Abstract:
An avalanche is a rapid flow of snow down a slope, from either natural triggers or human activity. At present snow gauge and direct measurements are the most commonly used techniques adopted for measuring snow depth. This paper deals with total design and implementation of microcontroller based snow depth sensor using ultrasonic pulses.

INTRODUCTION
Precipitation is mainly in the form of rain and snow. In the universe 5% of annual precipitation is in the form of snow. Snow avalanches occur in higher mountains ....etc

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A virtual retinal display (VRD), also known as a retinal scan display (RSD), is a new display technology that draws a raster display (like a television) directly onto the retina of the eye. The user sees what appears to be a conventional display floating in space in front of them. In the past similar systems have been made by projecting a defocused image directly in front of the user's eye on a small screen, normally in the form of large sunglasses. The user focused their eyes on the background, where the screen appeared to be floating. The d ....etc

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Abstract
The Virtual Retinal Display (VRD) is a unique display technology developed at the Human Interface Technology Laboratory for Virtual Reality and other display applications which require high-resolution in a low-profile, portable head-mounted package. By scanning modulated light directly onto the retina of the eye,Here eliminated the need for screens and heavy, expensive imaging optics while allowing for higher resolution and wider field-of-view. stereoscopic, full color, very high resolution (4K x 3K pixels), 80 Hz refresh display wh ....etc

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VIRTUAL RETINAL DISPLAY

The technologies of virtual reality (VR) and augmented reality (AR) are the new paradigm for visual interaction with graphical environments. The features of VR are interactivity and immersion. To achieve these features, a visual display that is high resolution and wide field of view is necessary. For AR a visual display that allows ready viewing of the real world, with superimposition of the computer graphics is necessary. Current display technologies require compromises that prevent full implementation of VR and AR. ....etc

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Virtual Retinal Display

Information displays are the primary medium through which text and images generated by computer and other electronic systems are delivered to end-users. While early computer systems were designed and used for tasks that involved little interactions between the user and the computer, today's graphical and multimedia information and computing environments require information displays that have higher performance, smaller size and lower cost.

The market for display technologies also has been stimulated by the increasi ....etc

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ABSTRACT
The Virtual Retinal Display„¢ (VRD„¢) technology also known as a retinal scan display (RSD) or retinal projector is a new display technology being developed at Microvision Inc. The displayed image is scanned onto the viewer™s retina using low-power red, green, and blue light sources. Microvision™s proprietary miniaturized scanner designs make VRD system very well suited for head-mounted displays. In this paper we discuss some of the advantages of the VRD technology, various ocular designs for HMD and ot ....etc

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