Convection from an extended surface of constant cross section
AH = area of heated wall only
AC = summed area of all cylindrical pins
TCAV = average temperature along the length of the cylindrical pins which may be approximated as :
Experiment
Newton’s law of cooling
Fin efficiency
▣ 알루미나세라믹스 - Al2O3 ▣
Al2O3 특성
화성암 중의 평균 15% 함유
장석,운모 등과 같이 규산염의 형태로 고정되어 존재.
순수 Al2O3 광물 - 강옥
① Al2O3광물
Corumdum
무색, 투명한 순수 Al2O3 결정
루비; 미량의 Cr 고용으로 홍색
사파이어; 미량의 Co 고용으로 청색
triclinic구조를 갖으며, 판상과 주상으
백토(Clay) : 점토 광물 중 카올린 광물, 6각 판상의 카오리나이트가 코팅용으로 사용, 평활성, 광택 등의 발현
탄산칼슘(CaCo₃) : 석회석을 생석회로 소성해 물에 녹이고 탄산가스를 주입하여 탄산칼슘으로 재생, 주로 코팅용으로 사용 → 백색도, 불투명도, 잉크 수리성 등의 개선
구분
PCC
GCC
Clay
입자 형
PAN DOWN TO A ROW OF 몷TELLERS몶 CAGES몸 with long lines of PEOPLE waiting to collect their unemployment checks. A sign above the first window says 몷A - F몸, the second window is designated 몷G - L몸 and so on.
CLOSE ON THE SECOND WINDOW -- Waiting his turn at the head of the line is a BLACK MAN in his early 30몶s. He kills time by trying to make a beat-up old wooden yo-yo perform the ba
Science fiction plucks from within us our deepest fears and hopes then shows them to us in rough disguise: The monster and the rocket.
W.H. Auden
We live, as we dream - alone.
Joseph Conrad
"ALIEN"
FADE IN:
SOMETIME IN THE FUTURE:
INT. ENGINE ROOM
Empty, cavernous.
INT. ENGINE CUBICLE
Advantage of SET
1. I-V relation
2. Extra small size of application device
3. Very low driving voltage
4. Short switching time
5. Better sensing device
Vapor-liquid-solid growth
Direct Observation of Vapor-Liquid-Solid Nanowire Growth
(J. Am. Chem. Soc. 2001, 123, 3165-3166)
Template-based electrode
Au soucre & drain electrode using templating mechanism
Shadow mask eva
AVATAR
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?
THE SOUND OF DRUMSfrom a great distancegrowing louder.
FADE IN:
WE ARE FLYING through
Select the city - Kyunggido
It include the 27Cities 4county.
Surround the metropolis of Seoul and Incheon
because it surrounds the big cities such as seoul, incheon, we expect it generates a lot of domestic wastes. So we select kyunggido.
Comparing to the Seoul and Incheon, Kyunggido total house number is increasing.
→ Imply domestic waste increasing
High-Tech Textiles
1. Smart flame-resistant textile
1) 배경
IED(Improvised Explosive Deviced:급조폭발물)로 인한 사상자발생으로
화염방지의 필요성을 절감하였다.
2) Nomex®
듀퐁사에서 1960년대 초반에 개발한 Aromatic polyamid(aramid) fiber로 1967년부터 상업적으로 생산되기 시작. 지금은 화염방지 소재에 있어 하나의 명