A limit on the number density of bright z≈ 7 galaxies     

Elizabeth R. Stanway  Malcolm N. Bremer  Valentina Squitieri  Laura S. Douglas  Matthew D. Lehnert 《Monthly notices of the Royal Astronomical Society》2008,386(1):370-376

We present a survey of bright optical dropout sources in two deep, multiwavelength surveys comprising 11 widely separated fields, aimed at constraining the galaxy luminosity function at   z ≈ 7  for sources at  5–10  L * ( z = 6)  . Our combined survey area is 225 arcmin² to a depth of   J _AB= 24.2  (3σ) and 135 arcmin² to   J = 25.3  (4σ). We find that infrared data longwards of 2 μm are essential for classifying optical dropout sources, and in particular for identifying cool Galactic star contaminants. Our limits on the number density of high-redshift sources are consistent with current estimates of the Lyman break galaxy luminosity function at   z = 6  .  相似文献   

Pinliang Dong and Qi Chen: LiDAR Remote Sensing and Applications     

Lato  Matthew 《Mathematical Geosciences》2019,51(5):691-692

Mathematical Geosciences -  相似文献   

Optimal forcing of ENSO either side of the 1970’s climate shift and its implications for predictability     

Christopher M. Aiken  Agus Santoso  Shayne McGregor  Matthew H. England 《Climate Dynamics》2015,45(1-2):47-65

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Observed and modeled tsunami signals compared by using different rupture models of the April 1, 2014, Iquique earthquake     

Ignacia Calisto  Marisella Ortega  Matthew Miller 《Natural Hazards》2015,79(1):397-408

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Ownership and Spatial Distribution of Eagle Ford Mineral Wealth in Live Oak County,Texas     

Trey Murphy  Christian Brannstrom  Matthew Fry 《The Professional geographer》2017,69(4):616-628

U.S. unconventional hydrocarbon production is a driver of economic growth, but mineral wealth ownership is poorly understood and shrouded in “local wealth” mythology that claims royalties from hydrocarbons mostly benefit people who live near sites of production. Mineral property tax appraisals, as proxies for mineral wealth from Live Oak County, a representative Eagle Ford Shale county in Texas, show that 96 percent of assessed mineral wealth concentrates among energy firms and individuals in Texas metropolitan regions; 1.95 percent of mineral wealth remains “local” to the production county, challenging local wealth myths. Deviating from nation-state scalar approaches, local and regional spatial studies of other energy regions might reveal similar wealth distributions, enabling generalizations about hydrocarbon production economic outcomes.  相似文献   

Linking biogeochemical processes and historic primary producer communities in a SE USA sinkhole lake from the mid-Holocene to present     

Sean Michael Earley  Matthew Neal Waters  Donald Thieme  Joseph McDonald Smoak 《Journal of Paleolimnology》2017,57(4):295-306

Many freshwater resources receive materials from human development causing a decrease in ecological services when compared to pre-disturbance periods. As a result, the understanding of eutrophication and limnological change has increased, but less attention has been given to systems under intense human impact that have not eutrophied so that drivers precluding eutrophication can be documented. The primary objective of this research was to reconstruct allochthonous inputs and in-lake processes for Long Pond, Georgia, USA from the mid Holocene to present and link them to primary producer community changes. Long Pond is a mesotrophic lake located in a highly altered watershed from agricultural and municipal land use and housing developments. A 5 m sediment core was collected from Long Pond, and organic matter, nutrients (C, N, P), metals (Al, Fe, Cu), and photosynthetic pigments were measured. Long Pond existed in three limnological states spanning the past ~6000 years. Prior to modern lacustrine conditions, Long Pond was a wetland/peat system that experienced the highest primary producer abundance recorded in the core. The modern lacustrine state began in the late Holocene and was characterized by increased connectivity with the surrounding watershed and low productivity. Human impacts began around 1900 AD and included high levels of phosphorus and metal deposition but moderate levels of primary producer abundance. As a result, in-lake dynamics are believed to be regulating the trophic status of Long Pond. Low concentrations of available phosphorus in the water column combined with high concentrations of sedimentary phosphorus may imply the binding of phosphorus to the sediments by certain materials such as aluminum and iron. Long Pond serves as an example of the complex in-lake processes that can occur from allochthonous inputs and autochthonous responses in lake systems thus complicating management decisions.  相似文献   

Geographic Patterns of Craft Breweries at the Intraurban Scale     

Isabelle Nilsson  Neil Reid  Matthew Lehnert 《The Professional geographer》2018,70(1):114-125

This article examines the intraurban geography of craft breweries in ten cities across the United States. First, through an exhaustive literature review, we outline both supply- and demand-side factors that might cause craft breweries to cluster. Second, we empirically test whether these establishments tend to cluster within cities using spatial statistical techniques. Many communities are attempting to support the establishment of more craft breweries as a way to boost tourism and economic development. The findings from this article aid in this discussion by providing insights into how craft brewers locate and the factors that could influence their location decision behavior. Our findings suggest that craft brewers do in fact cluster. There are both supply and demand factors responsible. On the supply side, the collaborative environment within the industry and the artisan nature of the industry's products allows for benefits of clustering to outweigh the costs associated with this behavior. On the demand side, the emergence of “brewery districts” allows individual brewers to enjoy the reputation benefits associated with the district in terms of increased foot traffic from locals and visitors looking to sample a variety of beers.  相似文献   

Economic‐Development Stakeholder Perspectives on Boomtown Dynamics in the Eagle Ford Shale,Texas          下载免费PDF全文

Trey Murphy  Christian Brannstrom  Matthew Fry  Michael Ewers 《Geographical review》2018,108(1):24-44

Unconventional oil and gas production in the United States reversed a decades‐old trend of rising oil imports, provided an argument for lifting the U.S. crude oil export ban and motivated the development of domestic natural gas export facilities. But the most visible impact of unconventional‐hydrocarbon extraction is the creation of boomtowns in rural regions. Despite widespread media coverage, scholarly analysis of boomtowns is restricted to regional econometric studies with little attention to how economic stakeholders understand and respond to booming economies. Here we analyze interviews with key economic stakeholders in the Eagle Ford Shale in Texas. Respondents consider their community's economic success relative to the price of oil and indicate concerns about the deterioration of roads, high housing demand, and skyrocketing wages. We also re‐examine John Gilmore's foundational work on boomtowns in the 1970s in the context of contemporary unconventional extraction.  相似文献   

Is public awareness and perceived threat of climate change associated with governmental mitigation targets?     

Aaron Drummond  Lauren C. Hall  James D. Sauer  Matthew A. Palmer 《Climatic change》2018,149(2):159-171

Social scientists and science communicators are concerned about the apparent discrepancy between the scientific consensus on climate change (Anderegg et al. Proc Natl Acad Sci 107:12107–12109, 2010; Doran and Zimmerman EOS Trans Am Geophys Union 90:22–3, 2009) and the general public’s views (Knight Environ Sociol 2:101–113, 2016; Lee et al. Nat Clim Chang 5:1014–1020, 2015). It is reasoned that increased public awareness and perceived threat of climate change may pressure governments to enact policy to counteract climate change (e.g. setting stringent carbon emissions targets). Despite a logical link between public awareness and government-set emissions targets, this relationship remains untested. We examined the relationship between public awareness about and perceived threat of climate change and governmental emissions targets across 71 countries and 1 region. We found a positive association between the proportions of a country’s population that are aware of climate change and the unconditional emissions reduction targets set by that country in the Paris Agreement (Rogelj et al. Nature 534:631–639, 2016). However, the proportion of people in a country who perceive climate change as a personal threat was not associated with higher emissions reduction targets. Our results suggest that public awareness may be an important part of garnering the public support required for policies designed to mitigate climate change to succeed.  相似文献   

Future southcentral US wildfire probability due to climate change     

Michael C. Stambaugh  Richard P. Guyette  Esther D. Stroh  Matthew A. Struckhoff  Joanna B. Whittier 《Climatic change》2018,147(3-4):617-631

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