나노복합재료연구실 ( Nano Composite Research Lab.)
1. Purpose of this study
■ Measurement of Young's modulus using sonic resonant test
■ Measurement of Young's modulus using beam bending test
2. Introduction
Young's modulus is one of the important materials properties that is related with the bonding force between atoms or ions in materials. That will give a cle
vibrates through the cabin.
The boys eyes snap open.
Jacob glances around nervously. He looks like an escaped
convict who just accidentally walked into the Policemens
Ball. A GREYHAIRED MAN two seats away from him gives the
teenager a cursory glance, then goes back to his book. Jacob
lays his head back and tries to relax. The engines continue
to drone.
Until a new noise starts. A WHOOSHING N
vibration :1012 to 1013s-1
The probability for light emission is at most 109s-1.
At finite temperature, the electron state oscillates around the
equilibrium position along the configurational coordinate curve
up to the thermal energy of kT.
At relatively high temperature, a nonradiative relaxation process
the transition probability per unit time, N :
By letting W by the l
sonic boom, impacts the sub, slamming it sideways.
INT. U.S.S. MONTANA 6
The bride crew are knocked off their feet, as the ship is buffeted.
EXEC
Turbulence! Were in its wake!
SIRENS. Everyone shouting at once. The power flickers low.
CAPTAIN
Helm, all stop! Full right rudder!
HELMSMAN
All stop. Full right rudder. Hydraulic failure.
Planes are not responding, sir!
Power returns in time for the so
3. Experimental tools
1) Ultrasonic detector
It is widespread use of equipment that used in ultra sonic testing. And it also have lots of control function.
2) probe
A protected face transducer is a single element longitudinal wave contact transducer that can be used with either a delay line, protective membrane, or protective wear cap.
3) couplant A couplantis a material (usually liq