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  • 1
    Electronic Resource
    Electronic Resource
    The relationship between field-saturated hydraulic conductivity and soil structure: development of class pedotransfer functions (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 16 (2000), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. A method to predict field-saturated hydraulic conductivity (Kfs) from soil structure, as described in soil profile descriptions, was developed using 627 Kfs measurements. As the soil structure classes used are very similar to an international classification (FAO, 1990), the derived relationships (class pedotransfer functions) could be widely applicable. A total of 49 unique combinations of primary and secondary structures were identified but the relationship between these structures and Kfs was poor. However, this relationship became clearer when the structures were grouped according to both the ped size and ped orientation. It improved further with the removal of data from horizons with significant amounts of vertically orientated angular stones or very coarse roots. Soils with vertically orientated peds larger than 50 mm had a geometric mean conductivity of 0.33 cm day−1 while those with fractures in both the horizontal and vertical planes had a geometric mean conductivity of 4.1 cm day−1. Soils with peds between 20 and 50 mm had a geometric mean conductivity of 17.9 cm day−1 and those with peds 〈20 mm had a geometric mean conductivity of 53.0 cm day−1. Those soils with only horizontally orientated structures proved to be anomalous in that the conductivity increased as ped size increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.2000.tb00174.x
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  • 2
    Electronic Resource
    Electronic Resource
    The determination of field-saturated hydraulic conductivity in some Scottish soils using the Guelph permeameter (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 10 (1994), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Soil hydraulic conductivities are frequently required for process-based modelling of the soil water regime. Field-saturated hydraulic conductivity was measured with the Guelph permeameter in 10 soil series with a range of structures and textures. The permeameter offers a range of options for calculating conductivities depending on soil conditions, particularly homogeneity of pore distribution within each horizon. However, even horizons described as massive or apedal were not sufficiently homogeneous to satisfy the boundary conditions entirely.Hydraulic conductivities were calculated by the one head, fixed α* procedure; α* is an index of capillarity. No direct correlations were found between hydraulic conductivity and land use. However, the average hydraulic conductivity of coarse textured topsoils which were mainly under arable agriculture was less than that of the finer textured topsoils largely under grassland. Even limited structural development increased the hydraulic conductivities of fine textured, compact subsurface horizons. It is important to match the adopted procedure to the soil conditions both during the determination of flow rates in the field and in the subsequent analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.1994.tb00462.x
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  • 3
    Electronic Resource
    Electronic Resource
    A soil carbon and land use database for the United Kingdom (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 21 (2005), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. The compilation of a database of soil carbon and land use is described, from which models of soil carbon dioxide emissions across the United Kingdom (UK) can be run. The database gives soil organic carbon, sand, silt and clay contents and bulk densities weighted to reference layers from 0 to 30 cm and from 30 to 100 cm depths. The data are interpolated from information on soil types and land use on a 1 km grid across the UK and are used to estimate soil carbon stocks. For 1990, the baseline year for the Kyoto Protocol on carbon emissions, the estimate is 4562 Tg soil organic carbon in the top 1 m of soil across the UK, with an average density of 18 kg m−2. The data can be reported by layer (e.g. 54% in topsoils) and country (e.g. 48% in Scotland) as well as by soil and land type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1079/SUM2005351
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  • 4
    Electronic Resource
    Electronic Resource
    X-Ray Diffractometer Gear-Changing Mechanism (1960)
    s.l. : American Chemical Society
    Analytical chemistry 32 (1960), S. 893-893 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60163a059
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  • 5
    Electronic Resource
    Electronic Resource
    Theoretical studies of electronic properties of polyacene, poly(1,4-dihydrobenzo-1,4-dihydrobenzene), poly(p-phenylene), poly(p-1,4-dihydrobenzene), and their hetero (N, O, and S) substituted derivatives (1987)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 4149-4157 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00248a004
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of soliton-like excitations in trans-polyacetylene (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2049-2056 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In the study reported here, unrestricted Hartree–Fock calculations were performed on the ground state and several soliton-like defect states of the model large polyene, trans-polyacetylene. The calculations included the use of the random phase approximation to obtain screened electron repulsion integrals and projection of the UHF eigenfunctions to obtain pure spin states. The trans-polyacetylene ground state geometry is characterized here by alternating double and single bonds with lengths of 1.456 and 1.369 A(ring), respectively. Calculations on model soliton-like defect states yielded functional forms for the bond alternation, spin density, and charge density defects which are consistent with the soliton model for trans-polyacetylene and are similar to those reported elsewhere. The average positive and average negative spin density on chains containing neutral kink defects are 0.045 and −0.011, respectively. These values are in fair agreement with the best experimental estimates of 0.06 and −0.02.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454081
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  • 7
    Electronic Resource
    Electronic Resource
    The development of a hydrological classification of UK soils and the inherent scale changes. (1998)
    Springer
    Nutrient cycling in agroecosystems 50 (1998), S. 299-302 
    Details
    ISSN: 1573-0867
    Keywords: HOST ; hydrology ; soil ; pedotransfer ; scaling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Although soil is of major importance in influencing river hydrology, there is often a lack of soil hydrological data available to quantify the ameliorating effects of soil on steam flow. The HOST classification (Hydrology of Soil Types) was developed using pedotransfer rules and functions to derive a set of semi-quantified soil attributes from existing soil morphological information as surrogates for the missing hydraulic data. The rules were applied to the soil horizon information and were scaled to the catchment level through the known relationships between soil horizons and soil taxonomic units and between soil taxonomic units and 1:250 000 scale soil map units. The resulting classification, however, is not scale-specific and is capable of predicting river flow indices at the catchment scale (r2 = 0.79) and of predicting the dominant pathways of water movement through individual soil profiles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009765000837
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  • 8
    Electronic Resource
    Electronic Resource
    Soil P resources, plant growth and rooting characteristics in nutrient poor upland grasslands (1994)
    Springer
    Plant and soil 163 (1994), S. 257-266 
    Details
    ISSN: 1573-5036
    Keywords: cambisol ; mixed upland grassland ; organic phosphorus ; P resources ; P uptake ; roots ; yields
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field study was undertaken to establish the demand for P by mixed herbage, manipulated by cutting regimes, and the extent to which orthophosphate alone in soil solution could meet this demand from three cambisols derived from different parent materials. Differences in soil types were sufficient to produce significantly different rooting patterns at each site. Yields for 7-and 10-cm treatments generally exceeded those for swards cut to 2-and 4-cm. The highest yields were from plots cut once at the end of the season, or when herbage was cut in June and October only. Yields fell in the second season by an average of 30%. Two cuts in the season resulted in almost twice the P uptake compared with other treatments, leading to the view that a “silage” cut stimulated root growth. Rooting was deepest in Tarves Association soil (Dystric cambisol), densest in Insch Association soil (Eutric cambisol) and intermediate in Foudland Association soil (Dystric cambisol) but herbage yield at each site was similar. Whole season mean P and N content in roots ranged from 1.0 to 3.4 and from 8.1 to 27.9 mg g−1 dry weight, respectively. The lowest values were in once cut herbage and were half those in herbage cut in June and October only. Data for the total P resources of the soils, extractable P, and shoot and root P at each site are presented together with data for P in soil solution (principally organic) from an associated soil solution study. There was a disparity between daily uptake and orthophosphate in soil solution. These findings suggested that it was probable that soluble organic forms of P are important for P nutrition in these nutrient poor soils, and could account for the excess of observed P uptake (from soils low in P) over that predicted by mechanistic mathematical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007975
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  • 9
    Electronic Resource
    Electronic Resource
    Combination of MOMM and VEH methods to calculate electronic properties of polymers (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 8 (1987), S. 107-116 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: A Molecular-Orbital-Based Molecular Mechanics method (MOMM) has been employed to calculate the structures of cyclopentadiene, pyrrole, furan, thiophene, dibenzocyclopentadiene (fluorene), dibenzopyrrole, dibenzofuran, and dibenzothiophene. The dimer structures of the above compounds have also been calculated using the same method to derive the unit cells of polycyclopentadiene, polypyrrole, polyfuran, polythiophene, polydibenzocyclopentadiene, polydibenzopyrrole, polydibenzofuran, and polydibenzothiophene. The band structures, densities of states, ionization potentials, band gaps, reduction potentials, and oxidation potentials of these polymers then have been calculated by using the Valence Effective Hamiltonian method (VEH). The structural effects on electronic properties are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540080203
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  • 10
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    Probabilistic Approach to the Identification of Input Variables to Estimate Hydraulic Conductivity (2008)
    Wiley
    Details
    Publication Date: 2008-01-01
    Print ISSN: 0361-5995
    Electronic ISSN: 1435-0661
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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