Beijing Institute of Technology

Design and fabrication of a freeform optical engine for full-color geometric waveguide augmented reality glasses

One-dimensional (1D) geometric waveguide displays are well suited for full-color augmented reality (AR) glasses because they provide higher optical efficiency and require lower source radiance than two-dimensional pupil-expanding architectures. However, the highly asymmetric shap...

Temperature field evolution and optimization simulation of cryo-adsorptive hydrogen vessel filling over a wide pressure range

Cryo-adsorptive hydrogen storage is a promising densified hydrogen storage approach, but thermal effects such as adsorption heat during filling can cause non-uniform temperature fields and reduce storage performance. In this work, a cryo-adsorptive hydrogen storage vessel packed...

Design and Compression Failure Mechanisms of Stiffener–Skin Integrated CFRP Stiffened Panel

ABSTRACT Traditional cobonded CFRP stiffened panels are susceptible to premature stiffener–skin debonding under axial compression. This behavior is mainly caused by discontinuous load transfer across adhesive interfaces, leading to interface‐dominated failure. To investigate the...

Dynamic energy-release model for reactive composite jets impacting spaced plate-enhanced sealed chamber

Reactive composite jets combine the penetration capability of metallic jets with the secondary energy release of reactive materials, but a unified model that links jet formation, penetration, reaction evolution, and aftereffect overpressure remain incomplete. This study proposes...

Vortex dynamics of a boundary layer disturbed by cylinder wakes: effects of the gap ratio and the relative boundary layer thickness

The vortical structures in a flat-plate boundary layer disturbed by circular cylinder wakes are investigated using particle image velocimetry and hydrogen bubble visualization techniques. The cylinder diameter ( D ) and the gap between the cylinder and flat plate ( G ) are system...

Evaluating Effectiveness and Economic Benefits of Meteorological Health Warning Systems: A Case Study of Stroke Warnings in Tianjin, China

Abstract Meteorological health warning systems have received global attention for their role in climate health adaptation. However, existing evaluation studies rarely considered nonlinear and time-lagged relationships between meteorological factors and health outcomes. Calculatio...

A battery life prediction method based on graph neural network assisted by deep reinforcement learning

With the wide utilization of new energy batteries, the accurate prediction of battery life has become an urgent technical issue that needs to be addressed. Studies have developed battery life prediction models based on correlation analysis for feature extraction. This study intro...

Differential Coupling of Nanoparticle Translational and Rotational Diffusion to Polymer Relaxation Modes in Unentangled Polymer Melts

Abstract The diffusion of spherical nanoparticles (NPs) in unentangled polymer melts is investigated using coarse-grained molecular dynamics simulations. We show that for both translational and rotational diffusion, when the NP diameter d is smaller than a characteristic length l...

Fractional-Quantum Ferroelectrics: A Route to High-Mobility Ferroelectric Semiconductors

Abstract Ferroelectric semiconductors are promising for multifunctional electronics, yet their typically low carrier mobilities remain a major limitation. Using first-principles phonon-limited transport calculations for monolayer In2Se3, we show that this limitation depends criti...

LigPPFNet: A Lightweight Multimodal Fusion Method for Palmprint and Palm Vein Recognition

ABSTRACT Due to their high stability, accuracy, and security, palmprint and palm vein recognition offer significant advantages in biometric applications. However, traditional deep neural network models typically suffer from high computational complexity and large parameters, whic...

Asymmetric deflagration characteristics of hydrogen-blended natural gas under multiscale conditions: The influence of ignition location

Hydrogen-blended natural gas (HBNG) is receiving increasing attention as a practical low-carbon gaseous fuel for the transition of natural-gas-based energy systems, but its vented deflagration behavior in partially confined spaces remains insufficiently understood, especially whe...

Influence of ammonia blending on soot formation and nanostructure in laminar n-decane diffusion flames

Ammonia blending with hydrocarbon fuels has drawn increasing attention as a strategy for reducing soot emissions and mitigate combustion related particulate pollution. In this study, the influence of ammonia addition on soot formation and structural evolution was investigated in...

An LLM-assisted optimization algorithm for energy-efficient flexible job shop scheduling problem with unreliable machines and AGVs

With technological advancements, the influence of small-batch flexible production models in manufacturing continues to grow, making the flexible job shop scheduling problem a key approach to addressing these industry challenges. Simultaneously, the impact of random machine failur...

Interpretable Spatiotemporal Coupling Network for Robust Emission Prediction and Implicit Mechanism Mining in Sludge Gasification

Abstract Thermochemical gasification is a vital green technology for sewage sludge reduction and resource recovery, yet real-time emission forecasting remains exceptionally challenging due to chaotic operational fluctuations, pronounced time lags, and noisy sensor data. Conventio...

4D printed shape memory alloy metamaterial with tunable energy absorption and vibration isolation

The harmonious integration of energy absorption and vibration isolation strategies in metamaterial design is demonstrated to significantly enhance performance efficiency under complex dynamic loads. A novel metamaterial featuring tunable shape along with controllable energy absor...

Universal synthesis of high-entropy alloy nanostructures with femtosecond lasers

High-entropy alloy nanostructures (HEA-NSs) hold promise in advanced catalysis and materials science, but lack a robust and universal synthetic strategy designed at an atomic level. Here, femtosecond lasers are used to prepare HEA-NSs, from single atoms to 100 nm nanoparticles, e...

Dipole–dipole interaction facilitates anion-rich solvation structures in polymer electrolytes for solid-state lithium metal batteries

Polymer electrolytes are vital for safe and high-energy–density lithium metal batteries but face challenges from interfacial instability and Li dendrites. Here, we report a molecular design exploiting dipole–dipole interactions to tailor Li + solvation structures and interfacial...

Null controllability for degenerate parabolic equations with internal control applied on a measurable subset

This paper investigates the null controllability of a class of two-dimensional linear parabolic equations with a boundary degeneracy on the domain Ω = 𝕋 × ( 0 , 1 ) , where the internal control acts on a space-time measurable subset of positive measure. Unlike conventional open c...

Posterior insula activity is associated with VR sickness severity after prolonged immersion: a resting-state fMRI study

The neural mechanisms underlying virtual reality (VR) sickness remain poorly understood. This study explored neural alterations following prolonged VR immersion and their associations with VR sickness severity using resting-state functional magnetic resonance imaging (fMRI). Frac...

NCCT-based habitats and peri-tumoral radiomics enhance pre-operative prediction of benign and malignant sacral tumors

Abstract Background Differentiating between benign and malignant sacral tumors is essential for guiding treatment strategies. This study aims to develop a novel approach utilizing non-contrast computed tomography (NCCT) for the accurate classification of sacral tumors. Methods Fr...