Results 121 to 130 of about 55,377 (313)

A Study On The Frequency Of Different Types Of Optical Low Vision Aids Prescribed For Low Vision Patients Examined In The Clinic Of Optometry, Faculty Of Rehabilitation Sciences Shahid Beheshti University Of Medical Sciences, Tehran, 1387

open access: yesṬibb-i Tavānbakhshī, 2012
Background and Aim: Different diseases can be the cause of low vision. In the case of low vision, visual acuity with conventional optical devices such as glasses and contact lenses is between” 20/70 to 20/200”.
Mohammad Ghassemi Broumand   +4 more
doaj  

Euclid preparation

open access: yesAstronomy & Astrophysics
Context. The Euclid galaxy survey is designed to measure the spectroscopic redshift of emission-line galaxies (ELGs) by identifying the Hα emission line in their slitless spectra.
Risso I.   +318 more
doaj   +1 more source

James Short and John Harrison: personal genius and public knowledge

open access: yesScience Museum Group Journal, 2014
The instrument maker James Short, whose output was exclusively reflecting telescopes, was a sustained and consistent supporter of the clock and watch maker John Harrison.
Professor Jim Bennett
doaj   +1 more source

9. The next telescopes

open access: yes, 2016
Each question that telescopes have helped answer has led to new questions: what is dark matter and dark energy? How did the first galaxies form? Are there habitable, Earth-like exoplanets?
Geoff Cottrell
core   +1 more source

Evaluating the Local Response of a Novel Injectable Capsule for Drug Delivery in the Trachea

open access: yesThe Laryngoscope, EarlyView.
A novel PLGA polymer capsule was developed for localized pretracheal drug delivery and evaluated for short‐term local tissue safety in a rabbit model. Implant placement was confirmed by ultrasound and was well tolerated over 14 days, with preservation of airway patency, native tracheal architecture, and biomechanical properties.
Denzel Ryan D. Cruz   +7 more
wiley   +1 more source

Abordando o ensino de óptica através da construção de telescópios

open access: yesRevista Brasileira de Ensino de Física
A proposta deste trabalho é a construção artesanal de um telescópio refletor do tipo Newtoniano relacionando conteúdos abordados na disciplina de óptica, como a formação de imagens em lentes e espelhos, aberrações esféricas e cromáticas, interferência e ...
Tamara O. Bernardes   +5 more
doaj   +1 more source

Telescopes and space exploration [PDF]

open access: yes, 1976
The necessity for different types of telescopes for astronomical investigations is discussed. Major findings in modern astronomy by ground-based and spaceborne telescopes are presented. Observations of the Crab Nebula, solar flares, interstellar gas, and
Brandt, J. C., Maran, S. P.
core  

Controlling the Center of Mass Motion of Levitated Particles Using Structured Wavefronts

open access: yesLaser &Photonics Reviews, EarlyView.
Optically levitated particles have great potential for quantum‐enhanced sensing. Precise control of the trapping beam is crucial to improve the stability and confinement of these systems. Here, we study how structured wavefronts can be used to control the center‐of‐mass motion of levitated particles, enhancing trap stiffness and enabling stable ...
Shah Jee Rahman   +7 more
wiley   +1 more source

Neural blind deconvolution to reconstruct high-resolution ground-based solar observations

open access: yesAstronomy & Astrophysics
Context. Ground-based solar observations enable unprecedented spatial, spectral, and temporal resolution of the lower solar atmosphere, yet Earth’s turbulent atmosphere imposes significant limitations, requiring advanced post facto image reconstruction ...
Schirninger C.   +4 more
doaj   +1 more source

Efficient and Tunable Narrowband Second‐Harmonic Generation by a Large‐Area Etchless Lithium Niobate Metasurface

open access: yesLaser &Photonics Reviews, EarlyView.
An etchless lithium niobate (LN) metasurface with a slanted periodic TiO2 grating enables efficient and narrowband second‐harmonic generation (SHG) thanks to the light confinement in the LN film granted by quasi‐bound‐state‐in‐the‐continuum (q‐BIC) modes.
Yaping Hou   +10 more
wiley   +1 more source

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