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Support Interactions (support + interaction)
Selected AbstractsLiquid-Phase Hydrogenation of Unsaturated Aldehydes: Enhancing Selectivity of Multiwalled Carbon Nanotube-Supported Catalysts by Thermal ActivationCHEMCATCHEM, Issue 2 2010Bruno Abstract Platinum and iridium organometallic precursors are used to prepare nanosized, thermally stable multiwalled carbon nanotube-supported catalysts. The materials are characterized by N2 adsorption at 77,K, temperature-programmed desorption coupled with mass spectrometry, H2 chemisorption, transmission electron microscopy and thermogravimetric analysis; they are tested in the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol under mild conditions (363,K and 1,MPa). A thermal activation at 973,K is found to have a very positive effect over both activity and selectivity, leading to selectivities of approximately 70,%, at 50,% conversion, regardless of the active metal phase (Pt or Ir). Since no noticeable differences in the metal particle sizes are detected, the results are interpreted in light of an enhanced metal/support interaction. This effect, induced by the removal of oxygenated surface groups, is thought to change the adsorption mechanism of the cinnamaldehyde molecule. [source] Usability of playgrounds for children with different abilitiesOCCUPATIONAL THERAPY INTERNATIONAL, Issue 3 2007Maria Prellwitz Abstract The aim of the present study was to better understand how children with different abilities use playgrounds to engage in creative play and interact socially with their peers. Twenty children aged between 7 and 12 years, with different abilities, participated in interviews. The findings showed that playgrounds served as a reference point for all the children, they challenged a child's physical abilities and provided opportunities for role-playing and social interactions. However, for children with disabilities, playgrounds had limited accessibility, usability and did not support interaction with peers. A methodological limitation of the study was that the interviewer only met the children once. Further research should be carried out to investigate if creating playgrounds according to universal design principles and adapting them to the needs of children with disabilities would improve social interactions and provide more opportunities for play. Copyright © 2007 John Wiley & Sons, Ltd. [source] Photosensitization and the Photocurrent Switching Effect in Nanocrystalline Titanium Dioxide Functionalized with Iron(II) Complexes: A Comparative StudyCHEMISTRY - A EUROPEAN JOURNAL, Issue 20 2007Wojciech Macyk Dr. Abstract Selected iron(II) complexes (ferrocene, ferrocenylboronic acid, hexacyanoferrate(II)) have been used as photosensitizers of titanium dioxide. Various types of electronic interactions between the surface complex and the semiconducting support are reflected in different yields of photocurrent generated upon visible-light irradiation and different efficiencies of the photosensitization effect. The studied systems, showing the photocurrent switching upon changes of electrode potential and energy of photons (the PEPS effect), are good models of simple photoelectrochemical logic devices. The mechanism of photosensitization and photocurrent switching is discussed with respect to the type of surface-complex,support interaction. Quantum-mechanical calculations support the proposed mechanisms. Wybrane kompleksy ,elaza(II) (ferrocen, kwas ferrocenyloboronowy i heksacyjano,elazian(II)) zosta,y u,yte jako fotosensybilizatory dwutlenku tytanu. Ró,ne typy oddzia,ywa, elektronowych pomi,dzy kompleksami powierzchniowymi a pod,o,em pó,przewodnikowym znajduj, odbicie w ró,nych wydajno,ciach generacji fotopr,du i ró,nym stopniu fotosensybilizacji materia,ów na ,wiat,o widzialne. Wszystkie badane uk,ady wykazuj, efekt fotoelektrochemicznego prze,,czenia fotopr,du na skutek zmian potencja,u fotoelektrody i zmian d,ugo,ci fali ,wiat,a padaj,cego (efekt PEPS), dlatego te, stanowi, bardzo dobre modele prostych prze,,czników fotoelektrochemicznych. Niniejsza praca szczegó,owo okre,la mechanizm fotosensybilizacji i prze,,czenia fotopr,du na podstawie analizy oddzia,ywa, pomi,dzy kompleksem a powierzchni, pó,przewodnika. Obliczenia kwantowo-mechaniczne potwierdzaj, postulowany mechanizm. [source] Grid services for earthquake scienceCONCURRENCY AND COMPUTATION: PRACTICE & EXPERIENCE, Issue 6-7 2002Geoffrey Fox Abstract We describe an information system architecture for the ACES (Asia,Pacific Cooperation for Earthquake Simulation) community. It addresses several key features of the field,simulations at multiple scales that need to be coupled together; real-time and archival observational data, which needs to be analyzed for patterns and linked to the simulations; a variety of important algorithms including partial differential equation solvers, particle dynamics, signal processing and data analysis; a natural three-dimensional space (plus time) setting for both visualization and observations; the linkage of field to real-time events both as an aid to crisis management and to scientific discovery. We also address the need to support education and research for a field whose computational sophistication is rapidly increasing and spans a broad range. The information system assumes that all significant data is defined by an XML layer which could be virtual, but whose existence ensures that all data is object-based and can be accessed and searched in this form. The various capabilities needed by ACES are defined as grid services, which are conformant with emerging standards and implemented with different levels of fidelity and performance appropriate to the application. Grid Services can be composed in a hierarchical fashion to address complex problems. The real-time needs of the field are addressed by high-performance implementation of data transfer and simulation services. Further, the environment is linked to real-time collaboration to support interactions between scientists in geographically distant locations. Copyright © 2002 John Wiley & Sons, Ltd. [source] Conflict and support interactions in marriage: An analysis of couples' interactive behavior and on-line cognitionPERSONAL RELATIONSHIPS, Issue 1 2005Lesley L. Verhofstadt The present study examined the similarities and differences in couples' interactive behavior and interaction-based cognition that emerged in comparisons of conflict and support interactions in marriage. In a laboratory experiment, 53 couples were randomly assigned to the conditions of a 2 (type of interaction: conflict vs. support) × 2 (initiator of interaction: man vs. woman) factorial design. Partners provided questionnaire data and participated in a joint interaction and video review task. The data revealed substantial behavioral similarities (i.e., some classes of validation/facilitation behaviors and neutral problem-solving behaviors) as well as behavioral differences (i.e., some classes of invalidation/oppositional behaviors) between conflict and support interactions, controlling for levels of marital satisfaction. Partners' interaction-based cognition (e.g., feeling understood, satisfied) was especially affected by classes of validation/facilitation behaviors and was consistently related to marital satisfaction. In broad terms, the impact of a particular behavior on partners' ongoing cognition did not depend on the interaction domain (conflict vs. support) in which the behavior occurred. [source] Specifically modified osteopontin in rheumatoid arthritis fibroblast-like synoviocytes supports interaction with B cells and enhances production of interleukin-6ARTHRITIS & RHEUMATISM, Issue 12 2009Yasuhiro Take Objective Osteopontin (OPN) is expressed by fibroblast-like synoviocytes (FLS) in rheumatoid arthritis (RA), but its pathologic role is still obscure. The present study was undertaken to analyze the role of OPN in RA by focusing on its effects on cell,cell interactions between FLS and B lymphocytes. Methods FLS obtained from 10 patients with RA and 10 non-RA subjects and a B lymphocyte cell line were studied. The characteristics of OPN expression by FLS were analyzed by Western blotting, immunoprecipitation, and immunofluorescence studies. In cocultures of FLS and B lymphocytes, the effects of OPN on adhesion of B lymphocytes to FLS and the consequent production of interleukin-6 (IL-6) were analyzed in experiments involving overexpression and knockdown of OPN and inhibitory studies with an OPN-blocking antibody. In vivo, the expression of OPN in RA synovium was examined by immunohistochemistry. Results A specifically modified 75-kd form of OPN was predominantly expressed in RA FLS, and this was associated with expression of >200-kd thrombin-cleaved OPN that was crosslinked with fibronectin and localized on the surface of the FLS. In FLS,B lymphocyte cocultures, 75-kd OPN,positive FLS produced a significantly higher amount of IL-6 than did 75-kd OPN,negative FLS. When the FLS were separated from B lymphocytes or cultured alone, the production of IL-6 was low and was not significantly different between these 2 culture conditions. Moreover, OPN overexpression enhanced production of IL-6 in 75-kd OPN,positive FLS,B lymphocyte cocultures. Addition of the OPN-blocking antibody inhibited the adhesion of B lymphocytes to FLS. Immunohistochemical analyses revealed that localization of IL-6,positive cells coincided with the sites at which OPN and B lymphocytes were colocalized. Conclusion Specifically modified 75-kd OPN was expressed by RA FLS. This form of OPN affected FLS,B lymphocyte interactions by supporting the adhesion of B lymphocytes to FLS and enhancing the production of IL-6. [source] | |||||||||||||