Gain
Gain may refer to:
Increase of quantity
People
Products
Music
Acronyms
Other uses
Gain (singer)
Ga-In (hangul: 가인) (born Son Ga-In (hangul: 손가인), September 20, 1987) is a South Korean singer, actress, and entertainer. She is best known as a member of the Korean pop music girl-group Brown Eyed Girls and for her appearances alongside Jo Kwon from 2AM for TV shows We Got Married and All My Love. As a solo artist she has released five EPs.
Music career
2005-09: Brown Eyed Girls & solo projects
Son Ga-In was noticed by the existing members of Brown Eyed Girls after she was eliminated during auditions for the popular South Korean reality series Let's Coke Play! Battle Shinhwa! She was approached by composer Ahn Jung Hoon and invited to audition at Brown Eyed Girls' company, eventually joining the group. The four members performed several small shows before officially debuting as Brown Eyed Girls in 2006. In the same year, she performed a duet "Must Have Love" with SG Wannabe's leader Kim Yong Jun, which became her first number one hit during the Christmas season.
Despite having initial successes, it was not until 2009 that her home group made a breakthrough into Korean mainstream with their hit song "Abracadabra", which was notable for the group's shift of their image and their new direction. After the unexpected success of the song, the group went on to become one of the most mentioned names of K-Pop girl-groups.
Gain (laser)
In laser physics, gain or amplification is a process where the medium transfers part of its energy to the emitted electromagnetic radiation, resulting in an increase in optical power. This is the basic principle of all lasers. Quantitatively, gain is a measure of the ability of a laser medium to increase optical power.
Definition
The gain can be defined as the derivative of logarithm of power 
as it passes through the medium:
where 
is the coordinate in the direction of propagation.
This equation neglects the effects of the transversal profile of beam.
In the quasi-monochromatic paraxial approximation, the gain can be taken into account with the following equation
where
is variation of index of refraction (Which is supposed to be small),
is complex field, related to the physical electric field
with relation
, where
is vector of polarization,
is wavenumber,
is frequency,
is transversal Laplacian;
means real part.
Gain in Quasi two-level system
In the simple quasi two-level system,
the gain can be expressed in terms of populations
and
of lower and excited states:
M80
M80 or M-80 may refer to:
M80
M-80
See also
Podcasts:
No Gain
by: AirlockHe tried to tell you it was over so many times
You kept convincing yourself that he would change his mind
You never thought that love could do this to you and him
You thought that it was supposed to be innocent
You gave him everything and more that you had to give
Three shining faces that will never fade
So tell me what it's like to be on his own again
He makes it look like it's easy but I've heard
That one before
No place for tears
You're giving him everything
All or nothing
No pain, no gain
Now you can chase your dreams
Chase your dreams
He? so we can tell him down the phone
You feel as if you loose a something that wants was yours (?)
No one could ever take away what belongs to you
If you don't want to choose the choice will be made for you
It doesn't matter what he decides to do
He's working? you'll have to find your way
If you don't? your life you gave it all away
No place for tears
You're giving him everything
All or nothing
No pain, no gain
Now you can chase your dreams
Chase your dreams
He lost you while he was trying to find himself
It's nothing new, I see it happening all the time
So tell me, tell me, has he found what he's looking for
He had the icing on the cake and he wants some more
I know it's not been easy making it on your own
Don't let it get you down, were here, you're not alone
You've got your girls, what love, they'll always be by your side
The grass has always been greener on the other side
No place for tears
You're giving him everything
All or nothing
No pain, no gain
Now you can chase your dreams
Chase your dreams
No place for tears
You're giving him everything
All or nothing
No pain, no gain
Now you can chase your dreams