We report on the first experimental observation of bright matter wave solitons for 87Rb atoms with repulsive atom-atom interaction. This counterintuitive situation arises inside a weak periodic potential, where anomalous dispersion can be realized at the Brillouin zone boundary. If the coherent atomic wave packet is prepared at the corresponding band edge, a bright soliton is formed inside the gap. The strength of our system is the precise control of preparation and real time manipulation, allowing the systematic investigation of gap solitons.

We report the first experimental observation of nonlinear self-trapping of Bose-condensed 87 Rb atoms in a one dimensional waveguide with a superimposed deep periodic potential . The trapping effect is confirmed directly by imaging the atomic spatial distribution. Increasing the nonlinearity we move the system from the diffusive regime, characterized by an expansion of the condensate, to the nonlinearity dominated self-trapping regime, where the initial expansion stops and the width remains finite. The data are in quantitative agreement with the solutions of the corresponding discrete nonlinear equation. Our results reveal that the effect of nonlinear self-trapping is of local nature, and is closely related to the macroscopic self-trapping phenomenon already predicted for double-well systems.

We demonstrate the control of the dispersion of matter wave packets utilizing periodic potentials. This is analogous to the technique of dispersion management known in photon optics. Matter wave packets are realized by Bose-Einstein condensates of 87Rb in an optical dipole potential acting as a one-dimensional waveguide. A weak optical lattice is used to control the dispersion relation of the matter waves during the propagation of the wave packets. The dynamics are observed in position space and interpreted using the concept of effective mass. By switching from positive to negative effective mass, the dynamics can be reversed. The breakdown of the approximation of constant, as well as experimental signatures of an infinite effective mass are studied.

Research has established that alcohol advertising,like that for tobacco and fast food,influences behaviour. It encourages young people to drink alcohol sooner and in greater quantities. From a public health perspective, advertising of alcohol should clearly be limited. The United Kingdom has opted for a system of self regulatory controls that focuses primarily on the content of advertisements, with some limitations on the channels that can be used. As part of its alcohol inquiry, the House of Commons health select committee wanted to explore the success of self regulation. It obtained a large number of internal marketing documents from alcohol producers and their communications agencies in order to examine the thinking and strategic planning that underpin alcohol advertising and hence show not just what advertisers are saying, but why they are saying it. Here we present the key insights to emerge

Abstract:Purpose: This paper discusses consumer driven value creation (value-in-use) across three different marketing logics: product dominant logic (PDL), service dominant logic (SDL) and consumer dominant logic (CDL). PDL conceptualises value as created by firms and delivered to consumers through products. SDL frames consumer value as a function of direct provider-consumer interaction, or consumer driven chains of action indirectly facilitated by the provider. Recently the research focus has been turning to consumer dominant value creation. While there is agreement on the significance of this phenomenon, there is disagreement over whether consumer dominant value creation is an extension of SDL or calls for a distinct CDL. The purpose of this paper is to provide an analysis of the ontological and semantic foundations of consumer dominant value creation to clarify the extent to which the call for a distinct CDL is justified.Approach: This is a conceptual paper, which is informed by five cases of consumer dominance. The cases are used to clarify rather than verify the analysis of the ontological and semantic underpinnings of consumer dominant value creation. Findings:The ontological and semantic analysis demonstrates that PDL and SDL have insufficient explanatory power to accommodate substantial aspects of consumer dominant value creation. By implication, this supports the call for a distinct CDL.Originality: This paper contributes to the ongoing theoretical debate over the explanatory power of SDL by demonstrating that SDL is unable to accommodate important ontological and semantic aspects of consumer driven value creation.