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Showing 1 to 13 of 13 for “"cold cathode"”.
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Design and applications of cold-cathode X-ray imaging systems
… x-ray tubes - specifically, a thermionic cathode - is reliable and capable of high current. However, thermionic cathodes are bulky, and cannot be pulsed quickly. Non-thermionic ('cold-cathode') electron generation can be exploited to make a smaller and rapidly pulsable x-ray source. Such …
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Non-metallic cold-cathode electron emission from composite metal-insulator microstructures
… dielectric-coated and composite-coated metallic cathodes. An optical imaging technique has been used to observe and characterize the spatial and temporal behaviour of the populations of emission sites on these cathodes under various experimental conditions, e.g. pulsed-fields, gas environment …
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Control of sexual maturation and growth in Atlantic cod (Gadus morhua) by use of cold cathode light technology
… the year. The present work tests the effect of a Cold Cathode Light system (CCL). The spectral composition of the CCL light penetrates water well and matches the light perception of the cod. The cod were exposed to continuous light from the lamps in cages for two years, while a control group was …
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White light emitting diode as liquid crystal display backlight
… would be using white LED to replace the current Cold Cathode Fluorescent Light (CCFL) technology as the backlight of the large screen Liquid Crystal Display (LCD) screen due to the fact that LCD is a rapidly booming market.
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Radio frequency driven direct current electron beam source
… ion-induced secondary electron emission from cold cathodes is developed for feature charge neutralization during plasma etching. A low pressure (approximately 2 – 20 mTorr) inductively coupled plasma provides ions which impinge on a high secondary electron emission coefficient anodized …
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Development of a duoplasmatron ion source at the Ithemba laboratory for accelerator based science (ithemba labs)
A cold hollow cathode duoplasmatron ion source has been designed, built, optimized and evaluated for use as an external stand-by ion source for the second injector cyclotron (SPC2) during those times that the light-ion injector cyclotron (SPCl) is out of operation and not available for …
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Pulsed mm-Wave electron cyclotron maser experiments
… produced from a field-immersed, field-emission, cold cathode. A shaped anode cavity was designed for the optimum cavity Q, resonant frequencies, relative mode density, reflection coefficients and mode conversion in the output coupler. Two pulsed conventional field coils were used; coil#1 (maximum …
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Investigation of the interaction of high current relativistic electron beams with electromagnetic fields
… by explosive electron eMission from the flare cathode plasma of a high voltage, cold-cathode, field-emission diode are reported. In addition, the production of high power ( ~100kW) microwave radiation through the interaction of such beams with the natural modes of a resonant cavity is reported. …
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Design, Fabrication, and Characterization of Carbon Nanotube Field Emission Devices for Advanced Applications
… candidates for electron field emission (FE) cathodes in integrated FE devices. These nanostructured carbon materials possess exceptional properties and their synthesis can be thoroughly controlled. Their integration into advanced electronic devices, including not only FE cathodes, but …
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Extrusion Printing of Carbon Nanotube Inks, from Rheology to Electronics
… CNT concentrations around 15% to print arrays of cold cathode field electron emitters with freestanding miniature conical shapes having sub-100-micrometer tip diameters onto addressable gridpoints of a PCB. By modifying the ink further to increase extensional viscosity, individual …
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Development of image analysis techniques to assist evaluation of both air void structure and aggregate shape factors in concrete
… the crosshead so as to align directly above the cold cathode fluorescent (CCF) light source and the scanning charged coupled cross-head image recording device. A method of assessing the amount of voidage found within the curved surface of concrete core samples has been developed. A freely …
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Development of a ferroelectric plasma source through material degradation studies and characterization of volume and surface discharges
… is used to indentify materials ejected from the cathode in real time. The RGA independently confirms oxygen loss even when there is no optical emission. The cathode material in this work was found to be able to produce emission current densities on the order of 1 – 10 A/cm^2. Experiments explored …