Long-term evolution of fish communities in European mountainous rivers: past log driving effects,river management and species introduction (Salzach River,Danube)     

Gertrud Haidvogl  Didier Pont  Horst Dolak  Severin Hohensinner 《Aquatic Sciences - Research Across Boundaries》2015,77(3):395-410

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Submarine ridges do not prevent large-scale dispersal of abyssal fauna: A case study of Mesocletodes (Crustacea, Copepoda, Harpacticoida)     

Lena Menzel  Kai Horst GeorgePedro Martínez Arbizu 《Deep Sea Research Part I: Oceanographic Research Papers》2011,58(8):839-864

We examined the large-scale distribution of deep-sea harpacticoid copepods at the species level, in order to clarify the underlying processes of copepod dispersal. The study was based on samples collected from 12 regions and a total of 113 stations: 57 stations at depths between 1107 and 5655 m on abyssal plains in the South and North Atlantic, Southern Ocean, southern Indian Ocean, and the Pacific Ocean, and 56 stations above 900 m in the North Atlantic and eastern Mediterranean Sea.We chose the genus Mesocletodes Sars, 1909 as an ideal group to study the large-scale distribution of harpacticoid copepods in the deep oceans. Clear apomorphies and a comparatively large body size of about 1 mm allow rapid recognition of allied species in meiofauna samples. In addition, Mesocletodes represents more than 50% of the family Argestidae Por, 1986, one of the most abundant harpacticoid families in the deep sea.The geographical distributions of 793 adult females of Mesocletodes belonging to 61 species throughout the South and North Atlantic, Southern Ocean, southern Indian Ocean, Pacific Ocean, and eastern Mediterranean Sea indicated that most species are cosmopolitan. Neither the topography of the sea bottom nor long distances seem to prevent species from dispersing. Passive transport by bottom currents after resuspension is likely the propulsive factor for the dispersal of Harpacticoida, while plate tectonics and movement of individuals in the sediment may play relatively minor roles.  相似文献   

Water Treatment Technologies for PFAS: The Next Generation          下载免费PDF全文

John Horst  Jeff McDonough  Ian Ross  Michael Dickson  Jonathan Miles  Jake Hurst  Peter Storch 《Ground Water Monitoring & Remediation》2018,38(2):13-23

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The Emergence of Digital Twins in Remediation: How Platform Synchrony Will Change the Model for Delivery     

John Horst  Nick Welty  Allison Yanites  Francois Appere  Monica Dupre  Shahansha Shaik 《Ground Water Monitoring & Remediation》2020,40(3):14-20

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Qualitätssicherung beim chemischen Meeresmonitoring     

Woitke  Peter  Gaul  Horst 《Ocean Dynamics》1999,51(10):171-177

Ocean Dynamics - Für eine Bewertung des Zustands der Meeresumwelt sind die Richtigkeit und die Vergleichbarkeit der im marinen Monitoring erhobenen Daten wesentliche Voraussetzungen. Ein...  相似文献   

Testing the blast wave model with Swift GRBs     

P. A. Curran  R. L. C. Starling  A. J. van der Horst  R. A. M. J. Wijers 《Monthly notices of the Royal Astronomical Society》2009,395(1):580-592

The complex structure of the light curves of Swift Gamma-Ray Bursts (GRBs) has made the identification of breaks, and the interpretation of the blast wave caused by the burst, more difficult than in the pre- Swift era. We aim to identify breaks, which are possibly hidden, and to constrain the blast wave parameters; electron energy distribution, p , density profile of the circumburst medium, k , and the continued energy injection index, q . We do so by comparing the observed multiwavelength light curves and X-ray spectra of our sample to the predictions of the blast wave model. We can successfully interpret all of the bursts in our sample of 10, except two, within this framework and we can estimate, with confidence, the electron energy distribution index for 6 of the sample. Furthermore, we identify jet breaks in a number of the bursts. A statistical analysis of the distribution of p reveals that, even in the most conservative case of least scatter, the values are not consistent with a single, universal value. The values of k suggest that the circumburst density profiles are not drawn from only one of the constant density or wind-like media populations.  相似文献   

Ground-based calibration and characterization of the Fermi gamma-ray burst monitor detectors     

E. Bissaldi  A. von Kienlin  G. Lichti  H. Steinle  P. N. Bhat  M. S. Briggs  G. J. Fishman  A. S. Hoover  R. M. Kippen  M. Krumrey  M. Gerlach  V. Connaughton  R. Diehl  J. Greiner  A. J. van der Horst  C. Kouveliotou  S. McBreen  C. A. Meegan  W. S. Paciesas  R. D. Preece  C. A. Wilson-Hodge 《Experimental Astronomy》2009,24(1-3):47-88

One of the scientific objectives of NASA’s Fermi Gamma-ray Space Telescope is the study of Gamma-Ray Bursts (GRBs). The Fermi Gamma-Ray Burst Monitor (GBM) was designed to detect and localize bursts for the Fermi mission. By means of an array of 12 NaI(Tl) (8 keV to 1 MeV) and two BGO (0.2 to 40 MeV) scintillation detectors, GBM extends the energy range (20 MeV to > 300 GeV) of Fermi’s main instrument, the Large Area Telescope, into the traditional range of current GRB databases. The physical detector response of the GBM instrument to GRBs is determined with the help of Monte Carlo simulations, which are supported and verified by on-ground individual detector calibration measurements. We present the principal instrument properties, which have been determined as a function of energy and angle, including the channel-energy relation, the energy resolution, the effective area and the spatial homogeneity.  相似文献   

Man's role in changing the coastal landscapes in Denmark     

Horst Meesenburg 《GeoJournal》1996,39(2):143-151

This article describes the influence of man on the coastal landscapes along the Danish and part of the German west coast. While the tidal coast south of Blåvandshuk was formed by man since premedieval times, the northern part of Jutlands coast nearly avoided human influence until the late 19th century when dune plantation and coast protection was begun. At the same time, the first harbours were built by the Danish state, mainly for fishing purposes. The human influence increased through the 20th century, with tourism as a main factor. The article highlights the radical changes and the fragile balance between human action and natural processes on a debris coast. The article summarizes some of the authors contributions in the Danish landscape magazine Bygd, of which he is editor.  相似文献   

Footprint estimation for scalar flux measurements in the atmospheric surface layer   总被引：12，自引：2，他引：12  

T. W. Horst  J. C. Weil 《Boundary-Layer Meteorology》1992,59(3):279-296

The flux footprint is the contribution, per unit emission, of each element of a surface area source to the vertical scalar flux measured at height z _m ; it is equal to the vertical flux from a unit surface point source. The dependence of the flux footprint on crosswind location is shown to be identical to the crosswind concentration distribution for a unit surface point source; an analytic dispersion model is used to estimate the crosswind-integrated flux footprint. Based on the analytic dispersion model, a normalized crosswind-integrated footprint is proposed that principally depends on the single variable z/z _m , where z is a measure of vertical dispersion from a surface source. The explicit dependence of the crosswind-integrated flux footprint on downwind distance, thermal stability and surface roughness is contained in the dependence of z on these variables. By also calculating the flux footprint with a Lagrangian stochastic dispersion model, it is shown that the normalized flux footprint is insensitive to the analytic model assumption of a self-similar vertical concentration profile.The National Center for Atmospheric Research is funded by the National Science Foundation.  相似文献   

Intercomparison of sediment sampling techniques by means of radionuclide and heavy metal analysis     

Dr. Hartmut Nies  Dr. Horst Albrecht  Volker Rechenberg  Ingo Goroncy  Dr. Henning Dahlgaard  Dietmar Weiß  Prof. Dr. Lutz Brügmann 《Ocean Dynamics》1990,43(1):27-53

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