Tropical Atlantic variability and coupled model climate biases: results from the Tropical Atlantic Climate Experiment (TACE)     

W. E. Johns  P. Brandt  P. Chang 《Climate Dynamics》2014,43(11):2887-2887

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NORMATIVE POTENTIALS FOR RESIDENTIAL DEVELOPMENT     

Donald P. Brandt 《The Professional geographer》1974,26(3):303-309

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The environment of the earth: F. Delobeau. Reidel,Dordrecht, Holland, 1971. 125 pp. Price $10.80.     

John C. Brandt 《Icarus》1973,19(4):608-609

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Use of Geospatial Data and Technology for Wilderness Search and Rescue by Nonprofit Organizations     

Loren Pfau  Justine I. Blanford 《The Professional geographer》2018,70(3):434-442

Geospatial data and tools are key in locating lost or missing persons in as short a time as possible. In this study, we used a geographic information system (GIS) to analyze four years of search and rescue (SAR) mission data from Colorado to determine the appropriate use of GIS for volunteer-based SAR organizations with limited resources and GIS expertise. GIS can provide more sophisticated analyses of geospatial data than simple mapping technologies, but our findings indicated that complex spatial analysis might not be required on all missions, because the majority of missions were completed within six to ten hours. Instead, new technologies such as tablets with mapping software and online GIS systems that provide quick and easy access to up-to-date geospatial data such as imagery offer capabilities that could improve mission planning. Here we provide a framework in which SAR missions can apply geospatial technologies to aid with missions, identify critical “hotspots,” and enhance postanalysis and training. The work here is highly applicable for nonprofit SAR groups when deciding on what GIS technologies to consider for their areas.  相似文献   

Ultrasoft narrow-line Seyfert 1 galaxies and X-ray surveys     

N. Brandt  T. Boller 《Astronomische Nachrichten》1998,319(3):163-166

Note from the editor: This article is a re-print of the original, which appeared in Astron. Nachr. 319 (1/2), 7 (1998). In the original version the figure was ruined in the process of paper production and the scientific content of the paper considerably degraded. Instead of printing only the correct figure, thus loosing the scientific context, we decided to re-print the whole article. We describe how recent X-ray surveys have led to advances in the understanding of ultrasoft narrow-line Seyfert 1 galaxies. The number of known ultrasoft narrow-line Seyfert 1s has increased greatly in recent years due to X-ray surveys, and it is now possible to obtian high quality 0.1–10 keV spectral and variability measurements for a large number of these galaxies. We generalize some of the correlations between X-ray properties and optical emission line properties,focusing on how the ROSAT band spectral slope appears to be directly connected to the Boroson & Green (1992) primary eigenvector. We discuss how ultrasoft narrow-line Seyfert 1s may well have extremal values of a primary physical parameter, and we describe new projects that should further improve our understanding of these extreme representatives of Seyfert activity.  相似文献   

Influence of the equatorial deep jets on the north equatorial countercurrent   总被引：1，自引：1，他引：0  

Jan-Dirk Matthießen  Richard J. Greatbatch  Peter Brandt  Martin Claus  Sven-Helge Didwischus 《Ocean Dynamics》2015,65(8):1095-1102

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The X-ray variability of the Seyfert 1 galaxy MCG–6-30-15 from long ASCA and RXTE observations     

Julia C. Lee  †  A. C. Fabian  Christopher S. Reynolds  ‡  W. N. Brandt  Kazushi Iwasawa 《Monthly notices of the Royal Astronomical Society》2000,318(3):857-874

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Compton-thick X-ray absorption in the Seyfert galaxies Tololo 0109383 and ESO 138G1     

M. J. Collinge  W. N. Brandt 《Monthly notices of the Royal Astronomical Society》2000,317(2):L35-L39

We present analyses of the ASCA X-ray spectra of two Seyfert galaxies, Tololo 0109383 and ESO 138G1. In both cases, spectral fitting reveals two statistically acceptable continuum models: Compton reflection and partial covering. Both spectra have strong iron K lines, with equivalent widths greater than 1.5 keV. These large equivalent widths are suggestive of heavier obscuration than that directly indicated by the partial-covering models (  210²³ cm^-2),  with the actual column densities being 'Compton-thick' (i.e.   N _H1.510²⁴ cm^-2).  We use the hard X-ray/[O  iii ] flux correlation for Seyferts and data from the literature to provide additional support for this hypothesis. Since Tololo 0109383 is known to have optical type 1 characteristics such as broad Balmer line components and Fe  ii emission, this result marks it as a notable object.  相似文献   

Rapid invasion of Crassostrea gigas into the German Wadden Sea dominated by larval supply     

G. Brandt  A. Wehrmann  K.W. Wirtz   《Journal of Sea Research》2008,59(4):279-296

Invasions of non-indigenous species into coastal habitats have been a frequent phenomenon in the last decades, sometimes with significant impact on the receiving ecosystem. However, the understanding of the entire process and especially the relative importance of larval supply and local recruitment remains unclear. In this study, we simulate the invasion of a benthic invertebrate into a previously uncolonised habitat over several years and validate the results with field data. Therefore, we present field data from a monitoring programme revealing the rapid invasion of the oyster Crassostrea gigas into the East Frisian Wadden Sea, North Sea, between 2003 and 2005. The applied model combines a simple, spatially-explicit population dynamics model for the adult stage with a particle tracking model for the larval stage of the life cycle. Simulation results are able to reproduce the large-scale pattern of the field data and indicate a domination of larval supply on the population dynamics in the early stage of the invasion. Though monitoring and simulations suggest a single larval source outside the study area in the west, the population dynamics in the eastern part is only explainable with an additional source within the study area attributed to an unintentional input of juveniles by mussel fishery. High sensitivities to uncertain parameters result in distinct deviations between monitoring and simulations at particular sites. Especially the impact of site-specific variations of the post-settlement mortality underlines the variability of local recruitment conditions and indicates the need for spatially resolved information for exact predictions.  相似文献   

Changes in timber haul emissions in the context of shifting forest management and infrastructure     

Sean P Healey  Jock A Blackard  Todd A Morgan  Dan Loeffler  Greg Jones  Jon Songster  Jason P Brandt  Gretchen G Moisen  Larry T DeBlander 《Carbon balance and management》2009,4(1):9

Background  

Although significant amounts of carbon may be stored in harvested wood products, the extraction of that carbon from the forest generally entails combustion of fossil fuels. The transport of timber from the forest to primary milling facilities may in particular create emissions that reduce the net sequestration value of product carbon storage. However, attempts to quantify the effects of transport on the net effects of forest management typically use relatively sparse survey data to determine transportation emission factors. We developed an approach for systematically determining transport emissions using: 1) -remotely sensed maps to estimate the spatial distribution of harvests, and 2) - industry data to determine landscape-level harvest volumes as well as the location and processing totals of individual mills. These data support spatial network analysis that can produce estimates of fossil carbon released in timber transport.  相似文献