Global Enhancement but Local Suppression in Feature Based Attention

Peer reviewedPublisher PD

Strategic Delegation in Experimental Markets

In this experiment, we analyze strategic delegation in a Cournot duopoly. Owners can choose among two different contracts which determine their managers' salaries. One contract simply gives managers incentives to maximize firm profits, while the second contract gives an additional sales bonus. Although theory predicts the second contract to be chosen, it is only rarely chosen in the experimental markets. This behavior is rational given that managers do not play according to the subgame perfect equilibrium prediction when asymmetric contracts are given.Strategic delegation, managerial incentives, experimental economics

Positron Tunnelling through the Coulomb Barrier of Superheavy Nuclei

We study beams of medium-energy electrons and positrons which obey the Dirac equation and scatter from nuclei with $Z > 100.$ At small distances the potential is modelled to be that of a charged sphere. A large peak is found in the probability of positron penetration to the origin for $Z \approx 184.$ This may be understood as an example of Klein tunnelling through the Coulomb barrier: it is the analogue of the Klein Paradox for the Coulomb potential.Comment: 3 figures, to be published in Physics Letters

Einfluss des Leguminosen-Managements auf die Anfälligkeit des Bodens gegen Erosion

Zusammenfassung In der Diskussion um die Umweltwirkungen des Ökologischen Landbaus wird davon aus-gegangen, dass die Bodenerosion durch längere Bodenbedeckung sowie durch bessere Aggregierung der Böden durch Wurzeln und organische Düngung verringert wird. In ei-nem Dauerversuch, der auf die Wirkungen des Leguminosen-Managements in verschiede-nen Fruchtfolgen ausgerichtet ist, wurde die Aggregatstabilität in der obersten Boden-schicht (0-5cm) untersucht und mit anderen Bodeneigenschaften sowie Indikatoren der Kohlenstoffbilanzierung korreliert. Es wurden deutliche Differenzen in der Aggregatstabi-lität zwischen den verschiedenen Fruchtfolgen gefunden. Der bodenwirksame Kohlenstoff aus dem frischen, eingearbeiteten Pflanzenmaterial (Wurzeln, Stoppelreste, Gründüngung) hatte die engste Korrelation zur Aggregatstabilität

Severe Weight Loss and Its Association with Fatigue in Old Patients at Discharge from a Geriatric Hospital

Although malnutrition is frequent in the old, little is known about its association with fatigue. We evaluated the relation of self-reported severe weight loss with fatigue and the predictors for fatigue in old patients at hospital discharge. Severe weight loss was defined according to involuntary weight loss ≥5% in the last three months. We determined fatigue with the validated Brief Fatigue Inventory questionnaire. The regression analyses were adjusted for age, sex, number of comorbidities, medications/day, and BMI. Of 424 patients aged between 61 and 98 y, 34.1% had severe weight loss. Fatigue was higher in patients with severe weight loss (3.7 ± 2.3 vs. 3.2 ± 2.3 points, p = 0.021). In a multinomial regression model, weight loss was independently associated with higher risk for moderate fatigue (OR:1.172, CI:1.026-1.338, p = 0.019) and with increased risk for severe fatigue (OR:1.209, CI:1.047-1.395, p = 0.010) together with the number of medications/day (OR:1.220, CI:1.023-1.455, p = 0.027). In a binary regression model, severe weight loss predicted moderate-to-severe fatigue in the study population (OR:1.651, CI:1.052-2.590, p = 0.029). In summary, patients with self-reported severe weight loss at hospital discharge exhibited higher fatigue levels and severe weight loss was an independent predictor of moderate and severe fatigue, placing these patients at risk for impaired outcome in the post-hospital period

Wirkungen des Ökologischen Landbaus auf Bodenerosion – Beitrag 2: Einfluss des Leguminosenmangements auf Merkmale der Bodenerodibilität

It is supposed that organic farming reduces soil water erosion due to a long soil coverage and soil aggregation by roots and organic manure. In a long term field trial\ud which is focused on the effect of legume management in different crop rotations soil aggregation in the top layer of 0-5 cm was tested and correlated with some other soil properties and indicators of carbon balances. There are differences in aggregate stability between the crop rotations. The incorporated plant material (roots, stubble residues, green manure) has the best effect on the stability of soil aggregates

Adam Smith and Ordoliberalism : On the Political Form of Market Liberty

In the context of the contemporary crisis of neoliberal political economy, the politics of austerity has reasserted the liberal utility of the state as the political authority of market freedom. This article argues that economy has no independent existence, and that instead, economy is a political practice. It examines the political economy of Adam Smith and the German ordoliberal tradition to decipher the character of the political in political economy and its transformation from Smith's liberal theory into neoliberal theology. Ordoliberalism emerged in the late 1920s at a time of a manifest crisis of political economy, and its argument was fundamental for the development of the neoliberal conception that free economy is matter of strong state authority. The conclusion argues with Marx that the state is the concentrated force of free economy

Tunneling spectra of submicron Bi2_2Sr2_2CaCu2_2O8+δ_{8+\delta} intrinsic Josephson junctions: evolution from superconducting gap to pseudogap

Tunneling spectra of near optimally doped, submicron Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ intrinsic Josephson junctions are presented, and examined in the region where the superconducting gap evolves into pseudogap. The spectra are analyzed using a self-energy model, proposed by Norman {\it et al.}, in which both quasiparticle scattering rate $\Gamma$ and pair decay rate $\Gamma_{\Delta}$ are considered. The density of states derived from the model has the familiar Dynes' form with a simple replacement of $\Gamma$ by $\gamma_+$ = ($\Gamma$ + $\Gamma_{\Delta}$)/2. The $\gamma_+$ parameter obtained from fitting the experimental spectra shows a roughly linear temperature dependence, which puts a strong constraint on the relation between $\Gamma$ and $\Gamma_{\Delta}$. We discuss and compare the Fermi arc behavior in the pseudogap phase from the tunneling and angle-resolved photoemission spectroscopy experiments. Our results indicate an excellent agreement between the two experiments, which is in favor of the precursor pairing view of the pseudogap.Comment: 7 pages, 6 figure

Magnetic excitations in the stripe phase of high-T_c superconductors

The magnetic excitations in the stripe phase of high-T_c superconductors are investigated in a model of spin ladders which are effectively coupled via charged stripes. Starting from the effective single-triplon model for the isolated spin ladder, the quasi-one-dimensional spin system can be described straightforwardly. Very good agreement is obtained with recent neutron scattering data on La_(15/8)Ba_(1/8)CuO_4 (no spin gap) and YBa_2Cu_3O_(6.6) (gapped). The signature of quasi-one-dimensional spin physics in a single-domain stripe phase is predicted.Comment: 3 pages, 3 figures included, submitted to the proceedings of JEMS 200

GANeRF: Leveraging Discriminators to Optimize Neural Radiance Fields

Neural Radiance Fields (NeRF) have shown impressive novel view synthesis results; nonetheless, even thorough recordings yield imperfections in reconstructions, for instance due to poorly observed areas or minor lighting changes. Our goal is to mitigate these imperfections from various sources with a joint solution: we take advantage of the ability of generative adversarial networks (GANs) to produce realistic images and use them to enhance realism in 3D scene reconstruction with NeRFs. To this end, we learn the patch distribution of a scene using an adversarial discriminator, which provides feedback to the radiance field reconstruction, thus improving realism in a 3D-consistent fashion. Thereby, rendering artifacts are repaired directly in the underlying 3D representation by imposing multi-view path rendering constraints. In addition, we condition a generator with multi-resolution NeRF renderings which is adversarially trained to further improve rendering quality. We demonstrate that our approach significantly improves rendering quality, e.g., nearly halving LPIPS scores compared to Nerfacto while at the same time improving PSNR by 1.4dB on the advanced indoor scenes of Tanks and Temples.Comment: Video: https://youtu.be/EUWW8nUxpl