BAM‐S005 Type A and B: New Silicate Reference Glasses for Microanalysis     

Qi‐Chao Yang  Klaus Peter Jochum  Brigitte Stoll  Ulrike Weis  Dmitry Kuzmin  Michael Wiedenbeck  Heike Traub  Meinrat O. Andreae 《Geostandards and Geoanalytical Research》2012,36(3):301-313

To test whether the silicate reference glasses BAM‐S005‐A and BAM‐S005‐B from BAM (The Federal Institute for Materials Research and Testing, Germany) are suitable materials for microanalysis, we investigated the homogeneity of these reference glasses using the microanalytical techniques EPMA, LA‐ICP‐MS and SIMS. Our study indicated that all major and most trace elements are homogeneously distributed at micrometre sampling scale in both types of glass. However, some trace elements (e.g., Cs, Cl, Cr, Mo and Ni) seem to be inhomogeneously distributed. We also determined the composition of BAM‐S005‐A and BAM‐S005‐B. The EPMA data of major elements confirmed the information values specified by the certificate. With the exception of Sr, Ba, Ce and Pb, our trace element data by LA‐ICP‐MS were also in agreement with the certified values within the stated uncertainty limits. The reasons for the discrepancy in these four elements are still unclear. In addition, we report new data for twenty‐two further trace elements, for which the concentrations were not certified. Based on our investigation, we suggest that both of these materials are suitable for many microanalytical applications.  相似文献   

Geostandards and Geoanalytical Research Bibliographic Review 2016          下载免费PDF全文

Ulrike Weis  Beate Schwager  Brigitte Stoll  Uwe Nohl  Patricia Karlowski  Isabelle Leisgang  Florentine Zwillich  Klaus Peter Jochum 《Geostandards and Geoanalytical Research》2017,41(4):487-491

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Quantification of groundwater discharge into lakes using radon-222 as naturally occurring tracer     

Axel Schmidt  Christina E. Stringer  Ulrike Haferkorn  Michael Schubert 《Environmental Geology》2009,56(5):855-863

A case study was carried out with the aim to practically test whether estimates of groundwater discharge rates into dredging lakes can be made via an uncomplicated and straightforward technique using radon-222 as naturally-occurring groundwater tracer. Lake Ammelshainer See, a dredging, seepage lake, approximately 25 km east of Leipzig, Germany, was chosen as the investigation site. In order to evaluate changes in the spatial and temporal radon-222 patterns in the lake during different stages of stratification, sampling campaigns were conducted in April 2007 (well mixed stage) and in May 2007 (thermal stratification stage). Groundwater flow estimates were made using a radon mass balance approach accounting for all radon fluxes into and out of the lake and assuming steady-state conditions with respect to these radon fluxes. Once all positive and negative radon fluxes related to the lake water volume were determined, groundwater discharge was estimated by using the advective radon input and the radon activity concentration of the pore water as key parameters. The results showed that in case of a lake with a size and shape of Lake Ammelshainer See (530,000 m²) reasonable groundwater discharge estimates can be made by collection and analyzing just a few water samples and a few samples from the sediment layer.  相似文献   

Geostandards and Geoanalytical Research Bibliographic Review 2008     

Klaus Peter Jochum  Stefanie M. Brueckner  Uwe Nohl  Brigitte Stoll  Ulrike Weis 《Geostandards and Geoanalytical Research》2009,33(4):501-505

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High-resolution mm interferometry and the search for massive protostellar disks: the case of Cep-A HW2     

Claudia Comito  Peter Schilke  Ulrike Endesfelder  Izaskun Jiménez-Serra  Jesus Martín-Pintado 《Astrophysics and Space Science》2008,313(1-3):59-63

The direct detection of accretion onto massive protostars through rotating disks constitutes an important tile in the massive-star-formation-theory mosaic. This task is however observationally very challenging. A very interesting example is Cepheus A HW2. The properties of the molecular emission around this YSO seems to suggest the presence of a massive rotating disk (cf. Patel et al. in Nature 437:109, 2005). We have carried out sub-arcsec-resolution PdBI observations of high-density and shock tracers such as SO₂, SiO, CH₃CN, and CH₃OH towards the center of the outflow. A detailed analysis of the spatial distribution and of the velocity field traced by all observed species leads us to conclude that, on a ∼700 AU scale, the Cep-A “disk” is actually the result of the superposition of multiple hot-core-type objects, at least one of them ejecting an outflow at a small angle with respect to the line of sight. Together with the well-known large-scale outflow ejected by HW2, this setup makes for a very complex spatial and kinematic picture. Based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).  相似文献   

Aeolian geomorphology. An introduction     

Ulrike Rsner 《第四纪科学杂志》1999,14(1):97-97

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Characteristics of post-socialist urban transformation in East Central Europe   总被引：4，自引：0，他引：4  

Ulrike Sailer-Fliege 《GeoJournal》1999,49(1):7-16

The development of the post-socialist city has already been characterised by substantial restructuring processes. Particular emphasis should be drawn to the take-off of the tertiary sector and the comprehensive blight phenomena in the previously industrial areas. The urban housing sector has witnessed increasing housing affordability problems, a marginalisation of communal housing stock, an increase of segregation and an intensification of the decay in the old housing stock. In all East Central European states the spatial development processes of industry and services within the cities basically show clear parallels to the pattern of urban development in continental Europe. In Hungary housing policy, tenure structure and the level of segregation already show relatively closer similarities to the neoliberal, Anglo–American pattern of development. The other ECE states show closer similarities to the corporatist welfare states of continental Europe. As far as medium-term urban development in East Central Europe is concerned, it is to be assumed that – regardless of the specific path of further development – overall solutions shall not be found for the fundamental problems which are the legacy of the socialist era – the decay of old housing stock, large scale derelict industrial areas and the extent and deficiencies of high-rise housing estates. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Experimental subsolidus phase relations in the system CaCO3–CaMg(CO3)2 up to 6.5 GPa and implications for subducted marbles     

Jörg Hermann  Ulrike Troitzsch  Dean Scott 《Contributions to Mineralogy and Petrology》2016,171(10):84

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The influence of climate on water chemistry states and dynamics in rivers across Australia     

Anna Lintern  Shuci Liu  Camille Minaudo  Rémi Dupas  Danlu Guo  Kefeng Zhang  Ulrike Bende-Michl  Clément Duvert 《水文研究》2021,35(12):e14423

For effective water quality management and policy development, spatial variability in the mean concentrations and dynamics of riverine water quality needs to be understood. Using water chemistry (calcium, electrical conductivity, nitrate-nitrite, soluble reactive phosphorus, total nitrogen, total phosphorus and total suspended solids) data for up to 578 locations across the Australian continent, we assessed the impact of climate zones (arid, Mediterranean, temperate, subtropical, tropical) on (i) inter-annual mean concentration and (ii) water chemistry dynamics as represented by constituent export regimes (ratio of the coefficients of variation of concentration and discharge) and export patterns (slope of the concentration-discharge relationship). We found that inter-annual mean concentrations vary significantly by climate zones and that spatial variability in water chemistry generally exceeds temporal variability. However, export regimes and patterns are generally consistent across climate zones. This suggests that intrinsic properties of individual constituents rather than catchment properties determine export regimes and patterns. The spatially consistent water chemistry dynamics highlights the potential to predict riverine water quality across the Australian continent, which can support national riverine water quality management and policy development.  相似文献   

Cenozoic diatreme field in Chubut （Argentina） as evidence of phreatomagmatic volcanism accompanied with extensive Patagonian plateau basalt volcanism？     

Karoly Nemeth Ulrike Martin Miguel J. Haller Viviana I. Alric 《《幕》》2007,30(3):217-223

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