نتایج جستجو برای: refractive surfaces

تعداد نتایج: 150251  

Journal: :Journal of cataract and refractive surgery 2002
Damien Gatinel Thanh Hoang-Xuan Dimitri T Azar

PURPOSE To compare the shape and volume of the lenticules of corneal tissue ablated for the correction of spherical, cylindrical, and spherocylindrical refractive errors using Boolean operations of theoretical 3-dimensional (3-D) surfaces. SETTING Department of Ophthalmology, Rothschild Foundation, Paris, France. METHODS Digital modeling software was used to perform graphic representations ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1389

در این پروژه خواص اپتیک غیرخطی تعدادی از بلورهای مایع نماتیک آلاییده بارنگینه مطالعه شده است. یکی از اهداف اصلی توسعه بلورهای مایع و رنگینه های جدید، مطالعه بر روی پارامترهای فیزیکی آنها برای بهبود و توسعه عملکرد انها، کاربردهای موجود و جستجوی کاربردهای جدید می باشد. علاوه بر بزرگ بودن غیرخطیت نور القایی در بلورهای مایع، با استفاده از یک میدان الکتریکی یا مغناطیسی با قدرت کم، این خواص نوری برا...

حمیده کاویانی, , عبدالعلی رمضانی, , محمد الماسی کاشی, ,

  Band structure of porous alumina photonic crystal in the Γ X direction was calculated using order-N method . In a comparison of calculated results with experimental data of reflective and absorptive index, the variation of refractive index of alumina in the external region of oxide layer, around the pores were studied. A Gaussian distribution function was adopted for phosphate anions in the e...

Journal: :Arquivos brasileiros de oftalmologia 2007
Luis Alberto Vieira de Carvalho

PURPOSE To develop and implement an algorithm for simulation of photorefractive surgery. It is well known that many flying-spot lasers in the market have limitations in correcting higher order aberrations, but there is little quantitative information about errors related to aberration complexity. METHODS By applying known surfaces described by Zernike polynomials of different orders it was po...

2013
Takaki Nakayama Hisashi Naito Takeshi Matsumoto Masao Tanaka

1. Abstract Corneal refractive surgery is a promising technique to correct irregularities of cornea shape accompanying various types of aberration in eye ball system, and correction of refractive power for nearsightedness and farsightedness are fundamental application of refractive surgery. However there have been reported some risks such as over-/under-corrections, abnormal sight symptom like ...

2012
Simeon C. Baker-Finch Keith R. McIntosh

A common misconception is that alkaline textured silicon solar cell surfaces are characterised by features that are pyramidal and bounded by {111} planes. In preference to the typical approach of observing scanning electron microscope images, we analyse reflection distributions from various pyramidal textures and find that {111} faceted pyramids are a poor approximation to the features on such ...

Utilizing boundary integral method (BIM), we investigate molecularspontaneous emission rate enhancement in the vicinity of plasmonic nanoparticles ofelliptical cross section. These types of nanoparticles can considerably enhance themolecule decay rate. The spontaneous emission rate can be modified by altering theaspect ratio of the elliptical nanoparticle, the background refractive index andnan...

Journal: :Coatings 2022

Among the different nanostructures involved in improvement of material properties, carbon nanotubes occupy a specific place because their small refractive index, extended surface, and large Young’s module, which can all provoke dramatic change basic matrix characteristics. Inorganic crystals, semiconductors, metals, conductive compounds, some polymer structures whose surfaces are treated with d...

Journal: :Experiments in Fluids 2021

A single-camera synthetic Schlieren method is introduced to measure the height of a dynamic free liquid surface in container with flat bottom. Markers placed on bottom, seen through surface, are virtually displaced due light refraction at surface. According Snell’s law, marker displacements depend refractive indices transparent and air, its spatial gradients. We solve resulting governing nonlin...

In this research, Ag nanoparticles were prepared by using g-radiation at concentration of 5.18×10-3 M and irradiated at different doses. A green laser was employed as excited source for measuring nonlinear refractive index and absorption coefficient. The measurements were done by z-scan method for both, closed and open aperture at temperature room. We deduced that with growth of size of Ag nano...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید