Double tee

A double tee or double-T beam is a load-bearing structure that resembles two T-beams connected to each other side by side. The strong bond of the flange (horizontal section) and the two webs (vertical members, also known as stems) creates a structure that is capable of withstanding high loads while having a long span. The typical sizes of double tees are up to 15 feet (4.6 m) for flange width, up to 5 feet (1.5 m) for web depth, and up to 80 feet (24 m) or more for span length. Double tees are pre-manufactured from prestressed concrete which allows construction time to be shorten.

History

The first application long-span double tees was on a two-story office building in Winter Haven, Florida, designed and built in 1961 by Gene Leedy. Leedy experimented when building his architectural office by using structural elements of prestressed concrete and designing the new "double-tee" structural elements. In their early days, the applications of double tees were limited to multi-story car park structures and roof structures of buildings, but they have now been used in highway structures as well.

C data types

In the C programming language, data types are declarations for memory locations or variables that determine the characteristics of the data that may be stored and the methods (operations) of processing that are permitted involving them.

The C language provides basic arithmetic types, such as integer and real number types, and syntax to build array and compound types. Several header files in the C standard library contain definitions of support types, that have additional properties, such as providing storage with an exact size, independent of the implementation.

Basic types

The C language provides the four basic arithmetic type specifiers char, int, float and double, and the modifiers signed, unsigned, short and long. The following table lists the permissible combinations to specify a large set of storage size-specific declarations.

The actual size of integer types varies by implementation. The standard only requires size relations between the data types and minimum sizes for each data type:

Double-precision floating-point format

Double-precision floating-point format is a computer number format that occupies 8 bytes (64 bits) in computer memory and represents a wide, dynamic range of values by using a floating point.

Double-precision floating-point format usually refers to binary64, as specified by the IEEE 754 standard, not to the 64-bit decimal format decimal64.

IEEE 754 double-precision binary floating-point format: binary64

Double-precision binary floating-point is a commonly used format on PCs, due to its wider range over single-precision floating point, in spite of its performance and bandwidth cost. As with single-precision floating-point format, it lacks precision on integer numbers when compared with an integer format of the same size. It is commonly known simply as double. The IEEE 754 standard specifies a binary64 as having:

This gives 15–17 significant decimal digits precision. If a decimal string with at most 15 significant digits is converted to IEEE 754 double precision representation and then converted back to a string with the same number of significant digits, then the final string should match the original. If an IEEE 754 double precision is converted to a decimal string with at least 17 significant digits and then converted back to double, then the final number must match the original.

The Double (Gaelic games)

The Double is a term in Gaelic games that refers to a county winning the All-Ireland Senior Football Championship and the All-Ireland Senior Hurling Championship in the same year. Other major trophies won in combination in the same year at minor or under-21 levels are also often referred to as doubles. Similarly, the winning of the All-Ireland and the National League titles in the same year may also be referred to as the Double, albeit an inferior one.

The Double

Only two counties have achieved this rare distinction at Senior level, both on two separate occasions:

National League-All-Ireland double

This is a much more common double.

Near Doubles

A great many sides over the years have come close to winning the coveted senior double but narrowly failed to do so by losing one or both of the championships at the end of the season.

The full list of these teams:

Tee

A tee is a stand used to support a stationary ball so that the player can strike it, particularly in golf, tee ball, American football, and rugby.

Etymology

The word tee is derived from the Scottish Gaelic word tigh meaning house and is related to the 'house' (the coloured circles) in curling. This would make sense, as the first golf tees were within a circle of one golf club length round the hole. Nowadays, modern courses have separate, designated tee boxes for each hole. For example, the ninth hole of a course is played from the ninth tee to the ninth green, and similarly for the other holes.

Golf tee

In golf, a tee is normally used for the first stroke of each hole. The area from which this first stroke is hit is in the rules known as the teeing ground. Normally, teeing the ball is allowed only on the first shot of a hole, called the tee shot, and is illegal for any other shot; however, local or seasonal rules may allow or require teeing for other shots as well, e.g., under "winter rules" to protect the turf when it is unusually vulnerable. Teeing gives a considerable advantage for drive shots, so it is normally done whenever allowed. However, a player may elect to play his/her tee shot without a tee. This typically gives the shot a lower trajectory.

Tee (symbol)

The tee (⊤), also called down tack (as opposed to the up tack) or verum is a symbol used to represent:

Encoding

In Unicode, the tee character is encoded as U+22A4 ⊤ DOWN TACK (HTML ⊤). The symbol is encoded in LaTeX as \top.

See also

Notes