2,876 research outputs found
AN ENERGY STRATEGY BASED ON ENERGY DEDICATED CROPS OR CORN: DIFFERENTIAL ECONOMIC AND REGIONAL IMPACTS
The growth of the role of agriculture as a source of energy feedstock has been primarily concentrated on increasing corn use for ethanol. Alternatively, refocusing this growth in the utilization of dedicated energy crops could prove more advantageous as producers of more crops in a wider geographic area could benefit.Resource /Energy Economics and Policy,
Nutritional care for the prevention of mineral deficiency in elite athletes
Trabajo fin de grado en EnfermeríaEl déficit de minerales es un problema de habitual aparición entre los deportistas de élite cuyo abordaje parte desde un enfoque meramente nutricional para evitar las importantes consecuencias que tal situación genera en el rendimiento del atleta. El objetivo del presente trabajo es analizar las necesidades de hierro, calcio, magnesio y zinc en las personas que practican deporte de alto nivel y el papel que la enfermera desempeña en la transmisión de recomendaciones nutricionales y ayudas ergogénicas que puedan prevenir y/o tratar dicho déficit. Se ha realizado una revisión narrativa consultando las bases de datos: Pubmed, Redalyc y Cinahl; así como la biblioteca electrónica Scielo y el buscador Google Académico. Como resultado, se ha confirmado la influencia de los minerales estudiados en el rendimiento atlético y el consecuente elevado consumo de suplementos alimentarios por quienes son deficitarios de alguno de ellos. Este consumo se da, en la mayoría de los casos, sin supervisión profesional, pese a la evidencia existente acerca de la mejora en el rendimiento que genera la educación nutricional.Mineral deficiency is a common condition within elite athletes which approach needs to be merely nutritional to prevent the important consequences that a deficiency may bring to the athlete´s performance. The aim of this paper is to analyse the need of iron, calcium, magnesium and zinc in people who practice high performance sports and the nurse´s role in the transmission of nutritional recommendations and ergogenic aids that can prevent or treat that deficiency. The databases reviewed were Pubmed, Redalyc and Cinahl; also, the electronic library Scielo and the searcher Google Scholar. As a result, it is possible to confirm the influence of the researched minerals over the athlete´s performance and therefore the high dietary supplement consumption from those who lack any mineral. This consumption mainly happens without any professional supervision, despite the evidence showing performance improvements under nutritional education
Gauge theory in dimension
We first review the notion of a -manifold, defined in terms of a
principal ("gauge") bundle over a -dimensional manifold, before
discussing their relation to supergravity. In a second thread, we focus on
associative submanifolds and present their deformation theory. In particular,
we elaborate on a deformation problem with coassociative boundary condition.
Its space of infinitesimal deformations can be identified with the solution
space of an elliptic equation whose index is given by a topological formula.Comment: 15 page
Sixty Billion Gallons by 2030: Economic and Agricultural Impacts of Ethanol and Biodiesel Expansion
Agriculture is well positioned as a feedstock source because the fuels can be utilized with current engine technologies and are compatible with the current distribution infrastructure. Commercialization of cellulosic to ethanol technology will enable fuels to be derived from a diverse portfolio of feedstocks from numerous regions of the country. The levels of ethanol production analyzed are 10, 30, and 60 billion gallons of ethanol annually by 2010, 2020 and 2030, respectively. Impacts of producing 1 billion gallons of biodiesel production by 2012 and 1.6 billion gallons by 2030 are also projected. Overall, for the period 2007 to 2030, the estimated accumulated gains in net farm income are over 150 billion. Due to the geographic decentralization of the production of feedstock, economic gains are projected to accrue to the majority of regions of the country. Significant expansion beyond 60 billion gallons per year would likely require expansion of the region suitable for the production of bioenergy crops, ability to convert other pastureland (beyond cropland in pasture) into energy crops; allowing CRP acreage to be used in feedstock production, increasing short-rotation wood crops in the Northeast and Northwest regions, increased yields above those assumed in the analysis, and/or increasing the efficiency of cellulosic conversion. Further research should examine the agricultural, environmental, and economic impacts of one or more these factors changing.Resource /Energy Economics and Policy,
The GRB 030328 host: another case of a blue starburst galaxy
We present for the first time the detection of the GRB 030328 host galaxy in
four optical bands equivalent to UBRI. The host galaxy spectral energy
distribution is consistent with a low extinction (E(B-V) < 0.21) starburst
galaxy. The restframe B-band magnitude of the host is M_B ~ -20.4Comment: 4 pages, 2 figures, accepted for publication in Il nuovo cimento (4th
Workshop Gamma-Ray Bursts in the Afterglow Era, Rome, 18-22 October 2004
Supersymmetry and Polytopes
We make an imaginative comparison between the Minimal Supersymmetric Standard
Model and the 24-cell polytope in four dimensions, the Octacube.Comment: Presented to the Workshop on Geometry and Physics: Supersymmetry.
Bilbao, Spain. May 200
SOCIAL WELFARE AND ENVIRONMENTAL DEGRADATION IN AGRICULTURE: THE CASE OF ECUADOR
A non-linear optimization model which maximizes total Ecuadorian social welfare, defined as the sum of consumers' and producers' surpluses for the four major crops (corn, bananas, rice and African palm) is developed to evaluate the tradeoff between welfare and environmental degradation in Ecuador. It was found that a total welfare loss of US 1.112 billion to US$ 989.66 million) would be expected from a 30 percent reduction in the total pesticide load on the environment in the production of the four major crops. The distributional impacts of the welfare loss were found, however, to be significantly skewed toward the loss of consumers' surplus. Specifically, a 30 percent reduction of total pesticide load on the environment would result in a reduction of 3.86 percent of producers' total surplus while consumers would be expected to loose 19.46 percent of their total surplus.welfare tradeoff, environmental impacts, non-linear optimization, Environmental Economics and Policy,
A young stellar environment for the superluminous supernova PTF12dam
The progenitors of super luminous supernovae (SLSNe) are still a mystery.
Hydrogen-poor SLSN hosts are often highly star-forming dwarf galaxies and the
majority belongs to the class of extreme emission line galaxies hosting young
and highly star-forming stellar populations. Here we present a resolved
long-slit study of the host of the hydrogen-poor SLSN PTF12dam probing the kpc
environment of the SN site to determine the age of the progenitor. The galaxy
is a "tadpole" with uniform properties and the SN occurred in a star-forming
region in the head of the tadpole. The galaxy experienced a recent star-burst
superimposed on an underlying old stellar population. We measure a very young
stellar population at the SN site with an age of ~3 Myr and a metallicity of
12+log(O/H)=8.0 at the SN site but do not observe any WR features. The
progenitor of PTF12dam must have been a massive star of at least 60 M_solar and
one of the first stars exploding as a SN in this extremely young starburst.Comment: submitted to MNRAS letters. 5 pages, 3 figures, supplementary
material: 2 figures, 2 table
POTENTIAL FARM-LEVEL IMPACTS OF PROPOSED FQPA IMPLEMENTATION: THE TENNESSEE CASE
This research estimates farm-level impacts of a potential ban on organophosphates and carbamates under the FQPA. Insecticide expenditure and first- and fifth-year yield impacts are estimated for five Tennessee representative farms. Results indicate that within five years, the ban could reduce net farm income on Tennessee farms by 16 to 46 percent.FQPA, organophosphates, carbamates, insecticides, farm-level analysis, Agricultural and Food Policy, Environmental Economics and Policy,
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