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Free Ebook Holographic dielectric grating: theory and practice

Submitted by antoq on Sat, 11/15/2008 - 02:31

A holographic dielectric grating is a diffraction grating comprised of a periodic variation of the refractive index of a medium, and is produced by the interference pattern of two monochromatic waves. Emphasis is placed upon photographic emulsion as the medium for recording the pattern, but the treatment is general and includes any material that can have an internal modulation of the refractive index. Three topics are treated: the effective dielectric constant of the emulsion, the diffraction of light by dielectric gratings, and the techniques for producing gratings with high efficiency and good resolution.

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Ebook Business Model Innovation in The Digital Economy

Submitted by antoq on Wed, 01/21/2009 - 02:36

Since the beginning of Internet commerce in the early 1990s, we have witnessed the first boom and bust cycles of the Internet economy. Is the Internet economy going anywhere? Is the e-commerce revolution over? The answer is yes and no respectively. The current correction has forced a more cautious approach that focuses on feasible business models and solid performance. The Internet and e-commerce are here to stay. E-commerce will continue to enhance operational efficiencies and bring new opportunities for growth and competitive advantage.
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Ebook A Survey on Hair Modeling: Styling, Simulation, and Rendering

Submitted by antoq on Fri, 12/12/2008 - 07:19

Screen shot A Survey on Hair Modeling: Styling, Simulation, and Rendering

Modeling hair is essential to computer graphics for various applications; however, realistically representing hair in structure, motion and visual appearance is still an open challenge. Hair modeling is important for creating convincing virtual humans for many diverse CG applications.

Hair modeling is a difficult task primarily due to the complexity of hair. A human head typically consists of a large volume of hair with over 100,000 hair strands. However, each
individual hair strand is quite small in diameter. Considering this duality, researchers have examined whether hair should be treated as an overall volume or as individual interacting hair strands. currently, there is no method that has been accepted as the industry standard for modeling hair.

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