88 research outputs found
Low-temperature fabrication of BaBi2Nb2O9 ceramics by reaction controlled sintering
No full textReaction controlled sintering was applied to the fabrication of BaBi2Nb2O9 (BBN) ceramics at lower temperature. A powder mixture of BaCO3 and Nb2O5 was heated at 600℃ in a 1st step calcination to produce a binary precursor of BaNb2O6. The pre-heated powder was then mixed with a fixed amount of Bi2O3, which was subsequently pressed into a disk pellet. After a powder compact of the mixture was subjected to heating at 950℃ for 4 h, a BBN bulk sample with a relative density of 92% was successfully obtained. The low-temperature fabrication of dense BBN ceramics could be attributed to the inhibited formation of an intermediate phase of Ba5Nb4O15 and the production of submicron powder with an appropriate reactivity during a 1st step calcination
Depletion-Isolation Effect in Vertical MOSFETs During the Transition From Partial to Fully Depleted Operation
No full textA simulation study is made of floating-body effects (FBEs) in vertical MOSFETs due to depletion isolation as the pillar thickness is reduced from 200 to 10 nm. For pillar thicknesses between 200–60 nm, the output characteristics with and without impact ionization are identical at a low drain bias and then diverge at a high drain bias. The critical drain bias Vdc for which the increased drain–current is observed is found to decrease with a reduction in pillar thickness. This is explained by the onset of FBEs at progressively lower values of the drain bias due to the merging of the drain depletion regions at the bottom of the pillar (depletion isolation). For pillar thicknesses between 60–10 nm, the output characteristics show the opposite behavior, namely, the critical drain bias increases with a reduction in pillar thickness. This is explained by a reduction in the severity of the FBEs due to the drain debiasing effect caused by the elevated body potential. Both depletion isolation and gate–gate coupling contribute to the drain–current for pillar thicknesses between 100–40 nm
Ethylene oxidation activity of silica-supported platinum catalysts for the preservation of perishables
No full textThe ethylene oxidation activities of silica-supported platinum-based catalysts (Pt/A380 and PtRu/A380) were studied under semi-practical conditions (liter-sized batch system containing moisture and perishables). Storage tests of premature bananas, cucumbers, and apples have proved that the catalysts can remove ethylene generated from the perishables. Ripening of these perishables is significantly delayed by the catalytic removal of ethylene, which confirms that these catalysts are effective for the extension of the shelf-lives of the perishables. Two crucial parameters, the rate of ethylene production from the perishables and the rate of ethylene decomposition by the catalysts, were successfully quantified through storage tests of the perishables. The minimum amount of catalyst necessary for practical application in a storage room can be estimated by a simple numerical analysis using the determined parameters
Presence of Pheophytin and its Formation as a Chlorophyll Derivative in Selected Crop Species
No full textTransmission of alien chromosomes from selfed progenies of a complete set of Allium monosomic additions: the development of a reliable method for the maintenance of a monosomic addition set
No full textSpanish onion landraces (Allium cepa L.) as sources of germplasm for breeding calçots: a morphological and molecular survey
No full textCalçots are the immature floral stems of second-year resprouts of the ‘Blanca Tardana de Lleida’ (BTL) onion landrace, and to date, breeding has used only a few populations. So, we aimed to increase our knowledge of the variability of BTL and to explore its characteristics and genetic dissimilarity with other varieties that might be used in calçot breeding programs. We analyzed the agronomic and morphological traits of four populations of BTL, two synthetic varieties of BTL, 20 prestigious Spanish landraces, and 4 exotic onion landraces. Furthermore, we used three combinations of AFLP primers and seven microsatellites to analyze their genetic background. The Spanish landraces (including BTL) shared a large part of their genetic background, which showed considerable variability (heterozygosity around 0.5). 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