5,469 research outputs found

    Introduction

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    Le mythe de Hyacinthos dans la littérature ancienne

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    Conclusions

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    Le sanctuaire de l’Amyclaion

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    Towards the development of the supply chain of concentrated solar power

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    This work focuses on the investigation into the planning of renewable energy power plants in Brazil using the Concentrated Solar Power (CSP) technology. The main aim of the paper is to present an analysis of the planning process that can be used as a basis of the development of a method to assess the Brazilian’s local manufacturing and supply chain capabilities in supporting the deployment of the CSP technology. The paper identifies areas in which the concerted efforts should be emphasized. For this, the paper will first discuss the key components of the chosen CSP technology (in this case the parabolic through). The manufacturing processes of these components will subsequently be analyzed and the key enabling technologies will be determined. The demands of electricity will be estimated using the System Advisory Model®, a modelling tool developed by the National Renewable Energy Laboratory (NREL). An assessment method will finally be proposed to identify the potentials of the local Brazilian supply chain, through the readiness evaluation of the key enabling technologies and manufacturing processes

    Aproximación a la vegetación algal dominada por "Laurencia papillosa" (C. Agardh) Greville, en la zona mediolitoral del sureste de España

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    Aproximación a la vegetación algal dominada por Laurencia papillosa (C. Agardh) Greville, en la zona mediolitoral del Sureste de España. Se estudia la comunidad de la zona mediolitoral inferior constituida por Laurencia papillosa (C. Agardh) Greville en base a 21 inventarios realizados durante un ciclo anual en las costas de Murcia y Almería. Se constata una alta riqueza florística con una estratificación algal en cinco niveles así como la existencia de una dominancia neta de las algas mediolitorales e infralitorales fotófilas sobre otros grupos ecológicos, un elevado grado de equitabilidad específica y una estacionalidad netamente marcada. Finalmente se postulan argumentos que individualizan esta comunidad de otras de la zona mediolitoral inferior del Mediterráneo Occidental

    A calalogue mi benthic marine algae of Almería (S.L. of Spain)

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    Soro. J. & CONDE. F. 1989. Catálogo tiorístico de las algas betónicas marinas en el litoral de Almería (Sureste de España). Bol, Comp/u/en sU 15: 61-83. En este trabajo se da una lista de 325 táxones de algas bentónicas marinas del litoral de Almeria. aportándose 138 nuevas citas de las que 12 son nuevas para el litoral ibérico: Audouine/la subpinnata. Lithophy//um incrustans f. depressa, L. incrustans E ilabe/lata, Po/ystrata compacta. Nithophyllum fiabellatum. Lophoc/adia Ial/emandii, Po/ysiphonia atra. Feldmannia padinae, Glifordia ovata. Streb/onema sti/ophorae. Ochlocha etc histrix y Chaetosiphon molin~/brmis y una no habla sido citada en el Medí ter-Aneo español: Symphyocarpus strangu/au.vSoio. J. & CONOE. F. 1989. A catalogue on benthic marine algae of Almeria <5. E. of Spain). Bo!. (omplutensis 15: 61--83 (i n Spanish). The number of taxa of algae in Almería coasts are 325. 12 of them, are new records for Iberian Peninsula coasts: Audouinella subpinnata, Lithophyl/um incrus/ans f. depressa, L. incrus¡uns f.flabe//ata. Polystrata compactes, Nithophy/lumflabellatum, Lophocladia la//em andiL Polysiphonia atra, Feldmannia padinaé Glifordia o rata, Streb/onema sti/ophoraé; Ochlochaete histrix y Chaetosiphon mo/iniformis. Symphyocarpus strangulans is a new record for Spanish Mediterranean coast

    The Crystal and Molecular Structure of 4-Formylimidazoline-2-thione

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    The title compound is monoclinic, space group P2 Jc, with a = 4.020 (4), b = 21.491(3), c = 7-410 (4) ,4,, fl = 124.1 (5) °, Z = 4. The structure was solved by Patterson-function and heavy-atom methods from diffractometer X-ray data. The final R value is 0.040. All the atoms lie approximately on the least-squares plane of the imidazoline ring. The molecules related by the glide plane are linked by N-H... O hydrogen bonds (2.840 ,~) to form a chain along e. The chains are held together by N-H... S hydrogen bonds (3.260 A) between the molecules related by an inversion centre

    Structure and Molecular Conformation of l-(4-Acetyl-5-methyl-2-furyl)- 1,3-dideoxy-3-nitro-fl-D-xylopyranose

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    The crystal structure of C I2HIsNO7 has been determined at room temperature. Crystals are tetragonal, space group P432~2, Z = 8, with a -- 12.039 (1), c = 17.979 (4)A. 1304 observed reflexions contributed to the full-matrix least-squares refinement to give R -- 0.075. The pyranose ring displays a slightly distorted chair with 4C~ conformation and all the substituents (furanose ring, NO 2 and OH groups) are equatorial. The reported configuration can be considered as the absolute configuration from the absence of epimerization at the anomeric atom. The packing of the structure can be described by a three-dimensional hydrogen-bonding scheme

    The Conformation and Crystal Structure of meso-2,10-Dimethyl- 3,1 l-dimethoxycarbonyl- 1,6,9,13-tetraoxadispiro[4.2.4.2]tetradeca-2,10-diene

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    The crystal and molecular structure of the title compound, C16H20Os, has been determined by singlecrystal X-ray diffraction. The compound crystallizes in the monoclinic space group P2t/c with two molecules in a cell of dimensions a = 9.199 (1), b = 12.423 (1), c = 8.047 (1) A, and fl = 114.87 (1) °. The structure was solved by direct methods (MULTAN). Full-matrix least-squares refinement gave a final agreement index of R = 0.054 for 1166 observed reflections. The sixmembered ring adopts the chair conformation around a symmetry centre. The conformation of the fivemembered rings is nearer to a twist than to an envelope, the approximate twofold axis passing through the C(4) atom. The endocyclic C-O bonds are asymmetric and the C=C distance is longer than expected for a double bond. Crystal packing is due to van der Waals interactions only
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