Results 21 to 30 of about 8,352,956 (301)

Simulation and Optimization of CNTs Cold Cathode Emission Grid Structure

Nanomaterials, 2022
Carbon nanotubes (CNTs) show significant advantages in the development of cold cathode X-ray tubes due to their excellent field emission performance; however, there are still some problems, such as short lifetime and the low emission current of large ...
Yang Zhang, Xinchuan Liu, Liye Zhao, Yuanxun Li, Zhenjun Li   +4 more
doaj   +1 more source

Near-Field Analysis of Terahertz Pulse Generation From Photo-Excited Charge Density Gradients [PDF]

, 2015
Excitation of photo-current transients at semiconductor surfaces by subpicosecond optical pulses gives rise to emission of electromagnetic pulses of terahertz (THz) frequency radiation.
Natrella, M, Freeman, JR, Renaud, CC, Graham, CS, Linfield, EH, Moodie, DG, Cannard, PJ, Davies, AG, Mitrofanov, O, Seeds, AJ, Mueckstein, R, Hatem, O, Robertson, MJ   +12 more
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Characterization of Rape Field Microwave Emission and Implications to Surface Soil Moisture Retrievals [PDF]

, 2012
In the course of Soil Moisture and Ocean Salinity (SMOS) mission calibration and validation activities, a ground based L-band radiometer ELBARA II was situated at the test site Puch in Southern Germany in the Upper Danube Catchment.
Mauser, Wolfram, Marzahn, P., Florian Schlenz, Mauser, W., Schlenz, Florian, Joachim Fallmann, Fallmann, Joachim, Wolfram Mauser, Fallmann, J., Löw, Alexander, Philip Marzahn, Loew, A., Schlenz, F., Marzahn, Philip, Alexander Loew   +14 more
core   +1 more source

Carbon Nanotube Field Emitters Synthesized on Metal Alloy Substrate by PECVD for Customized Compact Field Emission Devices to Be Used in X-Ray Source Applications

Nanomaterials, 2018
In this study, a simple, efficient, and economical process is reported for the direct synthesis of carbon nanotube (CNT) field emitters on metal alloy. Given that CNT field emitters can be customized with ease for compact and cold field emission devices,
Sangjun Park, Amar Prasad Gupta, Seung Jun Yeo, Jaeik Jung, Sang Hyun Paik, Mallory Mativenga, Seung Hoon Kim, Ji Hoon Shin, Jeung Sun Ahn, Jehwang Ryu   +9 more
doaj   +1 more source

Field Emission from Carbon Nanostructures

Applied Sciences, 2018
Field emission electron sources in vacuum electronics are largely considered to achieve faster response, higher efficiency and lower energy consumption in comparison with conventional thermionic emitters.
Filippo Giubileo, Antonio Di Bartolomeo, Laura Iemmo, Giuseppe Luongo, Francesca Urban   +4 more
doaj   +1 more source

Research progress in carbon nitride in field emission cold cathode materials

Cailiao gongcheng, 2022
Carbon nitride has the advantages of excellent thermal stability, high thermal conductivity, larger forbidden band width and negative electron affinity. Therefore, carbon nitride is a promising field emission cathode material. On the basis of introducing
XIAO Haochun, FENG Yibing, WANG Jigang
doaj   +1 more source

Fabrication and Simulation of Self-Focusing Field Emission X-ray Tubes

Applied Sciences, 2015
A self-focusing field emission (FE) X-ray tube with a large-area cathode design was simulated and fabricated. The designed X-ray tube had a cylindrically symmetric geometry; the diameter of the cathode and the anode was 15 mm, and the cathode-anode ...
Kevin Cheng, Yi-Ping Chou, Meng-Jey Youh, Yih-Ming Liu, Ming-Der Ger, Kung-Hsu Hou, Nen-Wen Pu   +6 more
doaj   +1 more source

The effect of the enhanced field emission on the characteristics of the superconducting radio frequency cavities [PDF]

Nuclear Technology and Radiation Protection, 2018
Electron field emission limiting the accelerating gradient in superconducting cavities remains the dominant setback in cavity production. The need to understand and control the field emission has become increasingly important because of the prospect of ...
Radmilović-Rađenović Marija D., Beličev Petar D., Rađenović Branislav M.   +2 more
doaj   +1 more source

Cold Cathodes with Two-Dimensional van der Waals Materials

Nanomaterials, 2023
Two-dimensional van der Waals materials could be used as electron emitters alone or stacked in a heterostructure. Many significant phenomena of two-dimensional van der Waals field emitters have been observed and predicted since the landmark discovery of ...
Yicong Chen, Jun Chen, Zhibing Li
doaj   +1 more source

Structure Optimization of Planar Nanoscale Vacuum Channel Transistor

Micromachines, 2023
Due to its unique structure, discoveries in nanoscale vacuum channel transistors (NVCTs) have demonstrated novel vacuum nanoelectronics. In this paper, the structural parameters of planar-type NVCTs were simulated, which illustrated the influence of ...
Ji Xu, Congyuan Lin, Yu Li, Xueliang Zhao, Yongjiao Shi, Xiaobing Zhang   +5 more
doaj   +1 more source