排序方式: 共有30条查询结果,搜索用时 15 毫秒
1.
可分2-D系统是一类具有良好特性的重要的特殊2-D系统,它在多方面均有重要的应用.本文在已有结果的基础上对具有可分性的2-D多输入多输出系统在再实现问题、渐近稳定性代数判据、状态观测器设计等方面进行了较为广泛的研究,得到了许多较好的结果. 相似文献
2.
S KUTSUMIZU Y WATANABE S YANO H TACHINO H HARA Y KUTSUWA 《Journal of Materials Science》1997,32(1):99-103
Manganese(II) (Mn(II)) complex salts of poly(ethylene-co-methacrylic acid) (EMAA) were produced from a precursor Mn(II) salt of EMAA and eight different kinds of organic amines, and their oxygen-gas (O2) sorption behavior was investigated using visible absorption and infrared spectroscopies. It was found that the Mn(II) complex salts exhibit a selective O2 sorption during ageing at room temperature in air and release sorbed O2 molecules from ionic aggregates of the Mn(II) complex ions above 343 K in vacuo. From these results, the relationship between the O2 sorption behaviour and the chemical structure of amines is discussed. 相似文献
3.
Mechanism of inactivation of heat-tolerant spores of Bacillus stearothermophilus IFO 12550 by Rapid Decompression 总被引:1,自引:0,他引:1
ISAO HAYAKAWA SOICHI FURUKAWA AKIHIRO MIDZUNAGA HIROSHI HORIUCHI TAICHI NAKASHIMA YSUAKU FUJIO YUKIO YANO TSUYOSHI ISHIKURA KADZUO SASAKI 《Journal of food science》1998,63(3):371-374
The effect of three rapid decompression methods to clear the mechanism of inactivation of heat tolerant spores of Bacillus stearothermophilus IFO 12550 was investigated. Pressurization of the spores at 200 MPa and 75°C for 60 min caused a kill of 104 CFU/mL by the link-motion system but the nonrotational rod valve and E.G. seal methods gave a kill of about 103 CFU/mL. Sterilization was due to the physical breakdown of spore coat, and was induced by its physical permeability of water at high pressure and temperature. Rapid decompression by the link-motion system at 200 MPa decreased the D-value of the spores from 3000 min (100°C, one atmosphere) to 6 min, 11 min, and 17 min at 95, 85, and 75°C, respectively. 相似文献
4.
A deformation of microstructure was attempted on native potato starch and the change in the microstructure was analyzed from the fractal view point. The surface area calculated from the monolayer molecular number was different depending on the molecules used (Ar, N2, Kr, 1-propanol, and benzene), which showed the surface microstructure was a fractal with the dimension 2.1-2.4. The specific surface area measured using N2 and benzene was a function of the mean diameter of the material particles, which also showed that the porous structure of the particle was a fractal with the dimension 2.2-3.0. On the other hand, the sorption isotherm of water vapor was independent of particle diameter. 相似文献
5.
We investigate the product cycling problem (also known as the common cycle scheduling problem) when there are economies of scale due to increasing yield rates. Increasing yield rates are characteristic of production processes in which the percentage of acceptable parts increases with the duration of the production run, usually owing to adjustments made during the initial portion of the production run. We develop a solution procedure that is optimal for a wide range of production cost functions under very mild conditions. We then compare optimal solutions with those obtained from the commonly used 'fixed-plus-linear' approximation of costs. Computational results suggest that the 'fixed-plus-linear' approximation generally performs well, but may result in substantial errors under certain extreme conditions. 相似文献
6.
The economic lot scheduling problem (ELSP) has received much attention recently. The general version of the problem has a non-convex objective function, so it is difficult to find truly optimal solutions. We examine the three most popular heuristic approaches to the fixed-sequence ELSP. Each approach imposes one or both of these simplifying constraints: the zero-switch constraint (production of a part is started only when its inventory is depleted) and the equal-lot constraint (the lot size of a given part is constant through time). We provide a formulation that clarifies the relationships between the general problem and the three constrained versions, and compare their performances in a computational study. 相似文献
7.
Effects of Heat Transfer by Radiation and Convection on Browning of Cookies at Baking 总被引:1,自引:0,他引:1
The effects of modes of heat transfer (radiation or convection) on the baking color development of food were studied. An experimental baking oven that could be altered to two heat transfer modes was designed; the ratio of heat by radiative transfer to total heat transferred was about 30% or 70%. The glucose-glutamate solutions were heated at different air temperatures to measure the browning rates to calculate the activation energies. Cookies were baked at 200°C to measure the lightness of color on the surface and the surface temperature. It was clarified that the development of color depended on the temperature only. 相似文献
8.
A frequency-to-voltage conversion technique is described by using a surface-acoustic-wave delay line with three interdigital transducers, one for input and two for output. Two output signals have a phase difference corresponding to different delay lengths, which are detected as a frequency-to-voltage converted signal via a differential amplifier. The operational principle as a discriminator is reported together with successful experimental results. This type of frequency-to-voltage converter is valid in a number of applications where high frequency is an important consideration. 相似文献
9.
10.