scholarly journals Remote triggering of air-gap discharge by a femtosecond laser filament and postfilament at distances up to 80 m

2021 ◽  
Vol 119 (4) ◽  
pp. 041103
Author(s):  
O. G. Kosareva ◽  
D. V. Mokrousova ◽  
N. A. Panov ◽  
I. A. Nikolaeva ◽  
D. E. Shipilo ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Air Gap ◽  
Remote Triggering

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

Femtosecond laser assisted penetrating keratoplasty

2006 ◽  
Vol 223 (S 1) ◽  
Author(s):  
MP Holzer ◽  
TM Rabsilber ◽  
GU Auffarth
Keyword(s):  
Femtosecond Laser ◽  
Penetrating Keratoplasty

A novel analytical calculation of magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping

2020 ◽  
pp. 1-15
Author(s):  
Jianqi Li ◽  
Yu Zhou ◽  
Jianying Li
Keyword(s):  
Magnetic Field ◽  
Conformal Mapping ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Electromotive Force ◽  
Analytical Calculation ◽  
Air Gap ◽  
Permanent Magnet Machines ◽  
Peak Value

This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher peak value of cogging torque.

Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

2020 ◽  
Vol 64 (1-4) ◽  
pp. 969-975
Author(s):  
Hiroaki Kikuchi ◽  
Yuki Sato
Keyword(s):  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Effective Permeability ◽  
Magnetic Circuit ◽  
Magnetic Measurement ◽  
Air Gap ◽  
Motive Force ◽  
Hysteresis Curve ◽  
Evaluation Technique ◽  
Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

Design and Analysis of Air Gap Microstrip Slot Antenna Using Aperture Coupling

2012 ◽  
Vol 2 (4) ◽  
pp. 104-106
Author(s):  
J. P. Ganji J. P. Ganji ◽  
◽  
M.C.Sahoo M.C.Sahoo ◽  
J.M.Rathod J.M.Rathod
Keyword(s):  
Air Gap ◽  
Slot Antenna ◽  
Aperture Coupling

Influence of Trap States on the Kinetics of Luminescence and Induced Light Absorption by Si Nanoparticles in a SiO2 Matrix at Their Excitation with Femtosecond Laser Pulses

2013 ◽  
Vol 58 (1) ◽  
pp. 20-25
Author(s):  
V.M. Kadan ◽  
◽  
I.Z. Indutnyi ◽  
V.A. Dan’ko ◽  
P.E. Shepelyavyi ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Light Absorption ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Trap States ◽  
Sio2 Matrix ◽  
Si Nanoparticles ◽  
Kinetics Of

Effect of Periodic Nanostructures Produced with Femtosecond Laser for Wavelength of 388 and 775 nm on Cell Spreading

2015 ◽  
Vol 135 (10) ◽  
pp. 587-591
Author(s):  
Togo Shinonaga ◽  
Masahiro Tsukamoto ◽  
Peng Chen ◽  
Takao Hanawa
Keyword(s):  
Femtosecond Laser ◽  
Cell Spreading ◽  
Periodic Nanostructures

Development of the Partial Discharge Inception Calculation Model in a Non-uniform Air Gap Considering the Effect of Humidity

2011 ◽  
Vol 131 (12) ◽  
pp. 1017-1023 ◽  
Author(s):  
Norihito Yanagita ◽  
Tatsuro Kato ◽  
Toshiaki Rokunohe ◽  
Takeshi Iwata ◽  
Hiroki Kojima ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Calculation Model ◽  
Air Gap

Proposal of Pancake Axial-Air-Gap-Type Self-Excited Wound-Field Synchronous Motor Utilizing Double-Sided Space Harmonics

2015 ◽  
Vol 135 (5) ◽  
pp. 582-583 ◽  
Author(s):  
Masahiro Aoyama ◽  
Toshihiko Noguchi
Keyword(s):  
Synchronous Motor ◽  
Air Gap ◽  
Space Harmonics

Design of the Air Gap Distribution of an Inductor for Automobiles with CI-Type Core

2016 ◽  
Vol 136 (11) ◽  
pp. 901-906
Author(s):  
Akinari Yamashita ◽  
Mamiko Inamori ◽  
Masayuki Morimoto
Keyword(s):  
Air Gap
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