Friday, August 8, 2008
Radiocarbon method
Willard Labby (NP 1986) developed radiocarbon dating in 1947. This method is based on presence of radioactive carbon 14C in the atmosphere, which is produced by cosmic rays. Cosmic rays mainly consist of high-energy protons and alpha particles. Cosmic rays interacting with certain nuclei produce thermal neutrons, which in tern react with 14N and produce 14C.14C is radioactive and decays to 14N with a half-life of 5715uears. The two processes are in equilibrium and the ratio of the concentration of the two carbon isotopes in the atmosphere remains constant at about one 14C atom per 1000000000000 atoms of 12C. As a result, each gram of carbon has an activity of about 12 decays per minute. 14C atoms found in the atmosphere are oxidized to Carbon dioxide and absorbed by plants through photosynthesis and eventually get in to all living matter. When the living matter is dead, no new 14C are added and the concentration of 14C in dead matter decreases with time due to the decay of 14C. By determining decay rate of 14C in a biological sample, its age can be computed. For example if a sample has an activity of 6 decays per minute per gram of carbon, then the original activity has been reduced by half, and the sample must be one half life old.
read more | digg story
read more | digg story
Monday, July 14, 2008
Age of empire- cheat

Do you like to play strategic games? Then, I think you played that. Here I have some cheats for the game. If you like, you can play the game with the cheats. That is fantastic.
PEANUTBUTTER 1,000,000 food, wood, gold, and stone,
BIGDADDY coolest Cart with Rocket launcher
BIG BERTHA Catapult has range of 16 and area effect diameter of 10
FLYING DUTCHMAN Juggernaught can move on land
HOYOHOYO gives Priest speed of 6 and 600 hit points
ICBM Ballista has range of 100
NO FOG turns off Fog of War
REVEAL MAP reveals entire map
STEROIDS turns on quick build
HARI KARI destroys all of your buildings and units
HOME RUN gives you instant victory in a scenario
DIEDIEDIE everyone (including you) dies
RESIGN you resign
REVEAL MAP reveals the entire map
PEPPERONI PIZZA gives you 1,000 foods
COINAGE gives you 1,000 gold
WOODSTOCK gives you 1,000 woods
QUARRY gives you 1,000 stone
MEDUSA All People are Medusa
PHOTON MAN You become a Fighter with Laser anon
GAIA Control the Animals
KILLX kill Player in Position X (1-8)
DARK RAIN all composite bowmen become stealth archers
JACK BE NIMLE catapults fire out cows and villagers
killercroc buildings are built fast
BLACK RIDER creates a new unit
VICTORY Go to next level
I think now you can easily finish the age of empire game.
Sunday, July 13, 2008
Cheats- Tomb Raider

Hey did you play the Tomb Raider game. That is the wonderful game in my play list. This is the adventure game and created according to the “Tomb Raider” film. Therefore, I have some chats for this game. You can use those things while you are playing this game.
# ALL GUN- While playing walk forward once [hold shift and press up], Then walk
Backwards once [hold shift and press down] hold
Right until she does a 1080, [3 turns] then do a back flip.
You will hear a click if you have done this code right.
# GAME TIP- To ride on a raptor or a t-rex at the lost valley, just
Shoot the dinosaur 2 times with your shotgun and turn
Around and do a back flip to ride on it (this cheat needs
A lot of practice to succeed so just be patient if it
doesn’t\'t work)
Just check those things and get some fun.
NFS Most Wanted Cheat

Hey are you addicting to computer games. Then you must play the NFS most wanted. That is the top class car game. Did you finish that? That is difficult to complete lass section of the game. You have to drive your car at least over ten minutes because of the cops. Hey, I have some chats for you. Try to use them for your game. However, try to play the game with out cheat. That is the real game experience.
# iammostwanted - unlocked cars
# givemethegto - release the GTO
# burgerking - unlocks burgerking challenge in the challenge series
# castro - unlocks a Ford GT with castrol decals
Use this cheat and be the Most Wanted
Saturday, July 12, 2008
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