Explanipedia

Spatial dependencies and long-run dynamics of the Environmental Kuznets Curve in West Africa: an analysis of growth vs. emissions Open

Decai Tang, Valentina Boamah, Qiang Ding, Junqiang Bai · 2025

Validating the Environmental Kuznets Curve (EKC) hypothesis has been a core subject for decades. Still, its universality is contested in contemporary studies due to prior region-specific outcomes. Comprehensively estimating its applicabili…

Correlating Cross-Iteration Noise for DP-SGD using Model Curvature Open

Xin Gu, Yingtai Xiao, G. He, Junqiang Bai, Daniel Kifer , et al. · 2025

Differentially private stochastic gradient descent (DP-SGD) offers the promise of training deep learning models while mitigating many privacy risks. However, there is currently a large accuracy gap between DP-SGD and normal SGD training. T…

Towards Better Optimization For Listwise Preference in Diffusion Models Open

Junqiang Bai, Xin Yu, Meilong Xu, Wenhui Lu, Xin Pan , et al. · 2025

Reinforcement learning from human feedback (RLHF) has proven effectiveness for aligning text-to-image (T2I) diffusion models with human preferences. Although Direct Preference Optimization (DPO) is widely adopted for its computational effi…

FlowerTune: A Cross-Domain Benchmark for Federated Fine-Tuning of Large Language Models Open

Yan Gao, Massimo Roberto Scamarcia, Javier Fernández-Marqués, Mohammad Fahim Naseri, Carl K.‐Y. Ng , et al. · 2025

Large Language Models (LLMs) have achieved state-of-the-art results across diverse domains, yet their development remains reliant on vast amounts of publicly available data, raising concerns about data scarcity and the lack of access to do…

Nonlinear aeroelastics of a three-degree-of-freedom airfoil with control surface hysteresis stiffness in a dynamic stall flow Open

Jiahua Liang, Junqiang Bai, Zhiwei Sun, H. Xiao, Min Chang · 2025

Static Segmentation by Tracking: A Frustratingly Label-Efficient Approach to Fine-Grained Segmentation Open

Zhenyang Feng, Zihe Wang, Jianyang Gu, Samuel S. Bueno, Tomasz Frelek , et al. · 2025

We study image segmentation in the biological domain, particularly trait and part segmentation from specimen images (e.g., butterfly wing stripes or beetle body parts). This is a crucial, fine-grained task that aids in understanding the bi…

Aerodynamic performance analysis of different damaged types of a turboprop wing Open

Yuanzhuo Geng, Bo Pang, Yuansong Liu, Zhaoqi Gao, Junlin Li , et al. · 2025

Wingtiploss and bullet impact are potential hazards faced by existing transport aircraft, posing a serious threat to flight safety. These damages create asymmetric rolling moments that lead to aircraft instability and aerodynamic degradati…

Pore‐Throat Differences Across Flow Units in Low‐Permeability Sandstone Reservoirs: Impact on Movable Fluid Saturation in the Triassic Chang 6 Reservoir, Jiyuan Oilfield, Ordos Basin, China Open

Pan Li, Jian Yan, Rui Hu, Ming Han, Junqiang Bai · 2025

Low‐permeability sandstone reservoirs, as a subset of unconventional oil and gas reservoirs, have gained significant attention due to their distinct exploration and development potential. These reservoirs exhibit intricate heterogeneity, v…

Improved Aerodynamic-Propulsion Integration Model for Distributed-Electric-Propulsion System and its Integration in Sizing for Hybrid-Electric Distributed-Propulsion Aircraft Open

Li Li, Lei Qiao, Jiakuan Xu, Junqiang Bai · 2025

Improved Model for Hydrogen Fuel Cell System Design and its Integration in Sizing for Hybrid-Electric-Propulsion Aircraft Open

Li Li, Lei Qiao, Jiakuan Xu, Junqiang Bai · 2025

Investigation Of An Extended Single Particle Model Incorporating Electrolyte Kinetics, Temperature Effects, and Side Reactions for Improved Battery Performance Simulation Under High Charge/Discharge Rates and Low-Temperature Open

Yuan Li, J.F. Nie, Zhongyi Xue, Junqiang Bai, Qing’an Li · 2025

Quasi-three-dimensional high-lift wing design approach considering three-dimensional effects of slipstream for distributed electric propulsion aircraft Open

Tianshi Cao, Junqiang Bai, Yasong Qiu, K. Han, Shaodong Feng , et al. · 2024

The efficient utilization of propeller slipstream energy is important for improving the ultra-short takeoff and landing capability of Distributed Electric Propulsion (DEP) aircraft. This paper presents a quasi-three-dimensional (2.5D) high…

Data-driven surrogate model for aerodynamic design using separable shape tensor method Open

Bo Pang, Yang Zhang, Junlin LI, Xudong Wang, Min Chang , et al. · 2024

In the context of increasing dimensionality of design variables and the complexity of constraints, the efficacy of Surrogate-Based Optimization (SBO) is limited. The traditional linear and nonlinear dimensionality reduction algorithms are …

Parameter effect on the novel swashplateless rotor control Open

Linkai Tang, Min Chang, Yaping Huang, Siliang Zu, Junqiang Bai · 2024

To achieve underactuated control, a novel swashplateless rotor configuration of asymmetric inclined hinges which can be driven by periodic sinusoidal torque is studied, hopefully eliminating the conventional swashplate mechanism and multip…

A Novel Aerodynamic Performance Prediction Method Considering Viscous Effect for Ducted Fan-Wing Coupling Configuration Open

K. Han, Junqiang Bai, Tianshi Cao, Shilong Yu, Shaodong Feng , et al. · 2024

Trajectory Planning and Control Design for Aerial Autonomous Recovery of a Quadrotor Open

Dongyue Du, Min Chang, Linkai Tang, Haodong Zou, Chu Tang , et al. · 2023

One of the most essential approaches to expanding the capabilities of autonomous systems is through collaborative operation. A separated lift and thrust vertical takeoff and landing mother unmanned aerial vehicle (UAV) and a quadrotor chil…

Effects of Static Stability Margin on Aerodynamic Design Optimization of Truss-Braced Wing Aircraft Open

Li Li, Lei Qiao, Jiakuan Xu, Junqiang Bai · 2023

Currently, the aviation industry is facing an oil and energy crisis and is contributing much more greenhouse gas emissions to the environment. Aircraft design approaches, such as aerodynamic shape optimization, new configuration concepts, …

Performance analysis and flow mechanism of channel wing considering propeller slipstream Open

Xiaoxuan Meng, Ziyi XU, Min Chang, Junqiang Bai · 2023

The development of the Urban Air Mobility concept has proposed stringent requirements for the fixed-wing vehicle's Short/Vertical Take-Off and Landing (S/VTOL) performance. With its lift-enhancing impact, the channel wing, can improve airc…

Aerodynamic Optimization Design of Supersonic Wing Based on Discrete Adjoint Open

Hanyue Rao, Yayun Shi, Junqiang Bai, Yifu Chen, Tihao Yang , et al. · 2023

Reducing fuel consumption and improving the economy by effectively reducing cruising drag is the main objective of the aerodynamic design of supersonic civil aircraft. In this paper, the aerodynamic optimization design system based on the …

Multi-point aero-structural design optimization of wings considering drag-divergence constraints Open

Yu Zhang, Junqiang Bai, Feng Qu · 2023

Considering the drag-divergence performance as a constraint, this paper presents a multi-point aero-structural design optimization of wings on a wing-body-tail-engine configuration of long-range dual-aisle civil aircraft by using a gradien…

Adjoint-based robust optimization design of laminar flow wing under flight condition uncertainties Open

Yifu CHEN, Hanyue Rao, Yiju DENG, Tihao Yang, Yayun Shi , et al. · 2023

It is an inherent uncertainty problem that the application of laminar flow technology to the wing of large passenger aircraft is affected by flight conditions. In order to seek a more robust natural laminar flow control effect, it is neces…

Study on design characteristics of airfoil pressure distribution for low Mach number general aircraft Open

Yu Zhang, Junqiang Bai, Feng Qu · 2023

This paper studies several problems that may exist in the aerodynamic design of low Mach number general aircraft, and discusses the design characteristics of the pressure distribution of some related airfoils while part of the characterist…

Fluid mechanism analysis on the interaction between natural laminar flow nacelle and wingbody on a transonic aircraft Open

M. H. Zhang, Xiaoxuan Meng, Maosheng Wang, Wang Hui, Junqiang Bai , et al. · 2022

A transonic natural laminar flow (NLF) nacelle, which is a streamlined fairing used to contain a turbofan engine and mounted under the wing of civil aircraft, can reduce friction drag. Because the fluid mechanism of the interaction between…

Electrical Characteristics of Photovoltaic Cell in Solar-Powered Aircraft During Cruise Open

Peimiao Li, Wang Hui, Min Ho Chang, Junqiang Bai · 2022

Aiming to study the electrical characteristics of photovoltaic cells during the flight of solar-powered unmanned aerial vehicles, this work combines a photovoltaic cell equivalent circuit model and a thermodynamic model. The influence of w…

Impact Response Prediction Method of Packaging Systems with a Key Component considering Different Excitations and Cushioning Materials Open

H. Xiao, Chizhen Xu, Focai Yuan, Xudong Zhang, Junqiang Bai , et al. · 2022

Nonlinear dynamic models of the packaging systems that consider different excitations and cushioning materials are proposed to analyze their impact responses in this paper. To solve the nonlinear dynamic equations of the models, Newmark me…

A Nonlinear Model and Parameter Identification Method for Rubber Isolators under Shock Excitation in Underwater Vehicles Open

H. Xiao, Chizhen Xu, Ruobing Wang, Peixun Yu, Jie Zhou , et al. · 2021

Rubber isolators are usually used to protect high-precision equipment of autonomous underwater vehicles (AUVs), avoiding damage from overlarge dynamic excitation. Considering the nonlinear properties of the rubber material, the nonlinear b…

A Review of Riemann Solvers for Hypersonic Flows Open

Feng Qu, Di Sun, Qingsong Liu, Junqiang Bai · 2021

Exploration of high-altitude dynamic soaring based on six-degree-of-freedom model Open

Siqi Liu, Junqiang Bai · 2021

Dynamic soaring is an emerging flight range-extension technology that effectively reduces UAV's energy consumption by deriving wind energy from lateral gradient wind fields. Comparing with the small UAV's near the surface, the application …

Multi-object aerodynamic design optimization using deep reinforcement learning Open

Xinyu Hui, Wang Hui, Wenqiang Li, Junqiang Bai, Fei Qin , et al. · 2021

Aerodynamic design optimization is a key aspect in aircraft design. The further evolution of advanced aircraft derivatives requires a powerful optimization toolbox. Reinforcement learning (RL) is a powerful optimization tool but has rarely…

Radar Cross Section Reduction and Shape Optimization using Adjoint Method and Automatic Differentiation Open

Ming Li, Junqiang Bai, Feng Qu · 2021

An efficient Radar Cross Section (RCS) gradient evaluation method based on the adjoint method is presented. The Method of Moments is employed to solve the Combined Field Integral Equation (CFIE) and the corresponding derivatives computing …

Junqiang Bai YOU? Author Swipe