In the Beer Lambert Law (equation 3) the term IT/Io is called transmittance. This form of spectroscopy has a setup similar to the one used for Absorption. Reflectance spectroscopy is the study of light as a function of wavelength that has been reflected or scattered from a solid, liquid, or gas.
Definition of metadata: Data that serves to provide context or additional information about other data. For example, information about the title, subject, author, typeface, enhancements, and size of the data file of a ...
Metadata means data about data. In the database world, metadata refers to the schema, the structure of the database. One significant complication is that the SQLAlchemy view of a database's structure may be different than the structure at the SQL level.Accordingly, there are three ways to use metadata to work with an SQL database.If you are working with an existing SQL database, you can ask SQLAlchemy to use reflection to determine the structure of the database, then use it as it is. MetaData instance is basically a container for Table instances that describe its constituent tables. For two different ways to call its constructor, see Section 4.1, âReflection: finding out the structure of an existing SQL databaseâ and Section 4.2, âBuilding your own schemaâ .