Browsing Faculty of Arts and Sciences by Title
Now showing items 9213-9232 of 24540
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Glioblastoma Mimicking an Arteriovenous Malformation
(Frontiers Media S.A., 2013)Abnormal cerebral vasculature can be a manifestation of a vascular malformation or a neoplastic process. We report the case of a patient with angiography-negative subarachnoid hemorrhage (SAH) who re-presented 3 years later ... -
Global 21 cm signal experiments: A designer’s guide
(American Physical Society, 2013)The global (i.e., spatially averaged) spectrum of the redshifted 21 cm line has generated much experimental interest lately, thanks to its potential to be a direct probe of the epoch of reionization and the dark ages, ... -
Global 3-D Land-Ocean-Atmosphere Model for Mercury: Present-Day Versus Preindustrial Cycles and Anthropogenic Enrichment Factors for Deposition
(American Geophysical Union, 2008)We develop a mechanistic representation of land-atmosphere cycling in a global 3-D ocean-atmosphere model of mercury (GEOS-Chem). The resulting land-ocean-atmosphere model is used to construct preindustrial and present ... -
Global 3-D Model Analysis of the Seasonal Cycle of Atmospheric Carbonyl Sulfide: Implications for Terrestrial Vegetation Uptake
(American Geophysical Union, 2008)We use a global 3-D simulation of atmospheric carbonyl sulfide (COS) to interpret observations at a network of surface sites. We aim to identify the primary factors underlying observed seasonal variations and to constrain ... -
Global and Local Monitors to Enforce Noninterference in Concurrent Programs
(2015)Controlling confidential information in concurrent systems is difficult, due to covert channels resulting from interaction between threads. This problem is exacerbated if threads share resources at fine granularity. In ... -
Global and regional decreases in tropospheric oxidants from photochemical effects of aerosols
(Wiley-Blackwell, 2003)We evaluate the sensitivity of tropospheric OH, O3, and O3 precursors to photochemical effects of aerosols not usually included in global models: (1) aerosol scattering and absorption of ultraviolet radiation and (2) ... -
Global and regional variability in marine surface temperatures
(Wiley-Blackwell, 2014)The temperature variability simulated by climate models is generally consistent with that observed in instrumental records at the scale of global averages, but further insight can also be obtained from regional analysis ... -
Global atmospheric model for mercury including oxidation by bromine atoms
(Copernicus GmbH, 2010)Global models of atmospheric mercury generally assume that gas-phase OH and ozone are the main oxidants converting Hg0 to HgII and thus driving mercury deposition to ecosystems. However, thermodynamic considerations argue ... -
Global Biogeochemical Implications of Mercury Discharges from Rivers and Sediment Burial
(American Chemical Society (ACS), 2014)Rivers are an important source of mercury (Hg) to marine ecosystems. Based on an analysis of compiled observations, we estimate global present-day Hg discharges from rivers to ocean margins are 27 plus or minus 13 Mmol a ... -
Global Budget and Radiative Forcing of Black Carbon Aerosol: Constraints from Pole-to-Pole (HIPPO) Observations across the Pacific
(Wiley-Blackwell, 2014)We use a global chemical transport model (GEOS-Chem) to interpret aircraft curtain observations of black carbon (BC) aerosol over the Pacific from 85°N to 67°S during the 2009–2011 HIAPER (High-Performance Instrumented ... -
Global budget of black carbon aerosol and implications for climate forcing
(2014-02-25)This thesis explores the factors controlling the distribution of black carbon (BC) in the atmosphere/troposphere and its implications for climate forcing. BC is of great climate interest because of its warming potential. ... -
Global Budget of Ethane and Regional Constraints on U.S. Sources
(American Geophysical Union, 2008)We use a 3-D chemical transport model (the GEOS-Chem CTM) to evaluate a global emission inventory for ethane (C2H6), with a best estimate for the global source of 13 Tg yr−1, 8.0 Tg yr−1 from fossil fuel production, 2.6 ... -
Global Budget of Methanol: Constraints from Atmospheric Observations
(American Geophysical Union, 2005)We use a global three-dimensional model simulation of atmospheric methanol to examine the consistency between observed atmospheric concentrations and current understanding of sources and sinks. Global sources in the model ... -
Global Budgets of Atmospheric Glyoxal and Methylglyoxal, and Implications for Formation of Secondary Organic Aerosols
(American Geophysical Union, 2008)We construct global budgets of atmospheric glyoxal and methylglyoxal with the goal of quantifying their potential for global secondary organic aerosol (SOA) formation via irreversible uptake by aqueous aerosols and clouds. ... -
Global change: Interglacial and future sea level
(Nature Publishing Group, 2009)A merger of data and modelling using a probabilistic approach indicates that sea level was much higher during the last interglacial than it is now, providing telling clues about future ice-sheet responses to warming. -
Global chemical model analysis of biomass burning and lightning influences over the South Pacific in austral spring
(Wiley-Blackwell, 2002)A global three-dimensional model of tropospheric chemistry driven by reanalyzed European Centre for Medium-Range Weather Forecasts meteorological data is used to examine the sources of O3, CO, and nitrogen oxides (NOx = ... -
Global Concentrations of Gaseous Elemental Mercury and Reactive Gaseous Mercury in the Marine Boundary Layer
(American Chemical Society (ACS), 2010)Gaseous elemental mercury (GEM) and reactive gaseous mercury (RGM) were measured during an eight month circumnavigation to obtain knowledge of their worldwide distributions in the marine boundary layer (MBL). Background ... -
Global Currency Hedging
(Blackwell Publishing, 2009)Over the period 1975 to 2005, the US dollar (particularly in relation to the Canadian dollar) and the euro and Swiss franc (particularly in the second half of the period) have moved against world equity markets. Thus these ... -
Global Current Account Imbalances and Exchange Rate Adjustments
(Johns Hopkins University Press, 2005) -
The Global Diffusion of Public Policies: Social Construction, Coercion, Competition, or Learning?
(Annual Reviews, 2007)Social scientists have sketched four distinct theories to explain a phenomenon that appears to have ramped up in recent years, the diffusion of policies across countries. Constructivists trace policy norms to expert epistemic ...