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  • 1
    ISSN: 1434-601X
    Keywords: PACS:25.80.Gn Pion charge-exchange reactions – 13.75.Gx Pion-baryon interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The contribution of the σ meson exchange to the pionic double charge exchange (DCX) reaction is investigated. A concrete calculation on the forward excitation function of the low energy DCX reaction 14C(π+, π−)14O has been performed. It shows that the contribution of the σ meson exchange can reproduce well the resonance like excitation function of low energy DCX reaction.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2016-04-15
    Description: We examine the interannual variability of the seasonal mean atmospheric circulation in the Southern Hemisphere during austral winter. The three major modes are identified by rotated empirical orthogonal function (REOF) analysis. As expected, REOF1 is associated with the Southern Annular Mode which is dominated by internal atmospheric dynamics. REOF2 displays a wave train, linked to the western North Pacific monsoon and the Pacific-Japan pattern in East Asia in the same season; REOF3 resembles the Pacific-South American pattern. Externally forced variability strongly projects on both REOF2 and REOF3 so that in the ensemble mean, an atmospheric model with prescribed observed sea surface temperature captures considerable parts of the time evolution of REOF2 (50%) and REOF3 (25%), suggesting a potential predictability for the two modes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 24-25 (Sept. 2007), p. 239-242 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The grinding process of aluminum alloy is introduced in the paper and carried outexperiment. The material is removed from the workpiece by fixed abrasives and scratching thesurface to be finished in grinding process. In order to increase machining accuracy and efficiency, it isnecessary to analyze the machining parameters of grinding process. The emphasis is the effect ofmachining parameters on roughness of surface and mass loss of workpiece by a set of experiments inthis paper
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 5
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    AGU
    In:  Geophysical Research Letters, 40 . pp. 2278-2283.
    Publication Date: 2017-05-24
    Description: Extraordinarily strong El Niño events, such as those of 1982/83 and 1997/98, have been poorly predicted by operational seasonal forecasts made before boreal spring, despite significant advances in understanding, improved models, and enhanced observational networks. The Equatorial Atlantic Zonal Mode – a phenomenon similar to El Niño but much weaker and peaking in boreal summer – impacts winds over the Pacific, and hence affects El Niño, and also potentially its predictability. Here we use a climate model to perform a suite of seasonal predictions with and without SST in the Atlantic restored to observations. We show for the first time that knowledge of Equatorial Atlantic sea surface temperature (SST) significantly improves the prediction across boreal spring of major El Niño events and also weaker variability. This is because Atlantic SST acts to modulate El Niño variability, rather than triggering events. Our results suggest that better prediction of major El Niño events might be achieved through model improvement in the Equatorial Atlantic.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
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  • 6
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    Copernicus Publications (EGU)
    In:  Geoscientific Model Development, 8 (1). pp. 51-68.
    Publication Date: 2017-12-19
    Description: Large-scale fully coupled Earth system models (ESMs) are usually applied in climate projections like the IPCC (Intergovernmental Panel on Climate Change) reports. In these models internal variability is often within the correct order of magnitude compared with the observed climate, but due to internal variability and arbitrary initial conditions they are not able to reproduce the observed timing of climate events or shifts as for instance observed in the El Niño–Southern Oscillation (ENSO), the Pacific Decadal Oscillation (PDO), or the Atlantic Meridional Overturning Circulation (AMOC). Additional information about the real climate history is necessary to constrain ESMs; not only to emulate the past climate, but also to introduce a potential forecast skill into these models through a proper initialisation. We attempt to do this by extending the fully coupled climate model Max Planck Institute Earth System Model (MPI-ESM) using a partial coupling technique (Modini-MPI-ESM). This method is implemented by adding reanalysis wind-field anomalies to the MPI-ESM's inherent climatological wind field when computing the surface wind stress that is used to drive the ocean and sea ice model. Using anomalies instead of the full wind field reduces potential model drifts, because of different mean climate states of the unconstrained MPI-ESM and the partially coupled Modini-MPI-ESM, that could arise if total observed wind stress was used. We apply two different reanalysis wind products (National Centers for Environmental Prediction, Climate Forecast System Reanalysis (NCEPcsfr) and ERA-Interim reanalysis (ERAI)) and analyse the skill of Modini-MPI-ESM with respect to several observed oceanic, atmospheric, and sea ice indices. We demonstrate that Modini-MPI-ESM has a significant skill over the time period 1980–2013 in reproducing historical climate fluctuations, indicating the potential of the method for initialising seasonal to decadal forecasts. Additionally, our comparison of the results achieved with the two reanalysis wind products NCEPcsfr and ERAI indicates that in general applying NCEPcsfr results in a better reconstruction of climate variability since 1980.
    Type: Article , PeerReviewed
    Format: text
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  • 7
    Publication Date: 2014-06-16
    Description: The variability of the austral summer (DJF) Southern Annular Mode (SAM) between 1960/61 and 2001/02 is investigated on interannual and decadal time scales. Using a set of relaxation experiments, it is found that the tropics excite large parts of the SAM variability. The stratospheric influence on interannual time scales, especially before 1980, appears rather weak suggesting that the strong impact from the stratosphere during DJF found by other studies, is rather excited in austral spring and the persisted into the summer by a too long memory in the models. The stratospheric influence on the long-time trend however is consistent with previous studies, while the influence from the tropical atmosphere on these trends still appears strongest in our model results.
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: slideshow
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  • 8
    Publication Date: 2017-04-13
    Description: Tropical influence on the austral summer Southern Annular Mode (SAM) over the ERA-40 period 1960/1961–2001/2002 is investigated using (1) a partially coupled climate model (PCM) driven by observed wind stress and (2) a version of the ECMWF atmospheric model by means of a relaxation technique. We show that the tropical influence in the PCM is dominated by El Niño Southern Oscillation (ENSO) whereas the relaxation experiments suggest an additional influence independent of ENSO. In the observations, we find that the simultaneous influence of ENSO on the summer SAM was much stronger after 1979 than before, with the consequence that the ensemble mean of the PCM captures around 50 % of the interannual variance of the SAM after 1979 and less than 10 % before. Nevertheless, in the ensemble mean of the PCM, the relationship between ENSO and the summer SAM is stable throughout the whole period 1960/1961–2001/2002, and it is the individual ensemble members that exhibit a non-stationary relationship like that found in the observations. It follows that variability not related to the observed wind forcing used to drive the PCM is important for obscuring the ENSO/SAM relationship. The experiments using relaxation show that tropical forcing was important for both the interannual variability and the trend of the summer SAM, even before 1979. Adding the observed extratropical sea surface temperature and sea-ice (SSTSI) to the tropical relaxation runs improves the model performance, indicative of a positive feedback from extratropical SSTSI onto the SAM.
    Type: Article , PeerReviewed
    Format: text
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  • 9
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    In:  [Poster] In: Joint MiKlip/SPECS Meeting on Decadal Climate Prediction, 23.-26.02.2015, Offenbach .
    Publication Date: 2015-03-04
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 291-296 
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Widespread fatigue damage (WFD) is an important concern of aging aircrafts. Residualstrength of stiffened panels with widespread fatigue damage was evaluated by an engineeringapproach and a finite element method respectively. Nine stiffened panels with three types of damagewere tested for their residual strength. The predictions are in good agreement with the experimentresults and it is shown the methods could be used in an engineering practice for the residual strengthevaluation with the acceptable accuracy. It can be seen from this research that WFD could result insignificantly reduction in the residual strength of stiffened panels
    Type of Medium: Electronic Resource
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