Results 21 to 30 of about 221,879 (297)
Development of Type 73 GH Equal Hole Perforating Charge
Cejing jishu, 2023 In order to solve the problem of the perforation gun not being centered in the casing due to the gravity of the perforation gun during unconventional horizontal well perforation operations in oil and gas reservoirs, and the uneven perforation of the ...
SUN Chengliang +5 more
doaj +1 more source
Enhanced transmission through a subwavelength aperture using metamaterials [PDF]
, 2009 We report an enhanced transmission through a single circular subwavelength aperture that is incorporated with a split ring resonator (SRR) at the microwave regime.
Aydin, Koray +6 more
core +1 more source
Applied Sciences, 2019 Focusing condition such as numerical aperture (N.A.) has a great influence on the creation of molten area and the stable welding process in fusion micro-welding of glass.
Zhiyong Ouyang +4 more
doaj +1 more source
Results in Physics, 2018 A novel design of circular hybrid photonic crystal fiber (CH-PCF) with highly nonlinearity and high numerical aperture (NA) is introduced in this paper.
Bikash Kumar Paul +3 more
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COMPARISON OF HOGHORN ANALYSIS METHODS
Perner’s Contacts, 2020 The paper compares an aperture method and full-wave numerical simulations of hoghorn, which is used as a simple primary feed for reflector antennas or individually without reflector.
Vladimir Schejbal +3 more
doaj +1 more source
Numerically focused optical coherence microscopy with structured illumination aperture [PDF]
Компьютерная оптика, 2018 In optical coherence microscopy (OCM) with a given numerical aperture (NA) of the objectives the transverse resolution can be increased by increasing the numerical aperture of illumination (NAi).
Anton Grebenyuk, Vladimir Ryabukho
doaj +1 more source
Phase-Controlled Planar Metalenses for High-Resolution Terahertz Focusing
Photonics, 2021 We experimentally demonstrate that high-resolution terahertz focusing can be realized in planar metalenses, which consist of arrays of different V-shaped antenna units on a silicon substrate.
Xin Yu +5 more
doaj +1 more source
Variable numerical-aperture temporal-coherence measurement of resonant-cavity LEDs [PDF]
, 2003 The first interferometric measurements of temporal-coherence length variation with numerical aperture (NA) are described for 650 nm, resonant-cavity light-emitting diodes (LEDs) agreeing with spectrally derived results.
Coutinho, RC +6 more
core +1 more source
High numerical aperture holographic microscopy reconstruction with extended z range [PDF]
, 2015 An holographic microscopy reconstruction method compatible with high numerical aperture microscope objective (MO) up to NA=1.4 is proposed. After off axis and reference field curvature corrections, and after selection of the +1 grating order holographic ...
Donnarumma, Dario +3 more
core +4 more sources
Tight focal spots using azimuthally polarised light from a Fresnel cone [PDF]
, 2020 When focusing a light beam at high numerical aperture, the resulting electric field profile in the focal plane depends on the transverse polarisation profile, as interference between different parts of the beam needs to be taken into account.
Franke-Arnold, S. +3 more
core +2 more sources