Paderborn University

Integrating Hyperuniform Disordered Light Trapping Layers in Ultrathin c-Si Solar Cells

Abstract Ultrathin crystalline silicon solar cells require advanced light trapping to compensate for weak near-infrared (NIR) absorption. Here, we integrate hyperuniform disordered light-engineered (HUDLE) nanopatterns with high-quality surface passivation in 4.8 μm c Si cells an...

Hotspot Formation Driven by Temperature-Dependent Coefficients in One-Dimensional Thermoviscoelasticity

Abstract. This manuscript is concerned with a two-component evolution system generalizing the classical model for one-dimensional thermoviscoelastic dynamics in Kelvin–Voigt materials in the presence of temperature-dependent viscosities and elastic stiffnesses. Under suitable ass...

The Infinite Block Spin Ising Model

Abstract We study a block mean-field Ising model with N spins split into $$s_N$$ s N blocks, with Curie–Weiss interaction within blocks and nearest-neighbor coupling between blocks. While previous models deal with the block magnetization for a fixed number of blocks, we study the...

Review on telecom quantum dots: Challenges and perspectives

Single and entangled photons are an essential resource for quantum communication, enabling the transmission of quantum information. For this technology to work on long-distance networks, quantum light sources are needed that produce photonic quantum states, such as single photons...

Hierarchical Fe–Co LDH/Fe-CoSOH Nanoneedle-Nanosheet Heterostructure for Efficient Oxygen Evolution

Abstract Developing efficient and stable oxygen evolution reaction catalysts is crucial for practical water splitting. Herein, a mild room-temperature sulfidation strategy is employed to construct a hierarchical heterostructure composed of Fe-Co LDH nanoneedles and ultrathin Fe-C...

Patterson–Sullivan and Wigner distributions of convex-cocompact hyperbolic surfaces

We prove that the Patterson–Sullivan and Wigner distributions on the unit sphere bundle of a convex-cocompact hyperbolic surface are asymptotically identical. This generalizes results in the compact case by Anantharaman–Zelditch and Hansen–Hilgert–Schröder.

Energy transition and economic growth in low-income countries: the role of climate finance

Abstract Although prices for renewable energy technologies have recently declined, many low-income countries still face barriers to deployment. The energy supply for their growing economies largely originates from the burning of fossil fuels. To avoid accelerating global greenhou...

Trade Exposure and the Decline in Collective Bargaining: Evidence From Germany

ABSTRACT We analyze how rising trade exposure from China and Eastern Europe affected collective bargaining coverage in German plants from 1996 to 2008. Using cross‐industry variation in trade exposure and instrumenting with trade flows from other high‐income countries, we find th...

Resource, actor, beneficiary, or agent? A service-dominant perspective on generative artificial intelligence

Abstract Generative artificial intelligence (GenAI) challenges core concepts in service science by blurring boundaries among resources, actors, and beneficiaries. Using service-dominant logic (SDL) as a theoretical lens, we review the distinctive properties of these concepts, int...

The TOXIC schema: How Nick Land's Dark Enlightenment works

Nick Land is a British philosopher who has been leading the Dark Enlightenment movement. This paper examines the philosophical foundations of Land's right-wing trajectory and asks how the digital is integrated into his political economy and anti-humanist worldview. It situates La...

OPTICAT: A Deep Reinforcement Learning Framework for Instance-Specific Algorithm Configuration

Optimization algorithms contain parameters that greatly influence their behavior. Finding the right settings for parameters through automated algorithm configuration has become a critical component of designing competitive algorithms. While traditional offline configurators tackl...

Reservoir Neuromorphic Computing Based on Spin-Orbit Coupling in an Organic Crystal Resonator

Abstract Neuromorphic computing is at the basis of the recent progress in artificial intelligence, but this progress is accompanied by an increasing demand for computational resources and power supply. Reservoir neuromorphic computing uses a nonlinear physical system to replace a...

Antithrombotic therapy after percutaneous coronary intervention in patients with atrial fibrillation: an individual patient data network meta-analysis

BACKGROUND AND AIMS: Randomized trials demonstrated that in patients with atrial fibrillation (AF) undergoing percutaneous coronary intervention (PCI) direct oral anticoagulants (DOAC) and a P2Y12 inhibitor reduce bleeding compared with vitamin K antagonist (VKA) plus dual antipl...

Non-Hermitian trapping of Dirac exciton-polariton condensates in a perovskite metasurface

Massless Dirac particles avoid trapping because of their exceptional tunneling properties manifested in the so-called Klein paradox. This conclusion stems from the conservative treatment, but so far, it has not been extended to a non-Hermitian framework. Recently, driven-dissipat...

Transcritical–Transcritical Cascade CO2 Heat Pump with Expansion Work Recovery: A Thermodynamic Analysis

High-temperature heat pumps are a promising pathway for electrifying industrial process heat, but their application to large-temperature-glide duties remains technically challenging. Milk powder spray drying is one such application, requiring air heating to approximately 200 °C w...

Building inclusive learning communities: the collaborative role of parents and school leaders in supporting students with additional needs

Inclusive education is widely endorsed as a policy priority; however, less is known about how school leaders practically enable collaboration with parents to support inclusive schooling. This qualitative study examines how secondary school leaders enact and sustain collaboration...

Inscription of power dynamics in platformized classrooms. Exploring coded spaces of platform architectures through Participatory Action Research

Platforms contribute to the ‘world-making’ of education; they play a co-constitutive role by envisioning and inscribing the functionalities anticipated in education. As programmable digital architectures, they both shape and are shaped by teachers’ and students’ practices. Buildi...

Influence of the R-Ratio and the Temperature on the Coefficients of a Novel Exponential Approach for the Formulaic Description of Fatigue Crack Growth Rate Curves

Investigating crack growth in sheet metal originating from clinched joints is a major part of predicting the service life of mechanically joined structures. Clinching allows different materials to be joined together. A key task in this context is to perform crack growth simulatio...