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排序方式: 共有336条查询结果,搜索用时 15 毫秒
331.
Li-Ngee Ho Teng Fei Wu Hiroshi Nishikawa Tadashi Takemoto Koichi Miyake Masakazu Fujita Koyu Ota 《Journal of Materials Science: Materials in Electronics》2011,22(7):735-740
The thermal stability and electrical reliability of electrically conductive adhesives (ECAs) filled with Cu fillers alloying
with different amount of Ag and Mg (0.2–1.5 at.%), respectively, were studied by comparing their electrical resistivity under
high temperature exposure at 125 and 85 °C/85% RH for 1,000 h. Results showed that the Cu-Ag filled ECAs were superior to
Cu-Mg filled ECAs in terms of thermal stability during aging under high temperature exposure and high humidity condition.
A final resistivity on the order of 10−4 Ω.cm could be maintained for Cu-Ag filled ECAs after aging at 125 °C for 1,000 h. Cu-Mg filled ECAs showed relatively high
electrical resistivity compared to Cu-Ag filled ECAs. Resistivity of Cu-Mg filled ECAs increased rapidly over time during
high temperature exposure at 125 °C except for Cu-0.5 at.% Mg filled ECA which was thermally stable after 400 h of aging.
The ECAs in this study could withstand high temperature exposure at 125 °C better than aging under a combination of elevated
temperature and high humidity at 85 °C/85% RH. 相似文献
332.
Minglei Gu Satoshi Ogasawara Masatsugu Takemoto 《IEEJ Transactions on Electrical and Electronic Engineering》2014,9(2):219-227
This paper presents a position‐sensorless interior permanent magnet synchronous motor (IPMSM) control system at low and zero speed based on a multi‐space‐vector pulse‐width modulation (MSVPWM) pattern with the elimination of nonlinear inverter effects. In conventional sensorless methods based on the MSVPWM pattern, the high‐frequency (HF) components of voltage and current are used to estimate the rotor position information. However, the inverter nonlinear effects, such as forward voltage drops and deadtime, distort the HF components of the voltage and current so that an error occurs in the position estimation. Therefore, an improved position estimation scheme is developed in this paper. The compensated HF components of the voltage taking account of the inverter nonlinear effects can be used to decrease the estimation error. The proposed method can be implemented without increasing any hardware cost. Experimental results confirm the effectiveness of the proposed method. © 2014 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. 相似文献
333.
Improved analysis of a bearingless switched reluctance motor 总被引:4,自引:0,他引:4
Takemoto M. Suzuki H. Chiba A. Fukao T. Rahman M.A. 《Industry Applications, IEEE Transactions on》2001,37(1):26-34
Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. Bearingless switched reluctance motors have combined characteristics of switched reluctance motors and magnetic bearings. Production of radial force for rotor shaft magnetic suspension is explained with differential stator windings. Mathematical relations between motor currents and radial force are derived by considering cross coupling and fringing fluxes. Theoretical relationships are verified with experimental results at partial overlap positions 相似文献
334.
Mototsugu Takemoto Takuma Karasawa Hiroshi Mizumachi Mikio Kajiyama 《The Journal of Adhesion》2000,72(1):85-96
A series of ethylene vinyl acetate copolymer (EVA) were blended with various kinds of tackifiers and the miscibility between the components was investigated. The miscibility of the blend is illustrated as a phase diagram. The EVA and modified rosin systems tended to have a phase diagram with lower critical solution temperature (LCST), whereas the EVA and petroleum resin systems tended to have that with upper critical solution temperature (UCST). The phase diagrams of EVA/tackifier resins systematically changed as VAc content in the copolymer increased, which is accounted for by the classical Flory-Huggins theory. 相似文献
335.
Microstructural Interpretation on Reliquefaction of Saturated Granular Soils under Cyclic Loading 总被引:2,自引:0,他引:2
Masanobu Oda Ken Kawamoto Kiichi Suzuki Hiroyuki Fujimori Masayuki Sato 《Canadian Metallurgical Quarterly》2001,127(5):416-423
It is well known that the resistance to liquefaction of a saturated sand decreases sharply when it has been presheared, either cyclically or quasi statically, beyond a threshold value. The possible mechanism is discussed in light of recent findings on the microstructural anisotropy developed in preshearing (induced anisotropy). A columnlike structure, through which applied stress is mainly transmitted, grows parallel to the major principal stress direction in the strain hardening process. Voids, randomly distributed at first, are also connected in series between the columnlike structures. The anisotropic structure can carry the increasing stress as long as the major stress is applied parallel to the elongation direction of the structure. However, it becomes extremely unstable when the major stress is rotated. The excess pore-water pressure increases markedly under undrained cyclic loading, particularly when the connected voids are stressed perpendicular to their elongation direction. This is the reason why once liquefied sand sharply loses liquefaction resistance in a subsequent reliquefaction test. 相似文献
336.
Masanori Takemoto Shinji Sakai Kazunori Wakai Isao Sumida Tomoki Kondou Takayasu Inatomi 《亚洲传热研究》2000,29(5):412-426
The cross flow between subchannels in a BWR fuel assembly has been typically analyzed using three types of mixing models, namely, pressure difference, turbulent mixing, and void drift which are expressed by time‐averaged flow parameters. However, in our previous paper, we expressed the above cross flow phenomenon simply by a fluctuating pressure model and confirmed its validity experimentally. In this present study, we examine the relationship between the fluctuating pressure difference and the cross flow rate more precisely by using a short mixing zone with no steady pressure difference. Results show that the experimental cross flow data agree well with the calculations using this model. Furthermore, we tried to express the fluctuating pressure difference by using a sinusoidal wave as a new cross flow model. This model is shown to have no dependence on frequency. We verify that the cross flow can be analyzed using only the pressure difference amplitude. © 2000 Scripta Technica, Heat Trans Asian Res, 29(5): 412–426, 2000 相似文献