Showing papers by "National Cheng Kung University published in 1974"
TL;DR: Packing of packing materials in a continuous-type thermal diffusion column substantially increases the separation efficiency by reducing the remixing effect as mentioned in this paper, and a significant improvement in separation over the achieved by an open column was obtained by employing a packed column with packing materials having the best value of permeability.
35 citations
TL;DR: In this article, the optimal feedback control law with respect to the quadratic performance criterion gives the conventional proportional-integral-derivative (PID) control, and some comparisons between the weighting factors of the Quadratic criterion and the parameters of the PID controller are given.
Abstract: By the introduction of the time integral of the output variable of a second-order system, the optimal feedback control law with respect to the quadratic performance criterion gives the conventional proportional-integral-derivative (PID) control. Some comparisons between the weighting factors of the quadratic criterion and the parameters of the PID controller are given. The values of the weighting factors corresponding to the classical methods of Cohen-Coon and Ziegler-Nichols are calculated ; negative values of the weighting factors are obtained.
25 citations
TL;DR: In this paper, a mathematical model has been proposed for the isotopic exchange reaction between insoluble salt particle and ion in liquid solution and the exchange equation to predict exchange fraction as a function of time, has been derived for the mechanism containing surface exchange reaction and intraparticle diffusion.
4 citations
TL;DR: In this article, the electron transfer coefficients, rate constants of electro-reduction and electro-oxidation, and polarographic overpotentials of uranyl-pamoate complex in dimethyl sulfoxide solution were determined.
3 citations
TL;DR: The reaction of excess dimethyl sulfoxide with ethyl bromoacetate has been shown to produce ethyl glyoxylate, hydrogen bromide, and Dimethyl sulfide as mentioned in this paper.
Abstract: The reaction of excess dimethyl sulfoxide with ethyl bromoacetate has been shown to produce ethyl glyoxylate, hydrogen bromide, and dimethyl sulfide. The yield of glyoxylate at first was reduced because the dimethyl sulfide reacted with bromoacetate to form trimethylsulfonium bromide and ethyl (methylmercapto) acetate, presumably via carbethoxymethyldimethylsulfonium bromide. These side reactions were diminished in a thin-film reactor, but the result was not satisfiable, the yield was 51%, and the side reactions were prevented by addition of methyl bromide, which rapidly consumed the dimethyl sulfide with formation of trimethylsulfonium bromide. Addition of 1, 2-epoxy-3-phenoxypropane removed the hydrogen bromide, thereby preventing the deleterious effects casued by its reduction of dimethyl sulfoxide to dimethyl sulfide. In this way has been developed a convenient preparation of ethyl glyoxylate in yields averaging about 70%. Identification and stoichiometry of the reaction products are presented.
2 citations
01 Jan 1974
TL;DR: In this article, two ladder-structure recurrence formulas have been suggested for the analysis of a nonuniform distributed network and an array has been established to form the approximate circuit polynomials in the S domain for studying pole-zero behaviours of this network.
Abstract: Two ladder-structure recurrence formulas have been suggested for the analysis of a nonuniform distributed network. An array has been established to form the approximate circuit polynomials in the S domain for studying pole-zero behaviours of this network.
1 citations