Leiden University

Risk Theory in a Finite Customer-Pool Setting

This paper investigates an insurance model with a finite number of major clients and a large number of small clients, where the dynamics of the latter group are modeled by a spectrally positive Levy process. We begin by analyzing this general model, in which the inter-arrival tim...

Light‐Enhanced Chloride Transport by Thiourea‐Appended Molecular Motor

ABSTRACT The regulation of solute transport across lipid bilayer membranes is central to many biological processes and is typically mediated by protein transporters that dynamically respond to stimuli. The development of artificial systems that emulate such responsive behavior re...

Population cycles and hydroclimatic forcing in a wetland oak population: A 1.800-year tree-ring record from the Rhine Delta

Subfossil bog oaks provide high-resolution archives of hydroecological variability in fluvial wetlands. In this study we analyse an exceptionally large dendrochronological dataset of 500 oak trunks recovered from peat deposits in the Angstel–Vecht region of the western Netherland...

Little Red Dots host Black Hole Stars: A unified family of gas-reddened AGN revealed by JWST/NIRSpec spectroscopy

Abstract We construct and characterise a sample of 146 little red dots (LRDs) across 2.0 < z < 9.3, selecting all sources with v-shaped UV-optical continua from JWST NIRSpec/PRISM spectra and compact morphologies in NIRCam/F444W imaging. We show that LRD continuum spectra are wel...

A modern toolbox to elucidate the role of the human microbiome in modulating mycobacterial gut infections

Abstract Inflammatory bowel diseases (IBDs) are a major public and veterinary health concern, but the causes are poorly understood. In this review, we discuss the potential of mycobacteria as causative factors for such diseases. We focus on similarities between the most common hu...

Clinicians’ practices and attitudes toward depression assessment: a cross-sectional survey study

<title>Abstract</title> Accurate psychological evaluation is crucial for early detection, intervention and evaluation of mental health disorders. The validity and reliability of psychological evaluation methods have been systematically researched for many decades. However, assess...

Exploring Victim-Offender Interactions During a Ransomware Attack Using LockBit Chat Negotiations

This study explores interactions between ransomware victims and offenders through a qualitative analysis of chat negotiations of the LockBit ransomware group (n=147), providing insight into data exfiltration, extortion, communication and negotiation, payment, and post-payment out...

CO 2 ‐to‐CO Electrochemical Conversion With an Fe(I) Porphyrin Complex in Water

ABSTRACT Iron porphyrin complexes constitute a well‐established and versatile class of molecular electrocatalysts for the reduction of CO 2 to CO. In both organic and aqueous media, the reaction mechanism is typically proposed to involve the interaction of CO 2 with a formally de...

The Search for Life Elsewhere: Avoiding Hype and Fostering Public Understanding

The search for life beyond Earth presents unique challenges for science communication due to its interdisciplinary nature, the potential for groundbreaking discoveries, and the inherent uncertainties involved. The Lorentz Center workshop Breaking News: We Found Extraterrestrial L...

AI, citizen science data and expert opinions: towards an improved fossil identification process

Accurate identification of fossils is instrumental to palaeontological research but requires expert knowledge, is time consuming and subject to human biases. Through citizen science platforms and apps, artificial intelligence (AI)-assisted identifications can mitigate those chall...

STARSFLUX: an all-sky catalogue of absolute spectro-photometric calibrators from 0.3 to 30 μ m

Abstract Obtaining accurate fluxes of faint sources from the ground in near- and mid-infrared wavelengths is challenging because of the rapidly changing atmospheric absorption. A common limitation is the lack of a nearby spectro-photometric calibrator. We present the STellar Abso...