Low Concentration

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Felix Escher - One of the best experts on this subject based on the ideXlab platform.

  • Influence of starch flavour interactions on rheological properties of Low Concentration starch systems
    Carbohydrate Polymers, 1995
    Co-Authors: Jeannette Nuessli, Béatrice Conde-petit, Ulrike Ruth Trommsdorff, Felix Escher
    Abstract:

    Abstract Interactions between starch and the complex forming flavour substances decanal and (—)fenchone were studied in Low Concentration starch systems. Rheological changes were determined with dynamic measurements, the formation of complexes by measuring the iodine binding capacity of starch and by X-ray diffractometry. Decanal and (—)fenchone led to the formation of amylose helices with 6 and 7 d -glycosyl units per turn, respectively, and induced the gelation of Low Concentration starch systems.

  • Gelation of Low Concentration starch systems induced by starch emulsifier complexation
    Food Hydrocolloids, 1992
    Co-Authors: Béatrice Conde-petit, Felix Escher
    Abstract:

    Abstract Starch-emulsifier interactions were studied in Low Concentration model starch dispersions prepared with glycerol monostearate (GMS) or lecithin (LEC). The degree of complex formation was determined by measuring the iodine binding capacity of starch; the rheological properties were investigated with dynamic and steady shear measurements. GMS formed insoluble starch inclusion complexes inducing starch gelation in 2% starch dispersions, provided that enough amylose was solubilized and swollen starch granules were present. LEC did not form complexes and failed to induce starch gelation.

Béatrice Conde-petit - One of the best experts on this subject based on the ideXlab platform.

  • Influence of starch flavour interactions on rheological properties of Low Concentration starch systems
    Carbohydrate Polymers, 1995
    Co-Authors: Jeannette Nuessli, Béatrice Conde-petit, Ulrike Ruth Trommsdorff, Felix Escher
    Abstract:

    Abstract Interactions between starch and the complex forming flavour substances decanal and (—)fenchone were studied in Low Concentration starch systems. Rheological changes were determined with dynamic measurements, the formation of complexes by measuring the iodine binding capacity of starch and by X-ray diffractometry. Decanal and (—)fenchone led to the formation of amylose helices with 6 and 7 d -glycosyl units per turn, respectively, and induced the gelation of Low Concentration starch systems.

  • Gelation of Low Concentration starch systems induced by starch emulsifier complexation
    Food Hydrocolloids, 1992
    Co-Authors: Béatrice Conde-petit, Felix Escher
    Abstract:

    Abstract Starch-emulsifier interactions were studied in Low Concentration model starch dispersions prepared with glycerol monostearate (GMS) or lecithin (LEC). The degree of complex formation was determined by measuring the iodine binding capacity of starch; the rheological properties were investigated with dynamic and steady shear measurements. GMS formed insoluble starch inclusion complexes inducing starch gelation in 2% starch dispersions, provided that enough amylose was solubilized and swollen starch granules were present. LEC did not form complexes and failed to induce starch gelation.

F S Sun - One of the best experts on this subject based on the ideXlab platform.

  • feasibility study of one axis three positions tracking solar pv with Low Concentration ratio reflector
    Energy Conversion and Management, 2007
    Co-Authors: B J Huang, F S Sun
    Abstract:

    Abstract A new PV design, called “one axis three position sun tracking PV module”, with Low Concentration ratio reflector was proposed in the present study. Every PV module is designed with a Low Concentration ratio reflector and is mounted on an individual sun tracking frame. The one axis tracking mechanism adjusts the PV position only at three fixed angles (three position tracking): morning, noon and afternoon. This “one axis three position sun tracking PV module” can be designed in a simple structure with Low cost. A design analysis was performed in the present study. The analytical results show that the optimal stopping angle β in the morning or afternoon is about 50° from the solar noon position and the optimal switching angle that controls the best time for changing the attitude of the PV module is half of the stopping angle, i.e. θH = β/2, and both are independent of the latitude. The power generation increases by approximately 24.5% as compared to a fixed PV module for latitude ϕ

Carol H. Collins - One of the best experts on this subject based on the ideXlab platform.

  • Reduction of Low Concentration Cr(VI) in acid solutions
    Science of The Total Environment, 1993
    Co-Authors: C. Archundia, P.s. Bonato, J. F. Lugo Rivera, L.c. Mascioli, K. E. Collins, Carol H. Collins
    Abstract:

    Abstract The speciation of chromium in natural waters presents problems of sampling, transport and storage, especially when the species are in Low Concentration. Typical sampling procedures involve filtration of aliquots of the water into acid-cleaned polyethylene bottles and storage at pH 2 for subsequent speciation. This study shows that, at Low Concentration, 51Cr(VI) is reduced to 51Cr(III) in acid solution at rates which depend strongly on both the chromium Concentration and on the acid Concentration. Thus, 20% of 10−6 mol/l 51Cr(VI) is reduced in 1 10 days at pH 4 while 45% is reduced at pH 2. More than 10% of 51Cr(VI) is reduced in day at pH 2 and in 1 h at pH 1. However, if the 51Cr(VI) Concentration is 10−4 mol/l or higher, only very small amounts are reduced in one day at ambient temperatures. All reductions produce a mixture of 51Cr(III) products, as shown by ion exchange chromatography. Such results suggest that Cr(VI)/Cr(III) speciation measurements of sampled waters may be compromised at very Low chromium Concentrations by the storage procedures commonly adopted and that alternative procedures should be considered for accurate speciation at Low Concentrations.

B J Huang - One of the best experts on this subject based on the ideXlab platform.

  • feasibility study of one axis three positions tracking solar pv with Low Concentration ratio reflector
    Energy Conversion and Management, 2007
    Co-Authors: B J Huang, F S Sun
    Abstract:

    Abstract A new PV design, called “one axis three position sun tracking PV module”, with Low Concentration ratio reflector was proposed in the present study. Every PV module is designed with a Low Concentration ratio reflector and is mounted on an individual sun tracking frame. The one axis tracking mechanism adjusts the PV position only at three fixed angles (three position tracking): morning, noon and afternoon. This “one axis three position sun tracking PV module” can be designed in a simple structure with Low cost. A design analysis was performed in the present study. The analytical results show that the optimal stopping angle β in the morning or afternoon is about 50° from the solar noon position and the optimal switching angle that controls the best time for changing the attitude of the PV module is half of the stopping angle, i.e. θH = β/2, and both are independent of the latitude. The power generation increases by approximately 24.5% as compared to a fixed PV module for latitude ϕ