Materials Literature
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Compressed SF/sub 6/ gas is the main high-voltage insulation medium in gas insulated equipment. Recent progress in studies of high-voltage breakdown in uniform, quasi-uniform, and nonuniform field systems is described. This includes time lags to breakdown, the effect of particle contamination, and the flashover of ins…
Colossal Magnetoresistive p-n Junctions of Te-Doped LaMnO3/Nb-doped SrTiO3, LÜ Hui-Bin, Dai Shou-Yu, Chen Zheng-Hao, Liu Li-feng, Guo Hai-Zhong, Xiang Wen-Feng, Fei Yi-Yan, He Meng, Zhou Yue-Liang, Yang Guo-Zhen
Deals with the response of the actuator using shape memory alloy (SMA). The SMA actuator was developed for a robot. This study aims at the development of the position control system; control parameters are set automatically for the SMA actuator drives any kind of load. The SMA actuator in this study is box type actuat…
The authors present a variety of surface-drive film actuators and discuss their characteristics. An actuator consisting of a stator with three-phase 420 mu m-pitched electrodes and a slightly conductive slider was developed previously. A finer 100 mu m-pitched stator was fabricated and operated. A two-phase stator, wh…
Describes an experimental study on pattern recognition of a partial discharge (PD) in a cross-linked polyethylene (XLPE) cable by using a neural network (NN) system. The NN adopted was a three-layer artificial neural system with feedforward connections, and its learning method was a back-propagation algorithm incorpor…
Abstract Quantitative analysis of the formation energy of Cr vacancy in MgCr 2 O 4 was made by first principles calculation. A 56‐atom supercell was employed and relaxation of atoms within the second‐nearest‐neighbor shell of the vacancy was taken into account. The formation energy was calculated as a function of the…
A micropolarizer of nickel nanowire arrays within an anodic alumina membrane (AAM) was fabricated by anodization of pure Al and electrodeposition of Ni, respectively. X-ray diffraction, scanning electron microscopy and transmission-electron microscopy reveal that the nanowires are polycrystal and have an average diame…
The influence of accumulated charges on a polymer insulated surface on the 50% lightning impulse (1.2-50 mu s) has been investigated. The 50% flashover voltage was measured for three different conditions: under dry environment, immediately after immersing the upper shed and body of the insulator in saline water, and i…
A novel method for producing electrets is proposed in which an electric discharge is induced by a negative impulse voltage in a small air gap. The dielectric foil to be charged is placed between two planar electrodes, being in contact with one of them and separated from the other by the air gap. The electric discharge…
An investigation is described of the applicability of Fourier series/integral methods as printed circuit board thermal analyzers. The limitations of a totally uniform heat transfer coefficient for the board surfaces are shown to be somewhat compensated for by using lumped-parameter thermal resistances as board heat re…
High-vacuum beam transport tubes are being designed for use in an accelerator under development at Los Alamos. In areas such as weld-heat-affected zones, the tubes will require localized magnetic permeability of less than 1.02. Seven austenitic stainless steel candidates, 304L, 310, 316L, 317LN, 20Cb-3, Nitronic 33, a…
The main objective of this paper is to derive a simple, engineering model for a NiTi-based shape memory alloy (SMA) that can be used as a first-step, inexpensive computational tool in designing components including SMAs. The model is based on a Reuss approximation in which the stress in every grain is considered the s…
Techniques for calculating overheating effects of GIC (geomagnetically induced currents) on large shell-form transformers are described. The techniques include the method of calculating the exciting current and its harmonic content under DC injection in the transformer neutral; three dimensional magnetic flux calculat…
Abstract The calculations of the electric field gradients were performed in the different basis sets at the selected ab initio, density functional theory (DFT), and ECP levels of the theory. The most reliable QCC and η values were obtained within the DFT and with the use of B3LYP functional and middle 6‐31G* or extend…
Abstract The stability against the thermal annealing of a cocontinuous two‐phase morphology developed in polystyrene (PS)/low‐density polyethylene (LDPE) blends containing 80 wt % PS was investigated. Blends containing 1, 5, and 10 wt % of a tapered diblock poly(styrene‐block‐hydrogenated butadiene) (P(S‐ b ‐hB)) or t…
The authors describe an in-pipe micro mobile robot with a new actuator called the giant magnetostrictive alloy (GMA), which requires no power supply cables. The cableless micro mobile robots can be controlled by the magnetic fields supplied by the outer side. The mechanism of the motions is based on an inch-worm-type…
A new thioether functionalized organic-inorganic ordered mesoporous composite as a highly selective and capacious Hg2+ adsorbent was synthesized by one-step co-condensation of (1,4)-bis(triethoxysilyl)propane tetrasufide (BTESPTS, (CH3CH2O)3Si(CH2)3S-S-S-S(CH2)3Si(OCH2CH3)3) and tetraethoxysilane (TEOS), with tri-bloc…
An advanced mathematical model of a shape memory alloy (SMA) useful for designing SMA micro-devices is proposed and applied to coil spring theory to analyze the appropriate mechanical and electrical characteristics. This model can handle three phases of the SMA: the parent phase, the martensitic phase, and the R-phase…
This manuscript explores the apparent discrepancy between experimental data and theoretical calculations of the lattice resistance of bcc tantalum. We present the first results for the temperature dependence of the Peierls stress in this system and the first ab initio calculation of the zero-temperature Peierls stress…
Through the use of perturbation theory, in this work we develop a method which allows for a substantial reduction in the size of the plane-wave basis used in density-functional calculations. This method may be used for both pseudopotentials and all-electron calculations and is particularly beneficial in the latter cas…