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Florencia Cecilia Menegalli - One of the best experts on this subject based on the ideXlab platform.

  • nanocomposites based on banana starch reinforced with cellulose nanofibers isolated from banana peels
    Journal of Colloid and Interface Science, 2017
    Co-Authors: Franciele Maria Pelissari, Margarita Maria Andrademahecha, Paulo Jose Do Amaral Sobral, Florencia Cecilia Menegalli
    Abstract:

    Cellulose nanofibers were isolated from banana peel using a combination of chemical and mechanical treatments with different number of passages through the high-pressure homogenizer (0, 3, 5, and 7 passages). New nanocomposites were then prepared from a mixed suspension of banana starch and cellulose nanofibers using the casting method and the effect of the addition of these nanofibers on the properties of the resulting nanocomposites was investigated. The cellulose nanofibers homogeneously dispersed in the starch matrix increased the glass transition temperature, due to the strong intermolecular interactions occurring between the starch and cellulose. The nanocomposites exhibited significantly increased the tensile strength, Young's modulus, water-resistance, opacity, and crystallinity as the number of passages through the homogenizer augmented. However, a more drastic mechanical treatment (seven passages) caused defects in nanofibers, deteriorating the nanocomposite properties. The most suitable mechanical treatment condition for the preparation of cellulose nanofibers and the corresponding nanocomposite was five passages through the high-pressure homogenizer. In general, the cellulose nanofibers improved the features of the starch-based material and are potentially applicable as reinforcing elements in a variety of polymer composites.

Weiya Zhang - One of the best experts on this subject based on the ideXlab platform.

  • simple kohler Homogenizers for image forming solar concentrators
    7TH INTERNATIONAL CONFERENCE ON CONCENTRATING PHOTOVOLTAIC SYSTEMS: CPV-7, 2011
    Co-Authors: Roland Winston, Weiya Zhang
    Abstract:

    We demonstrate that the Kohler illumination technique can be applied to the image‐forming solar concentrators to solve the problem of “hot” spot and to generate the square irradiance pattern. The Kohler homogenizer can be simply a single aspheric lens optimized following a few guidelines. Two examples are given including a Fresnel lens based concentrator and a two‐mirror aplanatic system.

  • simple kohler Homogenizers for image forming solar concentrators
    Journal of Photonics for Energy, 2011
    Co-Authors: Roland Winston, Weiya Zhang
    Abstract:

    Image-forming solar concentrators which project an image of the sun on the photovoltaic cell may have high thermodynamic efficiency, but suffer from non-uniform irradiance distribution and a nonsquare irradiance pattern. In this paper we discuss how to apply the Kohler illumination technique to solve these problems with an optimization approach. Two examples, a Fresnel lens-based concentrator and a two-mirror aplanatic system, are shown for demonstration. The uniformity of these systems is greatly improved by adding simple Kohler Homogenizers in the form of aspheric lenses generated with our approach.

  • simple kohler Homogenizers for image forming solar concentrators
    Proceedings of SPIE, 2010
    Co-Authors: Weiya Zhang, Roland Winston
    Abstract:

    By adding simple Kohler Homogenizers in the form of aspheric lenses generated with an optimization approach, we solve the problems of non-uniform irradiance distribution and non-square irradiance pattern existing in some image-forming solar concentrators. The Homogenizers do not require optical bonding to the solar cells or total internal reflection surface. Two examples are shown including a Fresnel lens based concentrator and a two-mirror aplanatic system.

Joche Weiss - One of the best experts on this subject based on the ideXlab platform.

  • substitution of ice by a curing salt solution during meat batter production using the vane pump grinder technology
    Lwt - Food Science and Technology, 2016
    Co-Authors: Stefa Irmsche, Evamaria Terjung, Ku Herrma, Monika Gibis, Reinhard Kohlus, Joche Weiss
    Abstract:

    Abstract Extending vane pump-grinder systems by attaching a high-shear homogenizer enables the production of finely emulsified meat batters. The integration of an injection nozzle between grinder and high-shear homogenizer allows for a curing salt solution to be injected during meat emulsion production. In this study, we examined the effects of substituting crushed ice by a curing salt solution. We postulated that the injection of a salt solution instead of the addition of ice decreases the energy consumption of the size reduction units, since forces required to comminute the raw material mixture may decrease. To this purpose, the amount of crushed ice in the meat emulsion formulation was gradually substituted by a curing salt solution injected via the nozzle. Results show that the complete substitution of ice by injection of curing salt solution did not alter the product qualities, but that substantial energy savings of up to 25% during the production of finely dispersed meat emulsions were achieved. Specifically, the power consumption of the high-shear homogenizer decreased by up to 27%. Results should be of interest to meat product manufacturers looking for new approaches to reduce costs.

Roland Winston - One of the best experts on this subject based on the ideXlab platform.

  • simple kohler Homogenizers for image forming solar concentrators
    7TH INTERNATIONAL CONFERENCE ON CONCENTRATING PHOTOVOLTAIC SYSTEMS: CPV-7, 2011
    Co-Authors: Roland Winston, Weiya Zhang
    Abstract:

    We demonstrate that the Kohler illumination technique can be applied to the image‐forming solar concentrators to solve the problem of “hot” spot and to generate the square irradiance pattern. The Kohler homogenizer can be simply a single aspheric lens optimized following a few guidelines. Two examples are given including a Fresnel lens based concentrator and a two‐mirror aplanatic system.

  • simple kohler Homogenizers for image forming solar concentrators
    Journal of Photonics for Energy, 2011
    Co-Authors: Roland Winston, Weiya Zhang
    Abstract:

    Image-forming solar concentrators which project an image of the sun on the photovoltaic cell may have high thermodynamic efficiency, but suffer from non-uniform irradiance distribution and a nonsquare irradiance pattern. In this paper we discuss how to apply the Kohler illumination technique to solve these problems with an optimization approach. Two examples, a Fresnel lens-based concentrator and a two-mirror aplanatic system, are shown for demonstration. The uniformity of these systems is greatly improved by adding simple Kohler Homogenizers in the form of aspheric lenses generated with our approach.

  • simple kohler Homogenizers for image forming solar concentrators
    Proceedings of SPIE, 2010
    Co-Authors: Weiya Zhang, Roland Winston
    Abstract:

    By adding simple Kohler Homogenizers in the form of aspheric lenses generated with an optimization approach, we solve the problems of non-uniform irradiance distribution and non-square irradiance pattern existing in some image-forming solar concentrators. The Homogenizers do not require optical bonding to the solar cells or total internal reflection surface. Two examples are shown including a Fresnel lens based concentrator and a two-mirror aplanatic system.

Stefan Sinzinger - One of the best experts on this subject based on the ideXlab platform.

  • beam Homogenizers based on chirped microlens arrays
    Optics Express, 2007
    Co-Authors: Frank Wippermann, U D Zeitner, Peter Dannberg, Andreas Brauer, Stefan Sinzinger
    Abstract:

    Lens array arrangements are commonly used for the homogenization of highly coherent laser beams. These fly’s eye condenser configurations can be used to shape almost arbitrary input intensity distributions into a top hat. Due to the periodic structure of regular arrays the output intensity distribution is modulated by equidistant sharp intensity peaks which are disturbing the homogeneity. As a new approach we apply chirped microlens arrays to the beam shaping system. These are non-regular arrays consisting of individually shaped lenses defined by a parametric description which can be derived completely from analytical functions. The advantages of the new concept and design rules are presented.