Materials Literature
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Atomically detailed simulations are used to compute the self-diffusivity and transport diffusivity of Ar and Ne through single walled carbon nanotube (SWNT) pores at room temperature. The diffusivities are computed over a range of loadings, corresponding to external equilibrium bulk pressures ranging from 0 to 100 bar…
The possibility of materials that are governed by a fixed point related to small world networks is discussed. In particular, large-scale Monte Carlo simulations are performed on Ising ferromagnetic models on two different small-world networks generated from a one-dimensional spin chain. One has the small-world bond st…
In this paper, we demonstrate external control over the magnetization direction in ferromagnetic (FM) In_{1-x}Mn_{x}As/GaSb heterostructures. FM ordering with T_C as high as 50 K is confirmed by SQUID magnetization, anomalous Hall effect (AHE), and magneto-optical Kerr effect (MOKE) measurements. Even though tensile s…
We consider in this review the statistical mechanical description of a very general microscopic lattice model of a compressible and interacting multi-component mixture of linear polymers of fixed lengths. The model contains several microscopic, i.e. bare parameters determining the thermodynamic state of the system. Ge…
Steady-state IR measurements for adsorption of only CO and under WGS reaction indicate that formates are present on the surface of partially reduced ceria, in contrast to a recent study, and that they are strongly limited at high CO conversions. At low temperatures and conversions, the formates are close to the equili…
Any polar-ordered material with a spatially uniform polarization field is internally frustrated: The symmetry-required local preference for polarization is to be nonuniform, i.e., to be locally bouquet-like or "splayed." However, it is impossible to achieve splay of a preferred sign everywhere in space unless appropri…
This paper reviews recent progress in the deposition of diamond and cubic boron nitride (cBN) films. It aims at the effort of preparing smooth surfaces, improving crystallinity and enhancing adhesion of diamond and cBN films. The properties of these materials, multi-stage growth processes and difference in synthesis o…
Crosslinked polyethylene (XLPE) insulated cables working in water are known to be easily degraded by forming water trees. This is one of the most serious concerns among users of XLPE cables. The possibility whether measurement of residual charge is usable as a tool to detect water trees in XLPE is discussed. Two types…
The design of XLPE cables, degradation factors to working XLPE cables, and exclusion methods of the degradation factors are reviewed. In addition, the soundness confirmation methods of extra high voltage XLPE cables are reviewed. As degradation factors of XLPE cables, electric stress degradation, partial discharge deg…
In high voltage applications, polymer insulation can be exposed to very high electrical field stress, resulting in long term exposure to corona. The electrical field stress may be much below dielectric breakdown threshold. Eventually the exposure to corona can lead to failure of the high voltage component. Nanometer s…
The authors propose a novel approach based on partial discharge (PD) current pulse waveform analysis (PD-CPWA) in order to assess insulation degradation of solid insulators with different kinds of defects. The CPWA technique focuses on the time transition of individual PD waveform parameters like rise time, fall time…
Gas Insulated transmission Line (GIL) is very well known for its high transmission rating of electrical power and its reliability. The high capacity of the transmission, the thermal, mechanical and the electrical behaviour of the new generation of the directly buried GIL were studied and tested by laying it in the gro…
Abstract New spin-crossover compounds, [Co(phimpy)2](ClO4)2 (1) and [Co(ipimpy)2](ClO4)2 (2) (phimpy = 2,6-bis(N-phenylformimidoyl)pyridine and ipimpy = 2,6-bis(isopropyliminomethyl)pyridine) were prepared, and the crystal structures were determined. The magnetic susceptibility measurements showed gradual transition f…
Design of a tuneable filter-phase shifter is presented. Thin ferroelectric film varactors are used to provide voltage tuneable phase shift in a silicon coplanar waveguide (CPW). Varactors with zero bias capacitance 0.17pF, loss tangent tan/spl delta/-0.04 and 20% tuneability provide continuous voltage tuneable phase s…
The leakage currents of various insulators were monitored together with environmental data at a coastal test site. In addition the daily maximum surface, conductivity was measured. In this paper it is shown how, using multiple regression, the leakage current can be predicted from the measured weather and environmental…
The high voltage transmission network in South Africa contains a relatively high percentage of non-ceramic insulators. Techniques for assessing the condition of these insulators are under investigation. Such techniques include imaging techniques that take either an infra-red image or an ultra-violet image of the insul…
A large-pore iron-substituted aluminophosphate molecular sieve of structure type AlPO 4 -36 was synthesized. Pure and highly crystalline FAPO-36 crystallized hydrothermally from a gel with a molar composition of 0.2:0.9:1:2:50 FeO:Al 2 O 3:P 2 O 5:Pr 3 N:H 2 O at 125°C after 7 days. The effects of the crystallization…
Metal-ferroelectric-insulator-semiconductor (MFIS) capacitors with 390-nm-thick SrBi/sub 2/Ta/sub 2/O/sub 9/ (SBT) ferroelectric film and 8-nm-thick hafnium oxide (HfO/sub 2/) layer on silicon substrate have been fabricated and characterized. It is demonstrated for the first time that the MFIS stack exhibits a large m…
Recombinant collagens are attractive proteins for a number of biomedical applications. To date, significant progress was made in the large-scale production of nonmodified recombinant collagens; however, engineering of novel collagen-like proteins according to customized specifications has not been addressed. Herein we…
Melusin is a muscle specific protein required for heart hypertrophy in response to mechanical overload. Here we describe a protein 63% homologous to melusin, named chp-1, expressed in all tissues tested, including muscles, and highly conserved from invertebrates to human. Both proteins are characterized in their N-ter…