Ursachen von Stromsperren in Privathaushalten : empirische Ergebnisse aus der Allgemeinen Sozialberatung

In diesem Aufsatz wird untersucht, welche Merkmale Haushalte aufweisen, denen Stromsperren (Unterbrechungen der Stromversorgung wegen Zahlungsrückständen) angedroht wurden bzw. bei denen sie umgesetzt wurden und welche Bedeutung diese Merkmale relativ zueinander haben. Dazu wird erstmals ein Datensatz aus der Beratungspraxis des Deutschen Caritasverbandes mittels multipler logistischer Regression ausgewertet. Die empirische Untersuchung zeigt, dass Stromsperren und ihre Androhung häufig auftreten, wenn ein Haushalt bereits bestehende Schulden hat. Haushalte, die Grundsicherungsleistungen beziehen, sind überdurchschnittlich oft von der Androhung bzw. Umsetzung einer Stromsperre betroffen. Im Gegensatz zur Androhung einer Stromsperre kommt es überproportional häufig zur tatsächlichen Umsetzung einer Stromsperre, wenn die Betroffenen über ein besonders geringes Bildungsniveau verfügen sowie in Ein-Personen-Haushalten. Insgesamt stützen die Ergebnisse die These, dass die Problematik der Stromsperren einer herkömmlichen Verschuldungsproblematik ähnlich ist. Gegenmaßnahmen sollten daher nicht alleine auf das Einkommen oder die Stromkosten der Haushalte fokussieren, sondern müssen auch kognitive und psychologische Faktoren adressieren, die mit Ver- bzw. Überschuldung einhergehen

Effect of an optimised pelleted diet on Salmonella prevalence and pig productivity

The effect of an optimised, wheat based pelleted diet containing barley, sugar beet pulp and organic acids on Salmonella prevalence and pig productivity was investigated in two finisher herds. The optimised diet significantly reduced Salmonella seroprevalence compared to standard pelleted feed and meal feed. In contrast to previous studies, meal feed did not have a significant Salmonella reducing effect in this study. Meal diet but not the optimised diet had a significant negative effect on pig productivity, compared to the standard pelleted diet. Our results show that the optimised diet is a suitable alternative to wheat based pelleted feed or meal feed in reducing Salmonella prevalence in finisher pigs

Modeling the Dynamics of Long-Term Variability of Hydroclimatic Processes

The stochastic analysis, modeling, and simulation of climatic and hydrologic processes such as precipitation, streamflow, and sea surface temperature have usually been based on assumed stationarity or randomness of the process under consideration. However, empirical evidence of many hydroclimatic data shows temporal variability involving trends, oscillatory behavior, and sudden shifts. While many studies have been made for detecting and testing the statistical significance of these special characteristics, the probabilistic framework for modeling the temporal dynamics of such processes appears to be lacking. In this paper a family of stochastic models that can be used to capture the dynamics of abrupt shifts in hydroclimatic time series is proposed. The applicability of such ‘‘shifting mean models’ ’ are illustrated by using time series data of annual Pacific decadal oscillation (PDO) indices and annual streamflows of the Niger River. 1

Ultra-efficient frequency comb generation in AlGaAs-on-insulator microresonators

Recent advances in nonlinear optics have revolutionized integrated photonics, providing on-chip solutions to a wide range of new applications. Currently, state of the art integrated nonlinear photonic devices are mainly based on dielectric material platforms, such as Si₃N₄ and SiO₂. While semiconductor materials feature much higher nonlinear coefficients and convenience in active integration, they have suffered from high waveguide losses that prevent the realization of efficient nonlinear processes on-chip. Here, we challenge this status quo and demonstrate a low loss AlGaAs-on-insulator platform with anomalous dispersion and quality (Q) factors beyond 1.5 × 10⁶. Such a high quality factor, combined with high nonlinear coefficient and small mode volume, enabled us to demonstrate a Kerr frequency comb threshold of only ∼36 µW in a resonator with a 1 THz free spectral range, ∼100 times lower compared to that in previous semiconductor platforms. Moreover, combs with broad spans (>250 nm) have been generated with a pump power of ∼300 µW, which is lower than the threshold power of state-of the-art dielectric micro combs. A soliton-step transition has also been observed for the first time in an AlGaAs resonator

The 2500 yr long paleoseismological record of the Hazar Lake, East Anatolian fault, Turkey

Understanding the Irregularity of Seismic Cycles: A Case Study in Turke

Toxic metal enrichment and boating intensity: sediment records of antifoulant copper in shallow lakes of eastern England

Tributyltin (TBT), an aqueous biocide derived from antifouling paint pollution, is known to have impacted coastal marine ecosystems, and has been reported in the sediment of the Norfolk and Suffolk Broads, a network of rivers and shallow lakes in eastern England. In the marine environment, the 1987 TBT ban has resulted in expanded use of alternative biocides, raising the question of whether these products too have impacted the Broads ecosystem and freshwaters in general. Here we examine the lake sediment record in the Norfolk and Suffolk Broads for contamination by copper (Cu) (as an active biocide agent) and zinc (Zn) (as a component of booster biocides), to assess their occurrence and potential for causing environmental harm in freshwater ecosystems. We find that, after the introduction of leisure boating, there is a statistically significant difference in Cu enrichment between heavily and lightly boated sites, while no such difference exists prior to this time. At the heavily boated sites the onset of Cu enrichment coincides with a period of rapid increase in leisure boating. Such enrichment is maintained to the present day, with some evidence of continued increase. We conclude that Cu-based antifouling has measurably contaminated lakes exposed to boating, at concentrations high enough to cause ecological harm. Similar findings can be expected at other boated freshwater ecosystems elsewhere in the world

Direct characterization of a nonlinear photonic circuit's wave function with laser light

© The Author(s) 2018. Integrated photonics is a leading platform for quantum technologies including nonclassical state generation 1, 2, 3, 4, demonstration of quantum computational complexity 5 and secure quantum communications 6. As photonic circuits grow in complexity, full quantum tomography becomes impractical, and therefore an efficient method for their characterization 7, 8 is essential. Here we propose and demonstrate a fast, reliable method for reconstructing the two-photon state produced by an arbitrary quadratically nonlinear optical circuit. By establishing a rigorous correspondence between the generated quantum state and classical sum-frequency generation measurements from laser light, we overcome the limitations of previous approaches for lossy multi-mode devices 9, 10. We applied this protocol to a multi-channel nonlinear waveguide network and measured a 99.28±0.31% fidelity between classical and quantum characterization. This technique enables fast and precise evaluation of nonlinear quantum photonic networks, a crucial step towards complex, large-scale, device production