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Showing 1 to 9 of 9 for “"ultrasonic dispersion"”.
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Studies of the mechanisms of stabilization of organic matter in semiarid soils
… of particle size fractions and the effects of ultrasonic dispersion on them were examined during fractionations using different combinations of sedimentation and ultrasonic dispersion of aqueous soil suspensions. The chemical compositions (C, N, and P) were consistently different for the …
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Low-temperature thermal expansion of amorphous solids
… of specific heat, thermal conductivity and ultrasonic dispersion are qualitatively similar, independent of chemical composition. It has been suggested that thermal expansion also exhibits this universal behavior. The development of a dilatometer cap- 12 able of resolving sample strains as …
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The modification of activated carbon cloth by alumina deposition
… pre-wetting the carbon cloth and by the use of ultrasonic dispersion during boehmite impregnation. Dried boehmite/carbon composites, with loading levels of up to 180wt.%, were heated under vacuum to 5000 C. In this manner alumina/carbon composites of up to 60wt.% alumina were fabricated. The …
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Design of a high intensity ultrasound dispersion cell
… to give recommendations for the production of an ultrasonic dispersion cell with a removable treatment vessel. The primary mechanism for causing this dispersion was cavitation: a void of air or vapour in a liquid medium that grows and collapses in an intense ultrasonic sound field. The secondary …
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Influence of catalyst ink mixing procedures on catalyst layer properties and in-situ PEMFC performance
… film structure. During high shear stirring and ultrasonic homogenisation of catalyst inks, the ink mixture significantly heats up. It has been observed that at higher temperatures, Nafion elongates and the contact with catalyst agglomerates is enhanced. High shear stirring of catalyst inks seems …
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Vliv parametrů dispergace na formování vezikulárních systémů
Práca popisuje metódu prípravy kataniontových vezikulárnych systémov použitím metódy ultrazvukovej dispergácie s cieľom nájsť najvhodnejšie parametre na prípravu systému s dlhodobou fyzikálnou stabilitou. Porovnávanými parametrami boli amplitúda ultrazvukovej vlny, energia použitá na dispergáciu a …
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Ultrasonic wave dispersion and attenuation as tools for mechanical characterization of construction materials [Dispersione e attenuazione dell'onda ultrasonica come strumenti per la caratterizzazione meccanica dei materiali da costruzione]
Questa tesi di dottorato indaga la dispersione e l’attenuazione delle onde ultrasoniche come strumenti quantitativi per la caratterizzazione meccanica dei materiali da costruzione. Sebbene le tecniche ultrasoniche siano ampiamente utilizzate nella pratica, la loro interpretazione si basa spesso su …
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Detection and assessment of wood decay – glulam beams and wooden utility poles
… report documents the development of acoustic and ultrasonic inspection methods on wooden glulam beams and utility poles. All beams and poles examined where composed of Douglas-fir. The report begins with a description of the structure of trees, the mechanical behavior of wood subjected to rot, and …