Distributions of prebreakdown emission sites on broad area rounded shaped copper cathode of a vacuum gap

2002 ◽  
Author(s):  
S. Kobayashi ◽  
N.S. Xu ◽  
Y. Saito ◽  
R.V. Latham
Keyword(s):  
Copper Cathode ◽  
Broad Area ◽  
Vacuum Gap

An analysis of field-induced hot-electron emission from metal-insulator microstructures on broad-area high-voltage electrodes

1986 ◽  
Vol 403 (1825) ◽  
pp. 285-311 ◽  
Keyword(s):  
Electron Emission ◽  
Voltage Characteristic ◽  
Spectral Shape ◽  
Hot Electron ◽  
Current Voltage Characteristic ◽  
Broad Area ◽  
Metal Insulator ◽  
Resolution Electron ◽  
Current Voltage ◽  
Vacuum Gap

High-resolution electron energy distribution measurements of individual microscopic sites have been used to develop a detailed theoretical model of the field-induced hot-electron emission mechanism responsible for pre-breakdown currents at vacuum-gap fields of 10-30 MV m -1 . The model, which is based on the formation of conducting channels in a metal-insulator-vacuum (m. i. v.) micro-emission régime, has provided experimentally verified quantitative relations for the current-voltage characteristic, spectral shape, and the field-dependence of the spectral full width at half maximum (f. w. h. m.) and shift.

Influence of aging effect on behavior of field emission sites in a broad-area vacuum gap

2001 ◽  
Vol 136 (3) ◽  
pp. 10-18 ◽  
Author(s):  
Eiji Takahashi ◽  
Akinori Ebe ◽  
Kiyoshi Ogata ◽  
Shigehiro Komuro ◽  
Hideo Mitsui ◽  
...  
Keyword(s):  
Field Emission ◽  
Aging Effect ◽  
Broad Area ◽  
Vacuum Gap

scholarly journals Influences of aging effect on the behavior of field emission site in broad area vacuum gap

2000 ◽  
Vol 120 (5) ◽  
pp. 560-567
Author(s):  
Eiji Takahashi ◽  
Akinori Ebe ◽  
Kiyoshi Ogata ◽  
Shigehiro Komuro ◽  
Mototaka Sone ◽  
...  
Keyword(s):  
Field Emission ◽  
Aging Effect ◽  
Broad Area ◽  
Vacuum Gap

3.0 W blue light generation by frequency doubling of broad area semiconductor amplifier emission

1993 ◽  
Vol 29 (1) ◽  
pp. 77-78 ◽  
Author(s):  
L.E. Busse ◽  
L. Goldberg ◽  
D. Mehuys ◽  
G. Mizell
Keyword(s):  
Blue Light ◽  
Frequency Doubling ◽  
Broad Area ◽  
Light Generation

scholarly journals Fundamental limitations of the mode temperature concept in strongly coupled systems

2020 ◽  
Vol 75 (8) ◽  
pp. 803-807
Author(s):  
Svend-Age Biehs ◽  
Achim Kittel ◽  
Philippe Ben-Abdallah
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Strong Coupling ◽  
Quantum Systems ◽  
Coupled Systems ◽  
Strong Coupling Limit ◽  
Strongly Coupled ◽  
Fundamental Limitations ◽  
Temperature Concept ◽  
Vacuum Gap

AbstractWe theoretically analyze heat exchange between two quantum systems in interaction with external thermostats. We show that in the strong coupling limit the widely used concept of mode temperatures loses its thermodynamic foundation and therefore cannot be employed to make a valid statement on cooling and heating in such systems; instead, the incorrectly applied concept may result in a severe misinterpretation of the underlying physics. We illustrate these general conclusions by discussing recent experimental results reported on the nanoscale heat transfer through quantum fluctuations between two nanomechanical membranes separated by a vacuum gap.

scholarly journals Development of a Colorimetric Sensor for Autonomous, Networked, Real-Time Application

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5857
Author(s):  
Brandy J. Johnson ◽  
Anthony P. Malanoski ◽  
Jeffrey S. Erickson
Keyword(s):  
Real Time ◽  
Field Trials ◽  
Wireless Sensor ◽  
Broad Area ◽  
Ongoing Effort ◽  
Environmental Air ◽  
Further Development ◽  
Real Time Application ◽  
Selection Of ◽  
Event Occurrence

This review describes an ongoing effort intended to develop wireless sensor networks for real-time monitoring of airborne targets across a broad area. The goal is to apply the spectrophotometric characteristics of porphyrins and metalloporphyrins in a colorimetric array for detection and discrimination of changes in the chemical composition of environmental air samples. The work includes hardware, software, and firmware design as well as development of algorithms for identification of event occurrence and discrimination of targets. Here, we describe the prototype devices and algorithms related to this effort as well as work directed at selection of indicator arrays for use with the system. Finally, we review the field trials completed with the prototype devices and discuss the outlook for further development.

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