COASTAL WETLANDS |
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In physical geography, a wetland is an environment "at the interface between truly terrestrial ecosystems...and truly aquatic systems...making them different from each yet highly dependent on both" (Mitsch & Gosselink, 1986). In essence, wetlands are ecotones.
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ECONOMIC ANALYSIS |
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Economic base analysis was developed by Robert Murray Haig in his work on the Regional Plan of New York in 1928. Briefly, activities in an area divide into two categories basic and non-basic. Basic industries are those exporting from the region; non-basic (or service) industries support basic industries. Because of data problems, it is not practical to study industry output and trade flows to and from a region. As an alternative, basic and non-basic concepts are operationalized using employment data.
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EMPLOYMENT |
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Employment is a contract between two parties, one being the employer and the other being the employee. In a commercial setting, the employer conceives of a productive activity, generally with the intention of creating profits, and the employee contributes labour to the enterprise, usually in return for payment of wages.
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HELICOPTERS |
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A helicopter is an aircraft which is lifted and propelled by one or more horizontal rotors (propellers). Helicopters are classified as rotary-wing aircraft to distinguish them from conventional fixed-wing aircraft. The word helicopter is derived from the Greek words helix (spiral) and pteron (wing). The engine-driven helicopter was invented by the Slovak inventor Jan Bahyl. The first stable, single-rotor, fully-controllable helicopter to enter large full-scale production was made by Igor Sikorsky in 1942.
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PTSD - POST TRAUMATIC STRESS DISORDER |
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Post-traumatic stress disorder (PTSD) is a term for certain psychological consequences of exposure to, or confrontation with, stressful experiences that the person experiences as highly traumatic. [1] These experiences can involve actual or threatened death, serious physical injury, or a threat to physical and/or psychological integrity. It is occasionally called post-traumatic stress reaction to emphasize that it is a routine result of traumatic experience rather than a manifestation of a pre-existing psychological weakness on the part of the patient.
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