Magnetic and spin waves studies in amorphous Gd 0.7 Y 0.3

In this paper, magnetic properties of amorphous Gd0.7 Y0.3 alloys have been studied using a linear dependence on H-1/2 of the saturation magnetization M(H); this dependence has been proved to be necessary for an adequate interpretation of magnetic behaviour of ferromagnetic amorphous compounds. Indeed, in a previous work, assuming a linear dependence on H-1 of M(H), magnetic parameters (magnetic moment, µGd , of Gd, mean exchange integral (J)) relevant to Gd0.7 Y0.3 have been undervalued. In the present work, these parameters, in addition to the stiffness constant, have been improved.In this paper, magnetic properties of amorphous Gd0.7 Y0.3 alloys have been studied using a linear dependence on H-1/2 of the saturation magnetization M(H); this dependence has been proved to be necessary for an adequate interpretation of magnetic behaviour of ferromagnetic amorphous compounds. Indeed, in a previous work, assuming a linear dependence on H-1 of M(H), magnetic parameters (magnetic moment, µGd , of Gd, mean exchange integral (J)) relevant to Gd0.7 Y0.3 have been undervalued. In the present work, these parameters, in addition to the stiffness constant, have been improved

Changes in the Demographic and Clinicopathological Characteristics of Thyroid Cancer : A Population-Based Investigation in Algeria, 1993-2013

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Magnetic and spin waves studies in amorphous Gd0.7Y0.3

In this paper, magnetic properties of amorphous Gd0.7Y0.3 alloys have been studied using a linear dependence on H-1/2 of the saturation magnetization M(H); this dependence has been proved to be necessary for an adequate interpretation of magnetic behaviour of ferromagnetic amorphous compounds. Indeed, in a previous work, assuming a linear dependence on H-1 of M(H), magnetic parameters ( magnetic moment, µGd, of Gd, mean exchange integral (J)) relevant to Gd0.7Y0.3 have been undervalued. In the present work, these parameters, in addition to the stiffness constant, have been improved. Keywords: amorphous ferromagnets- Gd-based alloys- Stiffness constant- Saturation- magnetization-Spin-wave-Exchange integral I

Effect of Cold Pretreatment, Anthers Orientation, Spikelet Position and Donor Tiller on the Callusing Response in Barley Anther In vitro Culture

The anthers in vitro culture is a useful technique for plant improvement as to create new varieties. However, the success of this technique is limited by several factors. This study was carried out to identify factors as the influence of spikelet position in the spike, position of donor tiller on plate tillering and anther orientation onto the medium as well as cold pretreatment and the genotype that affect the callusing induction in anthers in vitro culture of three cultivars of Moroccan barley (Arig 8, Asni and Tamelalt). Among genotypes, the callusing response was significantly higher in Asni (21.42%). The callusing response was significantly decreased when spikes stemmed from tillers far from the main tiller on the same tillering plate. However, anthers coming from the spikelets of the middle part of the spike showed the highest callusing response (29.85%) compared with the basal (14.83%) and the upper (6.72%) parts. It was also shown that anther cold pretreatment at 4°C for 14 days had a beneficial effect only on the callusing response but it decreased the regeneration of green plants, due to the interaction between cold pretreatment and genotypes to which spring barley is recalcitrant and more predisposed to albinism, especially six-row type (Arig 8). Moreover, anther orientation onto the surface medium had a marked effect on callusing response, anthers placed in upper orientation developed more calli (60.22%) than those in flat position (18.99%). Our findings suggest that the studied factors control the callusing response. Especially, the Anthers orientation that must be taken into account during androgenesis through anthers in vitro culture

Influence of mechanical and chemical degradation on surface gloss of resin composite materials

Purpose: To determine the changes in surface gloss of different composite materials after simulation of mechanical and chemical aging mechanisms. Methods: 36 specimens were fabricated for each material and polished with 120-, 220-, 500-, 1200-, 2400- and 4000- grit SiC abrasive paper, respectively. Gloss measurements were made with a glossmeter (Novo-Curve) prior to testing procedures. Specimens of each material were randomly divided into three groups. Group 1 was conditioned for 7 days at 37 degrees C in 75% ethanol aqueous solution. Group 2 was immersed in fluoride gel (Elmex Gelée) at 37 degrees C for 1 hour. Group 3 was subjected to simulated toothbrushing with an electric toothbrush while being immersed in toothpaste. Surface gloss measurements were made subsequently. Results: Significant difference between surface gloss of the composite materials tested were detected after simulated brushing (Kruskal Wallis, P < 0.05). With the exception of Filtek Silorane, all composite materials tested were significantly affected by immersion in Elmex Gelèe (Wilcoxon signed-rank test, P < 0.05). Immersion in 75% alcohol aqueous solution significantly affected surface gloss except natural enamel and Durafill (Wilcoxon signed-rank test, P< 0.05)

A new classification of resin-based aesthetic adhesive materials

The purpose of this article is to illustrate a new classification of resin based aesthetic materials laying on the characterization of their matrix and their filler morphology. Four samples per material have been prepared for SEM evaluation. Each sample has been treated with chloroform to dissolve its matrix in order to evidence the filler morphology. A general schema of four different matrix systems which characterize the material’s level of hydrophobicity can be put in evidence. The subsequent filler analysis individuates a more complex schema based on filler size and construction. A new classification based on matrix nature and filler morphology has been proposed. Based on this concept mechanical and aesthetic characteristics of the materials can be presumed