19,803 research outputs found
Movement of suspended particle and solute concentrations with inflow and tidal action
There are no author-identified significant results in this report
Mapping suspended particle and solute concentrations from satellite data
There are no author-identified significant results in this report
Cryogenic adhesives and sealants: Abstracted publications
Abstracts of primary documents containing original experimental data on the properties of adhesives and sealants at cryogenic temperatures are presented. The most important references mentioned in each document are cited. In addition, a brief annotation is given for documents considered secondary in nature, such as republications or variations of original reports, progress reports leading to final reports included as primary documents, and experimental data on adhesive properties at temperatures between about 130 K and room temperature
Modular perverse sheaves on flag varieties I: tilting and parity sheaves
In this paper we prove that the category of parity complexes on the flag
variety of a complex connected reductive group is a "graded version" of the
category of tilting perverse sheaves on the flag variety of the dual group, for
any field of coefficients whose characteristic is good. We derive some
consequences on Soergel's modular category O, and on multiplicities and
decomposition numbers in the category of perverse sheaves.Comment: 42 pages; with a joint appendix with Geordie Williamso
A unifying representation for a class of dependent random measures
We present a general construction for dependent random measures based on
thinning Poisson processes on an augmented space. The framework is not
restricted to dependent versions of a specific nonparametric model, but can be
applied to all models that can be represented using completely random measures.
Several existing dependent random measures can be seen as specific cases of
this framework. Interesting properties of the resulting measures are derived
and the efficacy of the framework is demonstrated by constructing a
covariate-dependent latent feature model and topic model that obtain superior
predictive performance
Diffusion Approximations for Demographic Inference: DaDi
Models of demographic history (population sizes, migration rates, and divergence times) inferred from genetic data complement archeology and serve as null models in genome scans for selection. Most current inference methods are computationally limited to considering simple models or non-recombining data. We introduce a method based on a diffusion approximation to the joint frequency spectrum of genetic variation between populations. Our implementation, DaDi, can model up to three interacting populations and scales well to genome-wide data. We have applied DaDi to human data from Africa, Europe, and East Asia, building the most complex statistically well-characterized model of human migration out of Africa to date
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