Materials Literature
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The effect of the magnetic-wall boundary condition on the isofrequency and dispersion characteristics of magnetostatic waves propagating in an in-plane magnetized ferrite plate (film) is investigated. The situations are analyzed where this condition is satisfied on one of the ferrite’s surfaces and at a certain distan…
Selectivity of amine-terminated poly(amidoamine) (PAMAM-AT) dendrimers as host molecules for phenol blue and Nile red guests was investigated using absorption and fluorescence spectroscopies. Phenol blue has been known to associate near the core in the PAMAM-AT dendrimers. Nile red has also been shown to associate wit…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
We derive Free energy and the macroscopic charge distribution in ferroelectric and ferroelectric heterostructures from a microscopic quantum mechanical model, and attempt to bridge the macroscopic and the atomic/quantum mechanical pictures. We postulate that ferroelectric should be defined in a heterostructure, especi…
An algorithm is proposed for determining the crystal structure of compounds. In the framework of this algorithm, X-ray powder diffraction patterns are compared using a new similarity index. Unlike the indices traditionally employed in X-ray powder diffraction analysis, the new similarity index can be applied even in t…
Abstract Since the early 1990s EBSD (Electron Back Scatter Diffraction) has been developed to become a mature crystallographic analysis technique at the micro and nano-scale. It is applied in a SEM (Scanning Electron Microscope) on samples with a very smooth and clean surface. It provides quantitative orientations of…
In this paper, the equivalency between the foaming time and foaming temperature of the cell density, the number of cells per unit volume remaining in the foamed plastics, will be discussed. The foaming was carried out by the following method. The blowing agent was soaked into the solid resin at high pressure under tem…
Molecular dynamics (MD) simulations are carried out for model aluminium with 500, 864, 1372 and 2048 atoms interacting with Sutton-Chen version of embedded atom method (SCEAM) based on many body interactions. The systems equilibrated in an FCC structure have, first, been melted and then solidified with specifically se…
Nanometer-sized inorganic fillers are increasingly used as reinforcing materials for mechanical or thermal property improvement of polymers. Improvements in mechanical modulus or heat deflection temperature are often realized. These fillers may also improve some electrical properties such as corona endurance or dielec…
OBJECTIVE: To study chemical constituents from Cynanchum auriculatum. METHOD: The chemical components were isolated and purified by silca gel, sephedex-LH-20 and ODS column chromatography. The chemical structures were elucidated on the basis of physicochemical properties and spectral data. RESULT: Thirteen compounds w…
Degradation of chitosan in solution under the action of redox radical initiators was studied with the aim to prepare chemically oligomers of natural polysaccharides. The influence of temperature on the rate and extent of the process was examined. The optimal ratios of the substrate to initiator and of the reductant to…
The influence of deposition conditions on the antireflection properties of diamond-like carbon films for Si-based solar cells is studied theoretically. The values of the short-circuit current density for Si solar cells covered by diamond-like carbon films deposited at different concentrations of nitrogen in the gas mi…
A scheme of purification of malate dehydrogenase from Macromonas bipunctata strain D-405 and Vulcanithermus medioatlanticus DSM 14978T was developed. This scheme was used to obtain electrophoretically homogeneous enzyme preparations of the mesophilic bacterium M. bipunctata (specific activity, 26.9 +/- 0.8 U/mg protei…
A new approach is proposed for explaining the experimental data on sonoluminescence of acoustic and laser-induced cavitation bubbles. It is suggested that two different sonoluminescence mechanisms, namely, thermal and electric ones, are possible and that they manifest themselves depending on the bubble dynamics. An in…
This paper describes our progress achieved in thin-film free-standing monocrystalline silicon (FMS) solar cells by layer transfer process using porous silicon. The highest cell efficiency achieved for a 1times1 cm2FMS solar cell is 13.5% with an open circuit voltage Voc=612 mV, current density Jsc=28.9 mA/cm2and fill…
Abstract Green rust 2 (GR2(SO 2− 4 )) was detected amongst the products formed on a carbon steel rod exposed to atmospheric corrosion using X‐ray diffraction (XRD). The presence of green rust 2 has been related to sulphate reducing bacteria (SRB) in the sea spray. These were detected using test catch rods made out of…
Platinum has been introduced into pillared clay as a complex with the organosilicon amine N’ -[3-(trimethoxysilyl)propyl]diethyltriamine, as a complex with the organosilicon amine and zirconyl chloride, as an ammine complex, and by impregnation with a chloroplatinic acid solution followed by hydrogen reduction. The ca…
A crucial factor in the tissue engineering of heart valves is an effective cell seeding with uniform cell distribution on biodegradable scaffolds to eventually form functional tissue constructs in vitro. In our laboratory, we developed a new cell-seeding device for optimal cell distribution for tissue-engineered heart…
Abstract For improving the performance of ceramic thermoelectric materials an increase in the effective mass is required because it is the main factor determining the Seebeck coefficient, in the case of a semiconductor with sufficiently high carrier concentration. The Ruddlesden–Popper phase Sr 3 Ti 2 O 7 , with its c…
A multi-scale analysis is presented to parametrically describe the Mode I delamination of a carbon fiber/epoxy laminate. In the midplane of the laminate, carbon nanotubes are included for the purposes of selectively enhancing the fracture toughness of the laminate. To analyze carbon fiber epoxy carbon nanotube laminat…