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  • 1
    Electronic Resource
    Electronic Resource
    Variation in home range size along an elevational gradient in the iguanid lizard Sceloporus merriami (1987)
    Springer
    Oecologia 71 (1987), S. 473-480 
    Details
    ISSN: 1432-1939
    Keywords: Sceloporus ; Home range size ; Elevation activity period ; Population density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Variation in home range size among three populations of the saxicolous iguanid lizard Sceloporus merriami was studied in relation to density, food availability, behavioral patterns, and daily activity periods. These populations, separated by a maximum distance of 50 km, occur along an elevational gradient which spans the elevational range of the species in west Texas. The population with the smallest home ranges had the highest density, the lowest food availability, and the most restricted daily activity period. Within populations, males consistently had larger home ranges than females. No significant between-year variation in home range size was noted within a given area or sex. Intraspecific variation in home range size is not explained by any single factor, such as food availability or density, but appears to be complexly determined by the interaction of energetic, breeding, and activity constraints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378723
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  • 2
    Electronic Resource
    Electronic Resource
    Submicroscopic exsolution lamellae in pyroxenes in the Whin Sill, Northern England (1972)
    Springer
    Contributions to mineralogy and petrology 37 (1972), S. 211-220 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Optically homogeneous pigeonites and augites from Whin Sill dolerite cores from Throckley (Northumberland) are shown by electron microscopy to be unmixed. The lamellae are 40 Å wide at the margins of the sill and up to 3200 Å wide at the centre. Homogeneous pyroxenes also occur with a composition intermediate between the pigeonite and augite. Electron diffraction patterns of the unmixed grains show that the augite contains pigeonite lamellae and the pigeonite contains augite lamellae. From the application of simple diffusion theory it is suggested that the size of the lamellae is dependent on the rate of cooling of the sill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373069
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  • 3
    Electronic Resource
    Electronic Resource
    Evolved gas analysis (EGA) of brick clays (1997)
    Springer
    Journal of thermal analysis and calorimetry 48 (1997), S. 49-62 
    Details
    ISSN: 1572-8943
    Keywords: brick clays ; EGA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Using a system based on non-dispersive infrared (NDIR) detectors, evolved gas analysis (EGA) was able to identify and quantify the principal volatiles produced by heating powdered samples of UK brick clays. From these results, atmospheric emissions likely to result from brick production can be predicted. In addition, EGA results for extruded brick clay test pieces are significantly different from those of powdered samples. Within an extruded brick clay body, evolved gases are contained within a pore system and evolved gas-solid phase reactions also occur. This EGA study provides further evidence on the nature of firing reactions within brick clay bodies. The qualitative and quantitative influence of heating rate — a key process condition in brick manufacture — on gas release is also outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01978965
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  • 4
    Electronic Resource
    Electronic Resource
    Economic potential of the ultramafic rocks of Jamaica and Tobago: two contrasting geological settings in the Caribbean (1999)
    Springer
    Mineralium deposita 34 (1999), S. 718-723 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Ultramafic rocks in Jamaica are dunites with minor lherzolite, often serpentinised, and are part of a dismembered ophiolite complex. In Tobago, dunites, wehrlites, pyroxenites and hornblendites form the lower part of a plutonic complex of island arc affinity. The mineral assemblages and chemistry reflect these differences. Chromite in Jamaica is high in Al and Mg, whereas in Tobago it is rich in Fe, as in Alaskan-type intrusives. Ni-Cu-PGE assemblages in Jamaica are pentlandite, with later low temperature heazlewoodite, awaruite and native copper, the latter with Pt and Pd. In Tobago an assemblage of pentlandite, pyrrhotite, pyrite and chalcopyrite is much less affected by later alteration. PGE phases also occur. The dunites in Jamaica have sufficient MgO to be a potential source of olivine. The higher Fe in olivine from Tobago indicates that olivine cumulates in plutonics from island arc settings are a less suitable source of the mineral. Ni-laterites in Jamaica are unlikely because of high topographic relief. The prospect for Ni-laterites in Tobago is low as there is little Ni in the olivines. Chrysotile asbestos, talc and magnesite are absent in both islands. This is probably a consequence of the lack of secondary serpentine recrystallisation to form fibrous chrysotile veins, the deep tectonic level and lack of hydrothermal circulation for magnesite to form, and the absence of metamorphic/metasomatic events and/or late stage extension tectonics which might have yielded talc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001260050230
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  • 5
    Electronic Resource
    Electronic Resource
    Heulandite and mordenite-rich tuffs from Greece: a potential source for pozzolanic materials (1996)
    Springer
    Mineralium deposita 31 (1996), S. 576-583 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The microcystalline mass of the Pliocene tuffs of Santorini and Polyegos islands, in the South Aegean Volcanic Arc, Greece, is very rich in zeolite minerals, more specifically heulandite type 3, i.e. clinoptilolite, and mordenite. In Santorini, clinoptilolite is the dominant authigenic phase and it was formed in a semi-closed system, by the activity of interstitial water within the volcaniclastic sequence. In Polyegos, mordenite dominates and it was formed by hydrothermal alteration of pyroclastics. Experiments described in this work show that the presence of the zeolite minerals has created materials with excellent pozzolanic properties. Tuffs from the two areas were calcined at 760 °C and for 12 h and then mixed with lime in a constant ratio of 1 part lime to 3 parts calcined tuff. As a result, the free lime content of the lime-calcined tuff mixtures was reduced from 25% to 2.05% (Santorini) and 1.31 % (Polyegos). Compressive strength tests were carried out on concrete cubes made with 100% Portland cement as the cementitious agent, to be used as reference cubes, and concrete cubes in which the Portland cement has been replaced in 4% and 7% proportions by the calcined tuff as pozzolans. The free lime estimation and the compressive strength tests were all carried out in accordance with the British Standards Institution (BS 4550 and BS 1881) guidelines. Early stage measurements of the compressive strength showed that pozzolan-bearing concrete cubes reached values as high as 140% of the reference cubes. The pozzolan-bearing concrete cubes maintained this superior strength throughout the entire one year period of the experiments. After 360 days, they finally maintained 107% of the compressive strength of the reference cubes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196138
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  • 6
    Electronic Resource
    Electronic Resource
    Heulandite and mordenite-rich tuffs from Greece: a potential source for pozzolanic materials (1996)
    Springer
    Mineralium deposita 31 (1996), S. 576-583 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract.  The microcystalline mass of the Pliocene tuffs of Santorini and Polyegos islands, in the South Aegean Volcanic Arc, Greece, is very rich in zeolite minerals, more specifically heulandite type 3, i.e. clinoptilolite, and mordenite. In Santorini, clinoptilolite is the dominant authigenic phase and it was formed in a semi-closed system, by the activity of interstitial water within the volcaniclastic sequence. In Polyegos, mordenite dominates and it was formed by hydrothermal alteration of pyroclastics. Experiments described in this work show that the presence of the zeolite minerals has created materials with excellent pozzolanic properties. Tuffs from the two areas were calcined at 760 °C and for 12 h and then mixed with lime in a constant ratio of 1 part lime to 3 parts calcined tuff. As a result, the free lime content of the lime-calcined tuff mixtures was reduced from 25% to 2.05% (Santorini) and 1.31% (Polyegos). Compressive strength tests were carried out on concrete cubes made with 100% Portland cement as the cementitious agent, to be used as reference cubes, and concrete cubes in which the Portland cement has been replaced in 4% and 7% proportions by the calcined tuff as pozzolans. The free lime estimation and the compressive strength tests were all carried out in accordance with the British Standards Institution (BS 4550 and BS 1881) guidelines. Early stage measurements of the compressive strength showed that pozzolan-bearing concrete cubes reached values as high as 140% of the reference cubes. The pozzolan-bearing concrete cubes maintained this superior strength throughout the entire one year period of the experiments. After 360 days, they finally maintained 107% of the compressive strength of the reference cubes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001260050064
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    Paper (German National Licenses)
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