China Three Gorges University

Study on mechanical behavior of reinforced concrete (RC) beams strengthened with ultra-high performance concrete (UHPC)

The mechanical characteristics and the calculation method for the normal section bearing capacity of reinforced concrete (RC) beams strengthened with ultra-high performance concrete (UHPC) were investigated. The effects of the reinforcement ratio and UHPC layer thickness on the m...

Survival-aware self-play reinforcement learning for partially observable beyond visual range air combat

We present a recurrent self-play reinforcement learning framework for autonomous beyond-visual-range (BVR) air combat under partial observability. The environment is formulated as a decision-level BVR missile-duel simulator that combines 3-DoF aircraft kinematics, field-of-view r...

Synthesis of Pyrroloquinazolinones via Base-Promoted Domino Reaction of 7-Vinylindoles with In Situ Formed Isocyanates from Dioxazolones

Abstract Herein, we report a novel base-promoted domino reaction between 7-vinylindoles and dioxazolones, enabling the efficient one-pot synthesis of pyrroloquinazolinone scaffolds in moderate to excellent yields (up to 95%). This transition-metal-free protocol employs readily av...

Synthesis of Calcium Sulfate Nanocrystals via Confined Reaction in Ion-Enriched Instantaneous Microdomains

Abstract Hemihydrate calcium sulfate nanocrystals hold promising potential in biomedical and industrial applications. Conventional synthesis methods typically necessitate high temperatures/pressures, acidic/alkaline media, or expensive organic reagents. This study proposes a faci...

Analysis of care needs for primary caregivers of premature infants at home based on the Kano model: A cross-sectional study

Objective This study applied the Kano model to analyze the attributes of care needs among primary caregivers of discharged premature infants(up to 6 months post discharge), identify priority needs, and provide a foundation for developing targeted nursing service plans. Methods Be...

Effectiveness of multi-source merged soil moisture products using different triple collocation methods: A comprehensive assessment incorporating spatial similarity evaluation framework

Evaluation of soil moisture products and data merging efforts have commonly focused on their performance in representing temporal dynamics, while overlooking the capacity of the products to capture spatial patterns. In this study, a spatial evaluation framework based on the Struc...

Spatiotemporal Variation Analysis of Groundwater Storage in Huaihe River Basin Based on GRACE and Interpretable Machine Learning

Groundwater represents an essential water resource across the Huaihe River Basin, and its sustainable use is important for maintaining regional water resource security. This study systematically examined the long-term evolution, seasonal variability, and major drivers of groundwa...

Coordinated planning of hydrogen refuelling stations and distribution networks considering two-phase hydrogen storage and carbon emission flow

Hydrogen refuelling stations (HRSs) are essential infrastructure for hydrogen-powered transportation. However, their planning faces coupled challenges arising from high-pressure hydrogen storage risks and the indirect carbon emissions caused by grid-connected electrolysis. To thi...

Electromagnetic properties and microwave absorption enhancement mechanism of graphene-regulated Fe-Co-Zn-O@C composites

With the rapid development of high-frequency electronic technology, pollution caused by electromagnetic radiation has grown more serious. Consequently, creating high-performance microwave absorbing materials featuring “light weight, thin thickness, broad bandwidth, and strong att...

Planes on Fourfolds Defined by Sums of Binary Forms

We study planes on complex projective fourfolds defined by sums of three squarefree binary forms of the same degree d ≥ 3 in disjoint pairs of variables. We first establish a three-block rigidity theorem: if a plane has rank-two projection to each of the three binary blocks, then...

Biochar-based mediation of urease-producing bacteria for enhanced sandy soil stabilization and plant growth adaptability

Wind erosion is a major driver of sandy soil degradation in arid and semi-arid regions. Improving soil structural stability while maintaining conditions favorable for vegetation establishment remains a key challenge for sandy-land management and revegetation. In this study, poorl...

The bidirectional relationship between gut microbiota and the development of colorectal cancer

Background As a core component of the human intestinal microecosystem, the gut microbiota has been increasingly recognized for its pivotal role in colorectal cancer (CRC), a globally prevalent malignancy with rising incidence and mortality rates. The association between intestina...

The miR‑339‑3p/CIZ1 axis is associated with LPS‑induced microglial injury and sevoflurane‑associated cognitive impairment in aged rats

Postoperative cognitive dysfunction (POCD) substantially impairs the quality of life in elderly patients, but its underlying molecular mechanisms remain largely elusive. This study aimed to investigate miR‑339‑3p expression and its functional role in LPS‑induced microglial injury...

Therapeutic targeting of the SLC39A13-AS1/TCF20/RUNX1 axis inhibits glutamine metabolism and ovarian cancer progression

“Glutamine addiction” is among the key features of tumor metabolic reprogramming and is an important target for tumor therapy. Unfortunately, the mechanisms underlying the abnormal expression of genes related to glutamine metabolism in ovarian cancer (OC) remain unclear. Here, we...

Generating the symmetric group by three prefix reversals

The cubic pancake graphs are Cayley graphs over the symmetric group $\mathrm{Sym}_n$ generated by three prefix reversals. There is the following open problem: characterize all the sets of three prefix reversals that generate $\mathrm{Sym}_n$. As the largest prefix reversal of len...

Flood damage estimation and disaster perception using multi-source data: a case study of Henan, China

Urban flood is becoming increasingly frequent worldwide, posing a serious threat to life and property. Accurately assessing flood damage is critical for risk management and flood prevention. However, traditional estimation methods are resource-intensive and untimely. Previous stu...

The evolution of composition and thermal conductivity of the ITZ in the early age concrete: model and experiment

The Interfacial Transition Zone (ITZ) thermal properties are critical for early-age thermal crack initiation in concrete. This study developed a model combining equivalent water-cement ratio (w/c) theory and the Mori-Tanaka method to predict the evolution of the ITZ's composition...

Using a UE5 Platform Based on Point Cloud to Develop the Digital Twin System of a Lianziya Scenic Spot in Xilingxia of the Yangtze River in China

Abstract Addressing the challenges of complex terrain modeling and poor real-time interactivity in geologically sensitive areas, this study presents a digital twin system construction method based on the Unreal Engine 5 (UE5) platform. Taking the Lianziya dangerous rock mass in t...

Calculation of the local ground-level total electric field near a tower in a multi-circuit AC-to-DC conversion project based on an improved upwind finite element method

To address the problems of complex ion-flow space-charge distribution in AC-to-DC converted transmission lines under wind action, and the tendency of the conventional upwind finite element method to suffer from iterative oscillations and convergence difficulties, this paper propo...

Data-Driven Adaptive Reactive Power and Voltage Control Method for Distribution Networks with Energy Storage by Using DRL-SAC Algorithm

In distribution network and microgrids, energy storage (ES) systems possess four-quadrant operational capabilities, making them inherently high-quality resources for reactive power (RP) regulation. However, existing research has primarily focused on optimizing the active power of...