Possible impact of climate change on the occurrence and the epidemic development of cercospora leaf spot disease (Cercospora beticola sacc.) in sugar beets for Rhineland-Palatinate and the southern part of Hesse     

Pascal Kremer  Jan Schlüter  Paolo Racca  Hans-Joachim Fuchs  Christian Lang 《Climatic change》2016,135(3-4):481-491

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Alpine metamorphic evolution and cooling history of the Veporic basement in northern Hungary: new petrological and geochronological constraints     

Balázs Koroknai  Péter Horváth  Kadosa Balogh  István Dunkl 《International Journal of Earth Sciences》2001,90(3):740-751

Petrological and geochronological investigations were carried out on metamorphic rocks of the Veporic unit (Inner Western Carpathians) in northern Hungary. K/Ar and Ar/Ar data on micas and amphibole show only Alpine ages (mostly in the range of 87-95 Ma) in this basement unit. Thermobarometric calculations yield lower amphibolite facies peak conditions (ca. 550냴 °C and 9ǃ kbar) for the Eoalpine metamorphic event. Complex evolution of gneissic rocks is reflected by the presence of discontinuously zoned garnets, the cores of which may represent relics of a pre-Alpine (presumably Variscan) thermal event. Zircon fission track (FT) data in the narrow range of 75-77.5 Ma indicate that this portion of the Veporic unit was emplaced to shallow crustal levels already during the Senonian time. The relative minor difference between zircon FT and K/Ar or Ar/Ar ages suggests very rapid cooling during the Late Cretaceous, most probably related to the extensional unroofing of the Veporic core complex. The obtained cooling ages do not support previous models of Tertiary uplift and exhumation of the Veporic unit along the Hurbanovo-Diósjeni Line.  相似文献   

Aspects Of Ring Lasers As Local Earth Rotation Sensors     

U. Schreiber  M. Schneider  C.H. Rowe  G.E. Stedman  W. Schlüter 《Surveys in Geophysics》2001,22(5-6):603-611

Ring laser rotation sensors are best known from inertial navigation, wherethey have many advantages over mechanical gyroscopes. They have recentlybeen greatly improved, and show potential as fully independent length-of-daysensors. We discuss some important aspects of current limitations in theirperformance. In particular we demonstrate a novel scheme for thestabilisation of a large ring laser against frequency pulling effectsinduced by backscatter.  相似文献   

Environmental policy and regulation for oil exploration and shipping activities in the Barents Sea     

Gunnar Futs  ter 《Marine pollution bulletin》1994,29(6-12):348-353

The Barents Sea has one of the highest levels of biological production of all the world's oceans, and holds some of the largest fish stocks and concentrations of seabirds. Environmental conditions in the area make it particularly vulnerable to damage from human activities. Given the vulnerability of this ecosystem to the effects of human activity, and the fact that physical factors (e.g. reduced visibility, ice) increase risks due to oil exploitation and shipping activities, environmental authorities will work towards more stringent discharge limits and higher standards for emergency preparedness for both oil exploitation and shipping in the Barents Sea. The Norwegian Pollution Control Authority gives priority to preventive measures that can lower the probability of accidents and particular emphasis will be given to conditions attached to production licences and controls on activities in areas that have not yet been opened for petroleum activities. Within the Arctic Environmental Protection Strategy (the Rovaniemi-process), Norway has proposed that efforts should be made to improve the protection of Arctic marine areas, and further that a working group including representatives of all the Arctic countries should assess various legal instruments and possible measures, and make recommendations for action. Currently, no special international requirements apply to ships sailing in ice-infested waters, and the recommendations from the working group will therefore be of great importance in protecting the area from damage from shipping.  相似文献   

Mesozoic palaeomagnetism of the transdanubian central mountains and its tectonic implications     

Em Mrton  Pter Mrton 《Tectonophysics》1981,72(1-2)

The Mesozoic apparent polar wandering (APW) of the Transdanubian Central Mountains, determined from thermally isolated natural remanences at 13 localities, shows a remarkable similarity to the Mesozoic APW of Africa in that they both exhibit the same loop-like movement. Moreover, the difference between the two APW's can practically be eliminated by a 35° clockwise rotation of the palaeodeclinations. It is concluded, therefore, that the region of the Transdanubian Central Mountains was part of the African (-Adriatic) plate up to some time in the Cenozoic when it moved to its present position, resulting in a 35° anticlockwise rotation relative to Africa.  相似文献   

Trace element partitioning during high-P partial melting and melt-rock interaction; an example from northern Fiordland, New Zealand   总被引：2，自引：0，他引：2  

F. C. Schröter  J. A. Stevenson  N. R. Daczko  G. L. Clarke  N. J. Pearson  K. A. Klepeis 《Journal of Metamorphic Geology》2004,22(5):443-457

Pods of granulite facies dioritic gneiss in the Pembroke Valley, Milford Sound, New Zealand, preserve peritectic garnet surrounded by trondhjemitic leucosome and vein networks, that are evidence of high‐P partial melting. Garnet‐bearing trondhjemitic veins extend into host gabbroic gneiss, where they are spatially linked with the recrystallization of comparatively low‐P two‐pyroxene‐hornblende granulite to fine‐grained high‐P garnet granulite assemblages in garnet reaction zones. New data acquired using a Laser Ablation Inductively Coupled Plasma Mass Spectrometer (LA‐ICPMS) for minerals in various textural settings indicate differences in the partitioning of trace elements in the transition of the two rock types to garnet granulite, mostly due to the presence or absence of clinozoisite. Garnet in the garnet reaction zone (gabbroic gneiss) has a distinct trace element pattern, inherited from reactant gabbroic gneiss hornblende. Peritectic garnet in the dioritic gneiss and garnet in trondhjemitic veins from the Pembroke Granulite have trace element patterns inherited from the melt‐producing reaction in the dioritic gneiss. The distinct trace element patterns of garnet link the trondhjemitic veins geochemically to sites of partial melting in the dioritic gneiss.  相似文献   

Using sea-level data to constrain a finite-element primitive-equation ocean model with a local SEIK filter     

Lars Nerger  Sergey Danilov  Wolfgang Hiller  Jens Schröter 《Ocean Dynamics》2006,56(5-6):634-649

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The influence of a stratified rheology on the flexural response of the lithosphere to (un)loading by extensional faulting   总被引：2，自引：0，他引：2  

M. ter Voorde  R. T. van Balen  G. Bertotti  & S. A. P. L. Cloetingh 《Geophysical Journal International》1998,134(3):721-735

We present a two-layered finite difference model for the flexural response of the lithosphere to extensional faulting. The model allows for three modes of flexure: (1) fully coupled, with the upper crust and mantle welded together by the lower crust; (2) fully decoupled, with the upper crust and mantle behaving as independent layers; and (3) partly decoupled, signifying that the response of the upper crust to small-wavelength loads is superimposed on the response of the entire lithosphere to long-wavelength loads. Which of these modes of flexure is to be expected depends on the rheology and especially the thermal state of the lithosphere. Coupled behaviour is related to a cold and strong lithosphere. The Baikal Rift Zone provides a typical example for this mode of flexure. A fully decoupled lithosphere is an exceptional case, related to anomalous high temperatures in the lower crust, and is observed in the Basin and Range province. The most common case is a partly decoupled lithosphere, with the degree of decoupling depending on the thickness and viscosity of the lower crust. This is inferred, for example, for the Bay of Biscay margin.  相似文献   

Zur Aquatoxizität ausgewählter Harnstoffherbizide und zu ihrer Kategorisierung als Wasserschadstoffe     

M. Tscheu-Schlüter  W. Winter 《洁净——土壤、空气、水》1985,13(4):489-497

Eight urea herbicides, as are used for weed control, are investigated for their effect on the green alga Ankistrodesmus falcatus and the warm-water fish Poecilia reticulata and found to be highly toxic for the test alga or highly to moderately toxic for the fish. If other criteria (acute toxicity to warm-blooded animals, carcinogenicity and biochemical degradability) are taken into account too, the tested herbicides have to be classified as very dangerous water pollutants. Legal sanctions to be applied in cases of exceeded limiting values are discussed.  相似文献   

People of German descent in CIS States — areas of settlement,territorial autonomy and emigration     

Helmut Klüter 《GeoJournal》1993,31(4):419-434

Until 1989 the ethnic Germans tended to live in Kazakhstan, Central Asia and South-West Siberia. Not only German but also Russian and Ukrainian residents in Kazakhstan and Central Asia have been induced to leave. In South-West Siberia attempts are beeing made to keep the ethnic Germans there. Two autonomous German districts have been established. The mass scale emigration to Germany has, however, affected these areas, too. That means that not only push factors are effective but also pull factors play a role. They concern the privileged immigrant status of Aussiedler in Germany. The economic damage suffered by Siberia on account of this kind of undifferentiated drain of workers and specialists puts whole economic regions in jeopardy. The German Home Office tried to support the re-establishment of the German Volga Republic which was dissolved by Stalin in 1941. Some German unprofessionally organised economic projects and severe diplomatic mistakes actually strengthened the nationalistic Russian opposition so that the reestablishment failed. An improvement of the ethnic Germans' perspectives in the CIS is only possible if Germany makes use of the tried and tested instruments of development aid and regional planning. German consulates and trade agencies should be opened in the Volga region, and in Siberia. It is necessary to establish a Siberian-German bank and Russian-German universities. A special programme should provide support for well-qualified people whose knowledge and skills are vital for a continuation of the ethnic Germans' economy and culture.  相似文献