Phi Gamma Delta

Phi Gamma Delta (also known as FIJI and Phi Gam) is a social fraternity with more than 142 active chapters and 13 colonies across the United States and Canada. It was founded at Jefferson College, Pennsylvania, in 1848. Along with Phi Kappa Psi, Phi Gamma Delta forms a half of the Jefferson Duo. Since its founding in 1848, the fraternity has initiated more than 170,000 brothers. The nickname FIJI is used commonly by the fraternity due to Phi Gamma Delta bylaws that limit the use of the Greek letters.

Founding

The organization was founded on April 22, 1848, at Jefferson College in Canonsburg, Pennsylvania. Six college students gathered in a dormitory room (known by the students as "Fort Armstrong") to establish a secret society. The society they formed was initially called "The Delta Association". The founders, referred to by members as the "Immortal Six", were John Templeton McCarty, Samuel Beatty Wilson, James Elliott Jr., Ellis Bailey Gregg, Daniel Webster Crofts, and Naaman Fletcher.

DA

Da, DA, dA and other variants may refer to:

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Organizations

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Day

A day is a unit of time. In common usage, it is an interval equal to 24 hours. It also can mean the consecutive period of time during which the Sun is above the horizon, also known as daytime. The period of time during which the Earth completes one rotation with respect to the Sun is called a solar day.

Several definitions of this universal human concept are used according to context, need and convenience. In 1967, the second was redefined in terms of the wavelength of light, and was designated the SI base unit of time. The unit of measurement "day", redefined in 1967 as 86 400 SI seconds and symbolized d, is not an SI unit, but is accepted for use with SI. A civil day is usually also 86 400 seconds, plus or minus a possible leap second in Coordinated Universal Time (UTC), and, in some locations, occasionally plus or minus an hour when changing from or to daylight saving time. The word day may also refer to a day of the week or to a calendar date, as in answer to the question "On which day?" The life patterns of humans and many other species are related to Earth's solar day and the day-night cycle (see circadian rhythms).

11D428

The 11D428A-16 (manufacturer's name RDMT-135M) is a liquid pressure-fed rocket engine burning N₂O₄/UDMH with an O/F of 1.85. It is used for crew-rated spacecraft propulsion applications. It is currently used in the KTDU-80 spacecraft propulsion module. The previous version, the 11D428A (manufacturer's name RDMT-135) is still used as the reaction control system thrusters of the Zvezda ISS module. The 11D428A-16 generates 129.16 N (29.04 lbf) of thrust with a chamber pressure of 0.88 MPa (128 psi) and achieves a specific impulse of 291 s (2.85 km/s). It is rated for 500,000 starts with a certified ignition time of 0.03 seconds to 2000 seconds. Each unit weights 1.5 kg (3.3 lb).

Versions

This engine has been used with certain variations in manned Russian space program since the Salyut 6 in Soviet times. The three main versions are: