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  • Commercial fertilizer  (1)
  • blends  (1)
  • distributions of relaxation times  (1)
  • investigational allowances  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Statistical methodology for setting legal allowances for nutrient contents of bagged fertilizer materials in the State of North Carolina (1988)
    Springer
    Nutrient cycling in agroecosystems 18 (1988), S. 71-99 
    Details
    ISSN: 1573-0867
    Keywords: Commercial fertilizer ; hierarchical sampling ; investigational allowances ; legal allowances ; sampling ; tolerances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The process of establishing investigational allowances for fertilizer materials is reviewed. All sources of variation incurred in taking, preparing and analyzing an official sample of fertilizer are considered. The importance of both theoretical and practical considerations is discussed. Use of the techniques described is illustrated using a set of data involving five grades of commercial fertilizer. Sampling was by a hierarchical scheme. Estimates of variance components from these data were used in the estimation of the investigational allowances. Economic losses to the State of North Carolina, the farmers, and the manufacturer were estimated using various assumed prices and legal allowance establishment procedures. Setting the investigational allowances at 2.33 standard errors is confirmed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01064180
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polymer solid electrolytes from the PEG-PMMA-LiCF3SO3 system (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 2221-2233 
    Details
    ISSN: 0887-6266
    Keywords: poly(ethylene glycol) ; ethylene oxide-propylene oxide copolymer ; blends ; poly(methyl methacrylate) ; LiCF3SO3 ; ionic conductivity ; effective medium theory ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Highly conductive solid polymeric electrolytes based upon low molecular weight poly(ethylene glycol) and ethylene oxide/propylene oxide copolymers blended with up to 50% by volume of poly(methyl methacrylate) have been synthesized using LiCF3SO3 (25:1 ether oxygen to cation ratio). Room-temperature ionic conductivities were measured to be in the range 10-4 to 10-5 S/cm for poly(methyl methacrylate) concentrations up to 30% by volume. In some cases, the addition of the poly(methyl methacrylate) enhanced the conductivity. All of the electrolytes studied were either amorphous or crystallized below 0°C. The variation of conductivity with temperature and polymer composition was measured and the results were analyzed in terms of effective medium theory and semiempirical considerations. Ionic transport is coupled to the structural relaxation of the polymer segments. At lower temperatures activated processes were required. Both charge carrier mobility and charge concentration were found to contribute to conduction. The effective medium theory quantitatively describes conductivities of amorphous heterogenous systems of limited miscibility (microphase separation) quite well. For miscible or partially crystalline systems other effects not incorporated in this theory play an important role, and conductivities are measured to be higher than theoretically predicted. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090321309
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photon correlation spectroscopy of syndiotactic poly (n-butyl methacrylate) near the glass transition (1994)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 32 (1994), S. 1137-1147 
    Details
    ISSN: 0887-6266
    Keywords: light scattering ; glass transition ; distributions of relaxation times ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Slow relaxing longitudinal density fluctuations in bulk syndiotactic poly (n-butyl methacrylate) [PBMA] were studied by photon correlation spectroscopy as a function of temperature from 70 to 90°C. The shape of the light-scattering relaxation function broadened as the temperature approached the glass transition (Tg = 55°C). The average relaxation time shifted with temperature, consistent with previous studies of PBMA. The relaxation functions were analyzed in terms of a distribution of relaxation rates. The calculated distribution was clearly bimodal and the shape altered with temperature. The higher frequency peak in the distribution corresponds well with previous mechanical and dielectric relaxation studies of the intramolecular relaxation of the acrylate ester side chain. The resolution of the distribution into two modes is due to a well-defined side-chain motion with relaxation strength comparable to the primary glass-rubber relaxation. © 1994 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1994.090320701
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    Paper (German National Licenses)
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