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The place-based impact of built environments: Diabetes, living conditions, homes and neighbourhoods
Many studies have demonstrated the adverse effect of the built environments on health and differentiated between their direct and indirect impacts. In the case of diabetes and other chronic diseases, such studies concentrate on the direct impact of built environments on the living conditions of citizens either at home or in the neighbourhood. In the Kingdom of Saudi Arabia (KSA), little researc...


Galloping instabilities of Z-shaped shading louvers
Modern design of civil constructions such as office blocks, airport terminal buildings, factories, etc. incorporates more and more environmental considerations that lead to, amongst other elements, the use of glazed façades with shading devices to optimize energy consumption. These shading devices, normally slats or louvers, are very flexible structures exposed to the action of wind, and...
(Re)Investigation of the reactivity of uranium hexafluoride toward several organic functions at room temperature
The annual worldwide production of UF6 is very large and this compound is not used. Consequently, it could be interesting to find some applications as organic reagent. UF6 could be considered as an oxidizer of various functions. However, it seems also present some possibilities as a fluorinating reagent in mild conditions.


Ion mobility and phase transitions in heptafluorodiantimonates(III) Cs(1−x)(NH4)xSb2F7 and K0.4Rb0.6Sb2F7 according to NMR and DSC data
Ion mobility and phase transitions in heptafluorodiantimonates(III) Cs1− x (NH4) x Sb2F7 ( x =0.2; 0.6) and K0.4Rb0.6Sb2F7 were studied by the 19F, 1H NMR and DSC. The character of ionic motions in fluoride and ammonium sublattices with temperature variations was investigated. Types of ion motions and temperature ranges in which they are observed were determined. It was found that the pre...
High-ceramic-yield precursor to SiC-based ceramic: A hyperbranched polytitaniumcarbosilane bearing self-catalyzing units
A novel hyperbranched polytitaniumcarbosilane (HPTiCS) was synthesized by a monomer route. The obtained HPTiCS contains dicyclopentadienyl titanium units, which exhibits excellent self-catalytic activation of the dehydrocoupling reaction during its cross-linking process. as a result, the 1200°C ceramic yield of the pyrolyzed HPTiCS is 32wt% higher than that of titanium-free hyperbranched hydri...


Influence of Ag doping on thermoelectric properties of BiCuSeO
The effect of Ag doping on the thermoelectric properties of p-type BiCuSeO ceramics from 300 to 873K has been investigated systematically. The electrical conductivity can be improved from 5.9 to 26.9Scm−1 at room temperature with Ag doping. The Seebeck coefficients of Bi1−x Ag x CuSeO increase monotonically with temperature in all temperature range. The thermal conductivity can be suppresse...
The influence of microstructure and texture on the mechanical properties of rock tempered archaeological ceramics
The influence of tempering and firing practices on the fracture strength and fracture energy of traditional pottery is presented, focusing on the mechanical behaviour of low-calcareous ceramics and how it compares to that of comparable calcareous ceramics. Material tests on experimental briquettes show that the measured increase in fracture strength upon firing is linked to the degree of vitrif...

Investigation of the impact of micro-cracks on fracture behavior of magnesia products using wedge splitting test and digital image correlation
For refractory materials, a large strain behavior before failure is desired to improve their thermal shock resistance during their service life in industry. Their microstructure (micro-cracked) induces a non-linear mechanical behavior. The present paper aims at applying digital image correlation (DIC) during wedge splitting test on magnesia spinel sample and comparing it to pure magnesia sample...
Contribution to the understanding of the high temperature behavior and of the compressive creep behavior of silica refractory materials
Some silica (95% SiO2) refractory materials were selected and characterized by their chemical and crystallographic compositions, microstructure, refractoriness under load and bending strength versus temperature. Creep tests were realized at temperature higher than 1500°C, using the differential method. This part of the work was mainly focalized on one material. Complementary tests: annealing t...

Characterization of aluminum hydroxide (Al(OH)3) for use as a porogenic agent in castable ceramics
Porous structures based on aluminum oxide-hydroxide (Al2O3-Al(OH)3) show high refractoriness. Regarding their use as thermal insulators, the preparation of aqueous castable suspensions requires suitable conditions to produce stable co-dispersions and a deeper knowledge on their porogenic-sintering behaviors. This study reports on the characterization of a commercial grade of Al(OH)3 and several...
Reaction mechanism between the carbon bonded magnesia coatings deposited on carbon bonded alumina and a steel melt
The carbon bonded magnesia (MgOC) coatings deposited on the carbon bonded alumina (Al2O3 C) substrate are intended to be used as reactive filters for filtration of steel melts containing high oxygen levels and inclusions. The aim of this study was to describe the chemical reactions running at 1600°C at the interface between the MgO–C coating and the liquid 42CrMo4 steel, at the interface bet...

Plasma spray deposition of yttrium oxide on graphite, coating characterization and interaction with molten uranium
Yttrium oxide coatings on graphite substrates were prepared by atmospheric plasma spray technique. Temperature and velocity of the yttrium oxide particles during the plasma spray process were measured by ‘spraywatch’ diagnostics system. Coatings were characterized for phase composition, microstructure and thermal stability. Dense adherent coatings could be deposited at 24kW power. Corrosion...
In situ production of nano-CoAl2O4 on a ceramic surface by ink-jet printing
The nano-CoAl2O4 pigments were produced on ceramic substrate by ink-jet printing technology via a chemical reaction between two different water-soluble inks, which are based on aluminium citrate and cobalt nitrate. The surface tension and viscosity of the prepared inks were evaluated. The ink-jet printing process was repeated 1, 3 and 5 times in order to evaluate variations in the optical prope...
Kinetic model of the dissolution process of a zirconium white frit. Influence of the temperature
The dissolution of a zirconium white frit has been studied in order to know the kinetics of the process. The concentrations of five cations (Ca, Mg, Zn, Si and B) have been determined by ICP-OES after carrying out the solubility process of the frit at several temperatures. These concentrations and some characteristics of the frit (chemical composition, density, etc.) have been used to propose a...
Critical influence of alumina content on the low temperature degradation of 2–3mol% yttria-stabilized TZP for dental restorations
The influence of 0.25, 2 and 5wt.% alumina addition on the mechanical properties and low temperature degradation (LTD) of 3, 2.5 and 2mol% yttria-stabilized TZP ceramics was investigated. The amount of alumina addition was observed to have a crucial impact on the degradation of Y-TZP ceramics. Independent on the yttria stabilizer content, 0.25wt.% alumina had a higher degradation retarding effe...