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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Canned whole tomatoes and beets were collected from three canning plants in the Rio Grande Valley of South Texas, 3 times during the canning period and stored for 1 yr. Nutrient analyses revealed that fat, fiber, protein, iron, riboflavin, niacin, carbohydrate and caloric values of the tomatoes and ash, fat, fiber, calcium, iron, protein, thiamine, riboflavin and niacin of the beets were not changed by canning plant procedures, time of harvest during the canning period, or during 1 yr of storage. Tomatoes canned in plant C were consistently higher in total dry solids than those canned in plants A and B. The total dry solids in beets decreased slightly in the late harvest. Vitamin C decreased in tomatoes from each canning plant during storage. The ash content of tomatoes canned in plant A was lower than ash in tomatoes from plants B and C. Vitamin A in tomatoes increased in late harvest but decreased during storage. Beets canned in plants A and B decreased in carbohydrate and caloric values during the canning period. Canning plant operators in this subtropical area might expect values for fat and Vitamin A in tomatoes and of fat, calcium, iron, thiamine and riboflavin in beets to differ from the corresponding values listed in USDA Handbook No. 8.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-1528
    Keywords: Steady shearviscosity ; suspension ; filledpolymer melt ; yield stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Filled polymeric liquids often exhibit apparent yielding and shear thinning in steady shear flow. Yielding results from non-hydrodynamic particle—particle interactions, while shear thinning results from the non-Newtonian behavior of the polymer melt. A simple equation, based on the linear superposition of two relaxation mechanisms, is proposed to describe the viscosity of filled polymer melts over a wide range of shear rates and filler volume fraction. The viscosity is written as the sum of two generalized Newtonian liquid models. The resulting equation can describe a wide range of shear-thinning viscosity curves, and a hierarchy of equations is obtained by simplifying the general case. Some of the parameters in the equation can be related to the properties of the unfilled liquid and the solid volume fraction. One adjustable parameter, a yield stress, is necessary to describe the viscosity at low rates where non-hydrodynamic particle—particle interaction dominate. At high shear rates, where particle—particle interactions are dominated by interparticle hydrodynamics, no adjustable parameters are necessary. A single equation describes both the high and low shear rate regimes. Predictions of the equation closely fit published viscosity data of filled polymer melts.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 341-348 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Magnetic resonance imaging (MRI) has been used to study solid rocket propellants and liner material. The samples studied were simulants, used mainly for safety reasons, of real systems using ammonium sulfate in place of the energetic materials. The polymeric binder was hydroxy-terminated poly(butadiene) (HTPB) reacted with isopherone diisocyanate. MRI was used to observe variations in intensity in the simulant samples due to differing percentages of solids loading. It also showed the homogeneous intensity obtained for an unfilled sample used for comparison with the 82% filled material. The liner material, HTPB and dimeryl diisocyanate, was imaged despite its relative rigidity observed from its short T2 value. Samples of poly(alkylene) oxide simulants were imaged, and various bubbles and regions of filler inhomogeneity were observed. These defects were correlated with photo-micrographs of the sample. MRI can be used to image real systems of solid rocket components. © 1996 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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