Beijing Normal University

Research on a Differential Game Considering Endurance and Marketing Effort for eVTOL Under a Subsidy Policy

Electric vertical takeoff and landing (eVTOL) represents a novel mode of transportation emerging within the low-altitude economy framework, exhibiting extensive development prospects. As a widely adopted incentive policy, government subsidy constitutes a crucial method for suppor...

Laplace surface of eccentric orbits around Kerr black hole and black-hole effects on Lidov-Kozai cycles

Abstract We study the Laplace surface of eccentric orbits around a Kerr black hole with a companion star. The two relativistic effects (periapsis apsidal precession and Lense-Thirring precession) balance companion’s tidal effect. By solving the secular equations, we find that the...

A Re-Understanding of the Tragic Roots of Antigone from the Perspective of Chinese Confucian Legal Thought

Abstract Critics often fall into Hegel’s dualistic thinking pattern when interpreting the tragic roots of Antigone , in which the conflict between “human law” and “divine law” has long been considered the core of the play. This article seeks to explore the internal homogeneity of...

Extraversion and physical activity in older adults: a structural equation model with serial mediators of loneliness, anxiety, and life satisfaction

Extraversion is one of the most robust personality correlates of physical activity. However, the mechanisms linking extraversion to physical activity in later life remain insufficiently understood. Loneliness, anxiety, and life satisfaction may represent important pathways linkin...

Quantum Phase Transitions in Coherent Ising Machines: XY Model for Demonstration

ABSTRACT In this work, we study the detection of quantum phase transitions (QPTs) in coherent Ising machines (CIMs) through a spectral mapping between the one‐dimensional XY spin model and a network of degenerate optical parametric oscillators (DOPOs). This exact correspondence r...

Compound patterns and environmental drivers of typhoon disaster chains in southeast coastal China: a multiscale framework

Typhoons frequently trigger interacting hazards, including river flooding, urban waterlogging, landslides, and storm surge, but disaster records compiled at the event or administrative-unit level limit systematic analysis of their spatial co-occurrence and environmental different...

Global Existence and Nonlinear Stability of Finite-Energy Solutions of the Compressible Euler–Riesz Equations with Large Initial Data of Spherical Symmetry

Abstract The compressible Euler–Riesz equations are fundamental with wide applications in astrophysics, plasma physics, and mathematical biology. In this paper, we are concerned with the global existence and nonlinear stability of finite-energy solutions of the multidimensional E...

Spatiotemporal Dynamics and Multi-Scale Diagnosis of Urban Resilience to Typhoon Disaster Chains in Fujian, China

Abstract Coastal cities in southeastern China face increasing threats from typhoon-induced compound disasters (for example, torrential rainfall, urban waterlogging, and storm surges) that can cascade into interconnected disaster chains under climate change and rapid urbanization....

Development and validation of the mathematics anxiety questionnaire for primary school students

Mathematics anxiety is a significant emotional factor that can negatively influence students’ motivation, confidence, and achievement in mathematics learning. This study aimed to develop and validate the Student’s Mathematics Anxiety Questionnaire (SMAQ) for primary school studen...

A Deep SETI Search for Technosignatures in the TRAPPIST-1 System with FAST

Abstract The Five-hundred-meter Aperture Spherical Telescope (FAST) is the world’s largest single-dish radio telescope, and the search for extraterrestrial intelligence (SETI) is one of its five key science objectives. We conducted a targeted search for unresolved narrowband radi...

Recent globally synchronous seasonal warm events unprecedented since 850 CE

Spatially synchronous extreme warm events can amplify environmental and societal impacts by affecting multiple regions simultaneously. However, previous studies have largely focused on June–August (JJA) events during the instrumental period, limiting understanding of their season...

A Physics‐Guided Feature Selection Machine Learning Approach for Cloud Probability Retrieval and Detection From TEMPO Imagery

Abstract Accurate cloud detection is critical for reliable retrievals of aerosols and trace gases from remote‐sensing measurements. TEMPO provides unprecedented hourly observations over North America, but radiometric calibration biases, thousands of spectral channels, and limited...

Cascading risks in the global nickel supply chain and their implications for battery-based electrification

Global electrification is rapidly increasing nickel demand because of its role in nickel-rich battery chemistries. Yet the systemic vulnerabilities of the global nickel supply chain and their implications for battery-related electrification remain insufficiently understood. Here,...

Self-Referential Introspection in Large Language Models: The Critical Threshold for Recursive Self-Improvement

The pursuit of self-evolving AI raises a critical question: when is autonomous self-improvement sustainable rather than degenerative? Drawing an analogy to von Neumann’s complexity threshold for self-reproducing automata, we argue that sustainable recursive self-improvement in la...

Family needs of preschool children with hearing loss in a multi-provincial service-connected sample in China: a cross-sectional survey

OBJECTIVE: To develop and preliminarily evaluate a China-contextualized Family Needs Scale and describe priority needs in a multi-provincial service-connected sample of pre-school children with hearing loss. DESIGN: Cross-sectional survey. STUDY SAMPLE: Primary caregivers (N = 26...

Recent Increaseof Greenhouse Gas Emissions from Cryosphere-InfluencedReservoirs under Climate Change

Abstract Global warming leads to cryosphere degradation, transferring large amounts of terrestrial carbon and nitrogen to reservoirs, which may accelerate the release of greenhouse gases (GHGs) to the atmosphere. However, the spatial dynamics and decadal trends of GHG emissions f...

Gut Microbiota Is Linked to Female Olfactory Preference in Giant Pandas

Mate choice can vary with internal condition, but whether gut microbial variation is associated with female mate-choice-related olfactory preferences remains poorly understood. In this study, we tested whether dietary dried yeast supplementation was associated with changes in gut...

FacilitatingJ-Aggregate Formation by LoweringActivation Energy to Achieve Ultrahigh Brightness for NIR-II FluorescenceImaging and Photoacoustic Imaging

Abstract Organic fluorophores operating in the second near-infrared window (NIR-II, 900–1700 nm) are plagued by low quantum yields (QYs) and diminished brightness in aqueous media. To address this challenge, we proposed a strategy of regulating the activation energy for aggregate...

Geometric standardized mean difference and its application to meta‐analysis

The standardized mean difference (SMD) is a widely used measure of effect size, particularly common in psychology, clinical trials and meta-analysis involving continuous outcomes. Traditionally, under the equal variance assumption, the SMD is defined as the mean difference divide...

Teachers’ attitudes towards artificial intelligence: a cross-national latent profile analysis

Artificial intelligence (AI) is increasingly positioned as transformative in education, yet teachers’ attitudes remain unevenly understood across national contexts. Guided by a conceptual framework informed by the Technology Acceptance Model (TAM), this study used a person-centre...