715 research outputs found
Renewable energy research progress in Mexico: a review
Mexico ranks 9th in the world in crude oil reserves, 4th in natural gas reserves in America and it is also highly rich in renewable energy sources (solar, wind, biomasss, hydropower and geothermal). However, the potential of this type of energy has not been fully exploited. Hydropower is the renewable energy source with the highest installed capacity within the country (11,603 MW), while geothermal power capacity (958 MW) makes Mexico to be ranked 4th in the use of this energy worldwide. Wind energy potential is concentrated in five different zones, mainly in the state of Oaxaca, and solar energy has a high potential due to Mexico's ideal location in the so called Solar Belt. Biomass energy has the highest potential (2635 to 3771 PJ/year) and has been the subject of the highest number of research publications in the country during the last 30 years (1982-2012). Universidad Nacional Autonoma de Mexico has led research publications in hydropower, wind, solar and biomass energy and Instituto de Investigaciones Electricas in geothermal energy during this period. According to the General Law for Climate Change the country has set the goal of generating 35% of its energy needs from renewable sources by 2024. This paper presents an overview of the renewable energy options available in Mexico, current status, main positive results to date and future potential. It also analyses barriers hindering improvements and proposes pertinent solutions. © 2014 The Authors
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Preparation of a porphyrinic bis(pyridyl aldehyde) and its supramolecular complexes.
Shape-specific molecular assemblies require the preparation of the constituent building blocks with the necessary properties to bias exclusive formation of the proposed structures. In this work, a novel linear porphyrin dialdehyde was synthesised and used to assemble a supramolecular grid via Cu(i) heteroleptic phenanthroline/pyridyl imine complexation, and a tetrahedral cage via Fe(ii) pyridyl imine coordination.We gratefully acknowledge funding from the Consejo Nacional de Ciencia y Tecnologia (CONACYT) Mexico (MAAG) and the Cambridge NanoDTC (CRG).This is the author accepted manuscript. The final version is available from the Royal Society of Chemistry via http://dx.doi.org/10.1039/C5CC06399
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Self-assembly of Fmoc-tetrapeptides based on the RGDS cell adhesion motif
Self-assembly in aqueous solution has been investigated for two Fmoc [Fmoc ¼ N-(fluorenyl)-9-methoxycarbonyl] tetrapeptides comprising the RGDS cell adhesion motif from fibronectin or the scrambled sequence GRDS. The hydrophobic Fmoc unit confers amphiphilicity on the molecules, and
introduces aromatic stacking interactions. Circular dichroism and FTIR spectroscopy show that the self-assembly of both peptides at low concentration is dominated by interactions among Fmoc units, although Fmoc-GRDS shows b-sheet features, at lower concentration than Fmoc-RGDS. Fibre X-ray diffraction indicates b-sheet formation by both peptides at sufficiently high concentration. Strong
alignment effects are revealed by linear dichroism experiments for Fmoc-GRDS. Cryo-TEM and smallangle
X-ray scattering (SAXS) reveal that both samples form fibrils with a diameter of approximately 10 nm. Both Fmoc-tetrapeptides form self-supporting hydrogels at sufficiently high concentration. Dynamic shear rheometry enabled measurements of the moduli for the Fmoc-GRDS hydrogel, however syneresis was observed for the Fmoc-RGDS hydrogel which was significantly less stable to shear. Molecular dynamics computer simulations were carried out considering parallel and antiparallel b-sheet configurations of systems containing 7 and 21 molecules of Fmoc-RGDS or Fmoc-GRDS, the results being analyzed in terms of both intermolecular structural parameters and energy contributions
TIC: A Stokes inversion code for scattering polarization with partial frequency redistribution and arbitrary magnetic fields
We present the Tenerife Inversion Code (TIC), which has been developed to
infer the magnetic and plasma properties of the solar chromosphere and
transition region via full-Stokes inversion of polarized spectral lines. The
code is based on the HanleRT forward engine, which takes into account many of
the physical mechanisms that are critical for a proper modeling of the Stokes
profiles of spectral lines originating in the tenuous and highly dynamic
plasmas of the chromosphere and transition region: quantum level population
imbalance and interference (atomic polarization), frequency coherence effects
in polarized resonance scattering (partial frequency redistribution), and the
impact of arbitrary magnetic fields on the atomic polarization and the
radiation field. We present first results of atmospheric and magnetic
inversions, and discuss future developments for the project.Comment: 17pages, 7 figures. Accepted for publication in The Astrophysical
Journa
Determination of parasite resistance status to anthelmintics through the larval development test.
The control of gastrointestinal nematodes of small ruminants has been carried out through intense and indiscriminate use of anthelmintics.Boletim de Indústria Animal, v. 74
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