Comparison of Dimensionless Parameters in Astrophysical MHD Systems and in Laboratory Experiments     

E. P. Kurbatov  D. V. Bisikalo  M. V. Starodubtsev  A. Ciardi  J. Fuchs  A. A. Solov’ev  K. F. Burdonov  G. Revet  S. Chen 《Astronomy Reports》2018,62(8):483-491

Estimates of typical parameters of accretion flows in the representative intermediate polar EX Hydrae, the polar AM Herculis, and the “hot Jupiter” WASP-12b are presented. Dimensionless parameters of astrophysical systems are compared with those of laboratory experiments on laser ablation in magnetic fields. It is shown that laboratory simulations of astrophysical flows is possible in principle, provided that some adjustment to the magnetic field, plasma density, and plasma velocity are made.  相似文献   

Book review     

Karl Fuchs 《Rock Mechanics and Rock Engineering》1974,6(3):188-188

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Spiral density waves illustrated by the superposition of periodic stellar orbits     

R. Frahm  B. Fuchs  K. O. Thielheim 《Astrophysics and Space Science》1979,63(1):185-191

Plane, periodic stellar orbits in the spiral gravitational field of the Galaxy superimposed on the axisymmetric background potential are studied in the epicyclic approximation. The superposition of such orbits is illustrated to demonstrate the response of the stellar system to an imposed spiral density perturbation.  相似文献   

A new constraint on the composition of the topmost continental mantle—anomalously different depth increases of P and S velocity     

D. Gajewski  R. Stangl  K. Fuchs  K. J. Sandmeier 《Geophysical Journal International》1990,103(2):497-507

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Deep 3D thermal modelling for the city of Berlin (Germany)   总被引：1，自引：1，他引：0  

Judith Sippel  Sven Fuchs  Mauro Cacace  Anna Braatz  Oliver Kastner  Ernst Huenges  Magdalena Scheck-Wenderoth 《Environmental Earth Sciences》2013,70(8):3545-3566

This study predicts the subsurface temperature distribution of Germany’s capital Berlin. For this purpose, a data-based lithosphere-scale 3D structural model is developed incorporating 21 individual geological units. This model shows a horizontal grid resolution of (500 × 500) m and provides the geometric base for two different approaches of 3D thermal simulations: (1) calculations of the steady-state purely conductive thermal field and (2) simulations of coupled fluid flow and heat transport. The results point out fundamentally different structural and thermal configurations for potential geothermal target units. The top of the Triassic Middle Buntsandstein strongly varies in depth (159–2,470 m below sea level) and predicted temperatures (15–95 °C), mostly because of the complex geometry of the underlying Permian Zechstein salt. The top of the sub-salt Sedimentary Rotliegend is rather flat (2,890–3,785 m below sea level) and reveals temperatures of 85–139 °C. The predicted 70 °C-isotherm is located at depths of about 1,500–2,200 m, cutting the Middle Buntsandstein over large parts of Berlin. The 110 °C-isotherm at 2,900–3,700 m depth widely crosscuts the Sedimentary Rotliegend. Groundwater flow results in subsurface cooling the extent of which is strongly controlled by the geometry and the distribution of the Tertiary Rupelian Clay. The cooling effect is strongest where this clay-rich aquitard is thinnest or missing, thus facilitating deep-reaching forced convective flow. The differences between the purely conductive and coupled models highlight the need for investigations of the complex interrelation of flow- and thermal fields to properly predict temperatures in sedimentary systems.  相似文献   

A modeling language to support the interoperability of global navigation satellite systems     

Daniele Gianni  Joachim Fuchs  Pierluigi De Simone  Marco Lisi 《GPS Solutions》2013,17(2):175-198

The availability of multiple Global Navigation Satellite Systems (GNSS) will offer the opportunity to provide seamless navigation services and improved positioning performance. However, before this opportunity can be exploited, a number of issues need to be solved to ensure the compatibility and interoperability of existing GNSS. In particular, the GNSS interoperability can be technically defined as the capability of receivers to compute their global position using two or more GNSS signals. This capability can be more effectively achieved if Signal-In-Space interface specifications are available in a consistent, unambiguous, and possibly standard format, which can support engineers to design interoperable receivers. We aim to support the design of interoperable receivers with the introduction of the Interface Communication Modeling Language (ICML), a graphical language for the formal specification of Signal-In-Space interfaces. The ICML language enables receiver engineers to specify these interfaces at different levels of abstraction, such as analog signal or binary data. In addition, the ICML language also supports the specification of conversion routines between adjacent levels, for the representation of the dynamic aspects—e.g., convolution and encryption processes—of the interface specification. As such, the ICML language proposes an alternative format to textual-based interface specifications and can possibly integrate with the ongoing trend of the Model-based Systems Engineering approaches. We present the structure of the framework implementing the language and an example ICML-based specification for a simplified and reduced version of the Galileo Freely Accessible Navigation (F/NAV) message. The language metamodel is also attached for technical reference. An important caveat: no endorsement is made for the use of the ICML language for the official Galileo Signal-In-Space interface specification.  相似文献   

An Integrated Approach to Germanic Place Names in the American Midwest     

Stephan Fuchs 《The Professional geographer》2013,65(3):330-341

Place names represent an established topic in sociocultural and critical scholarship on human space and place. Based on a comprehensive data set of Germanic names in the American Midwest, this article explores the value of a novel approach integrating advanced spatio-statistical measures with critical interpretation to revitalize the field of toponomy on a concerted methodological and theoretical level. Processed in a geographic information system (GIS) environment, the regional toponymic pattern provides a broad and reliable framework that evokes interpretative discussion of underlying structures and processes. This characterizes Germanic toponyms as versatile sociodemographic, political, and ethnocultural indicators.  相似文献   

The copper-silver occurrences of Rahmani,Western Sahara,Algeria     

Y. Fuchs  F. Arbey  T. Bouima 《Mineralium Deposita》1996,31(4):340-342

The copper-silver occurrences of Rahmani (Western Sahara, Algeria) are located in paleochannel facies of Cambrian sandstones deposited onPan-African volcanics and intrusives. Sulfur isotope analyses were performed on pyrite and copper sulfides in order to trace the origin of the copper-silver mineralization. S isotopic data preclude that bacterial reduction of Cambrian sulfate could have induced the formation of the sulfides. Non-bacterial reduction of sulfate during burial diagenesis is the most valuable explanation for disseminated pyrite. Isotopic ratios on copper sulfides indicate that they result from the reaction of actual or subactual sulfate-bearing surface water with the disseminated pyrite. The origin of copper and silver remains unclear. They are thought to be brought by the downward migrating surface water but their origin could be either the leaching of the Cambrian sandstones or of the weathered volcanics.  相似文献   

Characterization of tourmalines by FTIR absorption spectrometry     

J. -L. Robert  Y. Fuchs  J. -P. Gourdant 《Physics and Chemistry of Minerals》1996,23(4-5):309-309

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Wave propagation in a multiple-scattering upper mantle—observations and modelling     

M. Tittgemeyer  F. Wenzel  K. Fuchs  T. Ryberg 《Geophysical Journal International》1996,127(2):492-502

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