Results 21 to 30 of about 324 (262)

Neural Network based Fault Tolerant LQR Control for Orbital Maneuvering in LEO Satellites using Hall Effect Thrusters [PDF]

AUT Journal of Modeling and Simulation, 2023
This paper develops a neural network-based fault tolerant LQR control for orbital maneuvering of satellites in low altitude orbit that are subjected to disturbances like earth gravity, atmospheric drag, third body, and solar radiation.
Elham Jahanbazi, Fatemeh Jahangiri, Mohammad Reza Mohammadi   +2 more
doaj   +1 more source

A review of Hall thruster plume modeling [PDF]

38th Aerospace Sciences Meeting and Exhibit, 2000
Hall thrusters are an attractive form of electric propulsion that are being developed to replace chemical systems for many orbit propulsion tasks on communications satellites. A concern in the use of these devices is the possible damage their plumes may cause to the host spacecraft.
openaire   +1 more source

An Analysis of the Effect of Hall Thruster Plumes on Surface Charging of a Complex Spacecraft Structure

Applied Sciences
This article aims to conduct an in-depth investigation into the environmental impact of Hall thruster plumes on spacecraft surface charging. The non-uniform plasma plume generated by Hall thrusters may trigger charging and discharging effects, making the
Xin Zhang, Wenjing Wang, Chaopin Bai, Yueqiang Sun, Shichen Jiang, Zhihao Yang, Qiang Chen, Lichang Zhang, Liguo Zhang, Zhiliang Zhang, Ziting Wang, Shuai Zhang   +11 more
doaj   +1 more source

Study on the influence of discharge voltage on the performance of Hall propulsion system

AIP Advances, 2023
The discharge characteristics of the Hall thruster are numerically studied at different discharge voltages when the magnetic field does not change based on the particle in cell plus Monte Carlo collision methods.
Yusong Zheng, Wanting Zhang, Mengdie Li, Zhixin Li, Youmei Wang   +4 more
doaj   +1 more source

Optimization of Cylindrical Hall Thrusters [PDF]

43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2007
The cylindrical Hall thruster features high ionization efficiency, quiet operation, and ion acceleration in a large volume-to-surface ratio channel with performance comparable with the state-of-the-art annular Hall thrusters. These characteristics were demonstrated in low and medium power ranges.
Yevgeny Raitses, Artem Smirnov, Erik Granstedt, Nathaniel J. Fi   +3 more
openaire   +1 more source

Artery‐on‐Chip Demonstrates Mechanical and Functional Features of Healthy and Diseased Living Smooth Muscle Tissue

Advanced Functional Materials, EarlyView.
This article details the development of an artery‐on‐chip platform for in vitro arterial disease modeling and therapeutic discovery. It describes the fabrication of a fibrin biomaterial scaffold seeded with iPSC‐derived smooth muscle and endothelial cells, mimicking native artery properties. Two genetic disease models showcase the platform's ability to
Danielle Yarbrough, Roy Chen, Katerina Katsouleas, Jaron Shoemaker, Travis Brady, Tianfang Yu, Jennifer Arthur Ataam, Connor Amelung, Lakshmi Santhanam, Ioannis Karakikes, Sharon Gerecht   +10 more
wiley   +1 more source

Robust Model Predictive Control for Satellite Orbit Maintenance Using Hall Effect Thrusters [PDF]

فناوری در مهندسی هوافضا
In this article, a robust model predictive controller is designed for maintaining the satellite's low earth orbit in the presence of perturbations and uncertainties.
Masumeh kiantaj, Morteza Farhid, Moharram Shameli   +2 more
doaj   +1 more source

PIC-DSMC Simulation of a Hall Thruster Plume with Charge Exchange Effects Using pdFOAM

Aerospace, 2023
To develop technologies for the stable operation of electric propulsion systems, the effects of charge exchange (CEX) on the exhaust plume of a Hall thruster were studied using the particle-in-cell direct simulation Monte Carlo (PIC-DSMC) method. For the
Sang Hun Kang
doaj   +1 more source

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

Advanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades, Pedro Hidalgo, David Maestre, Ruth Martínez‐Casado, Emilio Nogales, Beatriz Rodríguez, G. Cristian Vásquez, Bianchi Méndez   +7 more
wiley   +1 more source

Progress in Experimental Study of Plume Plasma Discharge Characteristics of the Hollow Cathode

气体物理
With the continuous maturation and sustained application of electric propulsion technology, electric propulsion is becoming the preferred choice of space propulsion for deep space exploration missions with its high specific impulse advantage. Among them,
Jintao JIA, Long MIAO, Yugan LIAO
doaj   +1 more source