Materials Literature
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A mean-field nonlinear equation for the mean-square displacement, recently proposed by one of the present authors [M. Tokuyama, Phys. Rev. E 62, R5915 (2000); Physica A 289, 57 (2001)], for concentrated, equilibrium suspensions of hard spheres is extended to describe equilibrium atomic systems of hard spheres. The val…
Functionally gradient materials (FGM) have a spatial distribution of permittivity in order to achieve an efficient stress control. The application of FGM to solid spacers for gas insulated switchgear (GIS) is expected to improve electric field distribution around the spacer. In this paper, we discussed the applicabili…
The paper deals with the surface charge accumulation on spacers of gas-insulated substations (GIS) applied to HVDC. The surface charge accumulation on solid insulators is a major problem of HVDC systems because it distorts the field distribution and reduces the breakdown voltage. The paper presents the mechanism and e…
This paper describes epoxy casting, insulation and operating mechanism technologies applied to newly developed solid insulated switchgear (SIS). The main insulating material is epoxy resin of high toughness and high thermal-resistance. This resin increases mechanical and electrical strength, and enables the vacuum int…
This publication deals with UHF and acoustic partial discharge (PD) detection sensitivity assessment of paper/oil insulation configurations which are typical of power transformers. Even though the basis of this topic has been developed some time ago, the knowledge of the accuracy and limits of the sensitivity is of in…
Advances in liquid crystal (LC) materials and VLSI technology have enabled the development of multi-phase spatial light modulators (SLM) that can perform high-resolution, dynamic optical beam positioning as well as temporal and spatial beam shaping in the 1550 nm optical communication window. These attractive features…
Surface charge accumulation on insulating materials, which are located next to electrodes in electrical devices may lead to a change of the electrical field. In some cases the breakdown voltage of electrode arrangements could be exceeded. For the investigations an insulating plate made from PTFE was used. The test set…
The synthesis and structure of the tautomeric Cd(II) isoindoline zwitterion coordination compound [Cd(4'-MeLH)(NO(3))(2)].CH(3)OH (4'-MeLH = 1,3-bis[2-(4-methylpyridyl)imino]isoindoline) are reported. In methylene chloride solution, tautomer interconversion occurs as the N-H proton moves between the identical imine ni…
This research studied the optimal design of shape memory alloy (SMA) muscle wire bundle actuators. Current literature describes the use of multiple muscle wires placed in parallel to increase the lifting capabilities of an SMA actuator, which however, is limited to wires of like-diameter. A constrained optimization pr…
The high frequency model of transformer winding is indispensable in analyzing the transients particularly caused by the very fast transients which occur at the time of disconnecting switch operations. The transients in transformer have been analyzed using a circuit of interlinked inductances and capacitances whose val…
As the components operating at high frequency and switch mode excitation, parasitic parameter extractions of power electronics magnetics, such as transformers, have many special issues. A parasitic capacitance related with leakage inductance and winding resistance in the lumped circuit model of a transformer is found…
Free-standing conductive films of organic−inorganic hybrids were prepared employing the sol−gel process of (3-glycidoxypropyl)trimethoxysilane (GPTMS) and water-borne conductive polyaniline (cPANI) in water/ethanol solution. The hybrids displayed a percolation threshold for electrical conductivity at a volume fraction…
To study in detail the interaction of copper atoms and clusters in various, potentially important catalytic oxidation states (Cu, Cu +, and Cu 2+ ) on polar surfaces, we have applied a hybrid QM/MM embedding model within the computational chemistry package ChemShell. Using the model, we study specific Cu/ZnO surface s…
A critical step toward the construction of complex architectures based on nanoscale carbonaceous materials is to interface these structures with other useful nanoscale building blocks. Herein we report the synthesis of a new class of binary nanomaterials from single-walled carbon nanohorns and nanoparticles by utilizi…
Epoxy-silicate nanocomposites were prepared by dispersing synthetic layered silicates modified with alkylammonium ions. In the dispersing process, the organically modified layered silicates were mixed in epoxy resin with shearing, and aggregations of the silicates were removed by centrifugal separation after mixing ep…
With a high-pressure gas treatment it is possible to force extra gas inside a cellular polymer film structure, expand the film and thus reduce the film stiffness. A permanent increase in the film thickness can be in the range of 100% when using ambient temperature of about 90/spl deg/C and gas pressure of about 20 bar…
The complexation between a polyion and an oppositely charged spherical macroion in the framework of the primitive model has been studied by the use of Monte Carlo simulations. The polyion length, linear charge density, and bare persistence length are varied systematically, while the properties of the macroion are kept…
The structure of gold cyanide, AuCN, has been determined at 10 and 300 K using total neutron diffraction. The structure consists of infinite [bond]Au[bond](CN)[bond]Au[bond](CN)[bond] linear chains, hexagonally packed, with the gold atoms in sheets. The Au-C and Au-N bond lengths are found to be identical, with d(Au(-…
A simulation model of a continuous disc type 6.6 kV transformer winding was used to study the propagation behaviour of partial discharge (PD) pulses. The model based on multi-conductor transmission line theory uses a single turn as a circuit element with the capacitance, inductance, and losses calculated as distribute…
Single-walled carbon nanotubes are efficiently cut to precise submicrometer lengths and very narrow length distributions. Chemical functional groups are placed selectively only at the ends without the nanotube walls being modified or damaged. The new methodology includes lithography to place protective photoresist pat…