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排序方式: 共有121条查询结果,搜索用时 15 毫秒
1.
The transient temperature and stress fields in a quenched rectangular bar were computed and used to determine the stress intensity factors for midside and corner-edge cracks. The stress intensity factors, K 1 , are presented as a function of time, flaw size, and aspect ratio. The variations of AT, along the crack edge are given and the self-limiting growth of the crack depth is discussed in relation to the nonlimited surface growth. 相似文献
2.
Quadrupole interactions of 11 B and 27 Al in SiO2 -B2 O3 -Al2 O3 -R2 O glass systems were investigated to determine the structure of these glasses, which should be amenable to chemical strengthening. The ratio of BO4 units to BO3 units approached unity as the R2 O/Al2 O3 ratio for compounds having fixed B2 O3 contents approached unity. Nuclear quadrupole coupling constants ( e2 Qq/h =2.73 to 2.93 MHz) were measured for the NMR spectra of 11 B triangles. The line shapes of 27 Al spectra varied with chemical composition, but a few glasses exhibited 27 Al line shapes similar to those of the AlO4 triclusters in SiO2 -Al2 O3 -Na2 O glasses. Compositional trends in the formation of BO4 and AlO4 were deduced from the NMR spectra. 相似文献
3.
Dependence of Vacuum Electrical Breakdown Field and Field Enhancement Factor on the Number of Apertures Drilled in Small Electrodes 下载免费PDF全文
RYO ISHIDA YASUSHI YAMANO SHINICHI KOBAYASHI ATSUSHI KOJIMA MASAYA HANADA YOSHIO SAITO 《Electrical Engineering in Japan》2016,196(3):3-12
Dark current based on field emission current is considered to be a factor causing the vacuum electrical breakdown between multiaperture acceleration grids in the JT‐60 negative ion source. In this paper, we focus on field enhancement factor, which is a key parameter of field emission from the electrode. Vacuum breakdown testing for small‐sized electrodes simulating the multiaperture acceleration grids of the negative ion source was performed. We found the field enhancement factor and breakdown field for multiaperture electrodes, and we investigated the dependence of each parameter on the number of apertures. The results revealed that an increase in the average field enhancement factor after the end of conditioning resulting from an increase in the number of apertures led to a decrease in the dielectric strength of the multiaperture electrodes. 相似文献
4.
TOSHIHIRO KOBAYASHI 《International journal of control》2013,86(1):289-302
This paper deals with the design of a finite-dimensional model reference adaptive controller for a distributed parameter system. The space of inputs and the space of outputs are both one dimensional. First an input—output representation is introduced, using filtered values generated from the inputs and outputs. Next it is shown that we can design a finite-dimensional adaptive control system by a new adaptive law. The new adaptive law guarantees the existence of a large region of attraction from which all signals are bounded and the tracking error converges to a small residual set. 相似文献
5.
Takashi MINAMI Shohei ARAI Naoki KENMOCHI Hiroaki YASHIRO Chihiro TAKAHASHI Shinji KOBAYASHI Tohru MIZUUCHI Shinsuke OHSHIMA Satoshi YAMAMOTO Hiroyuki OKADA Kazunobu NAGASAKI Yuji NAKAMURA Kiyoshi HANATANI Shigeru KONOSHIMA Fumimichi SANO 《等离子体科学和技术》2013,(3):240-243
A new high repetition rate Nd:YAG Thomson scattering system is developed for the Heliotron J helical device.A main purpose of installing the new system is the temporal evolution measurement of a plasma profile for improved confinement physics such as the edge transport barrier (H-mode) or the internal transport barrier of the helical plasma.The system has 25 spatial points with ~10mm resolution.Two high repetition Nd:YAG lasers (>550mJ@ 50Hz) realize the measurement of the time evolution of the plasma profile with ~10ms time intervals.Scattered light is collected by a large concave mirror (D=800 mm,f/2.25) with a solid angle of ~100 mstr and transferred to interference filter polychromators by optical fiber bundles in a staircase form.The signal is amplified by newly designed fast preamplifiers with DC and AC output,which reduces the low frequency background noise.The signals are digitized with a multi-event QDC,fast gated integrators.The data acquisition is performed by a VME-based system operated by the CINOS. 相似文献
6.
The Influence Analysis that a Phase Characteristic of the High‐Level Earthquake Gives to Vibration Response Characteristic of the 550‐kV Disconnectors 下载免费PDF全文
KIYOSHI NAGATA TOMOYUKI OHYAMA HIROAKI SATO TOMOAKI ITO ATSUSHI ETO TAKAYUKI KOBAYASHI 《Electrical Engineering in Japan》2016,196(4):32-39
We developed the 550‐kV disconnectors that strengthened earthquake proofing by the addition of the damper unit and weight reduction of conductive part based on the damage of the 550‐kV disconnectors by the Great East Japan earthquake (March 11, 2011) and inspected the earthquake proofing performance by shake table test. In shake table test, we performed the test by the artificial seismic wave that varied in phase characteristic in addition to the test by resonance method. And, in a high‐level earthquake area, we analyzed it about the influence that a phase characteristic of the artificial seismic wave gave to stress to occur in disconnectors. As a result, it is thought that the stress to occur in disconnectors is decided by a primary natural frequency basically because a bending strain to occur to the disconnectors in the time when the resonance frequency ingredient becomes the big acceleration response value grows big. But, on a particular phase condition, it was confirmed that the bending strain to occur in disconnectors might grow big conspicuously. As for this, the possibility is thought about by influence of higher natural frequency doing superposition. 相似文献
7.
TOSHIHIRO KOBAYASHI 《International journal of systems science》2013,44(6):887-896
This paper deals with the design of a model reference adaptive controller for a distributed parameter system generated by a self-adjoint operator. The space of inputs and the space of outputs are both one dimensional. After introducing input-output representations, an adaptive control system is designed for the system with unknown input function and unknown output function. The input-output equations can be expressed using filtered values generated from the inputs and outputs 相似文献
8.
KEIJI KOBAYASHI 《Journal of the American Ceramic Society》1976,59(1-2):9-11
Chromium centers in isolated Cr ions and Cr(III)-Cu(II) redox interactions were investigated by optical and EPR spectra. Line shapes and intensities of high-field Cr(III)-Cu(II) superimposed EPR absorption lines were sensitive to alkali content of host glasses. High-field chromium g values (1.94 to 1.99) and intensities (190 to 3600) were calculated. The increase in g values from 1.96 to 1.98 is related to an increase in Cr(V) and to a conversion from Cu(I) to Cu(II) with increased alkali content. Two components of Cr powder spectra near g = 2.0 and g = 5.0 correspond to isolated octahedral Cr centers described by Landry et al. Cr-Cr pair structure was not observed for low Cr2 O3 concentrations. Three components of optical absorption bands near 340 nm, 430 to 460 nm, and 600 nm were measured in Cr(III)-Cu(II) redox systems. Electronic interactions of Cr(III)-Cu(II) redox systems and the structure of Cr centers are discussed. 相似文献
9.
高灰熔点煤高温下煤焦CO2/水蒸汽气化反应特性的实验研究 总被引:1,自引:2,他引:1
我国煤炭年产量中,1400℃以上的高灰熔点煤约占50%以上。为探索固态排渣方式的高灰熔点煤气流床气化,本文选出具有代表性的三种高灰熔点煤种和一种低灰熔点煤种,在TGA-51H型高温热天平上进行了煤焦-CO2和煤焦-水蒸汽气化反应特性的实验研究,并利用SEM考察了气化条件下煤焦及灰的微观结构。实验结果表明:在煤焦-CO2、H2O反应过程中,反应速度明显表现出高温区域的扩散反应和低温区域的化学反应;无论在1273K~1573K的低温区域,还是在高于1573K的高温区域,反应速率随燃料比(FC/V)的增加而减小。 相似文献
10.
TAKETOSHI TAKEMURA MASAHIRO KOBAYASHI YOSHIO TAKADA KEN SATO 《Journal of the American Ceramic Society》1986,69(5):430-436
The nonlinearity of ZnO varistors is significantly influenced by the Bi2 O3 and Sb2 O3 contents, as well as by the phase composition of the Bi2 O3 . Degradation of the current-voltage characteristics due to the applied voltage is not always lowered by the β—γ transition of the Bi2 O3 phase. Lattice parameter determinations and stress analyses suggest that the Bi2 O3 -rich phase in multigrain junctions causes mechanical strain at the grain boundary which may play an important role in the current-voltage characteristics of ZnO varistors. 相似文献