliche Knochen erhalten…
Lightning-induced weathering of Cascadian volcanic peaks
2020
Abstract The process of meteorological lightning-induced modification of coherent volcanic rocks is examined by geochemical, textural, and experimental analysis of fulgurites from South Sister volcano, Oregon Cascades, USA. Lightning's effects on volcanic target rocks was simulated with an arc-welding device in order to reproduce the geochemical and textural features of natural fulgurites and to constrain temperatures of melting and devolatilization behavior during lightning strikes. Melting of volcanic target rocks produces melts of exceptional compositional diversity, ranging from those with pure mineral compositions (e.g., diopside and plagioclase), resulting from congruent melting react…
Advances in Fourier transform infrared spectroscopy of natural glasses: From sample preparation to data analysis
2014
Fourier transform infrared spectroscopy (FTIR) is an analytical technique utilized to measure the concentrations of H and C species in volcanic glasses. Water and CO2 are the most abundant volatile species in volcanic systems. Water is present in magmas in higher concentrations than CO2 and is also more soluble at lower pressures, and, therefore it is the dominant volatile forming bubbles during volcanic eruptions. Dissolved water affects both phase equilibria and melt physical properties such as density and viscosity, therefore, water is important for understanding magmatic processes. Additionally, quantitative measurements of different volatile species using FTIR can be achieved at high s…
Volcanic SiO2-cristobalite: A natural product of chemical vapor deposition
2020
Abstract Cristobalite is a low-pressure, high-temperature SiO2 polymorph that occurs as a metastable phase in many geologic settings, including as crystals deposited from vapor within the pores of volcanic rocks. Such vapor-phase cristobalite (VPC) has been inferred to result from silica redistribution by acidic volcanic gases but a precise mechanism for its formation has not been established. We address this by investigating the composition and structure of VPC deposited on plagioclase substrates within a rhyolite lava flow, at the micrometer to nanometer scale. The VPC contains impurities of the form [AlO4/Na+]0—coupled substitution of Al3+ charge-balanced by interstitial Na+—which are ty…
Vasellame in vetro dalle cisterne del castello di Butera
2012
The assemblage of glass artefacts, which is the subject of this contribution, has been retrieved from four cisterns (A, B, C, F) of the Medieval Castle of Butera. They are closed contexts, which were not manipulated by modern interventions, and permit a better defnition of the chronology of the glass objects through their association with ceramic material
Brevetti
2010
Per il lavoro di ricerca,di cui il libro "Glassblock and Architecture. Evoluzione del vetromattone e recenti applicazioni" rappresenta una sintesi preliminare,sono stati analizzati e riportati in elenco numerosi brevetti sul vetromattone ed i sistemi di posa in opera ad esso correlati oltre che alcuni specifici accorgimenti atti a migliorare le caratteristiche del vetro e degli “accessori” utili all’istallazione dei vetromattoni stessi.Di ciascun brevetto si riportano il nome dell'autore, l’azienda per la quale il brevetto stesso è stato richiesto e pubblicato (laddove esistente), la data di presentazione della domanda di brevettazione e la relativa data di concessione.
Performance Analyses of Innovative Glassblocks for BIPV
2014
The paper illustrates the results of the performance analyses conducted on an innovative glassblock integrated with 3rd generation dye-sensitized solar cells, designed for enabling the construction of translucent and sustainable building envelopes. The analyses encompass the simulation of both thermal and optical performance referring to different configurations of the PV-integrated glassblock, showing the results obtained by using two different software tools: Comsol Multiphysics and WINDOW. The configurations may differ, for example, because of the position of the module inside the glassblock, the type of dye-sensitized solar module used (composition, transparency, design), and glassblock…
Investigation of photoluminescence and amplified spontaneous emission properties of cyanoacetic acid derivative (KTB) in PVK amorphous thin films
2018
This work was supported by European Regional Development Fund within the Project No. 1.1.1.1/16/A/046 and A.Riekstins SIA “Mikrotīkls” donation, administered by University of Latvia Foundation.