Highly conductive coatings of carbon black/silica composites obtained by a sol-gel process

Conductive submicronic coatings of carbon black (CB)/silica composites have been prepared by a sol-gel process and deposited by spray-coating on glazed porcelain tiles. Stable CB dispersions with surfactant were rheologically characterized to determine the optimum CB-surfactant ratio. The composites were analyzed by Differential Thermal and Thermogravimetric Analysis and Hg-Porosimetry. Thin coatings were thermally treated in the temperature range of 300-500degC in air atmosphere. The microstructure of the coatings was determined by scanning electron microscopy and the structure evaluated by confocal Raman spectroscopy. The electrical characterization of the samples was carried out using dc intensity-voltage curves. The coatings exhibit good adhesion, high density and homogeneous distribution of the conductive filler (CB) in the insulate matrix (silica) that protects against the thermal degradation of the CB nanoparticles during the sintering process. As consequence, the composite coatings show the lowest resistivity values for CB-based films reported in the literature, with values of ~7times10 -5Omegam.

Revisão taxonômica e filogenia do gênero Megalobrachium Stimpson, 1858 (Crustacea: Decapoda: Anomura: Porcellanidae)

O presente trabalho trata do gênero de porcelanídeos Megalolobrachium Stimpson, 1858 e está organizado em três partes: (1) uma revisão taxonômica das espécies atualmente atribuídas a Megalobrachium Stimpson, 1858; (2) uma revisão da diversidade morfológica do gênero em um contexto maior dentro de Porcellanidae; e (3) uma análise cladística a partir de dados morfológicos com o intuito de testar o monofiletismo de Megalobrachium e propor a primeira hipótese filogenética para o gênero. A revisão taxonômica se baseou no estudo de material abundante de diferentes localidades do Pacífico oriental e Atlântico ocidental. Uma nova espécie de Megalobrachium é descrita com base no material das costas pacíficas do Panamá e Colômbia, totalizando 13 espécies em Megalobrachium. Para a análise filogenética, foram obtidos 151 caracteres; o grupo-externo foi composto por quatro espécies de três gêneros: Pachycheles Stimpson, 1858, Pisidia Leach, 1820, e Porcellana Lamarck, 1801. Uma única árvore (314 passos; IC: 64; IR: 80) foi obtida, com dois clados. O primeiro clado inclui espécies com lobos da fronte marcadamente flexionados, flagelo da antena curto, com artículos longos, patas ambulatórias curtas e robustas, abdome subtriangular em machos, pleópodo feminino iv com três segmentos, e urópodos curtos. O segundo clado contém espécies com lobos da fronte não flexionados, flagelo da antena longo, com artículos curtos, patas ambulatórias longas e delgadas, abdome sub-retangular, pleópodo feminino iv com dois segmentos, urópodos longos. O primeiro clado corresponde a Porcellanopsis Rathbun, 1910 (espécie-tipo P. festae (Nobili, 1901)), previamente tratado como sinônimo de Megalobrachium. Contudo, a combinação de diferenças morfológicas entre Megalobrachium e Porcellanopsis justifica a revalidação de Porcellanopsis. Três espécies foram erroneamente registradas no Pacífico oriental (M. mortenseni Haig, 1962, P. rosea (Rathbun, 1900) e P. soriata (Say, 1818)); essas espécies são exclusivamente distribuídas no Atlântico ocidental.

“Let the American potter be a professional amateur" Laura Anne Fry and the American art pottery movement

"Artist Laura Anne Fry blended the concepts of professional and amateur, and helped raise the merit of ceramics in the United States. Fry influenced American art pottery with her contributions to Rookwood Pottery of Cincinnati—changing the course of the company. Her successful experiments with decorating techniques helped Rookwood become a national leader in art pottery, and eventually led to over a decade of controversy between Fry and Rookwood"

Partial collapse of a ventilated stone façade: Diagnosis and analysis of the anchorage system

The mechanical behaviour of transventilated façades performed by natural stone is necessarily based on the correct execution of both anchoring elements on the stone cladding as in the ones corresponding to the enclosure support, either with brick masonry walls or reinforced concrete walls. In the case studied in the present work, the origin of the damages suffered on the façade of a building located in Alcoy has been analyzed, where the detachment of part of the outer enclosure occurred. This enclosure is a transventilated façade formed by Bateig Blue stone tiles. To this end, “in situ” tests of the anchoring systems employed have been performed, as well as laboratory tests of mechanical characterization of the material and of different types of anchor, comparing these results with those obtained in both the simplified analytical models of continuum mechanics as developed by the Finite Element Method (FEM).

Mujeres, salud y profesiones sanitarias: revisión historiográfica y estudio de casos en la sanidad española contemporánea

La reconstrucción histórica de las prácticas de salud de las mujeres, tomando el caso español como campo de pruebas y modelo de análisis, constituye una de las líneas directrices de éste trabajo. Sobre la base de una importante cantidad de estudios empíricos, ajenos y propios, centrados muy en especial en el área de la enfermería, se puede delinear una imagen de conjunto sobre el trabajo sanitario de las mujeres, en el espacio geográfico y temporal objeto de nuestro estudio y contestar así a una serie de cuestiones en las que lo experto, la experiencia, la autoridad y los procesos de legitimación profesional están omnipresentes. La segunda de las vertientes abordadas es la de las mujeres como pacientes y usuarias de prácticas de salud. Las llamadas “patologías de mujeres” como la clorosis o la neurastenia y el significado histórico del protagonismo de las mujeres en las campañas y programas de educación sanitaria son otros tantos ejemplos que permiten desvelar discursos cargados de elementos ideológicos tradicionales pese a su aparente barniz de modernidad. Como principales conclusiones, hay que destacar la importancia que alcanzaron los discursos androcéntricos en temas concernientes a salud y mujer de forma global, o los más específicos como el del culto a la fecundidad para justificar unas tareas sociales diferentes y complementarias a las del hombre, además de señalar la conveniencia de explorar nuevos caminos a recorrer, tanto desde el punto de vista temático como en lo relativo a los recursos heurísticos.

Tab. 3: Differentiation of eroded material in the Arctic Russian Seas

Volumes of Holocene (10 000 years) terrigenous sediments and annnal sediment supply in the Laptev Sea were evaluated from average thickness of the Holocene veneer. Volumes of deposits supplied from various sediment sourees and by different proeesses (abrasion of hinterland and island shores, river discharge, eolian input, drifting ice) were diseriminating of deposition in the eoastal zone, at river/sea barrier, and in the shelf basin itself. Accumulation by drifting iee and the role of local sea bottom erosion were also considered. Total amount of sediments transported from the Laptev Sea shelf to Amundsen and Nansen Basins of the Aretie Ocean was compared with other Russian Aretie seas.

Catalogue of the collection of old Chinese porcelains,

Mode of access: Internet.

Wakan taishō Keitokuchin tōroku : ichimei zoku tōsetsu /

Translation of: Ching-te chen tʻao lu.

China, silver and pottery.

Mode of access: Internet.

An encyclopedia of antiques,

"First printing, September 1937."

La céramique chinoise : porcelaine orientale: date de sa découverte, explication des sujets de décor,--les usages divers classification /

Mode of access: Internet.

Das Porzellan /

Includes index.

A collection of rare old Chinese porcelains collected by Sir William Bennett /

Mode of access: Internet.

Porzellan /

At head of title: Kunstgewerbe-Museum.

The practical printer: a complete manual of photographic printing,

Mode of access: Internet.