A5069364097- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Plant Reproductive Biology
- Fire effects on ecosystems
- Atmospheric Ozone and Climate
- Plant Molecular Biology Research
- Plant and animal studies
- Photosynthetic Processes and Mechanisms
- Air Quality and Health Impacts
- Aluminum Alloys Composites Properties
- Vehicle emissions and performance
- Lichen and fungal ecology
- Indoor Air Quality and Microbial Exposure
- Computability, Logic, AI Algorithms
- Hydrocarbon exploration and reservoir analysis
- Mechanical Engineering and Vibrations Research
- History of Science and Medicine
- Meteorological Phenomena and Simulations
- Cellular and Composite Structures
- Historical Philosophy and Science
- Archaeological Research and Protection
- Advanced ceramic materials synthesis
- Icing and De-icing Technologies
- Neuroscience and Neuropharmacology Research
Environment and Climate Change Canada
2016-2025
University of Worcester
2019-2024
University of Colorado Colorado Springs
2017
University of Virginia
2016
University of British Columbia
2009-2014
Exmouth Hospital
2013
Victoria and Albert Museum
1999-2011
University of Birmingham
1999-2010
Alion Science and Technology (United States)
2009
Triangle
2009
Detailed knowledge of the physical and chemical properties sources particles that form clouds is especially important in pristine areas like Arctic, where particle concentrations are often low observations sparse. Here, we present situ cloud aerosol measurements from central Arctic Ocean August-September 2018 combined with air parcel source analysis. We provide direct experimental evidence Aitken mode (particles diameters ≲70 nm) significantly contribute to condensation nuclei (CCN) or...
Dry deposition is an important yet poorly constrained process that removes reactive organic carbon from the atmosphere, making it unavailable for airborne chemical reactions and transferring to other environmental systems. Using aircraft-based measurement method, we provide large-scale estimates of total gas-phase rates fluxes. Observed downwind unconventional oil operations reached up 100 tC hour −1 , with fluxes exceeding 0.1 gC m −2 . The observed lifetimes (τ dep ) were short enough...
The onset conditions for ice nucleation on H 2 SO 4 coated, (NH ) and uncoated kaolinite particles at temperatures ranging from 233 to 246 K were studied. We define the as relative humidity temperature which first event was observed. Uncoated excellent nuclei; with respect (RH i below 110% all studied, consistent previous measurements. coatings, however, drastically altered nucleating ability of particles, increasing RH required by approximately 30%, similar recent measurements Möhler et al....
Abstract. We studied the ice nucleation properties of 12 different species fungal spores chosen from three classes: Agaricomycetes, Ustilaginomycetes, and Eurotiomycetes. Agaricomycetes include many types mushroom are widely distributed over globe. Ustilaginomycetes agricultural pathogens have caused widespread damage to crops. Eurotiomycetes found on all decaying material important human allergens. focused these classes because they thought be abundant in atmosphere there is very little...
Rust and bunt spores that act as ice nuclei (IN) could change the formation characteristics properties of ice‐containing clouds. In addition, nucleation on rust spores, followed by precipitation, may be an important removal mechanism these from atmosphere. Using optical microscope, we studied four species ( Puccinia graminis , triticina allii Endocronartium harknesssii ) two Tilletia laevis tritici immersed in water droplets. We show cumulative number IN per spore is 5 × 10 −3 0.01, 0.10 at...
Abstract. Deposition nucleation on two mineral species, kaolinite and illite, was studied using a flow cell coupled to an optical microscope. The results show that the Sice conditions when ice first nucleated, defined as onset (Sice,onset), is strong function of surface area available for nucleation, varying from 100% 125% at temperatures between 242 239 K. dependent data could not be described accurately classical theory assumption single contact angle (defined here single-α model). These...
Sooty blotch and flyspeck (SBFS) fungi on apple fruit were sampled from nine orchards in four midwestern U.S. states during 2000 30 10 eastern 2005 order to estimate taxonomic diversity discern patterns of geographic distribution. Forty per orchard arbitrarily colonies each mycelial phenotype counted apple. Representative isolated, cultures purified, DNA was extracted. For representative isolates, the internal transcribed spacer (ITS) large subunit (LSU) regions ribosomal amplified...
Cell-cell communication is vital to multicellular organisms and much of it controlled by the interactions secreted protein ligands (or other molecules) with cell surface receptors. In plants, receptor-ligand are known control phenomena as diverse floral abscission, shoot apical meristem maintenance, wound response, self-incompatibility (SI). SI, in which 'self' (incompatible) pollen rejected, a classic cell-cell recognition system. Genetic SI maintained an S-locus, male (pollen) female...
Abstract In this study, a series of fog events that occurred near Halifax, Canada, during 20 June to 31 July 2016 are investigated using the Weather Research and Forecasting Model Version 3.8.1 (WRF), in comparison with situ satellite remotely sensed observations from Moderate Resolution Imaging Spectroradiometer. We evaluate five planetary boundary layer (PBL) schemes available WRF. Results show these PBL lead overestimates liquid water content, especially nonlocal schemes, they biased...
Abstract. Forest fires are major contributors of reactive gas- and particle-phase organic compounds to the atmosphere. We used offline high-resolution tandem mass spectrometry perform a molecular-level speciation sampled via aircraft from an evolving boreal forest fire smoke plume in Saskatchewan, Canada. observed diverse multifunctional containing oxygen, nitrogen, sulfur (CHONS), whose structures, formation, impacts understudied. The dilution-corrected absolute ion abundance CHONS...
Abstract. Wildfire impacts on air quality and climate are expected to be exacerbated by change with the most pronounced in boreal biome. Despite large geographic coverage, there is limited information forest wildfire emissions, particularly for organic compounds, which critical inputs model predictions of downwind impacts. In this study, airborne measurements 193 compounds from 15 instruments, including 173 non-methane organics (NMOG), were used provide detailed characterization, date,...
Abstract Measurement-based estimates of greenhouse gas (GHG) emissions from complex industrial operations are challenging to obtain, but serve as an important, independent check on inventory-reported emissions. Such top–down estimates, while important for oil and (O&G) globally, particularly relevant Canadian sands (OS) operations, which represent the largest O&G contributor national GHG We present a multifaceted approach estimating CO2 that combines aircraft-measured CO2/NOx...
Ice nucleation on mineral dust particles is known to be an important process in the atmosphere. To accurately implement ice atmospheric simulations, a suitable theory or scheme desirable describe laboratory freezing data models. In following, we investigated by supermicron [kaolinite and Arizona Test Dust (ATD)] immersion mode. The median temperature for ATD was measured approximately −30 °C compared with −36 kaolinite. results were then used test four different schemes previously terms of...
Abstract Arctic clouds are sensitive to atmospheric particles since these sometimes in such low concentrations that cannot always form under supersaturated water vapor conditions. This is especially true the late summer, when aerosol generally very high Arctic. The environment changes rapidly around freeze‐up as open waters close and snow starts accumulating on ice. We investigated droplet formation during eight significant fog events central Ocean, north of 80°, from August 12 19 September...
Description de la technologie developpee pour construction des chassis et carrosseries automobiles a partir toles en aluminium collees
Abstract An effective and efficient error estimation scheme for finite element plate shell analysis is presented. The estimate method proposed applicable to all the elements developed using either classical or continuum mechanics theories. global in energy norm computed by summing elemental errors. well suited adaptive mesh refinement as contribution each known. Demonstration examples uniform schemes both show effectiveness of proposed.
Introduction The endocannabinoid (eCB) system is named after the discovery that endogenous cannabinoids bind to same receptors as phytochemical compounds found in Cannabis. While include anandamide (AEA) and 2-arachidonoylglycerol (2-AG), exogenous phytocannabinoids Δ-9 tetrahydrocannabinol (THC) cannabidiol (CBD). These finely tune neurotransmission following synapse activation, via retrograde signaling activates cannabinoid receptor 1 (CB1R) and/or transient potential cation channel...
Mechanical properties of Nicalon‐fiber‐reinforced silicon carbide matrix composites were evaluated, in flexure, at various temperatures ranging from ambient to 1300°C. First cracking stress ranged 250 280 MPa and was relatively insensitive test temperature. The measured ultimate strength showed a small increase room‐temperature value 370 460 800°C. Beyond 800°C, however, dropped as low This decrease elevated is believed be partly due degradation situ Nicalon fiber strength. Scanning electron...