231 research outputs found
1937. Excursió a Torrelles. Grup de dinou noies
No full textExcursió a Torrelles. A l'esquerra de la primera fila, Amàlia Casals (germana de Joana Casals). A la segona fila, d'esquerra a dreta, Conxa Guarro, Dolors Oliveras, Anna Carrasco, Ramona Masvidal, Maria Cugueró i Ma. Teresa Boada. A la darrera fila, la segona des de l'esquerra és Helena Blanco; a la seva esquerra, Maria SerrallachAnotació manuscrita al verso: "Abril, 1937. Excursió a Torrelles"
1937. Excursió a Torrelles. Grup de dinou noies
No full textExcursió a Torrelles. A l'esquerra de la primera fila, Amàlia Casals (germana de Joana Casals). A la segona fila, d'esquerra a dreta, Conxa Guarro, Dolors Oliveras, Anna Carrasco, Ramona Masvidal, Maria Cugueró i Ma. Teresa Boada. A la darrera fila, la segona des de l'esquerra és Helena Blanco; a la seva esquerra, Maria SerrallachAnotació manuscrita al verso: "Abril, 1937. Excursió a Torrelles"
Les Dous de Torrelles de Foix; riera de Pontons
No full textBoItinerari: Sant Martí Sarroca (341 m.) - Fonts de les Dous de Torrelles de Foix - Ermita de Foix (420 m.) - Església vella de Foix (645 m.) - Pontons (632 m.) - Ermita de Sant Joan de la Muntanya - Ponton
Surface and interface structure of Nd1.2Ba1.8Cu3Oy epitaxial films studied by grazing incidence X-ray diffraction
No full textTorrelles de Foix - 50 cts. : l'Ajuntament de Torrelles de Foix reconeix a favor del portador la quantitat de cinquanta cts. : Torrelles de Foix, juny 1937
No full textSegons un dibuix de l'artista Lluís Pallarès, a l'anvers, presidit per l'escut local, s'hi veu unes espigues de blat i una branca d'olivera i a l'angle inferior dret un plat i una gerra. El revers està completament ocupat pel dibuix d'una font de molt brocs. Color verd fosc sobre verd clar ; emès el 1937 ; tiratge de 4.000 exemplars ; série A ; núm. 103 ; Núm. del catàleg Turró: 2.971 ; Índex de raresa: Corren
Looking underneath fullerenes on Au(110): Formation of dimples in the substrate
No full textThe adsorption of organic molecules on metal surfaces can lead to complex nanostructuration of the supporting substrate. The precise atomistic and electronic structures of the C60/Au(110) interface are unveiled by combining synchrotron-based diffraction and spectroscopic techniques with density functional theory calculations. We show that the interaction between C60 molecules with Au(110) surface induces a massive interface reorganization, which leads to the Au(110)-p(6 x 5) substrate reconstruction and to the formation of surface nanodimples. The fullerenes are hosted by these nanodimples, which are one and two layers deep. We provide evidence that the larger contact area between the C60 and the metal, which results from the substrate rearrangement, allows for the formation of strong directional C-Au bonds
Structural study of decrespignyite-(Y), a complex yttrium rare earth copper carbonate chloride, by three-dimensional electron and synchrotron powder diffraction
No full textThe crystal structure of the mineral decrespignyite-(Y) from the Paratoo copper mine (South Australia) has been obtained by applying d recycling direct methods to 3D electron diffraction (ED) data followed by Rietveld refinements of synchrotron data. The unit cell is a = 8.5462(2), c = 22.731(2) Å and V = 1437.8(2) Å3, and the chemical formula for Z = 1 is (Y10.35REE1.43Ca0.52Cu5.31 σ17.61(CO3)14Cl2.21(OH)16.79• 18.35H2O (REE. rare earth elements). The ED data are compatible with the trigonal P 3m1 space group (no. 164) used for the structure solution (due to the disorder affecting part of the structure, the possibility of a monoclinic unit cell cannot completely be ruled out). The structure shows metal layers perpendicular to [001], with six independent positions for Y, REE and Cu (sites M1 to M4 are full, and sites M5 and M6 are partially vacant), and two other sites, Cu1 and Cu2, partially occupied by Cu. One characteristic of decrespignyite is the existence of hexanuclear (octahedral) oxo-hydroxo yttrium clusters [Y6(μ6-O)(μ3-OH)8O24] (site M1) with the 24 bridging O atoms belonging to two sets of symmetry-independent.CO3/2- ions, with the first set (2×) along a ternary axis giving rise to a layer of hexanuclear clusters and the second set (6×) tilted and connecting the hexanuclear clusters with hetero-tetranuclear ones hosting Cu, Y and REE (M2 and M3 sites). The rest of the crystal structure consists of two consecutive M3 C M4 layers containing the partially occupied M5, M6, and Cu2 sites and additional carbonate anions in between. The resulting structure model is compatible with the chemical analysis of the type material which is poorer in Cu and richer in (REE, Y) than the above-described material
A novel model for the (R3xR3)-R30 alkanethiolate-Au(111) phase based on alkanethiolate-Au adatom complexes
No full textSelf-assembled monolayers of thiols on Au(111) have attracted considerable interest from the theoretical and experimental points of view as model systems for understanding the organization of molecules on metallic surfaces, and also as key elements in nanoscience and nanotechnology. Today, there is strong theoretical and experimental evidence indicating that the surface chemistry of these monolayers at high coverage involves dithiolate–adatom (RS–Auad–SR) species, showing the existence of the (3 × 4) and c(4 × 2) lattices usually observed by scanning tunneling microscopy. However, concealing the existence of dithiolate–Au adatom species with the presence of the paradigmatic (√3 × √3)R30° lattice, which dominates the structure of long alkanethiols, still remains a challenge. Here, we propose a novel (3√3 × 3√3)R30° structural model containing RS–Auad–SR moieties based on DFT calculations which reconciles most of the experimental data observed for the (√3 × √3)R30° lattice. Our results provide a unified picture of the surface chemistry of the thiol–Au(111) system.Fil: Carro, P.. Universidad de la Laguna; EspañaFil: Torrelles, X.. Consejo Superior de Investigaciones Cientificas. Institut de Ciència de Materials de Barcelona ICMAB; EspañaFil: Salvarezza, Roberto Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentina. Universidad Nacional de la Plata; Argentin
El Castell Vell de la Marca, Torrelles de Foix i la urbanització Can Coral, des de Foix
No full textBoItinerari: Sant Martí Sarroca (341 m.) - Fonts de les Dous de Torrelles de Foix - Ermita de Foix (420 m.) - Església vella de Foix (645 m.) - Pontons (632 m.) - Ermita de Sant Joan de la Muntanya - Ponton
Ti- and Sr-rich surfaces of SrTiO3 studied by grazing incidence x-ray diffraction
No full textThe structure of SrTiO3 (100) (STO) single crystal surfaces has been investigated by grazing incidence x-ray diffraction. The authors found that chemically etched STO is composed similar to 75% of an ideal TiO2 surface layer and similar to 25% of SrO and it is very stable when annealed in ultrahigh vacuum or in O-2 at high temperatures. A monolayer of SrO, epitaxially grown by pulsed laser deposition, is found to cover only a fraction of the TiO2 layers and exhibits a 2x2 reconstruction with strong structural changes after annealing in conditions typically used for the deposition of oxides. (c) 2007 American Institute of Physics
- …
