187,677 research outputs found
Grouping Forest Tree Species on the Sierra Madre Occidental, Mexico
No full textThe Sierra Madre Occidental in the Mexican State of Durango, is home to about five million ha of species-rich forest ecosystems. Many people live in or near these forests and depend on them for their livelihood. The preservation of the species richness of this unique resource requires improved understanding of individual species functioning, effective modeling and advanced methods of monitoring. Identifying similarities and differences between individual tree species is a key to achieving these aims. Accordingly, the purpose of this study is to define species cohorts based on Durango's extensive network of permanent observational studies. We review different approaches of simplifying speciesrich forest communities. A simple height-growth ordenation, that had been used in several previous studies, provided the motivation for an improved new method of species grouping. The new approach is based on the differentiation between canopy species and permanent subcanopy species. The canopy group is further subdivided into mature and immature individuals using the relationship between diameters and heights within a bivariate mixed normal distribution. The main contribution of this work is the specific approach of vertical stratification based on height/diameter ratios and bivariate clusters. This, to our knowledge, is new and potentially important for developing more advanced methods of harvest control in the forests of the Sierra Madre Occidental, and perhaps also in other multi-species forests that are subject to management
Enhanced light extraction from emitters close to clusters of resonant plasmonic nanoantennas
No full textWe perform time-resolved fluorescence spectroscopy on clusters of plasmonic nanoantennas covered with a dye–polymer mixture. Dimer antenna structures were fabricated consisting of two interacting gold nanorods with varying lengths and interparticle separation. By combining four individual antennas into a cluster within a diffraction limited spot size, we can couple out half of the dye molecule fluorescence via antenna plasmons. Two-dimensional confocal fluorescence lifetime scans visualize the spontaneous emission enhancement of the molecular fluorescence around the antenna clusters
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Drawing the Line: How African, Caribbean and White British Women Live Out Psychologically Abusive Experiences
No full textThe final, definitive version of this paper has been published in Violence Against Women, 19 (9):1104-32, Sept 2013 by SAGE Publications Ltd, All rights reserved. © The Author(s) 2013.
The online version of this article can be found at: http://vaw.sagepub.com/content/19/9/110
A Tripartite Post-Recession Rebalancing
No full textIn this latest Advance & Rutgers Report, entitled “A Tripartite Post-Recession Rebalancing,” Dean James W. Hughes and Professor Joseph J. Seneca deliver an incisive assessment of the current market conditions and obstacles in the path of our economic recovery. They offer a statistical cautionary tale that the private and public sector need to hear and acknowledge in order for the economy to make continued progress.This report was published as Issue Paper Number 7, November 2011, in Advance & Rutgers Report
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Density and Production in the Natural Forests of Durango/Mexico
No full textMulti-species natural forests, representing more than 90 percent of the total forest area of the world, are a huge resource which can deliver many products and se-vices, in addition to timber. Prominent examples of such natural ecosystems are the communal forests on the Mexican Sierra Madre Occidental, covering approximately 14 million ha. Based on evidence gathered in long-term observational studies in Durango (Mexico), this study presents estimates of forest production in response to specific residual levels of forest density. These estimates permit an evaluation of production losses due to reduced stocking levels in the municipios: Santiago Papasquiaro, San Dimas and Pueblo Nuevo. The available observations show a linear response of forest production to forest density in the communal forests on the Mexican Sierra Madre Occidental, irrespective of site quality, species mixing effects and other variables. Potential production gains are illustrated for the Ejido San Diego de Tezains where detailed compartment data are available. The results regarding potential production gains provide a new basis for improved control of residual forest structures in the natural forests of the Sierra Madre Occidental. However, further studies are needed regarding the response to species diversity and mixing effects as well as specific site variables, as soon as such observations are available.Mexican Comision Nacional Forestal (CONAFOR
Density and Production in the Natural Forests of Durango/Mexico
No full textMulti-species natural forests, representing more than 90 percent of the total forest area of the world, are a huge resource which can deliver many products and se-vices, in addition to timber. Prominent examples of such natural ecosystems are the communal forests on the Mexican Sierra Madre Occidental, covering approximately 14 million ha. Based on evidence gathered in long-term observational studies in Durango (Mexico), this study presents estimates of forest production in response to specific residual levels of forest density. These estimates permit an evaluation of production losses due to reduced stocking levels in the municipios: Santiago Papasquiaro, San Dimas and Pueblo Nuevo. The available observations show a linear response of forest production to forest density in the communal forests on the Mexican Sierra Madre Occidental, irrespective of site quality, species mixing effects and other variables. Potential production gains are illustrated for the Ejido San Diego de Tezains where detailed compartment data are available. The results regarding potential production gains provide a new basis for improved control of residual forest structures in the natural forests of the Sierra Madre Occidental. However, further studies are needed regarding the response to species diversity and mixing effects as well as specific site variables, as soon as such observations are available.Mexican Comision Nacional Forestal (CONAFOR
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