Finite volume effects and quark mass dependence of the N(1535) and N(1650)

For resonances decaying in a finite volume, the simple identification of state and eigenvalue is lost. The extraction of the scattering amplitude is a major challenge as we demonstrate by extrapolating the physical S_{11} amplitude of pion-nucleon scattering to the finite volume and unphysical quark masses, using a unitarized chiral framework including all next-to-leading order contact terms. We show that the pole movement of the resonances N(1535)1/2^- and N(1650)1/2^- with varying quark masses is non-trivial. In addition, there are several strongly coupled S-wave thresholds that induce a similar avoided level crossing as narrow resonances. The level spectrum is predicted for two typical lattice setups, and ways to extract the amplitude from upcoming lattice data are discussed.Comment: 8 pages, 5 .eps figure

Patients with Borderline Personality Disorder Not Participating in an RCT: Are They Different?

Background: Despite the notion that randomized controlled trials are regarded as the gold standard in psychotherapy research, questions about their generalizability have been raised. This paper focuses on the differences between participants and eligible nonparticipants of a randomized controlled trial for patients with borderline personality disorder (BPD). Sampling and Methods: One hundred forty-two patients were screened, and 122 were found eligible for study participation. Out of these, 64 patients (52.5%) gave informed consent and were included in the study. Results: The 58 eligible nonparticipants showed a lower level of functioning (global assessment of functioning score), had a history of more outpatient treatment attempts and were living alone more often. Regarding acute symptoms and severity of BPD as indexed by suicide attempts, inpatient treatments, substance abuse and history of trauma, no differences between the groups could be detected. Moreover, participants showed significantly more eating disorders, whereas nonparticipants presented more affective and anxiety disorders. Conclusions: The results indicate that lower psychosocial functioning and comorbid affective and anxiety disorders decrease BPD patients' willingness to participate in an RCT. Copyright (C) 2010 S. Karger AG, Base

Characterizing flood impact on Swiss floodplains using inter-annual time series of satellite imagery

Pressure on the biodiversity of ecosystems along many rivers is growing continuously due to the increasing number of hydropower facilities regulating downstream flow and sediment regimes. Despite a thorough understanding of the shortterm processes and interactions at this hydro-biosphere interface, long-term analyses of the impacts on floodplain dynamics are lacking. We used inter-annual Landsat 4, 5, 7 and 8 time series to analyze the effects of hydrological events on floodplain vegetation in four mountainous floodplains in the Swiss Alps. Using a spectral mixture analysis approach, we demonstrate that the floodplain vegetation dynamics of mountainous rivers can be recovered at a spatial resolution of 30 meters. Our results suggest that interactions between floods and floodplain vegetation are complex and not exclusively related to flood magnitude. Of the four reaches analyzed, only data gathered along the submountainous reach with a quasi-natural flow regime show a clear link between remotely sensed vegetation indices and floods. In addition, our 29-year time series shows a continuous upward trend in vegetation indices along the floodplains, strongest in the reaches affected by hydropower facilities. The approach presented in this study can be easily replicated in other mountain ranges by providing available flow data to verify the impact of hydropower on floodplain vegetation dynamics

Drohnen-gestützte und terrestrische Wärmebilder zur Beurteilung der Fliessgewässer-Temperatur

Terrestrische und drohnen-gestützte Messungen mit thermischem Infrarot (TIR) sind effektiv zur zeitlich-räumlich hochaufgelösten Quantifizierung von Längs- und Quertemperaturunterschieden in gut durchmischten Fliessgewässern. Bei der TIR-Erfassung und -Analyse müssen allerdings verschiedene atmosphärische und andere Umwelteinflüsse berücksichtigt sowie die TIR-Anwendung zur genauen Bestimmung der absoluten Temperatur kritisch betrachtet werden

Physics Opportunities with Meson Beams

Over the past two decades, meson photo- and electro-production data of unprecedented quality and quantity have been measured at electromagnetic facilities worldwide. By contrast, the meson-beam data for the same hadronic final states are mostly outdated and largely of poor quality, or even nonexistent, and thus provide inadequate input to help interpret, analyze, and exploit the full potential of the new electromagnetic data. To reap the full benefit of the high-precision electromagnetic data, new high-statistics data from measurements with meson beams, with good angle and energy coverage for a wide range of reactions, are critically needed to advance our knowledge in baryon and meson spectroscopy and other related areas of hadron physics. To address this situation, a state of-the-art meson-beam facility needs to be constructed. The present paper summarizes unresolved issues in hadron physics and outlines the vast opportunities and advances that only become possible with such a facility.Comment: 46 pages, 10 figures, 4 table

s-wave pion nucleon scattering lengths from pi N, pionic hydrogen, and deuteron data

The isoscalar and isovector scattering lengths (b(0),b(1)) are determined using a unitarized coupled channel approach based on chiral Lagrangians. Using experimental values of pionic hydrogen and deuterium as well as low energy piN scattering data, the free parameters of the model are calculated. Isospin violation is incorporated to a certain extent by working with physical particle masses. For the deuterium scattering length a(pi)(-)d new significant corrections concerning real and imaginary parts are evaluated, putting new constraints from pi(-)d scattering on the values of (b(0),b(1)). In particular, dispersion corrections, the influence of the Delta(1232) resonance, crossed terms and multiple scattering in a Faddeev approach are considered

Enhanced ferrimagnetism in auxetic NiFe2O4 in the crossover to the ultrathin film limit

We investigate the sensitive interplay between magnetic, electronic and structural properties in the ferrimagnetic oxide NiFe2O4. Emphasis is placed on the impact of reduced dimensionality in the crossover from bulk-like to ultrathin films. We observed an enhanced saturation magnetization $M_S$ for ultrathin NiFe2O4 films on Nb-SrTiO3 (001) substrates that co-occurs with a reduced out-of-plane lattice constant under compressive in-plane epitaxial strain. We found a bulk-like cationic coordination of the inverse spinel lattice independent of the NiFe2O4 film thickness -- thus ruling out a cationic inversion that nominally could account for an enhanced $M_S$. Our study instead uncovers a reduction of the unit cell volume, i.e. an auxetic behavior in ultrathin NiFe2O4 films, which may result in an enhanced magnetic exchange caused by an increased interatomic electronic localization.Comment: 8 pages, 6 figure