The simplest mathematical method to estimate tortuosity is the arc-chord ratio: the ratio of the length of the curve (L) to the distance between the ends of it (C): Arc-chord ratio equals 1 for a straight line and is infinite for a circle.
ERS is a set of computer programs set to run in a specified order on the UNISYS Mainframe at the Enterprise. Computing Center in Martinsburg, West Virginia and the Enterprise Computing Center in Memphis, (ECC-MTB and. ECC-MEM) Tennessee. All ERS information is housed on the ERS database at each computing center.
Enterprise resource planning (ERP) is business management softwareâtypically a suite of integrated applicationsâthat a company can use to collect, store, manage and interpret data from many business activities, including:1  Product planning, cost.2  Manufacturing or service delivery.owever, ERP system development is different from traditional system development. ERP systems run on a variety of computer hardware and network configurations, typically using a database as an information repository.