منابع مشابه
Properties of moiré magnifiers
Moiré magnification can be observed visually if an array of identical objects is viewed through an array of identical microlenses with a different period. Theoretical analysis and experimental results of the moiré image obtained by moiré magnifier are presented. Conditions for erect and inverted moiré magnifications are derived and interpreted. Virtual erect images are observed only when the pe...
متن کاملScreen Magnifiers: Evolution and Evaluation
isually impaired people (VIP) have difficulty interacting with computer systems that present the majority of their output visually. VIP who have no functional sight can use screen readers— assistive programs that present the visual output as speech or that drive refreshable Braille displays. 1 The most widespread example of such software is Microsoft Narrator, a screen reader that ships with Wi...
متن کاملThermoacoustic - Piezoelectric Systems with Dynamic Magnifiers
Title of Document: THERMOACOUSTIC-PIEZOELECTRIC SYSTEMS WITH DYNAMIC MAGNIFIERS Mostafa Nouh, Doctor of Philosophy, 2013 Directed By: Professor Amr Baz Department of Mechanical Engineering Thermoacoustic energy conversion is an emergent technology with considerable potential for research, development, and innovation. In thermoacoustic resonators, self-excited acoustic oscillations are induced i...
متن کاملEye movements and reading with plus-lens magnifiers.
PURPOSE This study aimed to determine the eye movement parameter(s) that is primarily affected when fully sighted subjects use plus-lens magnifiers for reading. METHODS Two forms of plus-lens magnifier were used: hand-held and spectacle-mounted. Eye movements were recorded using an infrared limbal reflection system as subjects read passages of text with and without the magnifiers. Data were c...
متن کاملFiber-optic reading magnifiers for the visually impaired.
We describe fiber-optic stand magnifiers specifically designed for use as low-vision reading aids. Application of this technology results in better optical and ergonomic properties. The fiber-optic magnifiers (tapers) provide bright, uniformly illuminated, distortion-free images. The reading material can be scanned without the user's having to bend directly over the magnifier. One can further i...
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ژورنال
عنوان ژورنال: Nature Nanotechnology
سال: 2009
ISSN: 1748-3387,1748-3395
DOI: 10.1038/nnano.2009.228