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

Marxism And Economic Theory Essays - Economic Ideologies, Socialism

Marxism And Economic Theory Essays - Economic Ideologies, Socialism Marxism and Economic Theory Human relationships have always been dynamic. Change and adaptability have gone hand in hand with the passage of time for human society. Systems have been developed to regulate, direct and control the resources of this society. The systems are referred to as governments and the resources as the populace or inhabitants and forces of production. A government must be dynamic in its nature reflecting the change in society. At times these systems have resisted the necessity to adapt with its components (Society) creating a deficit between the system and those it regulates. As the deficits develop, they cause instability, and could lead to revolution.1 Theories have been developed to explain the systemic phenomenon called revolution. This paper will discuss three modern theories and apply them to the English revolution of 1640. The first theory, developed by Carl Marx (Marxism), will address the economic evolution in English society. This theory will emphasize and explain how the shift from a feudal/mercantile system to capitalism affected English society. The second, called the Resource Mobilization Theory (RMT) developed by Charles Tilly, will explain how the English organizations (the Crown and the Parliament) effectively obtained, amassed and managed resources. Samuel Huntington's, "Institutional Theory", will argue that the existing government at that time was unable to incorporate the demands and personnel that the socio-economic changes created. Marxism was formulated in the 19th century. Carl Marx and his associate Frederick Engels observed the socio-economic changes that were transpiring in Britain. England was the dominant world power and had the largest industrialized economy during the 1800's. The development of the factory and the institution of the assembly line created a large demand for workers. This demand was satiated by migrating peasant from the rural areas in England and Ireland to developing urban centers. As these urban centers or cities evolved using industry as the economic backbone for the population, a large number of factory workers were accumulated to operate the machinery in horrid conditions. These workers, which would be termed as the peasantry under a feudal system, were now the working class or proletariat. They entered cities with hopes of bettering their lives and survival. Though revolution never took place in England during this period, it allowed Marx to study industrialization, urbanization and imperialism. The theory of Marxism has three basic concepts: historic materialism, forces of production and relations of production. Historic materialism is defined as a society's past performance and present capabilities of satisfying the basic means of life. Humankind's basic needs of eating, drinking and shelter need to be met properly. The forces of production (technology, capital, the infrastructure of society, etc.) are important for the simple fact of who ever controls them controls the society. The last aspect of Marxism, the relations of production, deals directly with the relationships between classes of people (the aristocracy, the middle-class and the working class).2 Marxism includes a predictive analysis of socio-economic structures. Using history, logic and the dynamic nature of humankind as guidelines, Carl Marx attempts to map out a sequence of events which will eventually lead to utopia (anarchy). In his work, Das Capital, Marx details the six steps. These steps are primitive socialism, feudalism, capitalism, socialism, communism and then anarchy. The evolution of the English economic system during the 16th and 17th centuries points to a shift from feudalism to capitalism. This shift is exemplified by the enclosures. The landlords began to fence their property in the common land areas. The "commons" were large plots of grazing and farmable lands that were used by both farmers and artisans. When the land-owners and manorial lords began to partition these lands the concept of private ownership of property was introduced to the socio-economic system.3 During the time period of the 16th and 17th centuries the crown's economic base began a gradual decline. This economic shrinkage came to a spearhead during the reign of Charles I. The monarchy favored a monopoly market system over a competitive one. The purpose for this position was for taxation and control of the profits. As the artisan and merchant populations increased, the policy of the crown began conflicting with economic growth. This created instability in three areas. First, the English