Human Vision In Space Essays - Vision, Visual System, Ophthalmology

Human Vision In Space Human visual hardware is a result of a billion years of evolution within the earths atmosphere where light is scattered by molecules of air, moisture, particular matter etc. However as we ascend into our atmosphere with decrease density, light distribution is changed resulting in our visual hardware receiving visual data in different format. Some Aspects to Consider: 1. Visual acuity is the degree to which the details and contours of objects are perceived. Visual acuity is usually defined in terms of minimum separable.Large variety of factors influence this complex phenomenon which includes : # Optical factors- state of the image forming mechanisms of the eye. # Retinal factors such as the state of the cones. # Stimulus factors such as illumination, brightness of the stimulus, contrast between the stimulus and background, length of time exposed to the stimulus. * Minimum separable: shortest distance by which two lines can be separated and still be perceived a s two lines. "During the day, the earth has a predominantly bluish cast..... I could detect individual houses and streets in the low humidity and cloudless areas such as the Himalaya mountain area.... I saw a steam locomotive by seeing the smoke first..... I also saw the wake of a boat on a large river in the Burma-India area... and a bright orange light from the British oil refinery to the south of the city (Perth,Australia.)" The above observation was made by Gordon Cooper in Faith 7 [1963] and which generated much skepticism in the light of the thesis by Muckler and Narvan "Visual Surveillance and Reconnaissance from space vehicles" in which they determined that a visual angle of ten minutes was the operational minimum, and that the minimum resolvable object length [M.R.O.L] at an altitude of 113 miles would be 1730 ft. This limitation of acuity was revised the next year to 0.5 seconds of arc for an extended contrasting line and 15 seconds of arc for minimum separation of two points sharply contrasting with the background. Orbiting at 237 miles in the skylab it was possible to see the entire east coast [Canada to Florida Keys] and resolve details of a 500 feet long bridge based on inference. Of Interest is the fact that even though the mechanical eye [camera systems] can resolve objects greater than fifty times better than the human eye, without the human ability to infer, interpretation of the data is meaningless. Conclusion: Visual acuity in space exceeds that of earth norm when objects with linear extension such as roads, airfields, wake of ships etc. 2. Stereoscopic vision: the perception of two images as one by means of fusing the impressions on both retinas. In space one has to deal with a poverty of reference points. For hardware evolved in a reference oriented paradigm, this possess a grave problem. Once out of the space craft and gazing outward, the eye can only fix on the stars [without even a twinkle] which for all practical p urpose is at infinity ie. without stereoscopic vision "Empty field myopia" prevails. Empty Field Myopia is a condition in which the eyes, having nothing in the visual field upon which to focus, focus automatically at about 9 feet . An astronaut/cosmonaut experiencing empty field myopia focusing at 9 ft would be unable see objects at a range close as 100 ft. If another spacecraft, satellite, meteorite or L.E.M entered his field of vision, he would not be able to determine the size nor the distance. Solution: Man does not face any hostile environment in his birthday suit, the clothing industry and need for walk in closet say it all. In space we will wear our exoskeleton just as we wear winter jackets in winter and we will wear our helmets with visors to maintain our internal environment, filter out all those nasty rads etc. Since Empty Field Myopia is secondary to loss of reference points why not just build them into the visor itself giving the eye points of reference-- create a virt ual reality This line of speculation leads to amazing concepts...... To learn more about the concept of virtual universe in the helmet read: Journal: Air article: Big Picture

NYSE essays

NYSE essays The NYSE was first housed at a rented room at 40 Wall Street in 1817. A 5-story building at 10 Broad Street opened in 1865.It was enlarged and remodeled during the 1870s and 1880s, then was demolished in 1901 to make way for the current building.The new Exchange building at 18 Broad Street opened in 1903.Styled in the classical-revival manner popular at the time, it was designed by George B. Post, a well-known architect and engineer.The sculptor John Quincy Adams Ward designed the pediment.The eleven figures in the pediment are emblems of American commerce and industry.The central figure symbolizes integrity, bordered by figures representing sources of wealth. Other figures personify agriculture, mining, science, industry and invention.The view of lower Manhattan from the NYSE building includes the intersection of Nassau, Broad and Wall Streets and looks directly on Federal Hall, the historic site of George Washington's inauguration in 1789.It also includes Trinity Church at the end of Wall Street.The Main Floor occupies 36,000 square feet with a ceiling of 86 feet, including the Garage, Blue Room and Expanded Blue Room.It consists of 17 trading posts, 340 trading positions and 3,000 people who work on the trading floor.Trowbridge ...

EXEGESIS PAPER Essay Example | Topics and Well Written Essays - 1500 words

EXEGESIS PAPER - Essay Example So the words used of the different translations have the same meaning: the speaker or sufferer feels he is abandoned or deserted because of the suffering and anguish. Words used in the first verse instantly provide a description of suffering: anguish, groaning, roaring, and the phrases â€Å"desperately for help†, â€Å"come to my rescue†, â€Å"far from saving me†, all reveal a desperate situation asking for instant help and rescue. Verses 22 and 23 speak of banquet or meeting, assembly, and the phrases â€Å"I will praise you,† â€Å"I will tell of your name to my brothers,† â€Å"glorify him,† â€Å"fear the Lord†, â€Å"praise him, all ye the seed of Jacob, glorify him, all ye the seed of Israel†. All these reveal that the sufferer – Jesus Christ – on the cross feels he is comforted and saved by the presence of the Father in him. After the â€Å"abandonment† feeling, there is comfort and joy. Psalm 22 is a collection of songs originally for the Temple of Jerusalem. The Levites had a role in compiling these songs which David composed. As time went by, the psalms were recited or sang as a form of prayer or lamentation. The psalms formed the prayer of ancient Israel, but today they are the foundation of Christian liturgical prayer, used by Christians and the laity alike.1 These are useful prayer when we would like to converse with God, or listen to him instead of talking. Reciting the psalms is a form of listening to him. God whispers to our souls through his songs. Verses 1-21 are prophecies of Jesus’ suffering in Calvary. But it was written a thousand years before it actually happened. This is a great revelation of God – the Scriptures as inspired by the Holy Spirit. Only God can tell an event a thousand years before it happens and with such an unmistakable accuracy.2 The psalm may have been written by David when Saul was