The INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS)     

Janet E. Drew  R. Greimel  M. J. Irwin  A. Aungwerojwit  M. J. Barlow  R. L. M. Corradi  J. J. Drake  B. T. Gänsicke  P. Groot  A. Hales  E. C. Hopewell  J. Irwin  C. Knigge  P. Leisy  D. J. Lennon  A. Mampaso  M. R. W. Masheder  M. Matsuura  L. Morales-Rueda  R. A. H. Morris  Q. A. Parker  S. Phillipps  P. Rodriguez-Gil  G. Roelofs  I. Skillen  J. L. Sokoloski  D. Steeghs  Y. C. Unruh  K. Viironen  J. S. Vink  N. A. Walton  A. Witham  N. Wright  A. A. Zijlstra  A. Zurita 《Monthly notices of the Royal Astronomical Society》2005,362(3):753-776

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Running Rotterdam: on how locals’ participation in running events fosters their sense of place     

Vink  Ryanne  Varró  Krisztina 《GeoJournal》2021,86(2):963-978

GeoJournal - Building on the insights of scholarship highlighting specific aspects of the forming of place meanings and experiences during running (events), this paper aims at applying a more...  相似文献   

A new concept for the combination of optical interferometers and high-resolution spectrographs     

Simon Albrecht  Andreas Quirrenbach  Robert N. Tubbs  Ramon Vink 《Experimental Astronomy》2010,27(3):157-186

The combination of high spatial and spectral resolution in optical astronomy enables new observational approaches to many open problems in stellar and circumstellar astrophysics. However, constructing a high-resolution spectrograph for an interferometer is a costly and time-intensive undertaking. Our aim is to show that, by coupling existing high-resolution spectrographs to existing interferometers, one could observe in the domain of high spectral and spatial resolution, and avoid the construction of a new complex and expensive instrument. We investigate in this article the different challenges which arise from combining an interferometer with a high-resolution spectrograph. The requirements for the different sub-systems are determined, with special attention given to the problems of fringe tracking and dispersion. A concept study for the combination of the VLTI (Very Large Telescope Interferometer) with UVES (UV-Visual Echelle Spectrograph) is carried out, and several other specific instrument pairings are discussed. We show that the proposed combination of an interferometer with a high-resolution spectrograph is indeed feasible with current technology, for a fraction of the cost of building a whole new spectrograph. The impact on the existing instruments and their ongoing programs would be minimal.  相似文献   

Detailed maps of interstellar clouds in front of ω Centauri: small-scale structures in the Galactic disc–halo interface     

Jacco Th. van Loon  Keith T. Smith  Iain McDonald  Peter J. Sarre  Stephen J. Fossey  Robert G. Sharp 《Monthly notices of the Royal Astronomical Society》2009,399(1):195-208

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Importance of terrestrially-derived,particulate phosphorus to phosphorus dynamics in a west coast estuary     

R. M. Chambers  J. W. Fourqurean  J. T. Hollibaugh  S. M. Vink 《Estuaries and Coasts》1995,18(3):518-526

Allochthonous inputs of suspended particulate matter from freshwater environments to estuaries influence nutrient cycling and ecosystem metabolism. Contributions of different biogeochemical reactions to phosphorus dynamics in Tomales Bay, California, were determined by measuring dissolved inorganic phosphorus exchange between water and suspended particulate matter in response to changes in salinity, pH, and sediment redox. In serum bottle incubations of suspended particulate matter collected from the major tributary to the bay, dissolved inorganic phosphorus release increased with salinity during the initial 8 h; between 1–3 d, however, rates of release were similar among treatments of 0 psu, 16 psu, 24 psu, and 32 psu. Release was variable over the pH range 4–8.5, but dissolved inorganic phosphorus releases from sediments incubated for 24 h at the pH of fresh water (7.3) and seawater (8.1) were similarly small. Under oxidizing conditions, dissolved inorganic phosphorus release was small or dissolved inorganic phosphorus was taken up by particulate matter with total P content <50 μmoles P g^?1; release was greater from suspended particulate matter with total phosphorus content >50 μmoles P g^?1. In contrast, under reducing conditions maintained by addition of free sulfide (HS^?), dissolved inorganic phosphorus was released from particles at all concentrations of total phosphorus in suspended particulate matter, presumably from the reduction of iron oxides. Since extrapolated dissolved inorganic phosphorus release from this abiotic source can account for only 12.5% of the total dissolved inorganic phosphorus flux from Tomales Bay sediments, we conclude most release from particles is due to organic matter oxidation that occurs after estuarine deposition. The abiotic, sedimentary flux of dissolved inorganic phosphorus, however, could contribute up to 30% of the observed net export of dissolved inorganic phosphorus from the entire estuary.  相似文献   

Origins of strandline duricrusts around the Makgadikgadi Pans (Botswana Kalahari) as deduced from their chemical and isotope composition     

S. Ringrose  C. Harris  P. Huntsman-Mapila  B.W. Vink  S. Diskins  C. Vanderpost  W. Matheson 《Sedimentary Geology》2009,219(1-4):262-279

Trace elements together with some O and C isotope analysis were undertaken on duricrust strandline deposits in the palaeo-Makgadikgadi sub-basin (PMSB) to provide insight into palaeo-climatic conditions through the interpretation of calcrete, silcrete–calcrete intergrade and silcrete deposits. Trace element content and relative abundance suggest that the duricrust origins are associated with the long-term weathering of the Karoo Large Igneous Province which underlies the PMSB. This work shows that duricrust origins are related to Ca²⁺ and Si (and associated trace elements) being transported mainly through the groundwater and then subsequently precipitated at different strandline elevations over time. Local groundwater feeding in towards the pan margin and accumulating in near-neutral pan-marginal pools, appears to facilitate Si concentration and permeation of pre-existing calcretes. The silica precipitates as the pH drops when renewed freshwater enters the pools. Hence the inferred palaeo-climatic regime for silcretisation may be similar to that occurring in Botswana at present being dry semi-arid with low seasonal rainfall. In contrast the extensive calcrete precipitation in the strandlines results from abundant Ca²⁺ in adjacent waters which appear to be derived from both local and regional sources. The arrival of Ca²⁺ from regional sources (shown by trace element evidence) infers heavy rainfall in the upper catchment suggesting a major humid event followed by regional drying. Palaeo-climatic inferences suggest the juxtaposition of major humid events interspersed with more normal semi-arid palaeo-climates with an exception obtained from isotope data, of drier and cooler conditions than usual for the region around 80–90 000 years ago. Whereas trace element data can greatly assist in the interpretation of complex deposits such as duricrusts, care should be taken over the use of particular ratios (such as Yb/Gd ratio) which may produce spurious results.  相似文献   

Spectropolarimetry of the massive post-red supergiants IRC +10420 and HD 179821     

M. Patel  R. D. Oudmaijer  J. S. Vink  J. E. Bjorkman  B. Davies  M. A. T. Groenewegen  A. S. Miroshnichenko  J. C. Mottram 《Monthly notices of the Royal Astronomical Society》2008,385(2):967-978

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On the consistency of the drag between air and water in meteorological,hydrodynamic and wave models     

Joana van Nieuwkoop  Peter Baas  Sofia Caires  Jacco Groeneweg 《Ocean Dynamics》2015,65(7):989-1000

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Persönliches     

E. Seibold  Dr. A. P. A. Vink 《International Journal of Earth Sciences》1965,54(2):1320-1322

Ohne Zusammenfassung  相似文献   

Holocene relative sea-level change, isostatic subsidence and the radial viscosity structure of the mantle of northwest Europe (Belgium, the Netherlands, Germany, southern North Sea)   总被引：1，自引：0，他引：1  

Annemiek Vink  Holger Steffen  Lutz Reinhardt  Georg Kaufmann 《Quaternary Science Reviews》2007,26(25-28):3249-3275

A comprehensive observational database of Holocene relative sea-level (RSL) index points from northwest Europe (Belgium, the Netherlands, northwest Germany, southern North Sea) has been compiled in order to compare and reassess the data collected from the different countries/regions and by different workers on a common time–depth scale. RSL rise varies in magnitude and form between these regions, revealing a complex pattern of differential crustal movement which cannot be solely attributed to tectonic activity. It clearly contains a non-linear, glacio- and/or hydro-isostatic subsidence component, which is only small on the Belgian coastal plain but increases significantly to a value of ca 7.5 m relative to Belgium since 8 cal. ka BP along the northwest German coast. The subsidence is at least in part related to the Post-Glacial collapse of the so-called peripheral forebulge which developed around the Fennoscandian centre of ice loading during the Last Glacial Maximum. The RSL data have been compared to geodynamic Earth models in order to infer the radial viscosity structure of the Earth's mantle underneath NW Europe (lithosphere thickness, upper- and lower-mantle viscosity), and conversely to predict RSL in regions where we have only few observational data (e.g. in the southern North Sea). A very broad range of Earth parameters fit the Belgian RSL data, suggesting that glacial isostatic adjustment (GIA) only had a minor effect on Belgian crustal dynamics during and after the Last Ice Age. In contrast, a narrow range of Earth parameters define the southern North Sea region, reflecting the greater influence of GIA on these deeper/older samples. Modelled RSL data suggest that the zone of maximum forebulge subsidence runs in a relatively narrow, WNW–ESE trending band connecting the German federal state of Lower Saxony with the Dogger Bank area in the southern North Sea. Identification of the effects of local-scale factors such as past changes in tidal range or tectonic activity on the spatial and temporal variations of sea-level index points based on model-data comparisons is possible but is still complicated by the relatively large range of Earth model parameters fitting each RSL curve, emphasising the need for more high-quality observational data.  相似文献