561975 research outputs found
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Die Zukunft ist nicht nur etwas, das uns zustößt
No full textMehr Utopie wagen: Wie können wir das Morgen wieder optimistischer denken? Ein Gespräch mit dem Kulturmanager Stefan Brandt, dem Soziologen Steffen Mau und der Schriftstellerin Juli Ze
Daten-Governance für urbane Innovation - Analyse der Datennutzungsregeln (DNG, DGA, Data Act) unter Berücksichtigung des Kartell-, Vergabe- und Beihilfenrechts am Beispiel Hamburg
No full textDas Buch analysiert den Rechtsrahmen für das Teilen öffentlicher Daten in Deutschland am Beispiel des Stadtkonzerns Hamburg. Es beleuchtet DNG, DGA und Data Act sowie deren Auswirkungen auf die Daten-Governance öffentlicher Stellen und öffentlicher Unternehmen. Die rechtlichen Anforderungen (inkl. kartell-, vergabe- und beihilfenrechtlicher Aspekte) und Gestaltungsspielräume werden aufgezeigt sowie Empfehlungen für die Praxis ausgesprochen.· Fundierte Analyse unionsrechtlicher und nationaler Vorgaben zum Datenteilen (DGA, DA, DNG)· Praxisnahe Szenarien und Empfehlungen für öffentliche Stellen und öffentliche Unternehmen· Bezüge zum Kartellrecht, Vergaberecht und Beihilfenrech
Electrical Step-Edge Contact to a Topological Superconductor Candidate 2M-WS<sub>2</sub>
No full textA topological superconductor (TSC), characterized by a topologically nontrivial bulk state and protected gapless boundary states, is a promising platform for hosting Majorana bound states. However, many TSCs are environmentally sensitive, especially when thinned to 2D atomic layers. This instability poses a major challenge for integrating TSCs into electronic devices. Addressing it requires full encapsulation and high-quality electrical contact to the TSC layer, which have not yet been achieved. Here, a novel contact geometry is demonstrated for an encapsulated topological superconductor candidate, 2M-WS2, where metal electrodes contact the exposed step-like edges with a width of only a few nanometers. This structure yields exceptionally low contact resistance (RC), down to ∼ 670 Ω·µm for a single unit and ∼ 65 Ω·µm for a six-unit 2M-WS2 device. Below the superconducting critical temperature (TC), the TSC–metal interface becomes highly transparent, as evidenced by the Andreev reflection. Furthermore, the step-edge contact prevents contamination during fabrication, enabling unprecedentedly high-quality devices. In encapsulated 2M-WS2, twofold rotational symmetry of the critical current (IC) and multiple anomalous peaks are observed in the differential resistance (dV/dI). The anisotropic IC originates from Fermi velocity variations along in-plane lattice directions, while the anomalous peaks suggest multigap superconductivity in 2M-WS2. These results reveal the intrinsic properties of 2M-WS2 and offer a new path toward high-performance TSC-based electronics
Microstructural evolution in high-temperature direct aging on PBF-LB 15-5PH stainless steel
No full textDual-function nanographene-peptide conjugates enable super-resolution mitochondria imaging and targeted DNA delivery in plants
No full textIdentification and Characterization of anIn Silico Designed Membrane‐Active Peptide with Antiviral Properties
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Multifunctional Self-Powered PVDF/TiO<sub>2</sub> Nanowire Platform for Energy Harvesting and Precision Vortex Flow Sensing
No full textPulsar timing array analysis in a Legendre polynomial basis
No full textWe use Legendre polynomials, previously employed in this context by Lee et al. [1], van Haasteren and Levin [2], and Pitrou and Cusin [3], to model signals in pulsar timing arrays (PTA). These replace the (Fourier mode) basis of trigonometric functions normally used for data analysis. The Legendre basis makes it simpler to incorporate pulsar modeling effects, which remove constant-, linear-, and quadratic-in-time terms from pulsar timing residuals. In the Legendre basis, this zeroes the amplitudes of the the first three Legendre polynomials. We use this basis to construct an optimal quadratic cross-correlation estimator of the Hellings and Downs (HD) correlation and compute its variance in the way described by Allen and Romano [4]. Remarkably, if the gravitational-wave background (GWB) and pulsar noise power spectra are (sums of) power laws in frequency, then in this basis one obtains analytic closed forms for many quantities of interest
Color symmetry breaking in a nonlinear optical microcavity
No full textSpontaneous symmetry breaking leads to diverse phenomena across the natural sciences, from the Higgs mechanism in particle physics to superconductors and collective animal behavior. In photonic systems, the symmetry of light states can be broken when two optical fields interact through the Kerr nonlinearity, as shown in early demonstrations with counterpropagating and cross-polarized modes. Here, we report the first observation of color symmetry breaking in an integrated silicon nitride microring, where spontaneous power imbalance arises between optical mode at different wavelengths, mediated by the Kerr effect. The threshold power for this effect is as low as 19 mW. By examining the system's homogeneous states, we further demonstrate a Kerr-based nonlinear activation-function generator that produces sigmoid-, quadratic-, and leaky-ReLU-like responses. These findings reveal previously unexplored nonlinear dynamics in dual-pumped Kerr resonators and establish new pathways towards compact, all-optical neuromorphic circuits