Materials Literature
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[reaction: see text] It was found that a cylindrical macrotricyclic host containing two dibenzo[24]crown-8 cavities could self-assemble with two dibenzylammonium salts to form a stable 1:2 complex in solution and in the solid state, in which multiple hydrogen-bonding and pi-pi stacking interactions between the host an…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTPreparation of Thermosensitive Diblock Copolymers Consisting of MPEG and PolyestersMoon Suk Kim, Hoon Hyun, Gilson Khang, and Hai Bang LeeView Author Information Medicinal Science Division, Korea Research Institute of Chemical Technolog…
The relationship between strain rate sensitivity and activation volume for face-centered-cubic metals is proposed based on the bow-out model of single dislocation from its source, which gives reasonable prediction of the enhanced strain rate sensitivity that occurs in nanostructured and ultrafine grained Ni and Cu.
[reaction: see text] We have developed a convenient synthesis of tetraalkoxyphenanthrene derivatives and demonstrated their use to form luminescent conjugated oligomers and polymers. Palladium-catalyzed cross-coupling reactions of 2,7-diiodo-3,6-dimethoxy-9,10-di(2-ethylhexyloxy)phenanthrene produced high molecular we…
The aim of this study was to investigate the effect of Ca(2+) concentration in culture medium on the promotion of osteogenesis by MG63 osteoblast-like cells and to prepare bone-like tissues by supplying Ca(2+)-enriched medium to MG63 cells immobilized in three-dimensional gelatin hydrogels. Human osteosarcoma MG63 cel…
Thin films of MoO3 and mixed Mo/W oxides have been obtained by atmospheric pressure (AP)CVD, using pyrolytic decomposition of metal carbonyls. The correlation between film structure and optical properties is studied by applying techniques such as Raman spectroscopy (RS), Fourier transform infrared (FTIR) spectroscopy,…
Com o objetivo de estudar o efeito de diferentes posições do relevo e materiais de origem sobre as características mineralógicas da fração argila dos solos, foram estudadas duas toposseqüências de Latossolos (Latossolo Bruno ácrico LBw e Latossolo Vermelho distroférrico LVdf) no Estado do Paraná. A fração argila foi e…
Knitted structures occupy a special position in composite preforming due to their inimitable characteristics. An insight into the knitted structures with respect to their composite preforming characteristics is presented in this article. Directionality of knitted structures and requirements of high performance fibers…
New Transparent Conducting Al-doped ZnO Film Preparation Techniques for Improving Resistivity Distribution in Magnetron Sputtering Deposition, Minami, Tadatsugu, Miyata, Toshihiro, Ohtani, Yuusuke, Mochizuki, Yuu
An improvement of the mechanical properties of powder metallurgically produced NiTi shape memory alloys was attained by reducing the impurity contents of oxygen and carbon. Elongation at fracture was increased to 16.5 % for Hot Isostatically Pressed (HIP), as well as for net‐shape samples produced by Metal Injection M…
The transformation of pentlandite, (Ni,Fe) 9 S 8 , to violarite, (Ni,Fe) 3 S 4 , has been investigated under mild hydrothermal conditions, at constant values of pH (range 3 to 5) controlled by the acetic acid/sodium acetate buffer. At 80 °C, 20(4) wt% of the pentlandite transforms to violarite in 33 days; with the add…
Magnetic Zn1−xCoxO nanorods were fabricated via direct hydrothermal synthesis. The measurements of x-ray diffraction, x-ray photoemission spectroscopy, and optical absorption spectra demonstrate the presence of cobalt in the +2 state in a tetrahedral crystal field, which indicates that Co ions have been doped into the…
Transformers are essential elements, which facilitate the transmission of electric power at high voltages over long distances and transformer energization is a common occurrence. The energization can lead to excessive transient inrush current, especially when the transformer core has remnant flux that adds to the flux…
Abstract Mineralogical and thermal characteristics of synthetic Al-, Cr-, Mn-, Ni- and Ti-bearing goethites, synthesized via alkaline hydrolysis of metal-ferrihydrite gels, were investigated by powder X-ray diffraction and differential thermal analysis. Shifts in unit-cell dimensions were consistent with size of subst…
Abstract The formation of mixed-metal-Al layered double hydroxide (LDH) phases similar to hydrotalcite has been identified as a significant mechanism for immobilization of trace metals in some environmental systems. These precipitate phases become increasingly stable as they age, and their formation may therefore be a…
Abstract The reduction of structural Fe in smectite is mediated either abiotically, by reaction with dithionite, or biotically, by Fe-reducing bacteria. The effects of abiotic reduction on clay-surface chemistry are much better known than the effects of biotic reduction. Since bacteria are probably the principal agent…
This paper develops a modified nucleation theory and examines its application to simulate the bubble nucleating phenomena in polymeric foaming processes. Bubbles typically nucleate homogeneously in the bulk phase of the polymer/gas solution and heterogeneously at the boundaries between the bulk phase and the nucleatin…
Abstract The performance and degradation of Solid Oxide Fuel Cells (SOFC) were studied under severe operating conditions. The cells studied were manufactured in a small series by ECN, in the framework of the EU funded CORE‐SOFC project. The cells were of the anode‐supported type with a double layer LSM cathode. They w…
A family of nanoparticles featuring surfaces of varying hydrophobicity was synthesized. The efficiency of DNA-binding was determined, demonstrating in a fivefold modulation in binding a 37-mer DNA strand. Nanoparticle-binding causes a reversible conformational change in the DNA structure, as demonstrated by circular d…
This paper introduces some numerical methods pertaining to the simulation of charge transport in solid dielectrics that can be of interest to the electrical engineering community. These methods are generally scattered over numerical analysis and computing literature making difficult for the non-specialist to select th…