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  • 1
    Series available for loan
    Series available for loan
    Thirty years of applied hydrocarbons research in the Federal Institute for geosciences and Natural Resources (1997)
    Stuttgart : Schweizerbart
    Associated volumes
    Details Availability
    Call number: S 99.0053(103)
    In: Geologisches Jahrbuch
    Type of Medium: Series available for loan
    Pages: 157 S.
    Series Statement: Geologisches Jahrbuch : Reihe D H. 103
    Classification:
    Geochemistry
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    The magnetic universe : geophysical and astrophysical dynamo theory (2004)
    Weinheim : Wiley-VCH
    Details Availability
    Call number: 5/M 04.0436
    Description / Table of Contents: Magnetism is one of the most pervasive features of the Universe, with planets, stars and entire galaxies all having associated magnetic fields. All of these fields are generated by the motion of electrically conducting fluids, the so-called dynamo effect. The precise details of what drives the motion, and indeed what the fluid consists of, differ widely though. In this work the authors draw upon their expertise in geophysical and astrophysical MHD to explore some of these phenomena, and describe the similarities and differences between different magnetized objects. They also explain why magnetic fields are crucial in the formation of the stars, and discuss promising experiments currently being designed to study some of the relevant physics in the laboratory. This interdisciplinary approach makes the book appealing to a wide audience in physics, astrophysics and geophysics.
    Type of Medium: Monograph available for loan
    Pages: IX, 332 S. , Ill., graph. Darst.
    ISBN: 3527404090
    Classification:
    Astronomy and Astrophysics
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Grundlagen der organischen Geochemie (1985)
    Berlin [u.a.] : Springer
    Details Availability
    Call number: AWI G6-92-0172
    Type of Medium: Monograph available for loan
    Pages: VII, 190 S. : 35 Abb. ; 23 cm
    ISBN: 3540159592
    Branch Library: AWI Library
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  • 4
    Electronic Resource
    Electronic Resource
    Deducing planning variables from experimental arm trajectories: Pitfalls and possibilities (1987)
    Springer
    Biological cybernetics 56 (1987), S. 279-292 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract This paper investigates whether endpoint Cartesian variables or joint variables better describe the planning of human arm movements. For each of the two sets of planning variables, a coordination strategy of linear interpolation is chosen to generate possible trajectories, which are to be compared against experimental trajectories for best match. Joint interpolation generates curved endpoint trajectories calledN-leaved roses. Endpoint Cartesian interpolation generates curved joint trajectories, which however can be qualitatively characterized by joint reversal points. Though these two sets of planning variables ordinarily lead to distinct predictions under linear interpolation, three situations are pointed out where the two strategies may be confused. One is a straight line through the shoulder, where the joint trajectories are also straight. Another is any trajectory approaching the outer boundary of reach, where the joint rate ratio always appears to be approaching a constant. A third is a generalization to staggered joint interpolation, where endpoint trajectories virtually identical to straight lines can sometimes be produced. In examining two different sets of experiments, it is proposed that staggered joint interpolation is the underlying planning strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319509
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamic interactions between limb segments during planar arm movement (1982)
    Springer
    Biological cybernetics 44 (1982), S. 67-77 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Movement of multiple segment limbs requires generation of appropriate joint torques which include terms arising from dynamic interactions among the moving segments as well as from such external forces as gravity. The interaction torques, arising from inertial, centripetal, and Coriolis forces, are not present for single joint movements. The significance of the individual interaction forces during reaching movements in a horizontal plane involving only the shoulder and elbow joints has been assessed for different movement paths and movement speeds. Trajectory formation strategies which simplify the dynamics computation are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353957
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  • 6
    Electronic Resource
    Electronic Resource
    An oscillation theory of handwriting (1981)
    Springer
    Biological cybernetics 39 (1981), S. 139-156 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Handwriting production is viewed as a constrained modulation of an underlying oscillatory process. Coupled oscillations in horizontal and vertical directions produce letter forms, and when superimposed on a rightward constant velocity horizontal sweep result in spatially separated letters. Modulation of the vertical oscillation is responsible for control of letter height. Modulation of the horizontal oscillation is responsible for control of corner shape through altering phase or amplitude. The vertical velocity zero crossing in the velocity space diagram is important from the standpoint of control. Changing the horizontal velocity value at this zero crossing controls corner shape. Changing the slope at this zero crossing controls writing slant. The corner shape and slant constraints completely determine the amplitude and phase relations between the two oscillations. This theory applies generally to a number of acceleration oscillation patterns such as sinusoidal rectangular and trapezoidal oscillations. The oscillation theory also provides an explanation for how handwriting might degenerate with speed. An implementation of the theory in the context of the spring muscle model is developed. Here sinusoidal oscillations arise from a purely mechanical source; orthogonal antagonistic spring pairs generate particular cycloids depending on the initial conditions. Modulating between cycloids can be achieved by changing the spring zero settings at the appropriate times. Frequency can be modulated either by shifting between coactivation and alternating activation of the antagonistic springs or by presuming variable spring constant springs. An acceleration and position measuring apparatus was developed for measurements of human handwriting. Measurements of human writing are consistent with the oscillation theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336740
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  • 7
    Electronic Resource
    Electronic Resource
    Imposing a magnetic field across a nonaxisymmetric shear layer in a rotating spherical shell (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 2540-2544 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the context of the generation of the Earth's magnetic field, nonaxisymmetric solutions of the forced momentum equation in a rotating spherical shell are considered in the inertia-less, inviscid limit. It has previously been pointed out that, in general, such solutions are singular, with all three flow components discontinuous across the cylinder tangent to the inner core and parallel to the axis of rotation. An integral constraint on the forcing was derived, which must be satisfied if the inviscid solution is to be nonsingular, and it was suggested that in the presence of a magnetic field the Lorentz force would adjust to satisfy this constraint, thereby eliminating the need for the viscous shear layer, which otherwise resolves the singularity. In this work an axisymmetric field is imposed across this shear layer, and it is demonstrated that for a sufficiently strong field this adjustment does indeed occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868142
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  • 8
    Electronic Resource
    Electronic Resource
    A geodynamo model incorporating a finitely conducting inner core
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 75 (1993), S. 317-327 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(93)90007-V
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  • 9
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    Power in Families, Communication, and Fertility Decision-Making (1980)
    New York : Periodicals Archive Online (PAO)
    Population and environment. 3:2 (1980:Summer) 146 
    Details
    ISSN: 0199-0039
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Sociology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:q535-1980-003-02-000004
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of Aliasing Errors on Microlithographic Image Computations (1997)
    Springer
    Journal of scientific computing 12 (1997), S. 3-10 
    Details
    ISSN: 1573-7691
    Keywords: Aliasing ; microlithography ; aerial image
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Recent advances in computational microelectronics have made it possible to compute the images of very large masks. Images of entire masks require many gigabytes of storage. It is therefore desirable to make storage requirements as small as possible. In this paper, we investigate the effects of reducing resolution to the point where some aliasing error enters the final answer. Due to the accuracy requirements of the microelectronics industry, we conclude that reducing resolution to improve storage requirements is not feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1025685102440
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