Qingdao University of Technology

High-temperature mechanical properties of basalt fiber-reinforced concrete after salt spray erosion

To investigate the durability performance of basalt fiber-reinforced concrete (BFRC) subjected to the coupled effects of salt spray erosion and fire-induced high temperatures, this study systematically conducted combined exposure tests with salt spray durations (0, 30, 90, and 18...

Finite-time H ∞ control for singularly perturbed systems subject to finite-frequency specification

This paper investigates the design of a parameter-independent finite-time H∞ controller for singularly perturbed systems to address numerical ill-conditioning and enhance robustness under finite-frequency specifications. By integrating the descriptor-system approach with the gene...

A source-to-sea decision-support framework for wet-weather wastewater load management: evidence from Jiaozhou Bay

Coastal concentration compliance can overlook increased wastewater throughput during wet weather. We developed a source-to-sea decision-support framework using 2019–2022 wastewater, river, and marine observations from Jiaozhou Bay, China. The analysis combined source-record audit...

Beyond Single‐Cause Explanations: An Integrated Framework for Crisis Learning in Public Organisations: A Survey Experiment in China

ABSTRACT Drawing on performance feedback, attribution, and accountability theory, this study investigates how the frequency of crises, the type of causal attribution, and the geographic location of an event jointly influence crisis learning among Chinese public sector actors. The...

Analytical study on the vibration of spatial plate-plate coupled structures with combined simply supported and clamped edges

Spatial plate-plate coupled structures (cross, L, and T-shaped) are fundamental elements in engineering, yet a unified solution covering multiple coupling configurations, arbitrary coupling angles, and combined simply supported-clamped boundaries remains unavailable. This study d...

Trends in greenhouse gas emissions from China’s municipal solid waste sector at urban and county levels: key drivers and mitigation strategies

Significant changes have occurred in China’s municipal solid waste (MSW) management methods over the last two decades, yet comprehensive assessments of greenhouse gas (GHG) emission patterns and their driving factors remain limited. In this study, GHG emissions from the urban and...

Dynamic contact angle model of bionic micro-abrasive droplet wetting and experimental study

Micro-grinding techniques are widely used in orthopedic surgeries involving bone tissue removal. However, insufficient dynamic wetting of coolant droplets on rotating micro-grinding tools can disrupt coolant coverage and interfacial heat transfer, causing thermal damage during bo...

Thermo-mechanically driven dynamic recovery and residual stress relaxation in high-efficiency deep grinding of single-crystal superalloys

High-efficiency deep grinding (HEDG) is an important process for machining single-crystal superalloy turbine blades, whereas the severe thermo-mechanical coupling and ultrahigh strain rates involved make the evolution of subsurface residual stress difficult to predict accurately....

Nanoscale Mechanisms of Corrosion Threshold: Effects of Passivation Film Crystal Structures

Abstract The corrosion resistance of passive films on reinforcing steel is fundamentally governed by the depassivation stability of iron oxide polymorphs under chloride-containing environments. In this study, the electrochemical behavior and atomistic depassivation mechanisms of...

Integrating multiple methods for predicting the electrochemical corrosion evolution of hybrid fiber reinforced concrete under marine exposure environment

Fiber reinforcement effectively improves concrete chloride penetration resistance, while its anti-corrosion performance for steel reinforcements varies with fiber type, dosage and exposure conditions. This study adopted electrochemical tests, COMSOL mesoscale simulation and the g...

Dynamics and observational signatures of warm Dirac–Born–Infeld inflation with nonminimal derivative coupling

Abstract This paper investigates a warm Dirac–Born–Infeld (DBI) inflationary model with nonminimal derivative coupling (NMDC) to gravity, where the inflaton kinetic term interacts with the Einstein tensor, thereby improving the effective gravitational friction. This model seamles...

Calcium-leaching-resistant shotcrete for subsea tunnels: Effects of alkali-free accelerator, early-strength material and leaching inhibitor

Calcium leaching can reduce the long-term mechanical capacity of shotcrete used as primary support in subsea tunnels. This study investigated the effects of an alkali-free accelerator, an early-strength material (ESM), and a leaching inhibitor on the strength development, pore st...

Prediction model for compressive strength of alkali-activated multi-source solid-waste grouting materials based on generative adversarial networks and machine learning

Alkali-activated multi-source solid-waste grouting materials have attracted increasing attention in geotechnical and underground engineering due to their low carbon footprint, environmental friendliness, and potential for large-scale resource utilization. However, the complex com...

A ROS 2-Based Robotic Platform for Mobile Occupant Sensing and Edge Perception in Buildings

Occupant-centric building operation requires timely information on occupant states and local indoor conditions, but fixed sensors provide limited spatial coverage, and wearables depend on user participation. This study develops a Robot Operating System 2 (ROS 2)-based wheeled mob...

Airflow organisation for reducing thermal disparities amongst surgical staff while maintaining air cleanliness in operating rooms

Operating room ventilation systems are designed to ensure air cleanliness and reduce the risk of surgical site infections. However, the thermal comfort of surgical staff is often overlooked. The present study investigated whether airflow organisation can reduce thermal disparitie...

A Lightweight Satellite Orbit Anomaly Detection Method Based on Peak-AAE and Its Edge Deployment

The detection of orbital anomalies is of critical importance to the safe operation of on-orbit spacecraft. Existing methods often rely on manually engineered features and are constrained by the limited computational resources of satellite equipment. This paper proposes a lightwei...

Geometric frustration and strain-engineered magnetic phase transitions in the pentagonal FeS 2 monolayer

Two-dimensional pentagonal materials have recently emerged as a promising platform for exploring novel magnetic phenomena. Using first-principles calculations, we systematically investigate the strain-tunable optical and magnetic properties of $\mathrm{penta}\text{\ensuremath{-}}...

Optimization of a Highway Tunnel Bottom Structure in Three-Layer Upper-Soft and Lower-Hard Composite Ground Using Physical and Numerical Models

Tunnel excavation in ground comprising a soft upper stratum and a hard lower stratum posed significant challenges, particularly during invert construction using drilling-and-blasting methods, which could disturb the surrounding rock and the installed support system. To address th...

Design, Fabrication, and Performance Study of 3D‐Printed Multi‐Tooth Interlocking Discrete Functionally Gradient Stretchable Substrates

ABSTRACT Flexible hybrid electronics (FHE), which integrate the deformation capability of flexible substrates with the functional stability of rigid components, show broad application prospects in wearable devices and aerospace fields. Among these, functionally graded substrates...

An efficient surrogate-assisted hybrid optimization framework for polymer flooding management

<title>Abstract</title> Reservoir injection-production optimization plays a critical role in enhancing recovery in high-water-cut oilfields. While polymer flooding improves development efficiency by increasing viscosity and controlling fluid flow, its optimization faces several c...