5,469 research outputs found
Le mythe de Hyacinthos dans la littérature ancienne
Sin resumenSin resume
Towards the development of the supply chain of concentrated solar power
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
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 AlmerÃa. Se constata una alta riqueza florÃstica con una estratificación algal en cinco niveles asà como la existencia de una dominancia neta de las algas mediolitorales e infralitorales fotófilas sobre otros grupos ecológicos, un elevado grado de equitabilidad especÃfica 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 AlmerÃa (S.L. of Spain)
Soro. J. & CONDE. F. 1989. Catálogo tiorÃstico de las algas betónicas marinas en el litoral de AlmerÃa (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 Medà 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 AlmerÃa 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
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
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
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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