Jacob Steendahl Nielsen

Lean Maturity, Lean Sustainability

Although lean is rapidly growing in popularity, its implementation is far from problem free and companies may experience difficulties sustaining long term success. In this paper, it is suggested that sustainable lean requires attention to both performance improvement and capability development. A framework for describing levels of lean capability is presented, based on a brief review of the literature and experiences from 12 Danish companies currently implementing lean. Although still in its emerging phase, the framework contributes to both theory and practice by describing developmental stages that support lean capability development and consequently, lean sustainability.

Identification of band‐gap states by deep level transient spectroscopy on radioactive probes: The case of Au and Pt in silicon

The deep level transient spectroscopy technique has been applied to silicon doped with radioactive impurities. The disappearance or appearance of features in the spectra following the transmutation of the incorporated radioactive atoms identifies an impurity involved in the centers observed. Results for Au and Pt diffused in Si are presented showing that Au occupies the same lattice position as Pt, which is known from electron paramagnetic resonance measurements to be substitutional.

Collaborative improvement : interplay but not a game

Collaboration literally means working together. Collaborative improvement is an extension of continuous improvement and can be defined as a purposeful inter-company interactive process that focuses on continuous incremental innovation aimed at enhancing the collaboration’s overall performance. Developing collaborative improvement is a protracted and difficult process. Previous research has identified a number of factors affecting that process and suggested that it is not so much the individual factors, but rather their interplay that determines the successful development of collaborative improvement. This article reports research aimed at developing a deeper understanding of that interplay. Ten relationships between ten factors are presented and discussed. It appears that vision, approach, trust and commercial reality are the strongest factors. These factors are, however, influenced by, or affect the other factors, notably national culture, partner characteristics and competences, the use of power, individual behaviour and commitment. The way this interplay develops varies from case to case and has great influence on the development of collaborative improvement.

Identification of band gap states by deep level transient spectroscopy on radioactive probes

Abstract The deep level transient spectroscopy technique has been applied to silicon doped with radioactive isotopes of the elements Au, Pt, Ir, and Os. The disappearance or appearance of features in the spectra as the incorporated radioactive atoms transmute unambiguously identifies an impurity involved in the centers observed.

Laser cooling of stored ions in ASTRID: a storage ring for ions and electrons

Abstract A small storage ring, ASTRID, for ions and electrons has been constructed. It is a dual-purpose machine, serving as a storage ring for either ions or electrons for synchrotronradiation production. The ring has for more than one year been operational with ions and has recently been commissioned for electron storage. Both these running modes will be described as well as results given from the first experiments with laser cooled ions. Finally, prospects for experiments with superhigh mass and isotope selectivity will be discussed.

Realization of space charge dominated stored beams by laser cooling

enables us to generate photon correlation spectra (i.e., spectra of the time intervalsbetween detected photons), which can be compared directly with the experimentally observed spectra. Also the effect ofimperfections such as misalignment of the magnetic field relative to the trap axis can be investigated. Figure 1 shows the laser cooling of a single ion in the trap. The laser beam comes in from the left, and it can be seenthat the equilibrium position of the ion is shifted by the radiation pressure to a point closer to the laser than the centre of the trap. This counter-intuitive behaviour results from the fact that the quadrupole potential has a maximum in the radial plane at the centre of the trap (which also leads to the magnetron motion being unstable). Figure 2 shows the positions offive laser-cooled ions in a crystal configuration. As the whole structure is rotating, the plot is performed in the rotating frame in which the crystal is stationary. Figure 3 gives a simulation of the expected photon correlation spectrum in the form that is measured in our experiments. In this case there are two ions in the trap. The deep modulation seen corresponds to twice the magnetron frequency. At the conference we will present the latest results of the simulations, together MCA counts