نتایج جستجو برای: خوشهبندی optics

تعداد نتایج: 33881  

فریدون رهنمای رودپشتی, مهدیه کلانتری دهقی

تشخیص فرآیند حاکم بر بازدهیهای بازار سهام به منظور اخذ تصمیم بهینه و کاهش هزینه ریسک اهمیتفراوانی برای سرمایهگذاران و سیاستگذاران مالی دارد . اهمیت تحلیل بازارها و تلاش برای درک بهتر آنهاموجب شد که پس از به چالش کشیده شدن مفروضات بازار کارا و کشف حقایق جهان شمول دنبالههای پهن،خوشهبندی نوسانات در سریهای زمانی مالی، تحلیلگران از مدلهای با خواص کاملاً تصادفی با توزیع نرمال بهسمت مدلهای لوی و مولتی ...

2014
PH I LI K. J. van Oostrum

In 1854 J. C. Maxwell devised his fish-eye lens a sphere with a radially diminishing refractive index [*1. The optical characteristics of this lens, which can produce aperfect image of an object, as the computer plot above suggests, are fairly easy to calculate analytically. This is not generally the case with optical elements of varying refractive index as used today for data transmission. The...

Journal: :Applied optics 2014
Oleg V Angelsky Anton S Desyatnikov Gregory J Gbur Steen G Hanson Yoko Miyamoto Tomasz Szoplik

This feature issue of Applied Optics contains a series of selected papers reflecting recent progress of correlation optics and showing, in part, the trend from micro-optics to nano-optics.

1998
John M. Jowett

A new optics with phase advances mx = 131 ° and my = 90 ° in the arc cells has been proposed for LEP. This note summarises the main results from the optics evaluation procedure that is now routinely applied to new LEP optics. This includes the study of the orbits, optics and dynamic apertures of an ensemble of imperfect machines with corrections similar to those applied in operation. It provide...

Journal: :Physical Review Accelerators and Beams 2017

2010
Joseph A. Izatt Gregory W. Faris

We are very pleased to introduce the inaugural issue of Biomedical Optics Express. Published by The Optical Society, Biomedical Optics Express is a new peer-reviewed journal focusing on biomedical optics and biophotonics. Biomedical Optics Express is intended to become OSA’s principal outlet for serving the biomedical optics community with rapid, open-access publication of biomedical content. A...

Zigzag ZnS thin films prepared by thermal evaporation method using glancing angle deposition (GLAD) technique. ZnS films with zigzag structure were produced at deposition angles of 0˚, 60˚ and 80˚ at room temperature on glass substrates. Surface morphology of the films w:as char:acterized by using field emission scanning electron microscopy (FESEM). The optical properties of the specimens were i...

فتاحی, بهرام ,

The diffractive multifocal IOL provides simultaneous bifocal imaging by utilizing both diffractive and refractive optics. In both distant and near vision, there is a clear highly focused image on the retina. The second image is highly defocused, providing only faint background illumination. A small amount of the light goes to the higher orders of diffraction which are not perceptible by eyes. T...

In this paper, the physical optics method is used to study the problem of electromagnetic scattering from Haack series nose cone. First, a meshing scheme is introduced which approximates the curvature of the surface by piecewise linear functions in both axial and rotational directions. This results in planar quadrilateral patches and enables efficient determination of the illuminated region and...

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