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Showing papers by "University of Twente published in 1980"


Journal ArticleDOI
TL;DR: In this paper, five ammonia synthesis catalysts, mainly differing in potassium content, were prepared from a commercial doubly promoted iron catalyst, and the experimental reaction rates were fitted to the modified Temkin rate equation.

37 citations



Journal ArticleDOI
M. Bos1
TL;DR: In this article, a method for the rapid determination of double-layer capacitance is described, where an on-line computer is used to apply Kalousek-type waveforms to the electrochemical cell and to measure the accompanying current response.

15 citations


Journal ArticleDOI
M. Bos1
TL;DR: In chemical analysis, computerization can provide higher precision, higher speed and lower costs and the value of interactive systems in routine work is emphasized.

6 citations


Journal ArticleDOI
TL;DR: In this article, the solid-state conformation of copolymers of s-benzyl-L-aspartate [L-Asp(OBzl)] with L-leucine (L-Leu), L-alanine(L-Ala), l-valine, 0-8 mol %; l-Glu (OBzl), 3-10 mol %, and e-carbobenzoxy-L -lysine (Cbz-Lysine), 0-9 mol %.
Abstract: The solid-state conformation of copolymers of s-benzyl-L-aspartate [L-Asp(OBzl)] with L-leucine (L-Leu), L-alanine (L-Ala), L-valine (L-Val), γ-benzyl-L-glutamate [L-Glu(OBzl)], or e-carbobenzoxy-L-lysine (Cbz-L-Lys) has been studied by ir spectroscopy and circular dichroism (CD). The ir spectra in the region of the amide I and II bands and in the region of 700-250 cm-1 have been determined. The results from the ir studies are in good agreement with data obtained by CD experiments. Incorporation of the amino acid residues mentioned above into poly[L-Asp(OBzl)] induces a change from the left-handed into the right-handed α-helix. This conformational change for the poly[L-Asp(OBzl)] copolymers was observed in the following composition ranges: L-Leu, 0-15 mol %; L-Ala, 0-32 mol %; L-Val, 0-8 mol %; L-Glu(OBzl), 3-10 mol %; and Cbz-L-Lys, 0-9 mol %.

3 citations


Journal ArticleDOI
TL;DR: In this paper, a computer method for the determination of carbonate and hydroxide in concentrated (2.89 M) sodium chloride solutions is described, based on multiparametric curve-fitting and can also be applied to salts of dibasic acids with unknown equilibrium constants.

2 citations


Journal ArticleDOI
TL;DR: In this article, the stochastic control problem of a linear dynamical system with multiplicative noise and with incomplete and inaccurate observation, has been studied for quadratic performance criterion, and a suboptimal solution has been worked out when the observations are given only at discrete-time points.
Abstract: The stochastic control problem of a linear dynamical system with multiplicative noise and with incomplete and inaccurate observation, has been studied for quadratic performance criterion. A suboptimal solution, which is the best linear control based on the available observations, has been worked out when the observations are given only at discrete-time points.

2 citations


Journal ArticleDOI
TL;DR: In this article, it was shown that the molecular weight of polybromopropadiene increases with polymerization time until a steady value is reached, and that chain transfer must occur when a constant molecular weight has been reached.

1 citations