Materials Literature
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Summary The release of mercury and thallium from liquid eutectic lead-bismuth alloy (LBE) under a flowing Ar/7%-H 2 atmosphere has been studied in the temperature range from 408 to 1292 K using γ-ray spectroscopy. For technical applications such as liquid metal spallation targets or accelerator driven systems, where l…
Two new 5‐substituted 1,3,4‐thiadiazole‐2‐carboxylate esters have been synthesized via ring closure of appropriate tricarbonyl precursors using Lawesson's reagent. The chemistry described is the first report of such methodology in the organic literature. The new materials display broad smectic C phases and show consid…
This research concerned with the use of rice husk (Oryza sativa) as a filler for polypropylene and its recycle ability. Rice husk (200 mesh and 40% by weight) and polypropylene were compounded in a twinscrew extruder and injection moulding technique was applied in order to obtain testing specimens. It was found that t…
The evolution of the plastic strain macrolocalization pattern in low-temperature creep of commercial purity aluminum is studied. The localization pattern depends on a stage in the creep curve. At the stage of steady-state creep, localization zones propagate in the form of a wave traveling with a velocity proportional…
Cesium triborate (CsB 3 O 5 ) is expected to be an efficient harmonic generator in the UV region. However, as-grown single crystals of CsB 3 O 5 often contain a high density of optical scattering centers that significantly reduce device performance. We found that these can be removed by a post-growth heat treatment wi…
This paper presents the results of studying the thermoluminescent (TL) characteristics of Gadolinium-doped Zirconium oxide (ZrO2:Gd) films. Samples were prepared by the spray pyrolisis method depositing them on different substrates using various concentrations of the dopant and exposing to UV radiation of different wa…
Abstract The distribution of substituents of cellulose xanthogenate and carboxymethyl cellulose along the cellulose chains and therefore in relation to the molecular mass can be measured using size exclusion chromatography including a multi angle laser light scattering and mass detection for determining the molecular…
The ionic conductivity and permittivity of glasses based on ZrF4, BaF2, LaF3, AlF3 and NaF (ZBLAN) or PbF2, InF3, BaF2, AlF3 and LaF3 (PIBAL) are studied. The influence of the glass composition on the glass transition temperature (Tg) and on the crystallization temperature (Tx) is reported. For all ZBLAN glasses the t…
Abstract The inclusion of vanadocene dichloride (VDC) and 1,1′-dimethyl vanadocene dichloride (MeVDC) into cyclodextrines (α-CD, β-CD and γ-CD) was studied by EPR spectroscopy. It was found that VDC and MeVDC with β-CD and γ-CD form true inclusion compounds, but with α-CD, VDC and MeVDC gave only fine dispersion mixtu…
To study the behavior of fluorite in SiO 2 ‐Al 2 O 3 ‐Na 2 O‐K 2 O‐H 2 O melts, we conducted both crystallization and dissolution experiments. In the first case, fluorite crystallized from melts enriched in Ca relative to F. In the second case, ground fluorite (<10 μm) was partially dissolved into melts of initiall…
A nonwoven fibrous filter media is modeled as a planar stochastic array of straight lines defining multiple polygons. The cumulative distribution and mean of the hydraulic diameter of these polygons is determined, and related theoretically to the “mean flow” pore diameter commonly measured by commercial partial flow t…
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Two series of three‐ring heterocyclic liquid crystalline (LC) materials have been synthesized and characterized, one incorporating a thiophene ring and the other containing a thiophene‐pyrimidine moiety. This is the first study to show the effect of a thiophene‐pyrimidine moiety on the thermal and physical properties…
The effect of metal loading on structural properties and CO oxidation activity of coprecipitated Co/Al2O3 catalysts was investigated. The results indicated the participation of cobalt in the Co-Al skeleton for all coprecipitated samples. Environmental-SEM-EDXS studies showed that at loadings higher than ca. 15 wt.-%,…
Ten new species of small dictyostelids, five belonging to Acytostelium (A. anastomosans, A. longisorophorum, A. magnisorum, A. serpentarium and A. singulare) and five to Dictyostelium (D. amphisporum, D. naviculare, D. oculare, D. potamoides and D. stellatum), were isolated from forest soils in the Great Smoky Mountai…
International recommendations for changes to the SI brochure regarding the definition and use of the quantity dose equivalent are presented. The second part of this note is a simple explanation of the difference between a radiation quantity and its unit.
Abstract Spider dragline silk is an extremely strong biopolymer and has unique combination of desirable mechanical properties. In the present paper dragline of Golden Nephila spider was studied for dimensional, structural, physical and tensile properties. The test results established significant variability in diamete…
Abstract Clay minerals occur as replacements of olivine, pyroxenes, plagioclase and interstitial materials, and as vesicle fillings, in altered basalts from the Middle Atlas (Morocco). Phyllosilicates are the main components of this alteration process. They have been characterized here by optical microscopy, X-ray dif…
Polyamidoamine dendrimers have been synthesised from ethylenediamine and methyl acrylate and their effectiveness in decolorising wastewater containing Acid Fuchsin and Methyl Blue demonstrated. The effect of variables, such as initial pH, quantity and generation of dendrimer, has been investigated. The experimental re…
High quality undoped and Ga2O3 doped ZnO nanoribbons are grown by chemical vapor transport and condensation. The effect of the dopant on the structural and optical properties is investigated. The hexagonal wurtzite structure is ascertained with X-ray diffraction and Raman spectroscopy. Photoluminescence on doped ZnO r…