1,721,164 research outputs found
Meso-alpo Prepared By Thermal Decomposition Of The Organic-inorganic Composite: A Ftir Study
No full textMesporous ALPO was synthesised using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent. FTIR spectroscopy was used to follow the formation of the ALPO mesophase by thermal decomposition of the aluminophosphate/surfactant composite and NH3 was used as probe molecule to monitor the surface acidity of the product.141417422Estermann, M., McCuster, L.B., Baerlocher, C., Merrouche, A., Kessler, H., (1991) Nature, 352, p. 320Davis, M.E., Saldarriaga, C., Montes, C., Garces, J., Crowder, C., (1998) Nature, 331, p. 698Kimura, T., Sugahara, Y., Kuroda, K., (1998) Micropor. Mesopor. Mater., 22, p. 115Masson, N.C., Pastore, H.O., (2001) Micropor. Mesopor. Mater., 44, p. 173Oliveira, E.C., Masson, N.C., Mascarenhas, A.J.S., Pastore, H.O., Colloids and SurfacesPeña, M.L., Dellarocca, V., Rey, F., Corma, A., Coluccia, S., Marchese, L., (2001) Microporous Mesoporous Mat., 44-45, p. 345Marchese, L., Gianotti, E., Maschmeyer, T., Martra, G., Coluccia, S., Thomas, J.M., (1997) Il Nuovo Cimento, 19 D, p. 1707Gianotti, E., Dellarocca, V., Martra, G., Marchese, L., Coluccia, S., Maschmeyer, T., in preparatio
OXIDE BASED MATERIALS. NEW SOURCES, NOVEL PHASES, NEW APPLICATIONS
No full textThe International Workshop "New sources, novel phases, new applications", the third of the series on "Oxide based materials", was held September 13 to 16, 2004 at Societ̀ del Casino Sociale in Como, Italy. The workshop brought together experimental and theoretical scientists of different origins and expertise to exchange information on common scientific research fields, especially on all those materials whose features and properties depend on the interaction between surface and ionic and/or molecular species. Knowledge of familiar materials was compared and experiences shared on a varied range of different materials, often new materials, including metal oxides, zeolites and other microporous compounds, mesoporous silicates and silica, hybrid inorganic-organic compounds, soil aggregates, layered materials, and bioactive glasses. * Brings together experimental and theoretical information * Provides information on new oxide-based materials with applications in catalysis, pollution control and nanoengineering * Contributions from experts in the field.The International Workshop "New sources, novel phases, new applications", the third of the series on "Oxide based materials", was held September 13 to 16, 2004 at Societ̀ del Casino Sociale in Como, Italy. The workshop brought together experimental and theoretical scientists of different origins and expertise to exchange information on common scientific research fields, especially on all those materials whose features and properties depend on the interaction between surface and ionic and/or molecular species. Knowledge of familiar materials was compared and experiences shared on a varied range of different materials, often new materials, including metal oxides, zeolites and other microporous compounds, mesoporous silicates and silica, hybrid inorganic-organic compounds, soil aggregates, layered materials, and bioactive glasses. * Brings together experimental and theoretical information * Provides information on new oxide-based materials with applications in catalysis, pollution control and nanoengineering * Contributions from experts in the field.Selected contents -- Phase transformations and structural modifications induced by heating in microporous materials. -- The synthesis, characterization and use of metal niobates as catalysts for propane oxidehydrogenation. -- Data processing of cation exchange equilibria in zeolites: a modified approach. -- Cyclohexane photocatalytic oxidative dehydrogenation to benzene on sulphated -- titania supported MoOx. -- Spectroscopic characterization of Fe-BEA zeolite. -- Synthesis of porous catalysts for Beckmann rearrangement of oximes. -- Templated and non-templated routes to mesoporous TiO2. -- Immobilization of Lipase on microporous and mesoporous materials:studies of the support surfaces. -- An EPR study of the surface reactivity of CaO and a comparison with that of MgO. -- The role of surfaces in hydrogen. -- Characterization of nanosized gold, silver and copper catalysts supported -- on ceria. -- Conjugated molecules in nanochannels: nanoengineering for optoelectronics. -- Removal of cadmium, zinc, copper and lead by red mud, an iron oxides containing -- hydrometallurgical waste.Conference proceedings.Includes bibliographical references and author index.Print version record.Elsevie
Acidity Of Mesoporous Aluminophosphates And Silicas Mcm-41. A Combined Ftir And Uv-vis-nir Study
No full textThe surface acidity of new mesoporous aluminophosphates, silicoaluminophosphates and [Si]-MCM-41 was studied by means of FTIR and DR UV-Vis-NIR spectroscopies using ammonia as probe molecule. Moreover, a novel Ti-grafted mesoporous ALPO was synthesised and studied by the use of DR-UV-Vis spectroscopy.142 B14191426Wilson, S.T., Lok, B.M., Messina, C.A., Cannan, T.R., Flanigen, E.M., (1982) J. Am. Chem. Soc., 104, p. 1146Estermann, M., McCuster, L.B., Baerlocher, C., Merrouche, A., Kessler, H., (1991) Nature, 352, p. 320Davis, M.E., Saldarriaga, C., Montes, C., Garces, J., Crowder, C., (1998) Nature, 331, p. 698Kimura, T., Sugahara, Y., Kuroda, K., (1998) Micropor. Mesopor. Mater., 22, p. 115Masson, N.C., Pastore, H.O., (2001) Micropor. Mesopor. Mater., 44, p. 173Maschmeyer, T., Rey, F., Sankar, G., Thomas, J.M., (1995) Nature, 378, p. 159Kresge, C.T., Leonowicz, M.E., Vartuli, W.J., Beck, J.S., (1992) Nature, 359, pp. 710MPeña, L., Dellarocca, V., Rey, F., Corma, A., Cosuccia, S., Marchese, L., (2001) Micron. Mesop. Mater., 44-45, p. 345Little, L.H., (1966) Infrared Spectra of Adsorbed Species, , Academic press, New YorkPuurunen, R.L., Root, A., Haukka, S., Iiskola, E.I., Lindblad, M., Krause, A.O.I., (2000) J. Phys. Chem. B, 104, p. 6599Marchese, L., Gianotti, E., Maschmeyer, T., Martra, G., Coluccia, S., Thomas, J.M., (1997) Il Nuovo Cimento, 19 D, p. 1707Gianotti, E., Dellarocca, V., Marchese, L., Martra, G., Coluccia, S., Maschmeyer, T., in preparationSinclair, P.E., Sankar, G., Catlow, C.R.A., Thomas, J.M., Maschmeyer, T., (1997) J. Phys. Chem. B, 101, p. 4232Marchese, L., Maschmeyer, T., Gianotti, E., Coluccia, S., Thomas, J.M., (1997) J. Phys. Chem. B, 101, p. 883
The Surface Acidity Of Mesoporous Silicoaluminophosphates: A Ftir Study
No full textThermally stable mesoporous ALPO and SAPO (Si/Al = 0.6) were synthesised using aluminum sulphate as aluminum source and without the need of HF as mineralizing agent. The mesophases prepared by this procedure were stable to calcination at 773K and presented a structure of non-parallel mesopores in the calcined form. FT-IR spectroscopy supplemented by the use of CO and NH 3 as probe molecules was used to monitor the surface acidity of these new mesoporous materials and indicated that Al-OH, P-OH groups for meso-ALPO and additionally SiOH groups for meso-SAPO are found on the surface of these molecular sieves. The acidities of P-OH and Al-OH are stronger than SiOH in mesoporous silicas but still weaker than the zeolitic Brönsted acid sites.154 B14981504Hartmann, M., Kevan, L., (1999) Chem. Rev., 99, pp. 635-663Sayari, A., Karra, V.R., Reddy, J.S., Moudrakovski, I.L., (1996) Chem. Commun., pp. 411-412Masson, N.C., Pastore, H.O., (2001) Micropor. Mesopor. Mater., 44-45, pp. 173-183Oliveira, E.C., Pastore, H.O., (2002) Stud. Surf. Sci. Catal., 141, pp. 297-300Zhao, D.Y., Luan, Z.H., He, H.Y., Klinowski, J., Kevan, L., (1998) J. Phys. Chem. B, 102, pp. 1250-1259Kimura, T., Sugahara, Y., Kuroda, K., (1998) Chem. Commun., pp. 559-560Chakraborty, B., Pulikottil, A.C., Das, S., Viswanathan, B., (1997) Chem. Commun., pp. 911-912Davis, M.E., Saldarriaga, C., Montes, C., Garves, J., Crowder, C., (1998) Nature, 331, pp. 698-699Estermann, M., McCuster, L.B., Baerlocher, C., Merrouche, A., Kessler, H., (1991) Nature, 352, pp. 320-323Morterra, C., Magnacca, G., (1996) Catal. Today, 27, pp. 497-532Feng, P., Xia, Y., Feng, J., Bu, X., Stucky, G.D., (1997) Chem. Commun., pp. 949-950Gianotti, E., Oliveira, E.G., Dellarocca, V., Coluccia, S., Pastore, H.O., Marchese, L., (2002) Stud. Surf. Sci. Catal., 142, pp. 417-422Marchese, L., Chen, J.S., Wright, P.A., Thomas, J.M., (1993) J. Phys. Chem., 97, pp. 8109-8112Chen, J.S., Wright, P.A., Thomas, J.M., Natarajan, S., Marchese, L., Bradley, S.M., Sankar, G., Lok, C.M., (1994) J. Phys. Chem., 98, pp. 10216-10224Marchese, L., Gianotti, E., Dellarocca, V., Maschmeyer, T., Rey, F., Coluccia, S., Thomas, J.M., (1999) Phys. Chem. Chem. Phys., 1, pp. 585-592Gianotti, E., Dellarocca, V., Oliveira, E.C., Coluccia, S., Pastore, H.O., Marchese, L., (2002) Stud. Surf. Sci. Catal., 142, pp. 1419-1426Gianotti, E., Dellarocca, V., Marchese, L., Martra, G., Coluccia, S., Maschmeyer, T., (2002) Phys. Chem. Chem. Phys., 4, pp. 6109-6115Onida, B., Geobaldo, F., Testa, F., Crea, F., Gamme, E., (1999) Micropor. Mesopor. Mater., 30, p. 119Katovic, A., Giordano, G., Bonelli, B., Onida, B., Garrone, G., Lentz, P., Nagy, J.B., (2001) Micropor. Mesopor. Mater., 44-45, pp. 275-281Onida, B., Borello, L., Bonelli, B., Geobaldo, F., Garrone, E., (2003) J. Catal., 214, pp. 191-199Coluccia, S., Marchese, L., Martra, G., (1999) Micropor. Mesopor. Mater., 30, pp. 43-56Zecchina, A., Lamberti, C., Bordiga, S., (1998) Cat. Today, 41, p. 16
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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