AMBIGUITIES IN ADSORBATE SITE ASSIGNMENT FROM VIBRATIONAL FREQUENCIES - A TLEED STRUCTURAL STUDY OF (2X1)CO-PD(110)

The structure of the (2 X 1)CO-Pd(110) surface phase has been determined by LEED intensity analysis. The CO molecule is found to be adsorbed in an atop site, tilted by 11-degrees +/- 4-degrees with respect to the surface normal, with a C-O bond length of 1.16 +/- 0.04 angstrom. Interestingly, the C-O vibrational frequency for this system (2003 cm-1) is virtually identical to the frequency observed for the (2 X 1)CO-Ni(110) surface phase (1998 cm-1) which a previous LEED study has shown involves bridge bound CO molecules. The result indicates that care must be taken in assigning site symmetries on the basis of C-O stretching frequencies alone.

A LEED STRUCTURAL STUDY OF THE CO INDUCED RECONSTRUCTION OF PD(110) - EVIDENCE FOR A MISSING ROW STRUCTURE

Molecularly adsorbed CO on Pd{110} has been shown (R. Raval et al., Chem. Phys. Lett. 167 (1990) 391, ref. [1]) to induce a substantial reconstruction of the surface in the coverage range 0.3 <theta less-than-or-equal-to 0.75. Throughout this coverage range, the adsorbate-covered reconstructed surface exhibits a (4 x 2) LEED pattern. However, the exact nature of the reconstruction remains uncertain. We have conducted a LEED I(E) "fingerprinting" analysis of the CO/Pd{110}-(4 x 2) structure in order to establish the type of reconstruction induced in the metal surface. This study shows that the LEED I(E) profiles of the integral order and appropriate half-order beams of the CO/Pd{110}-(4 x 2) pattern closely resemble the I(E) profiles theoretically calculated for a Pd{110}-(1 x 2) missing-row structure. Additionally, there is a strong resemblance to the experimental LEED I(E) profiles for the Cs/Pd{110}-(1 x 2) structure which has also been shown to exhibit the missing-row structure. On the basis of this evidence we conclude that the CO/Pd{110}-(4 x 2) LEED pattern arises from a missing-row reconstruction of the Pd{110} surface which gives rise to a strong underlying (1 x 2) pattern plus a poorly ordered CO overlayer which produces weak, diffuse fourth-order spots in the LEED pattern.

13-6-20, Croix Catelan, prix Blanchet, finale du 110 m haies : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59673

[Tommy] Thomson, gagnant [du] 110 m haies [des Jeux olympiques d'Anvers] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60601

[Tommy] Thomson, gagnant [du] 110 m haies [des Jeux olympiques d'Anvers] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60602

Anvers, 110 m haies [Jeux olympiques] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60603

[Tommy] Thomson, gagnant [du] 110 m haies signe des autographes [Jeux olympiques, 18/8/20] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60604

28-8-20, Colombes, un passage du 110 m haies : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60800

Resolución No. 110: Por la cual se decide un recurso de reposición y en subsidio de apelación

Servicios registrales

A marine actinomycete nocardiopsis mccb 110 as source of novel drugs to manage vibriosis

Aquaculture is a form of agriculture that involves the propagation, cultivation and marketing of aquatic plants and animals in a controlled environment (Swann, 1992). After growing steadily, particularly in the last four decades, aquaculture is for the first time set to contribute half of the fish consumed by the human population worldwide. Given the projected population growth over the next two decades, it is estimated that at least an additional 40 million tonnes of aquatic food will be required by 2030 to maintain the current per capita consumption (FAO, 2006). Capture fisheries and aquaculture supplied the world with about 110 million tonnes of food fish in 2006. Of this total, aquaculture accounted for 47 percent (FAO, 2009). Globally, penaeid shrimp culture ranks sixth in terms of quantity and second in terms of value amongst all taxonomic groups of aquatic animals cultivated (FAO, 2006). In places where warm-water aquaculture was possible black tiger shrimp, Penaeus monodon became the preferred variety of shrimp cultivar owing to its fast growth, seed availability and importantly due to high prices it fetches (Pechmanee, 1997). World shrimp production is dominated by P.monodon, which accounted for more than 50 % of the production in 1999 (FAO, 2000). In the last few years the whiteleg shrimp, Litopenaeus vannamei, has replaced P.monodon in many countries. Indian shrimp culture is dominated by P.monodon with the East Coast accounting for 70% of the production (Hein, 2002). Intensive culture, apart from other problems, results in enhanced susceptibility of the cultured species to diseases (Jory, 1997), which in fact have become the biggest constraint in shrimp aquaculture (FAO, 2003).

110 actividades para la clase de idiomas.

Incluye índice temático. Editado por Seth Lindstromberg y traducción española de Alejandro Valero

110 juegos de tiempo libre : para vacaciones escolares, acampadas, excursiones...

Recopilación de juegos procedente de diversas fuentes; apropiados para realizar en actividades de tiempo libre. En cada juego se especifica la edad adecuada y número de los participantes, habilidades que se pretende desarrollar, materiales necesarios; también, las reglas y desarrollo de cada actividad.