Picosecond spectroscopic measurement of a solvent dependent change of rotational diffusion rotor shape

1987 ◽  
Vol 87 (12) ◽  
pp. 6802-6808 ◽  
Author(s):  
G. J. Blanchard
Keyword(s):  
Rotational Diffusion ◽  
Spectroscopic Measurement ◽  
Dependent Change ◽  
Rotor Shape

scholarly journals Patterned Photoalignment in Thin Films: Physics and Applications

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 84
Author(s):  
Vladimir Chigrinov ◽  
Aleksey Kudreyko ◽  
Qi Guo
Keyword(s):  
Liquid Crystals ◽  
Azo Dye ◽  
Rotational Diffusion ◽  
Incident Light ◽  
Polarized Light ◽  
Photonic Devices ◽  
Dye Molecules ◽  
Ferroelectric Liquid Crystals ◽  
Dependent Change ◽  
Alignment Process

Photoalignment of liquid crystals by using azo dye molecules is a commonly proposed alternative to traditional rubbing alignment methods. Photoalignment mechanism can be well described in terms of rotational diffusion of azo dye molecules exposed by ultraviolet polarized light. A specific feature of the irradiated light is the intensity dependent change of azimuthal anchoring of liquid crystals. While there are various mechanisms of azo dye photoalignment, photo-reorientation occurs when dye molecules orient themselves perpendicular to the polarization of incident light. In this review, we describe both recent achievements in applications of photoaligned liquid crystal cells and its simulation. A variety of display and photonic devices with azo dye aligned nematic and ferroelectric liquid crystals are presented: q-plates, optically rewritable flexible e-paper (monochromatic and color), and Dammann gratings. Some theoretical aspects of the alignment process and display simulation are also considered.

Spectroscopic Measurement of Air Plasma Flow Generated by 10kW Class ICP Heater

2019 ◽  
Vol 67 (2) ◽  
pp. 42-48
Author(s):  
Mayuko Tanaka ◽  
Kazuhiko Yamada ◽  
Yusuke Takahashi ◽  
Minghao Yu ◽  
Asei Tezuka
Keyword(s):  
Plasma Flow ◽  
Spectroscopic Measurement ◽  
Air Plasma

scholarly journals IRTS: Infrared Telescope in Space

1990 ◽  
Vol 123 ◽  
pp. 215-222
Author(s):  
Toshio Matsumoto
Keyword(s):  
Focal Plane ◽  
Near Infrared ◽  
Space Shuttle ◽  
Spectroscopic Measurement ◽  
Small Space ◽  
Valuable Data ◽  
Infrared Telescope ◽  
Wide Wavelength Range ◽  
Infrared Sources ◽  
Very High

AbstractIRTS is a small cryogenically cooled telescope onboard the small space platform SFU (Space Flyer Unit). SFU will be launched with the new Japanese HII rocket on January 1994 and retrieved by the space shuttle.The IRTS telescope has an aperture of only 15 cm diameter, but is optimized to observe diffuse extended infrared sources. Four focal plane instruments are being developed under collaboration between Japan and the U.S.A. IRTS covers a wide wavelength range from near-infrared to submillimeter region, and has a capability for the spectroscopic measurement. Due to newly developed detectors, the sky will be surveyed with very high sensitivities. IRTS will provide valuable data on cosmology, galactic structure, cosmic dust, etc.

Performance enhancement of Savonius wind turbine by blade shape and twisted angle modifications

2021 ◽  
pp. 095765092098794
Author(s):  
Ahmed M Nagib Elmekawy ◽  
Hassan A Hassan Saeed ◽  
Sadek Z Kassab
Keyword(s):  
Wind Turbine ◽  
Performance Enhancement ◽  
Three Dimensional ◽  
Turbulence Models ◽  
Vertical Axis ◽  
Cfd Simulations ◽  
Sliding Mesh ◽  
Blade Shape ◽  
Rotor Shape ◽  
Twisting Angle

Three-dimensional CFD simulations are carried out to study the increase of power generated from Savonius vertical axis wind turbines by modifying the blade shape and blade angel of twist. Twisting angle of the classical blade are varied and several proposed novel blade shapes are introduced to enhance the performance of the wind turbine. CFD simulations have been performed using sliding mesh technique of ANSYS software. Four turbulence models; realizable k -[Formula: see text], standard k - [Formula: see text], SST transition and SST k -[Formula: see text] are utilized in the simulations. The blade twisting angle has been modified for the proposed dimensions and wind speed. The introduced novel blade increased the power generated compared to the classical shapes. The two proposed novel blades achieved better power coefficients. One of the proposed models achieved an increase of 31% and the other one achieved 32.2% when compared to the classical rotor shape. The optimum twist angel for the two proposed models achieved 5.66% and 5.69% when compared with zero angle of twist.

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