Spherical Hartree-Fock calculations with linear momentum projection before the variation.Part II: Spectral functions and spectroscopic factors

The hole--spectral functions and from these the spectroscopic factors have been calculated in an Galilei--invariant way for the ground state wave functions resulting from spherical Hartree--Fock calculations with projection onto zero total linear momentum before the variation for the nuclei 4He, 12C, 16O, 28Si, 32S and 40Ca. The results are compared to those of the conventional approach which uses the ground states resulting from usual spherical Hartree--Fock calculations subtracting the kinetic energy of the center of mass motion before the variation and to the results obtained analytically with oscillator occupations.Comment: 16 pages, 22 postscript figure

A Multi-Configuration Mixing Approach with Symmetry-Projected Complex Hartree-Fock-Bogoliubov Determinants

A multi-configuration mixing approach built on essentially complex, symmetry-projected Hartree-Fock-Bogoliubov (HFB) mean fields is introduced. The mean fields are obtained by variation after projection. The configuration space consists out of the symmetry-projected HFB vacuum and the symmetry-projected two-quasiparticle excitations for even, and the symmetry-projected one-quasiparticle excitations for odd A systems. The underlying complex HFB transformations are assumed to be time-reversal invariant and axially symmetric. The model allows nuclear structure calculations in large model spaces with arbitrary two-body interactions. The approach has been applied to $^{20}$Ne and $^{22}$Ne. Good agreement with the exact shell model results and considerable improvement with respect to older calculations, in which only real HFB transformations were admitted, is obtained.Comment: 30 pages LaTeX file, 4 Postscript figure

French study on Quality and Safety of Organic Food (AFSSA 2003 Evaluation nutritionnelle et sanitaire des aliments issus de l’agriculture biologique)

The presentations summarises the results of a study on organic farming and food quality published 2003 in France. Agence française de sécurité sanitaire des aliments (AFSSA) (2003): Evaluation nutritionnelle et sanitaire des aliments issus de l’agriculture biologique. AFSSA, F-94701 Maisons-Alfort, France These Conclusions of the study are: · Confirmation of most of the findings in other similar studies · Interesting findings with regard to health promoting compounds · More studies are needed (consumption studies) · Several negative prejudgements about safety of organic food have not been confirmed · Regarding food safety issues: in some areas more monitoring might be needed · The system approach of Organic Farming is recognized as a potential model for more sustainable food safety strategie

Distinguishing Types of ‘Economic Abuses’: A Three-Dimensional Model

Is international criminal law adequate in respect of ‘economic abuses’ such as corporate complicity in human rights abuses or harm arising through the exploitation of resources from conflict-affected areas? Attempts to assess the adequacy of international criminal law to deal with ‘economic abuses’ have given rise to a complex and multi-layered debate. Authors have analysed a range of different phenomena, making it challenging to generalise conclusions on the suitability of existing international criminal law. Against this background, it is crucial to distinguish different types of ‘economic abuses’ if we are to assess the adequacy of international criminal law to address them. To do so, I propose a three-dimensional model to disentangle the various categories of ‘economic abuses’. Depending on whether the actor, the harmful activity, and the affected legal interests are economic or non-economic, legally distinct types of ‘economic abuses’ can be discerned. Through exploring three specific constellations, the article demonstrates that the adequacy of international criminal law varies significantly for the various types of ‘economic abuses’. The model aims to serve as an analytical entry point to distinguish the nature and extent of the legal challenges in a factual scenario and contributes to the elaboration of nuanced and meaningful conclusions on the relative adequacy of international criminal law in relation to ‘economic abuses’

Some recent results and open problems on sets of lengths of Krull monoids with finite class group

Some of the fundamental notions related to sets of lengths of Krull monoids with finite class group are discussed, and a survey of recent results is given. These include the elasticity and related notions, the set of distances, and the structure theorem for sets of lengths. Several open problems are mentioned