Aging definition

Their underlying basic assumptions are that they are established for healthy people of employable age. Definitions for OELs include those for ... 

AGE. Although aging involves biochemical processes, it is observed as a physical occurrence. Aging definitely increases the risk of cancer as Fig. C-18 illustrates. 

Insulation systems were first classified according to the material used, and permissible temperatures were established based on the thermal aging characteristics of these materials. For example. Class B insulation was defined as inorganic materials such as mica and glass with organic binders 130°C was the allowable maximum operating temperature. The present definition of insulation system Class B stipulates that the system be proven. . by experience or accepted tests. .. to have adequate life expectancy at its rated temperature, such life expectancy to equal or... 

In order to have effective exchange of air in important locations in a room, the age of the air in those locations should be low. The basis for comparison is the complete mixing scenario. That scenario gives the same age for any air volume selected in the room, identical to the nominal time constant for the ventilation airflow,. A steady-state scenario is assumed. See Sutcliffe for an overview of definitions related to age of air. The various air exchange efficiency indices are presented in Table 8.6. 

The average age of air for all air molecules in the complete room can be found by performing a step-up tracer gas experiment, and by measuring tracer gas concentration Q in the exhaust opening. The same procedure can be used for CFD simulations. The definition for average age of air in the room is... 

Whether any of the formulation variables change the mechanical properties significantly upon aging cannot be answered due to the lack of definition of chemical composition parameters as discussed previously... 

Combustion has a very long history. From antiquity up to the middle ages, fire along with earth, water, and air was considered to be one of the four basic elements in the universe. However, with the work of Antoine Lavoisier, one of the initiators of the Chemical Revolution and discoverer of the Law of Conservation of Mass (1785), its importance was reduced. In 1775-1777, Lavoisier was the first to postulate that the key to combustion was oxygen. He realized that the newly isolated constituent of air (Joseph Priestley in England and Carl Scheele in Sweden, 1772-1774) was an element he then named it and formulated a new definition of combustion, as the process of chemical reactions with oxygen. In precise, quantitative experiments he laid the foundations for the new theory, which gained wide acceptance over a relatively short period. 

Sleep disorders are common. Approximately 50% of adults will report a sleep complaint over the course of their lives.2 In general, sleep disturbances increase with age, and each disorder may have gender differences. The full extent and impact of disordered sleep on our society are not known because many patients sleep disorders remain undiagnosed. Normal sleep, by definition, is a reversible behavioral state of perceptual disengagement from... 

Erectile dysfunction (ED) is defined as the inability to achieve or maintain an erection sufficient for sexual intercourse. The definition is very subjective due to differences in desired or needed rigidity in patients of different ages and in different types of relationships. Patients may refer to their dysfunction as impotence, but the National Institutes of Health Consensus Development Conference recommends that the term erectile dysfunction replace the term impotence due to confusion with other forms of sexual dysfunction and the negative connotation associated with the term impotence.1 Patients may also develop libido or ejaculatory disorders, but these are not considered erectile dysfunction. 

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