Abstract. 1  The aim of this exploratory study was to compare internet sex offenders with a matched group of child molesters in the Greater London Area. Over an 8-month period 210 subjects were assessed, of whom 90 were internet sex offenders and 120 were child molesters.
SI Base Units The SI (SystÃ¨me International d'UnitÃ©s) is a globally agreed system of units, with seven base units. Formally agreed by the 11th General Conference on Weights and Measures (CGPM) in 1960, the SI is at the centre of all modern science and technology. The definition and realisation of the base and derived units is an active research topic for metrologists with more precise methods being introduced as they become available.
For example, the SI derived unit of area is the square metre (m 2), and the SI derived unit of density is the kilogram per cubic metre (kg/m 3 or kg m â3). The degree Celsius (see the table below) has a somewhat unclear status, and is arguably an exception to this rule. The names of SI units are written in lowercase.n addition to the two dimensionless derived units radian (rad) and steradian (sr), 20 other derived units have special names. Some other units such as the hour, litre, tonne, and electron volt are not SI units, but are widely used in conjunction with SI units.