The Rockwell hardness number is expressed as a combination of the measured numerical hardness value and the scale letter preceded by the letters, HR. For example, a hardness value of 80 on the Rockwell A scale is reported as 80 HRA. Regular Rockwell Hardness Testing- Measures the bulk hardness of the material.
What is aPaaS? aPaaS is an acronym for application Platform-as-a-Service. According to Gartner, aPaaS is a cloud service that offers development and deployment environments for application services. Platform as a service (PaaS) is defined as application infrastructure functionality enriched with cloud characteristics and offered as a service.
The apnea-hypopnea index (AHI) is an index of severity that combines apneas and hypopneas (slow or shallow breathing). Apnea was defined as cessation of airflow for at least 10 seconds via mouth or nose, whereas hypopnea was defined as at least 50% flow limitation with 3% desaturation.