Do Eurozone Countries Cheat with Their Budget Deficit Forecasts?

We estimate the political economy determinants of budget deficit forecast errors. Since the adoption of the Stability Pact, Eurozone governments have manipulated forecasts before elections. The political orientation and the institutional design of governments also affects the quality of forecasts.Fiscal policy, Budget deficit, Forecast error, Electoral cycles

Correlations and Counting Statistics of an Atom Laser

We demonstrate time-resolved counting of single atoms extracted from a weakly interacting Bose-Einstein condensate of $^{87}$Rb atoms. The atoms are detected with a high-finesse optical cavity and single atom transits are identified. An atom laser beam is formed by continuously output coupling atoms from the Bose-Einstein condensate. We investigate the full counting statistics of this beam and measure its second order correlation function $g^{(2)}(\tau)$ in a Hanbury Brown and Twiss type experiment. For the monoenergetic atom laser we observe a constant correlation function $g^{(2)}(\tau)=1.00\pm0.01$ and an atom number distribution close to a Poissonian statistics. A pseudo-thermal atomic beam shows a bunching behavior and a Bose distributed counting statistics

Fahrdynamikoptimierung mittels Torque Vectoring bei einem bauraumoptimierten Elektrofahrzeug

Durch bauraumoptimierte Anordnung der Antriebskomponenten eines Elektrofahrzeugs können sich unkonventionelle Achslasten ergeben, welche in der Fahrdynamikauslegung berücksichtigt werden müssen. Die BMW Group Forschung und Technik entwickelt zusammen mit dem Deutschen Zentrum für Luft- und Raumfahrt (DLR) und dem Lehrstuhl für Regelungs- und Steuerungssysteme am Karlsruher Institut für Technologie (KIT) ein Torque-Vectoring-Regelungskonzept. Trotz der fahrdynamischen Herausforderung hoher Hinterachslasten wird dadurch ein ansprechendes und sicheres Fahrverhalten erzielt

Hybrid apparatus for Bose-Einstein condensation and cavity quantum electrodynamics: Single atom detection in quantum degenerate gases

We present and characterize an experimental system in which we achieve the integration of an ultrahigh finesse optical cavity with a Bose-Einstein condensate (BEC). The conceptually novel design of the apparatus for the production of BECs features nested vacuum chambers and an in-vacuo magnetic transport configuration. It grants large scale spatial access to the BEC for samples and probes via a modular and exchangeable "science platform". We are able to produce \87Rb condensates of five million atoms and to output couple continuous atom lasers. The cavity is mounted on the science platform on top of a vibration isolation system. The optical cavity works in the strong coupling regime of cavity quantum electrodynamics and serves as a quantum optical detector for single atoms. This system enables us to study atom optics on a single particle level and to further develop the field of quantum atom optics. We describe the technological modules and the operation of the combined BEC cavity apparatus. Its performance is characterized by single atom detection measurements for thermal and quantum degenerate atomic beams. The atom laser provides a fast and controllable supply of atoms coupling with the cavity mode and allows for an efficient study of atom field interactions in the strong coupling regime. Moreover, the high detection efficiency for quantum degenerate atoms distinguishes the cavity as a sensitive and weakly invasive probe for cold atomic clouds

Observing the Formation of Long-range Order during Bose-Einstein Condensation

We have experimentally investigated the formation of off-diagonal long-range order in a gas of ultracold atoms. A magnetically trapped atomic cloud prepared in a highly nonequilibrium state thermalizes and thereby crosses the Bose-Einstein condensation phase transition. The evolution of phase coherence between different regions of the sample is constantly monitored and information on the spatial first-order correlation function is obtained. We observe the growth of the spatial coherence and the formation of long-range order in real time and compare it to the growth of the atomic density. Moreover, we study the evolution of the momentum distribution during the nonequilibrium formation of the condensate.Comment: 4 pages, 4 figure

A genetic validation study reveals a role of vitamin D metabolism in the response to interferon-alfa-based therapy of chronic hepatitis C

Background: To perform a comprehensive study on the relationship between vitamin D metabolism and the response to interferon-α-based therapy of chronic hepatitis C. Methodology/Principal Findings: Associations between a functionally relevant polymorphism in the gene encoding the vitamin D 1α-hydroxylase (CYP27B1-1260 rs10877012) and the response to treatment with pegylated interferon-α (PEG-IFN-α) and ribavirin were determined in 701 patients with chronic hepatitis C. In addition, associations between serum concentrations of 25-hydroxyvitamin D3 (25[OH]D3) and treatment outcome were analysed. CYP27B1-1260 rs10877012 was found to be an independent predictor of sustained virologic response (SVR) in patients with poor-response IL28B genotypes (15% difference in SVR for rs10877012 genotype AA vs. CC, p = 0.02, OR = 1.52, 95% CI = 1.061–2.188), but not in patients with favourable IL28B genotype. Patients with chronic hepatitis C showed a high prevalence of vitamin D insufficiency (25[OH]D3<20 ng/mL) during all seasons, but 25(OH)D3 serum levels were not associated with treatment outcome. Conclusions/Significance: Our study suggests a role of bioactive vitamin D (1,25[OH]2D3, calcitriol) in the response to treatment of chronic hepatitis C. However, serum concentration of the calcitriol precursor 25(OH)D3 is not a suitable predictor of treatment outcome

Cavity QED with a Bose-Einstein condensate

Cavity quantum electrodynamics (cavity QED) describes the coherent interaction between matter and an electromagnetic field confined within a resonator structure, and is providing a useful platform for developing concepts in quantum information processing. By using high-quality resonators, a strong coupling regime can be reached experimentally in which atoms coherently exchange a photon with a single light-field mode many times before dissipation sets in. This has led to fundamental studies with both microwave and optical resonators. To meet the challenges posed by quantum state engineering and quantum information processing, recent experiments have focused on laser cooling and trapping of atoms inside an optical cavity. However, the tremendous degree of control over atomic gases achieved with Bose-Einstein condensation has so far not been used for cavity QED. Here we achieve the strong coupling of a Bose-Einstein condensate to the quantized field of an ultrahigh-finesse optical cavity and present a measurement of its eigenenergy spectrum. This is a conceptually new regime of cavity QED, in which all atoms occupy a single mode of a matter-wave field and couple identically to the light field, sharing a single excitation. This opens possibilities ranging from quantum communication to a wealth of new phenomena that can be expected in the many-body physics of quantum gases with cavity-mediated interactions.Comment: 6 pages, 4 figures; version accepted for publication in Nature; updated Fig. 4; changed atom numbers due to new calibratio

6th Data Science Symposium Abstracts

The Data Science Symposium at Haus der Wissenschaft on 8/9 November 2021 in Bremen was the 6th Symposium in this series since 2017

Controversies in the Treatment Strategies of Intertrochanteric Fractures: A Scoping Review and Discussion of a Literature-Based Algorithm

Intertrochanteric fractures become more and more relevant in an aging population. Despite significant progress in the treatment of these fractures, some technical details, concerning the surgical procedure, are still a matter of strong debate. In this review of the literature, we have included the best evidence available from the last decade in an effort to shed light on some of the most controversial subjects related to intertrochanteric fractures: Treatment in the case of polytrauma or monotrauma? Reconstruction or arthroplasty? Open or closed reduction? Reconstruction with or without additional cables and plates? Cephalomedullary nail or dynamic hip screw (DHS)? Long cephalomedullary nail or short cephalomedullary nail? The results of this scoping review are controversial. By introducing a new therapeutic algorithm, we do not intend to present a new finished guideline but rather arouse a controversial debate about a relevant aspect in geriatric traumatology. These conflicting results are an indication that larger and more well-conducted, high-quality trials are needed in order to gain more secure answers

Das Fach der politischen Bildung auf der Suche nach seinem Proprium. Cover von Politikschulbüchern als bildungshistorische Quellen (1974–2016)

Es kursieren für das Fach der politischen Bildung historisch, international und aktuell die unterschiedlichsten Fachbezeichnungen: Staatsbürgerkunde, Reichskunde, Gegenwartskunde, Sozialkunde, Gemeinschaftskunde, Weltkunde, Gesellschaftslehre, Gesellschaftswissenschaften, Sozi, Sowi, Gewi, Pobi, WiPo, Politikwissenschaft, Soziale Studien, social studies … Diese Liste ist sicher nicht vollständig. Diese Bezeichnungen korrespondieren zudem mit unterschiedlichen disziplinären Fächerzuschnitten. Mit der offenen Namensgebung korrespondiert möglicherweise eine konzeptionelle Unklarheit über die Fachlichkeit. Das Fach gilt als „Nachkömmling unter den großen pädagogischen Aufgaben der Schule“ (Knepper 1988, 75) und wird noch in aktuellen Überblickswerken einer Allgemeinen Fachdidaktik ausgeklammert oder schlicht vergessen (Bayerhuber u. a. 2017; auch Meister u. a. 2020). (DIPF/Orig.