the x-direction [M/s]
J=Diffusion flux across unit are at right angles to the x-direction [ mol/(s∙cm^2 )]
D=Diffusion constant [ cm^2/s]
여기서 – 부호는 흐름이 높은 농도에서 낮은 농도로 일어남을 나타내준다. 한편 위의 Fick’s Law 식을 보면 시간에 따른 농도의 변화는 없다는 것을 알 수 있다. 시간에 따라 농도가 변
Two Sources of body water gain
- internal production : Water produced from the oxidation of organic nutrients
- ingestion : water ingested in liquids and foods
Four sites that lose water
- skin, respiratory air ways, gastrointestinal tract, and urinary tract
- Menstrual flow (in women)
The body gains sodium and chloride by ingestion and loses them via the skin (in sweat
At the equivalence point:mole of H+ = mole of OH-(Molarity of NaOH)*(Volume of NaOH used)=(Molarity of unknown)*(Volume of unknown)
PH = 7 at equivalent point
① Add 5 drops of the indicator solution(BTB) to the unknown solution.
② Rinse the buret at least 3 times with a few mL of the 0.1M NaOH standard solution .
③ Fill the buret with the 0.1M NaOH solution and be sure to elimi
the graphite anode from expanding by lithium ion intercalation
Si has theoretical capacity of 4200mAh/g
Due to it’s large volume change, pulverization can be occurred.
Silicon has high-capacity but poor cycle stability
Carbon has low-capacity but good cycle stability
So silicon/carbon composites can have higher capacity than single carbon anode,
and better cycle stabilit
Partial substitution of Ba by a smaller M2+ ion
unit cell volume decreases and the phase transition temperature decreases
An insulator at room temperature becomes semiconductive after doping
trivalent donars (e.g. La, Sb, Y) substitute for the Ba2+
pentavalent donars (e.g. Sb, Nb, Ta) substitute for Ti4+.
와인 보관 창고
적정온도 : 7-13도
더 낮은