Limiting Current Densities in Electron Beams

1939 ◽  
Vol 10 (10) ◽  
pp. 715-724 ◽  
Author(s):  
J. R. Pierce
Keyword(s):  
Electron Beams ◽  
Limiting Current ◽  
Current Densities

Compact and efficient gas diffusion electrodes based on nanoporous alumina membranes for microfuel cells and gas sensors

The Analyst ◽  
2020 ◽  
Vol 145 (1) ◽  
pp. 122-131 ◽  
Author(s):  
Wanda V. Fernandez ◽  
Rocío T. Tosello ◽  
José L. Fernández
Keyword(s):  
Response Times ◽  
Hydrogen Oxidation ◽  
Fast Response ◽  
Gas Diffusion ◽  
Limiting Current ◽  
Gas Diffusion Electrodes ◽  
Nanoporous Alumina ◽  
Alumina Membranes ◽  
Current Densities ◽  
Microfuel Cells

Gas diffusion electrodes based on nanoporous alumina membranes electrocatalyze hydrogen oxidation at high diffusion-limiting current densities with fast response times.

scholarly journals An Investigation of Direct Hydrocarbon (Propane) Fuel Cell Performance Using Mathematical Modeling

2018 ◽  
Vol 2018 ◽  
pp. 1-18
Author(s):  
Bhavana Parackal ◽  
Hamidreza Khakdaman ◽  
Yves Bourgault ◽  
Marten Ternan
Keyword(s):  
Fuel Cells ◽  
Current Density ◽  
Reaction Rate ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Polarization Curves ◽  
Limiting Current ◽  
Fuel Cell Performance ◽  
Limiting Current Density ◽  
Current Densities

An improved mathematical model was used to extend polarization curves for direct propane fuel cells (DPFCs) to larger current densities than could be obtained with any of the previous models. DPFC performance was then evaluated using eleven different variables. The variables related to transport phenomena had little effect on DPFC polarization curves. The variables that had the greatest influence on DPFC polarization curves were all related to reaction rate phenomena. Reaction rate phenomena were dominant over the entire DPFC polarization curve up to 100 mA/cm2, which is a value that approaches the limiting current densities of DPFCs. Previously it was known that DPFCs are much different than hydrogen proton exchange membrane fuel cells (PEMFCs). This is the first work to show the reason for that difference. Reaction rate phenomena are dominant in DPFCs up to the limiting current density. In contrast the dominant phenomenon in hydrogen PEMFCs changes from reaction rate phenomena to proton migration through the electrolyte and to gas diffusion at the cathode as the current density increases up to the limiting current density.

Calculation of limiting current of relativistic electron beams

1981 ◽  
Vol 21 (4) ◽  
pp. 440-444 ◽  
Author(s):  
V. I. Kucherov ◽  
P. B. Rutkevich ◽  
V. V. Chernyi
Keyword(s):  
Relativistic Electron ◽  
Electron Beams ◽  
Limiting Current ◽  
Relativistic Electron Beams

Limiting current of intense electron beams in a decelerating gap

2016 ◽  
Vol 23 (2) ◽  
pp. 023114 ◽  
Author(s):  
G. S. Nusinovich ◽  
B. L. Beaudoin ◽  
C. Thompson ◽  
J. A. Karakkad ◽  
T. M. Antonsen
Keyword(s):  
Electron Beams ◽  
Limiting Current ◽  
Intense Electron Beams ◽  
Intense Electron

Microwave generation by a superluminal source at limiting current densities

2003 ◽  
Vol 29 (6) ◽  
pp. 491-502 ◽  
Author(s):  
Yu. N. Lazarev ◽  
P. V. Petrov ◽  
Yu. G. Syrtsova
Keyword(s):  
Limiting Current ◽  
Microwave Generation ◽  
Current Densities
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