Opaque bubble layer incidence in Femtosecond laser-assisted LASIK: comparison among different flap design parameters

Stern flaps have been used in many recent designs of transom stern vessels to provide increased top speed or to realize improvements in fuel economy over the operating range. The use of stern flaps has also become a practical retrofit on existing designs because significant improvements can be achieved at very minimal cost. Model test data from a limited series of stern flap designs for a group of combatant type vessels were utilized to develop a preliminary design model for stern flaps for these vessels. This model has been incorporated into Visual VB/Microsoft Excel-based software that will permit the investigation of the benefits of stern flaps in preliminary design. Within the limitations of the model, this software will also perform the multicriterion optimization needed to establish the initial parameters for a stern flap in preliminary design. This preliminary design can become the baseline design for use in a subsequent model test program. The software will then accept the results of tests of a systematic stern flap family developed about the baseline design and create a project-specific response surface model that can be used in subsequent detailed design. The software can then be utilized again to provide multicriterion optimization of this project-specific model to establish final design parameters for the stern flap.

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Essential opaque bubble layer elimination with novel LASIK flap settings in the FS200 Femtosecond Laser

Clinical Ophthalmology ◽

10.2147/opth.s43723 ◽

2013 ◽

pp. 765 ◽

Cited By ~ 7

Author(s):

John Kanellopoulos ◽

George Asimellis

Keyword(s):

Femtosecond Laser ◽

Bubble Layer

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Risk factors for opaque bubble layer in femtosecond-laser-assisted laser in situ keratomileusis (an Egyptian study)

Journal of the Egyptian Ophthalmological Society ◽

10.4103/ejos.ejos_24_20 ◽

2020 ◽

Vol 113 (3) ◽

pp. 91

Author(s):

MarwaA Karim ◽

AhmedS Abdel-Wanes ◽

AbelrahmanG Salman ◽

AzzaM.A Said ◽

BasemF.A Riad

Keyword(s):

Risk Factors ◽

Femtosecond Laser ◽

Laser In Situ Keratomileusis ◽

Bubble Layer

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OCT Study of the Femtosecond Laser Opaque Bubble Layer

Journal of Refractive Surgery ◽

10.3928/1081597x-20161027-01 ◽

2017 ◽

Vol 33 (1) ◽

pp. 18-22 ◽

Cited By ~ 3

Author(s):

Gustavo K. Marino ◽

Marcony R. Santhiago ◽

Steven E. Wilson

Keyword(s):

Femtosecond Laser ◽

Bubble Layer

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Design parameters for the acousto-optic programmable filter used in femtosecond laser pulse manipulation

Conference Digest. 2000 Conference on Lasers and Electro-Optics Europe (Cat. No.00TH8505) ◽

10.1109/cleoe.2000.909806 ◽

2002 ◽

Author(s):

F. Verluise ◽

V. Laude ◽

P. Tournois

Keyword(s):

Laser Pulse ◽

Femtosecond Laser ◽

Femtosecond Laser Pulse ◽

Design Parameters ◽

Programmable Filter

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Numerical Investigation of the Effect of Jet-Flaps in a Transonic Turbine Cascade With Subsonic Operating Conditions

Volume 8: Turbomachinery, Parts A, B, and C ◽

10.1115/gt2012-68062 ◽

2012 ◽

Author(s):

Ping-Ping Chen ◽

Wei-Yang Qiao ◽

Pu-Wei Wang

Keyword(s):

Mass Flow Rate ◽

Mass Flow ◽

Flow Rate ◽

Operating Conditions ◽

Slot Width ◽

Design Parameters ◽

Pressure Loss Coefficient ◽

Flap Design ◽

Variable Geometry Turbine ◽

Jet Blowing

The objective of this article is to analyze numerically the effect of jet-flap on transonic high-pressure turbine cascades, which is one of usable flow control methods for a variable-geometry turbine (VGT). This paper is mainly on the discussion of the effect of different jet-flap design parameters with subsonic operating conditions: jet mass flow rate, jet slot location, jet blowing direction and jet slot width. With two-dimensional steady simulations, the jet-flap changes the cascade turning, the passage throat velocity distribution and throat area effectively, which will then contribute to a different turbine performance. Using a Cm = 2% pressure side (PS) jet-flap with 1.025mm slot width and counter-axial (-x) jet blowing direction, the incoming mass flow rate is diminished by 16.7%, the turning angle augmented by 3.7 degrees, but with an extended total-pressure loss coefficient from 0.05 (no jets) to 0.09.

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