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  • Egypt
  • Carbon sequestration
  • Springer  (81)
  • American Association for the Advancement of Science  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Identification of four components from the female sex pheromone of the lima-bean pod borer, Etiella zinckenella (1989)
    Springer
    Entomologia experimentalis et applicata 51 (1989), S. 107-112 
    Details
    ISSN: 1570-7458
    Schlagwort(e): sex pheromone ; lima-bean pod borer ; Etiella zinckenella ; Lepidoptera ; Phycitidae ; (Z)-11-tetradecenyl acetate ; (E)-11-tetradecenyl acetate ; (Z)-9-tetradecenyl acetate ; tetradecyl acetate ; Hungary ; Egypt
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Résumé A partir de femelles d'E. zinckenella d'origines hongroise et égyptienne, nous avons isolé quatre composés par chromatographie en phase gazeuse avec ionisation de flamme et électroantennographie (EAD): l'acétate de tétradécanyl, l'acétate (Z)-11-tétradécényl, l'acétate (E)-11-tétradécényl et l'acétate (Z)-11-tétradécényl. Les acétates monoinsaturés donnent les meilleures réponses en EAG parmi une série d'acétates tétradécényls et de tétradécénols. Les quatre composés mélangés dans les mêmes proportions que dans l'extrait de la phéromone ont attiré un nombre significatif de mâles tant en Egypte qu'en Hongrie. Dans un test préliminaire de soustraction, la meilleure capture a été réalisée par le mélange ternaire d'acétates monoinsaturés.
    Notizen: Abstract Four compounds, tetradecyl acetate, (Z)-9-tetradecenyl acetate, (E)-11-tetradecenyl acetate and (Z)-11-tetradecenyl acetate were identified from female sex pheromone extracts of Hungarian and Egyptian lima-bean pod borers (Etiella zinckenella Tr., Lepidoptera: Phycitidae) by gas chromatography with flame ionization (FID) and electroantennographic (EAD) detection. In EAG studies these monoun-saturated acetates gave the best responses in a series of other tetradecenyl acetates and tetradecenols. The four component blend of the identified components in similar ratios as in the pheromone extract attracted significant numbers of male lima-bean pod borers in both Hungary and Egypt. In a preliminary subtraction test best capture was achieved by the ternary mixture of the monounsaturated acetates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00186727
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  • 2
    Digitale Medien
    Digitale Medien
    The Cultural Specificity of Management Constructs: An Empirical Examination (1997)
    Springer
    International journal of value-based management 10 (1997), S. 247-271 
    Details
    ISSN: 1572-8528
    Schlagwort(e): Egypt ; culture ; management ; job satisfaction ; organizational commitment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Wirtschaftswissenschaften
    Notizen: Abstract The management literature reports on numerous studies examining relationships among the variables of job satisfaction and organizational commitment, and more recently organizational character, organizational citizenship behavior, and propensity for participative decision making. The present study empirically examines relationships among these constructs among Egyptian managers. Although general support was demonstrated for the previously validated scales, the evidence suggests that these constructs are culturally specific and must be redefined, especially in emerging countries. Further, findings support some, but not all of the conclusions typically reached in existing studies of Western managers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007701229378
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  • 3
    Digitale Medien
    Digitale Medien
    Mitigation of atmospheric CO2 concentrations by increased carbon sequestration in the soil (1998)
    Springer
    Biology and fertility of soils 27 (1998), S. 230-235 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Key words Carbon dioxide ; Carbon sequestration ; Climate change ; Greenhouse gases ; Mitigation options
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract  The International Panel on Climate Change distinguished three main options for the mitigation of atmospheric CO2 concentrations by the agricultural sector: (1) reduction of agriculture-related emissions, (2) creation and strengthening of C sinks in the soil, and (3) production of biofuels to replace fossil fuels. Options for sustained sequestration of C in the soil through adapted management of land resources are reviewed in the context of the ongoing discussion on the need to reduce greenhouse gas concentrations in the atmosphere. Enhanced sequestration of atmospheric CO2 in the soil, ultimately as stable humus, may well prove a more lasting solution than (temporarily) sequestering CO2 in the standing biomass through reforestation and afforestation. Such actions will also help to reverse processes of land degradation, thus contributing to sustained food productivity and security for the people in the regions concerned.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003740050425
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  • 4
    Digitale Medien
    Digitale Medien
    Regional estimates of carbon sequestration potential: linking the Rothamsted Carbon Model to GIS databases (1998)
    Springer
    Biology and fertility of soils 27 (1998), S. 236-241 
    Details
    ISSN: 1432-0789
    Schlagwort(e): Key words Soil organic carbon ; Geographical Information Systems ; Modelling ; Carbon sequestration ; Hungarian soils
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract  Soil organic matter (SOM) represents a major pool of carbon within the biosphere. It is estimated at about 1400 Pg globally, which is roughly twice that in atmospheric CO2. The soil can act as both a source and a sink for carbon and nutrients. Changes in agricultural land use and climate can lead to changes in the amount of carbon held in soils, thus, affecting the fluxes of CO2 to and from the atmosphere. Some agricultural management practices will lead to a net sequestration of carbon in the soil. Regional estimates of the carbon sequestration potential of these practices are crucial if policy makers are to plan future land uses to reduce national CO2 emissions. In Europe, carbon sequestration potential has previously been estimated using data from the Global Change and Terrestrial Ecosystems Soil Organic Matter Network (GCTE SOMNET). Linear relationships between management practices and yearly changes in soil organic carbon were developed and used to estimate changes in the total carbon stock of European soils. To refine these semi-quantitative estimates, the local soil type, meteorological conditions and land use must also be taken into account. To this end, we have modified the Rothamsted Carbon Model, so that it can be used in a predictive manner, with SOMNET data. The data is then adjusted for local conditions using Geographical Information Systems databases. In this paper, we describe how these developments can be used to estimate carbon sequestration at the regional level using a dynamic simulation model linked to spatially explicit data. Some calculations of the potential effects of afforestation on soil carbon stocks in Central Hungary provide a simple example of the system in use.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003740050426
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  • 5
    Digitale Medien
    Digitale Medien
    Age and tectonic setting of granitoid gneisses in the Eastern Desert of Egypt and south-west Sinai (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 502-513 
    Details
    ISSN: 1437-3262
    Schlagwort(e): Eastern Desert ; Egypt ; Granitoid gneisses ; Single zircon dating
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Strongly deformed and locally migmatized gneisses occur at several places in the southern Eastern Desert of Egypt and in Sinai and have variously been interpreted as a basement to Pan-african (≈900 to 600 Ma) supracrustal and intrusive assemblages. A suite of grabbroic to granitic gneisses was investigated in the Hafafit area, which constitutes an I-type calc-alkaline intrusive assemblage whose chemistry suggests emplacement along an active continental margin and whose granitoid members can be correlated with the so-called ‘Older Granites’ of Egypt.207Pb/206Pb single zircon evaporation from three samples of the Hafafit gneisses yielded protolith emplacement ages between 677 ± 9 and 700 ± 12 Ma and document granitoid activity over a period of about 23 Ma. A migmatitic granitic gneiss from Wadi Bitan, south-west of Ras Banas, has a zircon age of 704 ± 8 Ma, and its protolith was apparently generated during the same intrusive event as the granitoids at Hafafit. Single zircons from a dioritic gneiss from Wadi Feiran in south-west Sinai suggest emplacement of the protolith at 796 ± 6 Ma and this is comparable with ages for granitoids in north-east Sinai and southern Israel. None of the above gneisses is derived from remelting of older continental crust, but they are interpreted as reflecting subduction-related calc-alkaline magmatism during early Pan-african magmatic arc formation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01083223
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  • 6
    Digitale Medien
    Digitale Medien
    Phanerozoic evolution of the basins of Northern Egypt and adjacent areas (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 728-742 
    Details
    ISSN: 1437-3262
    Schlagwort(e): Basin dynamics ; Biostratigraphy ; Well data ; Geophysical data ; Egypt
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract The results of integrating geological well data and geophysical information from the subsurface of northern Egypt are presented in terms of basin dynamics. Recent biostratigraphic data from wells and scarce outcrops are shown to be critical to an understanding of syndepositional tectonics. Six tectonostratigraphic phases of basin evolution are recognized to span the Phanerozoic. These phases initially record the development of intracratonic subsidence, controlled by deep crustal strike-slip tectonics, as Nubian continental and Tethyan marine influences competed across the northern margin of Gondwanaland. Evidence is also presented for the formation of the present day continental margin to northern Egypt. After a phase of crustal stretching, oceanic rifting focused on the western margin of the Arabian Platform, propagating progressively westwards during the Early-Mid-Jurassic. Thereafter, the effects of passive subsidence on the continental margin were disturbed by discrete phases of intracratonic strike-slip, associated ‘Syrian Arc’ folding, and the formation of deep basins in the opening Red Sea and Gulf of Suez. Three structural fabrics persisted throughout Phanerozoic basin evolution, the result of repeated extensional reactivation and inheritance from Pan-African basement.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00251071
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  • 7
    Digitale Medien
    Digitale Medien
    A structural synthesis of the Proterozoic Arabian-Nubian Shield in Egypt (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 484-501 
    Details
    ISSN: 1437-3262
    Schlagwort(e): Arabian-Nubian Shield ; Egypt ; Pan-African orogeny ; Proterozoic ; Extensional collapse ; Thrust tectonics ; Transpression
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Detailed structural geological and related studies were carried out in a number of critical areas in the Proterozoic basement of eastern Egypt to resolve the structural pattern at a regional scale and to assess the general characteristics of tectonic evolution, orogeny and terrane boundaries. Following a brief account of the tectonostratigraphy and timing of the orogenic evolution, the major structural characteristics of the critical areas are presented. Collisional deformation of the terranes ended about 615-600 Ma ago. Subsequent extensional collapse probably occurred within a relatively narrow time span of about 20 Ma (575 – 595 Ma ago) over the Eastern Desert and was followed by a further period of about 50 Ma of late to post-tectonic activity. The regional structures originated mainly during post-collisional events, starting with those related to extensional collapse (molasse basin formation, normal faulting, generation of metamorphic core complexes). Subsequent NNW-SSE shortening is documented by large-scale thrusting (towards the NNW) and folding, distributed over the Eastern Desert, although with variable intensity. Thrusts are overprinted by transpression, which was localized to particular shear zones. Early transpression produced, for example, the Allaqi shear zone and final transpression is documented in the Najd and Wadi Kharit-Wadi Hodein zones. Two terrane boundaries can be defined, the Allaqi and South Hafafit Sutures, which are apparently linked by the high angle sinistral strike-slip Wadi Kharit-Wadi Hodein shear zone with a tectonic transport of about 300 km towards the W/NW. In general, the tectonic evolution shows that extensional collapse is not necessarily the final stage of orogeny, but may be followed by further compressional and transpressional tectonism. The late Pan-African high angle faults were reactivated during Red Sea tectonics both as Riedel shears and normal faults, where they were oriented favourably with respect to the actual stress regime.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00194156
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  • 8
    Digitale Medien
    Digitale Medien
    A structural synthesis of the Proterozoic Arabian-Nubian Shield in Egypt (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 484-501 
    Details
    ISSN: 1437-3262
    Schlagwort(e): Arabian-Nubian Shield ; Egypt ; Pan-African orogeny ; Proterozoic ; Extensional collapse ; Thrust tectonics ; Transpression
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Detailed structural geological and related studies were carried out in a number of critical areas in the Proterozoic basement of eastern Egypt to resolve the structural pattern at a regional scale and to assess the general characteristics of tectonic evolution, orogeny and terrane boundaries. Following a brief account of the tectonostratigraphy and timing of the orogenic evolution, the major structural characteristics of the critical areas are presented. Collisional deformation of the terranes ended about 615-600 Ma ago. Subsequent extensional collapse probably occurred within a relatively narrow time span of about 20 Ma (575 – 595 Ma ago) over the Eastern Desert and was followed by a further period of about 50 Ma of late to post-tectonic activity. The regional structures originated mainly during post-collisional events, starting with those related to extensional collapse (molasse basin formation, normal faulting, generation of metamorphic core complexes). Subsequent NNW-SSE shortening is documented by large-scale thrusting (towards the NNW) and folding, distributed over the Eastern Desert, although with variable intensity. Thrusts are overprinted by transpression, which was localized to particular shear zones. Early transpression produced, for example, the Allaqi shear zone and final transpression is documented in the Najd and Wadi Kharit-Wadi Hodein zones. Two terrane boundaries can be defined, the Allaqi and South Hafafit Sutures, which are apparently linked by the high angle sinistral strike-slip Wadi Kharit-Wadi Hodein shear zone with a tectonic transport of about 300 km towards the W/NW. In general, the tectonic evolution shows that extensional collapse is not necessarily the final stage of orogeny, but may be followed by further compressional and transpressional tectonism. The late Pan-African high angle faults were reactivated during Red Sea tectonics both as Riedel shears and normal faults, where they were oriented favourably with respect to the actual stress regime.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01083222
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  • 9
    Digitale Medien
    Digitale Medien
    A model for the three-dimensional evolution of continental rift basins, north-east Africa (1994)
    Springer
    International journal of earth sciences 83 (1994), S. 671-688 
    Details
    ISSN: 1437-3262
    Schlagwort(e): Continental rift models ; Extensional tectonics ; Reflection seismic profiles ; North-east Africa Sudan ; Kenya ; Egypt ; Red Sea
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract Large areas of north-east Africa were dominated by regional extension in the Late Phanerozoic. Widespread rifting occurred in the Late Jurassic, with regional extension culminating in the Cretaceous and resulting in the greatest areal extent and degree of interconnection of the west, central and north African rift systems. Basin reactivation continued in the Paleocene and Eocene and new rifts probably formed in the Red Sea and western Kenya. In the Oligocene and Early Miocene, rifts in Kenya, Ethiopia and the Red Sea linked and expanded to form the new east African rift system. This complex history of rifting resulted in failed rift basins with low to high strain geometries, a range of associated volcanism and varying degrees of interaction with older structures. One system, the Red Sea rift, has partially attained active seafloor spreading. From a comparison of these basins, a general model of three-dimensional rift evolution is proposed. Asymmetrical crustal geometries dominated the early phases of these basins, accompanied by low angle normal faulting that has been observed at least locally in outcrop. As rifting progressed, the original fault and basin forms were modified to produce larger, more through-going structures. Some basins were abandoned, others experienced reversals in regional dip and, in general, extension and subsidence became focused along narrower zones near the rift axes. The final transition to oceanic spreading was accomplished in the Red Sea by a change to high angle, planar normal faulting and diffuse dike injection, followed by the organization of an axial magma chamber.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00251067
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  • 10
    Digitale Medien
    Digitale Medien
    Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt (2000)
    Springer
    International journal of earth sciences 88 (2000), S. 764-777 
    Details
    ISSN: 1437-3262
    Schlagwort(e): Key words Neoproterozoic ; Dokhan volcanics ; Egypt ; Geochemistry ; Petrogenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie
    Notizen: Abstract  The Neoproterozoic Dokhan volcanics of the Fatira area in eastern Egypt comprise two main rock suites: (a) an intermediate volcanic suite, consisting of basaltic andesite, andesite, dacite, and their associated pyroclastic rocks; and (b) a felsic volcanic suite composed of rhyolite and rhyolitic tuffs. The two suites display well-defined major and trace element trends and a continuum in composition with wide ranges in SiO2 (54–76%), CaO (8.19–0.14%), MgO (6.96–0.04%), Sr (983–7 ppm), Zr (328–95 ppm), Cr (297–1 ppm), and Ni (72–1 ppm). They are enriched in LILEs (Rb, Ba, K, Th, Ce) relative to high field strength elements (Nb, Zr, P, Ti) and show strong affinity to calc-alkaline subduction-related rocks. However, their undeformed character, their emplacement temporally and spatially with post-orogenic A-type granite, and their high Zr/Y values suggest that their emplacement follow the cessation of subduction in eastern Egypt in an extensional-related within-plate setting. Major and trace element variations in the intermediate volcanics are consistent with their formation via partial melting of an enriched subcontinental lithospheric mantle source followed by a limited low-pressure fractional crystallization of olivine and pyroxene before emplacement. The LILE enrichment relative to HFSE is attributed to the inheritance of a subduction component from mantle material which constituted the mantle wedge during previous subduction events in eastern Egypt. The evolution of the whole volcanic spectrum was governed mainly by crystal/melt fractionation of amphibole, plagioclase, titanomagnetite, and apatite in the intermediate varieties and plagioclase, amphibole, biotite, Fe–Ti oxides, apatite, and zircon in the felsic varieties. At each stage of evolution, crystal fractionation was accompanied by variable degrees of crustal contamination.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s005310050304
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