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
소리와 소리의 특성
■ 소리란?
-진동에 의해 생성
-압력파(pressure waves)의 형태로 공기를 매질로 하여 전달
■ 음향물리학: 주파수, 강도, 스펙트럼
■ 심리음향학: 음의 고저, 소리의 크기, 음질, 음원 찾기 능력
1. 소 리 (Sound)
심리학적 의미: 청각적 경험
물리학적 의미: 탄성체 내의 일련의 분자 운동
제 2 장 소리와 소리의 특성
▶ 소리의 특성에 대한 필요성
▶ 소리란?
- 진동에 의해 생성되고, 압력파(pressure waves)의 형태로 공기를 매질로 하여 우리에게 전달
음향물리학(acoustic-physics): 주파수, 강도, 스팩트럼
심리음향학(psychoacousics): 음의 고저, 소리의 크기, 음질, 음원 찾기 능력
1. 소 리 (Sound)
소
1. 침강
(1) 입자에 영향을 미치는 원인으로는 부력, 마찰저항, 중력이다.
부력은 쉽게 말하면 물에 뜨려는 힘을 말하는 것으로 크기는 유체 속에 있는 물체의 부피와 같은 부피를 가진 유체의 무게와 같으며, 부력의 작용점은 물체가 밀어낸 부분에 유체가 있다고 가정했을 때의 무게중심과 일치한다. 이
Silent and endless. The stars shine like the love of God... cold and remote. Against them drifts a tiny chip of technology.
CLOSER SHOT
It is the NARCISSUS, lifeboat of the ill-fated star-freighter Nostromo. Without interior or running lights it seems devoid of life. The PING of a RANGING RADAR grows louder, closer. A shadow engulfs the Narcissus. Searchlights flash on, playing over the tiny ship
SUPERMAN LIVES
??
Written by
Kevin Smith
??
??
EXT. SPACE
An Alien craft floats through the void, approaching a slow-moving
ASTEROID.
INT. ALIEN CRAFT
Two humanoid ALIENS dressed in uniforms pilot their craft nearer
to the asteroid.
ALIEN #1
Receiving a signal from an alien system,
but theres interference on the channels.
ALIEN #2
Once we get past this asteroid, it should
clear up.
Suddenly, THRO