Research works

Energy-level alignment of vacancy-ordered halide double perovskites

Vacancy-ordered double perovskites have emerged as lead-free alternatives, offering remarkable stability and compositional tunability for optoelectronic applications. In this study, we provide first-principles insights into their electronic properties, surface stability, and ener...

The Lee-Yang model and its generalizations through the lens of long-range deformations

Abstract In two dimensions, the non-unitary class of conformal minimal models, M(2,2m+1), has been recently conjectured to arise as renormalization-group fixed points of scalar field theories with complex iφ 2m-1 interaction, m∈N, m≥2. We test a variation of this conjecture throu...

Reflections on time-reversal in the symmetry topological field theory

Symmetry under time-reversal appears in the microscopic description of many physical systems. In a quantum mechanical setting it acts as an anti-unitary operator, so does not fall under general analyses based on unitary symmetries. In classifying zero temperature phases of matter...

Accountability Arbitrage: Ethical Tensions in AI Agent Accountability Infrastructure

AI agents leave operational logs, tool traces, and platform receipts. Newer systems connect these fragments, expose later changes, and support independent verification. As reviewability improves, recordability becomes an allocation factor, not only an engineering property. This a...

How “Micro” Is Microperimetry? Characterizing the Effect of Fundus Tracking on the Psychometric Function

Purpose: The purpose of this study was to quantify whether fundus tracking in microperimetry improves psychometric parameter estimation (as an in vivo demonstration of improved stimulus-delivery precision), and to derive a psychometrically grounded criterion intensity for suprath...

What works, for whom, and under what circumstances for recipients of training in opportunistic behaviour change conversations: A mixed methods realist evaluation protocol

Abstract Background ‘Making Every Contact Count’ (MECC) is a person-centred initiative that enables service providers across settings to support behaviour change through conversations about health and wellbeing. MECC has been widely implemented across the UK and internationally,...

Second Order Closures for the Radiative Transfer Equation: Some Are Unstable

The largest existing simulations of cosmic reionization model radiative transfer with moment methods that require a closure relation. The two most commonly used closure relations are M1 and OTVET; both close the moment hierarchy at the first moment. We explore the properties of a...

Object manipulation scaffolds the development of tool use in children

Our species’ extensive reliance on tool use is a key aspect of what makes us human, yet naturalistic data on the social and environmental drivers of tool use development in children remain scarce. We examined the drivers of tool use in naturalistic observations of 31 children in...

Multi-modal machine learning for prediction of post-anesthesia care unit recovery time

Abstract Background Efficient recovery management in the Post-Anesthesia Care Unit (PACU) is important for patient safety and care coordination, yet estimating recovery duration remains challenging. Traditional regression models and discharge scoring systems have shown limited ac...

Torsional wake stiffness and the dynamic response of tethered tandem cylinders in the subcritical and critical regimes

This study experimentally investigates the stationary and dynamic characteristics of a tandem cylinder configuration in which the downstream cylinder is confined to rotate about a pivot point centered at a fixed upstream cylinder with a specified cylinder-to-cylinder spacing. Res...

Irreducibility of Endomorphisms of Finitely Generated Free Semigroups

We introduce and investigate the irreducibility of endomorphisms of finitely generated free semigroups, i.e., we investigate when an endomorphism $φ: Σ^+ \to Σ^+$, where $Σ$ is any alphabet, can be nontrivially expressed as a composition $φ= ψ_2 \circ ψ_1$ of endomorphisms $ψ_1,...

Bridging worldsheet CFTs and wormholes

A bstract I provide multiple examples of conformal field theories (CFTs) on the world-sheet that describe string propagation in target space wormholes connecting two disjoint asymptotic manifolds. The worldsheet approach goes beyond the framework of supergravity by incorporating...

Maritime ship target detection based on visible and infrared modal image fusion

Abstract The deep learning based maritime ship target detection is a key technology in fields such as ship navigation, water surface security, and military early warning. In view of the inherent limitations of maritime vessel object detection in single modality, a novel YOLO for...

Improving Radar Rainfall Estimate with Kalman Filter Based Bias Adjustment Methods

Abstract This study evaluates three real-time Kalman filter (KF) approaches—Mean Field (MKF), Site-Specific (SKF), and a novel Lagrangian (LKF)—to correct radar rainfall estimation biases. While the SKF addresses spatial heterogeneity by applying independent filters per gauge, th...

Cholecystokinin released somatodendritically from dopamine neurons broadly alters synaptic strength across the ventral tegmental area

Abstract Neuropeptides are found in nearly every brain neuron, and can modulate behaviors by regulating neuronal excitability, synaptic transmission, and plasticity. In contrast to the canonical view of neuropeptide release from nerve terminals, we previously reported the somatod...

Adjuvanted Leishmania infantum extracellular vesicles induce protective immunity in experimental visceral leishmaniasis

Abstract The lack of an effective vaccine remains a critical barrier to controlling visceral leishmaniasis (VL), a lethal parasitic disease with expanding global incidence. Here, we evaluate extracellular vesicles (EVs) released by stationary-phase Leishmania infantum promastigot...

Democratic ideals and reality: Mackinder’s geopolitics in the twenty-first century

Sir Halford Mackinder (1861–1947), the largely forgotten British polymath, argued that democracy should look with suspicion on populist governments. He described this as ‘a wise self-knowledge’ and set out two essential functions states in ‘free countries’ had to perform: ‘to pre...

Detection and Safeguarding of Chinese Toxic Content from Users and LLMs: A Survey

Abstract Toxic content detection and safeguarding have become important topics in natural language processing and affective computing, as they involve the analysis of offensive expressions and harmful attitudes in language. With the widespread adoption of social media, diverse fo...

The influence of El Niño-Southern Oscillation on cool-season precipitation variability in the arid Middle East

Abstract. Interannual variability in precipitation across the Middle East is of high societal and environmental relevance given the region's arid climate and limited water resources. While previous studies have linked the El Niño-Southern Oscillation (ENSO) to interannual precipi...

Performance results of communication based train control (CBTC) on the Copenhagen suburban railways

The Danish national railway infrastructure operator, Banedanmark, replaced the signals on a 171 km suburban railway network with CBTC (Communications Based Train Control) over a six-year period from 2016 to 2022. A detailed statistical analysis of the public traffic disruption da...