Group

Group may refer to:

Groups of people

In science and technology

In mathematics

In chemistry

In computing and the internet

Other uses in science and technology

Other uses

Shot grouping

In shooting, a shot grouping, or simply grouping, is the placement of multiple shots on a target, the shots taken in one shooting session. The closeness of the grouping, the nearness of all the shots to each other, is a measure of the accuracy of a weapon, and a measure of the shooter's consistency and skill.

Uses of the term

For firearms that shoot one round at a time, a shot grouping can be used to measure the accuracy of the system comprised out of weapon as well as the precision and uniformity of the ammunition by fixing the weapon into position on a test mount, and aiming it at a target. Multiple shots using rounds from same type and batch are fired to observe how the weapon groups the shots. If a person holds the weapon and shoots it, the grouping measures the combination of the person's skill and the weapon's accuracy.

In shotgun shooting, the grouping is also called the pattern. The pattern is the spread of shot from a single shotgun shell, measured as the smallest circle containing all the shots on the target. The barrel of a shotgun is designed to deliver a wide or narrow grouping, depending on the expected use. Shooting at close range indicates a cylinder bore barrel to deliver a wide grouping, while for hunting at longer distances such as 50 yards or meters, a choke is recommended for a tighter grouping.

Stratigraphic unit

A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

Units must be mappable and distinct from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%".

Lithostratigraphic units

Sequences of sedimentary and volcanic rocks are subdivided on the basis of their lithology. Going from smaller to larger in scale, the main units recognised are Bed, Member, Formation, Group and Supergroup.

Bed

A bed is a lithologically distinct layer within a member or formation and is the smallest recognisable stratigraphic unit. These are not normally named, but may be in the case of a marker horizon.

Member

A member is a named lithologically distinct part of a formation. Not all formations are subdivided in this way and even where they are recognized, they may only form part of the formation.

TMF

TMF may refer to:

TMF Nederland

TMF (abbreviation of The Music Factory) was a 24-hour music channel operated by Viacom International Media Networks in the Netherlands. The channel was previously in every standard TV package, but it is ceased operating on 1 September 2011. The channels operations were based in Amsterdam. The channel was previously known as TMF6 and TMF9 respectively.

History

TMF was launched on 1 May 1995 by Lex Harding (then director of Radio 538), producer Herman Braakman, director Ewart van der Horst and multimedia company Arcade. It was the first Dutch music station competing against MTV Europe within the region. Netherlands had not at that time own music station, in most municipalities could only English-language MTV Europe are received. In the beginning, TMF had a limited reach in the Netherlands, but was quickly increasing. The nascent channel featured Sylvana Simons, Bridget Maasland, Isabelle Brinkman, Fabienne de Vries, Ruud de Wild, Michael Pilarczyk, Wessel van Diepen and Erik de Zwart as its veejays. During the years the VJ line-up changed to include Tooske Breugem, Daphne Bunskoek and Mental Theo. The last VJs on the channel included: Miljuschka Witzenhausen and Nikkie Plessen.