Polymers used in the space environment will inevitably experience aging and degradation which result in changes of the material mechanics, physics and chemical properties, until they lose usefulness.
Once they had determined its usefulness, they flew to New York to brief top editors, buying a seat for the documents so they could keep them in sight.
A related hypothesis holds that proteins themselves are the problem: Once they've outlived their usefulness, they build up in organs and cause trouble, much like road dust can gum up a car engine.
Both guidelines identify the major issue in sore throat management as the identification of patients with Group A streptococcal infections for whom antibiotic treatment is indicated, but they differ in the usefulness they ascribe to the clinical estimation of the likelihood Group A streptococcal infection in making management decisions.
Including this negative factor in the TAM [ 5], as well as the core positive constructs of perceived ease of use and perceived usefulness, they proposed and validated a comprehensive model to explain physicians' acceptance of HITs in the USA.
They have long, long outlived whatever usefulness they may have had.
They rated the usefulness and ease of using the tool, and were asked whether the tool saved time, improved their ability to provide care and whether they would recommend it to other healthcare professionals.
"When you bring a couple together in a series, as any writer will tell you, they lose their usefulness because all the tension, the will-they-won't-they, all of that's gone," Fellowes says.
For decades, thiol compounds have been studied for their radioprotective properties, but they have limited clinical usefulness because they are difficult to administer and have a number of toxic side effects.
They adopt perceived usefulness and perceived ease of use as key variables that influence users' attitude, intention, and actual behavior to use a new technology.
