Change of conductivity being
normal state and gas detecting in sno2 grain boundary
Amount of desorption and absorption of oxide and free electron
can control sensor sensitivity
Electrode and the electrolyte solution while maintaining a constant current from the direct oxidation and reduction when measuring current to detect the gas.
Cause ionization of the electrolyte solution, the
Title
Space Shuttle Alkaline Fuel Cell Power Plant
Description
Supplied to NASA by UTC Fuel Cells, three of these
12kW systems provide auxiliary power and drinking
water in each spacecraft in the space shuttle fleet.
Title
1970 Alkaline Fuel Cell Vehicle, based on Austin A40
Description
View of alkaline fuel cell stacks in the boot. Built by Dr.
type
Advantage: do not need air sealing & formed on strong support ->mechanical property is great & resistance from heat is great
Disadvantage: power density is small
Economical characteristic
Do not use expansive catalyst
Do not need reforming
Do not need electrolyte supplement
Price is cheaper than others
Technical characteristic
simple process caused by various fuels
Conjugated organic semiconductors
Expansion or contraction of the polymers by mobile solvated ions
Applied to several microsystems and actuated catheters, circulation pumps, etc.
Low level charge injection Quantum mechanical effects dominate
High level charge injection Coulomb forces dominate
Repulsive force between same charges
Discharging process
wh
Dialysis
What is dialysis?
Dialysis is a membrane process where solutes (MW~<100 Da) diffuse from one side of the membrane (feed side) to the other (dialysate or permeate side) according to their concentration gradient. First application in the 70’s.
General Principles
Separation between solutes is obtained as a result of differences in diffusion rates.
These are arising from differe
Integrated coal Gasification Combined Cycle (IGCC) power plant is the most environmentally friendly coal-fired power generation technology. Most importantly, coal gasification offers the immediate opportunity to generate power with near zero greenhouse gas emissions and the pathway to a future hydrogen economy.
Description
Coal gasification is the process of converting coal to a gaseous f
미래의 에너지문제와 환경문제를 극복할 수 있는 재생에너지원으로써 태양전지는 시간이 갈수록 중요성을 더해가고 있다. 현재까지 개발된 여러 종류의 태양전지 중 실리콘을 이용하는 태양전지는 25%까지 도달하는 효율과 제조공정의 확보 등으로 가장 널리 사용되고 있지만, 고가장비가 사용되고,
1. 서 론
1.1 LED의 등장과 필요성
1879년 미국의 T.A. 에디슨에 의해 백열전구의 상업적 양산이 시작된 이래 전기를 이용한 조명의 개발은 매년 발전에 발전을 거듭해 왔다. 1920년대 말엔 과학자들에 의해 실험실에서 사용되던 형광등이 상업적으로 생산-판매되면서 널리 보급되기 시작했고, 그 이래 지
type( 이것은 중앙 8면체의 금속 클러스터에 의해 특징지워진다.- 다시 말하면, M6X8 여기서 M은 높은 원자가 전이 금속이고 X는 S나 Se, Te같은 산소족 원소이다.) 물질에 근거한 칼코겐의 이원 화합물(chalcogenide compounds)를 사용하는 것이다. 이런 금속들은 불활성 기체와 낮은 온도 조건에서, 금속-카르보닐