Home About us Contact | |||
Geometrical Shape (geometrical + shape)
Selected AbstractsCorrelation between Arrangement of Dielectric Layers and Microwave Dielectric Properties of Mg0.93Ca0.07TiO3,(Ca0.3Li0.14Sm0.42)TiO3 CeramicsJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 8 2003Joon Yeob Cho Effect of geometrical shape and induced thermal strain on the microwave dielectric properties of the layered structure ceramics of Mg0.93Ca0.07TiO3 with (Ca0.3Li0.14Sm0.42)TiO3 was investigated as a function of the number of dielectric layers. The dielectric constant and the temperature coefficient of resonant frequency (TCF) were not changed significantly with the number of dielectric layers but only depended on the net compositional ratio. However, the dielectric loss quality was affected by the number of interfaces between dielectric layers, which had a partial composition inhomogeneity due to the diffusion of Mg2+ and Ti4+ ions. The dielectric loss quality also decreased with an increase of thermal strain induced to each dielectric layer. [source] Colour characteristics of honeys as influenced by pollen grain content: a multivariate studyJOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, Issue 4 2004Anass Terrab Abstract A chromatic analysis by tristimulus colorimetry and a pollen analysis (pollen grains contained in each honey sample, considering their volume and geometrical shape) were carried out on 33 Eucalyptus unifloral honeys; the colour of the pollen grains was also considered. Multiple linear regression (MLR) and partial least squares regression (PLSR) were used to establish equations relating the chromatic variables to the pollen data, ie number and morphology of the pollen grains, thus allowing the prediction of the ultimate colour from the botanical characteristics. The results obtained show that lightness (L*) is significantly (p < 0.05) related to the pollen type Olea europaea; on the other hand, the variable that better relates to the chroma is the Zea mays pollen type. Copyright © 2004 Society of Chemical Industry [source] Influence of piezoelectric fields on excitonic complexes in InGaN quantum dotsPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 4 2009K. Sebald Abstract We present an analysis of the optical properties of single InGaN quantum dots (QDs) grown by MOVPE. The samples were structured into mesas by focused-ion-beam etching and investigated by micro-photoluminescence measurements. The QDs are characterized by the high temperature stability of their emission up to 150 K. Furthermore, the polarization of individual QD emission lines was analyzed giving an insight into their geometrical shape. Time-resolved microphotoluminescence measurements on the excitonic and biexcitonic transition of a single quantum dot yields a radiative recombination lifetime of 2.06 ns for the exciton. The data can be fitted by a simple model for cascaded emission confirming the expected refilling of the excitonic state by biexcitonic recombination. In addition, the influence of piezoelectric fields on the exciton and biexciton emission and on their binding energy in single QDs was investigated. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] MODELING DIMENSIONAL SHRINKAGE OF SHAPED FOODS IN FLUIDIZED BED DRYINGJOURNAL OF FOOD PROCESSING AND PRESERVATION, Issue 2 2005WIJITHA SENADEERA ABSTRACT Three particular geometrical shapes of parallelepiped, cylinder and sphere were selected from cut beans (length : diameter = 1:1, 2:1, 3:1), potatoes (aspect ratio = 1:1, 2:1, 3:1) and peas, respectively. The dimensional shrinkage behavior was studied in a batch fluidized bed at three drying temperatures of 30, 40 and 50C. Relative humidity of hot air was kept at 15%. Dimensional shrinkage was plotted using a nondimensional moisture ratio and the shrinkage behavior of the selected foods was modeled with simple mathematical models. [source] |