T. Bridges

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  • In Linkov, Ramadan, I Linkov, A Varghese, T P Seager, G Kiker +1 other
  • 2004
Decision-making in environmental projects is typically a complex and confusing exercise, characterized by trade-offs between socio-political, environmental, and economic impacts. Cost-benefit analyses are often used, occasionally in concert with comparative risk assessment, to choose between competing project alternatives. The selection of appropriate(More)
The large-scale structure in the distribution of galaxies is thought to arise from the gravitational instability of small fluctuations in the initial density field of the Universe. A key test of this hypothesis is that forming superclusters of galaxies should generate a systematic infall of other galaxies. This would be evident in the pattern of recessional(More)
Contaminated sediments and other sites present a difficult challenge for environmental decisionmakers. They are typically slow to recover or attenuate naturally, may involve multiple regulatory agencies and stakeholder groups, and engender multiple toxicological and ecotoxicological risks. While environmental decision-making strategies over the last several(More)
contract NAS 5-26555. These observations are associate with proposal IDs 5907 and 5464. ABSTRACT Mayall II ≡ G1 is one of the brightest globular clusters belonging to M31, the Andromeda galaxy. Our observations with the Wide Field and Planetary camera WFPC2 onboard the Hubble Space Telescope (HST) provide photometric data for the I vs. V − I and V vs. V − I(More)
Decision-making in environmental projects can be complex and seemingly intractable, principally due to the inherent existence of tradeoffs between sociopolitical, environmental, and economic factors. One tool that has been used to support environmental decision-making is comparative risk assessment (CRA). Central to CRA is the construction of a(More)
  • A D Mackey, A Huxor, A M N Ferguson, N R Tanvir, M Irwin, R Ibata +3 others
  • 2006
ACS photometry of newly-discovered globular clusters in the outer halo of M31 ABSTRACT We report the first results from deep ACS imaging of ten classical globular clusters in the far outer regions (15 R p 100 kpc) of M31. Eight of the clusters , including two of the most remote M31 globular clusters presently known, are described for the first time. Our(More)
  • A D Mackey, A Huxor, A M N Ferguson, N R Tanvir, M Irwin, R Ibata +3 others
  • 2006
ACS photometry of extended, luminous globular clusters in the outskirts of M31 ABSTRACT A new population of extended, luminous globular clusters has recently been discovered in the outskirts of M31. These objects have luminosities typical of classical globular clusters, but much larger half-light radii. We report the first results from deep ACS imaging of(More)
Comparative risk assessment (CRA) has been used as an environmental decision making tool at a range of regulatory levels in the past two decades. Contaminated and uncontaminated sediments are currently managed using a range of approaches and technologies; however, a method for conducting a comprehensive, multidimensional assessment of the risks, costs and(More)
PURPOSE: Recent severe storm experiences in the U.S. Gulf Coast illustrate the importance of an integrated approach to natural disaster preparedness planning that harmonizes efforts of implementing agencies and stakeholders. Risk management decisions that are informed by and address risk perceptions and behavior of decision makers and stakeholders are(More)
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