PKA
PKA may refer to:
Acid dissociation constant
An acid dissociation constant, Ka, (also known as acidity constant, or acid-ionization constant) is a quantitative measure of the strength of an acid in solution. It is the equilibrium constant for a chemical reaction known as dissociation in the context of acid-base reactions. In aqueous solution, the equilibrium of acid dissociation can be written symbolically as:
where HA is a generic acid that dissociates into A−, known as the conjugate base of the acid and a hydrogen ion which combines with a water molecule to make an hydronium ion. In the example shown in the figure, HA represents acetic acid, and A− represents the acetate ion, the conjugate base.
The chemical species HA, A− and H3O+ are said to be in equilibrium when their concentrations do not change with the passing of time. The dissociation constant is usually written as a quotient of the equilibrium concentrations (in mol/L), denoted by [HA], [A−] and [H3O+]
In all but the most concentrated aqueous solutions of an acid the concentration of water can be taken as constant and can be ignored. The definition can then be written more simply
PKA (irradiation)
A Primary Knock-on Atom or PKA is an atom that is displaced from its lattice site by irradiation; it is, by definition, the first atom that an incident particle encounters in the target. After it is displaced from its initial lattice site, the PKA can induce the subsequent lattice site displacements of other atoms if it possesses sufficient energy, or come to rest in the lattice at an interstitial site if it does not.
Most of the displaced atoms resulting from electron irradiation and some other types of irradiation are PKAs, since these are usually below the threshold displacement energy and do not have sufficient energy to displace more atoms. In other cases like fast neutron irradiation, most of the displacements result from higher energy PKAs colliding with other atoms as they slow down to rest.
Collision Models
Atoms can only be displaced if, upon bombardment, the energy they receive exceeds a threshold energy Ed. Likewise, when a moving atom collides with a stationary atom, both atoms will have energy greater than Ed after the collision only if the original moving atom had an energy exceeding 2Ed. Thus, only PKAs with an energy greater than 2Ed can continue to displace more atoms and increase the total number of displaced atoms. In cases where the PKA does have sufficient energy to displace further atoms, the same truth holds for any subsequently displaced atom.
Podcasts:
PKA
ALBUMS
- Floor Fillers - Warehouse Party released: 2013
- GU Mixed Unmixed DJ Version released: 2007
- Global Underground: GU Mixed released: 2007
- GU10: The Unmixed Version released: 2006
- Global Underground 10 released: 2006
- The House Collection: Club Classics released: 1996
- DJ Culture released: 1993
- DJ Culture: The Stress Compilation released: 1993
- Mr Music Hits 1992-2 released: 1992
- Max Mix 11 released: 1991
- Techno Dance Party released: 1991
- DJ Culture: Mixe Par DJ Tom Bouthier released:
Floor Fillers - Warehouse Party
Released 2013- Can You Party
- The Party
- Let Me Love You for Tonight
- The Power
- Rich in Paradise (Going Back to My Roots) (original mix)
- Voodoo Ray
- Right Before My Eyes (House vocal mix)
- Let It Roll
- The Real Wild House
- Ride on Time
- Helyom Halib
- Don’t Miss the Party Line
- Dream On (Is This a Dream) (High Resolution mix)
- Mr. Kirk’s Nightmare
- Fools Gold
- Snappiness
- Your Love
Global Underground: GU Mixed
Released 2007- An Evening With Bobi Bros
- Dibiza (Island Groove remix)
- Lovin (Your Body remix) (feat. Jay Leblone)
- SheShi Lounging
- The Operatah
- Another Man (Daniel Stefanik mix)
- Harmonize
- Magical
- Superflyin (Francesco Farfa mix)
- Twelve (Noir remix)
- Music From the Heart
- Genesis
- Mal Funktion
- Shake It (Philipe De Boyar remix) (feat. Vanessa)
- Manga
- Razorblade (Play Paul club mix)
- Witchi Tai To (M Factor vocal)
- Waiting For You (Superbass remix)
- Burn My Shadow (Junkie XL remix)
Global Underground 10
Released 2006- Break My World
- Everytime (Nalin and Kane remix)
- Sacred (dub mix)
- Give Me Luv (That Kid Chris Tribute mix)
- Sputnik (New York FM mix)
- Perception
- Stage One (Pariah mix) / Stage One (Total Separation mix)
- The Roots
- Reality Detached (K Roxx '06 Seperation mix)
- Frank Sinatra
- Overactive
- Voices (Pete Heller mix)
- Sacred Cycles (Jens Mahlstedt mix) / Sacred Cycles (Quivver mix) / Sacred Cycles (original mix)
- Leaving Planet Earth (GUX 2006 re-edit)
- Turn Me On (John Digweed & Nick Muir's Bedrock mix)
- I Dream (Tilt's Resurrection mix) / I Dream (Casa de Angeles mix)
- Theme From Wide Angle
The House Collection: Club Classics
Released 1996- Soul Roots (original mix)
- From the DAT Vol. 1 (Ultra Flava mix)
- Son Of Wilmot (original mix)
- Hideaway (Deep Dish mix)
- Higher State of Consciousness (Tweekin Acid Funk mix)
- Stoneage (original mix)
- Let the Music Lift You Up (full on vocal mix)
- Hey Mr DJ (Stab mix)
- Mooncat (Bonesys Hand & Spear mix)
- Cry India (Ark Anthem mix)
- Play This House (Aquarius Teased & Pleased mix)
- Horny as Funk (Hard as Phunk mix)
- Peace and Joy (original mix)
- Funk and Drive (Non Stop Floor edit)
DJ Culture
Released 1993- Can't Play Around (The Big Bump mix)
- The Mighty Ming (Brothers In Rhythm club mix)
- For What You Dream Of... (instrumental edit)
- Nasty Rhythm (Sasha's M.F.I. mix)
- Call Him Up (Slam mix)
- ...Happen (Tolley's Stressed mix)
- One (SSL full mix)
- You Can't Stop The Groove (Mensa mix)
- Give It All To Me (Level Best mix)
- Let Me Hear You Say Yeah (Phil Kelsey's '93 remix)
- Last Rhythm (Sure Is Pure remix)
DJ Culture: The Stress Compilation
Released 1993- For What You Dream Of (Full on Renaissance mix) (feat. Kya)
- Last Rhythm (original club mix)
- ... Happen (Tolley's Stressed mix)
- Ming's Incredible Disco Machine (Playboys Fully Loaded mix) / Ming's Incredible Disco Machine (Bigger and Badder Ming mix)
- Can't Play Around (The Good Boy mix)
- The Mighty Ming (Brothers in Rhythm club mix)
- Call Him Up (Brothers in Rhythm remix)
- The Mighty Ming (Sure Is Pure remix) / Juice - Do It Right (Funkin' for Italia mix)
- One (Bivouac mix)
- Give It All to Me (original 12" mix)
- Let Me Hear You Say Yeah (Phil Kelseys's '93 remix)
- Musika (The Bivouac mix)
- You Can't Stop the Groove (Suck My Clav mix)
- Ming's Incredible Disco Mashine (E-Lustrious mix)
- Boom Pow! (Greed mix #1)
Techno Dance Party
Released 1991- Pleasure Game
- Modular Expansion
- Brazil
- Factory
- Rubb It In
- Okay! Alright!
- Traffic
- Atomic Playboy
- Energy Flash
- Bolero
- Technarchy
- Inner Light
- Anasthasia
- Are You Ready to Move
- Everybody
- We Need Freedom
- Let Me Hear You (Say Yeah)
- Night in Motion
- Playing With Knives
- Praise God
- Flesh And Blood
- James Brown Is Dead
DJ Culture: Mixe Par DJ Tom Bouthier
- Nasty Rhythm (Sasha's MFI Mix)
- Happen (Tolley's Stressed mix)
- Crazy Bass (original mix)
- Temperature Rising
- Love Is ... (Spirit of 67 mix)
- Give It All to Me (Level Best mix)
- Can't Play Around (Big Bump mix)
- The Chant (Remix)
- You Can't Stop the Groove (Mensa mix)
- Mings Incredible Disco Machine (Bigger & BadderMing Mix)
- Boom Pow (Telecaster mix)
- Call Him Up (Slam mix)
PKA
ALBUMS
- Octopus One released: 2004
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A Crooked Nigga Too (Raphael Saadiq Remix)
by: 2PacYo 'Pac yo, I heard you got beat up by the police
Got a big fat lawsuit and everything
Niggaz just wanna know
if you still gon' be on some crooked-ass sheeeit
[2Pac]
Please tell me what's a nigga to do, and it's true
Ain't nuttin new, so I do, what I can to get through
Now first they had me trapped and now I'm pissed
A loaded AK-47 lay under my head so I don't trip
One motherfucker from the Underground
And Big Stretch buckin niggaz if they fuck around
Yo why I got beef with police?
Ain't that a bitch that motherfuckers got a beef with me
They make it hard for me to sleep
I wake up at the slightest peep, and my sheets are 3 feet deep
I guess it's hard for you to see
But now I'm pointin the finger at police
instead of them motherfuckers blamin me
I got the right to bear a pistol
And when the punk motherfuckers get to trippin I got shit too
And maybe then you'll see the truth (hell yeah)
But until then, I gotta do what I do
and stay a crooked nigga too
[Chorus: Raphael Saadiq]
I've got to do, what I'm gon' do
I'm gon' say what I'm gon' say
I'm gon' live how I live - how else you want a nigga to live?
I'm gon' do, what I do
I'm gon' say, what I say
I'm gon' live how I live - how do you want a nigga to live?
[2Pac]
Y'know you really can't say that ya blame niggaz
Fuck bein tame, set aflame, time to aim triggers
2Pac'll spark a revolution, fuck the Constitution
I want my bucks for restitution
This time you got a bigger problem
Time to face the niggaz from South Central, Oakland, Brooklyn and Harlem
And we ain't shootin at each other
That's my motherfuckin brother, so Dave Duke, run for cover
And all the bitches from the Klan
Come feel the wrath of a black man that doesn't smoke crack and
I don't drink St. Ides (fuck that!)
Genuine Draft, ganja ganja, and my fuckin tec-9
They know they scared to see us sober
Stop drinkin King Cobra, and niggaz'll take the world over
It's all up to you (up to you)
Blame the Korean, blame the jew, or be a crooked nigga too
[Chorus]
[2Pac]
Aiyyo! Why me? Play like Jasmine Guy and try me
I'll be damned if I die, come look at the rage in my eyes G
They got my homies in a jail cell
And it's the Rebel and the Devil, and one of us is goin to Hell
I got the whole place covered, with loc'd out brothers
And nuttin but love for each other
So motherfucker make a motion
I give a fuck, slice you up, and throw your ass in the ocean
Temperatures drop; see it's cool to shoot a nigga
but they hate it when we pop the cops
That's when they gettin petrol
You better watch your step or you'll be left on death row
But I learn to look ahead of me
Stay strapped watch your back keep your eyes on the enemy
We blowin up precincts and OOOH
You can't fuck with the crew, of crooked nigga too
[Chorus]
[Raphael Saadiq]
It's the coldest town from here to Georgia
(I'm a crooked nigga too)
It's the coldest town from here to Georgia
It's the coldest town from here to Georgia
(I'm a crooked.. crooked nigga too)
It's the coldest town from here to Georgia
Y'all gon' stop fuckin with me
[Chorus - repeat to fade]
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