ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Monograph available for loan
    Monograph available for loan
    The art of being a scientist : a guide for graduate students and their mentors (2009)
    Cambridge [u.a.] : Cambridge Univ. Press
    Details Availability
    Call number: AWI S6-14-0059 ; 2/N 14.0263
    Description / Table of Contents: "This is a hands-on guide for graduate students and other young researchers wishing to perfect the practical skills that are needed for a successful career in research. By teaching junior scientists to develop effective research habits, the book helps make the experience of graduate study a more efficient, effective and rewarding one. Many graduate students learn these skills "on the job", often by doing them poorly at first, with the result that much valuable time can be lost; this book will help prevent that. The authors have taught a graduate course on the topics covered in this book for many years, and provide a sample curriculum for instructors in graduate schools who wish to teach a similar course. ... The wealth of advice offered in this book is invaluable to students, junior researchers and their mentors in all fields of science, engineering and the humanities."
    Type of Medium: Monograph available for loan
    Pages: X, 286 S. : Ill., graph. Darst.
    Edition: 1. publ. 2009, 5th print. 2013
    ISBN: 9780521743525
    Classification:
    E.7.
    Language: English
    Note: Contents: 1 Introduction. - 2 What is science?. - 3 Choices, choices, choices. - 4 The adviser and thesis committee. - 5 Questions drive research. - 6 Giving direction to our work. - 7 Turning challenges into opportunities. - 8 Ethics of research. - 9 Using the scientific literature. - 10 Communication. - 11 Publishing a paper. - 12 Time management. - 13 Writing proposals. - 14 The scientific career. - 15 Applying for a job. - 16 Concluding remarks. - Appendix A. Futher reading. - Appendix B. A sample curriculum. - Appendix C. The Refer and BibTeX format. - References. - About the authors. - Index.
    Location: AWI Reading room
    Location: Reading room
    Branch Library: AWI Library
    Branch Library: GFZ Library
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    BOOK
    Link to Library Catalog
    get availability status
  • 2
    Electronic Resource
    Electronic Resource
    Determinism Chaos tamed (2007)
    [s.l.] : Nature Publishing Group
    Nature 447 (2007), S. 643-643 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ...In the nineteenth century, the world of physics was one of order. Pierre-Simon Laplace was a key proponent of the deterministic Universe. In this model, the future is completely predictable if one knows the forces between all particles as well as their positions and velocities at any one moment. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/447643a
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    What is a wave? (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 401 (1999), S. 739-740 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ask your colleagues and students to define a wave, and you may be surprised at the answers you get. Even wave professionals are prone to confusion and vagueness when confronted with such an apparently simple question. Students often begin circularly: “a wave is a solution to the wave ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/44453
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The tube worm turns (2000)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 406 (2000), S. 939-939 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ...The past millennium has seen a dramatic change in the way scientists operate. During the Renaissance, scientists often had extremely broad interests. Leonardo da Vinci made great progress as a scientist and engineer, but he also was a painter, sculptor and architect. His interest in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35023062
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Shear-wave velocity structure beneath Europe, the northeastern Atlantic and western Asia from waveform inversions including surface-wave mode coupling (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 127 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Waveforms of 449 seismograms have been inverted for S-wave velocity structures beneath Europe, the northeastern Atlantic, and western Asia down to a depth of 670 km. Recorded waveforms were used in the time window starting at the S-wave arrival and ending after the fundamental-mode Rayleigh-wave arrival. The inversion method is based on the partitioned waveform inversion (Nolet 1990), with the difference that synthetic seismograms are calculated taking surface-wave mode coupling into account in order to model body waves in laterally heterogeneous media more accurately. The partitioning of the inversion procedure makes non-linear optimization feasible, even for inversions including surface-wave mode coupling. The non-linear inversion of the waveforms resulted in linear constraints on the 3-D velocity structure. In a second step, these constraints were used in a linear inversion for the 3-D shear-wave velocity model beneath Europe, the northeastern Atlantic and western Asia. The EUR-SC'95 model is presented, which is characterized by a wide range of length-scales of the velocity structures. In central Europe, where the ray density is highest, small-scale structures are recovered, such as the presence of high velocities associated with the Hellenic subduction zone. On the edges of the inversion model, where the ray density (and therefore also the resolution) is poorer, we find larger-scale features, such as the relatively laterally homogeneous high-velocity structure beneath the Russian Platform to a depth of 300 km. In this paper we discuss the inversion method, data processing, parametrization difficulties due to the introduction of surface-wave mode coupling, spatial resolution of the model, and structures in the EUR-SC'95 model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb04720.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Small-scale sublithospheric continental mantle deformation: constraints from SKS splitting observations (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 123 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: It is generally believed that azimuthal seismic anisotropy is an important property of the subcontinental mantle, and that this is a relatively small-scale phenomenon compared with anisotropy of the oceanic mantle. During recent years, shear-wave splitting has come to be viewed as the most direct diagnostic of azimuthal anisotropy. The magnitude of the splitting delay times can often rule out a crustal source of anisotropy; however, it is not yet clear whether the source of anisotropy lies within the lithosphere or the sublithosphere. It is essential to know the scale of lateral variations and the distribution of anisotropy with depth in order to understand the origin of this phenomenon. Here we describe a way to constrain the depth of the anisotropy, by studying the lateral variation of the splitting parameters at neighbouring seismic stations. We use SKS and SKKS phases recorded at the NARS-NL array, a relatively dense network of broad-band stations separated by about 50 km. Fresnel zones at different depths are calculated for these phases. The depth of the anisotropy is constrained by the criterion that Fresnel zones corresponding to different splitting observations should not overlap. Variability in the splitting measurements for events with different directions of approach recorded at one station, and for single events recorded at various stations, provides evidence for a non-homogeneously distributed source of anisotropy, located below the array at different depths. We show that this variability in the measurements cannot be due to effects of crustal scattering. Our results indicate that the anisotropy is partly located in the sublithospheric mantle at about 400 km depth. This suggests that the deformation in this region is subject to significant lateral variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb06864.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A unified approach to ray bending, ray perturbation and paraxial ray theories (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 115 (1993), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: In the past, perturbation theory has been formulated for the case that either a slowness model was perturbed and the effect of this perturbation on rays was determined, or for the case where the slowness was fixed and where estimates of the ray position were deformed towards the true ray. In this paper both problems are combined in a single perturbation theory. The theory also accommodates arbitrary perturbations to the endpoints of rays and leads to a simple linear differential equation for the ray perturbation. Expressions are derived for the second-order perturbation of the traveltime. This quantity describes the effect of the ray perturbation on the traveltime and of the bias in the traveltime due to the fact that the reference curve need not be a true ray. The second-order traveltime perturbation can be evaluated efficiently by a single integration along the reference curve. In contrast to formalisms using ray-centred coordinates, endpoints perturbations in an arbitrary direction are allowed. This is of importance in tomographic inversions which incorporate earthquake relocations. The cross-term between the slowness perturbations and the source relocations is derived explicitly. The fact that the reference curve does not need to be a true ray in the reference medium allows for an iterative application of ray perturbation theory. The use of the second-order traveltime perturbation allows one to correct for the bias in the traveltime due to the fact that the reference curve is not a ray. A proof is given that the equation for the ray perturbation is consistent with earlier results derived in ray-centred coordinates and the relation with the ray bending theory of Julian & Gubbins (1977) is established. For a fixed-slowness model and for fixed-ray endpoints the two theories are equivalent except at isolated points, this is illustrated with an analogy from classical mechanics. This difference, which results in superior numerical properties for the new algorithm, is illustrated by several numerical examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb01199.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Resolving a low-velocity zone with surface-wave data (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 118 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The main purpose of seismic inversion is the retrieval of seismic velocities and densities in the earth. Inversion of body-wave traveltimes cannot uniquely determine the seismic velocities as a function of depth when a low-velocity layer is present. It is generally assumed that surface waves do not suffer from the same non-uniqueness. The issue is addressed whether it is possible to remove the non-uniqueness of traveltime inversions with a realistic set of surface-wave data. This requires the exact determination of the velocity distribution within and around the low-velocity zone. Waveforms, phase velocities as well as group velocities are investigated qualitatively. Synthetic Love-wave phase and group velocities are actually inverted. Waveforms are shown to be sensitive to the exact velocity distribution of a low-velocity layer, but it is concluded that the removal of the non-uniqueness with the use of waveforms is difficult because the differences of the waveforms are generally small and because complications such as lateral heterogeneity and poorly known source parameters reduce the accuracy of waveform inversions. The inversions of Love phase and group velocities indicate that it is difficult to determine the velocity distribution of a low-velocity layer in a statistically significant way with a realistic set of dispersion data. Group velocities are shown to be more sensitive to the low-velocity structure than phase velocities. Unfortunately, group-velocity data suffers from a practical non-uniqueness because in general only fundamental-mode group velocities can be measured. It is concluded that the non-uniqueness in the detailed structure caused by a low-velocity layer cannot readily be resolved by using surface-wave dispersion data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03965.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Surface-wave mode coupling for efficient forward modelling and inversion of body-wave phases (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 120 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The importance of surface-wave mode coupling in the modelling of body-wave phases by surface-wave mode summation is studied by means of sensitivity kernels obtained with the Born approximation and exact solutions of the Invariant Imbedding Technique. It is shown that, independent of the character of the lateral heterogeneity, surface-wave mode coupling is required to model body-wave phase perturbations and that neglecting intermode coupling, as in the WKBJ method for surface waves, can lead to large biases. Because methods which describe surfacewave mode coupling in an exact fashion are computationally too expensive to use in inversion schemes, the Scalar Exponent Approximation (SEA) is presented, which is a computationally efficient method and takes mode coupling into account. Since, instead of Earth normal modes, surface-wave modes are used, the summation over the angular order l is carried out analytically. This means that the number of modes and mode interactions needed is significantly reduced which assures an efficient manner of modelling. It is shown that the SEA is accurate in modelling body-wave phase perturbations for geophysically realistic configurations. Because, in contrast to the WKBJ sensitivity kernels, mode coupling introduces sensitivity kernels which also depend on the position along the source-receiver path, the SEA requires a larger model parameter set in inversions. A procedure is presented which reorganizes the model parameter set and leads to a reduced set of physically relevant model parameters. The combination of the SEA and the reorganization of the model parameters can be used efficiently in large-scale 3-D inversions which incorporate the important effects of surface-wave mode coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb05920.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Estimation of finite-frequency waveforms through wavelength-dependent averaging of velocity (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 126 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The wavelength-smoothing (WS) method was introduced recently (Lomax 1994) as a method for the rapid estimation of the principal features of broad-band wave phenomena in realistic., complicated structures. The WS method is based on the concept that waves at a particular frequency and corresponding wavelength respond to a complicated velocity distribution as if the distribution were smoothed over about a wavelength. This method reproduces several finite-frequency wave phenomena, but has not been given a formal theoretical justification. Here, we use scattering theory and a local, plane-wave approximation to develop a wavelength-averaging (WA) method for modelling finite-frequency wave propagation. The new WA method is similar to the WS method in concept and implementation, but is valid only in a more limited geometry of velocity heterogeneity. In particular, the new formulation performs well for models with complex, but smoothly varying, velocity variations (‘quasi-random’ models), but does less well in models with extensive regions of slowly varying velocity that are separated by strong gradients in velocity (‘deterministic’ models). This limits application of the current formulation of the WA method to predominantly quasi-random structures, although such models may be useful in many problems, particularly for Monte-Carlo-based inversion methods requiring fast forward calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb05297.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...