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排序方式: 共有116条查询结果,搜索用时 15 毫秒
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Joo-Hong Choi Soon-Jong Ha Young-Chul Bak Young-Ok Park 《Korean Journal of Chemical Engineering》2002,19(6):1085-1090
In order to investigate the filtration properties of fly ash from a conventional coal power plant, the filtration drag across
the dust cake over an absolute fiberglass filter element was measured. A fluidized bed column was utilized to obtain a well
characterized particle stream. The cake resistance coefficient was analyzed by the equation proposed by Endo et al. [1998]
in order to observe the effect of particle size and polydispersity. The filtration drag was measured for three kinds of particle
stream having the geometric mean particle size of 3.15, 6.07, and 7.83 μm and the geometric standard deviation less than 1.44
in the practical operation conditions for the field applications of face velocity of 0.03–0.06 m/s and area dust load up to
0.2 kg/m2. A dust cake of smaller particle size showed larger pressure drop even though the porosity was higher and presented high
compressibility according to the face velocity. The particle polydispersity was also a dominant factor affecting the compressibility
of the dust cake. 相似文献
4.
好氧生物反应器的进料物(Feed)是经厌氧作用的消化污泥,而其接种体(Seed)是活性污泥。主要研究了四种Feed/Seed比值(1:0,3:1,1:1和0:1)对好氧生物处理效率的影响。对于Feed/Seed比值为1:0和0:1而言,污泥的TSS和VSS的去除率很低。而另外两种比值的实验结果表明,TSS和VSS的去除率均随Feed/Seed比值的增加而增加。对于Feed/Seed比值为3的生物反应器,28天的TSS和VSS的去除率分别达到了49%和50%。并且TSS和VSS的降解服从一级反应动力学。动力学降解常数(k)也随Feed/Seed比值的增加而增加。而且VSS的去除率略高于TSS。另外,硝化反应的发生导致好氧生物反应器中的硝酸根离子浓度的增加和pH的降低。 相似文献
5.
Interaction effects of starch mixtures within surimi gels were investigated by modified distance-based design and analyzed by linear and nonlinear backward regression models. Nonlinear regression model showed highly significant interaction terms of starch-surimi, starch-water, and starchstarch. The response trace plot revealed that shear stress and shear strain were quite sensitive to changes in amounts of starch components. Optimum solution with combinations of various starches, surimi, and water was provided using linear and nonlinear programming. 相似文献
6.
A Li/SOCl2 bobbin-type cell, connected in parallel with an electrochemical capacitor, is investigated in order to overcome the voltage delay problem at high-rate discharge. In spite of the high internal resistance of the Li/SOCl2 cell due to the passivation, the voltage delay is suppressed. Impedance measurements, in which the cell is separated from the capacitor, explain the suppression process clearly. The electrochemical capacitor operates as a high-current buffer and voltage-delay suppressor for the Li/SOCl2 bobbin-type cell. 相似文献
7.
The ultrafast laser based hybrid machining system was studied and a novel approach was demonstrated to improve laser machining quality on metals by vibrating the optical objective lens with a low frequency (500 Hz) and various displacements (0-16.5 μm) during a femtosecond laser machining process.The laser used in this experiment is an amplified Ti:sapphire femtosecond (10-15 s) laser system that generates 100 femtosecond pulses having an energy of 3.5 mJ/pulse with a 5 kHz repetition rate at a central wavelength of 790 nm.It is found that both the wall surface finish of the machined structures and the aspect ratio obtained using the frequency vibration assisted laser machining are improved compared with those derived via laser machining without vibration assistance. 相似文献
8.
CHANG JUNG KIM DAE SUNG YOON ZHONG-TAO JIANG KWANGSOO NO 《Journal of Materials Science》1997,32(5):1213-1219
The crystal orientations of lead zirconate titanate (PZT) thin films have been investigated by using various drying temperatures
in the sol–gel process. The films were dried at different temperatures between 310 and 350°C for pyrolysis and then were heat
treated at 650°C using rapid thermal annealing (RTA). TG/DTA and FTIR spectroscopy were used to detect the remnants of organic
materials in the thin films prior to the final heat treatment. In order to examine the relationship between the film orientation
and the remaining organic materials for the prior and final heat treatment, the films were fabricated with different coating
cycles and dried for different holding times and then annealed at 650°C. The preferred orientations were investigated using
X-ray diffraction.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
9.
Jae Sung YOON Tae-Jin JE Doo-Sun CHOI Sung Hwan CHANG Kyung-Hyun WHANG 《中国有色金属学会会刊》2011,(Z1):100-103
A novel fabrication process for micro patterns with curvature was introduced. The curved structures were made by compensating rectangular micro structures with liquid photoresist layer. Because of the surface tension of the liquid in micro scale, various shapes of meniscus can be made on the micro channels. The micro channels were made on the silicon substrate in advance, and then the liquid layer was coated on the micro channels. From the nature of liquid behavior, the curved patterns with smooth surface are obtained, which cannot be made easily with the conventional mechanical machining, as well as with the microfabrication processes, such as wet and dry etching. With this principle, it is expected that the smooth and curved surfaces can be made by simple processes and the results can be applied widely, such as optical patterns. 相似文献
10.
Correlation Between Oxidative Deterioration of Unsaturated Lipid and n-Hexanal during Storage of Brown Rice 总被引:3,自引:0,他引:3
MYUNG GON SHIN SUK HOO YOON JOON SHICK RHEE TAI-WAN KWON 《Journal of food science》1986,51(2):460-463
n-Hexanal in the headspace over cooked brown rice stored at 5°C and 35°C for 0, 4, 8 and 12 months was determined by a gas chromatographic method using modified direct vapor injection. The off-flavors of stored brown rice were evaluated by n-hexanal and oxidized linoleic acid analysis. The amount of n-hexanal was found to be linearly proportional to the amount of oxidized linoleic acid (correlation coefficient, 0.99). Therefore, the simple and rapid method of vapor injection gas chromatography can be used for determining n-hexanal in the headspace vapor over cooked brown rice. Thus, the off-flavor of the stored brown rice resulting from lipid oxidation can be detected indirectly. 相似文献