Aviation Medical Reports PDF Download

Author: Henry W. Mertens
Publisher:
ISBN:
Category : Adaptation (Physiology)
Languages : en
Pages : 12

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1390

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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Author: Henry W. Mertens
Publisher:
ISBN:
Category :
Languages : en
Pages : 7

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Visual judgments of size, distance, slant, etc. in the flying situation are often made under reduced cue conditions, especially during night flying. In the experimental study of spatial perception under these conditions, experiments often require long sessions in the dark and involve stimuli of low luminance allowing considerable dark adaptation to occur. The resulting change in visual sensitivity makes the control of light more difficult and increases the possibility that extraneous cues may contaminate the data. Light adaptation devices are often used to control this sensitivity but themselves may introduce extraneous cues, e.g., size and distance cues. This report describes a light adaptation device which produces a homogeneous adaptation field without extraneous cues and which can be used easily between experimental observations even though S is in an otherwise dark observation position.

Author: United States. Office of Aviation Medicine
Publisher:
ISBN:
Category : Aviation medicine
Languages : en
Pages : 414

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Author:
Publisher:
ISBN:
Category : Medicine
Languages : en
Pages : 1712

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Author: Alex Joseph Valentine
Publisher: Frontiers Media SA
ISBN: 2889667790
Category : Science
Languages : en
Pages : 190

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Book Description
Phosphate is an essential mineral to all plants, and its availability in soils is an increasing challenge for agriculture. Phosphate is abundant in soils but its biological availability is often low due to the complexes that it forms with soil minerals and compounds. The biological availability of Phosphate is further reduced in acidic soils, which represent approximately 40% of earth’s arable agricultural lands. Agricultural systems compensate Phosphate deficiency with fertilizers coming from the mining of rock phosphate, which is estimated to exhaust within the next 50 years. For these reasons, Phosphate limitations in natural and agricultural ecosystems is going to become a global problem, and we urgently need to better understand how plants respond to Phosphate deficiency.

Author: Walter C. Gogel
Publisher:
ISBN:
Category : Depth perception
Languages : en
Pages : 16

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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1182

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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index

Author: Ian P. Howard
Publisher: Oxford University Press
ISBN: 0199877351
Category : Psychology
Languages : en
Pages : 642

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Book Description
The three-volume work Perceiving in Depth is a sequel to Binocular Vision and Stereopsis and to Seeing in Depth, both by Ian P. Howard and Brian J. Rogers. This work is much broader in scope than the previous books and includes mechanisms of depth perception by all senses, including aural, electrosensory organs, and the somatosensory system. Volume 1 reviews sensory coding, psychophysical and analytic procedures, and basic visual mechanisms. Volume 2 reviews stereoscopic vision. Volume 3 reviews all mechanisms of depth perception other than stereoscopic vision. The three volumes are extensively illustrated and referenced and provide the most detailed review of all aspects of perceiving the three-dimensional world. Volume 2 addresses stereoscopic vision in cats and primates, including humans. It begins with an account of the physiology of stereoscopic mechanisms. It then deals with binocular rivalry, binocular summation, binocular masking, and the interocular transfer of visual effects, such as the motion aftereffect and visual learning. The geometry of the region in binocular space that creates fused images (the horopter) is discussed in some detail. Objects outside the horopter produce images with binocular disparities that are used for stereoscopic vision. Two chapters provide accounts of mechanisms that bring the images into binocular register and of stimulus tokens that are used to detect binocular disparities. Another chapter discusses cyclopean effects, such as cyclopean illusions, cyclopean motion, and binocular direction that are seen only with binocular vision. Stereoacuity is the smallest depth interval that can be detected. Methods of measuring stereoacuity and factors that influence it are discussed. Two chapters deal with the various types of binocular disparity and the role of each type in stereoscopic vision. Another chapter deals with visual effects, such as figure perception, motion perception, and whiteness perception that are affected by the relative distances of stimuli. The spatiotemporal aspects of stereoscopic vision, including the Pulfrich stereomotion effect are reviewed. The volume ends with an account of techniques used to create stereoscopic displays and of the applications of stereoscopy.

Author: Ian P. Howard
Publisher: OUP USA
ISBN: 0199764158
Category : Medical
Languages : en
Pages : 643

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Book Description
Volume 2 addresses stereoscopic vision. It starts with the physiology of stereoscopic mechanisms. It then deals with binocular rivalry, binocular summation, and interocular transfer. A review of how images are brought into binocular register is followed by a review of stimulus tokens used to detect disparities. Cyclopean effects, such as cyclopean illusions, cyclopean motion, texture segregation, and binocular direction are reviewed. Factors that influence stereoacuity are discussed. Two chapters describe how stimuli in distinct depth planes produce contrast effects, and affect motion perception and whiteness perception. The Pulfrich stereomotion effect and perception of motion in depth are reviewed. The volume ends with a review of applications of stereoscopy.