Search results for "Visual"

From Single Molecules to Nanoscopically Structured Materials: Self-Assembly of Metal Chalcogenide/Metal Oxide Nanostructures Based on the Degree of P…

2011

A chemically specific and facile method for the immobilization of metal oxide nanoparticles onto the surface of IF-MoS2 nested fullerenes is reported. The modification strategy is based on the chalcophilic affinity of transition metals such as Fe2+/Fe3+, Fe3+, or Zn2+ as described by the Pearson HSAB concept. The binding capabilities of the 3d metals are dictated by their Pearson hardness. Pearson hard cations such as Fe3+ (Fe2O3) do not bind to the chalcogenide surfaces; borderline metals such as Fe2+ (Fe3O4) or Zn2+ (ZnO) bind reversibly. Pearson-soft metals like Au bind irreversibly. The immobilization of metal oxide nanoparticle colloids was monitored by transmission electron microscopy…

Formation of nanosized strontium substituted hydroxyapatites

2012

Incorporation of specific elements into calcium phosphates offers the combination of a bioactive material and a therapeutic effect. This is important for improving the integration of implants as well as treating medical conditions. Strontium is a suitable candidate and displays the ability to stimulate bone growth and reducing bone resorption. This study investigated the formation of strontium carbonated hydroxyapatite nanoparticles from an amorphous phase. Crystallization of carbonated hydroxyapatite occurred at 585 o C, but samples with an intended 25% and 75% replacement of calcium with strontium crystallized at 624 o C. Heat treatment at the crystallization temperature revealed that str…

Hydrothermally Synthesized Strontium Peroxyapatite

2015

The current research focuses on peroxide ion incorporation in the structure of strontium hydroxyapatite (SrHAp) by exposure to H2O2 ina closed hydrothermal vessel under mild conditions at 130 to 170 °C. Peroxide enriched strontium apatite (SrPerAp) was characterized for structure by X-Ray diffraction, for peroxide content- by permanganometric titration and then viewed by SEM. This study continued from previous work that used 30%H2O2 and showed a higher included peroxide content after processing with 50% H2O2 at 130 °C 70% of the theoretical peroxide content in apatitic channels of strontium apatite. This is the highest peroxide content incorporated to date and employs a lower temperature th…

Protected but Accessible: Oxygen Activation by a Calixarene-Stabilized Undecagold Cluster

2013

DFT computations show that calixarenes stabilize subnanometer Au11 clusters allowing access of small molecules like O2 to reactive metal sites in the core. Maximum of three dioxygen molecules can bind to the cluster, and they are activated to a superoxo O2(-) state. This study predicts that gold clusters could act as viable oxidation catalysts at ambient conditions based on similar principles as the metal centers in enzymes.

Diastereomeric control of enantioselectivity: evidence for metal cluster catalysis

2014

Enantioselective hydrogenation of tiglic acid effected by diastereomers of the general formula [(μ-H)2Ru3(μ3-S)(CO)7(μ-P–P*)] (P–P* = chiral Walphos diphosphine ligand) strongly supports catalysis by intact Ru3 clusters. A catalytic mechanism involving Ru3 clusters has been established by DFT calculations. peerReviewed

On Using Decision Maker Preferences with ParEGO

2017

In this paper, an interactive version of the ParEGO algorithm is introduced for identifying most preferred solutions for computationally expensive multiobjective optimization problems. It enables a decision maker to guide the search with her preferences and change them in case new insight is gained about the feasibility of the preferences. At each interaction, the decision maker is shown a subset of non-dominated solutions and she is assumed to provide her preferences in the form of preferred ranges for each objective. Internally, the algorithm samples reference points within the hyperbox defined by the preferred ranges in the objective space and uses a DACE model to approximate an achievem…

Le paysage médial et la facture de l’œuvre : Livre, impression, illustration

2023

« Gold in the city? Symons’s London, a Book of Aspects (1909) »

2014

Marginalisé dans les études symonsiennes, London: A Book of Aspects (1909) se présente comme un récit de voyage doublé d’une réflexion sur la « mêlée des arts ». Le poète de London Nights et de Silhouettes ne vise nullement le réalisme journalistique mais élabore un récit feuilleté où l’art de la danse et de la peinture se mêlent à une réflexion plus large sur l’écriture, l’identité et la mémoire. Une version jamais publiée se doublait de photogravures d’Alvin Langdon Coburn inscrivant en outre la rencontre de l’image et du texte. Cette alchimie poétique produit, sinon de l’or, du moins une vision dorée de la ville mais se conclut sur une note plus sombre lorsque Symons explore l’East End. …

Sexualidad, política del cuerpo y función socioeducativa del cine en Touch Me Not (Adina Pintilie, 2018)

2020

Este artículo analiza la ópera prima de la cineasta Adina Pintilie, Touch Me Not (Nu mă atinge-mă, 2018), ganadora del Oso de Oro y del premio a la Mejor Ópera Prima en el Festival de cine de Berlín. En primer lugar, contextualizamos el texto fílmico, abordando su distanciamiento de la tradición del denominado “nuevo cine rumano” y su planteamiento estético híbrido, a medio camino entre el cine observacional y experimental. En segundo lugar, analizamos las tesis que el discurso fílmico plantea en su tematización de la sexualidad y el cuerpo. Para ello, nos servimos de la teorización freudiana de la sexualidad y la reflexión foucaultiana sobre el biopoder, siguiendo el planteamiento de Teres…

Psicothema

2016

Resumen tomado de la publicación ¿Cómo codifican los jugadores de Scrabble la posición de las letras durante la lectura? Antecedentes: en experimentos con lectores adultos, las pseudopalabras creadas por transposición de letras (v.g., CHOLOCATE) se confunden frecuentemente con su palabra base. Por ejemplo, en tareas de decisión léxica (“¿es el estímulo una palabra?”), los tiempos de respuesta son mayores y con mayor porcentaje de errores para CHOLOCATE que para su control ortográfico CHOTONATE (es decir, un efecto de transposición de letras). Método: en el presente experimento examinamos los procesos de codificación de la posición de las letras en individuos particularmente expertos en el p…