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.

Balance of Power (album)

Balance of Power is the twelfth studio album by the Electric Light Orchestra (ELO) released in 1986.

Overview

Balance of Power was the last studio album by the Electric Light Orchestra before their disbanding (the band would later reform in 2000). By this time Kelly Groucutt had departed and the group was pared down to a trio of Jeff Lynne, Richard Tandy, and Bev Bevan. Recording for the album began in 1984, with a planned release in spring 1985. The addition of several synthesizer tracks to the album caused its release to be pushed back to early 1986. ELO played some live concerts in the UK and Europe (their last for fifteen years), and for one UK show George Harrison performed as guest guitarist.

The video for the single "Calling America" was shot in Paris, and contains shots of the band playing in front of Centre Georges Pompidou. A video was also made for the single "So Serious." The track "Endless Lies" was intended as an homage to Roy Orbison, and was originally recorded for the never-released double LP version of Secret Messages; it reappeared on this album in a slightly reworked and more compact form. The album was ELO's first to not feature any strings, the first to feature a saxophone solo, and the first released on CD. The original release has the shortest running time of any ELO album.