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Institution

University of Costa Rica

EducationSan José, Costa Rica
About: University of Costa Rica is a education organization based out in San José, Costa Rica. It is known for research contribution in the topics: Population & Venom. The organization has 9817 authors who have published 16781 publications receiving 238208 citations. The organization is also known as: UCR & Universidad de Costa Rica.
Topics: Population, Venom, Antivenom, Snake venom, Myotoxin


Papers
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Journal ArticleDOI
TL;DR: In this article, a PG 64-22 neat binder was modified with several additives to determine the effect on adhesion: polymers, nanomaterials, and adhesion promoters.
Abstract: The interaction between asphalt binder and aggregate is fundamental to ensure adequate performance of asphalt mixtures, mainly in the presence of water. The work of adhesion generated between both materials directly affects the resistance of asphalt mixture to moisture damage, because it measures the ease with which water can displace asphalt binder from the aggregate surface. The objective of this study was to characterize the bond strength between asphalt and several aggregate sources. A PG 64-22 neat binder was modified with several additives to determine the effect on adhesion: polymers, nanomaterials, and adhesion promoters. To measure the strength of adhesion, the bitumen bond strength (BBS) test and contact angle measurements between asphalt binder and the aggregate surface by means of goniometry were used. The surface energy of the asphalt and the aggregate, with and without the presence of water, was estimated also. Testing was performed on all binders and on each binder–aggregate combination aft...

74 citations

Journal ArticleDOI
TL;DR: GAC treatment of drinking or reclaimed waters with appreciable levels of bromide and dissolved organic nitrogen may not control the formation of unregulated DBPs with higher genotoxicity potencies.
Abstract: Certain unregulated disinfection byproducts (DBPs) are more of a health concern than regulated DBPs. Brominated species are typically more cytotoxic and genotoxic than their chlorinated analogs. The impact of granular activated carbon (GAC) on controlling the formation of regulated and selected unregulated DBPs following chlorine disinfection was evaluated. The predicted cyto- and genotoxicity of DBPs was calculated using published potencies based on the comet assay for Chinese hamster ovary cells (assesses the level of DNA strand breaks). Additionally, genotoxicity was measured using the SOS-Chromotest (detects DNA-damaging agents). The class sum concentrations of trihalomethanes, haloacetic acids, and unregulated DBPs, and the SOS genotoxicity followed the breakthrough of dissolved organic carbon (DOC), however the formation of brominated species did not. The bromide/DOC ratio was higher than the influent through much of the breakthrough curve (GAC does not remove bromide), which resulted in elevated br...

74 citations

Journal ArticleDOI
TL;DR: The NERC project as discussed by the authors proposed a novel approach to link volcanic gases and magmatic volatiles within a physical model, which was shown to be effective in linking the two gases and volatile within the same physical model.
Abstract: NERC project “Magma dynamics at persistently degassing basaltic volcanoes: A novel approach to linking volcanic gases and magmatic volatiles within a physical model” (NE/F004222/1 and NE/F005342/1).

74 citations

Journal ArticleDOI
TL;DR: In this article, a Hamiltonian framework for fermion quantum fields over non-commutative manifolds is introduced, based on the relation between Fredholm modules and the Segal-Shale-Stinespring version of canonical quantization.
Abstract: By exploiting the relation between Fredholm modules and the Segal–Shale–Stinespring version of canonical quantization, and taking as starting point the first-quantized fields described by Connes' axioms for noncommutative spin geometries, a Hamiltonian framework for fermion quantum fields over noncommutative manifolds is introduced. We analyze the ultraviolet behavior of second-quantized fields over noncommutative three-tori, and discuss what behavior should be expected on other noncommutative spin manifolds.

74 citations

Journal ArticleDOI
TL;DR: In this article, the authors used a Mellin integral transform formalism to derive a closed expression for the Einasto surface density and related properties in terms of the Fox H and Meijer G functions, which can be written as series expansions.
Abstract: Recent high-resolution N-body CDM simulations indicate that nonsingular three-parameter models such as the Einasto profile perform better than the singular two-parameter models, e.g. the Navarro, Frenk and White, in fitting a wide range of dark matter haloes. While many of the basic properties of the Einasto profile have been discussed in previous studies, a number of analytical properties are still not investigated. In particular, a general analytical formula for the surface density, an important quantity that defines the lensing properties of a dark matter halo, is still lacking to date. To this aim, we used a Mellin integral transform formalism to derive a closed expression for the Einasto surface density and related properties in terms of the Fox H and Meijer G functions, which can be written as series expansions. This enables arbitrary-precision calculations of the surface density and the lensing properties of realistic dark matter halo models. Furthermore, we compared the Sersic and Einasto surface mass densities and found differences between them, which implies that the lensing properties for both profiles differ.

73 citations


Authors

Showing all 9922 results

NameH-indexPapersCitations
Alberto Ascherio13646269578
Gervasio Gomez133184499695
Myron M. Levine12378960865
Hong-Cai Zhou11448966320
Edward O. Wilson10140689994
Mary Claire King10033647454
Olga Martín-Belloso8638423428
José María Gutiérrez8460726779
Cesare Montecucco8438227738
Rodolphe Clérac7850622604
Kim R. Dunbar7447020262
Paul J. Hanson7025119504
Hannia Campos6921015164
Jean-Pierre Gorvel6723115005
F. Albert Cotton66102327647
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202325
2022155
2021864
20201,009
2019894
2018834