Data-driven Design of Engineering Processes with COREPROModeler

Enterprises increasingly demand IT support for the coordination of their engineering processes, which often consist of hundreds up to thousands of sub-processes. From a technical viewpoint, these sub-processes have to be concurrently executed and synchronized considering numerous interdependencies. So far, this coordination has mainly been accomplished manually, which has resulted in errors and inconsistencies. In order to deal with this problem, we have to better understand the interdependencies between the subprocesses to be coordinated. In particular, we can benefit from the fact that sub-processes are often correlated to the assembly of a product (represented by a product data structure). This information can be utilized for the modeling and execution of so-called data-driven process structures. In this paper, we present the COREPRO demonstrator that supports the data-driven modeling of these process structures. The approach explicitly establishes a close linkage between product data structures and engineering processes

Systematic Mapping of the Hubbard Model to the Generalized t-J Model

The generalized t-J model conserving the number of double occupancies is constructed from the Hubbard model at and in the vicinity of half-filling at strong coupling. The construction is realized by a self-similar continuous unitary transformation. The flow equation is closed by a truncation scheme based on the spatial range of processes. We analyze the conditions under which the t-J model can be set up and we find that it can only be defined for sufficiently large interaction. There, the parameters of the effective model are determined.Comment: 16 pages, 13 figures included. v2: Order of sections changed. Calculation and discussion of apparent gap in Section IV.A correcte

Prewetting transition on a weakly disordered substrate : evidence for a creeping film dynamics

We present the first microscopic images of the prewetting transition of a liquid film on a solid surface. Pictures of the local coverage map of a helium film on a cesium metal surface are taken while the temperature is raised through the transition. The film edge is found to advance at constant temperature by successive avalanches in a creep motion with a macroscopic correlation length. The creep velocity varies strongly in a narrow temperature range. The retreat motion is obtained only at much lower temperature, conforming to the strong hysteresis observed for prewetting transition on a disordered surface. Prewetting transition on such disordered surfaces appears to give rise to dynamical phenomena similar to what is observed for domain wall motions in 2D magnets.Comment: 7 pages, 3 figures, to be published in Euro.Phys.Let

Survival of branching random walks in random environment

We study survival of nearest-neighbour branching random walks in random environment (BRWRE) on ${\mathbb Z}$. A priori there are three different regimes of survival: global survival, local survival, and strong local survival. We show that local and strong local survival regimes coincide for BRWRE and that they can be characterized with the spectral radius of the first moment matrix of the process. These results are generalizations of the classification of BRWRE in recurrent and transient regimes. Our main result is a characterization of global survival that is given in terms of Lyapunov exponents of an infinite product of i.i.d. $2\times 2$ random matrices.Comment: 17 pages; to appear in Journal of Theoretical Probabilit

Exact calculation of the ground-state dynamical spin correlation function of a S=1/2 antiferromagnetic Heisenberg chain with free spinons

We calculate the exact dynamical magnetic structure factor S(Q,E) in the ground state of a one-dimensional S=1/2 antiferromagnet with gapless free S=1/2 spinon excitations, the Haldane-Shastry model with inverse-square exchange, which is in the same low-energy universality class as Bethe's nearest-neighbor exchange model. Only two-spinon excited states contribute, and S(Q,E) is found to be a very simple integral over these states.Comment: 11 pages, LaTeX, RevTeX 3.0, cond-mat/930903

Ocorrência de tefritídeos em Passiflora caerulea em Pelotas e Capão do Leão, RS, Brasil.

O objetivo do estudo foi determinar a(s) espécie(s) de tefritídeo(s) coletado(s) em P. caerulea

Primeiro relato de Drosophila suzukii (Diptera: Drosophilidae) em frutos de araçá e pitanga em municípios da região sul do Rio Grande do Sul, Brasil.

O objetivo do estudo foi relatar a ocorrência de D. suzukii em frutíferas mirtáceas em municípios da região sul do Rio Grande do Sul, Brasil

Evaluation of universal newborn hearing screening in Switzerland 2012 and follow-up data for Zurich

BACKGROUND: The European Consensus Statement of Neonatal Hearing recommended universal newborn hearing screening (UNHS) in 1998. UNHS was introduced in Switzerland in 1999 under the auspices of a "Swiss Working Group Hearing Screening in Newborns". The aim of this study was to evaluate the number of newborns being screened and consequently followed-up in Switzerland for the year 2012. METHODS: Postal questionnaires were sent to all registered maternity clinics and birth-centres in Switzerland. To evaluate follow-up of newborns failing the screening process, a retrospective consecutive cohort analysis of newborns failing screening at the University Hospital Zurich between 2005 and 2010 was performed. RESULTS: A total of 102/110 (92.7%) maternity clinics and 1/14 (7.1%) birth-centres routinely performed UNHS. When weighted according to the number of births in the varying locations, 97.9% of all newborn received hearing screening. At the University Hospital of Zurich, 253/12,080 (2.1%) newborns failed the screening test and in 15/253 (6%) a relevant bilateral hearing impairment was found. This makes an overall incidence of congenitally relevant hearing loss of 0.12%. Unfortunately, 33/253 (13%) of newborns with failed screening were lost to follow-up. CONCLUSION: UNHS is well-established in Switzerland and the vast majority of newborns are screened. However, follow-up of failed screens is disappointing. Further measures need to be taken to improve follow up

Universal spectral form factor for chaotic dynamics

We consider the semiclassical limit of the spectral form factor $K(\tau)$ of fully chaotic dynamics. Starting from the Gutzwiller type double sum over classical periodic orbits we set out to recover the universal behavior predicted by random-matrix theory, both for dynamics with and without time reversal invariance. For times smaller than half the Heisenberg time $T_H\propto \hbar^{-f+1}$, we extend the previously known $\tau$-expansion to include the cubic term. Beyond confirming random-matrix behavior of individual spectra, the virtue of that extension is that the ``diagrammatic rules'' come in sight which determine the families of orbit pairs responsible for all orders of the $\tau$-expansion.Comment: 4 pages, 1 figur