High frequency titrations involving chelation with ethylenediaminetetraacetic acid: Complexation of thorium nitrate

High frequency titrations have confirmed the reacting ratio of thorium to ethylenediaminetctraacetic acid to be l to 1. It has also been shown that thorium can be determined by oscillometric titration using either the hydrogen release method or the direct titration technique. The method is especially interesting for the determination of small amounts of thorium in dilute solution.     

A resistance minimum and the electronic structures of some one-dimensional Pt-complexes at high pressures

The effect of pressure has been measured up to 650 kbar on the electrical resistance in six one-dimensional Pt-complexes, including two mixed valence ones. SrPt(CN)₄·2H₂O, MgPt(CN)₄·7H₂O and BaPt(CN)₄·4H₂O do not show a resistance minimum, contrary to other d⁸-metal complexes, suggesting a considerable contribution of π¹ orbitals of CN^- ligands to the conduction.     

Quasiparticle injection and disappearance of superconductivity in superconducting tunneling junctions

The destruction of superconductivity by heavy current injection in superconducting tunneling junctions is reported. The analysis based on Parker's modified heating theory is also presented.     

Pressure effect on adhesion

Zusammenfassung Unter der Voraussetzung von Verknüpfungen wird die Anfangsgeschwindigkeit der Adhäsion untersucht.Wenn Epoxyharz-Aminsysteme als Klebstoff gebraucht werden, ist die Beziehung zwischen Härtezeit und Anfangs-Bindefestigkeit theoretisch wie folgt gegeben:S(t)/S(t ₀ )=t+1. Dabei sindS(t) undS(t ₀) die Klebefestigkeit nach den Härtezeitent bzw.t ₀ ist ein Maß für das Ansteigen der Verknüpfungen, t=t–t₀.Die Beziehung zwischen Härtungsdruck und Verhältnis der Klebfestigkeiten lautet lnS(p)/S(p ₀ )=ln+·p. Wieder sind die Werte der FestigkeitenS aufp bzw.p ₀ auf die Drucke bezogen. und sind Konstanten.Die experimentellen Ergebnisse für das Kleben von Kupfer mit Epoxyharz-Aminsystemen bestätigen diese theoretischen Voraussagen.

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With 7 figures and 3 tables     

Coupling of a quasi-particle to the pairing vibrations

The intermediate coupling model of odd nuclei, where a nucleon is coupled to the surface vibration of an even system, has been successfully used in explaining various nuclear properties. In this paper, it is pointed out that a similar picture is applicable to improve the BCS approximation for seniority-one states in the pairing force model by considering coupling of a quasi-particle to the pairing normal modes. It is shown that this model is, in part, equivalent to the variational approach which takes the blocking effect into account. Several models are compared numerically.     

Number-conserving approach to the pairing-force model

The pairing-force model of finite spherical nuclei is studied in a way that does not violate the conservation of particle number. In the present model, the single-particle levels are first classified into two degenerate sets, and subsequently, the energy spacings in each set are taken into account by perturbation theory. Ground state energies of the even nickel, tin and lead isotopes are calculated and are found to be correct to within 300 keV by comparison with the exact solutions of the pairing hamiltonian obtained byKerman,Lawson, andMacFarlane.     

Japanese analytical instrument manufacturing industry

The production of analytical instrumentation in Japan has increased markedly in recent years. The percentage of this output which is exported has also increased, and reached 25% of total production in 1981.