9,730 research outputs found
Le lemme fondamental pond\'er\'e pour le groupe m\'etaplectique
We state a variant of Arthur's weighted fundamental lemma for the metaplectic
group of Weil, which will be an essential ingredient of the stable trace
formula. Over a local field of large enough residual characteristic, we give a
proof using the method of descent, which is conditional upon the weighted
nonstandard fundamental lemma on Lie algebras. In view of the works of
Chaudouard and Laumon, this condition is expected to hold.Comment: 41 page
Wildfire Smoke Particle Properties and Evolution, from Space-Based Multi-Angle Imaging
Emitted smoke composition is determined by properties of the biomass burning source and ambient ecosystem. However, conditions that mediate the partitioning of black carbon (BC) and brown carbon (BrC) formation, as well as the spatial and temporal factors that drive particle evolution, are not understood adequately for many climate and air-quality related modeling applications. In situ observations provide considerable detail about aerosol microphysical and chemical properties, although sampling is extremely limited. Satellites offer the frequent global coverage that would allow for statistical characterization of emitted and evolved smoke, but generally lack microphysical detail. However, once properly validated, data from the National Aeronautics and Space Administration (NASA) Earth Observing Systems Multi-Angle Imaging Spectroradiometer (MISR) instrument can create at least a partial picture of smoke particle properties and plume evolution. We use in situ data from the Department of Energys Biomass Burning Observation Project (BBOP) field campaign to assess the strengths and limitations of smoke particle retrieval results from the MISR Research Aerosol (RA) retrieval algorithm. We then use MISR to characterize wildfire smoke particle properties and to identify the relevant aging factors in several cases, to the extent possible. The RA successfully maps qualitative changes in effective particle size, light absorption, and its spectral dependence, when compared to in situ observations. By observing the entire plume uniformly, the satellite data can be interpreted in terms of smoke plume evolution, including size-selective deposition, new-particle formation, and locations within the plume where BC or BrC dominates
La formule des traces pour les rev\^etements de groupes r\'eductifs connexes. III. Le d\'eveloppement spectral fin
We pursue Arthur's invariant trace formula for certain coverings of connected
reductive groups by deducing explicit formulas for its spectral side. This is
based on some results in local harmonic analysis from an earlier preprint. The
arguments are due to Arthur, and we will explain the necessary fine-tunings for
coverings.Comment: 30 page
CLIENT-SIDE SESSION-BASED CONTEXTUAL USER MODEL BUILDER
A client-side user model is created and maintained for use in selecting content. For example, a user model builder creates and updates a client-side user model. The client-side user model is populated with information from a video-specific user model received from a server and updated at the client side using information from a user activity history, including a video watching history. When requesting a video from the server, the client device can send a user profile derived from the client-side user model. The server can use information from the user profile to personalize content provided to the client device
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Issue Brief: Minority Religions and Public Opinion
This issue brief examines public opinion of minority religions in the United States. While Americans generally possess non-dogmatic views on religion, certain minorities, especially Muslim Americans, have garnered unfavorable sentiments from the American public
The Trapping and Characterization of a Single Hydrogen Molecule in a Continuously Tunable Nanocavity
Using inelastic electron tunneling spectroscopy with the scanning tunneling
microscope (STM-IETS) and density functional theory calculations (DFT), we
investigated properties of a single H2 molecule trapped in nanocavities with
controlled shape and separation between the STM tip and the Au (110) surface.
The STM tip not only serves for the purpose of characterization, but also is
directly involved in modification of chemical environment of molecule. The bond
length of H2 expands in the atop cavity, with a tendency of dissociation when
the gap closes, whereas it remains unchanged in the trough cavity. The
availability of two substantially different cavities in the same setup allows
understanding of H2 adsorption on noble metal surfaces and sets a path for
manipulating a single chemical bond by design.Comment: 11 pages, 4 figure
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