## Diameter

In geometry , a **diameter** of a circle is any straight line segment that passes through the center of the circle and whose endpoints are on the circle. The diameters are the longest chords of the circle. The word **diameter** " derives from Greek διάμετρος ( diametros ), "diagonal

**wikipedia.org**| 2011/9/13 15:38:13

## Beam diameter

The beam **diameter** or beam width of an electromagnetic beam is the **diameter** along any specified line that is perpendicular to the beam axis and intersects it. Since beams typically do not have sharp edges, the **diameter** can be obtained in many different ways. Five definitions of the beam

**wikipedia.org**| 2010/9/26 6:13:08

## Hydraulic diameter

The hydraulic **diameter** , D H , is a commonly used term when handling flow in noncircular tubes and channels. Using this term one can calculate many things in the same way as for a round tube. Definition: where A is the cross sectional area and P is the wetted perimeter of the cross

**wikipedia.org**| 2010/9/25 5:58:28

## Aerodynamic diameter

Aerodynamic **diameter** is commonly applied to particulate pollutants and inhaled drugs to predict where in the respiratory tract such particles will deposit. Drug particles for pulmonary delivery are typically characterized by aerodynamic **diameter** rather than geometric **diameter** . The velocity

**wikipedia.org**| 2011/3/15 5:25:27

## Tactical diameter

The tactical **diameter** of a ship is the distance: travelled on sea surface during a turning circle test with maximum rudder angle by the center of gravity of a ship taken perpendicular to the initial track followed at approach speed when the heading has changed by 180° The ratio

**wikipedia.org**| 2011/4/30 16:26:29

## Major diameter

Major **diameter** From Wikipedia, the free encyclopedia Jump to: navigation , search Wikipedia does not have an encyclopedia article for Major **diameter** ( search results ) . You may want to read Wiktionary 's entry on " Major **diameter** " instead. Please do not replace this message

**wikipedia.org**| 2010/9/25 11:57:52

## Diameter (protocol)

The name is a pun on the RADIUS protocol, which is the predecessor (a **diameter** is twice the radius). **Diameter** is not directly backwards compatible , but provides an upgrade path for RADIUS. The main differences are as follows: Reliable transport protocols ( TCP or SCTP , not UDP ) Network

**wikipedia.org**| 2011/9/4 18:08:14