Suboptimal Properties of an Ideal Cascade with Symmetric Steps
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Basis (linear algebra)
Separation (statistics)
Basis (linear algebra)
Separation (statistics)
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Abstract Understanding the relationship between the quasi-ideal cascade (QIC) and the matched abundance ratio cascade (MARC) is very helpful in analysis and research of the separation cascade mechanism as well as practical applications of the cascade theory. For different values of separation factors and separation condition, the relationship between QIC and MARC is investigated. It is determined that they belong to different types of cascades. Only when the separation factor is constant and the separation process is symmetrical, both cascades become equivalent. It follows that in practice these two types of cascades should be considered separately when searching the optimal cascade with its best separation performance.
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Component (thermodynamics)
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Minification
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A linear turbine cascade experimental apparatus often consists of only a few cascade blades. Advantages to this arrangement are increased from using larger cascade blades and easier optical access. However, fewer cascade blades in the cascade row make it difficult to establish periodic flow conditions between blades. In this study, a 160% pitch passage for cascade experiments with a single blade is designed to satisfy infinite cascade flow conditions without any flow control or tailboards. Fourteen geometric design variables are applied to the design of a 160% pitch passage by using a gradient-based optimization method and a genetic algorithm. Flow structures within a passage designed with a genetic algorithm are closer to the infinite cascade flow conditions than those obtained with a gradient-based method. The results show that infinite cascade flow conditions can be obtained by modifying only the passage walls of the cascade experimental apparatus.
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Adaptive IIR filters implemented in cascade-form are attractive due to the ease with which their stability may be monitored. Four cascade-form structures are compared for use in adaptive filtering with respect to complexity of implementation, error surface geometry, and adaptation speed. The four structures include a cascade of second order pole/zero sections, a cascade of second order all-pole sections followed by a tapped delay line, and two new structures. The latter pair includes a tapped cascade, which is a cascade of second order all-pole sections whose output is constructed as a weighted combination of signals tapped from the cascade. The second new structure is a modification of the tapped cascade that yields orthogonal signals at the taps of the cascade. It is shown that the tapped cascade provides the best overall performance in the respects noted above.
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According to the special demand of a separation facility,SeF_6 is selected as working midium.By dint of separation test in a separation facility,some separation characteristic parameters which are necessary for a cascade design are acquired.In the further study,a square cascade model is established,and the cascade separation characteristic of ~(74)Se is analyzed by the cascade theory.The studies indicate that it is feasible for separating ~(74)Se by the special separation facility.
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