Fachbericht Lastverschiebungspotenziale von Haushaltsgeräten durch Smart Metering

DOI: http://dx.doi.org/10.13154/RUB.74.79 Der Fachbericht umfasst eine Untersuchung der Potenziale unterschiedlicher Haushaltsgeräte durch den Einsatz von Smart Metering. Dabei werden auf Grundlage einer Literaturrecherche Hochrechnungen möglicher Lastverschiebungspotenziale sowohl für Regel- als auch Strompreissignale durchgeführt und miteinander verglichen. Wettbewerb "Energieeffiziente Stadt" Websitehttps://www.wettbewerb-energieeffiziente-stadt.de/ Ruhr-Universität Bochum, Lehrstuhl Energiesysteme und Energiewirtschafthttp://www.lee.ruhr-uni-bochum.de

Fachbericht Ökobilanzen von Wärmeerzeugern mit Leistungen von 50 kW bis 500 kW

DOI: http://dx.doi.org/10.13154/RUB.72.78 Der Fachbericht umfasst eine Recherche und Gegenüberstellung des Kumulierten Energieaufwands (KEA) und der Treibhausgas-Emissionen der Herstellung, Nutzung und Entsorgung von Heizkesseln in einem Leistungsbereich von 50 kW bis 500 kW. Grundlage für die Gegenüberstellung der Daten bildet ein Vergleich von Annahmen und Systemgrenzen unterschiedlicher verwendeter Ökobilanz-Datenbanken. Wettbewerb "Energieeffiziente Stadt" Website: https://www.wettbewerb-energieeffiziente-stadt.de/ Ruhr-Universität Bochum, Lehrstuhl Energiesysteme und Energiewirtschafthttp://www.lee.ruhr-uni-bochum.de

FMRI resting slow fluctuations correlate with the activity of fast cortico-cortical physiological connections

Recording of slow spontaneous fluctuations at rest using functional magnetic resonance imaging (fMRI) allows distinct long-range cortical networks to be identified. The neuronal basis of connectivity as assessed by resting-state fMRI still needs to be fully clarified, considering that these signals are an indirect measure of neuronal activity, reflecting slow local variations in de-oxyhaemoglobin concentration. Here, we combined fMRI with multifocal transcranial magnetic stimulation (TMS), a technique that allows the investigation of the causal neurophysiological interactions occurring in specific cortico-cortical connections. We investigated whether the physiological properties of parieto-frontal circuits mapped with short-latency multifocal TMS at rest may have some relationship with the resting-state fMRI measures of specific resting-state functional networks (RSNs). Results showed that the activity of fast cortico-cortical physiological interactions occurring in the millisecond range correlated selectively with the coupling of fMRI slow oscillations within the same cortical areas that form part of the dorsal attention network, i.e., the attention system believed to be involved in reorientation of attention. We conclude that resting-state fMRI ongoing slow fluctuations likely reflect the interaction of underlying physiological cortico-cortical connections

Fachbericht Ökobilanz der Mobilitätskonzepte der Stadt Essen

DOI: http://dx.doi.org/10.13154/RUB.71.77 Um die deutschen Klimaschutzziele zu erreichen, sind Einsparungen in allen energierelevanten Verbrauchssektoren nötig. Dazu werden in diesem Fachbericht kommunale Mobilitätskonzepte untersucht. Dabei liegt der Fokus auf der energetischen sowie ökobilanziellen Betrachtung und Bewertung ausgewählter Mobilitätsmaßnahmen des Wettbewerb „Energieeffiziente Stadt“. Betrachtet wird die Nutzungsphase dieser Maßnahmen, wodurch die Auswirkungen sich verändernder Mobilitätskonzepte quantifiziert werden können. Wettbewerb "Energieeffiziente Stadt" Website: https://www.wettbewerb-energieeffiziente-stadt.de/ Ruhr-Universität Bochum, Lehrstuhl Energiesysteme und Energiewirtschaft:http://www.lee.ruhr-uni-bochum.de

Structural Parameters of Seven SMC Intermediate-Age and Old Star Clusters

We present structural parameters for the seven intermediate-age and old star clusters NGC121, Lindsay 1, Kron 3, NGC339, NGC416, Lindsay 38, and NGC419 in the Small Magellanic Cloud. We fit King profiles and Elson, Fall, and Freeman profiles to both surface-brightness and star count data taken with the Advanced Camera for Surveys aboard the Hubble Space Telescope. Clusters older than 1 Gyr show a spread in cluster core radii that increases with age, while the youngest clusters have relatively compact cores. No evidence for post core collapse clusters was found. We find no correlation between core radius and distance from the SMC center, although consistent with other studies of dwarf galaxies, some relatively old and massive clusters have low densities. The oldest SMC star cluster, the only globular NGC121, is the most elliptical object of the studied clusters. No correlation is seen between ellipticity and distance from the SMC center. The structures of these massive intermediate-age (1-8 Gyr) SMC star clusters thus appear to primarily result from internal evolutionary processes.Comment: 16 pages, 13 figure

Strong dipolar effects in a quantum ferrofluid

We report on the realization of a Chromium Bose-Einstein condensate (BEC) with strong dipolar interaction. By using a Feshbach resonance, we reduce the usual isotropic contact interaction, such that the anisotropic magnetic dipole-dipole interaction between 52Cr atoms becomes comparable in strength. This induces a change of the aspect ratio of the cloud, and, for strong dipolar interaction, the inversion of ellipticity during expansion - the usual "smoking gun" evidence for BEC - can even be suppressed. These effects are accounted for by taking into account the dipolar interaction in the superfluid hydrodynamic equations governing the dynamics of the gas, in the same way as classical ferrofluids can be described by including dipolar terms in the classical hydrodynamic equations. Our results are a first step in the exploration of the unique properties of quantum ferrofluids.Comment: Final, published versio

Age Determination of Six Intermediate-age SMC Star Clusters with HST/ACS

We present a photometric analysis of the star clusters Lindsay 1, Kron 3, NGC339, NGC416, Lindsay 38, and NGC419 in the Small Magellanic Cloud (SMC), observed with the Hubble Space Telescope Advanced Camera for Surveys (ACS) in the F555W and F814W filters. Our color magnitude diagrams (CMDs) extend ~3.5 mag deeper than the main-sequence turnoff points, deeper than any previous data. Cluster ages were derived using three different isochrone models: Padova, Teramo, and Dartmouth, which are all available in the ACS photometric system. Fitting observed ridgelines for each cluster, we provide a homogeneous and unique set of low-metallicity, single-age fiducial isochrones. The cluster CMDs are best approximated by the Dartmouth isochrones for all clusters, except for NGC419 where the Padova isochrones provided the best fit. The CMD of NGC419 shows several main-sequence turn-offs, which belong to the cluster and to the SMC field. We thus derive an age range of 1.2-1.6 Gyr for NGC419. Interestingly, our intermediate-age star clusters have a metallicity spread of ~0.6 dex, which demonstrates that the SMC does not have a smooth, monotonic age-metallicity relation. We find an indication for centrally concentrated blue straggler star candidates in NGC416, while for the other clusters these are not present. Using the red clump magnitudes, we find that the closest cluster, NGC419 (~50kpc), and the farthest cluster, Lindsay 38 (~67kpc), have a relative distance of ~17kpc, which confirms the large depth of the SMC.Comment: 25 pages, 45 Figure

QCD sum rule analysis for light vector and axial-vector mesons in vacuum and nuclear matter

Extending previous work we study the constraints of QCD sum rules on mass and width of light vector and axial-vector mesons in vacuum and in a medium with finite nuclear density. For the latter case especially the effect of nuclear pions leading to vector-axial-vector mixing is included in the analysis.Comment: RevTeX, 32 pages, 10 eps figure

On the perturbative chiral ring for marginally deformed N=4 SYM theories

For \cal{N}=1 SU(N) SYM theories obtained as marginal deformations of the \cal{N}=4 parent theory we study perturbatively some sectors of the chiral ring in the weak coupling regime and for finite N. By exploiting the relation between the definition of chiral ring and the effective superpotential we develop a procedure which allows us to easily determine protected chiral operators up to n loops once the superpotential has been computed up to (n-1) order. In particular, for the Lunin-Maldacena beta-deformed theory we determine the quantum structure of a large class of operators up to three loops. We extend our procedure to more general Leigh-Strassler deformations whose chiral ring is not fully understood yet and determine the weight-two and weight-three sectors up to two loops. We use our results to infer general properties of the chiral ring.Comment: LaTex, 40 pages, 4 figures, uses JHEP3; v2: minor correction