CDM

CDM may refer to:

Organizations

Science and technology

Other uses

Lambda-CDM model

The ΛCDM (Lambda cold dark matter) or Lambda-CDM model is a parametrization of the Big Bang cosmological model in which the universe contains a cosmological constant, denoted by Lambda (Greek Λ), associated with dark energy, and cold dark matter (abbreviated CDM). It is frequently referred to as the standard model of Big Bang cosmology, because it is the simplest model that provides a reasonably good account of the following properties of the cosmos:

The model assumes that general relativity is the correct theory of gravity on cosmological scales. It emerged in the late 1990s as a concordance cosmology, after a period of time when disparate observed properties of the universe appeared mutually inconsistent, and there was no consensus on the makeup of the energy density of the universe.

Construction (Design and Management) Regulations 2007

The Construction (Design and Management) Regulations 2007, also known as CDM Regulations or CDM 2007, previously defined legal duties for the safe operation of UK construction sites. They were superseded by the Construction (Design and Management) Regulations 2015. The regulations placed specific duties on clients, designers and contractors, to plan their approach to health and safety. They applied throughout construction projects, from inception to final demolition and removal.

They were introduced by the Health and Safety Executive's Construction Division to:

History

CDM 2007 was a result of an EU Directive 92/57/EEC (OJ L245, 26.8.92), the 'Construction Sites Directive'. They came into force on April 6, 2007 and replaced a 1994 predecessor as amended in 2000 and 1996 Health and Safety regulations. They were superseded by the Construction (Design and Management) Regulations 2015 with effect from 6th April 2015, with transitional arrangements for existing construction projects to comply with the 2007 regulations until October 2015.