Influences of Grain Size on Mechanical Properties of Extruded AZ91 Mg Alloy after Different Extrusion Processes
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Heat-sensitive materials for uncooled microbolometer arrays
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text V. Yu. Zerov and V. G. Malyarov , "Heat-sensitive materials for uncooled microbolometer arrays," J. Opt. Technol. 68, 939- (2001) Export Citation BibTe…
Role of extracellular matrix molecules in shell formation and structure
Avian eggshells are natural composite bioceramics containing organic and inorganic phases. The occurrence and role of particular collagens and proteoglycans in the eggshell and their pattern of secretion by the oviduct is discussed. While type X collagen, the main constituent of the shell membranes, functions to inhib…
Characterization of anharmonicities on complex potential energy surfaces: Perturbation theory and simulation
We have systematically investigated the effect of anharmonicity on the equilibrium properties of systems with a complex potential energy surface. Anharmonicities are modeled by the temperature dependence of the harmonic frequencies {νi} near a stationary point of the PES. The low-temperature behavior is described by a…
Electrochromic Dye System for Smart Window Applications
A new coupled bipyridinium-based dye system showing excellent daylight, long term, and cycle stability is presented here. Cells with the coupled system show a stable switching performance for more than 4000 h. Deliberate matching of the counter anion/dye system with the solution allows compensation of the density chan…
Maxwell–Wagner piezoelectric relaxation in ferroelectric heterostructures
Using a serial bilayer model we show that heterogeneous ferroelectric systems may exhibit substantial Maxwell–Wagner piezoelectric relaxation. The relaxation has its origin in the coupling of the dielectric and piezoelectric properties. The model predicts both retardation (positive phase angle and counterclockwise cha…
USE OF MODIFIED CLAYS FOR CONTROLLING SOIL ENVIRONMENTAL QUALITY
In the last two decades, progress has been made in the modification of the properties of clay materials in order to produce new clay nanocomposite products that can be used for controlling soil environmental quality. Pillared organoclays and nanocomposites constitute a novel class of materials, prepared by propping ap…
Identification of diatoms (Bacillariophyceae) during ecological assessments: Comparison between Light Microscopy and Scanning Electron Microscopy techniques
Identification of diatom frustules, a vital step during ecological analyses, is greatly influenced by the magnification at which samples are examined. The striking differences between Light Microscopy (LM) and Scanning Electron Microscopy (SEM) reveal inconsistencies in the identification of diatoms at low magnificati…
Synthesis of Long-Chain Branched Propylene Polymers via Macromonomer Incorporation
Long-chain branched (LCB) poly(propylene)s (PP) are synthesized by the incorporation of pre-formed, vinyl-terminated macromonomers using metallocene catalysts. LCB-PP polymers made with isotactic PP macromonomers are characterized by means of multi-angle laser light scattering and extensional viscosimetry. The LCB pol…
Exploring Bioinorganic Pattern Formation in Diatoms. A Story of Polarized Trafficking
The world's oceans cover 70% of the surface of our planet. The photosynthetic organisms living within its photic zone are responsible for about one-half of global primary productivity. The most successful organisms are thought to be photosynthetic prokaryotes (cyanobacteria and prochlorophytes) and a class of eukaryot…
Improved Oxidation of Hydrocarbons with New Electrodes in High Temperature Fuel Cells
Although fuel cells work efficiently with hydrogen as a fuel there are still some major problems related to hydrogen availability and acceptability. In particular, it is still extremely difficult to obtain clean/renewable hydrogen. In the short to medium term future, the only realistic fuels for fuel cells are hydroca…
Enhanced corrosion resistance of magnesium and its alloys through the formation of cerium (and aluminium) oxide surface films
Cerium (and aluminium) oxide layers were formed on magnesium and its alloys (AZ91) by chemical surface treatment with or without subsequent annealing. The corrosion behaviour modifications provided by the formation of these surface films were studied by means of different electrochemical and surface analysis technique…
A Latch-Based Weibull Model for Polymerie Creep and Recovery
A model to represent creep and recovery in polymeric materials is described. This is based on the Weibull distribution function, which is commonly used for representing the failure of elements in mechanical systems. A mechanical representation of viscoelasticity is discussed, in which viscoelastic response is describe…
Enhancement Effect of Gold Nanoparticles on the UV-Light Photochromism of Molybdenum Trioxide Thin Films
A new kind of photochromic composite film is prepared by depositing gold nanoparticles onto the surface of MoO 3 thin film. It is found that gold nanoparticles can improve the UV-light coloration performance of the MoO 3 thin film. X-ray photoelectron spectroscopy and surface photovoltage spectroscopy measurements ind…
Kaolinite to Halloysite-7 Å Transformation in the Kaolin Deposit of São Vicente De Pereira, Portugal
Abstract The transformation of kaolinite to halloysite-7 Å was identified in the kaolin deposit of São Vicente de Pereira (SVP), using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). Both the 02, 1̄ and 13̄, 13 reflections show changes in the XRD patt…
Aluminium solubility mechanisms in moderately acid Bs horizons of podzolized soils
Summary The processes controlling the retention and release of aluminium in acid forest soils are still subject to controversy, and therefore a universal hypothesis as to what mechanisms are operating has not been firmly established. By studying the Bs horizons of Swedish and Swiss podzolized soils, and by analysing d…
Novel Columnar Tetraphenylethenes via McMurry Coupling
Several tetraphenylethenes 2a, 4a–i with lipophilic side chains were synthesized and their mesomorphic properties were investigated. The most promising candidates turned out to be tetrakis[4-(trisalkyloxybenzoyloxy)phenyl]ethenes 4e–i with chain lengths between C7 and C12. Compounds 4 were prepared by a convergent str…
Cyclic Fatigue‐Crack Growth and Fracture Properties in Ti 3 SiC 2 Ceramics at Elevated Temperatures
The cyclic fatigue and fracture toughness behavior of reactive hot‐pressed Ti 3 SiC 2 ceramics was examined at temperatures from ambient to 1200°C with the objective of characterizing the high‐temperature mechanisms controlling crack growth. Comparisons were made of two monolithic Ti 3 SiC 2 materials with fine‐ (3–10…
Morphological studies in selected fragilarioid diatoms (Bacillariophyceae) from Connecticut waters (U.S.A.)
Several fragilarioid diatoms were found in surface sediment samples from Connecticut (U.S.A.) as part of a paleolimnological study on a set of 60 freshwater lakes. Observation of acid-digested material under scanning electron microscopy (SEM) revealed morphological variants of Staurosira and Stauroforma absent or seld…
Bacterial attachment to stainless steel welds: Significance of substratum microstructure
AISI Type 304 L stainless steel (SS) is a widely used material in industry due to its strength and resistance to corrosion. However, corrosion on SS is reported largely at welds or adjacent areas. Bacteria were observed to colonize preferentially near welds as a result of surface roughness. In the present study, the i…