Leibniz University Hannover

Cavity-less Brillouin strong coupling in a solid-state continuous system

Abstract Strong coupling between two systems allows them to exchange coherent information before the systems decohere. This important regime in light–matter interactions has predominantly been reached in optical resonator configurations. Here we demonstrate strong coupling betwee...

An Integrated Workflow for Enriched 3D (e3D) Models to Support Conservation Practices in Cultural Heritage: The ChemiNova Project

The project ChemiNova, funded by the Horizon Europe program, is dedicated to the development of an integrated suite of five software modules to enhance the conservation, analysis, and monitoring of cultural heritage assets. Using non-invasive data acquisition technologies, we pro...

Band-dominated and Fourier-band-dominated operators on locally compact abelian groups

Abstract By relating notions from quantum harmonic analysis and band-dominated operator theory, we prove that, over any locally compact abelian group 𝐺, the operator algebra C 1 \mathcal{C}_{1} from quantum harmonic analysis agrees with the intersection of band-dominated operator...

Drastic Improvement in Carrier Lifetime (>50 ms) and Stability of Poly‐Si‐Passivated n‐Type Cz‐Si Wafers by a Simple Belt‐Line Furnace Annealing Step

We examine the stability of the carrier lifetime of n‐type Cz‐Si wafers with symmetrical n + ‐poly‐Si layers on silicon oxide passivation. Such layers are used in today’s standard industrial TOPCon solar cells and probably in next‐generation IBC cells. Firing in an industrial bel...

FEM∂v: FEM enhanced with boundary-layer virtual elements

We propose F E M 𝜕 v , a boundary-enhanced discretization that retains standard finite elements on a structured background mesh and introduces lowest-order conforming virtual elements only on the polygonal cut cells adjacent to the physical boundary. The geometry is described by...

A Boothby–Wang Construction in Generalized Contact Geometry

ABSTRACT We establish a generalized analogue of the Boothby–Wang theorem in generalized contact geometry, along with related results. We present a general method for constructing examples of generalized contact structures that are not of Poon–Wade type, and even examples that fai...

Observational Validation of Boundary‐Layer Cloud Regimes in Arctic Cold Air Outbreaks

Abstract Arctic cold air outbreaks (CAOs) produce low‐level cloud patterns influencing the surface radiative balance. The stability parameter (boundary‐layer height over Monin‐Obukhov length) is theorized to distinguish shear‐driven roll convection from buoyancy‐driven cellular c...

Digital twin-driven cross-domain damage identification for experimental cable-stayed bridge models under sparse sensing

Reliable damage identification is paramount to structural integrity and operational safety of infrastructure. However, conventional structural health monitoring (SHM) methods often encounter implementation bottlenecks, primarily constrained by data labeling and the inherent discr...

A thorium-229 optical nuclear clock with feedback loop

Abstract The laser-accessible nuclear transition in the thorium-229 isotope has been identified as a candidate for realizing an optical nuclear clock 1 that might outperform current optical clocks based on electron-shell transitions in atoms or ions 2 . It is expected to be more...

Qualification of a Swellable Hydrogel–Silicone Bimorph for Implantable Actuation

To improve the structural adaptability and biological suitability of cochlear implant electrode carriers, this study systematically develops and evaluates novel 3D-printed, swellable hydrogel–silicone composites. A vinylphosphonic acid–acrylamide hydrogel powder (VPA-AAm) was pre...

Comparing the preference of diagnostic information from variations of dynamic testing, criterion- and norm-referenced testing for individualized education planning

The aim of this study was to compare pre-service teachers' preference of information stemming from different diagnostic approaches. Participants ( N = 185) evaluated vignettes containing diagnostic information from norm-referenced testing, criterion-referenced testing, and two ty...

Temporal PV‐Power of Rooftops and Facades in Urban Areas Based on Ray Tracing

ABSTRACT Distributed photovoltaics (PV) can significantly contribute to the reduction of carbon emissions in urban energy systems. Analyzing the integration of distributed PV in such energy systems requires time‐resolved PV‐power for the urban area. This work aims at providing ea...

On large-scale wind-drift ocean currents: An asymptotic approach in spherical coordinates

Starting from the Navier–Stokes equations in rotating spherical coordinates with depth-varying density and eddy viscosity, we derive an asymptotic model describing non-equatorial wind-generated ocean drift currents. Our approach allows for large-scale flows that cannot be capture...

On a trust metric for stochastic multi-objective model-based damage localisation

Model-based structural health monitoring (SHM) is commonly applied to identify the position and extent of potential damage. This is achieved by updating damage parameters to match measured dynamic responses, such as modal properties. Local reductions in stiffness in the updated m...

Multi-facility GNSS antenna calibration

Abstract Accurate antenna calibrations are a cornerstone of high-quality global navigation satellite systems (GNSS) positioning, time and frequency transfer, precise orbits, and troposphere estimates. The international GNSS service (IGS) antenna committee maintains antenna phase...

Supporting AI Readiness Through Digital Workflows in Materials Science

Materials science produces heterogeneous data across experiments, simulations, and industrial processes that often remain bound to local formats, manual procedures, and project‐specific software. Digital workflows address this fragmentation through explicit, repeatable, and machi...

Machine learning algorithms for transplanting accelerometer observations in future satellite gravimetry missions

Abstract Accurate and continuous monitoring of Earth’s gravity field is essential for tracking mass redistribution processes linked to climate variability, hydrological cycles, and geodynamic phenomena. While the GRACE and GRACE Follow-On (GRACE-FO) missions have set the benchmar...

Lifetime reassessment of offshore wind turbines considering different operating conditions using Kriging meta-models

To extend the lifetime of an offshore wind turbine, a lifetime reassessment is required to determine the potential remaining lifetime. This means that the lifetime is recalculated using the combinations of environmental parameters (wind and wave effects) that have actually occurr...

Is trust in science a good thing?

Abstract This paper discusses three different versions of the title question. First, it addresses the question of whether trust, as a special form of shaping interpersonal relationships of reliance, is the right form to aspire to in the case of the relationship of the public to s...

Convolutions of Orlicz spaces and Orlicz Schatten classes, with applications to Toeplitz operators

Abstract Let $$\Phi $$ Φ be a Young function. We study convolution properties for symbol classes $$s_{A,\Phi }$$ s A , Φ , which consist of all a such that the pseudo-differential operator $$\operatorname {Op}_A(a)$$ Op A ( a ) is in the Orlicz Schatten class $$\mathscr {I}_\Phi...