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排序方式: 共有91条查询结果,搜索用时 15 毫秒
1.
CARBON ORDERING IN Fe-1.83C MARTENSITE Ⅰ. Crystal Structure of a Conventional Ordered Phase 总被引:1,自引:0,他引:1
采用电子衍射方法对Fe-1.83C马氏体室温时效时产生的有序相结构进行研究,确定其结构为偏离化学计量成分Fe_4C的γ′-Fe_4结构,称为γ′-Fe_xC(Ⅰ)(x=4-11)。碳原子位于单胞的1/2,1/2,1/2位置。该有序相单胞尺寸为:(a_M,c_M分别为马氏体单胞的a和c轴长度),它与母相完全共格,位向关系为(001)_Ⅰ∥(001)_M,[100]_Ⅰ∥[110]_M。根据γ′-Fe_xC(Ⅰ)晶体结构计算出的有序相衍射花样与实验得到的衍射花样全部吻合。 相似文献
2.
SHIN-ICHI IWAI TAKASHI WATANABE ICHIRO MINATO KIYOSHI OKADA† HIDEKI MORIKAWA 《Journal of the American Ceramic Society》1980,63(1-2):44-46
Thermal decomposition of mullite into corundum was investigated using a high-temperature X-ray single-crystal camera equipped with a gas-flame furnace and by scanning electron microscopy and electron probe microanalysis (EPMA). When heated to ∼1750°C, mullite decomposed to corundum by the liberation of the SiO2 component with topotaxial relations of:
Thus, it was considered that, when mullite decomposed into corundum, their oxygen close-packed planes were almost preserved. The SEM photographs showed that the crystals of the developed corundum are prismatic and ∼5 μm wide. The EPMA showed that the phase boundary between mullite and developed corundum is discontinuous. 相似文献
- (1)
(310)
mull ∥(001)cor ; [001]mull ∥[110]cor - (2)
(130)
mull ∥(001)cor ; [001]mull ∥[110]cor - (3)
(110)
mull ∥(001)cor ; [001]mull ∥[110]cor
Thus, it was considered that, when mullite decomposed into corundum, their oxygen close-packed planes were almost preserved. The SEM photographs showed that the crystals of the developed corundum are prismatic and ∼5 μm wide. The EPMA showed that the phase boundary between mullite and developed corundum is discontinuous. 相似文献
3.
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
4.
STUDIES ON THE GELATINIZATION RATE OF RICE AND POTATO STARCHES 总被引:1,自引:0,他引:1
KIYOSHI KUBOTA YOSHIHIKO HOSOKAWA KANICHI SUZUKI HIDEAKI HOSAKA 《Journal of food science》1979,44(5):1394-1397
5.
6.
SETSUO SAGARA ZI-JIANG YANG KIYOSHI WADA 《International journal of systems science》2013,44(8):1391-1401
A new approach to recursive parameter identification of second-order distributed parameter systems in the presence of measurement noise under unknown initial and boundary conditions is proposed. A two-dimensional low-pass filter is introduced to pre-filter the observed data corrupted by measurement noise. The low-pass filter is designed in the continuous time-space domain and discretized by bilinear transformation. Thus a discrete estimation model of the system under study is easily constructed with filtered input-output data for recursive identification algorithms. The recursive least squares method is still efficient in the presence of low measurement noise if the filter parameters are designed so that the noise effects are reduced sufficiently. Using filtered input data as instrumental variables, a recursive instrumental variable method is also presented to obtain consistent estimates when the digital low-pass filters are not designed successfully or when the output data is corrupted by high measurement noise. Illustrative examples are given to demonstrate the applicability of the proposed methods. 相似文献
7.
TAKASHI KURIHARA EIJI TSUTSUI EIJI NAKANISHI KIYOSHI MAKI KENICHI MURAKAWA KOJI MORIMOTO TOSHIHIRO TAKAHASHI TATSUKI OKAMOTO 《Electrical Engineering in Japan》2017,198(4):37-50
Dry‐cured and extruded three‐layer (E‐E type) 6.6‐kV cross‐linked polyethylene (XLPE) cables were introduced into electric power systems more than 30 years ago, but they do not experience failures because of water tree degradation. Also, the degradation index of water treeing for these cables has not been established. Therefore, investigating results of residual breakdown voltage and water tree degradation of these cables will help us plan for cable replacement and determine water tree degradation diagnosis scheduling, and will be fundamental data for cable lifetime evaluation. In this study, the authors measured the ac breakdown voltages of dry‐cured and E‐E type 6.6‐kV XLPE cables removed after 18 to 25 years of operation and observed the water trees in their XLPE insulation. As a result, it was observed that breakdown voltages were larger than the maximum operating voltage (6.9 kV) and the ac voltage for the dielectric withstanding test (10.3 kV). Water trees were mainly bow‐tie water trees and their maximum length was approximately 1 mm. Although the number of measured cables was limited, the lifetime of this type of cable was estimated to be approximately 40 years, even experiencing water immersion. 相似文献
8.
Effects of Microwave Heating on Lipoxygenase and Trypsin Inhibitor Activities, and Water Absorption of Winged Bean Seeds 总被引:2,自引:0,他引:2
Lipoxygenase and trypsin inhibitors in dry whole winged bean seeds were completely inactivated after microwave heating for 3.0 and 5.0 min, respectively. The soaking of the seeds, prior to microwave heating, considerably decreased the heating times needed to inactivate lipoxygenase and trypsin inhibitor. Furthermore, microwave heating was effective in increasing the rate of water absorption of the seeds. 相似文献
9.
KINETICS OF BIOETHANOL PRODUCTION FROM WHEAT MILLING BY-PRODUCTS 总被引:1,自引:0,他引:1
MARCOS ANTONIO DAS NEVES NAOTO SHIMIZU TOSHINORI KIMURA KIWAMU SHIIBA 《Journal of food process engineering》2007,30(3):338-356
An overview of the potential application of wheat milling by‐products as substrate for bioethanol production is presented. In order to select a suitable microorganism, model fermentations were conducted using glucose and dry baker's yeast. The overall ethanol yield was nearly stable (ca. 0.35 g/g), independent of mash glucose concentration; mashes with 100 g glucose/L resulted in an overall ethanol productivity of 3.48 g/L·h. Slurries containing low‐grade wheat flour (LG) (100, 200 or 300 g/L) were used for simultaneous saccharification and fermentation (SSF) with Zymomonas mobilis. Fermentation performance was evaluated based on ethanol concentration (P), productivity (Qv), yield (YP/S), production rate (Qp) and glucose consumption rate (Qs). Mashes containing 200 g LG/L produced about 52 g ethanol/L, with Qvof 2.17 g/L·h. Based on the relatively high fermentation rate of LG, reaching peak ethanol productivity within ca. 9 h of SSF, considerable savings on fermentation time was achieved. Using Z. mobilis for LG fermentation, P was about 30% higher than that obtained with Saccharomyces cerevisiae. 相似文献
10.
Egg white from which the precipitate occurring during dialysis against water had been removed gave a transparent gel on heating at lower salt concentrations and pH 3.54. The addition of NaCl or a shift of pH from 3.54 to 4.50 brought about the turbid gels. Creep analyses of these transparent and turbid gels were done using a four-element mechanical model. The instantaneous elastic modulus, E0, Newtonian modulus, ηn and retarded viscoelastic moduli, E1 and η1 increased with NaCl up to 125 mM and then decreased with increase in NaCl concentration at pH 3.54. At 125 mM NaCl and pH 3.54, a translucent gel was obtained. E0 and η1 decreased with the temperature of the gel, while E1 and η1did not change depending of temperature. 相似文献