Northwestern Polytechnical University

Gas ingestion mechanism and unsteady flow characteristics of fish-mouth rim seals in an axial gas turbine

Rim seals fitted between the turbine stator and adjacent rotor disc, together with sealing air bled from compressor to pressurize the wheel-space, serve to suppress hot gas ingestion from mainstream in axial gas turbines. This paper investigates the distributions of pressure, swi...

Spectrally stable dispersion matching for peridynamic approximation of periodic atomistic chains

Peridynamics and atomistic lattice models both describe motion through nonlocal interactions, but a generic peridynamic kernel does not necessarily reproduce atomistic dispersion. This article constructs a spectrally stable, dispersion-matched peridynamic approximation for one-di...

Hierarchical Multi-Agent Reinforcement Learning for Cooperative Wildfire Suppression with Amphibious Firefighting UAVs

Cooperative task planning for amphibious firefighting UAVs deployed across multiple bases is challenging because of complex resource coupling, evolving fire conditions, and real-time decision requirements. This study proposes an H-MAPPO-LSTM method with a three-level hierarchical...

LDF-Net: a transformer-based lightweight detail fusion network for UAV engineering vehicle detection

UAV engineering vehicle detection is a fundamental task for intelligent construction monitoring, as engineering vehicles directly reflect construction progress, equipment deployment, and potential safety risks in dynamic construction scenes. However, reliable detection in UAV con...

Deep diffusion prior for unsupervised super-resolution of diffusion-weighted images

Diffusion-weighted imaging suffers from low resolution, which adversely affects subsequent quantitative analysis. Recent deep learning-based super-resolution methods have shown promising performance in enhancing the resolution of diffusion-weighted images. However, most existing...

Equivalent End-Weakening Governing Crushing Modes and Crashworthiness of CFRP Tubes with Different End Triggers Under Quasi-Static Axial Compression

Quasi-static axial crushing tests were carried out on CFRP tubes with various end triggers (chamfer, tulip, crown, notch), aiming to reveal the joint regulation mechanism of geometric configuration and equivalent end-weakening on the crushing behavior of the tubes. Load–displacem...

Multidentate Coordination Enables Coupled Bulk Solvation and Interfacial Regulation for Stable Zinc Metal Anodes

ABSTRACT Aqueous Zn metal batteries are fundamentally constrained by the coupled instability of Zn 2+ solvation chemistry and interfacial reactions, which induces parasitic side reactions and non‐uniform Zn deposition. Here, we report a multidentate‐coordination electrolyte strat...

Multiscale Modeling of Hole Damage Evolution During Dynamic Installation of Interference Bushings in CFRP

ABSTRACT The dynamic installation of metal interference bushings has demonstrated significant potential for improving the mechanical performance of carbon fiber‐reinforced polymer (CFRP) joints. However, the underlying mechanisms governing the remaining life enhancement remain in...

Stepped‐Dimensional 2D/3D Tin‐Based Perovskites for High‐Efficiency Light‐Emitting Diodes

ABSTRACT Tin (Sn)‐based perovskite near‐infrared (NIR) light‐emitting diodes (LEDs) show great potential for applications in night vision, biomedical sensing, and optical communications. However, their performance remains limited by uncontrolled crystallization and the facile oxi...

Zinc-ion batteries for biomedical applications: Materials engineering, flexible device design, and biocompatibility

The booming development of wearable and implantable biomedical electronics urgently calls for next-generation energy-storage systems that integrate superior safety, mechanical flexibility, miniaturization, and biocompatibility. Lithium-ion batteries remain constrained in biomedic...

Co-option of a tendon-associated osteogenic program drives the evolutionary plasticity of intermuscular bones in teleosts

Intermuscular bones (IBs) are critical yet poorly understood evolutionary specializations. These bones exhibit considerable morphological variability, proposed as adaptations to teleost diversification; however, the explicit adaptive and evolutionary mechanisms remain unresolved....

A Millimeter-Wave Dual-Band Substrate Integrated Waveguide Filter with Complementary Split Ring Resonators

This paper presents a millimeter-wave dual-band bandpass filter based on a substrate integrated waveguide (SIW). The dual-band response is realized by embedding two pairs of complementary split-ring resonators (CSRRs) with different dimensions in the SIW cavity. Their geometry-de...

An optimal demodulation frequency band selection method based on Holo-Hilbert spectral analysis for propeller modulation feature recognition

The modulation spectrum of underwater propellers typically contains information on propeller structural characteristics, such as the shaft frequency and blade number. Detection of Envelope Modulation on Noise (DEMON) analysis is an effective method for underwater propeller modula...

Batch Scheduling on Parallel Machines With Submodular Costs

ABSTRACT This paper is motivated by the characteristics in the quenching and tempering process of steel workpieces, where the batch processing time is increasing and exhibits diminishing marginal returns. We model the batch processing time using submodular functions and study bat...

Reconfigurable Logic Operation of MoTe 2 Homojunction Enabled by Staggered Double‐Sided Contacts

ABSTRACT Reconfigurable transistors capable of dynamically switching between p‐ and n‐type operations are highly desirable for compact and energy‐efficient logic circuits. Here, we demonstrate a reconfigurable MoTe 2 transistor enabled by a staggered double‐sided contact (SDC) ar...

Synergistic mechanism of cavitation cloud cleaning: An experimental study on surface contaminant removal

Ultrasonic cavitation has emerged as an environmentally sustainable technique for the removal of marine biofouling and surface contaminants from submerged structures. However, cleaning performance cannot be adequately characterized by acoustic input alone because the collective t...

Manifold Learning with Implicit Physics Embedding for Reduced-Order Flowfield Modeling

Nonlinear manifold-learning (ML)-based reduced-order models (ROMs) can substantially improve the quality of nonlinear flowfield modeling. However, insufficient physical information often distorts the dimensionality-reduction process, reducing the robustness and accuracy of flowfi...

An integrated data-driven and experimental methodology for toroidal propeller design improvement

This study presents a data-driven hydrodynamic optimization framework for toroidal propellers. As a representative engineering application of artificial intelligence (AI), the framework offers an efficient route toward the advanced design of underwater propulsion systems. The fra...

Tool Wear and Failure Prediction in Machining Difficult-to-Machine Materials: A Review of Monitoring, Modeling, and Intelligent Manufacturing Technologies

Difficult-to-machine materials, including titanium alloys, nickel-based superalloys, hardened and high-strength steels, stainless steels, and fiber-reinforced composites, are widely used in advanced manufacturing but impose severe thermo-mechanical–chemical loads on cutting tools...

Al-Ti intermetallic formation by cold spraying and friction stir processing

This study proposes a method for the formation of Al-Ti intermetallic compounds. A dense Al/Ti alloy composite deposit with a porosity of less than 1% was first prepared by cold spraying. Friction stir processing was subsequently utilized to enhance interfacial diffusion and prom...