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Medical oxygen concentrators were developed in the late 1970s. Early manufacturers included Union Carbide and Bendix Corporation. [1] They were initially conceived of as a method of providing a continuous source of home oxygen without the use of heavy tanks and frequent deliveries. [2] Beginning in the 2000s, manufacturers developed portable ...
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An oxygen concentrator takes in air and removes nitrogen from it, leaving an oxygen-enriched gas for use by people requiring medical oxygen due to low oxygen levels in their blood. [4] Oxygen concentrators provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants.
Construction cost estimating software is computer software designed for contractors to estimate construction costs for a specific project. A cost estimator will typically use estimating software to estimate their bid price for a project, which will ultimately become part of a resulting construction contract. Some architects, engineers ...
A cost estimate is the approximation of the cost of a program, project, or operation. The cost estimate is the product of the cost estimating process. The cost estimate has a single total value and may have identifiable component values. A problem with a cost overrun can be avoided with a credible, reliable, and accurate cost estimate. A cost ...
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A home oxygen concentrator for a person with emphysema Nasal cannula Non-rebreather mask. Oxygen can be separated by a number of methods (e.g., chemical reaction, fractional distillation) to enable immediate or future use. The main methods utilized for oxygen therapy include:
Uniformat is a standard for classifying building specifications, cost estimating, and cost analysis in the U.S. and Canada. The elements are major components common to most buildings. The system can be used to provide consistency in the economic evaluation of building projects.