A new operation policy--quasi-batch distillation for recovering infinitesimal amounts species existing in a mixture is presented. In quasi-batch distillation operation, feed is introduced with a constant flow rate ont...A new operation policy--quasi-batch distillation for recovering infinitesimal amounts species existing in a mixture is presented. In quasi-batch distillation operation, feed is introduced with a constant flow rate onto the feed stage of the column, and the flow rate of the distillate is the same as that of the feed, whereas the bottom product is withdrawn periodically. The behavior of quasi-batch distillation is simulated and analyzed through an example on heavy water separation. Comparing with continuous or batch distillation, the new operation policy is more reliable and efficient to achieve higher recovery of dilute component. This is especially suitable for separating small amount of precious species from large amount of raw material.展开更多
This paper interest rates （i.e., the recent macroeconomic presents an IS-MP model with the term structure of yield curve） and discusses some of its applications to activities and policy issues. Specifically, the mod...This paper interest rates （i.e., the recent macroeconomic presents an IS-MP model with the term structure of yield curve） and discusses some of its applications to activities and policy issues. Specifically, the model is employed to explain （1） why a steepening yield curve may signal the subsequent economic expansion, （2） why long-term zero interest rate policy （ZIRP） may not completely avoid recessions, but disables the yield curve from being inverted to signal the following economic recession, （3） how Operation Twist （OT） may help ease the recession, in particular, under ZIRP, and what limit it may face.展开更多
基金Supported by the National Natural Science Foundation of China (No. 20136010).
文摘A new operation policy--quasi-batch distillation for recovering infinitesimal amounts species existing in a mixture is presented. In quasi-batch distillation operation, feed is introduced with a constant flow rate onto the feed stage of the column, and the flow rate of the distillate is the same as that of the feed, whereas the bottom product is withdrawn periodically. The behavior of quasi-batch distillation is simulated and analyzed through an example on heavy water separation. Comparing with continuous or batch distillation, the new operation policy is more reliable and efficient to achieve higher recovery of dilute component. This is especially suitable for separating small amount of precious species from large amount of raw material.
文摘This paper interest rates （i.e., the recent macroeconomic presents an IS-MP model with the term structure of yield curve） and discusses some of its applications to activities and policy issues. Specifically, the model is employed to explain （1） why a steepening yield curve may signal the subsequent economic expansion, （2） why long-term zero interest rate policy （ZIRP） may not completely avoid recessions, but disables the yield curve from being inverted to signal the following economic recession, （3） how Operation Twist （OT） may help ease the recession, in particular, under ZIRP, and what limit it may face.
