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In memoriam
Cemented materials in the LLW and MLW Spanish disposal
BWR and PWR cemented matrices to confine low and medium simulated liquid radioactive wastes have been submitted to the leaching process in de-ionized water at 20ºC and 40ºC, to obtain the medium leachability index (L) and the effective diffusion coefficient (De) of different ions. Otherwise, it has been studied the as…
Noticias
Torroja Institute, the historic building: conservation and characteristics of the materials of its façades
The "Instituto de Ciencias de la Construcción" building is one of the most singular engineering design done by Eduardo Torroja: it was started in 1951. This study focused on the Institute façade-building materials has been carried out in the 100th anniversary of his birth. The analysis has revealed that the design of…
Conservation study of the stone material used in the Culture House of Almirante Oquendo, in San Sebastian
The historical heritage of our country is mainly made up of masonry, playing the sandstones an important role. However, because of the effect of environmental conditions and pollution, these materials can loose their cement, and eventually disintegrate. Chemical consolidants can be applied in order to prevent and stop…
Información Bibliográfica
Alteration causes and processes in the stone material from the pavement in Baelo Claudia archeological site, Cadiz/Spain
A detailed study of the alteration causes in the stone material used in buildings and pavements from the ancient roman town of Baelo Claudia (Cádiz, South Spain) was carried out to establish their degree of conservation. Slabs from the pavement of the Forum showed in general a high and irreversible degree of degradati…
Mesoscopic hemisphere arrays for use as resist in solid state structure fabrication
The kinetics of formation of disordered arrays of hemispherically shaped islands of cesium chloride on an oxidized silicon wafer, starting from a deposited thin film of CsCl, has been investigated. The essential process step is the exposure of the CsCl thin film to water vapor. Transport of dissolved material in the a…
Biogeography and ecology of freshwater diatoms in Subantarctica: a review
Summary Subantarctica is situated between the Antarctic and the Subtropical Convergence and consists of the islands in the southern Atlantic, Indian and Pacific Oceans. Diatoms are an important component of all Subantarctic aquatic, moss and soil habitats. Taxonomic studies reveal a high diversity and species richness…
Phonons from neutron powder diffraction
The spherically averaged structure function $S(|\mathbf{q}|)$ obtained from pulsed neutron powder diffraction contains both elastic and inelastic scattering via an integral over energy. The Fourier transformation of $S(|\mathbf{q}|)$ to real space, as is done in the pair density function (PDF) analysis, regularizes th…
High dimensionality as an organizing device for classical fluids
The Mayer diagrammatic expansion for a classical pair-interacting fluid in thermal equilibrium is cast in a form particularly appropriate to high-dimensional space. At asymptotically high dimensionality, the series, when it converges, is dominated by a single term. Focusing upon repulsive interactions, the dominant te…
An infrared reflectance study of Si–O vibrations in thermally treated alkali-saturated montmorillonites
Abstract Infrared reflectance spectra of Li-, Na-, K-, Rb- and Cs-saturated samples of montmorillonite Zenith-N (Milos, Greece) have been measured in the 400–1300 cm -1 region in an attempt to elucidate the behaviour and migration properties of alkali cations after heating the montmorillonites at 300°C for 24 h. Decon…
High-Strength Conducting Polymers Prepared by Electrochemical Polymerization in Boron Trifluoride Diethyl Etherate Solution
Flexible metallic plastic sheets and filmsof two high-strength conducting polymers, polythiophene and poly(p-phenylene), are discussed. The synthetic procedure—electropolymerization in boron trifluoride diethyl etherate solution—is believed to be the key to the exceptional mechanical properties of these materials, whi…
Control of Microstructure and Orientation in Solution‐Deposited BaTiO 3 and SrTiO 3 Thin Films
Columnar and highly oriented (100) BaTiO 3 and SrTiO 3 thin films were prepared by a chelate‐type chemical solution deposition (CSD) process by manipulation of film deposition conditions and seeded growth techniques. Randomly oriented columnar films were prepared on platinum‐coated Si substrates by a multilayering pro…
Mineralogia da fração argila e estrutura de latossolos da região sudeste do Brasil
Este trabalho objetivou estudar a relação entre os constituintes mineralógicos da fração argila e o desenvolvimento da micro e macroestrutura de Latossolos do sudeste brasileiro. Para tanto, foram obtidas amostras do horizonte B de sete Latossolos, representativos deste grupamento, ocorrentes nos estados de Minas Gera…
High‐Resolution Transmission Electron Microscopy of Ti 4 AlN 3 , or Ti 3 Al 2 N 2 Revisited
The structure and chemistry of what initially was proposed to be Ti 3 Al 2 N 2 are incorrect. Using high‐resolution transmission electron microscopy, together with chemical analysis, the stoichiometry of this compound is concluded to be Ti 4 AlN 3‐delta (where delta = 0.1). The structure is layered, wherein every four…
Thermochromism in Commercial Products
Many commercial products change color with a change of temperature. How do they do it? The processes responsible for the two major categories of commercial thermochromic coloring agents are presented, along with a description of applications of thermochromic materials.
Competing frustration and dilution effects on the antiferrromagnetism in La(2-x)Sr(x)Cu(1-z)Zn(z)O(4)
The combined effects of hole doping and magnetic dilution on a lamellar Heisenberg antiferromagnet are studied in the framework of the frustration model. Magnetic vacancies are argued to remove some of the frustrating bonds generated by the holes, thus explaining the increase in the temperature and concentration range…
Polyethylene under tensile load: strain energy storage and breaking of linear and knotted alkanes probed by first-principles molecular dynamics calculations
The mechanical resistance of a polyethylene strand subject to tension and the way its properties are affected by the presence of a knot is studied using first-principles molecular dynamics calculations. The distribution of strain energy for the knotted chains has a well-defined shape that is very different from the on…