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排序方式: 共有87条查询结果,搜索用时 15 毫秒
31.
Drying of sintered spheres of coarse glass beads with a wide sintering range in superheated steam under vacuum was studied.
In samples with sintered angles of 7.5° -27°, the experimental normalized drying rates in superheated steam at pressures of 7.3-7.9mmHg were smaller than those for 56.0-767.6 mmHg in the vicinity of the critical moisture cotents for 56.0-767.6GmmHg. As reported in an earlier paper, there were 相似文献
In samples with sintered angles of 7.5° -27°, the experimental normalized drying rates in superheated steam at pressures of 7.3-7.9mmHg were smaller than those for 56.0-767.6 mmHg in the vicinity of the critical moisture cotents for 56.0-767.6GmmHg. As reported in an earlier paper, there were 相似文献
32.
Takuji Kobori Mitsuharu Nakahara 《The Structural Design of Tall and Special Buildings》1994,3(4):217-226
In 1890, a twelve-story octagonal sight-seeing tower was constructed as a high rise building in Tokyo Asakusa Park. In 1923, however, the top of the tower from the eighth floor up collapsed due to the Great Kanto Earthquake. In order to raise public interest in disaster prevention, we performed as a virtual experiment a conceptual attempt to save the tower without fundamentally changing its architectural characteristics by applying the most advanced structural control techniques. In the simulation, the top of the tower from the eighth floor experienced, almost exactly as described in historical record, a shear fracture during the initial period of principal shock. The modified Ryounkaku Tower would have ensured a comfortable margin of safety even against earthquakes more severe than the Great Kanto Earthquake in 1923. 相似文献
33.
Effect of SiO2 Powder on Mirror Polishing of InP Wafers 总被引:1,自引:0,他引:1
Yuji Morisawa Isao Kikuma Naoki Takayama Manabu Takeuchi 《Journal of Electronic Materials》1997,26(1):34-36
This paper describes a mechanical-chemical polishing technique of InP wafers using NaOCl, citric acid, and SiO2 powder solutions. The polishing rate rapidly increases by adding SiO2 powder to NaOCl and citric acid solutions. We study the dependence of the polishing rate on SiO2 powder and discuss the mechanicalchemical effect of the mirror polishing of InP wafers with NaOCl, citric acid, and SiO2 powder solutions. We observe an increase in the polishing rate of InP wafers from 0.2 to 0.9 μm/min when SiO2 powder is added to NaOCl and citric acid solutions. 相似文献
34.
To investigate the detection method of intergranular (IG) cracking susceptibility by hydrogen in irradiated austenitic stainless steel (SS), magnetic and mechanical properties were examined after two repeats of hydrogen charging and discharging (hydrogen treatment) in Type 304 SS which had been irradiated during use in different reactor cores. The residual magnetic flux density (Br) was measured with a superconducting quantum interference device sensor and Br increased with increased neutron fluence and repeated hydrogen treatments. Elongation decreased with an increase of Br and IG cracking appeared above Br of 2×10−5 T for this measuring method after repeated hydrogen treatments. These phenomena would be caused by hydrogen-induced martensite phase being formed on grain boundaries. It was thought the appearance of IG cracking susceptibility due to hydrogen in irradiated SS could be predicted by measuring the Br of the steel. 相似文献
35.
Toshiaki Kusunoki Masakazu Sagawa Mutsumi Suzuki Etsuko Nishimura Mitsuharu Ikeda Kazutaka Tsuji 《Journal of the Society for Information Display》2010,18(12):1127-1134
Abstract— Large‐screen (32‐in. WXGA and 17‐in. VGA) displays using metal—insulator—metal (MIM) cathode arrays have been developed. A cathode structure with low‐resistance electrodes and low‐capacitance emitters shortens signal delay and decreases the voltage drop in large MIM‐cathode arrays. By using a dual‐scan method, the signal delay was suppressed to less than 30% of the horizontal scan time in the 32‐in. WXGA panel. Emission efficiency of the cathode array was improved to 3% by reducing the surface work function of the top electrode from 4.7 to 3.9 eV. The cathode life was also improved to more than 10,000 hours. The display panel incorporating the cathode arrays and high‐efficiency P22‐phosphor screens with 3‐mm spacers showed high screen brightness (average brightness, 378 cd/m2; peak brightness, 832 cd/m2) at an anode voltage of 10 kV. 相似文献
36.
37.
Weiying Cheng Shigeru Kanemoto Ichiro Komura Mitsuharu Shiwa 《NDT & E International》2006,39(5):374-383
A partial-contact stress corrosion crack (SCC) is electrically modeled as a crack region with non-zero conductivity in eddy current testing (ECT). This partial-contact effect is excluded by an optimally designed crack-conductivity-insensitive depth characterization signal function (DCSF), and consequently the master curves obtained from electric-discharge machining (EDM) notches can be utilized directly in the depth sizing of SCCs. Furthermore, a crack conductivity independent artificial neural network (ANN) is constructed so that the entire depth profile can be reconstructed regardless of the crack conductivity. These two approaches are numerically validated and applied to the characterization of SCCs in SUS304 from measurement ECT signals. The average depth of each SCC is fast estimated from the DCSF, and the detailed depth profile is reconstructed from ANN. The ECT depth-sizing results show reasonable agreement with UT-TOFD measurement. 相似文献
38.
Y Morisawa N Higashi K Takaba N Kariyama T Goto A Ikehata Y Ozaki 《The Review of scientific instruments》2012,83(7):073103
A far-ultraviolet transient absorption spectrometer based on time-resolved attenuated total reflectance (ATR) has been developed and tested for aqueous solutions of phenol and tryptophan in the region 170-185 nm. In this region, a stable tunable laser was not available, and therefore, white light from a laser-driven Xe lamp source was used. The time resolution, which was determined by the time response of a continuous light detector, was 40 ns. A new ATR cell where a sample liquid is exchanged continuously by a flow system was designed to reduce efficiently the stray light from the excitation light. We have tested the performance of the instrument by using aqueous solutions of phenol and tryptophan, whose photochemistry is already well known. Phenol and tryptophan have very strong absorptions due to a π-π? transition near 180 nm. Even for dilute solutions (10(-3) mol dm(-3)), we could observe decreases in their concentrations due to photochemistry that occurred upon their irradiation with a fourth harmonic generation laser pulse produced by an Nd:YAG laser. The sensitivity of the spectrometer was about 10(-4) abs, which corresponded to a concentration variation of 10(-3) mol dm(-3) for phenol and tryptophan. 相似文献
39.
40.
Ayumi Maruta 《电力电子技术》2009,43(10)
介绍一种工业用2.5 kA/1.2 kV两单元IGBT模块.在该大电流器件中,P端到N端的内部连线电感非常小.半导体硅片的巧妙布局有效地提高了模块的散热能力,采用铝底板直接连接绝缘基板来提高热循环能力.对于这种底板面积较大的器件,为了获得更好的底板和散热片之间的热接触.底板被分成几段.2.5 kA/1.2 kV两单元IGBT模块的封装同样适用于1.8 kA/1.7 V两单元IGBT模块. 相似文献