No minimally reasonable collective-choice process can be strategy-proof

In this paper I will prove that every collective-choice process fulfilling certain mild requirements - notably a version of Nondictatorship and a very weak unanimity-reduction condition - is manipulable: none is strategy-proof. Gibbard and Satterthwaite have each proved a similar result just for resolute processes - ones yielding only single-member choice sets. My theorem does not assume resoluteness, which I criticize as an unreasonable requirement.     

Investigations on surface diffusion in sparingly soluble monolayers at the gas/liquid interface using radiotracer technique

Summary For creating favourable conditions for the experimental proof of surface-diffusion processes in sparingly soluble monolayers at the gas/liquid interface by means of radiotracer technique, possible factors of influence such as evaporation, desorption and convection were studied. From radiotracer measurements it followed that the share of evaporation and desorption in case of long-chained n-alkanols and n-alkane-carboxylic acids can be neglected. Even at correct experimental setup long-term movements of monolayer material occurred which, on the one hand, induced a lateral shifting of the boundary labelled/non-labelled, on the other a wavelike distribution of the monolayer material which initially had a statistically homogeneous distribution. The analysis of possible mechanical and thermal causes showed that these phenomena can be explained only by temperature-induced density instability in the volume phase of the trough. On this basis a model is proposed which explains the formation of compressed and expanded areas of monolayer material.

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Zusammenfassung Zur Schaffung günstiger Bedingungen für den experimentellen Nachweis von Oberflächendiffusionsvorgängen in schwerlöslichen Monoschichten an der Phasengrenze Gas/Flüssigkeit mit Hilfe der Radiotracertechnik wurden mögliche Einfluggrößen, wie Verdampfung, Desorption und Konvektion, untersucht. Aus Radiotracermessungen resultierte, dag der Anteil von Verdampfung und Desorption bei langkettigenn-Alkanolen undn-Alkansäuren vernachlässigt werden kann. Auch bei einwandfreier Versuchsdurchführung traten langzeitige Bewegungen des Monoschichtmaterials auf, die einmal zur lateralen Verschiebung der Grenze markiert/nichtmarkiert, zum anderen zur wellenförmigen Umverteilung des anfangs statistisch homogen verteilten Monoschichtmaterials führten. Die Analyse möglicher mechanischer und thermischer Ursachen ergab, daß diese Erscheinungen nur durch temperaturbedingte Dichteinstabilität in der Volumenphase des Troges erklärt werden können. Auf dieser Basis wird ein Modell vorgeschlagen, das die Ausbildung komprimierter und expandierter Bereiche des Monoschichtmaterials erklärt.

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With 6 figures and 1 table     

Sur la structure des algèbres de Kac,I

We elaborate on the relative situation of a Kac algebra and its dual, then, introducing three invariants we obtain a generalization of Heisenberg's commutation relations. Using the operator-valued weights introduced by U. Haagerup, we give a simpler definition for Kac algebras. As an application, we generalize the unicity of the left Haar measure on a locally compact group.     

Combining configurational entropy and self-concentration to describe the component dynamics in miscible polymer blends

We provide a new approach to describe the component segmental dynamics of miscible polymer blends combining the concept of chain connectivity, expressed in terms of the self-concentration, and the Adam-Gibbs model. The results show an excellent agreement between the prediction of our approach and the experimental data. The self-concentrations obtained yield length scales between 1 and 3.2 nm depending on the temperature, the flexibility of the polymer, expressed in terms of the Kuhn segment, and its concentration in the blends, at temperatures above the glass transition range of the blend.     

Acylaluminum dichlorides

Evidence has been obtained for the formation of acylaluminium dichlorides by transmetalation between Cp₂Zr(Cl)(acyl) and AlCl₃. They have been shown to be reactive toward electrophiles at both the carbon and the oxygen of the acyl group.     

Explicit calculation of a tricritical point in a Pauli paramagnetically limited superconductor

We extend the Maki-Tsuneto Green's function formulation for the critical magnetic field vs temperature of a Pauli paramagnetically limited thin film superconductor to include the field conjugate to the order parameter and show the system displays a tricritical point. We present numerical calculations within the mean field theory in the neighborhood of the tricritical point and describe an explicit experimental arrangement for producing an adjustable staggered field.     

Is energy self sufficiency a realistic goal for Canada?

Canada uses more energy per capita than any other major nation. The primary reasons are geography, climate, energy intensive industries and low energy prices. The country has substantial primary energy resources. This paper utilizes a dynamic energy policy model and a wide range of scenarios to investigate the possibility for long run energy self sufficiency and the related questions of timing, export possibilities and maintaining domestic energy prices below world levels.