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Lucian Dascalescu - One of the best experts on this subject based on the ideXlab platform.

  • effect of particle size on the tribo aero electrostatic separation of plastics
    Journal of Electrostatics, 2017
    Co-Authors: Thami Zeghloul, Abdelkader Mekhalef Benhafssa, Gontran Richard, Karim Medles, Lucian Dascalescu
    Abstract:

    Abstract Numerous research studies have been made on the electrostatic separation of granular insulating materials, with many industrial applications in the area of waste electric and electronic equipment (WEEE) recycling. However, very few investigators have studied the separation of Finely-Ground matter (i.e., granule diameter

  • effect of particle size on the tribo aero electrostatic separation of plastics
    Journal of Electrostatics, 2017
    Co-Authors: Thami Zeghloul, Abdelkader Mekhalef Benhafssa, Gontran Richard, Karim Medles, Lucian Dascalescu
    Abstract:

    Abstract Numerous research studies have been made on the electrostatic separation of granular insulating materials, with many industrial applications in the area of waste electric and electronic equipment (WEEE) recycling. However, very few investigators have studied the separation of Finely-Ground matter (i.e., granule diameter

  • Study of two-stage-type electrostatic precipitator in axisymmetric configuration applied to Finely Ground lignocellulosic materials
    2017 IEEE Industry Applications Society Annual Meeting, 2017
    Co-Authors: N. Zouzou, Lucian Dascalescu, A. Zouaghi, F. Kherbouche, C. Mayer-laigle, Xavier Rouau
    Abstract:

    The main objective of this paper is to develop a novel two-stage-type electrostatic precipitator to collect Finely Ground lignocellulosic particles. To prevent the danger of explosion of such a powdery material, ion generation and particle charging processes are separated. Main results show that the particles can be highly charged in a two-coaxial-cylinders triode-type device, which also facilitates their collection. For instance, the collection efficiency reaches 92 % for particle size of about 0.3 μm, and exceeds 99% for particle size greater than 2 μm.

  • electrostatic separation of peeling and gluten from Finely Ground wheat grains
    Particulate Science and Technology, 2014
    Co-Authors: Mokdad Remadnia, Adrian Oprean, Sara Messal, Xavier Rouau, Misako Kachi, Lucian Dascalescu
    Abstract:

    Sieving and air classification are not efficient enough for the extraction of the high-nutritional-value constituents of wheat. The aim of this article is to validate a simple electrostatic separation method of peeling and gluten, which are two such nutriments contained in Finely Ground wheat grains. The electrostatic separator is composed of metallic Grounded belt conveyer and a rotating roll electrode connected to a high voltage supply. The electrostatic behavior of peeling and gluten powders was characterized using surface potential decay and direct charge measurements. These first set of experiments pointed out the conductive behavior of these powders: in contact with a Grounded electrode, they lose their charge in less than 10 s. In a second set of experiments, mixtures of 50% peeling and 50% gluten powders were processed by electrostatic separation. Experimental design methodology was used to model the outcome of the separation process as function of two control variables: the high-voltage applied t...

  • electrostatic separation of peeling and gluten from Finely Ground wheat grains
    Particulate Science and Technology, 2014
    Co-Authors: Mokdad Remadnia, Adrian Oprean, Sara Messal, Xavier Rouau, Misako Kachi, Lucian Dascalescu
    Abstract:

    Sieving and air classification are not efficient enough for the extraction of the high-nutritional-value constituents of wheat. The aim of this article is to validate a simple electrostatic separation method of peeling and gluten, which are two such nutriments contained in Finely Ground wheat grains. The electrostatic separator is composed of metallic Grounded belt conveyer and a rotating roll electrode connected to a high voltage supply. The electrostatic behavior of peeling and gluten powders was characterized using surface potential decay and direct charge measurements. These first set of experiments pointed out the conductive behavior of these powders: in contact with a Grounded electrode, they lose their charge in less than 10 s. In a second set of experiments, mixtures of 50% peeling and 50% gluten powders were processed by electrostatic separation. Experimental design methodology was used to model the outcome of the separation process as function of two control variables: the high-voltage applied t...

A J Cowieson - One of the best experts on this subject based on the ideXlab platform.

  • influence of steam pelleting temperatures and grain variety of Finely Ground sorghum based broiler diets on small intestinal starch and nitrogen digestion dynamics in broiler chickens
    International Journal of Poultry Science, 2014
    Co-Authors: S Y Liu, P H Selle, A J Cowieson
    Abstract:

    The effects of sorghum grain variety and conditioning temperature at which broiler diets were steam-pelleted on small intestinal digestion dynamics of starch and nitrogen were assessed. A 2×3 factorial array of treatments comprised two sorghum varieties, with white (Liberty) and red (Venture) pericarps and three conditioning temperatures (70, 80, 90°C). Both sorghums were Finely-Ground through a 2.0 mm hammer-mill screen prior to incorporation into the diets. Each of the dietary treatments was offered to six replicate cages (6 birds per cage) from 7 to 28 days post-hatch. Digesta samples were collected at day 28 for determination of starch and nitrogen digestibilities and mean retention time in the proximal jejunum, distal jejunum, proximal ileum and distal ileum. The digestion dynamics of starch and nitrogen were determined using an exponential mathematical model to relate digestion coefficients with mean retention times in each small intestinal segment. Increasing conditioning temperatures generated a 'concav e response' in starch digestion rates in white sorghum diets; whereas, there was a 'convex response' in red sorghum diets. Thus, at the intermediate 80°C conditioning temperature, starch digestion rates were at a minimum value for white, but at a maximum value for red sorghum-based diets, which is consistent with the significant sorghum type×temperature interaction (p<0.05). Conditioning temperatures increased potential digestible starch (r = 0.336, p<0.05), predicted glucose absorption (r = 0.468, p<0.01), retention time in the distal ileum (r = 0.362, p<0.05) and the entire small intestine (r = 0.371, p<0.05). There was a quadratic relationship between potential digestible starch (p<0.05) and Feed Conversion Ratio (FCR), which indicated that the optimal FCR was attained with a potential digestible starch value of 0.862. These results suggested that starch and protein digestion may influence feed conversion efficiency.

  • steam pelleting temperatures and grain variety of Finely Ground sorghum based broiler diets 1 influence on growth performance relative gizzard weights nutrient utilisation starch and nitrogen digestibility
    Animal Production Science, 2014
    Co-Authors: P H Selle, S Y Liu, Ali Khoddami, J Cai, A J Cowieson
    Abstract:

    Sorghum-based diets were offered to male Ross 308 chicks from 7 to 28 days post-hatch as a 2 × 3 factorial array of treatments. The diets were based on either a white (Liberty) or red (Venture) sorghum that were Finely Ground through a 2.0-mm hammer-mill screen before incorporation into diets that were steam-pelleted at conditioning temperatures of 70°C, 80°C and 90°C. Protein solubilities and concentrations of disulfide bonds and free sulfydryl groups in sorghums and sorghum-based diets were determined. Concentrations of phenolic compounds and antioxidant activities in both sorghums were analysed and the presence or absence of a pigmented testa was detected. In vivo parameters assessed included growth performance, relative gizzard weights, nutrient utilisation and apparent starch and nitrogen (N) digestibility coefficients were determined at four small-intestinal sites. Increasing conditioning temperatures depressed dietary protein solubilities and induced changes in concentrations of disulfide bonds and free sulfydryl groups that were more pronounced in red sorghum-based diets. The red sorghum contained a higher concentration of phenolic compounds and had a higher antioxidant activity than did white sorghum. A pigmented testa was not present in both sorghums, which indicates that they do not contain condensed tannin. There was a significant interaction between sorghum type and conditioning temperature for weight gain; however, diets based on white or red sorghums did not generate any significant differences in weight gains, feed intakes or feed conversion ratios as main effects. It was anticipated that birds would perform better on white sorghum-based diets but the likelihood is that the fine 2.0-mm grind disadvantaged the softer-textured white sorghum. As main effects, red sorghum-based diets had significantly higher densities of N-corrected apparent metabolisable energy, a higher starch digestibility coefficient in the distal jejunum and higher N digestibility coefficients in the distal jejunum, proximal ileum and distal ileum than did white sorghum-based diets. Red sorghum-based diets generated significantly heavier relative gizzard weights, which appeared to enhance N digestibility coefficients relative to the white sorghum diets. Increasing conditioning temperatures linearly increased starch digestibility coefficients in the proximal jejunum and distal ileum and N digestibility coefficients in the proximal jejunum, distal jejunum and distal ileum to significant extents. Conditioning temperatures did not significantly influence gizzard weights or parameters of growth performance and nutrient utilisation. Several significant interactions between the main effects were observed, which suggests that the two sorghums responded somewhat differently to increasing conditioning temperatures.

Zeynep Sertabipoglu - One of the best experts on this subject based on the ideXlab platform.

  • effect of heat treatment on pozzolanic activity of volcanic pumice used as cementitious material
    Cement & Concrete Composites, 2015
    Co-Authors: Alaettin Kilic, Zeynep Sertabipoglu
    Abstract:

    Abstract Volcanic pumice (VP) is a highly vesicular material derived from acidic lavas. It substantially contains amorphous silica, and widely used in many industry, such as construction, textile, chemical and agricultural industries, due to its physical properties. The study is aimed to evaluate the suitability of Finely Ground (−20 μm) and/or heated (at 1000 °C) volcanic pumice powder to be used as a supplementary cementitious material. Mortar cylinders were prepared using Finely Ground natural pumice powder, and heated (1000 °C) pumice powder (0–20%) at different mixes ratios as cement replacement. The results from this study showed that the heat treatment significantly affected the pozzolanic activity of VP, and use of heated-Ground pumice as a supplementary cementitious material increased the strength of mortar up to 7% in 90 days as well as 7- and, 28-day strengths.

Kyle A. Riding - One of the best experts on this subject based on the ideXlab platform.

  • influence of different particle sizes on reactivity of Finely Ground glass as supplementary cementitious material scm
    Cement & Concrete Composites, 2015
    Co-Authors: Mohammadreza Mirzahosseini, Kyle A. Riding
    Abstract:

    Abstract Finely Ground glass can be pozzolanically reactive and serve as a supplementary cementitious material (SCM). In this study, the pozzolanic reactivity of three narrow size ranges of green glass cullet, 63–75 μm, 25–38 μm, and 0–25 μm was investigated in order to understand the effects of particle size on glassy SCM reactivity. Isothermal calorimetry, chemical shrinkage, thermogravimetric analysis, and leaching tests were used to measure cement and glass dissolution and reactions. Images taken by scanning electronic microscope (SEM) in backscattered (BS) mode were analyzed to measure glass degree of hydration. In addition, mortar compressive strength and water absorption of samples containing glass powder at different curing temperatures and ages were used to relate reaction degree to performance. Results showed that hydration degree of the glass particles could be directly accounted for through linear correlation with particles surface area.

Hans J Schenk - One of the best experts on this subject based on the ideXlab platform.