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1 Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.2  AAS is used particularly for detecting the concentrations of metal ions in solutions. Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.
An Application Object Server (AOS) is a core component of the Microsoft Dynamics AX installation and is installed by using Setup. An AOS enforces security, manages connections between clients and the database, and provides the foundation where business logic for Microsoft Dynamics AX is executed. An AOS is implemented as a Microsoft Windows service. By default, an AOS is listed in the Services pane as Microsoft Dynamics AX Object Server 6.0$ InstanceName. As a Windows service, AOS works in the following ways: 1  An AOS runs in the security context of either a specific domain account or the NT Authority/Network Service account, depending on the setup. 2  The status of an AOS is reported to the Windows event logs.