Helmut Schmidt University

Recommended Second Virial Coefficients for Nitrogen and Oxygen

We provide recommended values for the second virial coefficient, B(T), and its uncertainty, for molecular nitrogen and oxygen. The temperature range covered is 20–3000 K for nitrogen and 20–2000 K for oxygen. The recommendations are based on tuning previously published state-of-t...

Introduction: Current functional lines of thinking in sociological theory and research

This thematic issue aims to reconsider the potentials and shortcomings of functional lines of thinking in current sociology. This is important because, despite strong criticism, functional reasoning is still present in social theory and research. However, references often remain...

Credit the advice, own the choice: governing expertise in German policymaking

Abstract Democratic governments depend on expertise. Yet expert authority becomes fragile when advisory roles remain ill-defined, evidentiary and decision pathways cannot be reconstructed, disagreement is submerged beneath claims of consensus, or democratically accountable decisi...

Intracavity THz Generation Using a Thin Lithium Niobate Plate in a Compact Kerr-Lens Mode-Locked Yb:CALGO Bulk Oscillator

Abstract We demonstrate intracavity terahertz (THz) generation via optical rectification in a 50-µm-thick lithium niobate crystal placed inside a compact diode-pumped Kerr-lens mode-locked (KLM) Yb:CALGO bulk oscillator. The oscillator operates at a repetition rate of 85 MHz and...

From detection to action: Using LLM agents for Fault-Tolerant Control

We propose an agentic Large Language Model (LLM) framework for active Fault-Tolerant Control (FTC) that transforms fault detection outputs into constraint-aware recovery actions grounded in plant-specific knowledge. The approach couples (i) a multi-agent workflow that decomposes...

Hydroalcoholic extraction and carbon-coated zero-valent iron nanoparticles: Comparative valorisation routes for olive mill wastewater

This study evaluated two valorisation routes for olive mill wastewater (OMW): hydroalcoholic extraction of a crude phenolic-rich fraction and hydrothermal carbonisation (HTC) to produce carbon-coated zero-valent iron nanoparticles (FeC 0 NPs). Their cradle-to-gate profiles were c...

On the Validity of Regression Models

This work elaborates the connection between prediction and description in regression analysis. Many empirical studies aim at description, which requires a valid regression model. I show that regression models with a strong prediction power can be highly invalid and thus be inappr...

On the Validity of Regression Models

This work elaborates the connection between prediction and description in regression analysis. Many empirical studies aim at description, which requires a valid regression model. I show that regression models with a strong prediction power can be highly invalid and thus be inappr...

What Is Science?

This work addresses the demarcation problem by proposing an axiomatic approach to distinguishing science from pseudoscience. It builds on three simple and intuitive axioms that characterize a consistent demarcation criterion. Neither Popper's falsification criterion nor the verif...

What Is Science?

This work addresses the demarcation problem by proposing an axiomatic approach to distinguishing science from pseudoscience. It builds on three simple and intuitive axioms that characterize a consistent demarcation criterion. Neither Popper's falsification criterion nor the verif...

Stochastic Galerkin and Monte Carlo Methods for Parabolic Problems: Numerical Performance of Variational Matrix‐Free Approximations

ABSTRACT Stochastic Galerkin methods offer unexplored potential for the numerical simulation of parabolic problems with random variables, in particular if they are combined with variational discretizations of the space and time variables. Due to the high dimensionality, the solut...

What Is Science? And What We Have Done to It with Hypothesis Testing

This work addresses the demarcation problem by proposing an axiomatic approach to distinguishing science from pseudoscience. It builds on three simple and intuitive axioms that characterize a consistent demarcation criterion. Neither Popper's falsification criterion nor the verif...

Boys Score Higher Everywhere? Gender Differences in Parent-Reported ADHD Symptoms Across Age Groups and Four Countries

Abstract Research suggests gender differences in parent-reported ADHD symptoms, but it remains unclear whether these differences vary across age group and countries. This study examined cross-national gender differences from early, middle and late childhood. Using a meta-analytic...

SOEP-LEE2: Data Updates and New Research Opportunities

Abstract The Socio-Economic Panel Linked Employer–Employee Survey, Version 2 (SOEP-LEE2), provides linked information on employees, establishments, and self-employed individuals in Germany. An earlier Data Observer article (Matiaske, Wenzel, Torben Dall Schmidt, Christoph Halbmei...

Multi-scale experimental and numerical analysis of thermal conductivity improvements in metal hydride composite systems

The inherently low thermal conductivity of metal hydrides significantly hinders heat transfer and, consequently, the kinetics of hydrogen absorption and desorption processes. To address this limitation, strategies such as adding high-thermal-conductivity materials have been explo...