North China Electric Power University

Conditional Land Reuse Planning for Coal Mine Restoration in China: Evidence of Robustness and Restoration-Funding Scenarios

Land-reuse planning after coal mining must distinguish restoration needs, evidential readiness and the ability to fund continuing obligations. This study examines that distinction through 69 Chinese mine-area units, six purposively selected coal-related electricity statements and...

An experimental investigation of flow boiling heat transfer characteristics and the triggering mechanisms of CHF in a natural circulation loop under moderate to low driving forces

Flow boiling heat transfer, flow instability, and critical heat flux (CHF) were investigated experimentally in a vertical R134a natural circulation loop with an integrated reservoir. Tests on flow heat transfer characteristics and flow visualization were conducted at filling rati...

Molecular Structure Design of Heat-Resistant Cycloolefin Polymer Based on Machine Learning

Abstract Traditional biaxially oriented polypropylene (BOPP) is widely used in capacitors of converter valves, but its high-temperature performance is gradually approaching its design limit. Cycloolefin copolymer/polymer (COC/COP) materials are explored as promising alternatives...

An Integrated Image Generation and Collaborative Training Framework for Transmission-Line Foreign-Object Detection

Foreign objects on power transmission lines pose a serious threat to the safe and stable operation of smart grids. Currently, deep learning-based detection models have become the mainstream method for detecting foreign objects on transmission lines. However, all foreign objects a...

Experimental study of void fraction and its distribution characteristics in vertical narrow rectangular channels

Two-phase flow in narrow rectangular channels is of continued interest in multiphase flow research because of its importance in compact heat transfer applications. Gas-liquid flow in these geometries exhibits complex interfacial behavior and flow-regime transitions driven by the...

Differentiated time-frequency envelope kurtosis-gram guided adaptive variational multi-harmonic mode extraction for fault diagnosis of offshore wind turbine slewing bearings

Early fault characteristics of offshore wind turbine slewing bearings are weak and easily masked by noise, making accurate extraction difficult. To address this problem, a differentiated Time-Frequency Envelope Kurtosis-gram (TFEKgram) guided Adaptive Variational Multi-Harmonic M...

An Efficient Error-Controlled POD Reduced-Order Collocation Spectral Method for Unsteady Incompressible Navier–Stokes Equations

The efficient numerical solution of the unsteady incompressible Navier–Stokes equations requires a balance between computational accuracy and efficiency. Although spectral methods provide high-order spatial approximation, the dense algebraic systems generated by their global disc...

Molecular Coordination–Driven Photothermally Stable FACs‐based Perovskite Solar Cells with Efficiency Over 25% via Dicarbonyl‐Functionalized Thienoacene Small Molecule

ABSTRACT The practical deployment of perovskite solar cells (PSCs) is critically hindered by their susceptibility to moisture, oxygen, and thermal degradation, particularly under high‐temperature and high‐humidity conditions. Herein, we design and synthesize a dicarbonyl‐function...

Analysis of cold energy loss characteristics and improvement of liquefaction cycle methods in liquid air energy storage systems

Liquid air energy storage system plays a crucial role in maintaining grid stability. The cold storage packed bed constitutes a critical component of the system. In existing studies, few have investigated the influence of multiple cycles of the packed bed under non-ideal condition...

Multi-objective optimal dispatch of pumped storage in renewable-dominated hydro-wind-PV regional power systems

With the accelerated global energy transition, the installed capacity of wind and photovoltaic (PV) power continues to increase, making renewable-dominated power systems increasingly prevalent. However, the variability, intermittency, and limited controllability of wind and PV ge...

Flexible Day-Ahead Scheduling of a Cascade Hydro-Wind-Solar-Thermal-Storage System Including Hybrid Pumped Storage

To advance the modernization of power systems, the role of hydropower has transitioned from mere energy generation to serving as both a primary energy provider and a critical flexibility resource. However, conventional day-ahead scheduling methodologies for cascaded hydropower of...

Co-enhancement of energy efficiency and dynamic flexibility for indirect air-cooled systems under frequent peak-shaving: Trade-offs of cost, performance and robustness

Deep peak-shaving operation of coal-fired power units requires heat-exchange equipment to rapidly track varying loads. Indirect air-cooled units are central to power supply in water-scarce regions, and their cold-end system rejects heat to ambient air and possesses substantial th...

Modeling and hierarchical energy storage dispatch control of a pulverized coal buffer unit for flexible operation of coal-fired power plants

With the increasing integration of renewable energy, coal-fired power units require higher operational flexibility. However, the delays caused by raw coal grinding and pulverized coal transport in conventional direct fired pulverizing systems limit rapid load response. To address...

Adaptive Damping Control for Stability Enhancement of Grid-Following Converters Based on q-Axis Voltage Magnitude Feedback

Grid-following converters are prone to transient synchronization instability during grid faults, which may lead to the disconnection of renewable energy devices and threaten the security and stability of power systems. To address this issue, this paper first establishes a second-...

Comparative analysis of heat–power decoupling technologies and hot-water tank optimization for deep peak shaving of a 350 MW supercritical combined heat and power unit

To improve the deep peak-shaving capability of combined heat and power (CHP) units under high-penetration renewable energy integration while maintaining heating security and operational economy, this study investigates a 350 MW supercritical extraction heating unit. An off-design...

MoO3 Doping Modulates CeO2/TiO2 Catalysts for Simultaneous NO x Reduction and Toluene Oxidation in Alkali-Rich Flue Gas: Unraveling the Microscopic Electronic Origin via DFT Calculations

Abstract CeO2/TiO2 catalysts are prone to severe deactivation in KCl-enriched flue gas environments derived from biomass or solid waste combustion during the removal of NO and toluene. While MoO3 doping significantly improves their resistance to KCl poisoning, the microscopic int...

Comparative corneal biomechanical characteristics in polypoidal choroidal vasculopathy and neovascular age-related macular degeneration analyzed by corvis ST: a cross-sectional study

To explore the differences in corneal biomechanical characteristics among patients with polypoidal choroidal vasculopathy (PCV), neovascular age-related macular degeneration (nAMD), and healthy individuals. This cross-sectional study included patients with nAMD or PCV and healthy...

Whether smaller guest droplets facilitate hydrate conversion: Effects of nanodroplet size and droplet interactions from molecules perspective

To overcome the self-limiting of hydrate formation, dispersing the guest phase into smaller droplets to create more guest-water interfaces provides an effective strategy for enhancing hydrate conversion. However, dispersing the guest phase into a larger number of smaller droplets...

Investigation of the heat transfer of supercritical carbon dioxide in a vertical tube under high-temperature and high-pressure conditions

The design and refinement of the supercritical carbon dioxide (S-CO 2 ) direct cycle nuclear energy system are crucial for advancing the application of green energy and mitigating the energy crisis. The key to this lies in the research on the heat transfer characteristics of S-CO...

Parameter decoupling analysis and equipment-constrained multi-objective optimization of electrochemical–thermodynamic synergy for a SOFC–semi-closed CO2 Brayton cycle hybrid system

To achieve efficient near–zero–carbon power generation, this study focuses on a hybrid system integrating a solid oxide fuel cell (SOFC) with a semi–closed CO 2 Brayton cycle. This configuration offers both high efficiency and inherent CO 2 capture, yet supercritical operation is...