Computing the elastic scattering from inclusions using the multiple multipoles method in three dimensions     

Matthias G. Imhof 《Geophysical Journal International》2004,156(2):287-296

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Über den Einfluß fluktuierender Windfelder auf ein stetig geschichtetes Meer     

Matthias Tomczak Jr. 《Ocean Dynamics》1967,20(3):101-129

Zusammenfassung Am geschichteten Meer werden die erzwungenen Schwingungen theoretisch untersucht, die ein an der Oberfl?che angreifender Wind hervorruft. Grunds?tzlich entsteht an der Oberfl?che eine Grenzschicht mit gro?er Horizontalgeschwindigkeit. Für den Fall, da? ihre Ausdehnung klein gegenüber der inneren Region ist, werden die erzwungenen Schwingungen (Abschnitt 2) analytisch berechnet. Interne Wellen oberhalb der Tr?gheitsperiode sind klein und auf sehr kleine Wellenzahlen beschr?nkt. Die physikalische Erl?uterung sowie die Tatsache, da? einige spezielle Windfelder keine internen Wellen anregen k?nnen, bringt Abschnitt 3, die numerische L?sung für beliebige Frequenzen und Wellenzahlen Abschnitt 4. Interne Wellen unterhalb der Tr?gheitsperiode werden haupts?chlich durch die Divergenz des Windfeldes hervorgerufen, solche oberhalb der Tr?gheitsperiode durch die Rotation des Windfeldes, und es ergeben sich unterschiedliche funktionale Zusammenh?nge zwischen Wind und internen Wellen. Die hier vorgelegten Ergebnisse k?nnen nur mit Hilfe einer tangential an der Oberfl?che angreifenden Kraft erhalten werden und weisen wesentliche Unterschiede gegenüber ?hnlichen Ergebnissen auf, die für den Windeinflu? eine Volumenkraft annehmen.

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On the influence of fluctuating winds on a continuously stratified ocean

Summary The model of a stratified ocean is used for a theoretical study of the forced oscillations caused by the wind acting upon the surface. A boundary layer with high horizontal velocity is principally generated at the surface. If it is narrow as compared with the inner region, the forced oscillations (section 2) are computed analytically. Internal waves above the inertia period are small and confined to very small wave numbers. The physical explanation and the fact that special wind fields cannot generate internal waves, are given in section 3; the numerical solution for arbitrary frequences and wave numbers is treated in section 4. Internal waves below the inertia period are mainly caused by the divergence of the wind field; those above the inertia period by the rotation of the wind field; and different functional connections between the wind and the internal waves are the results. The results presented here can be obtained only by means of a force acting tangentially upon the surface. They differ essentially from similar results based upon the assumption of a volume force for the wind effect.

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Influence de champs de vent fluctuants sur une mer contin?ment stratifiée

Résumé On étudie et on calcule analytiquement (paragraphe 2) pour une mer stratifiée, les oscillations provoquées par un vent s'attaquant à la surface. En principe, il se forme à la surface une couche-limite à grande vitesse horizontale. Les ondes internes au-dessus de la période d'inertie sont petites et se limitent à de très petits nombres d'ondes. Le paragraphe 3 donne l'explication physique et signale le fait que quelques champs de vent spéciaux ne peuvent pas provoquer d'ondes internes; le paragraphe 4 apporte une solution numérique pour des fréquences et des caractéristiques numériques d'ondes quelconques. Les ondes internes au-dessous de la période d'inertie sont dues principalement à la divergence du champ de vent, celles au-dessus de la période d'inertie, à la rotation de ce champ; et on trouve des rapports fonctionnels distincts entre le vent et les ondes internes. Les résultats exposés ici ne peuvent être obtenus qu'à l'aide d'une force attaquant tangentiellement la surface, ils diffèrent notablement des résultats correspondants obtenus en admettant que l'influence du vent s'exerce sous forme d'une force non tangentielle.

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Mit der — hier gekürzt — vorliegenden Arbeit promovierte der Verfasser bei der Mathematisch-Naturwissenschaftlichen Fakult?t der Christian-Albrechts-Universit?t Kiel.  相似文献   

Über Eigenwerte freier und Resonanz erzwungener interner Wellen in einem stetig geschichteten flachen Meer     

Matthias Tomczak Jr. 《Ocean Dynamics》1967,20(5):217-232

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Composition of soluble organic matter in coals: relation to rank and liptinite fluorescence     

Matthias Radke  Rainer G. Schaefer  Detlev Leythaeuser  Marlies Teichmüller 《Geochimica et cosmochimica acta》1980,44(11):1787-1800

Study of a series of twenty-six German high volatile bituminous B to low volatile bituminous coals of Upper Carboniferous age by recently refined analytical methods (‘flow-blending’ extraction, medium pressure liquid chromatography, HPLC, glass capillary gas chromatography and spectral fluorescence microscopy) reveals that yield and composition of soluble organic matter are strongly controlled by rank. In particular, the following points of inflection are noted in rank trends around 0.9% vitrinite reflectance: a maximum in yields of total soluble organic matter, aromatic hydrocarbons and n-alkanes; the most pronounced change in aromatic hydrocarbon composition; a trend reversal for pristane/ phytane ratios; a gradient change in the odd/even-predominance of long chain n-alkanes; appearance of a bimodal n-alkane distribution; and a sharp drop in concentration of individual n-, and isoprenoid alkanes. This discontinuity in rank trends around 0.9% Rm is interpreted to reflect a major change in reaction types, i.e. a shift from predominantly hydrocarbon generating to predominantly fragmentation reactions. Rank trends of maceral fluorescence exhibit the following pronounced changes over a similar but broader rank range: Different types of the maceral sporinite show a relatively abrupt shift of the fluorescence colour from yellow towards red between 0.8–0.9% Rm while up to about 1.0% Rm a sharp increase is recorded in the proportion of fluorescent vitrinite. This coincidence at a near-equal rank stage suggests a common cause for changes in yield and composition of the soluble organic matter and the maceral fluorescence of these coals.  相似文献   

Metamorphic reactions between fluid inclusions and mineral hosts. I. Progress of the reaction calcite+quartz=wollastonite+CO2 in natural wollastonite-hosted fluid inclusions     

W. Heinrich  Matthias Gottschalk 《Contributions to Mineralogy and Petrology》1995,122(1-2):51-61

 At the Bufa del Diente contact-metamorphic aureole, brine infiltration through metachert layers embedded in limestones produced thick wollastonite rims, according to Cc+Qz=Wo+CO₂. Fluid inclusions trapped in recrystallized quartz hosts include: (1) high salinity four phase inclusions [Th(V-L)=460–573° C; Td(salts)=350–400° C; (Na+K)_Cleq=64–73 wt%; X _{CO 2}≤0.02]; (2) low density vapour-rich CO₂-bearing inclusions [Th(L-V)≈500±100° C; X _{CO 2}=0.22–0.44; X _NaCl≤0.01], corresponding to densities of 0.27± 0.05 gcm⁻³. Petrographical observations, phase compositions and densities show that the two fluids were simultaneously trapped in the solvus of the H₂O-CO₂-salts system at 500–600° C and 700±200 bars. The low density fluid was generated during brine infiltration at the solvus via the wollastonite producing reaction. Identical fluid types were also trapped as inclusion populations in wollastonite hosts 3 cm adjacent to quartz crystals. At room temperature, both fluid types additionally contain one quartz and one calcite crystal, generated by the back-reaction Wo+CO₂=Cc+Qz of the host with the CO₂-proportion of the fluid during retrogression. All of the CO₂ was removed from the fluid. On heating in the microstage, the reaction progress of the prograde reaction was estimated via volume loss of the calcites. In vapour-rich fluids, 50% progress is reached at 490–530° C; 80% at 520–560° C; and 100% at 540–590° C, the latter representing the trapping temperatures of the original fluid at the two fluid solvus. The progress is volume controlled. With knowledge of compositions and densities from unmodified inclusions in quartz and using the equation of state of Duan et al. (1995) for H₂O-CO₂-NaCl, along with f _{CO 2}-values extracted from it, the reaction progress curve was recalculated in the P-T-X-space. The calculated progress curve passes through the two fluid solvus up to 380° C/210 bars, continues in the one fluid field and meets the solvus again at trapping conditions. The P-T slope is steep, most of the reaction occurs above 450° C and there is high correspondence between calculated and measured reaction progress. We emphasize that with the exception of quartz, back-reactions between inclusion fluids and mineral hosts is a common process. For almost any prograde metamorphic mineral that was formed by a devolatilization reaction and that trapped the equilibrium fluid or any peak metamorphic fluid as an inclusion, a fluid-host back-reaction exists which must occur somewhere along the retrograde path. Such retrograde reactions may cause drastic changes in density and composition of the fluid. In most cases, however, evidence of the evolving mineral assemblages is not given for they might form submicroscopical layers at the inclusion walls. Received: 15 March 1995 / Accepted: 1 June 1995  相似文献   

Book reviews     

A. Zaporozec  L. Gumpert  Hans-Dietrich Birr  Matthias Kuhle 《GeoJournal》1991,23(3):295-296

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On the ice age glaciation of the Tibetan highlands and its transformation into a 3-D model     

Prof. Matthias Kuhle Dr.  Klaus Herterich Dr.  R. Calov 《GeoJournal》1989,19(2):201-206

We present an interdisciplinary study on data and modeling intercomparison, concerning the possible existence of a Tibetan ice sheet and its climatological implications during the ice age. In the ice sheet model the fields of ice flow and temperature are calculated, and a highly parameterized formulation of the yearly snow balance is used, defining the forcing at the surface of the ice sheet. The data set used, supplies the height of the equilibrium line of the glaciers (=ELA) and documents the maximum extension of the glaciated areas. With prescribed snow accumulation above the ELA and melting below, the model is integrated for 10 000 model years and the model glaciation is then compared with the data.The main results are: Provided the height of the glacial equilibrium line has been reconstructed correctly, a Tibetan ice sheet can be bult up within 10 000 model years, using moderate rates of precipitation (maximum snow fall: 100 mm/year). Comparison of data and model glaciation suggests an increase of precipitation from the NW to the E of Tibet and from the S to the NE, which reflects the presently observed pattern of the monsoon circulation.  相似文献   

Erprobung des Dreissena-Monitors,eines neuen Biotestsystems mit der Zebramuschel (Dreissena polymorpha), in der Rhein-Gütemeßstation Karlsruhe Evaluation of the Dreissena-monitor at the River Rhine — a New Biological Monitoring System Based on the Zebra Mussel Dreissena polymorpha     

U. Matthias  Rmpp 《洁净——土壤、空气、水》1994,22(4):161-165

Object of the present study is a new biomonitor using Dreissena polymorpha PALLAS as testorganism. The status of the shell gape and the valve movements are parameters to indicate toxic discharges. With the aid of some toxicity tests using trichloroethylene, chloroform, ethylparathion, and copper(II)sulfate, the detection efficiency of the “Dreissena-monitor” was described and compared with those of biomonitors in literature. The use of the monitors in the control of sewage, drinking water, and natural waters is discussed. The critical concentrations at which an alarm was set by the “Dreissena-monitor” were 0.03 to 0.1 mg/L with copper(II)sulfate, 7.5 to 8.2 mg/L with trichloroethylene, 33 mg/L with chloroform, and 0.8 to 0.9 mg/L ethyl parathion. Thereby, the alarm was always set within 5 to 35 minutes. Possible fields of application are especially the control of sewage effluents and their immediate environments.  相似文献   

New Data on the pleistocene glacial cover of the Southern Border of Tibet: The glaciation of the Kangchendzönga Massif (8585 m E Himalaya)   总被引：1，自引：0，他引：1  

Matthias Kuhle 《GeoJournal》1990,20(4):415-421

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The probability of proof in geomorphology —an example of the application of information theory to a new kind of glacigenetic morphological type,the ice-marginal ramp (Bortensander)     

Matthias Kuhle 《GeoJournal》1990,21(3):195-222

The scientific acceptance of presentations of proof is largely dependent upon the parts of mathematical logic upon which they are based. This explains the trend of introducing quantitative methods into tho disciplines which — due to the historical dimensions of their subjects — have so far followed a qualitative analysis of character coincidences i.e. a typogenetic form of reasoning. But the application of reductionistic quantification such as was followed in the GMK 25 project foundered because of the polymorphic structure of the phenomena. It was this that made geomorphological proof so difficult, since an inductive basis for general lawful relations can only be provided by regionally detailed observations of complexes with developments of their own. The application of information theory however e.g. in relation to the glacigenetic Type ‘Bortensander’ or ice-marginal ramps (IMR) now allows the determination of the probability of the coincidental occurrence of characteristics and a measure of the probability of the causal nexus upon which this is based. By transposing the basis of induction on to an abstract plane a high degree of proof of typogenetic arguments in geomorphology may be provided. The quantification here does not count the elements of the proof directly but is related to the occurrence of those indicators which form the empirically based qualitative units of the inductive key. The author gratefully acknowledges the translation of this paper rendered by Cyril A. Halstead, Glasgow  相似文献