A5018718242- Plasma Diagnostics and Applications
- Electrohydrodynamics and Fluid Dynamics
- Magnetic Field Sensors Techniques
- Laser-induced spectroscopy and plasma
- Advanced Data Storage Technologies
- Advanced Battery Technologies Research
- Advancements in Battery Materials
- Ionosphere and magnetosphere dynamics
- Advanced Battery Materials and Technologies
- Plasma Applications and Diagnostics
- Particle accelerators and beam dynamics
- Cryptographic Implementations and Security
- Magnetic confinement fusion research
- Atomic and Molecular Physics
- Simulation and Modeling Applications
- E-commerce and Technology Innovations
- Advancements in Solid Oxide Fuel Cells
- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Gas Sensing Nanomaterials and Sensors
- Atomic and Subatomic Physics Research
- Heat Transfer and Optimization
- Spacecraft Design and Technology
- Astro and Planetary Science
- Electrochemical sensors and biosensors
Glenn Research Center
2014-2024
Minzu University of China
2014-2024
Tianjin University of Science and Technology
2024
Tri-Service General Hospital
2024
Tsinghua University
2020-2023
China Agricultural University
2020-2023
National Aeronautics and Space Administration
2012-2021
Guilin University of Aerospace Technology
2021
Dalian Polytechnic University
2020
PLA Army Engineering University
2018
Fire accidents involving electric vehicles can raise questions regarding the safety of lithium-ion batteries. This article aims to answer some common public concern battery issues in an easy-to-understand context. The addressed include (1) vehicle accidents, (2) safety, (3) existing technology, and (4) solid-state We discuss causes providing advice on countermeasures make safer systems. failure mechanisms batteries are also clarified, we hope this will promote a future for applications wider...
Abstract Li‐ion batteries (LIBs) that promise both safety and high energy density are critical for a new‐energy future. However, recent studies on battery thermal runaway (TR) suggest the higher is compressed in battery, accidents with fires explosions can occur more catastrophic way. This “trade‐off” between poses challenging obstacles toward future applications of developing high‐energy chemistries. Herein, most appealing (HE)‐LIB chemistries carefully reviewed. The TR characters HE‐LIBs,...
Faraday probes are a common plasma diagnostic used to determine the local ion charge flux of electric propulsion plumes. Standard practices, guidelines, and recommendations provided for experimental methods analysis techniques that aim standardize community mitigate test environment effects, reduce systematic measurement error in order improve plume predictions space environment. The approaches applicable time-averaged properties near-field far-field plumes, with emphasis on Hall effect...
The structure, thermal expansion coefficients and ionic conductivity of Ce1-xSmxO2-x/2 Ce1-xCaxO2-x (x = 0−0.30) solid electrolytes prepared hydrothermally in a relatively wide concentration range for the first time were systematically investigated. uniformly small particle size (40−68 nm) materials allows sintering samples into highly dense ceramic pellets at 1400 °C, significantly lower temperature, compared to that 1600 °C required by solid-state techniques. maximum was found x 0.17 Sm...
Thermal runaway (TR) and the thermal propagation (TRP) of Li-ion batteries can lead to safety incidents cause explosion or fire accidents. Therefore, TR is a critical issue for batteries. In this study, TRP behavior using different abuse methods (nail penetration, side heating, overcharge) was investigated experimentally. First, Extended Volume Accelerating Rate Calorimetry (EV-ARC) test performed cell with an internal implantation thermocouple comparative study. Three were used induce cells...
The NASA Hall Effect Rocket with Magnetic Shielding (HERMeS) 12.5 kW Technology Demonstration Unit-1 (TDU-1) thruster has been the subject of extensive technology maturation in preparation for development into a flight ready propulsion system. Part was to test TDU-1 several ground based electrical configurations assess robustness and suitability successful in-space operation. configuration testing recently demonstrated as an important step understanding assessing how may operate differently...
A test to characterize the effect of varying background pressure on NASA's 12.5-kW Hall Effect Rocket with Magnetic Shielding had being completed. This thruster is baseline propulsion system for Solar Electric Propulsion Technology Demonstration Mission (SEP TDM). Potential differences in performance and oscillation characteristics when ground facilities versus on-orbit are considered a primary risk Asteroid Redirect Robotic Mission, which candidate SEP TDM. The first objective this was...
NASA's Hall Effect Rocket with Magnetic Shielding (HERMeS) 12.5 kW Technology Demonstration Unit-1 (TDU-1) has been the subject of extensive technology maturation in preparation for flight system development. Part effort included experimental evaluation TDU-1 thruster conducting and dielectric front pole cover materials two different electrical configurations. A graphite magnetic configuration body electrically tied to cathode, an alumina floating were evaluated. Both configurations also...
Laser-induced fluorescence velocimetry measurements obtained from the interior of a 6-kW Hall thruster using Xe I 6s 3=2 02 ! 6p 2 transition at 823.4 nm (vacuum) and 6s0 1=2 01 6p0 834.9 are presented. The is operated under seven conditions, with discharge voltages ranging 150 to 600 V anode mass flow rates 10 30 mg=s. Velocimetry results along channel centerline show that neutral propellant leaves bulk axial velocity 100 m=s accelerates 300–400 by exit plane. temperature neutrals starts...
fabrication of the thruster, assembly test setup, and operation vacuum facility.
During a component compatibility test of the NASA HiVHAc Hall thruster, number plasma diagnostics were implemented to study effect varying facility background pressure on thruster operation.These characterized performance, plume, and oscillations in thruster.Thruster performance plume characteristics as functions previously published.This paper focuses changes oscillation with changing pressure.The used include high-speed camera set Langmuir probes.The results show rise frequency "breathing"...
Porous alumina microfibers were prepared, and used to construct a highly sensitive electrochemical sensor for quercetin.
During development testing of a 12.5 kW magnetically shielded Hall thruster, direct evidence counterstreaming ions eroding the pole covers was found. One stream appears to originate from discharge channel while other centrally mounted cathode. Velocity distribution measurement indicates that each impacts poles thruster at high oblique angles incidence. While average energy in tens eV, distributions contained high-energy tails can be major contributor erosion. Starting with physical picture...