Experimental study of field emission from ultrasharp silicon, diamond, GaN, and tungsten tips in close proximity to the counter electrode

2018 ◽  
Vol 36 (6) ◽  
pp. 06JL03 ◽  
Author(s):  
Claudia Lenk ◽  
Steve Lenk ◽  
Mathias Holz ◽  
Elshad Guliyev ◽  
Martin Hofmann ◽  
...  
Keyword(s):  
Experimental Study ◽  
Field Emission ◽  
Counter Electrode ◽  
Close Proximity ◽  
And Tungsten

Simulation and experimental study on tungsten field emission cathode

1999 ◽  
Vol 429 (1-3) ◽  
pp. 299-303 ◽  
Author(s):  
Yoshiaki Tsunawaki ◽  
Yoshiko Tokura ◽  
Mitsuhiro Kusaba ◽  
Nobuhisa Ohigashi ◽  
Kunioki Mima ◽  
...  
Keyword(s):  
Experimental Study ◽  
Field Emission ◽  
Field Emission Cathode ◽  
Emission Cathode

Experimental Study of Liquid Slosh Dynamics in a Partially-Filled Tank

2009 ◽  
Vol 131 (7) ◽  
Author(s):  
Guorong Yan ◽  
Subhash Rakheja ◽  
Kamran Siddiqui
Keyword(s):  
Experimental Study ◽  
Resonant Frequency ◽  
Excitation Frequency ◽  
Longitudinal Mode ◽  
Longitudinal Force ◽  
Scale Model ◽  
Fill Volume ◽  
Pitch Moment ◽  
Close Proximity ◽  
Rigid Mass

This article reports on an experimental study conducted to investigate slosh forces and moments caused by fluid slosh within a partly-filled tank subjected to lateral and longitudinal excitations applied independently. The experiments were performed on a scale model cleanbore and a baffled tank with laterally placed single- and multiple-orifice baffles. The experiments were conducted for three different fill volumes and different types of excitations: continuous harmonic and single-cycle sinusoidal excitations of different amplitudes and discrete frequencies. The dynamic forces and moments caused by fluid slosh with the baffled and cleanbore tank configurations were measured for different fill volumes and excitations using three-axis dynamometers. It is shown that the resulting forces and moments comprise many spectral components that can be associated with the excitation, resonance, and vibration and beat frequencies. Modulation of excitation frequency with the resonant frequency was also evident for all fill conditions and tank configurations when the two were in close proximity. The results also showed that the peak amplifications of forces and moments occur in the vicinity of the resonant frequency. At higher frequencies, the peak magnitudes of the forces, however, reduced significantly to values lower than the inertial forces developed by an equivalent rigid mass. At a given excitation condition, the slosh force amplitude increased with a decrease in the fill volume. It was also observed that the presence of baffles has negligible effect on the lateral slosh force and the corresponding resonant frequency. However, it caused a significant increase in the longitudinal mode resonant frequency. The baffles greatly reduced the amplifications in longitudinal force and pitch moment under longitudinal acceleration excitations.

Experimental Study on Floatation of Scheelite Ore of Jiangxi

2013 ◽  
Vol 868 ◽  
pp. 429-432 ◽  
Author(s):  
Dan Dan Wu ◽  
Shu Ming Wen ◽  
Jing Yang ◽  
Jiu Shuai Deng ◽  
Jian Liu
Keyword(s):  
Experimental Study ◽  
Sodium Silicate ◽  
Sodium Carbonate ◽  
Lead Nitrate ◽  
High Quality ◽  
Flotation Process ◽  
And Tungsten

In this study, according to the characteristics of scheelite in run-of-mine, the scheelite was concentrated by adopting the full flotation process with sodium carbonate as regulator agent, sodium silicate as inhibitor for gangue minerals, lead nitrate as activator and ZL pharmacy as collector. 6.15% of the coarse scheelite concentration with tungsten recovery of 96.18% was obtained from the raw ores with grade of 0.86%. The concentration of rough tungsten by heating, by which the high-quality scheelite with tungsten of 62.31% and tungsten concentrate recovery of 93.53% was obtained.

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