Materials Literature
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Franckeite, approximately Pb 4.6 Ag 0.2 Sn 2.5 Fe 0.8 Sb 2 S 12.6 , consists of alternating pseudohexagonal (H) and pseudotetragonal (Q) layers. Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) of freshly cleaved franckeite, from San José, Bolivia, revealed the atomic structure of the pseudohexago…
Prepregs have become accepted where performance, material qualification and product consistency are paramount requirements, as in aerospace, defence, marine, offshore, mass transit and renewable energy sectors. George Marsh reviews prepreg materials and manufacture.
Chemical adsorption and desorption of hydrogen atoms on single-walled carbon nanotubes (SWNTs) are investigated by using molecular dynamics simulations. It is found that the adsorption and desorption energy of hydrogen atoms depend on the hydrogen coverage and the diameter of the SWNTs. Hydrogen-adsorption geometry at…
AP 5280 is a novel polymer-conjugated platinum anticancer agent currently undergoing phase I clinical trials. It is pharmaceutically formulated as a lyophilized product containing 200 mg platinum per dosage unit. The aim of this study was to determine the reconstitution and dilution fluid of choice, and to investigate…
Abstract A storage study of deep‐fat‐fried banana chips was carried out for 8 weeks at ambient temperature (27 °C), using four types of packaging material: laminated aluminium foil (LAF), oriented polypropylene (OPP), polypropylene (PP) and low‐density polyethylene (LDPE). The physicochemical and sensory characteristi…
The purpose of this paper is to present the results of stress damage observation using a giant magnetoresistive sensor and a high performance measuring system. Selected digital signal processing algorithms were applied in order to enhance the obtained signals and extract parameters suitable for quantitative stress eva…
Neppiness is one of the most important aspects of cotton yarn quality and significantly influences the appearance of woven and knitted fabrics produced from that yarn. The direct sources are neps and trash contained in the cotton fiber sliver feeding the spinning frame. Nevertheless, not all neps cause yarn faults. Fo…
Isoporphyrin zinc(II) complexes can be synthesized using the MacDonald ["2+2"] approach, with suitably substituted dipyrromethanes and 5,5-dialkyldipyrromethanes. The zinc(II) complexes are stable, show characteristic optical and 1 H NMR spectra, and have been characterized as perchlorate salts by X-ray diffraction. A…
We theoretically study a single disclination motion in a thin free-standing liquid crystalline film. Backflow effects and the own dynamics of the orientational degree of freedom (bond or director angle) are taken into account. We find the orientation field and the hydrodynamic velocity distribution around the moving d…
In reactions of polyetherols prepared from hydroxymethyl derivatives of uric acid and typical oxiranes with isocyanates and water one obtains a new group of polyurethane foams containing purine rings in their structure. These polyurethanes withstand prolonged heating at temperatures as high as 200°C. Preliminary resul…
The influence of attrition milling on the thermal decomposition of kyanite (Al 2 O 3 ·SiO 2 ) to mullite (3Al 2 O 3 ·2SiO 2 ) and SiO 2 , and its subsequent sintering, was studied. A commercial kyanite was attrition‐milled for times up to 12 h. Dilatometry confirmed that as‐received unmilled kyanite decomposes between…
Abstract Two cement pastes commonly used in concrete formulations were characterized by XPS before and after coating with an epoxy resin and a hardener. The XPS allowed the surface chemistry change induced by the organic coating to be monitored. In particular, the C 1s spectra were peak fitted in order to deduce the c…
The octahedra were observed in the γ CuI crystallites synthesized by hydrothermal method using 1.6g (C2H5OO)2Cu and 2.66g KI as precursors at 200 °C for 12 hours in the de-ionized water. The effect of additives on the morphology of γ-CuI crystallites was investigated. Results show that the morphology of γ-CuI crystall…
Relationships have been investigated between subjective pressure sensation and objective pressure measured, for knit garments of different sizes and fabrics with different extensibilities. Fechner's logarithmic law is used to investigate the relations. Equations are obtained for describing the Psychophysical mechanism…
The effect of NOx purging on the corrosion behaviour of stainless steel in hot 8M nitric acid has been investigated. Gravimetric corrosion rate measurements and electrochemical potential and polarisation data made on nitric acid grade (NAG) 18/10L stainless steel are related to the concentration of nitrous acid produc…
A liquid-liquid phase transition is discovered in a system of collapsing hard spheres using the thermodynamic perturbation theory. This is the first evidence in favor of the existence of that kind of phase transition in systems with purely repulsive and isotropic interactions.
Thin zirconia films prepared by self-assembled monolayer-mediated deposition from an aqueous medium were investigated by transmission electron microscopy and electron-energy-loss spectroscopy. As-grown films were amorphous, and annealing at temperatures below 525°C did not influence the film structure. Annealing at 55…
Tri(1-chloro-3-etoxy-propane-2-ol) borate (I) was obtained by reaction of tri(hydroxyethyl) borate and epichlorohydrin. Reaction product was applied as fire retardant for preparation of rigid polyurethane-polyisocyanuratefoams. As the (I) content was increased from 0.1 to 0.4 of the chemical equivalent, the compressiv…
ABSTRACT: Internal atmosphere modification in fruits and vegetables by surface film coatings depends on film permeability, coating thickness, and fruit surface coverage. Research in this area has been mostly empirical, with unpredictable results and diverse conclusions. To reduce variability, it is necessary to have a…
Diagnostic measurements performed for surge arresters are normally studied by evaluating their suitability to detect aging and degradation of metal oxide material. The suitability of different methods for revealing internal moisture in arresters has not been studied much. This aspect is considered in the paper based o…