Results 11 to 20 of about 6,836 (265)
Materials Research, 2021 Plasma nitriding is a plasma-activated thermochemical method widely used to increase the fatigue strength, hardness and wear resistance of low-alloy steels.
F.S. Zhao +9 more
doaj +1 more source
Improved Field Emission Properties of Carbon Nanostructures by Laser Surface Engineering
Nanomaterials, 2020 We herein present an alternative geometry of nanostructured carbon cathode capable of obtaining a low turn-on field, and both stable and high current densities.
Minh Nhat Dang +5 more
doaj +1 more source
Review of Scientific Instruments, 1997 The generation of an electron beam by a hollow cathode gun in a cusp magnetic field is discussed. Such a gun is proposed for an electron cooling device without toroids. In a section with a homogeneous magnetic field, this beam experiences a disturbance region near the axis where the electron temperature becomes higher.
CIULLO, Giuseppe +3 more
openaire +3 more sources
Materials & Design, 2021 Lithium-sulfur (Li-S) batteries are deemed as the attractive systems for high-energy storage. However, the polysulfides shuttling with slow redox kinetics has seriously hindered their practical applications. Herein, sulfur-deficient zinc sulfide (ZnS1−x)
Wanjie Gao +5 more
doaj +1 more source
AIP Advances, 2019 We investigated the application of a less hydrogen-dilute and low gas pressure hollow-anode plasma to fast chemical-vapor deposition of photosensitive hydrogenated microcrystalline silicon (μc-Si:H).
Toshihiro Tabuchi +3 more
doaj +1 more source
Triple Langmuir Probes Measurements of LaB6 Hollow Cathodes Plume
Frontiers in Physics, 2019 Lanthanum hexaboride hollow cathodes represent a viable option for high power Hall effect thruster applications, under development for the next generation of manned and robotic interplanetary missions.
Giulia Becatti +4 more
doaj +1 more source
SITAEL HC1 Low-Current Hollow Cathode
Aerospace, 2020 SITAEL is active in the field of electric propulsion and is involved in the development of different thruster technologies—mainly Hall thrusters (HTs)—of power levels ranging from 100 W up to 20 kW.
Daniela Pedrini +4 more
doaj +1 more source
Emission characteristics of laser ablation-hollow cathode glow discharge spectral source
Open Chemistry, 2014 The emission characteristics of a scheme combining laser ablation as sample introduction source and hollow cathode discharge as excitation source are presented.
Karatodorov Stefan +2 more
doaj +1 more source
Barium Depletion in Hollow Cathode Emitters [PDF]
45th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit, 2009 Dispenser hollow cathodes rely on a consumable supply of Ba released by BaO-CaO-Al2O3 source material in the pores of a tungsten matrix to maintain a low work function surface. The examination of cathode emitters from long duration tests shows deposits of tungsten at the downstream end that appear to block the flow of Ba from the interior. In addition,
James E. Polk +3 more
openaire +2 more sources
Aerospace, 2021 LaB6 emitters are commonly used in hollow cathodes that are utilized in electric space propulsion systems. In order to obtain necessary surface current emission densities of 1–10 A/cm2 for cathode operations, LaB6 emitters require temperatures above 1500
Ugur Kokal, Nazli Turan, Murat Celik
doaj +1 more source