scholarly journals LOW-POWER FAR FIELD NANONEWTON OPTICAL FORCE TRAPPING BASED ON FAR-FIELD NANOFOCUSING PLASMONIC LENS

2016 ◽  
Vol 47 ◽  
pp. 37-44
Author(s):  
Pengfei Cao ◽  
Lin Cheng
Keyword(s):  
Low Power ◽  
Optical Force ◽  
Far Field ◽  
Plasmonic Lens

Focus Modulation of Nanopinholes-Based Plasmonic Lens for Far-Field Imaging

2011 ◽  
Vol 8 (7) ◽  
pp. 1220-1225
Author(s):  
Zhihui Ke ◽  
Xiuli Zhou ◽  
Yongqi Fu ◽  
Lingjie Yi
Keyword(s):  
Far Field ◽  
Plasmonic Lens ◽  
Field Imaging

Tiny impacts for far-field focusing by plasmonic lens with a free slit-width design

2017 ◽  
Vol 56 (11) ◽  
pp. 1 ◽  
Author(s):  
Tingzhao Fu ◽  
Shaohui Cui ◽  
Huan Wang ◽  
Yang Xia ◽  
Chaobo Li
Keyword(s):  
Slit Width ◽  
Far Field ◽  
Plasmonic Lens

scholarly journals Numerical Prediction of Far-Field Combustion Noise from Aeronautical Engines

Acoustics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 174-198 ◽  
Author(s):  
Mélissa Férand ◽  
Thomas Livebardon ◽  
Stéphane Moreau ◽  
Marlène Sanjosé
Keyword(s):  
Temperature Field ◽  
Low Power ◽  
Combustion Chamber ◽  
High Power ◽  
Acoustic Propagation ◽  
Combustion Noise ◽  
Far Field ◽  
Low Frequencies ◽  
Turboshaft Engine ◽  
Good Agreement

A hybrid methodology combining a detailed Large Eddy Simulation of a combustion chamber sector, an analytical propagation model of the extracted acoustic and entropy waves at the combustor exit through the turbine stages, and a far-field acoustic propagation through a variable exhaust temperature field was shown to predict far-field combustion noise from helicopter and aircraft propulsion systems accurately for the first time. For the single-stream turboshaft engine, the validation was achieved from engine core to the turbine exit. Propagation to the far field was then performed through a modeled axisymmetric jet. Its temperature modified the acoustic propagation of combustion noise significantly and a simple analytical model based on the Snell–Descarte law was shown to predict the directivity for axisymmetric single jet exhaust accurately. Good agreement with measured far-field spectra for all turboshaft-engine regimes below 2 kHz stresses that combustion noise is most likely the dominant noise source at low frequencies in such engines. For the more complex dual-stream turbofan engine, two regime computations showed that direct noise is mostly generated by the unsteady flame dynamics and the indirect combustion noise by the temperature stratification induced by the dilution holes in the combustion chamber, as found previously in the turboshaft case. However, in the turboengine, direct noise was found dominant at the combustor exit for the low power case and equivalent contributions of both combustion noise sources for the high power case. The propagation to the far-field was achieved through the temperature field provided by a Reynolds-Averaged Navier–Stokes simulation. Good agreement with measured spectra was also found at low frequencies for the low power turboengine case. At high power, however, turboengine jet noise overcomes combustion noise at low frequencies.

scholarly journals Low-Power Far-Field Wireless Powering for Wireless Sensors

2013 ◽  
Vol 101 (6) ◽  
pp. 1397-1409 ◽  
Author(s):  
Zoya Popovic ◽  
Erez Avigdor Falkenstein ◽  
Daniel Costinett ◽  
Regan Zane
Keyword(s):  
Low Power ◽  
Wireless Sensors ◽  
Far Field ◽  
Wireless Powering

Doubly-Charged Xe Ions Evidenced by Time Resolved RPA Measurement in the Far Field Plume of a Low-Power HET

2015 ◽  
Vol 55 (7) ◽  
pp. 529-537 ◽  
Author(s):  
T. Gibert ◽  
L. Balika ◽  
F. Diop ◽  
A. Bouchoule
Keyword(s):  
Low Power ◽  
Far Field ◽  
Time Resolved ◽  
Doubly Charged
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