China Power Engineering Consulting Group (China)

Heat Transfer Performance of Medium-Deep Coaxial Geothermal Wells: A Case Study in Changsha, China

A coupled model integrating three-dimensional heat transfer in the geological formation with one-dimensional non-isothermal flow in the wellbore was developed for medium-deep coaxial geothermal wells under the geological conditions of Changsha, Central-South China. The effects of...

Dynamic and techno-economic assessment of solar-assisted biomass gasification for continuous hydrogen production

Solar-driven biomass gasification offers a promising route to produce green hydrogen while storing solar energy in chemical form. To mitigate solar intermittency, a solar/autothermal hybrid gasification strategy based on solar-input-dependent adjustment of gasifying-agent ratios...

Experimental and numerical study on hysteretic performance of aluminum alloy weak-axis beam-to-column joint connected by ring-groove rivets

This study experimentally and numerically investigates the hysteretic behavior of aluminum alloy weak-axis joints connected by ring-groove rivets. Two full-scale cruciform joint specimens were tested, incorporating stainless steel side plate connections with different configurati...

Transition Mechanism of Promotion/Inhibition of Ice Accretion on Overhead Ground Wires Under Electric Field Effects

Ice accretion on overhead ground wires is a significant hazard threatening the safe operation of power systems. The electric field exerts a complex bidirectional effect—both promoting and inhibiting—on ice growth, and the underlying mechanism of this transition remains unclear. T...

Effects of graphene nanoplatelets and carbon nanotubes on the mechanical–electrochemical performance and hydration evolution mechanisms of solid-waste-based cementitious structural electrodes

Abstract Building-integrated distributed energy storage offers a promising route toward energy self-sufficiency in buildings. In this study, industrial solid-waste-based composite structural electrodes were fabricated by incorporating graphene nanoplatelets (GNP) or carbon nanotu...

Multi-Market Joint Optimization and Cooperative Benefit Allocation for Wind–PV–Thermal–Storage Aggregators Considering Battery Degradation Cost

High penetrations of wind and photovoltaic (PV) generation increase renewable-output uncertainty, balancing-market exposure, and the demand for flexible ancillary services. This paper proposes a multi-market stochastic optimization and cooperative benefit-allocation framework for...

Multi-Timescale Optimal Scheduling of a Renewable Power to Ammonia System with a Variable Medium-Term Horizon

Renewable Power to Ammonia (RePtA) systems provide an important pathway for the accommodation of renewable energy and promoting the low-carbon transition of the conventional ammonia industry. With the increasing penetration of renewable energy in power systems, output fluctuation...

Micro pore structure evolution of a loess-paleosol sequence and its control on macro hydraulic properties

The geo-hydrological and hydro-mechanical properties of loess–paleosol sequences on the Chinese Loess Plateau are critical to groundwater migration, stratigraphic stability, geohazard mitigation, and deep geotechnical engineering. This study investigated samples from a 1–30 m loe...

Offshore Wind Farm Pile Foundations as Vertically Heterogeneous Habitats: Beta Diversity Partitioning and Functional Trait-Combination Richness of Epifaunal Communities

Ecological evidence for epifaunal communities on offshore wind farm structures remains geographically concentrated in temperate Northeast Atlantic systems, whereas comparable studies from the subtropical Northwest Pacific remain limited. We sampled upper, middle, and lower layers...

UAV-Based Transmission Tower Inspection Using Hierarchical Multitask Learning Under Heterogeneous Supervision

Unmanned aerial vehicle (UAV) inspection of transmission towers requires joint analysis of corridor geometry, tower components, and localized defects, whereas available datasets provide incompatible annotations at different scales. Tower-HMT is a hierarchical multitask network th...

Comparative Safety Assessment of Solid Gravity Energy Storage Pathways Using the Analytic Hierarchy Process

Solid gravity energy storage (SGES) has emerged as a promising long-duration energy storage option, but systematic safety comparisons among its principal technology pathways remain limited. This study develops a unified expert-based framework for the comparative safety screening...

Dynamic Responses of Groundwater Flow and Salt Transport to Storm Surge Inundation in Unconfined Coastal Aquifers

Abstract Storm surges severely salinize coastal aquifers, yet post‐storm subsurface hydrodynamics remain poorly understood. We investigated surge inundation in unconfined tidal aquifers, revealing that subsurface flow recovers much faster than salinity distributions. Immediately...

Controls of Sediment Grain Size and Bedform Dynamics on Scour Variability in a Strait‐Influenced Tidal Delta

ABSTRACT Scour development around offshore monopiles in the Eastern Mouth Tidal Delta (EMTD) of the Qiongzhou Strait was investigated based on field observations of bathymetry, hydrodynamic conditions and sediment grain size. The results reveal pronounced spatial variability in s...

Numerical and Physical-Model Investigation of Landslide-Generated Surge Waves from a Localized Unstable Zone in the Yangqu Canyon Reservoir: Wave Generation and Propagation

Surge waves generated by rapid landslide entry into canyon reservoirs can threaten near-dam hydraulic structures. This study examines a representative post-failure hydrodynamic scenario for the localized unstable Zone B of the No. 1 deformation body slope near Yangqu Hydropower S...

Pore and mineral controls on petrophysical anomalies in undercompacted mudstones

Abstract In mudstones, undercompaction inhibits grain rearrangement, preserving pores and generating anomalous petrophysical responses. These anomalies typically manifest in geophysical exploration as abnormal acoustic and resistivity logs. However, the microstructural difference...

Experimental study on the reinforcement performance of unloading-damaged mudstone by microbial grouting

<title>Abstract</title> To address the structural deterioration and water-induced swelling of mudstone caused by unloading damage during foundation excavation, grouting reinforcement tests using MICP and volcanic ash-assisted MICP were conducted. Mudstone specimens with unloading...

Numerical Study on the Stability of a Riprap for Submarine Cables and the Protective Solution Under Waterflow Incidence

This study presents a numerical investigation into riprap stability for submarine cable protection under high-speed incident waterflow conditions. A coupled CFD-DEM numerical model, implemented within the ANSYS 2024 R1 platform, was developed and validated against controlled labo...

A Comparison Study on the Dynamic Response of Rectangular and Circular Pile–Slab Retaining Walls Against Rockfall Impact

Abstract Pile–slab retaining wall (PSRW), as an innovative passive protection structure for mitigating rockfalls, has been extensively utilized in the western mountainous regions of China. A typical PSRW is composed of reinforced concrete piles, concrete slabs, and a soil cushion...

Rainfall-Pattern-Dependent Regulation of Hillslope Erosion by Vegetation Conservation Measures in Subtropical Hilly Farmland: A Multi-Method Analysis

The Southern Jiangsu hills region is located within the Yangtze River Delta Ecological Barrier. Soil erosion poses a threat to the development of commercial forests and the water quality of Lake Taihu, making it urgent to quantify the mechanisms by which vegetation and rainfall r...